EDM method and apparatus with trapezoidized short-duration pulses
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United States of America Patent
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Aug 30, 1988
Issued Date -
N/A
app pub date -
Sep 10, 1986
filing date -
Jul 24, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An EDM method and system in which a DC output is pulsed to produce a succession of discrete, time-spaced, essentially unidirectional current pulses of a short duration not in excess of 10 microseconds for finish-machining a workpiece with a tool electrode across a fluid flooded EDM gap, each of the discrete current pulses having an essentially half-cycle sinusoidally rising and falling current-time characteristic and a peak current in excess of a predetermined current level. According to the invention, a peak current portion of each of the current pulses beyond the predetermined level is clipped to produce a reformed gap current pulse which is substantially square- or trapezoid-edged and has the predetermined current level.
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