Electric heating – Metal heating – Cutting or disintegrating
Patent
1993-04-29
1994-10-04
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6918, B23H 102, B23H 720
Patent
active
053528590
ABSTRACT:
An adaptive apparatus for controlling the discharge current comprises a circuit for sensing the gap voltage and a circuit for sensing the gap current. Based upon these sensed conditions at the gap, the waveform of the discharge current is detected. The waveform of the current is compared to several reference levels at certain times during the waveform in order to determine the condition at the gap. The reference levels may be varied in accordance with the machining method, such as in accordance with the peak value of current. The off times for the pulses are then varied according to the conditions at the gap. The pulses of discharge current are therefore controlled in order to provide the optimal machining rate and an improved workpiece surface finish while reducing arc discharges.
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Kaneko Yuji
Nabekura Nobuyoshi
Evans Geoffrey S.
Sodick Co. Ltd.
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