Electric heating – Metal heating – Cutting or disintegrating
Patent
1982-01-12
1984-03-27
Reynolds, B. A.
Electric heating
Metal heating
Cutting or disintegrating
204222, 219 69G, B23P 114
Patent
active
044396597
ABSTRACT:
An improved electrode feed system for use in effecting electrical machining between a working electrode and a workpiece electrode across a machining gap has a quick-response electrode retraction and reciprocation capability. The movable electrode is securely supported by an axially movable machining head into which a feed screw extends, the latter being driven by a servo motor responsive via a control circuit to the progress of machining in the gap. In the machining head, the feed screw is in mesh with a feed nut which is restrained from rotation for axially moving the head when the feed screw is rotated by the gap-responsive servo motor, thereby displacing the movable electrode as machining proceeds. The improved system includes a cylinder formed within the machining head and the feed nut is slidably received in the cylinder for axial movement relative thereto, the feed nut being constructed and arranged to define a pair of separate chambers in the cylinder. A plunger-type reciprocation pump is provided outside the machining head to alternately fluid-pressurize the two chambers in the cylinder to axially reciprocate the machining head. The feed nut is spring-biased to a neutral position. In the reciprocation pump, an electric drive motor is rotated alternately in opposite directions to cyclically reciprocate via a feed screw and nut a movable cylinder on a fixed position, whereby to alternately pressurize the respective chambers in the machining head, and thereby axially reciprocate the latter.
REFERENCES:
patent: 3271283 (1966-09-01), Clifford et al.
patent: 3616433 (1971-10-01), Williams
patent: 3801487 (1974-04-01), Pahl
patent: 4229635 (1980-10-01), Dinsdale
patent: 4338504 (1982-07-01), Gray
Dubno Herbert
Japax Incorporated
Keve Alfred S.
Reynolds B. A.
Ross Karl F.
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