TW-EDM method and apparatus with a ferromagnetic wire electrode
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United States of America Patent
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Oct 11, 1988
Issued Date -
N/A
app pub date -
Aug 19, 1986
filing date -
May 17, 1983
priority date (Note) -
Expired
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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.
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