Method and apparatus for controlling electric discharge machinin

Details Method and apparatus for controlling electric discharge machinin Method and apparatus for controlling electric discharge machinin

1993-12-03

1995-06-27

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6913, 395 61, 395904, B23H 102, B23H 718, B23H 720, G06F 1900

Patent

active

054282012

ABSTRACT:
A method of and apparatus for controlling electric discharge machining in which a machining gap formed between a tool electrode and a workpiece is maintained at an essentially constant size based on a reference servo-feed voltage, and in which a jump action, for moving a tool electrode up and away from a workpiece, and returning it to a position close to the workpiece is controlled. The reference servo-feed voltage and conditions for jump action are optimally set to required values during machining according to the discharge stability. The discharge stability is obtained by comparing the actual values of characteristics required for specifying gap condition, e.g., waiting time for a discharge to occur, the voltage during the waiting time, discharge frequency, to the corresponding theoretical values. The theoretical values are calculated in part according to given machining conditions. Therefore, even when machining conditions change as machining progresses, jump action and servo-feed action are properly controlled.

REFERENCES:
patent: 5117083 (1992-05-01), Kawamura
patent: 5200905 (1993-04-01), Uemoto et al.
patent: 5216218 (1993-06-01), Sasaki
patent: 5267141 (1993-11-01), Morita et al.

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