EDM Method and apparatus having a gap discharge circuit construc

Details EDM Method and apparatus having a gap discharge circuit construc EDM Method and apparatus having a gap discharge circuit construc

1980-07-24

1982-06-15

Reynolds, Bruce A.

Electric heating

Metal heating

Cutting or disintegrating

219 69P, 219 69C, 328 75, 315227A, 315227R, B23P 108

Patent

active

043352944

ABSTRACT:
An EDM method and apparatus for machining a workpiece electrode with a tool electrode wherein a solid-state switching type EDM generator provides a succession of machining current pulses across a machining gap formed between the electrodes flooded with a liquid dielectric, preferably distilled water or a weakly conductive aqueous liquid, through a gap discharge circuit. The total value of stray capacitances in the gap discharge circuit is limited to be less than 0.01 microfarad, preferably at most 0.005 or 0.001 microfarad, to control a rise of peak current at the leading edge of each individual machining current pulse. The gap current at the leading edge of a pulse may be sensed and discriminated to provide a control signal which acts on the DC power supply to control the output voltage thereof so that the initial rise of peak current may be maintained substantially constant, irrespective of a change in the stray resistance in the gap discharge circuit during a given course of machining operation.

REFERENCES:
patent: 3056065 (1962-09-01), Porterfield
patent: 3292040 (1966-12-01), Ullmann et al.
patent: 4163887 (1979-08-01), Buhler et al.
patent: 4237370 (1980-12-01), Ullman

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