Electro-discharge machining apparatus

Details Electro-discharge machining apparatus Electro-discharge machining apparatus

1990-08-14

1992-02-18

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6913, 219 6917, B23H 102, B23H 726, B23H 904

Patent

active

050896814

ABSTRACT:
An electro-discharge machining apparatus includes an electrode carrier on which there are mounted a plurality of separate electrodes. A circuit for each electrode applies a high voltage discharge initiating pulse followed by an extended lower voltage discharge sustaining pulse to the associated electrode. A gap voltage sampling circuit samples the voltage between the electrode and the workpiece and a "low wins" circuit passes a signal representing the lowest gap voltage as a feedback signal for a servo-actuator which moves the electrode holder towards and away from the workpiece.

REFERENCES:
patent: 2783411 (1957-02-01), Matulaitis
patent: 3504154 (1970-03-01), Marcolini
patent: 3509305 (1970-04-01), Bertolasi
patent: 3655936 (1972-04-01), Saito et al.
patent: 3655937 (1972-04-01), Ullmann et al.
patent: 4221952 (1980-09-01), Sato et al.
patent: 4233485 (1980-11-01), Sato et al.
patent: 4287403 (1981-09-01), Sato et al.
patent: 4441004 (1984-04-01), Inoue
patent: 4683364 (1987-07-01), Anderson

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