Method of automatically feeding wire to an electric discharge ma

Details Method of automatically feeding wire to an electric discharge ma Method of automatically feeding wire to an electric discharge ma

1989-11-24

1991-12-31

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6917, B23H 710

Patent

active

050774573

ABSTRACT:
A method of automatically feeding wire to an electric discharge machine, wherein when the wire electrode is broken during when the wire electrode is effecting the discharge machining for the work according to a predetermined machining profile, the wire electrode is passed through a worked slit via a feed pipe at a position of the worked slit at the frontmost portion of machining for the work by the wire electrode or at a position which is slightly returned back from the frontmost portion along the machining profile without returning the wire feed pipe to the position of start hole that is perforated in advance in the work, and the discharge machining is executed again by the wire electrode for the work making it possible to greatly improve the machining efficiency. Prior to passing the wire electrode in the worked slit formed in the work, furthermore, an electric current is supplied to the wire electrode to anneal it in order to remove internal stress from the wire electrode and to extent it straight, such that the wire electrode can be inserted in the worked slit of the work easily and quickly.

REFERENCES:
patent: 4338505 (1982-07-01), Katsube et al.
patent: 4598189 (1986-07-01), Inoue et al.
patent: 4652716 (1987-03-01), Schneider et al.
patent: 4778972 (1988-10-01), Josserand
Wire-Cut Electric Discharge Machining Apparatus (Patent Abstract), vol. 10, No. 134 (M-479) (2191) 5/17/1986 & Jp-A-60 259330, Mitsubishi Denki K. K.

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