Electrical discharge machine with an opposite polarity voltage a

Details Electrical discharge machine with an opposite polarity voltage a Electrical discharge machine with an opposite polarity voltage a

1995-09-27

1997-02-18

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6916, 219 6918, B23H 102

Patent

active

056038526

ABSTRACT:
A machining pulse control apparatus applies a first polarity pulse voltage during a machining operation and a second opposite polarity voltage in a machining stop period in which the electrode is moved away from and toward the workpiece during a jump operation. Preferably, the second opposite polarity is applied for a period of time sufficient to maintain the voltage across the machining gap at zero voltage. The amount of direct current voltage applied during the jump operation is adaptively controlled.

REFERENCES:
patent: 4822970 (1989-04-01), Levy et al.
patent: 5117083 (1992-05-01), Kawamura
patent: 5359169 (1994-10-01), Kaneko
patent: 5422455 (1995-06-01), Sato et al.
patent: 5428201 (1995-06-01), Kaneko 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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