Process and apparatus for high frequency discharge shaping of a workpiece by means of a rectangular bipolar pulsating voltage
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYoshiei Niwa
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Abstract
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.
Claims4
A process for high frequency discharge shaping of a work-piece comprising the steps of:
- providing an electrode spaced by a gap from said work-piece;
- generating an intermittent high frequency rectangular bipolar pulsating voltage;
- generating an intermittent DC voltage and applying said DC voltage to said intermittent high frequency rectangular bipolar pulsating voltage during the quiescent period of said intermittent high frequency voltage to form a resultant voltage;
- applying said resultant voltage across said gap between said electrode and said work-piece for accomplishing said discharge shaping whereby a black film is formed on the surface of said electrode to retard the consumption of said electrode and whereby the accuracy in the shape of the work-piece is improved.
Dependencies are inferred from the claim text.