Method of electrical discharge machining control by monitoring g

Details Method of electrical discharge machining control by monitoring g Method of electrical discharge machining control by monitoring g

1992-10-09

1994-12-06

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6917, 219 6919, B23H 102, B23H 718

Patent

active

053713346

ABSTRACT:
A pair of electrodes are spaced from one another so as to define a gap. One of the electrodes constitutes a workpiece to be machined and the other electrode constitutes a machining tool. To machine the workpiece, groups of electrical discharges are generated between the electrodes. The different groups are separated by pauses which are free of discharges, and the electrical resistance of the electrode gap is measured during the pauses. When the resistance decreases to a critical value, the lengths of the pauses and the spacing between the electrodes are increased until the resistance begins to increase from the critical value. Electrical discharge activity is continued during this time. In the event that these measures fail to cause an increase in the resistance so that the critical value is obtained during several pauses, the electrical discharges are stopped and the machining electrode is abruptly shifted away from the workpiece electrode. The distance moved by the machining electrode is proportional to the frequency of repetition of the critical value and to the period of time for which the resistance remains at such value.

REFERENCES:
patent: 3018411 (1962-01-01), Webb
patent: 3609281 (1971-09-01), Kauffman
patent: 3699301 (1972-10-01), Losey
patent: 4251706 (1981-02-01), Frei et al.
patent: 4367400 (1983-01-01), Otto et al.
patent: 4376880 (1983-03-01), Inoue
patent: 4798929 (1989-01-01), Itoh
patent: 4822970 (1989-04-01), Levy et al.

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