EDM control system to maximize efficiency by controlling the gap

Details EDM control system to maximize efficiency by controlling the gap EDM control system to maximize efficiency by controlling the gap

1985-03-13

1987-10-27

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, 219 69G, B23H 102, B23H 718

Patent

active

047031441

ABSTRACT:
An electric discharge machine has a CPU that controls a switching element that supplies a pulse voltage to the gap between an electrode (which may be a wire electrode) and a workpiece. The CPU is able to determine the average pre-discharge time (the average time between the turning on of the switching element and the start of each electrical discharge) based on the sampling time interval and the counted number of discharges that occurred during the sampling time interval, by turning off the switching element at a set time after the start of each electrical discharge, and turning the switching element on again after a longer set time has elapsed from the start of each electrical discharge. The average gap voltage and average gap current are then calculated and displayed from this data. The feeding of the electrode and the workpiece relative to each other is controlled to reduce the difference between the counted number of discharges that occurred during the sampling time interval and a calculated desired number of discharges.

REFERENCES:
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patent: 4559434 (1985-12-01), Kinoshita
"Micro Computer Controlled Spark-Erosion" by Heavelman et al. in the Sep./Oct. 1980 issue of EDM Digest.

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