Travelling wire EDM apparatus with monitoring of the number of e

Details Travelling wire EDM apparatus with monitoring of the number of e Travelling wire EDM apparatus with monitoring of the number of e

1985-10-16

1987-09-01

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, B23H 704, B23H 102

Patent

active

046910891

ABSTRACT:
In a travelling wire EDM apparatus, the electrode wire is divided into a plurality of sectors disposed along the active length of the electrode wire, and the numbers of electrical discharges occurring in each of the sectors from a predetermined starting time is detected. Those numbers are compared to reference values to determine the difference between the numbers of detected electrical discharges and corresponding reference values. In its simplest form, all the reference values are equal to the average value of the number of electrical discharges per sector. If one or more of the differences is higher than a predetermined threshold, an adequate modification of the machining parameters is effected as a function of the difference.

REFERENCES:
patent: 3816692 (1974-06-01), Ratmansky
patent: 3997753 (1976-12-01), Inoue
patent: 4321451 (1982-03-01), Inoue
patent: 4329558 (1982-05-01), Martin
patent: 4559432 (1985-12-01), Itoh
patent: 4575605 (1986-03-01), Martin
English translation of Japan Patent Document 53-64,899, published 11/1976.

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