EDM excels in forming complex geometrical features in hard materials — its widespread use in aerospace and toolmaking industries is notably dependent on this ability. Yet generally speaking, identification of the precise technical requirements for such operations have not been systematically researched, and specific guidance is usually absent on how to proceed in practice.This paper starts by defining the fundamental factors in ‘detail transfer’, and establishes an experimental test procedure designed to separate and measure the individual contributing influences. Loss of detail which could have been transferred to the workpiece occurs through the inevitable degradation of the tool electrode, the effect of the EDM gap, and the overlay of surface roughness produced by the EDM process itself. As the requirement becomes increasingly critical, these factors assume particular relative significance, which is demonstrated and discussed.Finally, the importance of ‘EDM technique’, in terms of arcing avoidance, generator setting, and gap control, is indicated for the achievement of most effective and reliable ‘detail transfer’ in EDM finishing operations.
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- Detail Transfer in EDM Finishing
A. K. Sen
J. R. Crookall
- Palgrave Macmillan UK
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