Electric heating – Metal heating – Cutting or disintegrating
Patent
1985-02-15
1987-01-06
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
219 69C, B23H 102, B23H 718
Patent
active
046348271
ABSTRACT:
Electrical discharge machining (EDM) apparatus includes an arc protection circuit which monitors the values of the ignition voltages applied across the gap between an electrode and a workpiece. A signal conditioning circuit includes a peak detector and averaging circuit conditions the voltage appearing across the gap and the arc protection circuit compares the value of the conditioned signal to the value of one of two reference voltage signals depending on whether the gap ignition voltages are increasing or decreasing. When the ignition voltages have decreased below the first reference level, the arc protection circuit provides a first control signal which causes a servo drive mechanism to increase the distance between the electrode and the workpiece. The first control signal also causes a pulse generator circuit to increase the off time between successive electrical discharges. When the ignition voltages have subsequently increased above a second, lower reference level the arc protector circuit provides a second control signal. The second control signal causes the servo drive mechanism to return to its programmed cutting position and the pulse generator circuit to return to its normal operating mode.
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Jefferson Eric
Purrett John J.
Syria Roland L.
Evans Geoffrey S.
Pellinen A. D.
Xermac, Inc.
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