ELECTRIC DISCHARGE MACHINING(EDM)
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Transcript of ELECTRIC DISCHARGE MACHINING(EDM)
ELECTRIC DISCHARGE MACHINING
AMAN BAKSHI 2013EME09AMIT SUHAG 2013EME10AMITOJ SINGH 2013EME11
CONTENTS
Origin and Introduction Principle of EDM Construction and working Heat Affected Zone Applications Advantages and Disadvantages
Introduction
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
This principle involves different phases like
1) Application of voltage 2) Formation of plasma channel 3) Discharge phase 4) Collapse of plasma channel
Construction and Working
Components of EDM
Tool and Work piece Dielectric fluid Pump Filter Power source
Plasma generation in EDM
ADVANTAGES1) 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 made4) Tool making is easier as it is made
from softer metals5) There is no heating of bulk material6) The chips are being continuously
flushed
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.
APPLICATIONS1) 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