Apparatus for regulating an electric discharge machining gap

Details Apparatus for regulating an electric discharge machining gap Apparatus for regulating an electric discharge machining gap

1974-07-29

1976-08-03

Reynolds, Bruce A.

Electric heating

Metal heating

Cutting or disintegrating

219 69P, 23515111, 219 69C, B23P 108

Patent

active

039731049

ABSTRACT:
The peak voltage of each discharge pulse is measured and, if the voltage of the pulse exceeds a high threshold value, there is also measured the time between the passing of that value and the moment the pulse voltage thereafter drops below a second lower threshold value. The two measurements are expressed in pulses that are combined, preferably by addition, to provide a regulating value, whose deviation ("error") from a standard value is predicted for a coming period, taking account of recent electrode position change as well as regulating value trend. The sign of the predicted error determines in which direction the electrode drive motor will be energized, but if the predicted error is less than a threshold value no motor energization occurs until the next error prediction. The sense in which the regulation operates is so defined that at a time when the electrodes are not already in relative movement an increase in the regulating value, at least if it persists, causes the electrodes to be moved closer together.

REFERENCES:
patent: 3558844 (1971-01-01), Lobur
patent: 3632942 (1972-01-01), Kondo
patent: 3739137 (1973-06-01), Marendaz
patent: 3775578 (1973-11-01), Verner
patent: 3793502 (1974-02-01), Bell

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