Method and apparatus for measuring the rate of wear of an EDM el

Details Method and apparatus for measuring the rate of wear of an EDM el Method and apparatus for measuring the rate of wear of an EDM el

1986-03-05

1987-10-13

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

219 69M, 219 69C, B23H 102

Patent

active

047000384

ABSTRACT:
The electrode wear rate is determined by using two detectors and a clock to measure the time taken for the voltage across the gap to drop between two preset values which are chosen to measure the speed in which the voltage drops from the no load voltage to the cutting voltage. This value of time is used by an arithmetic circuit which uses an exponential equation to determine the amount of material removed in a single discharge. A second arithmetic circuit is used to sum up the amount of electrode wear taking place and to supply the pulse generator with a control signal for adjusting the pulse generator as a function of the electrode wear rate.

REFERENCES:
patent: 3739137 (1973-06-01), Marendaz
patent: 3892936 (1975-07-01), Kobayashi et al.
patent: 4335294 (1982-06-01), Inoue
patent: 4436976 (1984-03-01), Inoue
patent: 4527034 (1985-07-01), Inoue et al.
patent: 4539458 (1985-09-01), Inoue
"Predicting the Required Working Length of Parallel EDM Electrodes", Klados, pp. 8-16 EDM Digest, Jan./Feb. 1984, vol. VI, No. 1.
"New Developments in EDM Presented at ISEM 7", Wijers, pp. 20-26 EDM Digest, Jan./Feb. 1984, vol. VI, No. 1.
"How the EDM Process Can be Improved", Mironoff pp. 8-15, 25 EDM Digest, Sep./Oct. 1984, Vol. VI, No. 5.

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