Electric heating – Metal heating – Cutting or disintegrating
Patent
1992-12-15
1995-01-10
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6913, B23H 102
Patent
active
053809750
ABSTRACT:
An electric discharge machining apparatus of the type in which an electric power for electric discharge is accumulated in capacitors to perform electric discharge machining. To provide an electric discharge machining apparatus in which the manufacturing cost is relatively low, the machining speed is high, the machined surface is not damaged, and the electrode wear is low, a plurality of capacitors are connected in parallel with a machining gap which is formed by a machining electrode and workpiece that face each other. Charging resistors are provided in a charging circuit which is connected between a charging device for charging the capacitors and the capacitors. Switches are connected in series in a discharging circuit which is connected between the capacitors and the machining gap. A control device for controlling the on/off operation of the switches sequentially is provided to performing the electric discharge machining with high speed and high accuracy.
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patent: 4347424 (1982-08-01), Obara
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patent: 4361745 (1982-11-01), Rupert et al.
patent: 4659894 (1987-04-01), Inoue
patent: 4894504 (1990-01-01), Truty
patent: 5083001 (1992-01-01), Kinbara et al.
Imai Yoshihito
Sato Tatsushi
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
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