Process and mechanism for threading the electrode wire of an EDM

Details Process and mechanism for threading the electrode wire of an EDM Process and mechanism for threading the electrode wire of an EDM

1985-08-27

1987-03-24

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 69W, B23P 108

Patent

active

046527168

ABSTRACT:
A method and apparatus for threading the electrode wire of a travelling wire EDM apparatus through an aperture in a workpiece. Prior to automatically threading the wire through the aperture in the workpiece, the wire is continuously straightened by pulling longitudinally on the wire, and the wire is passed through a guide tube and through a nozzle to which fluid under pressure is supplied for forming a jet stream at the outlet of the nozzle. Prior to a threading or rethreading operation the wire is cut off proximate to the outlet of the nozzle. The nozzle outlet is brought in close proximity to the aperture in the workpiece and the jet stream is aimed at the aperture in the workpiece for guiding the wire through the aperture, while being maintained coaxially by the jet stream. The consecutive steps for feeding the end of the wire through an aperture in the workpiece are effected in sequence for initial threading of the wire through a pre-drilled stating hole in the workpiece, or for rethreading the wire through a cut in the workpiece after accidental rupture of the wire during a cutting operation.

REFERENCES:
patent: 3987270 (1976-10-01), Ullmann et al.
patent: 4298782 (1981-11-01), Wavre
patent: 4414458 (1983-11-01), Nomura
patent: 4495393 (1985-01-01), Janicke

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