TW-EDM method and apparatus with a ferromagnetic wire electrode

Details TW-EDM method and apparatus with a ferromagnetic wire electrode TW-EDM method and apparatus with a ferromagnetic wire electrode

1986-08-19

1988-10-11

Scott, J. R.

Electric heating

Metal heating

Cutting or disintegrating

420 83, B23H 708, C22C 3802

Patent

active

047773375

ABSTRACT:
A traveling-wire electrical discharge machining method and apparatus in which a magnetic property of the traveling electrode wire is detected downstream of the cutting zone to indicate a disturbance of erosive electrical discharges from a predetermined normal mode in the cutting zone. The workpiece is a ferromagnetic material to provide a deposit of such material at a discharge site on the wire in the cutting zone and/or the wire is a ferrous material which preferably consists of 0.05 to 3% by weight one or more rare-earth element and the balance a steel material. The ferrous material may be present as a core wire having a layer of metal or alloy of higher conductivity.

REFERENCES:
patent: 4287404 (1981-09-01), Convers et al.
"Rare Earths Improve Properties", Part I, by Knapp et al., vol. 169, No. 17 of The Iron Age, pp. 129-134, 4/1952.
"Rare Earths Improve Properties", Part II, by Knapp et al., vol. 169, No. 18 of The Iron Age, pp. 140-143, 5/1952.
"Effects of Rare-Earth Additions on Plain-Carbon Steel", by P. G. Barnard, pp. 1-4, 6-14, 22-25, 3/1967.

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