Polarity reversal pulsing method and apparatus for EDM
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United States of America Patent
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Jan 19, 1988
Grant Date -
N/A
app pub date -
Aug 21, 1985
filing date -
Aug 21, 1984
priority date (Note) -
Expired
status (Latency Note)
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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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