Electrical discharge machining apparatus with monitoring circuit

Details Electrical discharge machining apparatus with monitoring circuit Electrical discharge machining apparatus with monitoring circuit

1974-12-04

1977-02-22

Reynolds, Bruce A.

Electric heating

Metal heating

Cutting or disintegrating

B23P 108

Patent

active

040093611

ABSTRACT:
A circuit for controlling an EDM process in which a logical monitoring circuit is used to detect a wrong discharge pulse out of the simultaneous occurrence and absence of certain electrical characteristics in the electrical discharge, as for example the absence of a high frequency component on the discharge voltage, as a criterion for an arc condition, the circuit including an input device connected to supply test signals to the monitoring circuit to simulate a wrong discharge pulse and thus enable checking of the monitoring circuit.

REFERENCES:
patent: 2871410 (1959-01-01), Matulaitis
patent: 2987609 (1961-06-01), Williams et al.
patent: 3301776 (1967-01-01), Hughes
patent: 3539753 (1970-11-01), Ullmann et al.
patent: 3623148 (1971-11-01), Benghauser
patent: 3624337 (1971-11-01), Kauffman
patent: 3673371 (1972-06-01), Smith
patent: 3746930 (1973-07-01), Van Best et al.
patent: 3864541 (1975-02-01), Inoue
patent: 3875374 (1975-04-01), Inoue

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