Process and apparatus for machining by electrical discharges alo

Details Process and apparatus for machining by electrical discharges alo Process and apparatus for machining by electrical discharges alo

1980-09-22

1982-04-06

Shaw, C. C.

Electric heating

Metal heating

Cutting or disintegrating

219 69V, B23P 112

Patent

active

043237495

ABSTRACT:
The present invention is a process and apparatus for machining an electrode workpiece by electrical discharges, wherein the electrode workpiece and an electrode tool are displaced relative to each other at least in one slant direction disposed at a predetermined angle with the principal axis of feed of one electrode relative to the other, the machining gap between the electrodes is set at a finite value such as to maintain predetermined machining conditions, consecutive machining passes are effected and, at the end of each machining pass, the slant direction of feed is displaced as soon as the amplitude of relative displacement between the electrodes reaches a predetermined limit value, and such limit value is changed from one pass to the next. For the purpose of removing material from the workpiece to an equal depth on all the surfaces of the workpiece in the course of a finish machining pass, the electrodes are displaced relative to each other in slanted directions which are modified as soon as the amplitude of displacement reaches a predetermined limit value whose envelope is a hemisphere. As a result of effecting such consecutive relative displacements of the electrodes in a specific predetermined sequence while maintaining the density of the machining current at an optimum value, the total duration of the finish machining operation is considerably reduced as compared to the prior art.

REFERENCES:
patent: 4135070 (1979-01-01), Pfau et al.
patent: 4150275 (1979-04-01), Wavre

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