This document discusses electrical discharge machining (EDM). EDM is a machining process that uses electrical sparks to remove material from a workpiece. In EDM, a tool electrode is moved close to the workpiece and an electric current is applied, creating sparks that erode away material. Key aspects covered include the basic components and setup of an EDM machine, the working principle of how material is removed through electric sparks, important process parameters, and applications where EDM is commonly used such as machining hard metals and complex shapes.
Electric Discharge Machine ( E.D.M) - A Non Conventional Machining Process Gururam Prasad
Electric Discharge Machining is shortly called as EDM. In EDM the metal is removed due to erosion caused by rapidly occurring discharge between the tool and workpiece. The mechanism involved in Material removal is melting and evaporation.
Electro Discharge Machining
Introduction
Process
Process Parameters
Dielectric
Advantages of EDM
APPLICATIONS
Power generator
Wire EDM
ELECTRIC DISCHARGE GRINDING (EDG)
Here you are watching PowerPoint Presentation of EDM (Electrical Machining Process). It is a kind of unconventional machining process.Thanks for watching.
Electric Discharge Machine ( E.D.M) - A Non Conventional Machining Process Gururam Prasad
Electric Discharge Machining is shortly called as EDM. In EDM the metal is removed due to erosion caused by rapidly occurring discharge between the tool and workpiece. The mechanism involved in Material removal is melting and evaporation.
Electro Discharge Machining
Introduction
Process
Process Parameters
Dielectric
Advantages of EDM
APPLICATIONS
Power generator
Wire EDM
ELECTRIC DISCHARGE GRINDING (EDG)
Here you are watching PowerPoint Presentation of EDM (Electrical Machining Process). It is a kind of unconventional machining process.Thanks for watching.
it is a presentation on electrical discharge machining which is new method for machining hard conductive materials which are difficult to machine with old technique of machining. it does not cause wear of tool.
Literature Review on Electrical Discharge Machining (EDM)
Research Paper Published by:
Vishal Kumar Jaiswal
M.Tech (Production and Industrial Engineering)
Paper Source:
http://ijsrd.com/articles/IJSRDV6I50167.pdf
http://ijsrd.com/Article.php?manuscript=IJSRDV6I50167
it is a presentation on electrical discharge machining which is new method for machining hard conductive materials which are difficult to machine with old technique of machining. it does not cause wear of tool.
Literature Review on Electrical Discharge Machining (EDM)
Research Paper Published by:
Vishal Kumar Jaiswal
M.Tech (Production and Industrial Engineering)
Paper Source:
http://ijsrd.com/articles/IJSRDV6I50167.pdf
http://ijsrd.com/Article.php?manuscript=IJSRDV6I50167
Electrical Discharge Machine is an advanced machining method which removes metal by a series of recurring electrical discharges betweenn an electrode and a conductive workpiece, submerged in a dielectric fluid.
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The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
1. VISVESVARAYA TECHNOLOGICAL UNIVERSITY
BELAGAVI - 590018
An Assignment on
“Electrical Discharge Machining (EDM)”
Bachelor of Engineering in Mechanical Engineering 6th semester
Biki Debbarma
Deekshith Gowda
Kiran Gowda
1AT19ME401
1AT19ME402
1AT19ME404
Under the Support and Guidance of
Prof. Anjan Kumar D
Department of ME
Department of Mechanical Engineering
Atria institute of Technology
(Approved by AICTE, New Delhi, Accredited by NBA, NAAC, New Delhi & Affiliated to VTU, Belagavi)
Submitted by
2. Contents :
1. Definition
2. Schematic setup of Machine
3. List of Components and its functions
4. Working Principle
5. Process Parameters
6. Advantages
7. Limitations
8. Applications
9. References
3. • Sometimes it is referred to as spark machining, spark eroding, burning, die sinking or wire erosion.
It is a metal fabrication process whereby a desired shape is obtained using electrical discharges
(sparks).Material is removed from the workpiece by a series of rapidly recurring current discharges
between two electrodes, separated by a dielectric liquid and subject to an electric voltage.
• One of the electrodes – ‘tool-electrode’ or ‘tool’ or ‘electrode’. Other electrode- workpiece-
electrode or ‘electrode’. As distance between the two electrodes is reduced, the current intensity
becomes greater than the strength of the dielectric (at least in some points) causing it to break’.
This allows current to flow between the two electrodes. This phenomenon is the same as the
breakdown of a capacitor.
• As a result, material is removed from both the electrodes. Once the current flow stops, new liquid
dielectric is usually conveyed into the electrode zone enabling the solid particles (debris) to be
carried away. Adding new liquid dielectric in the electrode volume is commonly referred to as
flushing. Also, after a current flow, a difference of potential between the two electrodes is restored
to what it was before the breakdown, so that a new liquid dielectric breakdown can occur.
Definition :
6. The main components in EDM:
Electric power supply
Dielectric medium
Work piece & tool
Servo control unit.
• The work piece and tool are electrically connected to a DC power supply.
• The current density in the discharge of the channel is of the order of 10000 A/cm2 and
power density is nearly 500 MW/cm2 .
• A gap, known as SPARK GAP in the range, from 0.005 mm to 0.05 mm is maintained
between the work piece and the tool.
• Dielectric slurry is forced through this gap at a pressure of 2 kgf/cm2 or lesser.
Components and its functions :
9. Working Principle :
In this process, work piece should be well electric conductive. Only electric conductive
material can be machined by this method. The working of EDM is as follow.
• First both work piece and tool are submerged into dielectric fluid. The dielectric fluid
help to control the arc discharge. This also removes suspended particles of work piece
material and tool from the work cavity.
• A servomechanism is used which maintains a very small gap between the work piece
and the tool. This gap is desirable for proper arc formation. It is about the thickness of
human hair.
• The tool is made as the opposite shape of work piece.
10. • A high frequency current supplied to electrode, which produces a spark
between the tool and work piece. This spark generates high in work cavity.
• The metal removed from the work piece due to erosion and evaporate ion.
• The chips or suspended particle between tool and work piece should be
removed to prevent them to form bridge that causes short circuit. This is done
by continuous supply of dielectric fluid.
• The EDM produce a cavity slightly larger than the electrode because of overcut.
Working Principle :
11. The waveform is characterized by the:
• The open circuit voltage — Vo
• The working voltage — Vw
• The maximum current — Io
• The pulse on time — the duration for which the voltage pulse is applied - ton
• The pulse off time — toff
• The gap between the workpiece and the tool — spark gap - Ꝺ
• The polarity — straight polarity — tool (-ve)
• The dielectric medium
• External flushing though the spark gap.
Process Parameters:
13. Advantages :
Some of the advantages of EDM include machining of :
• shapes that would otherwise be difficult to produce with conventional
cutting tools.
• Extremely hard material to very close tolerances.
• Very small work pieces were conventional cutting tools may damage the
part from excess cutting tool pressure.
• There is no direct contact between tool and work piece. Therefore
delicate sections weak materials can be machined without any distortion.
• A good surface finish can be obtained.
14. Disadvantages :
Some of the disadvantages of EDM include:
• The slow rate of material removal.
• For economic production, the surface finish specified should not be too fine.
• The additional time and cost used for creating electrodes for ram/sinker EDM.
• Reproducing sharp corners on the workpiece is difficult due to electrode wear.
• Specific power consumption is very high.
• Power consumption is high.
• "Overcut" is formed.
• Excessive tool wear occurs during nuchining.
• Electrically non-conductive materials can be machined only with specific set-up of
the process
15. • Drilling of micro-holes, thread cutting, helical profile milling, rotary forming, and curved
hole drilling.
• Delicate work piece like copper parts can be produced by EDM.
• Can be applied to all electrically conducting metals and alloys irrespective of their
melting points, hardness, toughness, or brittleness.
• Other applications: deep, small-dia holes using tungsten wire as tool, narrow slots,
cooling holes in super alloy turbine blades, and various intricate shapes.
• EDM can be economically employed for extremely hardened work piece.
• Since there is no mechanical stress present (no physical contact), fragile and slender
work places can be machined without distortion.
• Hard and corrosion resistant surfaces, essentially needed for die making, can be
developed
Applications :
16. References :
Non Traditional Machining Notes By G.S Shashidhara, at www.academia.edu
Introduction to Non Traditional Machining, at www.home.iitk.ac.in
Non Conventional Machining by P.K Mishra
YOUTUBE Link https://youtube.com/watch?v=L1D5DLWWMp8&feature=share