Electric heating – Metal heating – Cutting or disintegrating
Patent
1981-10-14
1985-03-12
Envall, Jr., Roy N.
Electric heating
Metal heating
Cutting or disintegrating
2041296, 204224M, 219 69E, B23P 112
Patent
active
045047219
ABSTRACT:
A method of and apparatus for electroerosively machining a 3D cavity in workpiece, in which a coil is wound on a tool electrode and energized by a current source to produce a magnetic field therein. The magnetic field of flux density in excess of 100 Gauss and preferably not less than 300 Gauss is passed through the ferromagnetic electrode body and applied to the machining gap formed between the tool electrode and the workpiece which are relatively displaced multiaxially under commands of a NC unit to cause the frontal end portion of the tool electrode to sweep in a scanning manner over the workpiece while following a prescribed 3D path to progressively develop the desired cavity electroerosively machined with a succession of electrical discharges affected by the magnetic field. The energization source for the coil includes a control circuit operated by a preprogrammed set of command signals form the NC unit to sequentially modify the magnetic field in accordance with the instantaneous geometrical change of the workpiece area confronting the machining electrode face to maintain the concentration of contaminants in the gap at an optimum level.
REFERENCES:
patent: 3591761 (1971-07-01), Bederman et al.
Dubno Herbert
Envall Jr. Roy N.
Inoue-Japax Research Incorporated
Keve Alfred S.
Ross Karl F.
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