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dies, fixtures parts.
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Definition of Electrical
Discharge Machining (EDM)
In the Electrical
Discharge Machining process (EDM), metal is removed by generating high
frequency sparks through a small gap filled with a dielectric fluid.
This technique allows to machine complicated shapes in hard metals,
including refractory alloys. A necessary condition for achieving a
good surface finish is a well controlled gap between the electrode
(tool) and the work piece. The sparking gap ranges from about 10 to
100 microns, respectively for finish and
roughing. The control problem is therefore the regulation of the gap,
that is measured only indirectly by processing some secondary signals
like ignition delays, average gap voltage, etc..