Electrical discharge machine with pulses of both polarities

Details Electrical discharge machine with pulses of both polarities Electrical discharge machine with pulses of both polarities

1994-06-29

1998-05-19

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

B23H 102

Patent

active

057538824

ABSTRACT:
An electrical discharge machine for applying a pulsed voltage to a machining gap between an electrode and a workpiece disposed opposite thereto. An insulating dielectric fluid, comprising an oil or water with compound additive, is disposed in the gap. A positive polarity voltage and an opposite polarity voltage are applied via switches and respective impedances to the machining gap in order to generate a discharge for machining the workpiece. The impedance values may be selectively set and the switching of the voltages controlled such as to apply a positive polarity voltage at the stop time of an opposite polarity pulsed voltage, whereby the average voltage approximates a predetermined value, preferably zero, during the stop time. Voltage control during the stop time will result in high speed and finish, especially for control in connection with a jump operation.

REFERENCES:
patent: 3558998 (1971-01-01), Bertolasi
patent: 4720616 (1988-01-01), Inoue
patent: 4945199 (1990-07-01), Tanaka et al.
patent: 5233148 (1993-08-01), Magara et al.
patent: 5345053 (1994-09-01), Kaneko et al.
patent: 5359169 (1994-10-01), Kaneko
patent: 5416290 (1995-05-01), Magara et al.
M. Weck: "Digitale adaptive Regelung des Funkenerosionsprozesses (Digital adaptive control of the electrical discharge process)", in VDI-Z, Feb. 2, 1989, No. 2, pp. 39-44.

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