Pulse generator for electroerosive processing

Details Pulse generator for electroerosive processing Pulse generator for electroerosive processing

1977-08-16

1979-08-07

Reynolds, Bruce A.

Electric heating

Metal heating

Cutting or disintegrating

219 69W, 323 23, B23P 108

Patent

active

041638875

ABSTRACT:
A generator for machining by means of electrical discharges between a tool electrode and a workpiece electrode. The generator consists of a main voltage source connected between the tool electrode and the workpiece electrode through an improved switching circuit which is activated by an adjustable oscillator. The switching circuit delivers short pulses of high pulse current and consists of a plurality of identical impulse amplification stages. A first one of these impulse amplification stages drives all the additional ones. Power transistors are used. With a base current regulating system, the turn-off delay of these power transistors is eliminated by keeping them far away from saturation. Resistance-capacitance and resistance-inductance elements and a special cabling are used to eliminate certain impulse transmission problems.

REFERENCES:
patent: 3292040 (1966-12-01), Ullmann et al.
patent: 3492503 (1970-01-01), Bose
patent: 3654489 (1972-04-01), Knapton
patent: 3815030 (1974-06-01), Morrison
patent: 3927365 (1975-12-01), Kodama
patent: 3987269 (1976-10-01), Inoue
patent: 4015192 (1977-03-01), Koyanagi
Kravchenko, A Thyratrox Pulse Generator for Spark Machining, Electrochemistry in Industrial Processing and Biology, No. 6, Nov./Dec., 1975, pp. 83-85.

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