All you want to know about electric discharge machining process in manufacturing process.

1. ELECTRIC DISCHARGE
MACHINING
AMAN BAKSHI 2013EME09
AMIT SUHAG 2013EME10
AMITOJ SINGH 2013EME11

2. CONTENTS
 Origin and Introduction
 Principle of EDM
 Construction and working
 Heat Affected Zone
 Applications
 Advantages and Disadvantages

4. Introduction

7. Principle
 Work piece and tool are submerged in a
dielectric fluid
 Work piece and tool is separated by small gap
called spark gap
 Gap is kept so the spark can take place and
material can be removed from the work piece
 The dielectric is replaced after sometime with
the help of pump and filter

8.  This principle involves different phases like
1) Application of voltage
2) Formation of plasma channel
3) Discharge phase
4) Collapse of plasma channel

9. Construction and Working

11. Components of EDM
 Tool and Work piece
 Dielectric fluid
 Pump
 Filter
 Power source

12. Plasma generation in EDM

16. ADVANTAGES
1) Conducting materials regardless of their
hardness strength toughness and
microstructure can be easily machined
2) The tool and work piece are free from cutting
forces
3) Complex shapes can be easily made
4) Tool making is easier as it is made from softer
metals
5) There is no heating of bulk material
6) The chips are being continuously flushed

17. DISADVANTAGES
1) Low MRR.
2)The w/p must be electric conductor.
3) The surface after machining is highly stressed.
4) Machining time is too long.
5) Specific power consumption is too high.
6) It needs further finishing as the surface finish is
not so good.

18. APPLICATIONS
1) It is used in the production of die for fabrication
of all components.
2) EDM can be used in manufacturing of hydraulic
valve spools, gear wheels, fine holes or slots in
hard blade materials used in gas turbines,
compressors, diesel engines etc.
3) It is used in fabrication, extrusion, blanking,
stamping and embossing dies.
4) It is also used for machining of harder materials
which cant be machined by conventional
methods