Apparatus and method for electrical discharge machining of a wor

Electric heating – Metal heating – Cutting or disintegrating

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219 69M, 219 69P, B23H 704

Patent

active

047695200

ABSTRACT:
An apparatus and method for preventing machining errors due to changes in the inclination of the electrode wire in a travelling wire EDM apparatus wherein the electrode wire effectuates a cut on a workpiece such that the workpiece is provided with a bevel or taper on its peripheral surface. A test or trigger electrical pulse of low power is applied between the electrode wire and the workpiece in the machining zone and the location where the trigger electrical pulse occurs along the length of the electrode wire in the machining zone is detected and the trigger electrical pulse is converted into a machining electrical discharge, or not converted, according to the speed of feed of the electrode wire at such location while being displaced transversely along the cutting path in the course of a change of inclination of the electrode wire. In this manner, the feed of the wire into the workpiece is continuously and instantaneously adapted to the change in inclination of the electrode wire which permits to maintain the same machining gap all along the length of the electrode wire in the machining zone and to ensure that the electrode wire and the surface machined on the workpiece remain constantly parallel.

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patent: 4575605 (1986-03-01), Martin

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