Traveling wire EDM apparatus with automatic wire rethreading mec

Details Traveling wire EDM apparatus with automatic wire rethreading mec Traveling wire EDM apparatus with automatic wire rethreading mec

1980-06-12

1982-09-21

Reynolds, B. A.

Electric heating

Metal heating

Cutting or disintegrating

219 69M, B23P 112

Patent

active

043508642

ABSTRACT:
An automatic wire rethreading mechanism for traveling wire EDM apparatus wherein the workpiece is cut by electrical discharges by an electrode in the form of a wire, comprising a mechanism for automatically threading the electrode wire through a pre-drilled hole in the workpiece, the automatic wire threading mechanism being adapted to thread the wire at the beginning of a cutting operation and any time the electrode wire is ruptured in the course of a cutting operation. The position of the pre-drilled hole is memorized, as well as the relative position of the wire and workpiece at the instant of wire rupture. The workpiece and the electrode wire holders are returned to their start position along a predetermined path and, after threading the wire again through the pre-drilled hole, the electrode wire and the workpiece are displaced relative to each other, without applying electrical discharges between the electrodes, along the already cut path until the wire electrode and the workpiece are positioned relative to each other in the same position as occupied when the electrode wire ruptured.

REFERENCES:
patent: 3636296 (1972-01-01), Semin
patent: 3891819 (1975-06-01), Ullmann et al.
patent: 3987270 (1976-10-01), Ullmann et al.
patent: 4205212 (1980-05-01), Ullmann et al.
patent: 4242558 (1980-12-01), Kunze
patent: 4242559 (1980-12-01), Roemer et al.

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