EDM method and apparatus with trapezoidized short-duration pulse

Details EDM method and apparatus with trapezoidized short-duration pulse EDM method and apparatus with trapezoidized short-duration pulse

1984-07-23

1987-06-09

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

20412943, 204224M, 219 69C, 307268, B23H 102, B23H 302

Patent

active

046721614

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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"Pulse, Digital, and Switching Waveforms", by Millman et al., 03/1966, pp. 236-240.

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