Electric heating – Metal heating – Cutting or disintegrating
Patent
1982-03-16
1984-05-22
Paschall, M. H.
Electric heating
Metal heating
Cutting or disintegrating
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
Dubno Herbert
Inoue-Japax Research Incorporated
Paschall M. H.
Ross Karl F.
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