EDM Method and apparatus with a continuous DC supply using stray

Electric heating – Metal heating – Cutting or disintegrating

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219 69G, 219 69P, B23P 108

Patent

active

044503377

ABSTRACT:
An EDM method and apparatus in which a continuous DC voltage is applied across the EDM gap via a first switch held conductive, and a stray capacitance distributed in the supply circuit including the EDM gap is recurrently charged and discharged to produce successive electrical discharges between the tool electrode and the workpiece. A gap sensor monitors the magnitude of high-frequency signals contained in the successive discharges and, when the sensed magnitude falls below a threshold level, provides a trigger signal which is used to turn on a second switch connected across the EDM gap in parallel with the DC source to short-circuit the EDM gap, thereby terminating the successive discharges. The conducting second switch serves to discharge the residual charge on the stray capacitance and prevents charge build-up thereon. Then the first switch may be turned off. The time interval in which the gap is free from current flow continues until the first switch is turned on following the turn-off of the second switch. The cycle is repeated.

REFERENCES:
patent: 3956609 (1976-05-01), Marendaz
patent: 4237370 (1980-12-01), Ullmann
patent: 4338504 (1982-07-01), Gray

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