The document presents a mathematical modeling and analysis of the influence of process parameters on material removal rate (MRR) during electrical discharge machining (EDM) of stainless steel 304. Experiments were conducted to determine the effects of peak current, pulse on time, and pulse off time on MRR. Using Taguchi methods, an optimal combination of parameters was identified to achieve maximum MRR. Analysis of variance confirmed the significant effects of the parameters on MRR. Regression analysis was then used to develop a second order full quadratic mathematical model relating MRR to the process parameters. The model was found to have acceptable accuracy in predicting response values based on its R2 and adjusted R2 values. Interaction effects between the parameters were also studied.
Parametric optimization for cutting speed β a statistical regression modeling...IAEME Publication
Β
This document presents an experimental study to optimize cutting speed in wire electrical discharge machining (WEDM) of EN-31 alloy steel. Experiments were conducted using a L27 orthogonal array to investigate the effects of eight machining parameters (pulse on time, pulse off time, peak current, spark gap voltage, wire feed rate, wire tension, servo feed, and dielectric flushing pressure) on cutting speed. Analysis of variance was used to determine the most significant parameters, and the optimal levels for maximizing cutting speed were found to be pulse on time at 128 ΞΌs, pulse off time at 53 ΞΌs, peak current at 230 A, spark gap voltage at 20 V, wire feed rate at 4 m/min, wire tension at
Optimization of Electrical Discharge Machining Process Parameters using SCM42...IOSRJMCE
Β
This document summarizes research that used response surface methodology to optimize the electrical discharge machining (EDM) process parameters when machining SCM420 low alloy steel. The researchers investigated the effects of peak current, pulse on time, and gap voltage on material removal rate (MRR) and surface roughness (Ra). They conducted experiments according to a central composite design and analyzed the results to develop mathematical models relating the process parameters to the output responses. The analysis found that peak current had the greatest influence on both MRR and Ra, with MRR increasing and Ra decreasing at higher peak current levels. Optimal values for the process parameters to achieve high MRR and low Ra were determined to be a peak current of 22 amps, pulse
The document summarizes research on controlling tool wear during electrical discharge machining (EDM). It discusses how tool wear reduces accuracy by diminishing feature sharpness and increases costs. The research aims to identify factors influencing the rate of tool wear and optimize parameters like current and pulse time to minimize wear of copper electrodes. It reviews past studies on improving material removal rate and reducing tool wear rate through techniques like using powder metallurgy to create copper-tungsten electrodes and implementing Taguchi methods for optimization. The presented research will experimentally validate solutions for controlling tool wear during EDM of copper electrodes.
This document presents a study comparing laser cutting and plasma cutting of mild steel E350 material. The study aims to select the best cutting technology and investigate the effects of process parameters on output responses. Laser power, cutting speed, and gas pressure were varied as input parameters, while surface roughness, kerf, taper, and heat affected zone were measured as output responses. Experiments were conducted according to a Taguchi L27 design of experiments. Analysis of variance found that all input parameters significantly affected the output responses. Laser cutting produced lower surface roughness and taper compared to plasma cutting for the material. Optimal parameters for laser cutting of mild steel were identified.
Parametric Optimization of Electrochemical Machining Using Signal-To-Noise (S...IJMER
Β
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessmentβ¦. And many more.
Optimization of edm process parameters using taguchi method a revieweSAT Journals
Β
Abstract
Electrical discharge machining is assessed on the basis of Material Removal Rate (MRR), Tool Wear Rate (TWR), and Surface Roughness (SR). Process parameters that mostly affected the EDM Process are Pulse on Time, Pulse off Time, Discharge Current, Arc Gap and Duty Cycle. This paper reviews research for the optimization and improvement of various performance parameters measured in the experimentation on EDM by using Taguchi technique. In the study the main objectives of optimization is to minimize the tool wear rate (TWR) and surface roughness, and to maximize the material removal rate (MRR).Taguchi Method is widely used in the industry to optimize and improve various performance parameters associated with different machining processes. This paper also deals with the review of some of the work reported with the use of Taguchi method in last two decades.
Keywords: - EDM, Wire EDM, MRR, RWR, TWR, SR, Taguchi Technique
Optimization of WEDM Process Parameters on Titanium Alloy Using Taguchi MethodIJMER
Β
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessmentβ¦. And many more.
Wire EDM Parameters for Surface Roughness in Straight Gear Manufacturing: An ...Dr. Amarjeet Singh
Β
The gears are an essential component of any system. A gear is a spinning circular machine part with cut teeth, or inserted teeth (called cogs) in the case of a cogwheel or gearwheel, which mesh with another toothed part to convey torque. A gear is sometimes referred as a cog colloquially. Geared devices can adjust a power source's speed, torque, and direction. To eliminate backlash, high precision is required while making gears. Wire cut EDM is a high-precision machining technology that may manufacture high-precision straight gear. The goal of this research is to use the WEDM Process on an EMS 45 to determine the surface roughness of the workpiece and to optimise the influence of current and wire speed on the surface roughness of the straight gear. Wire cut machining parameters employed were 4, 6, and 8 amperes of current and 9, 11, and 13 mm/min of wire speed. Wire has a diameter of 0.25 mm, and the cutting material is brass. It has been demonstrated that as current and wire speed increase, surface roughness decreases, and vice versa. As a result, reduced machine settings can be used to generate a smoother and better workpiece surface.
Parametric optimization for cutting speed β a statistical regression modeling...IAEME Publication
Β
This document presents an experimental study to optimize cutting speed in wire electrical discharge machining (WEDM) of EN-31 alloy steel. Experiments were conducted using a L27 orthogonal array to investigate the effects of eight machining parameters (pulse on time, pulse off time, peak current, spark gap voltage, wire feed rate, wire tension, servo feed, and dielectric flushing pressure) on cutting speed. Analysis of variance was used to determine the most significant parameters, and the optimal levels for maximizing cutting speed were found to be pulse on time at 128 ΞΌs, pulse off time at 53 ΞΌs, peak current at 230 A, spark gap voltage at 20 V, wire feed rate at 4 m/min, wire tension at
Optimization of Electrical Discharge Machining Process Parameters using SCM42...IOSRJMCE
Β
This document summarizes research that used response surface methodology to optimize the electrical discharge machining (EDM) process parameters when machining SCM420 low alloy steel. The researchers investigated the effects of peak current, pulse on time, and gap voltage on material removal rate (MRR) and surface roughness (Ra). They conducted experiments according to a central composite design and analyzed the results to develop mathematical models relating the process parameters to the output responses. The analysis found that peak current had the greatest influence on both MRR and Ra, with MRR increasing and Ra decreasing at higher peak current levels. Optimal values for the process parameters to achieve high MRR and low Ra were determined to be a peak current of 22 amps, pulse
The document summarizes research on controlling tool wear during electrical discharge machining (EDM). It discusses how tool wear reduces accuracy by diminishing feature sharpness and increases costs. The research aims to identify factors influencing the rate of tool wear and optimize parameters like current and pulse time to minimize wear of copper electrodes. It reviews past studies on improving material removal rate and reducing tool wear rate through techniques like using powder metallurgy to create copper-tungsten electrodes and implementing Taguchi methods for optimization. The presented research will experimentally validate solutions for controlling tool wear during EDM of copper electrodes.
This document presents a study comparing laser cutting and plasma cutting of mild steel E350 material. The study aims to select the best cutting technology and investigate the effects of process parameters on output responses. Laser power, cutting speed, and gas pressure were varied as input parameters, while surface roughness, kerf, taper, and heat affected zone were measured as output responses. Experiments were conducted according to a Taguchi L27 design of experiments. Analysis of variance found that all input parameters significantly affected the output responses. Laser cutting produced lower surface roughness and taper compared to plasma cutting for the material. Optimal parameters for laser cutting of mild steel were identified.
Parametric Optimization of Electrochemical Machining Using Signal-To-Noise (S...IJMER
Β
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessmentβ¦. And many more.
Optimization of edm process parameters using taguchi method a revieweSAT Journals
Β
Abstract
Electrical discharge machining is assessed on the basis of Material Removal Rate (MRR), Tool Wear Rate (TWR), and Surface Roughness (SR). Process parameters that mostly affected the EDM Process are Pulse on Time, Pulse off Time, Discharge Current, Arc Gap and Duty Cycle. This paper reviews research for the optimization and improvement of various performance parameters measured in the experimentation on EDM by using Taguchi technique. In the study the main objectives of optimization is to minimize the tool wear rate (TWR) and surface roughness, and to maximize the material removal rate (MRR).Taguchi Method is widely used in the industry to optimize and improve various performance parameters associated with different machining processes. This paper also deals with the review of some of the work reported with the use of Taguchi method in last two decades.
Keywords: - EDM, Wire EDM, MRR, RWR, TWR, SR, Taguchi Technique
Optimization of WEDM Process Parameters on Titanium Alloy Using Taguchi MethodIJMER
Β
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessmentβ¦. And many more.
Wire EDM Parameters for Surface Roughness in Straight Gear Manufacturing: An ...Dr. Amarjeet Singh
Β
The gears are an essential component of any system. A gear is a spinning circular machine part with cut teeth, or inserted teeth (called cogs) in the case of a cogwheel or gearwheel, which mesh with another toothed part to convey torque. A gear is sometimes referred as a cog colloquially. Geared devices can adjust a power source's speed, torque, and direction. To eliminate backlash, high precision is required while making gears. Wire cut EDM is a high-precision machining technology that may manufacture high-precision straight gear. The goal of this research is to use the WEDM Process on an EMS 45 to determine the surface roughness of the workpiece and to optimise the influence of current and wire speed on the surface roughness of the straight gear. Wire cut machining parameters employed were 4, 6, and 8 amperes of current and 9, 11, and 13 mm/min of wire speed. Wire has a diameter of 0.25 mm, and the cutting material is brass. It has been demonstrated that as current and wire speed increase, surface roughness decreases, and vice versa. As a result, reduced machine settings can be used to generate a smoother and better workpiece surface.
Optimization of the Process Parameters of Wire Cut EDM - A ReviewIJSRD
Β
The objective of this paper is to study the effect of different process parameter of wire electrical discharge machine (WEDM) process on the performance measures such as material removal rate (MRR), surface roughness, dimensional accuracy and kerf width. It is necessary to evaluate the factors that affect the productivity and efficiency of WEDM process. It will directly contribute to increase cutting speed and dimensional accuracy.
ANALYSIS AND STUDYTHE EFFECTSOFVARIOUS CONTROL FACTORS OF CNC-WIRE CUT EDMFOR...meijjournal
Β
Wire electrical discharge machining (WEDM) is a non conventional machining process which is widely used in machining of conductive materials.The applications of WEDM are in automobiles, aero-space, medical instruments, tool and die industries. in the present study analysis of effect of various control factors like Ton,Toff,Sv,Ip,Wf,Wt on checking the cutting rate of S7 steel is studied by using wire cut EDM and one factor time approach.S7 steels contain less carbon and higher toughness than the high carbon types that are more wear resistant. Shock resistant steels are used where heavy cutting or forming operations is required and chipping or breakage of high-carbon wear-resistant steels is a problem. The other big advantage of this study is to select the range of significant control factors for final experimentation.
A Literature Review on Effect of Machining Parameters in Wire - EDMijsrd.com
Β
The recent upgradation of newer and harder materials has made the machining task in WEDM quite challenging. Thus for the optimum use of all the resources it is essential to make the optimum use of parameters to get the best output to increase the productivity. Advances in technology have impacted with an increased cutting speed and tight tolerances in WEDM. This paper reviews the various notable works in field of WEDM and magnifies on effect of machining parameters on MRR, kerf width and surface roughness.
THE EFFECTS OF MACHINING PARAMETERS ON SURFACE ROUGHNESS OF MATERIAL EN-31 IN...ijiert bestjournal
Β
The paper represent the work done for making mathematical models fo r analysis of the effects of machining parameters on the performance characteristics in EDM process of Alloy steel (EN-31). The mathematical models are developed using the response surface methodology (RSM) to explai n the influences of machining parameters on the performance characteristics in the EDM process.
This document discusses using the Taguchi method to optimize WEDM parameters for machining EN 31 steel to achieve lower surface roughness. An experiment was conducted using an L9 orthogonal array to test different levels of pulse on time, pulse off time, gap voltage, and wire feed. Analysis of variance showed that pulse on time had the largest effect on surface roughness at 48.84%, followed by gap voltage at 36.81%. Confirmation experiments found that the optimized parameters of 4ΞΌs pulse on time, 6ΞΌs pulse off time, 40V gap voltage, and 4mm/min wire feed achieved a predicted surface roughness with only 11.5% error, validating the model. The Taguchi method was able to effectively optimize
Optimization of Surface Roughness for EN 1010 Low Alloy Steel on WEDM Using R...IJAEMSJORNAL
Β
This document describes research into optimizing the surface roughness of EN 1010 low alloy steel using wire electrical discharge machining (WEDM). Experiments were conducted using a central composite design to investigate the effects of four process parameters (pulse on time, pulse off time, peak current, and servo voltage) on surface roughness. Analysis of variance was used to identify significant parameters and develop a mathematical model relating the parameters to surface roughness. The model achieved a good fit to the data and can be used to determine the optimal parameter settings that minimize surface roughness.
The document describes a study that developed an artificial neural network (ANN) model to predict surface roughness, cutting force, and temperature during machining of Nimonic-75 and Nicrofer C-263 super alloys. Experiments were conducted to collect input/output data on cutting speed, feed rate, depth of cut, surface roughness, cutting force, and temperature. The ANN model was trained on this data and could accurately model the complex relationships between cutting conditions and output parameters for process analysis and optimization.
The entire research work is experiment oriented and the conclusions are drawn based on
graphical analysis of experimental results. The research work carried out reveals that the findings are
encouraging in establishing the effect of Voltage, Capacitance and work piece vibration Frequency,
amplitude on different materials Β΅EDM drilling process performance characteristics. The results of
this investigations can be adopted in deciding the optimal values of input process parameters Β΅EDM
drilling process
Optimization of electrical discharge machiningrakigeo01
Β
This document summarizes a study that used the Taguchi method to optimize the electrical discharge machining (EDM) process for machining tungsten carbide composite. The researchers investigated how EDM process parameters affected material removal rate, electrode wear ratio, and microcrack density on the surface. They conducted experiments using an orthogonal array design from Taguchi methods. Analysis of variance was used to determine the most influential parameters and their optimal levels to maximize material removal rate while minimizing electrode wear ratio and microcrack density.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
Β
call for paper 2012, hard copy of journal, research paper publishing, where to publish research paper,
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Review Article on Machining of Nickel-Based Super Alloys by Electric Discharg...sushil Choudhary
Β
Electric discharge machining (EDM) process generally used for burrs free, less metallurgical damage, stress free and very precise machining and produces mould cavity, deep holes, complex shapes & size by arc erosion in all types of electro-conductive materials. In this process, the metal is removed from the work piece due to erosion caused by rapidly recurring spark discharge taking place between the tool electrode and work-piece. Tool electrode and wok-piece both submersed into the dielectric fluid. The main aims of this review paper work is to present the consolidated information about the contribution of various researchers on the machining applications of electric discharge machining process on Nickel-Base Super alloys materials, utilization of various tool and techniques for correlating experiment results and applications of product through the EDM. Nickel-Base Super alloys materials is widely used for fuel tanks, aircraft & rocket engine components, nuclear fuel element spacers, casings, fasteners, rings, seal, measuring instrument, cryogenic storage tanks and automobile components etc.
Multiple Optimization of Wire EDM Machining Parameters Using Grey Based Taguc...IJMER
Β
Wire EDM is a non conventional machining process, which is used when the precision is prime importance. Multiple optimization (Grey based Taguchi) technique is used to find out the optimum machining setup for input parameter. This paper investigate the optimal set of process parameter such as Ton, Toff, Wp, Wf in wire EDM machining process to find out the variation in two output parameter such as material removal rate (MRR), and surface roughness (Ra) on material high chromium high carbon steel (HCHCr) using wire Brass/super alloy (coated).Experimentation was conducted on orthogonal array L-9 based on DOE. Analysis of experiment has been carried out using GRA. All the experimental data are fed into Minitab software, through which various tables, graphs & optimum values are obtained. The experimental result reveals that the optimum setting of input parameters significantly improves Wire EDM process.
Study of surface roughness for discontinuous ultrasonic vibration assisted el...eSAT Journals
Β
Abstract The objective of this paper is to study the effects of response parameters on the performance characteristics in the Ultrasonic vibration Assisted Electric Discharge Machining (UEDM) Process. Response Surface Methodology (RSM) is used to investigate the effect of amplitude of vibration, peak current, pulse on-time, machining time and flushing pressure. To study the proposed second order polynomial model for surface roughness (SR), a Central Composite Design (CCD) is used for the estimation of the model coefficients of five factors, which are believed to influence the SR in UEDM process. Experiments are conducted on Aluminum alloy 6063 with copper electrode. The response is modeled on experimental data by using RSM. The separable influence of individual machining parameters and the interaction between these parameters are also investigated by using analysis of variance (ANOVA). It is found that amplitude of vibration, peak current; pulse-on time, flushing pressure and most of their interactions have significant affect on SR. Keywords: Central Composite Design, SR, UEDM, RSM, Aluminum alloy (Al6063)
IRJET- Parametric Optimization of Powder Mixed Electronic Discharge Machine.IRJET Journal
Β
The document summarizes a study that optimized the process parameters of powder mixed electrical discharge machining (PMEDM) to maximize material removal rate and minimize tool wear rate and surface roughness. Key parameters investigated included peak current, pulse on time, and aluminum powder concentration. Experiments were designed using Taguchi methodology and analyzed in MINITAB 18 software. The results showed that peak current had the greatest influence on material removal rate, while aluminum powder concentration had the greatest influence on tool wear rate and surface roughness. Recommended optimal parameter settings were determined through confirmation experiments.
An Electrode Shape Configuration on the Performance of Die Sinking Electric D...IJERA Editor
Β
Electrical discharge machining (EDM) is one of the non-traditional machining processes, based on thermo electric energy
between the work piece and an electrode. In this process, the material removal is occurred electro thermally by a series of
successive discrete discharges between electrode and the work piece. The parametric analysis of the EDM process by using
different electrode shapes has been carried out. This Research discusses the performance of die sinking EDM due to the
shape configuration of the electrode. The effect of electrode shapes configuration on the performance of die sinking electric
discharge machine has been carried out. The optimization of the parameters of the EDM machining has been carried out by
using the taguchiβs method for design of experiments (DOE). In this research we have used taguchiβs method for design of
experiments with three input parameters and their three levels of experiments. The dielectric used is kerosene diluted with
water. The objective of the analysis is to optimize the process parameters of EDM with the help of taguchi method and using
Minitab software.
This paper discuss of literature review of EDM and ANNOVA Technology used in on CNC. Today CNC technology has major contribution in i ndustries. CNC machines are main platform in the contribution of good quality products in industries. Basically CNC machines are automated operating machines which are based on code letters,numbers and special characters. The numerical data required for manufacturin g a part provided by machine is called CNC (Computer Numerical Controlled). To remain successful in todayοΏ½s competitive market,the manufacturers should rely on their Engineer s and production professionals for quick and effective manufacturing setup and also to achie ve Quality products. The machining process on a CNC Milling is programmed by speed,feed rate,and cutting depth,which are frequently determined based on the job s hop experiences However,the machine performance and the product characteristics are not guaranteed to be acceptable.
Parameter Optimization of Wire EDM in a Range of Thickness for EN8 Die SteelIJTET Journal
Β
Wire Electrical Discharge Machining (WEDM) is also known as an electro thermal production process in then, nor
electricity) allows the wire to cut through the metal by the use of heat from electrical sparks. The present work process approach
to parameter optimization in wire electric discharge machining of EN-8 die steel (of thickness 50 and 75mm) using Taguchi
method which optimizes four process parameters (factors) such as pulse ON time, pulse OFF time, current, voltage and two
important response such as material removal rate (MRR) and in surface roughness (Ra βaverage roughness) of machined
workpiece is considered in this study. Taguchi is an efficient search technique, is used to obtain the optimal setting of the desired
responses and to avoid the conflicting nature of response. Taguchi designs focus on reducing variability, as well as setting the mean to target.
IRJET- Effects of Process Parameters in Wire Cut EDM on Material Removal Rate...IRJET Journal
Β
This document summarizes a study that investigated the effects of process parameters in wire cut electrical discharge machining (WEDM) on the material removal rate of aluminum composite materials. Experiments were conducted varying parameters like pulse on time, pulse off time, servo voltage, and wire speed. It was found that material removal rate increased with increasing pulse on time and decreased with increasing pulse off time and servo voltage. The optimal set of parameters to maximize material removal rate was also determined.
1) The document investigates the effect of polarized signals on the performance of adaptive antenna arrays with uniformly spaced elements. It compares the performance of arrays with single dipole elements versus cross-dipole elements.
2) Simulation results show that when the polarization of the desired signal is unknown, cross-dipole arrays perform better than single dipole arrays. However, if the polarization of the desired signal is known, single dipole arrays give better performance.
3) The paper defines parameters to characterize the polarization of incoming signals, including ellipticity angle, orientation angle, and electric field components. It describes how the signal received at each antenna element depends on these polarization parameters.
This document summarizes a study on retrofitting an existing reinforced concrete (R.C.) building using different non-destructive testing (NDT) methods. The study assessed the condition of the existing structure using NDTs like ultrasonic pulse velocity testing and Schmidt rebound hammer testing. The results from these tests showed the concrete quality was medium to doubtful. The study then proposes to strengthen and retrofit the structural elements like columns using reinforced concrete jacketing to allow for additional loads from a three-story building extension. The retrofitted structure is then designed to meet the required load carrying capacity.
This document describes the design of a three-layer knowledgebase for expert systems. The three layers are:
1) The logical/design layer, which processes input text to extract clauses, functional symbols, and predicate symbols.
2) The knowledge layer, which represents the extracted knowledge using techniques like first-order logic, frames, and description logic.
3) The storage layer, which stores the represented knowledge in an object-relational database for retrieval and use by the expert system.
The document provides details on each layer and discusses how the input text is processed in the logical layer before being represented and stored in the knowledge and storage layers, respectively.
This document discusses the implementation of instantaneous reactive power theory (IRP theory) for current harmonic reduction and reactive power compensation in three phase four wire power systems. IRP theory is used to calculate reference compensating currents that are injected by a shunt active power filter (SAPF) to compensate for non-linear and reactive loads. Clarke's transformation is used to convert voltages and currents to the Ξ±-Ξ²-0 reference frame for IRP calculations. Hysteresis current control with a constant switching frequency is used to generate PWM signals to control the SAPF inverter. Simulations show the SAPF reducing current harmonics and reactive power, improving the power factor by making the source current sinusoidal and in phase with
Optimization of the Process Parameters of Wire Cut EDM - A ReviewIJSRD
Β
The objective of this paper is to study the effect of different process parameter of wire electrical discharge machine (WEDM) process on the performance measures such as material removal rate (MRR), surface roughness, dimensional accuracy and kerf width. It is necessary to evaluate the factors that affect the productivity and efficiency of WEDM process. It will directly contribute to increase cutting speed and dimensional accuracy.
ANALYSIS AND STUDYTHE EFFECTSOFVARIOUS CONTROL FACTORS OF CNC-WIRE CUT EDMFOR...meijjournal
Β
Wire electrical discharge machining (WEDM) is a non conventional machining process which is widely used in machining of conductive materials.The applications of WEDM are in automobiles, aero-space, medical instruments, tool and die industries. in the present study analysis of effect of various control factors like Ton,Toff,Sv,Ip,Wf,Wt on checking the cutting rate of S7 steel is studied by using wire cut EDM and one factor time approach.S7 steels contain less carbon and higher toughness than the high carbon types that are more wear resistant. Shock resistant steels are used where heavy cutting or forming operations is required and chipping or breakage of high-carbon wear-resistant steels is a problem. The other big advantage of this study is to select the range of significant control factors for final experimentation.
A Literature Review on Effect of Machining Parameters in Wire - EDMijsrd.com
Β
The recent upgradation of newer and harder materials has made the machining task in WEDM quite challenging. Thus for the optimum use of all the resources it is essential to make the optimum use of parameters to get the best output to increase the productivity. Advances in technology have impacted with an increased cutting speed and tight tolerances in WEDM. This paper reviews the various notable works in field of WEDM and magnifies on effect of machining parameters on MRR, kerf width and surface roughness.
THE EFFECTS OF MACHINING PARAMETERS ON SURFACE ROUGHNESS OF MATERIAL EN-31 IN...ijiert bestjournal
Β
The paper represent the work done for making mathematical models fo r analysis of the effects of machining parameters on the performance characteristics in EDM process of Alloy steel (EN-31). The mathematical models are developed using the response surface methodology (RSM) to explai n the influences of machining parameters on the performance characteristics in the EDM process.
This document discusses using the Taguchi method to optimize WEDM parameters for machining EN 31 steel to achieve lower surface roughness. An experiment was conducted using an L9 orthogonal array to test different levels of pulse on time, pulse off time, gap voltage, and wire feed. Analysis of variance showed that pulse on time had the largest effect on surface roughness at 48.84%, followed by gap voltage at 36.81%. Confirmation experiments found that the optimized parameters of 4ΞΌs pulse on time, 6ΞΌs pulse off time, 40V gap voltage, and 4mm/min wire feed achieved a predicted surface roughness with only 11.5% error, validating the model. The Taguchi method was able to effectively optimize
Optimization of Surface Roughness for EN 1010 Low Alloy Steel on WEDM Using R...IJAEMSJORNAL
Β
This document describes research into optimizing the surface roughness of EN 1010 low alloy steel using wire electrical discharge machining (WEDM). Experiments were conducted using a central composite design to investigate the effects of four process parameters (pulse on time, pulse off time, peak current, and servo voltage) on surface roughness. Analysis of variance was used to identify significant parameters and develop a mathematical model relating the parameters to surface roughness. The model achieved a good fit to the data and can be used to determine the optimal parameter settings that minimize surface roughness.
The document describes a study that developed an artificial neural network (ANN) model to predict surface roughness, cutting force, and temperature during machining of Nimonic-75 and Nicrofer C-263 super alloys. Experiments were conducted to collect input/output data on cutting speed, feed rate, depth of cut, surface roughness, cutting force, and temperature. The ANN model was trained on this data and could accurately model the complex relationships between cutting conditions and output parameters for process analysis and optimization.
The entire research work is experiment oriented and the conclusions are drawn based on
graphical analysis of experimental results. The research work carried out reveals that the findings are
encouraging in establishing the effect of Voltage, Capacitance and work piece vibration Frequency,
amplitude on different materials Β΅EDM drilling process performance characteristics. The results of
this investigations can be adopted in deciding the optimal values of input process parameters Β΅EDM
drilling process
Optimization of electrical discharge machiningrakigeo01
Β
This document summarizes a study that used the Taguchi method to optimize the electrical discharge machining (EDM) process for machining tungsten carbide composite. The researchers investigated how EDM process parameters affected material removal rate, electrode wear ratio, and microcrack density on the surface. They conducted experiments using an orthogonal array design from Taguchi methods. Analysis of variance was used to determine the most influential parameters and their optimal levels to maximize material removal rate while minimizing electrode wear ratio and microcrack density.
International Journal of Engineering Research and Development (IJERD)IJERD Editor
Β
call for paper 2012, hard copy of journal, research paper publishing, where to publish research paper,
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Review Article on Machining of Nickel-Based Super Alloys by Electric Discharg...sushil Choudhary
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Electric discharge machining (EDM) process generally used for burrs free, less metallurgical damage, stress free and very precise machining and produces mould cavity, deep holes, complex shapes & size by arc erosion in all types of electro-conductive materials. In this process, the metal is removed from the work piece due to erosion caused by rapidly recurring spark discharge taking place between the tool electrode and work-piece. Tool electrode and wok-piece both submersed into the dielectric fluid. The main aims of this review paper work is to present the consolidated information about the contribution of various researchers on the machining applications of electric discharge machining process on Nickel-Base Super alloys materials, utilization of various tool and techniques for correlating experiment results and applications of product through the EDM. Nickel-Base Super alloys materials is widely used for fuel tanks, aircraft & rocket engine components, nuclear fuel element spacers, casings, fasteners, rings, seal, measuring instrument, cryogenic storage tanks and automobile components etc.
Multiple Optimization of Wire EDM Machining Parameters Using Grey Based Taguc...IJMER
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Wire EDM is a non conventional machining process, which is used when the precision is prime importance. Multiple optimization (Grey based Taguchi) technique is used to find out the optimum machining setup for input parameter. This paper investigate the optimal set of process parameter such as Ton, Toff, Wp, Wf in wire EDM machining process to find out the variation in two output parameter such as material removal rate (MRR), and surface roughness (Ra) on material high chromium high carbon steel (HCHCr) using wire Brass/super alloy (coated).Experimentation was conducted on orthogonal array L-9 based on DOE. Analysis of experiment has been carried out using GRA. All the experimental data are fed into Minitab software, through which various tables, graphs & optimum values are obtained. The experimental result reveals that the optimum setting of input parameters significantly improves Wire EDM process.
Study of surface roughness for discontinuous ultrasonic vibration assisted el...eSAT Journals
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Abstract The objective of this paper is to study the effects of response parameters on the performance characteristics in the Ultrasonic vibration Assisted Electric Discharge Machining (UEDM) Process. Response Surface Methodology (RSM) is used to investigate the effect of amplitude of vibration, peak current, pulse on-time, machining time and flushing pressure. To study the proposed second order polynomial model for surface roughness (SR), a Central Composite Design (CCD) is used for the estimation of the model coefficients of five factors, which are believed to influence the SR in UEDM process. Experiments are conducted on Aluminum alloy 6063 with copper electrode. The response is modeled on experimental data by using RSM. The separable influence of individual machining parameters and the interaction between these parameters are also investigated by using analysis of variance (ANOVA). It is found that amplitude of vibration, peak current; pulse-on time, flushing pressure and most of their interactions have significant affect on SR. Keywords: Central Composite Design, SR, UEDM, RSM, Aluminum alloy (Al6063)
IRJET- Parametric Optimization of Powder Mixed Electronic Discharge Machine.IRJET Journal
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The document summarizes a study that optimized the process parameters of powder mixed electrical discharge machining (PMEDM) to maximize material removal rate and minimize tool wear rate and surface roughness. Key parameters investigated included peak current, pulse on time, and aluminum powder concentration. Experiments were designed using Taguchi methodology and analyzed in MINITAB 18 software. The results showed that peak current had the greatest influence on material removal rate, while aluminum powder concentration had the greatest influence on tool wear rate and surface roughness. Recommended optimal parameter settings were determined through confirmation experiments.
An Electrode Shape Configuration on the Performance of Die Sinking Electric D...IJERA Editor
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Electrical discharge machining (EDM) is one of the non-traditional machining processes, based on thermo electric energy
between the work piece and an electrode. In this process, the material removal is occurred electro thermally by a series of
successive discrete discharges between electrode and the work piece. The parametric analysis of the EDM process by using
different electrode shapes has been carried out. This Research discusses the performance of die sinking EDM due to the
shape configuration of the electrode. The effect of electrode shapes configuration on the performance of die sinking electric
discharge machine has been carried out. The optimization of the parameters of the EDM machining has been carried out by
using the taguchiβs method for design of experiments (DOE). In this research we have used taguchiβs method for design of
experiments with three input parameters and their three levels of experiments. The dielectric used is kerosene diluted with
water. The objective of the analysis is to optimize the process parameters of EDM with the help of taguchi method and using
Minitab software.
This paper discuss of literature review of EDM and ANNOVA Technology used in on CNC. Today CNC technology has major contribution in i ndustries. CNC machines are main platform in the contribution of good quality products in industries. Basically CNC machines are automated operating machines which are based on code letters,numbers and special characters. The numerical data required for manufacturin g a part provided by machine is called CNC (Computer Numerical Controlled). To remain successful in todayοΏ½s competitive market,the manufacturers should rely on their Engineer s and production professionals for quick and effective manufacturing setup and also to achie ve Quality products. The machining process on a CNC Milling is programmed by speed,feed rate,and cutting depth,which are frequently determined based on the job s hop experiences However,the machine performance and the product characteristics are not guaranteed to be acceptable.
Parameter Optimization of Wire EDM in a Range of Thickness for EN8 Die SteelIJTET Journal
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Wire Electrical Discharge Machining (WEDM) is also known as an electro thermal production process in then, nor
electricity) allows the wire to cut through the metal by the use of heat from electrical sparks. The present work process approach
to parameter optimization in wire electric discharge machining of EN-8 die steel (of thickness 50 and 75mm) using Taguchi
method which optimizes four process parameters (factors) such as pulse ON time, pulse OFF time, current, voltage and two
important response such as material removal rate (MRR) and in surface roughness (Ra βaverage roughness) of machined
workpiece is considered in this study. Taguchi is an efficient search technique, is used to obtain the optimal setting of the desired
responses and to avoid the conflicting nature of response. Taguchi designs focus on reducing variability, as well as setting the mean to target.
IRJET- Effects of Process Parameters in Wire Cut EDM on Material Removal Rate...IRJET Journal
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This document summarizes a study that investigated the effects of process parameters in wire cut electrical discharge machining (WEDM) on the material removal rate of aluminum composite materials. Experiments were conducted varying parameters like pulse on time, pulse off time, servo voltage, and wire speed. It was found that material removal rate increased with increasing pulse on time and decreased with increasing pulse off time and servo voltage. The optimal set of parameters to maximize material removal rate was also determined.
1) The document investigates the effect of polarized signals on the performance of adaptive antenna arrays with uniformly spaced elements. It compares the performance of arrays with single dipole elements versus cross-dipole elements.
2) Simulation results show that when the polarization of the desired signal is unknown, cross-dipole arrays perform better than single dipole arrays. However, if the polarization of the desired signal is known, single dipole arrays give better performance.
3) The paper defines parameters to characterize the polarization of incoming signals, including ellipticity angle, orientation angle, and electric field components. It describes how the signal received at each antenna element depends on these polarization parameters.
This document summarizes a study on retrofitting an existing reinforced concrete (R.C.) building using different non-destructive testing (NDT) methods. The study assessed the condition of the existing structure using NDTs like ultrasonic pulse velocity testing and Schmidt rebound hammer testing. The results from these tests showed the concrete quality was medium to doubtful. The study then proposes to strengthen and retrofit the structural elements like columns using reinforced concrete jacketing to allow for additional loads from a three-story building extension. The retrofitted structure is then designed to meet the required load carrying capacity.
This document describes the design of a three-layer knowledgebase for expert systems. The three layers are:
1) The logical/design layer, which processes input text to extract clauses, functional symbols, and predicate symbols.
2) The knowledge layer, which represents the extracted knowledge using techniques like first-order logic, frames, and description logic.
3) The storage layer, which stores the represented knowledge in an object-relational database for retrieval and use by the expert system.
The document provides details on each layer and discusses how the input text is processed in the logical layer before being represented and stored in the knowledge and storage layers, respectively.
This document discusses the implementation of instantaneous reactive power theory (IRP theory) for current harmonic reduction and reactive power compensation in three phase four wire power systems. IRP theory is used to calculate reference compensating currents that are injected by a shunt active power filter (SAPF) to compensate for non-linear and reactive loads. Clarke's transformation is used to convert voltages and currents to the Ξ±-Ξ²-0 reference frame for IRP calculations. Hysteresis current control with a constant switching frequency is used to generate PWM signals to control the SAPF inverter. Simulations show the SAPF reducing current harmonics and reactive power, improving the power factor by making the source current sinusoidal and in phase with
This document discusses using a Distributed Power Flow Controller (DPFC) to improve the voltage profile of a transmission system and mitigate power quality issues like voltage sags and swells. It first introduces the concepts of voltage sags, swells, and power quality in transmission systems. It then proposes using a DPFC, which consists of STATCOM shunt controllers and multiple SSSC series controllers, to regulate voltage. Two control methods for the DPFC are analyzed: 1) PI control and 2) Fuzzy Logic control. Simulation results in MATLAB/Simulink show that the DPFC is able to improve the voltage profile at the load bus compared to without using a DPFC. Fuzzy Logic control is proposed to further enhance
Analysis of Stress Distribution in a Curved Structure Using Photoelastic and ...IOSR Journals
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1) The document analyzes stress distribution in a curved structure subjected to uniaxial tension using photoelastic and finite element methods.
2) Photoelasticity is used to experimentally determine stress distribution in models of the curved structure with and without circular and elliptical stress relievers. Finite element analysis is then used to validate the experimental photoelastic results.
3) The study found that an elliptical stress reliever with its major axis normal to the load more effectively reduced stress concentration at the inner boundary of the curved structure compared to a circular stress reliever.
Large Span Lattice Frame Industrial Roof StructureIOSR Journals
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This document summarizes the design of a large span lattice frame roof structure for an industrial building in India. Key points include:
- The structure is a 60m span by 100m length roof for a coal storage shed.
- Various structural systems were analyzed using STAAD software to determine the most economical design.
- Load combinations considered dead load, live load, and wind loads according to Indian standards.
- Preliminary member sizing was conducted using a unit loading method, with the governing load combination being 10kN total at nodes from dead and live loads.
- Results of the analysis showed minimum moments and shears occurred for a roof slope between 7-9 degrees and a
The document provides an overview of the Intel 8085 microprocessor, including:
1) The Intel 8085 is an 8-bit microprocessor introduced in 1977 that was faster and required fewer external components than its predecessor, the 8080.
2) It has eight 8-bit registers (Accumulator, B, C, D, E, H, L, and Program Status Word) and can address up to 64KB of memory.
3) It performs arithmetic and logical operations using an Arithmetic Logic Unit and is controlled by a timing and control unit that decodes instructions and generates control signals.
4) It has interrupt capabilities and can perform serial input/output. The 8085 had many applications due to its versatility
FEA Simulation for Vibration Control of Shaft System by Magnetic Piezoelectri...IOSR Journals
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1) The document describes a finite element analysis simulation of a shaft system to evaluate the effectiveness of magnetic piezoelectric control mounts for vibration damping.
2) The shaft is 200mm long, rotates at 700rpm, and is subjected to a hammer load of 220N. Modal and harmonic analyses are conducted with and without control mounts.
3) The results show that with control mounts, natural frequencies are reduced to 2-9Hz from 2000-9000Hz, deformation is reduced by 60%, amplitude is reduced by 98%, and vibration is damped by 99%, demonstrating the control mounts are an effective vibration damping method.
Effect of Different Levels of Cadmium, Lead and Arsenic on the Growth Perform...IOSR Journals
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This document summarizes a study on the effects of different levels of cadmium, lead, and arsenic on the growth performance of broiler and layer chickens. Sixteen one-day-old chicks were fed feeds mixed with 0ppm, 10ppm, 20ppm, or 30ppm of the heavy metals. Results showed heavy metal accumulation in organs increased with concentration. Body weights decreased remarkably as metal concentrations increased, with 30ppm chickens weighing 820-1100g versus 1800-2350g for 0ppm at 56 days. Feed intake also decreased with higher metal levels. The study concludes that increasing heavy metal concentrations in poultry feed can retard growth rates and body weights.
Solid Waste Generation from Construction of Office Building with Special Refe...IOSR Journals
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This document summarizes a study on solid waste generation from the construction of office buildings for Nepal Telecom in Nepal. The study examined four construction sites in Kathmandu, Kaski, and Rupandehi districts. It found that the main types of construction waste generated were bricks, reinforcement bars, concrete, wood, and that the main causes of waste were poor planning, faulty procurement practices, lack of control and communication, and inefficient workmanship. The document analyzes the waste generation at each site and identifies the primary reasons for waste as work delays, material waste, rework, inefficient workmanship, and material deterioration due to improper storage and handling. It concludes that poor planning, coordination, and management were the overarching
This document proposes an enhanced adaptive data hiding technique in the discrete wavelet transform (DWT) domain. It begins with background information on DWT and quantization techniques like uniform and adaptive quantization. It then describes how data can be embedded in the non-zero DWT coefficients after adaptive quantization. Specifically, it embeds secret data by modifying the quantized DWT coefficients in a way that minimizes distortion to maintain good visual quality of the cover image. The goal is to improve data hiding capacity while preserving the quality of the cover image as measured by metrics like peak signal-to-noise ratio (PSNR) and the human visual system (HVS).
This document provides an overview of image steganography techniques. It discusses how steganography can be used to hide secret information in digital images in order to provide secure transmission of data. The document first defines steganography and cryptography. It then describes the Least Significant Bit (LSB) substitution technique, which is a common steganography method that replaces the LSB of image pixel values with bits of secret data. The document outlines the proposed system for embedding and extracting secret messages from an image using LSB substitution. It presents the procedures for encryption by hiding a file within an image and decryption by extracting the hidden file. The document discusses security, invisibility and robustness as important considerations for steganography techniques.
This document summarizes an automated method for detecting microaneurysms, hard exudates, and cotton wool spots in retinal fundus images. 130 retinal images were used from a public database to train and evaluate classifiers. Features were extracted from pre-processed images and candidate lesions were classified using support vector machines and k-nearest neighbors algorithms. The proposed method achieved 95.6% sensitivity, 94.87% specificity, and 95.38% accuracy in detecting lesions, outperforming random sampling. Active learning was shown to select more informative training samples than random sampling, improving classifier performance.
This document discusses the development of context-centered mobile applications. It defines context and explains that context-centered applications use contextual information to provide relevant information and services to users. The document then discusses factors that influence mobile application development, such as computing platforms, user context, security, and infrastructure. It also covers core technologies used in development, including communication technologies, development platforms, and positioning techniques. Finally, the document presents a framework for separating core application logic from adaptive functionality to build applications that can adapt to changing context.
Application of Roller Burnishing Process for Final Machining Of Cilindrical S...IOSR Journals
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This document discusses the roller burnishing process for final machining of cylindrical surfaces. Roller burnishing is an economical process that improves surface roughness and induces compressive residual stresses in the surface layer through plastic deformation. It can achieve a roughness of less than 0.1 mm and hardness increases of up to 10 HRC. The process results in a smoothed surface with no chips or coolant waste. It can be performed on standard machine tools and provides advantages over other finishing processes such as reduced cycle times, cleaner production, and improved part integrity and fatigue resistance through compressive residual stresses.
This document summarizes a study that tested reinforced concrete beam-column connections under cyclic loading to evaluate their seismic performance. A 1/3 scale beam-column specimen was designed and constructed based on analysis of a 4-story building frame. The specimen was tested under reversed cyclic loading with increasing displacements up to failure while monitoring response through instruments. Cracks initially formed in flexure and progressed to shear cracks. Analysis of load-displacement hysteresis loops provided information on ductility, energy dissipation, strength degradation, and stiffness degradation to evaluate the seismic performance of the connection.
The document describes the design and construction of an enhanced solar battery charger. The charger uses a current limited voltage regulator to safely charge batteries from 4V to 12V while limiting heat build-up. It incorporates a heat sink, rotary switch to select voltages, and an LED indicator. Experimental testing showed the charger could fully charge an empty mobile phone battery and drained lamp between 10am-4pm using only solar power. The low-cost, easy to build design was found to successfully bridge power gaps in remote areas lacking electricity.
This document summarizes the testing of a microcontroller-based solar panel tracking system developed by students in India. The system uses light dependent resistors and a microcontroller to track the sun and keep the solar panel perpendicular to maximize energy collection. Testing found the tracking system increased battery charging efficiency by around 32% compared to a stationary panel. The tracking system allows more solar energy to be harnessed and could help address energy needs, though further research and development is still needed to improve renewable energy technologies.
This document analyzes the aerodynamic performance of blended winglets on aircraft wings through computational fluid dynamics modeling. It finds that winglets can increase the lift to drag ratio of wings by 6-15% compared to wings without winglets. The maximum efficiency occurs at a winglet cant angle of 45 degrees and an angle of attack of 4 degrees. CFD simulations are validated against experimental data and show good agreement on lift coefficient values. Winglets improve efficiency by reducing wingtip vortices and increasing effective aspect ratio without adding structural weight.
Optimization of EDM Process Parameters using Response Surface Methodology for...ijtsrd
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The present work demonstrates the optimization process of material removal rate MRR of electrical discharge machining EDM by RSM Response Surface Methodology . The work piece material was EN31 tool steel. The pulse on time, pulse off time, pulse current and voltage were the control parameters of EDM. RSM method was used to design the experiment using rotatable central composite design as this is the most widely used experimental design for modeling a secondΓ’β¬βorder response surface. The process has been successfully modeled using response surface methodology RSM and model adequacy checking is also carried out using Minitab software. The second order response models have been validated with analysis of variance. Finally, an attempt has been made to estimate the optimum machining conditions to produce the best possible responses within the experimental constraints. Dr. N. Mahesh Kumar | Mr. P. Chinna Rao ""Optimization of EDM Process Parameters using Response Surface Methodology for AISI D3 Steel"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23535.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/23535/optimization-of-edm-process-parameters-using-response-surface-methodology-for-aisi-d3-steel/dr-n-mahesh-kumar
An Experimental Investigation of Material Removal Rate on H-13 Die Tool Steel...Dr. Amarjeet Singh
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H-13 is die tool steel, it have widely applications in the Hot punches and dies for blanking, bending, swaging and forging, Hot extrusion dies for aluminum, cores, ejector pins, inserts, Nozzles for aluminum, tin and lead die casting, Hot shear blades etc. as the H-13 steel has widely applications so it is chosen for the present study. Presents works shows the effect of various process parameters like peak current, Pulse on Time and Feed rate on Material Removal Rate. EDM Drilling and Taguchi technique is used for the optimization of response variables.
Optimizing Process Parameters on SR and MRR of Steel by EDMIRJET Journal
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This document summarizes an experiment that optimized process parameters for electric discharge machining (EDM) of steel to improve material removal rate (MRR) and surface roughness (SR). Stainless steel 316 samples were machined using a copper electrode. A pilot study tested different levels of discharge current, pulse on-time, pulse off-time, and dielectric pressure. Graphs showed that MRR increased with higher current due to increased spark intensity and melting/vaporization, while SR also increased with higher current. MRR decreased with longer pulse on-time due to a wider plasma channel. Based on the pilot study, a Taguchi L18 design of experiments was used to further test current, pulse on-time,
Gray Relational Basedanalysis of Tool SteelIRJET Journal
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This document presents research on optimizing the electro discharge machining (EDM) process for tool steel using Taguchi methods and grey relational analysis. The researchers conducted experiments with tool steel as the workpiece material and copper as the electrode. Response variables included material removal rate (MRR) and surface roughness (Ra). Taguchi methods were used to design the experiments and orthogonal arrays. Grey relational analysis was then used to analyze the multiple responses and determine the optimal process parameters. The analysis involved normalizing the experimental data, calculating grey relational coefficients and grades, and analyzing the results using ANOVA to select parameters that maximize MRR and minimize Ra.
CHARACTERIZATION OF WIRE ELECTRIC DISCHARGE MACHINING OF AISI 1040 STEELJournal For Research
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1) The document analyzes the effect of process parameters like pulse on time, pulse off time, wire feed, and current on material removal rate, machining speed, and machining time during wire electric discharge machining (WEDM) of AISI 1040 steel.
2) It finds that material removal rate increases with increasing pulse on time, wire feed, and current, and decreases with increasing pulse off time. Machining speed increases and machining time decreases with higher material removal rate.
3) The study contributes to understanding how WEDM process parameters influence machining performance for AISI 1040 steel, which is important for automotive and other industries.
IRJET-Experimental Analysis Optimization of Process Parameters of Wire EDM on...IRJET Journal
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This document analyzes the optimization of process parameters for wire electrical discharge machining (WEDM) of stainless steel 316L. It conducts experiments using different controllable factors like discharge current, pulse on/off time, and arc gap. Taguchi design of experiments is used to optimize for maximum material removal rate. Experiments are conducted using a copper tool on 316L stainless steel workpieces. The results are analyzed to determine the optimum parameter levels for achieving higher material removal rate and better surface finish quality during WEDM of 316L stainless steel.
MULTI OBJECTIVE OPTIMIZATION OF NEAR-DRY EDM PROCESS USING RESPONSE SURFACE M...IAEME Publication
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The correct selection of manufacturing technique is one of the most important aspects to take into consideration in the majority of manufacturing processes and particularly in processes related to Electrical Discharge Machining (EDM). It is capable of machining geometrically complex or hard
material components, which are precise and difficult-to-machine such as heat treated tool steels, composites, super alloys, ceramics, carbides, heat resistant steels etc. being widely used in die and mold making industries, aerospace, aeronautics and nuclear industries.
Anaysis of Material Removal Rate of AISI 304 SS In EDM Processijsrd.com
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EDM has become an important and cost-effective method of machining extremely tough and brittle electrically conductive materials. It is widely used in the process of making moulds and dies and sections of complex geometry and intricate shapes. The work piece material selected in this experiment is AISI 304 Stainless steel taking into account its wide usage in industrial applications. In todayΓΒ’Γ’β¬ÒβΒ’s world 304 stainless steel contributes to almost half of the worldΓΒ’Γ’β¬ÒβΒ’s production and consumption for industrial purposes. The input variable parameters are current, pulse on time and duty cycle. Taguchi method is applied to create an L27 orthogonal array of input variables using the Design of Experiments (DOE). The effect of the variable parameters mentioned above upon machining characteristics such as Material Removal Rate (MRR), Surface Roughness (SR) and Overcut (OC) is studied and investigated. The tool material is copper. The results obtained showed that current was the most significant parameter followed by pulse on time and the least significant was the duty cycle for the entire three responses namely Material removal rate, Surface roughness and overcut. With the increase in current and duty cycle MRR increased but for pulse on time it increased only up to 100 ΓβΓΒ΅s and then started to decrease. SR increased significantly with the increase in current; for pulse on time it increased up to 100 ΓβΓΒ΅s and after that there was no significant increase; and in case of duty cycle SR increased up to 70% and then started to decrease. OC increased with the increase in current and pulse on time but in different fashion and in case of duty cycle, OC increased up to 70% and then started decreasing.
ELECTRO CHEMICAL MACHINING AND ELECTRICAL DISCHARGE MACHINING PROCESSES MICRO...ijiert bestjournal
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Nowadays,necessity of small components is a common trend. These requirements encourage the researcher s to develop very minutest size components to fulfill the demand. The manufact uring of these type of components is a difficult ob ligation and for that various machining methods are develop to manufacture such c omponents. In this article the Electro Chemical mac hining and Electrical Discharge Machining is reviewed. We tried to summar ize the work of various researchers. The study show s that this type of machining processes gives good alternative.
Analysis of Machining Characteristics of Cryogenically Treated Die Steels Usi...IJMER
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International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessmentβ¦. And many more.
This document summarizes a research study that investigated near-dry electrical discharge machining (EDM) to optimize material removal rate (MRR) and surface finish. The study used a Taguchi L9 orthogonal array design of experiments to examine the effects of discharge current, pulse on time, gap voltage, and pulse off time on MRR and surface roughness. Response surface methodology was employed to optimize both responses simultaneously. The experimental results found that near-dry EDM achieved a better surface finish compared to wet EDM due to more stable machining at lower discharge energies. MRR and surface roughness were modeled as functions of the process parameters. The models showed the parameters and their interactions significantly affected MRR.
The document discusses experimentation on controlling tool wear during electric discharge machining (EDM) using statistical analysis and optimization techniques. Key points:
1) The experiment uses EN-31 material with copper electrodes and analyzes process parameters like discharge current, pulse on/off time on tool wear using Taguchi's design of experiments.
2) Analysis of variance (ANOVA) indicates discharge current, pulse on time, and pulse off time significantly affect tool wear.
3) The goal is to determine optimal parameter levels to minimize tool wear and validate the solution through experimentation on an EDM machine and statistical software.
The document discusses experimentation on controlling tool wear during electric discharge machining (EDM) using statistical analysis and optimization techniques. Key points:
1) The experiment uses EN-31 material with copper electrodes and analyzes process parameters like discharge current, pulse on/off time on tool wear using Taguchi's design of experiments.
2) Analysis of variance (ANOVA) indicates discharge current, pulse on time, and pulse off time significantly affect tool wear.
3) The goal is to determine optimal parameter levels to minimize tool wear and validate the solution through experimentation on an EDM machine and statistical software.
IRJET- An Experimental Investigation of Material Removal Rate in Electric Dis...IRJET Journal
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The document presents an experimental investigation into the effect of electric discharge machining (EDM) parameters on material removal rate (MRR) when machining heat-treated SK2MCr4 carbon tool steel. Experiments were conducted using a die-sinking EDM machine with a copper electrode. Current, pulse on time, and servo voltage were varied as parameters, while pulse off time was held constant. MRR was found to be most influenced by current, which contributed 64.29% to MRR. The optimal parameter combination for maximizing MRR was determined to be a current of 12 A, pulse on time of 60 ΞΌs, and servo voltage of 3 V.
THE EFFECT OF DIFFERENT WIRE ELECTRODES ON THE MRR OF MS WORKPIECE USING WEDM...IAEME Publication
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Wire electrical discharge machining (WEDM) is a specialized thermal machining process which is capable of accurate machining of parts which have varying hardness, complex shapes and sharp edges that are hard to be machined by the traditional machining processes. . Predictions on the
Material Removal Rate of workpieces in WEDM have been reported in the past. In the present study an analysis has been done to evaluate the Material Removal Rate of MS workpiece using WEDM process with different types of wire electrodes.
This document analyzes the effect of different wire electrodes on the material removal rate (MRR) of an MS workpiece using wire electrical discharge machining (WEDM). Experiments were conducted using copper, brass, and zinc-coated brass wire electrodes at various levels of current and pulse duration. The results showed that MRR was highest with copper wire and decreased with brass and zinc-coated brass wires. MRR also decreased with increasing current but increased with longer pulse duration. Statistical analysis through ANOVA confirmed that the wire material and pulse duration significantly affected the MRR while current had a lesser effect.
Optimization of EDM Process of (Cu-W) EDM Electrodes on Different ProgressionIJERA Editor
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This document summarizes previous research on optimizing EDM (electrical discharge machining) processes using different compositions of Cu-W electrodes. It discusses factors like material removal rate, tool wear rate, surface roughness, and how they are affected by machining parameters like discharge current, voltage, pulse-on time, duty cycle and flushing pressure. The document reviews several past studies that investigated these relationships and optimized the EDM process for different materials. It provides figures from some of these past studies to illustrate their findings.
MODELING AND OPTIMIZATION OF EDM PROCESS PARAMETERS: A REVIEWIAEME Publication
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Electrical discharge machining (EDM) is one of the earliest non-traditional machining processes. EDM process is based on thermo electric energy between the work piece and an electrode. There are different input parameters which influence on the outputs such as MRR, TWR and SR.
Optimization is one of the techniques used in manufacturing sectors to arrive for the best manufacturing conditions, which is an essential need for industries towards manufacturing of quality products at lower cost.
Modeling and optimization of edm process parameters a reviewIAEME Publication
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This document provides a review of research on modeling and optimization of electrical discharge machining (EDM) process parameters. It summarizes 22 research papers that developed mathematical models and applied optimization techniques like response surface methodology, Taguchi method, and genetic algorithms to determine optimal process parameters. The parameters studied include current, pulse on/off time, voltage, and material/electrode properties. The goals of optimization were to improve material removal rate, reduce tool wear and surface roughness. Modeling helped establish relationships between input and output parameters for better process control and performance.
effect of electrode material and geometry on edm performance for ohns dies s...INFOGAIN PUBLICATION
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Modern EDM machinery is capable of machining micro-hole, thin slots, geometrically complex or hard material components, that are precise and difficult to machine, such as heat treated tool steels, composites, super alloys, etc. The studies of an experimental investigation evaluate the effects of EDM machining parameters such as MRR, EWR and Surface Roughness with two different electrode materials. The process parameters such as Input current, Pulse on time and duty cycle keeping flushing pressure constant. The full factorial design of experiment (L25) is used to study the effects of machining parameters. Investigations indicate that the output parameters of EDM increases with the increase in input current and the best machining rates are achieved with copper with through hole electrodes, better surface roughness compare to brass electrode. A brass electrode with higher input current and maximum pulse on time resulted in more EWR compared to copper electrodes. Also the increase in MRR by copper electrode, it improves the SR during Electric Discharge Machining.
This document provides a technical review of secure banking using RSA and AES encryption methodologies. It discusses how RSA and AES are commonly used encryption standards for secure data transmission between ATMs and bank servers. The document first provides background on ATM security measures and risks of attacks. It then reviews related work analyzing encryption techniques. The document proposes using a one-time password in addition to a PIN for ATM authentication. It concludes that implementing encryption standards like RSA and AES can make transactions more secure and build trust in online banking.
This document analyzes the performance of various modulation schemes for achieving energy efficient communication over fading channels in wireless sensor networks. It finds that for long transmission distances, low-order modulations like BPSK are optimal due to their lower SNR requirements. However, as transmission distance decreases, higher-order modulations like 16-QAM and 64-QAM become more optimal since they can transmit more bits per symbol, outweighing their higher SNR needs. Simulations show lifetime extensions up to 550% are possible in short-range networks by using higher-order modulations instead of just BPSK. The optimal modulation depends on transmission distance and balancing the energy used by electronic components versus power amplifiers.
This document provides a review of mobility management techniques in vehicular ad hoc networks (VANETs). It discusses three modes of communication in VANETs: vehicle-to-infrastructure (V2I), vehicle-to-vehicle (V2V), and hybrid vehicle (HV) communication. For each communication mode, different mobility management schemes are required due to their unique characteristics. The document also discusses mobility management challenges in VANETs and outlines some open research issues in improving mobility management for seamless communication in these dynamic networks.
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Speaker:
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1. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)
e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 13, Issue 1 Ver. III (Jan. - Feb. 2016), PP 44-55
www.iosrjournals.org
DOI: 10.9790/1684-13134455 www.iosrjournals.org 44 | Page
Mathematical Modeling and Analysis of Influence of Process
Parameters on MRR during EDM of Stainless Steel 304
V.Vikram Reddy 1
, M.Shashidhar2
, P.Vamshi Krishna3
, B.Shiva Kumar 4
1
Professor, Mechanical engineering department Jayamukhi Institute of Technological sciences Warangal T.S
India-506332
2,3,4
Assistant Professor, Mechanical engineering department Jayamukhi Institute of Technological sciences
Abstract: The present work aims to investigate the influence of process parameters such as peak current, pulse
on time and pulse off time on material removal rate (MRR) in electrical discharge machining (EDM) of
Stainless Steel 304 material. Optimal combination of process parameters to get maximum MRR was achieved
using Taguchi method. Analysis of variance (ANOVA) has been performed to find the significant effect of
parameters on MRR and results revealed that process parameters such as Peak current, pulse on time and pulse
off time are having significant affect on MRR. Further regression analysis has been performed and developed
second order full quadratic mathematical model to establish relationship between MRR and process
parameters. The values of R2
(98.44%) and R2
adj (97.61%) of the model are in the acceptable range of variability
in predicting response values. Also the interactional effects among the process parameters were studied and
observed that peak current and pulse on time as well as peak current and pulse off time are significantly
intersecting each other.
Key Words: Electrical Discharge Machining, Peak Current, Pulse on Time, Pulse off Time, Material Removal
Rate, Taguchi Method, ANOVA, Regression Analysis
I. Introduction
Electrical discharge machining (EDM) is widely used advanced manufacturing processes in industry
for machining electrically conductive materials such as metals, metallic alloys, graphite, or even some
conductive ceramic materials, irrespective of their hardness. It is extensively used in the manufacture of mould,
die, automotive, aerospace and surgical components [2]. In this process removing of material from workpiece
through successive electrical discharges occurring between an electrode and a workpiece. This electric sparking
process is carried out in a dielectric liquid or in gas. The desirable properties of dielectric are low-viscosity, high
dielectric strength, quick recovery after breakdown, effective quenching/cooling and flushing ability. Spark is
initiated at the peak between the contacting surfaces of electrode and workpiece and exists only momentarily.
Metal as well as dielectric will evaporate at this intense localized heat. The influence of process parameters such
as discharge current, gap voltage, pulse-on time and duty cycle on performance characteristics material removal
rate, electrode wear rate and surface roughness was reported during RDM of Tiβ6Alβ4V alloy[12]. The effect of
process parameters namely peak current, pulse on time, duty factor and supply voltage on material removal rate
electrical discharge machining process using response surface methodology have been investigated.
Experiments were conducted on EN31 tool steel with electrolyte copper as electrode [11]. Taguchi-grey
relational approach based multi response optimization techniques were applied to maximize material removal
rate and to minimize surface roughness in electrical discharge machining of AISI 202 stainless steel using brass
has been used as tool electrode with kerosene as the dielectric medium [7]. Electrical process parameters such as
gap voltage, peak current and duty factor have been used as input parameters. The effects of each process
parameter on the responses were studied individually using the signal to noise ratio graphs and it was noticed
that the responses such as MRR and SR are mainly influenced by current followed by voltage, electrode rotation
and spark gap. Grey relational analysis (GRA) was used for simultaneous multi-response optimization of the
responses [3]. Investigated the influence of optimal set of process parameters such as current, pulse on time and
pulse on time in EDM process to identify the variations in three performance characteristics such as material
removal rate , tool wear rate, and surface roughness during EDM of Mild Steel IS2026 using copper electrode
[5]. Optimization of performance characteristics in unidirectional glass fiber reinforced plastic composites using
Taguchi method and Grey relational analysis was studied [4]. The influence of process parameters namely pulse
on time, duty cycle, discharge current and gap voltage on Tool Overcut during die sinking EDM of SS304 was
studied and it was found that duty cycle has most significant followed by discharge current and pulse on time on
tool over cut. Whereas gap voltage has least effect on Tool overcut [8]. The individual effect of process
parameters such as peak current and pulse duration on performance characteristics namely MRR, TWR and SR
have been explored. Experiments were conducted with PH17-4 stainless steel as work material and electrolyte
copper as electrode [10]. Conducted an experiments to examine the effect of process parameters such as peak
2. Mathematical Modeling And Analysis Of Influence Of Process Parameters On MRR During EDM β¦
DOI: 10.9790/1684-13134455 www.iosrjournals.org 45 | Page
current, pulse on time and pulse off time on performance characteristics related to surface integrity such as
surface roughness, white layer thickness and surface crack density during electrical discharge machining of
RENE80 nickel super alloy [9]. The use of Taguchi method was reported to optimize the machining parameters
such as current, pulse-on-time and pulse-off-time for EDM of tungsten carbide considering individual responses
namely MRR, EWR and SR [6]. Optimization of machining parameters (Pulse on time, Pulse off time and peak
current) of the Electric Discharge Machining on EN 31 tool steel with copper as an electrode was done
considering the Material Removal Rate as response using the Taguchi method [1].
From the literature survey it was noticed that less work has been reported on electrical discharge
machining of SS304 material. SS304 material is commonly used in gas turbines, piping, nuclear reactors,
pumps, and tooling. It is difficult to machining this material with conventional machining processes owing to its
high hardness. Hence it is necessary to explore the machinability characteristics of SS304 material during EDM
process. Hence the present work aims to investigate the influence of process parameters on MRR during EDM
of SS304 material. Analysis of variance (ANOVA) has been performed to find the significance of machining
parameters. Taguchi method (using of S/N ratios) was used to obtain optimal combination of process
parameters. Further regression analysis has been performed to establish relationship between MRR and
machining parameters and mathematical model was developed to predict MRR using RSM approach.
II. Design of Experiments, Experimental Set Up and Procedures
Experiments were conducted by choosing stainless steel 304 as work material and, electrolyte copper
of diameter ΓΈ14mm and length 60 mm was used as tool electrode. The chosen work material bar was cut into
specimens with dimensions of 100 Γ 18 Γ 8 mm3
using wire-cut EDM. The chemical composition and
mechanical properties of stainless steel 304 are shown in Table 1 and Table 2 respectively. The physical
properties of tool electrode are presented in Table3. In the present study, three process parameters such as peak
current, pulse on time and pulse off time and each parameter at three levels were considered. The total numbers
of experiments to be conducted are 33
=27. Each experiment was repeated two times to minimize the
experimental errors. Trial experiments were conducted using one factor-at-a-time approach to select range of
chosen process parameters. The working range of the selected process parameters and their levels is shown in
Table 4. Experiments were carried out on EDM machine model MOLD MASTERS605 using commercial EDM
oil grade SAE240 as dielectric fluid with side flushing. The experimental set up is shown in Figure 1.
Machining time considered for conducting each experiment is 5 min. The experimental conditions are given in
Table 5. The experiments were conducted as per the Orthogonal Array shown in Table 6,
Table1: Chemical composition of stainless steel 304
Element Percentage (%) Specifications(AISI304)
C 0.078 0.08Max
Mn 1.389 2.00Max
Si 0.328 1.00Max
P 0.033 0.045Max
S 0.008 0.030Max
Cr 18.072 18.00-20.00
Ni 8.163 8.00-10.50
Table 2: Mechanical properties of stainless steel 304
Density 7.8 (g/cmΒ³)
Specific capacity 400 (J/kg Β°k)
Thermal conductivity 18.4 (W/m Β°k)
Electrical resistivity 0.08Γ10-6
β¦ m
Modulus of elasticity 196 G Pa
Table 3: Physical properties of electrolyte copper
Density 8.95 (g/cmΒ³)
Specific capacity 383 (J/kg Β°C)
Thermal conductivity 394 (W/m Β°C)
Electrical resistivity 1.673Γ10Β―8 β¦ m
Melting point 1083Β°C
3. Mathematical Modeling And Analysis Of Influence Of Process Parameters On MRR During EDM β¦
DOI: 10.9790/1684-13134455 www.iosrjournals.org 46 | Page
Table 4: Working range of the process parameters and their levels
Parameter Unit Level1 Level2 Level3
Peak current, I Amps 8 16 24
Pulse on time, Ton Β΅s 50 100 150
Pulse off time, Toff Β΅s 35 65 95
Table 5: Experimental conditions
Working conditions Description
Work piece Stainless Steel (304) (100mmΓ18mmΓ8mm)
Electrode Electrolyte copper Γ 14mm and length 60 mm
Dielectric Commercial EDM Oil grade SAE 240
Flushing Side flushing with pressure 0.5MPa
Polarity Normal
Supply voltage 240 V
Machining time 5 minutes
Figure1: Experimental set up
Material removal rate (MRR), was selected to estimate machining performance. For weighing the work
pieces before machining and after machining digital weighing balance (citizen) (capacity up to 300 grams and
resolution of 0.1gms) was used. Then the material removal rate (MRR) is calculated with equation (1).
ππ π ππ3
πππ =
βπ
π π€ Γ π‘
β¦ β¦ β¦ (1)
Where βW is the weight difference of work piece before and after machining (g), π π€ is density of work material
(g/mmΒ³), and t is machining time in minutes.
Taguchi method is used to determine suitable combination of process parameters for obtaining
maximum MRR. The experimental MRR values are further transformed into a S/N ratios. The characteristic
MRR is chosen as βhigher-the-betterβ characteristic. Taguchi method uses the S/N ratio to measure the quality
characteristic deviating from the desired value. The S/N ratio Ξ· is defined as
π = β10 log πππ· β¦ β¦ β¦ (2)
πππ· ππ π =
1
π
1
ππ π π
2
π
π=1
β¦ β¦ β¦ (3)
After calculation of S/N ratio, the effect of each machining parameter at different levels was separated.
The mean S/N ratio for each process parameter at each level was calculated by averaging the S/N ratios for the
experiments at the same level for that particular parameter. Mean of means response tables and mean of means
graphs for MRR were prepared. The analysis of variance (ANOVA) has been applied to find out the
significance of parameters and the p value was used to determine whether the process parameter has significant
effect or not on the response MRR. The parameter has significant effect if value of p is less than 0.05 i.e. Ξ± =
0.05 (95% Confidence Level).
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III. Results and Discussions
3.1. Effect of Process Parameters on Material Removal Rate:
The average values of MRR for each trial (run) and respective S/N ratio values are presented in Table
7. Figure 2 presents main effects plot for means of MRR. Figure 3 shows main effects plot for S/N ratios of
MRR. A main effects plot can be used to compare the magnitudes of the various main effects and compare the
relative strengths of the effects across factors. However it is essential to proceed to estimate significance of
parameters using ANOVA Table. From Figures 2 and 3 it has been observed that MRR increases with
increasing in peak current.
24168
10.0
7.5
5.0
2.5
0.0
15010050
956535
10.0
7.5
5.0
2.5
0.0
I(A)
MeanofMeans
Ton
Toff
Main Effects Plot for Means of MRR
Data Means
Figure 2: Effect of process parameters on mean data of MRR
24168
20
15
10
5
0
15010050
956535
20
15
10
5
0
I(A)
MeanofSNratios
Ton
Toff
Main Effects Plot for SN ratios of MRR
Data Means
Signal-to-noise: Larger is better
Figure 3: Effect of process parameters on S/N Ratios of MRR
The increase in peak current causes increase in discharge energy resulting increased in current density.
This quickly over heats the work piece that increases MRR with peak current. Further discharge strikes
intensively over work piece surface with increase in current. This creates an impact force on the molten material
in the molten puddle and ejection of more material out of the crater. However MRR increases with increase in
pulse on time. The spark energy in the discharge channel and the period of transferring this energy in to the
electrodes increases with increase in pulse on time. This occurrence leads to formation of bigger craters
resulting increase in MRR (V.V Reddy et al, 2014). It was also noticed that MRR decreases with increase in
pulse off time.
Since it is always desirable to maximize the MRR larger the better option is selected. Figure 3 shows
that when peak current is at 24A (level 3), pulse on time is at 150Β΅s (level 3) and pulse off time is at 35Β΅s (level
1), give maximum MRR. At optimal parametric setting MRR value was calculated as 15.6789 (mmΒ³/min) and
corresponding S/N ratio is 24.5031. Table 8 shows response Table for means of MRR. Table 9 presents
response Table for S/N ratios for MRR.
The rank corresponds to the level of effect of input parameters based on the values of delta. Here
according to ranks, the effects of various machining parameters on MRR in sequence are peak current, pulse on
time and pulse off time. Table 10 presents the ANOVA for MRR at 95% confidence level. The data presented in
the ANOVA reveals the significance of input parameters on MRR which is as follows. The peak current, pulse
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on time and pulse off time are significant factors affecting the MRR since respective p values are less than Ξ±
value i.e., 0.05.
Table 8: Response Table for Means of MRR
Level I(A) Ton Toff
1 1.261 3.489 6.978
2 5.03 6.011 5.086
3 10.27 7.062 4.498
Ξ 9.009 3.573 2.48
Rank 1 2 3
Table 9: Response Table for S/N Ratios of MRR
Level I(A) Ton Toff
1 0.8849 8.1946 14.3254
2 13.2371 12.6039 10.8833
3 19.6746 12.9981 8.5879
Ξ 18.7897 4.8036 5.7375
Rank 1 3 2
Larger the better
Table 10: Analysis of Variance for MRR, using Adjusted SS for Tests
Source DF Seq SS Adj SS Adj MS F P
I(A) 2 368.508 368.508 184.254 70.87 0
Ton 2 60.693 60.693 30.346 11.67 0
Toff 2 30.225 30.225 15.112 5.81 0.01
Error 20 51.996 51.996 2.6
Total 26 511.421
S = 1.61239 R-Sq = 89.83% R-Sq(adj) = 86.78%
3.2 Mathematical model to predict MRR
RSM is a collection of mathematical and statistical technique that is useful for modeling and analysis
of problems in which output is influenced by several input variables. The objective is to find the correlation
between output and input variables are investigated. The second-order model is generally used when the output
function is not known or non-linear and the same is adopted. The following second-order model explains the
behavior of the system.
π = π½0 + π½π
π
π=1
ππ + π½ππ ππ
2
π
π=1
+ π½π,π
π,π =1,πβ π
ππ ππ +β β¦ β¦ β¦ . (4)
Where Y is the corresponding response Xi is the input variables, πππ
2
and ππ ππ are the squares and
interaction terms, respectively, of these input variables. The unknown regression coefficients are Ξ²o, Ξ²i, Ξ²ii and Ξ²ij
and the error in the model is depicted as Ο΅. It also confirms that this model provides an explanation of the
relationship between the Independent factors and the response or output for MRR. The second order response
surface representing the MRR can be expressed as a function of process parameters such as peak current, pulse
on time and pulse off time. The relationship between the MRR and process parameters can be expressed as
follows
ππ π = π½0 + π½1 πΌ + π½2 πππ + π½3 ππππ + π½4 πΌ πππ + π½5 πππ ππππ + π½6 πΌ ππππ + π½7 πΌ2
+ π½8 πππ
2
+ π½9 ππππ
2
β¦ β¦ β¦ (5)
The coefficients of regression Equation 5 are estimated from experimental data using Minitab14 a
statistical software package. The response surface models are developed, which are used to predict the results by
iso-response contour plot and 3D response surface plots to study the main effect of the variables and the mutual
interactions between the variables of the responses.
Table 11: R2
and R2
adj test for MRR regression model.
Degree of model R2
(%) R2
adj(%)
Linear 88.07 86.51
Linear + square 89.83 86.78
Linear + interaction 96.67 95.67
Full quadratic 98.44 97.61
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To decide the degree of the regression model, the values of the coefficient of determination (R2
) and
adjusted R2
-statistic (R2
adj) are estimated, compared and summarized in Table 11 for various models. It is
observed from the Table 11 that full quadratic model is the best among all the models, where R2
= 98.44%
indicates that 98.44% of total variation in the response is explained by predictors or factors in the model.
However, R2
adj is 97.61% which accounts for the number of predictors in the model describe the significance of
the relationship. Therefore, the full quadratic model is considered for further analysis in this study.
Table 12: Estimated Regression Coefficients for MRR
Term Coef SE Coef T P
Constant 2.07428 2.33758 0.887 0.387
I(A) -0.0552 0.15919 -0.347 0.733
Ton 0.02536 0.02547 0.996 0.333
Toff -0.085 0.04488 -1.894 0.075
I(A) x I(A) 0.01149 0.00438 2.627 0.018
Ton xTon -0.00029 0.00011 -2.627 0.018
Toff xToff 0.00072 0.00031 2.327 0.033
I(A) xTon 0.00444 0.0005 8.969 0
I(A) x Toff -0.00298 0.00083 -3.609 0.002
Ton x Toff -0.00003 0.00013 -0.212 0.834
S = 0.685958 PRESS = 20.7793 R2
= 98.44% R2
(pred) = 95.94% R2
(adj) = 97.61%
Table 12 represents the regression coefficients and its significance in the model. The columns in the
table correspond to the terms, the value of the coefficients (Coef.), and the standard error of the coefficient (SE
Coef), t-statistic and p-value to decide whether to reject or fail to reject the null hypothesis. To check the
adequacy of the model, with a confidence level of 95%, the p-value of the statistically significant term should be
less than 0.05. The values of R2
and R2
adj are 98.44%and 97.61% respectively of full quadratic model
exhibiting significance of relationship between the output and process parameters and the terms included in the
satisfactory model are I, Ton, Toff, I2
, Ton
2
, Toff
2
, IΓTon, TonΓToff, IΓ Toff.. Analysis of variance (ANOVA) is used
to check the adequacy of the second-order model, which includes test for significance of the regression model,
model coefficients and test for lack-of- fit. ANOVA of the model is shown in Table 13. This consists of two
sources of variation, such as regression and residual error. The regression error consists of variation due to the
terms in the model (sum of linear, square and interaction terms). Residual error consists of the lack of fit and
pure error.
Table 13: Analysis of Variance for MRR
Source DF Seq SS Adj ss Adj MS F P
Regression 9 503.422 503.422 55.9358 118.88 0
Linear 3 450.385 2.387 0.7956 1.69 0.207
I(A) 1 365.261 0.057 0.0565 0.12 0.733
Ton 1 57.446 0.467 0.4665 0.99 0.333
Toff 1 27.678 1.688 1.6883 3.59 0.075
Square 3 9.04 9.04 3.0134 6.4 0.004
I(A)* I(A) 1 3.247 3.247 3.2467 6.9 0.018
Ton*Ton 1 3.247 3.247 3.2467 6.9 0.018
Toff*Toff 1 2.547 2.547 2.547 5.41 0.033
Interaction 3 43.997 43.997 14.6657 31.17 0
I(A)*Ton 1 37.848 37.848 37.8483 80.44 0
I(A)*Toff 1 6.128 6.128 6.1276 13.02 0.002
Ton*Toff 1 0.021 0.021 0.0212 0.05 0.834
Residual Error 17 7.999 7.999 0.4705
Total 26 511.421
S = 0.685958 PRESS = 20.7793 R-Sq = 98.44% R-Sq (pred) = 95.94% R-Sq(adj) = 97.61%
The Table 13 depicts the sources of variation, degree of freedom (DF), sequential sum square error
(Seq SS), adjusted sum square error (Adj SS), adjusted mean square error (Adj MS), F statistic and the p-values
in columns. The p-value of regression model and its all square and interaction terms have p-value less than 0.05,
hence they are statistically significant at 95% confidence and thus the model adequately represent the
experimental data. Further mathematical model developed to predict MRR is
ππ π = 2.07428 β 0.05517 I + 0.02536 Ton β 0.08500Toff + 0.01149 I2
β 0.00029 Ton
2
+ 0.00072 Toff
2
+ 0.00444 I Ton β 0.00298 I Toff
β0.00003 Ton Toff β¦ β¦ (6)
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Table14 presents the process parameters for each run order, along with the experimental values of
MRR, the predicted values of MRR and the residues. The predicted values of MRR obtained using Equation 6
are close to the experimental values confirming the adequacy of the model. Normal probability plot (Figure4)
depicts that the residuals are almost falling on a straight line, which indicates that the residues are normally
distributed. The histogram plot (Figure4) shows the symmetry of the residues. It is in the form of Gaussian
distribution (bell shape), and the residues are distributed with mean zero. In addition, the plot of the residues
verse run order illustrates that there is no noticeable pattern or unusual structure present in the data as depicted
in Figure4. The residues, which lies in the range of -0.79865 to 1.569 are scattered randomly about zero, i.e., the
errors have a constant variance (Table 14). Further experimental values are compared with the predicted values
in Figure4. It was observed that the regression model is fairly well fitted with the experimental values.
Table14: Process Parameters, Predicted MRR and Residues.
Expt
No
Process parameters Response (MRR) (mm3
/min)
I Ton Toff Experimental
predicted residual
(A) (Β΅s) (Β΅s)
1 8 50 35 2.0177 1.7059 0.31176
2 8 50 65 1.3871 0.571 0.81617
3 8 50 95 0.3783 0.7391 -0.3608
4 8 100 35 1.5132 2.494 -0.9808
5 8 100 65 1.261 1.3171 -0.0561
6 8 100 95 1.1349 1.4432 -0.3083
7 8 150 35 2.1438 1.811 0.33277
8 8 150 65 1.0088 0.592 0.41684
9 8 150 95 0.5044 0.6761 -0.1716
10 16 50 35 4.2875 4.4136 -0.1261
11 16 50 65 1.7654 2.5641 -0.7987
12 16 50 95 2.5221 2.0177 0.50441
13 16 100 35 7.1879 6.9777 0.21017
14 16 100 65 5.0441 5.0862 -0.042
15 16 100 95 4.7919 4.4977 0.29424
16 16 150 35 7.9445 8.0706 -0.1261
17 16 150 65 6.053 6.137 -0.0841
18 16 150 95 5.6747 5.5065 0.16814
19 24 50 35 7.8184 8.5925 -0.7741
20 24 50 65 6.4313 6.0284 0.40283
21 24 50 95 4.7919 4.7674 0.02452
22 24 100 35 14.5019 12.9326 1.56928
23 24 100 65 10.3405 10.3265 0.01401
24 24 100 95 8.3228 9.0234 -0.7006
25 24 150 35 15.3846 15.8015 -0.4168
26 24 150 65 12.4842 13.1533 -0.6691
27 24 150 95 12.3581 11.8082 0.54995
Figure 5 presents interaction plot for means of MRR. It was noticed from the Figure 5 that I, and Ton as
well as I, and Toff are intersecting each other significantly at a confidence level of 95%, .The same observation
was made from Table 13.
Figure 6(a) and (b) represents contour plot and surface plot respectively for MRR in relation to process
parameters of I and Ton keeping Toff remains constant at 65 ΞΌs. It was seen from the Figure 6 that, significant
increase in MRR with increase in I for any value of Ton. However it was also observed that MRR increases
sharply with increase in Ton. The effect of I and Toff on the estimated contour and surface plots of MRR is
shown in Figure 7(a) and (b), respectively, keeping Ton remains constant at 100ΞΌs. It can be noted that, when I
increases MRR is increasing, however, MRR decreases with increase in Toff,. Figure 8 (a) and (b) represent
contour and surface plots of MRR as a function of Ton and Toff keeping I remains constant at 16 A. The lowest
possible MRR value occurred at smaller Ton and at higher Toff values. Further it can be concluded that I, and Ton
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are directly proportional to the MRR, whereas Toff is inversely proportional to the MRR for the given range of
experiments conducted for this test.
10-1
99
90
50
10
1
Residual
Percent
1612840
1
0
-1
Fitted Value
Residual
1.51.00.50.0-0.5-1.0
4.8
3.6
2.4
1.2
0.0
Residual
Frequency
2624222018161412108642
1
0
-1
Observation Order
Residual
Normal Probability Plot Versus Fits
Histogram Versus Order
Residual Plots for MRR
Figure 4: Residual plots for MRR
10
5
0
956535
15010050
10
5
0
24168
10
5
0
I(A )
T on
T off
8
16
24
I(A)
50
100
150
Ton
35
65
95
Toff
Interaction Plot for Means of MRR
Data Means
Figure 5: Interaction plot for Means of MRR
I(A)
Ton
22.520.017.515.012.510.0
150
125
100
75
50
Toff 65
Hold Values
>
β
β
β
β
β
< 2
2 4
4 6
6 8
8 10
10 12
12
MRR
Contour Plot of MRR vs Ton, I(A)
Figure 6 (a) Contour plot of MRR vs Ton, I(A)
150
100
0
5
10
50
15
10 15 20 25
Ton
MRR
I(A)
Toff 65
Hold Values
Surface Plot of MRR vs Ton, I(A)
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Figure 6 (b) Surface plot of MRR vs Ton, I(A)
I(A)
Toff 22.520.017.515.012.510.0
90
80
70
60
50
40
Ton 100
Hold Values
>
β
β
β
β
β
< 2
2 4
4 6
6 8
8 10
10 12
12
MRR
Contour Plot of MRR vs Toff, I(A)
Figure 7(a) Contour plot of MRR vs Toff, I(A)
0100
4
8
12
80
25
60 20
15
40 10
MRR
Toff
I(A)
Ton 100
Hold Values
Surface Plot of MRR vs Toff, I(A)
Figure 7(b) Surface plot of MRR vs Toff, I(A)
Ton
Toff
1501251007550
90
80
70
60
50
40
I(A) 16
Values
Hold
>
β
β
β
β
β
< 3
3 4
4 5
5 6
6 7
7 8
8
MRR
Contour Plot of MRR vs Toff, Ton
Figure 8(a) Contour Plot of MRR vs Toff, Ton
150
1002
4
6
100
8
80 5060
40
Ton
MRR
Toff
I(A) 16
Hold Values
Surface Plot of MRR vs Toff, Ton
Figure 8(b) Surface Plot of MRR vs Toff, Ton
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3.3. Confirmation Experiment
To verify the predicted value of MRR confirmation experiment was conducted at their optimal
parametric setting. The deviation of predicted value from experimental value was calculated as percentage error
and is presented in Table 15.
%πππππ =
ππ₯ππππππππ‘πππ£πππ’π β πππππππ‘πππ£πππ’π
ππ₯ππππππππ‘πππ£πππ’π
Γ 100 β¦ β¦ β¦ (7)
Table 15: confirmation of experiments at Optimal conditions (dielectric only)
S.No.
Optimum parameters
Response
Experimental
value
Predicted
value
%errorI Ton Toff
(A) (Β΅s) (Β΅s)
1 24 150 35
Max.MRR
(mmΒ³/min)
15.3846 15.6789 1.91
IV. Conclusions
The following conclusions have been arrived during the present work:
1. Stainless Steel 304 can easily be machined on EDM with reasonable speed and surface finish. It is difficult
to machine Stainless Steel 304 on conventional machining because of shorter tool life and severe surface
damage due to its high hardness and strength.
2. MRR is increased with increase in peak current and pulse on time. However MRR decreases with increase
in pulse off time.
3. Further optimal combination of process parameters are: I is at 24A, Ton is at 150Β΅s and Toff is at 35 Β΅s yield
maximum MRR (15.6789 mmΒ³/min), Confirmation experiment was conducted at respective optimal
parametric setting corresponding MRR value 15.3846 mmΒ³/min and percentage error was found to be
1.91%.
4. The analysis of variance reveals that process parameters such as Peak current, pulse on time and pulse off
time are having significant affect on MRR.
5. Regression analysis has been performed and developed second order full quadratic mathematical model to
establish relationship between MRR and process parameters (I, Ton and Toff). The values of R 2
and R2
adj
of the model are in the acceptable range of variability in predicting response values. The predicted values of
MRR using regression equation, corresponding residuals and percentage error were calculated. The
percentage error in predicting MRR is less than 5% hence the mathematical model given below is adequate
in predicting the MRR values.
ππ π = 2.07428 β 0.05517 I + 0.02536 Ton β 0.08500Toff + 0.01149 I2
β 0.00029 Ton
2
+ 0.00072 Toff
2
+ 0.00444 I Ton β 0.00298 I Toff β 0.00003 Ton Toff β¦ β¦ (6)
6. The interactional effects among the process parameters were studied and observed I, and Ton as well as I,
and Toff are intersecting each other significantly at a confidence level of 95%, .The significance of
interactional terms are verified with ANOVA and these terms were included in the regression model.
References
[1]. A.Aravindan, S.Rajendra βOptimization of Machining Parameters in EDM process by using Robust Designβ International Journal
of Advanced Scientific and Technical Research, Issue 3 vol. 2, March-April (2013)
[2]. Ho, K.H, Newman, S.T. State of the art electrical discharge machining (EDM) International Journal of Machine Tools and
Manufacture, 43(13): 1287β1300 (2003).
[3]. M.Janardhan βMulti-ResponseOptimizationofProcessParametersin ElectricalDischargeMachiningUsingGrey RelationalAnalysisandTaguchi
Methodβ International Journal of Research in Mechanical engineering & technology,Vol.4, pp2249-5770, (2014)
[4]. Meenu Gupta and Surinder Kumar βMulti-objective optimization of cutting parameters in turning using grey relational analysisβ
International Journal of Industrial Engineering Computations 4 (2013) 547β558.
[5]. Raghuraman S, Thiruppathi K, PanneerselvamT ,SantoshS βOptimization of EDM parameters using Taguchi method and Grey
Relational Analysis for mild steel is 2026β International Journal of Innovative Research in Science, Engineering and Technology
Vol.2, Issue 7,July2013.
[6]. SubhakantaNayak, B.C.Routara βOptimization of Multiple Performance Characteristics in Electro Discharge Machining Using Grey
Relational Analysisβ international journal of scientific & technology research Vol3, Issue 4, April (2014).
[7]. T Muthuramalingam and B. Mohan, βTaguchi β grey relation based multi response optimization of electrical process parameters in
electrical discharge machineβ, Indian Journal of Engineering & Material Science, Vol. 20, pp. 471-475, December (2013)
[8]. T.Roy, R.K.Dutta βStudy of the Effect of EDM Parameters based on Tool Overcut using Stainless Steel (SS 304 Grade)β
International Journal of Engineering Trends and Technology (IJETT) β Volume 13 Number 5 β Jul 2014.
[9]. U.Shrinivas Balraj, A.Gopala Krishna βMulti-Objective Optimization of EDM Process Parameters using Taguchi Method, Principal
Component Analysis and Grey Relational Analysisβ, International Journal of Manufacturing, Materials, and Mechanical
Engineering, 4(2), 29-46, April-June 2014 29.
12. Mathematical Modeling And Analysis Of Influence Of Process Parameters On MRR During EDM β¦
DOI: 10.9790/1684-13134455 www.iosrjournals.org 55 | Page
[10]. V. Vikram Reddy P. Madar Valli A. Kumar Ch Sridhar Reddy, Influence of Process Parameters on Characteristics of Electrical
Discharge Machining of PH17-4 Stainless Steel, Journal of Advanced Manufacturing Systems Vol. 14, No. 3 pp189β202 (2015),
DOI: 10.1142/S0219686715500122.
[11]. V. Vikram Reddy P. Madar Valli, Ch Sridhar Reddy, P.Rangaiah, Mathematical Modeling of Process Parameters on Material
Removal Rate in EDM of EN31steel Using RSM Approach International Journal of Research and Innovations in Science and
Technology Vol.1, Issue.1, pp49β53 (2014).
[12]. V.Chittaranjan Das, C.Srinivas βOptimization of Multiple Response Characteristics on EDM Using the Taguchi Method and Grey
Relational Analysisβ International Journal of Scientific Research and Reviews, IJSRR, 3(1), 25- 39 (2014)