Electric heating – Metal heating – Cutting or disintegrating
Patent
1981-03-23
1983-12-27
Paschall, M. H.
Electric heating
Metal heating
Cutting or disintegrating
219 69E, B23P 112
Patent
active
044233027
ABSTRACT:
A drive apparatus for effecting controlled displacement of a movable electrode relative to a counterelectrode along a predetermined axis in an electroerosive machine tool makes use of a feed screw and a feed nut which meshes therewith. The feed screw is rotatably carried by a fixed member, e.g. arm or column, in the machine tool and rotatable about the predetermined axis. The feed nut is rotatably carried by an axial electrode support which is slidably carried by the fixed member. A first unidirectionally rotatable motor drivingly coupled to one of the feed screw and the feed nut is energized by a train of drive pulses of variable frequency for incrementally rotating the feed screw or the feed nut to incrementally advance the electrode support along the predetermined axis in a first direction such as to move the movable electrode towards the counterelectrode. A second unidirectionally rotatable motor drivingly coupled to the nut or screw is energized with a fixed power supply or a train of drive pulses of a fixed frequency for rotating it to retract the electrode support. With the two motors simultaneously energized in the manner described, the controlled displacement of the movable electrode is effected with a minimum influence of inertia and backlash of the mechanical system and with an extremely high speed of response and positioning precision.
REFERENCES:
patent: 2807706 (1957-09-01), Oezer
patent: 3125700 (1964-03-01), Bentley et al.
patent: 3657507 (1972-04-01), McNeece
patent: 4263494 (1981-04-01), Martin
Dubno Herbert
Inoue-Japax Research Incorporated
Paschall M. H.
Ross Karl F.
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