Method of threading electrode through EDM guide

Electric heating – Metal heating – Cutting or disintegrating

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Details

219 6917, B23H 710

Patent

active

050031481

ABSTRACT:
A wire guiding device for electrical discharge machines (EDM) for easing the threading of wire through the wire guiding assembly. The wire guiding device includes a body wherethrough a longitudinal wire hole is defined having first and second openings. A cavity is located in the body and communicates with the wire hole along a longitudinal communication portion. The cavity is channel-shaped including a planar valley portion and two walls. The planar valley portion intersects the wire hole and forms the longitudinal communication portion and also forms an arcuate groove along the valley portion and in the body. A wear-resistant member is fixed in a bore near one opening of the wire hole and a non-conductive cap is fixed thereover and shields the wear-resistant member and the wire guiding device from electroerosion. A liquid retention chamber is attached to the wire guiding assembly and at least partially surrounds the wire guiding device and has a hole substantially coaxially arranged with the wire hole. Pressurized liquid within the chamber discharges through the chamber hole and the wire is also received through the hole. A door is provided on the chamber and is selectively detachably attached thereto and provides access to the interior of the chamber and to the cavity.

REFERENCES:
patent: 3775580 (1973-11-01), Scherbaum
patent: 4539459 (1985-09-01), Yamagata
patent: 4564431 (1986-01-01), Miyano
patent: 4608478 (1986-08-01), Aso et al.
patent: 4613740 (1986-09-01), Ichikawa
patent: 4698476 (1987-10-01), Yamamoto et al.
patent: 4803328 (1989-02-01), Obara
patent: 4833291 (1989-05-01), Aso et al.

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