Wire electric discharge machining apparatus

Details Wire electric discharge machining apparatus Wire electric discharge machining apparatus

1987-06-03

1989-01-17

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, 219 69D, 219 69G, 219 69S, B23H 702, B23H 102, B23H 110, B23H 714

Patent

active

047989297

ABSTRACT:
A wire electrical discharge machining apparatus capable of adequately ascertaining whether the condition of the machining gap is good or bad without lowering the machining speed while preventing damage to the wire electrode. The apparatus includes a high-frequency voltage source that supplies voltage to the gap between applications of DC voltage machining pulses. In response to the application of high-frequency voltage to the gap a current detector and two voltage comparators detect the degree of electric insulation (i.e. dielectric strength) of the machining liquid in the gap. The condition of the gap is determined based upon comparison between the detected degree of electric insulation and a predetermined reference value. In response to the determined condition of the machining liquid gap conditions such as the machining pulse shape, gap width, wire tension, wire feed rate, rate of renewal of the machining liquid, and resistivity of the machining liquid may be changed.

REFERENCES:
patent: 2979639 (1961-04-01), Williams et al.
patent: 3459916 (1969-08-01), Ferguson
patent: 3609281 (1971-09-01), Kauffman
patent: 4322595 (1982-03-01), Fowell et al.
patent: 4447696 (1984-05-01), Niwa
patent: 4510364 (1985-04-01), Ito
patent: 4731514 (1988-03-01), Naotake et al.

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