Electric heating – Metal heating – Cutting or disintegrating
Patent
1973-05-22
1976-03-09
Reynolds, Bruce A.
Electric heating
Metal heating
Cutting or disintegrating
219 69C, B23P 108
Patent
active
RE0287342
ABSTRACT:
An EDM (electric-discharge machining) power supply system for generating self-adaptive discharge pulses wherein an electrode is spacedly juxtaposed with a workpiece across a discharge gap while a dielectric liquid coolant is passed therethrough. The electrode and the workpiece are relatively displaced during the machining of the latter to maintain the gap spacing generally constant via a servomechanism. According to the invention, there is applied across the electrode and the workpiece a direct-current arc-striking voltage sufficient to initiate discharge across the gap while permitting the voltage to build up thereacross to a level constituting a function of conductivity characteristic of the gap and to decay with a discharge across the gap. An analog signal is derived across the gap and represents the voltage buildup and decay thereacross. Machining current flow through the gap across the electrode and the workpiece is triggered by a digital signal derived when the analog signal exceeds a threshold value and initiation of the discharge is induced by the arc-striking voltage. A second digital condition terminates the machining current flow which is controlled by a semiconductive power switch turned on and off instantaneously in dependence upon the digital conditions. A limited current high-voltage source is connected in a closed loop circuit with the electrode, the workpiece and the gap to provide the voltage buildup across the latter, while the voltage across the gap is detected by a voltage divider or the like and the output of this voltage divider is supplied via an integrating circuit in a squaring or gating-type logic device, e.g., a Schmitt trigger capable of producing the digital output for triggering the semiconductive power switch of the machining-current power supply.
REFERENCES:
patent: 2835785 (1961-05-01), Williams
patent: 2979639 (1961-04-01), Williams et al.
patent: 3052817 (1962-09-01), Branken
patent: 3292040 (1966-12-01), Ullmann et al.
patent: 3419754 (1968-12-01), Schienholt
Dubno Herbert
Reynolds Bruce A.
Ross Karl F.
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