Electric heating – Metal heating – Cutting or disintegrating
Patent
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
Diot Jean-Claude
Girardin Roger
Charmilles Technologies S.A.
Evans Geoffrey S.
Pellinen A. D.
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