Process and apparatus for high frequency discharge shaping of a workpiece by means of a rectangular bipolar pulsating voltage

摘要

A method and apparatus for electrical discharge machining are disclosed. The method includes the use of a bipolar pulsating voltage to improve the quality of a discharge machining operation. The use of an intermittent AC voltage and an intermittent AC voltage with an intermittent DC voltage interposed during the quiescent periods thereof is also disclosed. A water bath for discharge machining is disclosed, as is a novel circuit for producing bipolar pulsating power and a novel apparatus for combining a plurality of such power supplies and insuring that all output power is maintained in the same phase. Electrode shielding and automatic drive methods and apparatus are disclosed as is a novel capacitive electrode coupling technique.