Bipolar electrical discharge machine which adjusts voltage polar

Details Bipolar electrical discharge machine which adjusts voltage polar Bipolar electrical discharge machine which adjusts voltage polar

1997-06-27

1999-02-09

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

B23H 102, B23H 716

Patent

active

058697977

ABSTRACT:
An electrical discharge machine for applying a pulsed voltage to a machining gap between an electrode and a workpiece disposed opposite thereto. An insulating dielectric fluid, such as oil or water mixed with a compound additive, is disposed in the gap. A positive polarity voltage and an opposite polarity voltage are applied via switches and respective impedances to the machining gap in order to generate a discharge for machining the workpiece. A pulse having a first polarity is applied to machine the workpiece and a pulse having a second polarity is applied when the first polarity pulse is not applied. The time of application of the second polarity pulse is increased depending upon the number of short-circuits detected between the electrode and the workpiece.

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