ELECTRONIC DISCHARGE MACHINING

                      ELECTRICAL DISCHARGE MACHINING

Process 

among the thermal made of machining electrical discharge making id mainly a technique used for the manufacture of a multitude of over changing as a unit job in small batches.

          the basic concepts of editing process are cracking out of the material affected by the sudden stopping of the electron beam by the solid metal surface of the anode. the portion of the anode facing the direct electrical pulses reaches the building point even the case of the media lying pulse the rate of temperature  increase in the tens of million of a degree per second

Operating Principal

The edm process involves finite discrete parodist spark between tool electrode separated  by a thin film of liquid dielectric that causes the removal of work material

1. spark gap

2. tool wear

3. roughing electrode

spark gap---- spark gap produce more than the clearance was more and the metal removal but less finishing we get on the work-piece.

tool wear----- if the spark gap is more than the tool wear is more and the spark gap is less than low mrr and less tool wear.

roughing  electrode---- roughing electrodes means spark gap is more and metal removal is also more

finishing electrode---- if we give less spark between and work-piece the mrr of the m/c we get less but the mrr is more that is called finishing electrode

size of cavity=electrode size+2/spark gap

electrode size= cavity size-2/,spark gap

4. finishing  electrode