Spark Erosion Machining by Himanshu Vaid

Spark Erosion Machining by Himanshu Vaid

1. MEWAR UNIVERSITY SPARK EROSION MACHINING

2. Sparking takes place between two electrical contacts a small amount of material is removed from each of the contacts. This facts was realized and the attempts were made to harness and control the spark energy to employ it for useful purpose , say, for machining of metals. It was found that the sparks of short duration and high frequency are needed for efficient machining. ELECTRIC DISCHARGE MACHINING

3. It was also observed that if the discharged is submerged in dielectric , the energy can be concentrated into a small area . A relaxation circuit (Known as RC circuit ) was proposed in which electrodes (tool and work piece ) are immersed in the dielectric like kerosene , and are connected to the capacitor. EDM is a thermoelectric process in which heat energy of a spark is used to remove material from the work piece.

4. Electric Discharge Machining (EDM) is the removal of materials conducting electricity by electrical discharge between two electrodes (work piece electrode and tool electrode ), a dielectric fluid being used in the process. SPARK EROSION MACHINING PROCESS

5. Classification Sinking by EDM Cutting by EDM Grinding by EDM

6. In this case, the metal removal is affected by non stationary electrical discharges which are separated from each other both spatially and temporarily. This process includes those EDM operation in which the average relative speed between the tool and work piece is coincident with the penetration speed in the work piece. (1)Sinking by EDM

7. It includes these machining operations where the work piece is cut off or notched. (2)Cutting by EDM

8. Spark erosion grinding embraces the machining processes made with an electrode rotating around an axis in addition to the normal electrode feed. (3)Grinding by EDM

9. THE END