10-04-2017, 09:29 PM
Presented by
Deekshith.N.G
[attachment=14729]
ELECTROCHEMICAL DISCHARGE MACHINING
ECM EDM ECDM
PRINCIPLE OF WORKING
ECM-Anodic dissolution of work
EDM-Spark errosion
ECDM-Anodic dissolution&Spark errosion
Electro chemical reaction
Passivating film
Spark errosion
EQUIPMENT
LAB ARRANGEMENT
ZZ
EQUIPMENT
Voltage-40-200V,DC
Current-3-4A
Electrolyte-semi dielectric fluids
Electrode gap-.01-1micro meters
3D tool feeder
WORKING
Anodic dissolution
Passivating film formation
Spark errosion
TOOL PROPERTIES
High electrical conductivity
High themal conductivity
High melting point
Cheapness
High machinability
Eg:cu,chisel steel,graphite,etc.
FUNCTIONS OF ELECTROLYTE
Maintain constant resistance accross the gap
Cools the spark region
Removes erroded particles
Aviod welding of tool and work
Eg:aqu solution of KOH,sodium silicate,sodium nitrate,etc
MICROSCOPIC VIEW OF SURFACE OBTAINED
AA
HOLE OBTAINED BY ECDM
TOOL WEAR
FACTORS AFFECTING TW
1.Diameter of tool
2.Voltage
3.Capacity
4.Liquid density
w = 1.329 10^ 11 D ^ 1.27 U^ 5.739 C^ 0.36 ^ 9.655
COMPARISON
ADVANTAGES
High accuracy
Method does not leave any chips or burrs
High surface finish
Less power consumption
Does not need skilled operators
Machine conducting and non concucting
DISADVANTAGES
Low mrr
Electrode wear
High initial cost
Thickness of ceramic material can be machined is limited to 1.5mm
Radial over cut
applications
ECDG
ECDD
CONCLUSION
It utilizes both the advantages of ECM &EDM
The applied voltage,electrotyte cocetration,elecrode gap are affect the MRR
The applied voltage,dia of tool,density,capacity are affect the tool wear
Journal of materials processing by Amalink.S.M
International journal of machinetools by Kim
Deekshith.N.G
[attachment=14729]
ELECTROCHEMICAL DISCHARGE MACHINING
ECM EDM ECDM
PRINCIPLE OF WORKING
ECM-Anodic dissolution of work
EDM-Spark errosion
ECDM-Anodic dissolution&Spark errosion
Electro chemical reaction
Passivating film
Spark errosion
EQUIPMENT
LAB ARRANGEMENT
ZZ
EQUIPMENT
Voltage-40-200V,DC
Current-3-4A
Electrolyte-semi dielectric fluids
Electrode gap-.01-1micro meters
3D tool feeder
WORKING
Anodic dissolution
Passivating film formation
Spark errosion
TOOL PROPERTIES
High electrical conductivity
High themal conductivity
High melting point
Cheapness
High machinability
Eg:cu,chisel steel,graphite,etc.
FUNCTIONS OF ELECTROLYTE
Maintain constant resistance accross the gap
Cools the spark region
Removes erroded particles
Aviod welding of tool and work
Eg:aqu solution of KOH,sodium silicate,sodium nitrate,etc
MICROSCOPIC VIEW OF SURFACE OBTAINED
AA
HOLE OBTAINED BY ECDM
TOOL WEAR
FACTORS AFFECTING TW
1.Diameter of tool
2.Voltage
3.Capacity
4.Liquid density
w = 1.329 10^ 11 D ^ 1.27 U^ 5.739 C^ 0.36 ^ 9.655
COMPARISON
ADVANTAGES
High accuracy
Method does not leave any chips or burrs
High surface finish
Less power consumption
Does not need skilled operators
Machine conducting and non concucting
DISADVANTAGES
Low mrr
Electrode wear
High initial cost
Thickness of ceramic material can be machined is limited to 1.5mm
Radial over cut
applications
ECDG
ECDD
CONCLUSION
It utilizes both the advantages of ECM &EDM
The applied voltage,electrotyte cocetration,elecrode gap are affect the MRR
The applied voltage,dia of tool,density,capacity are affect the tool wear
Journal of materials processing by Amalink.S.M
International journal of machinetools by Kim