Device and process for machining by electroerosion

Details Device and process for machining by electroerosion Device and process for machining by electroerosion

1988-02-02

1989-12-19

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

219 6917, 219 6912, B23H 100, B23H 702, B23H 728

Patent

active

048884626

ABSTRACT:
A device for machining by electroerosion has a tool electrode driven in a rotary motion controlled by a servomotor and showing the shape of a solid of revolution around its axis of rotation. A measuring circuit continuously evaluates the degree of contamination of the machining dielectric liquid in relation to a reference value. The measurement is made by a transducer for the instantaneous voltage U.sub.i of each spark and by comparing it to a predetermined value U.sub.b, thus determining the proportion of so-called low-level sparks for which U.sub.i .ltoreq.U.sub.b, a signal being delivered when this proportion surpasses a predetermined threshold, or by a current transductor working during the waiting time preceding the striking of each spark, a signal being delivered when a predetermined current threshold is attained. A servo circuit modulates the rotation speed of the tool electrode as a function of this signal. The detector makes it possible to detect and remedy the appearance of ejected sparks.

REFERENCES:
patent: 4602142 (1986-07-01), Itoh

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