Electrode drive and controls for electrochemical machining

Details Electrode drive and controls for electrochemical machining Electrode drive and controls for electrochemical machining

C - Chemistry, Metallurgy

25

F

204/117, 204/86.

C25F 3/02 (2006.01) B23H 3/00 (2006.01)

Patent

CA 1141698

Abstract of the Disclosure: An improved apparatus for electro- lytically removing material from a workpiece includes a plura- lity of electrodes which are movable relative to each other through working strokes. In order to coordinate the movement of the electrodes, they are stopped at one or more predetermined intermediate positions during their working strokes. When all of the electrodes have arrived at intermediate positions, the elect odes are simultaneously moved away from their intermediate positions toward their end of stroke positions. In order to accommodate variations in the rate at which material is electro- lytically removed from a workpiece, the speed of movement of the electrodes and/or the electrical potential established be- tween the electrodes and the workpiece can be varied. Relative- ly large diameter rams connected with the electrodes are supplied with fluid from relatively small diameter piston and cylinder typo pumps. During each electrode working stroke, the piston and cylinder type pumps are driven through a plurality of pumping strokes by reversible driving motors which are con- nected with the pumps by relatively short linear ball screw and nut drive arrangements. To insure that a reversal in the direction of operation of a typical screw and nut drive arrange- ment does not occur during the final portion of a working stroke, each of the electrodes is stopped at an intermediate position shortly before the end of its working stroke. The piston and cyl- inder type pumps are then returned to beginning of pumping stroke positions and are then simultaneously operated through a portion of a pumping stroke to effect movement of each of the electrodes to its end of working stroke position. Accurate positioning of the electrodes relative to each other and the workpiece is promoted by the utilization of a plurality of devices such as photoelectric sensors which detect when an electrode is in a predetermined position. To facilitate accurate placement of the electrodes relative to the workpiece, the electrodes can be adjusted by wedge type bearings along either one of two axes extending perpendicular to each other and to central axes of the electrodes. -2-

301099

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