OPTIMIZATION OF THE WEIGHT OF THE POWER PRESS USING ANSYS & PRO-E BHARATHIYAR COLLEGE OF ENGINEERING & TECHNOLOGY KARAIKAL UNDER THE GUIDANCE OF Mr. G.KARTHIKEYAN SENIOR LECTURER DEPT OF MECHANICAL ENGG PRESENTED BY K.MURUGADASS
The project focuses on the optimization of the weight of a C Frame Hydraulic Power Press using ANSYS and PRO/E. The need for the project is that with heavy cost cutting going on, on every aspect of production companies, it is essential to reduce the cost of manufacturing a component or a machine by properly calculating the amount of material used to manufacture it. Here in this case, the material weight used to manufacture the frame of the C Frame Hydraulic Power Press is reduced by analyzing the power press by applying load on it virtually with all the boundary conditions in place. Then by calculating the deflection and stress on every part of the power press, the material weight is reduced by reducing the thickness of the frame and the thickness of the bed. Then finally with constant deflection and stress in mind, the weight reduction is stopped. Then the weight before analysis and after analysis is calculated and the difference is observed. Then the cost saved is calculated and the graphs for the observed values are plotted out.
Press machines and press tools are considered as a back bone of the modern machine shop of large industry set up, producing wide variety of articles such as vehicle bodies, electrical accessories and furniture. At high production rate.
Wide variety of machines are built because of the growing typical demand, expansion and progress. Press working does not involve heating of part, close and high surface finish can be obtained on the part. Press work parts do not require any machining also.
Power press are used for producing large quantities of articles quickly, accurately and economically from the cold working of mild steel and other ductile materials. The components produced range over an extremely wide field and are used throughout industry.
It is also necessary to plan the operations to reduce scrap material to a minimum and to use waste material for other smaller pressings. For any operations to be performed on press, the selection of the proper press and the design of the tool or die to be mounted on it are very important.
Pro/Engineer wildfire is a powerful program used to create complex designs with a great precision. We can use the powerful tools of Pro/Engineer wildfire to capture the design intent of any complex model by incorporating intelligence into the design.
An assembly is defined as a design consisting of more than one component bonded together at their respective working positions. These assembly designs are created in the assembly mode of Pro/Engineer.
This is the method of assembling the components in which the components of the assembly are created in the same assembly file. In this type of approach of assembly, the components are created in the assembly file and then assembled using the assembly constraints. The parts we create in the assembly mode are saved in .prt files.
This is the method of assembling the components that are created as separate parts in the part mode and are saved as .prt files. Once all the parts of an assembly have been created, we create a new assembly file (.asm) and then assemble constraints available in the assembly mode to create the assembly. Since the assembly file has information related only to the assembling of components. This file is not very heavy and therefore requires less hard disk space.
Here in this project we are using Bottom-Up Approach
Different types of elements are used for analysis. On meshing a continuum, it is divided in to small elements and these elements are solved to obtain the described solution. The various types of elements are listed
Here a ‘C’ framed power press is taken into consideration, and in this project we consider punching operation. While punching, the Ram has to travel from the punch holder to the die block. So in this operation, due to the ram speed and force, some deflections are undergone in the structure.
Here we are going to consider the deflections and stresses in the structure and minimize the material wherever there is no deflection and stress. Hence this reduces the weight of the power press and minimizes the cost of the production.
The source of the project is from the company, BHARATH PRESSINGS, Pvt Ltd, Chennai. The dimensions and specifications of a 10 tonne capacity press are obtained from this company. The manufacturer of the C framed power press is BEMCO PRESSES, Pune
Standard C-Frame presses bring hydraulic precision and control to most pressroom applications including punching, blanking, coining, forming, bending, drawing and assembly work. The C- frame press is considered because of its high rigid frame construction and also the maintenance cost of the press is less compared to other.
For economical production of quantities of pressings, consideration has to be given to the rate of production, the cost of the press tools to be employed and the expenditure involved in setting them.
In most of the presses there are some excess materials where no stress is acting there. This increases the material weight and cost for the manufacturer. So these materials should be removed to reduce the material usage to increase the profit for the manufacturer.
The modeling of power press is carried out in Pro/Engineer software. Pro/Engineer wildfire is a feature based solid modeling tool using Bottom-Up Approach. The use of the feature-based property provides greater flexibility to the parts created. The accuracy rate is high compared to other modeling software’s. According to these features the modeling of the power press is done in Pro/Engineer software.
Applicable ANSYS Products: ANSYS Multi physics, ANSYS Mechanical, ANSYS Structural, ANSYS ED
Analysis Type: Static
Element Types Used: Solid brick 8 node 45
ANSYS Features Demonstrated: solid modeling including primitives, Boolean operations, and fillets; tapered pressure load; deformed shape and stress displays; listing of reaction forces; examination of structural energy error
The C-framed power press is modeled in PRO/E software package according the specifications, and it is analyzed in ANSYS environment. Here the stress and deformations are calculated and according to this the frame thickness, web thickness, material, weight are modified.
Four number of trials where made using following dimension criteria.
Results for cases bed thickness 100mm, frame thickness 25mm and bed thickness 70mm, frame thickness 18mm are presented and compared for optimization
Results for cases bed thickness 100mm, frame thickness 25mm and bed thickness 70mm, frame thickness 18mm are presented and compared for optimization 18mm 19mm 22mm 25mm FRAME THICKNESS 70mm 80mm 90mm 100mm BED THICKNESS
Regarding static analysis, the design is safe. In this design, the decrease in frame and bed thickness is done. So there is a reduction in weight.
The reduction in weight is 13.5%. finally we conclude that this design is the better design.
Existing weight of the power press: 1920Kg
Modified weight of the power press: 1660Kg
In this project the C framed Power Press is studied and the design was done as per the dimensions. The model of the power press is done in PRO/ENGINEER software. The analysis of the power press is carried out using ANSYS package. Finally the modified design is obtained by changing or varying the frame thickness and bed thickness and thus the objective of the study is achieved.