Process and apparatus for monitoring thermal stresses in an elec

Details Process and apparatus for monitoring thermal stresses in an elec Process and apparatus for monitoring thermal stresses in an elec

1985-07-17

1987-06-23

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, 219 69M, B23H 102, B23H 702

Patent

active

046754911

ABSTRACT:
In a travelling wire EDM apparatus in which a workpiece is cut by an electrode wire by electrical discharges between the wire and the workpiece, a detector circuit detecting each electrical discharge occuring in each sector along the length of the wire in the machining zone. The information detected by the detector circuit is supplied to a circuit simulating the increase of heat of the wire, and the convection of heat into the ambient and into adjoining wire sectors. A control signal for modifying a machining parameter is supplied when the simulator circuit provides an indication of abnormal heating of the wire in one of the wire sectors. Accidental rupture of the wire is thus avoided while assuring that machining is effected at maximum efficiency.

REFERENCES:
patent: 4296302 (1981-10-01), Bell, Jr. et al.
patent: 4329558 (1982-05-01), Martin
patent: 4527034 (1985-07-01), Inoue et al.
patent: 4559432 (1985-12-01), Itoh
patent: 4559434 (1985-12-01), Kinoshita
patent: 4575605 (1986-03-01), Martin

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