Polarity reversal pulsing method and apparatus for EDM

Details Polarity reversal pulsing method and apparatus for EDM Polarity reversal pulsing method and apparatus for EDM

1985-08-21

1988-01-19

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

20412943, 204224M, 219 69M, B23H 102

Patent

active

047206160

ABSTRACT:
An EDM method and apparatus in which a succession of machining voltage pulses of regular polarity is applied from a first pulse supply between a tool electrode and a workpiece to produce erosive discharges across the EDM gap in the presence of a water flushing medium. A second pulse supply is also provided to apply one or more voltage pulses of reverse polarity during a time interval between successive machining voltage pulses of regular polarity across the EDM gap. A sensing circuit is provided to respond to a gap open-circuit condition and to provide an output signal representative thereof. The output signal is used to act on the second pulse supply so as to selectively trigger such one or more reverse-polarity pulses, or to temporarily modify the parameters of the reverse-polarity pulse or pulses, upon occurrence of the gap open-circuit condition.

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