Electric discharge machine power supply circuit

Details Electric discharge machine power supply circuit Electric discharge machine power supply circuit

1992-12-04

1995-05-16

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

B23H 102

Patent

active

054162904

ABSTRACT:
An electrical discharge machine equipped with a machining gap voltage application circuit having switching circuits capable of switching between a first voltage application state wherein one terminal of a first direct-current power supply is connected to an electrode and the other terminal thereof is connected to a workpiece and a first voltage is applied to the gap, a second voltage application state wherein the one terminal is connected to the workpiece and the other terminal is connected to the electrode and a second voltage is applied to the gap, and a second voltage application reset state where the second voltage is not applied to the gap. The switching circuits are operative during a first period of time when the second voltage application state and a second voltage application reset state alternate with each other, and a second period of time when the first voltage application state exists, the first and second periods are repeated in a predetermined sequence.

REFERENCES:
patent: 4678884 (1987-07-01), Obara et al.
patent: 5064984 (1991-11-01), Yamamoto et al.

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