Waveform control device for electrical discharge machining apparatus
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United States of America Patent
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-
Jan 21, 1992
Grant Date -
N/A
app pub date -
Jun 14, 1990
filing date -
Aug 8, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A waveform control device for an electrical discharge machine apparatus which supplies current pulses to the gap between an electrode and a workpiece for machining of the workpiece. A first D.C. source, which supplies at least a part of a voltage that is applied across the gap, is connected in parallel with first and second circuits comprising a series connection of a switch and a diode. Connected between a first and second series circuit is a switched conductive circuit which, together with an auxiliary D.C. source, maintains the current flow at a base current level. Control of operation of the switches in the first and second circuits permit a controlled discharge of current across the gap while permitting the output voltage to be clamped at a safe level. A plurality of inductive circuits may be used to provide selectivity, where the inductances are different and to provide further control of the discharge current shape. A variable inductance, whose value is proportional to the output peak current, may be used to control current ripple.
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