Method and apparatus for supplying power for electric discharge

Details Method and apparatus for supplying power for electric discharge Method and apparatus for supplying power for electric discharge

1993-08-25

1994-09-06

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

B23H 102

Patent

active

053450531

ABSTRACT:
A method of and apparatus for supplying power during EDMing in which reverse polarity pulses are used to inhibit electrolytic activity. A main voltage pulse of a certain polarity and an auxiliary voltage pulse, preceding the main voltage pulse of the same or reverse polarity, are applied across a machining gap during the on time of a main gate signal and until a discharge is detected. The ratio of the number of auxiliary voltage pulses of regular polarity to those of reverse polarity is set to a desired value depending upon machining conditions, to thereby obtain a good compromise between the conflicting requirements of achieving a high machining rate, while inhibiting undesirable electrolytic activity.

REFERENCES:
patent: 4347425 (1982-08-01), Obara
patent: 4678884 (1987-07-01), Obara et al.
patent: 4720616 (1988-01-01), Inoue
patent: 5064984 (1991-11-01), Yamamoto et al.

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