Breakthrough detection means for electric discharge machining ap

Details Breakthrough detection means for electric discharge machining ap Breakthrough detection means for electric discharge machining ap

1982-02-09

1983-11-15

Reynolds, B. A.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, 219 69S, B23P 102, B23P 114

Patent

active

044157916

ABSTRACT:
An electric discharge machining device is provided with detecting means operable to determine when a particular machining operation, e.g. the formation of a through-hole in a workpiece, has been completed. In all cases, the position of the electrode is monitored to determine the present machining depth, and whether this depth is the largest depth thus far achieved.
The detection of an increasing machining depth is coupled with at least one other detection factor, such as electrode speed, machining fluid flow or machining fluid pressure, such that the penetration of the electrode through the workpiece can be positively sensed. In response to such an indication, a stop signal is output to the power supply unit, to end the machining operation.

REFERENCES:
patent: 3609279 (1971-09-01), Giesbrecht et al.
patent: 3659070 (1972-04-01), Ioffe et al.
patent: 3748427 (1973-07-01), Baldwin
patent: 4107504 (1978-08-01), Dinsdale
patent: 4146770 (1979-03-01), Dinsdale et al.
patent: 4229635 (1980-10-01), Dinsdale

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