Device for straightening and cutting metallic wire

Details Device for straightening and cutting metallic wire Device for straightening and cutting metallic wire

1986-09-15

1988-05-10

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

140139, 140147, 219155, B23H 710, B21F 102, B21F 1100, C21D 962

Patent

active

047437308

ABSTRACT:
A device installed on a traveling wire EDM apparatus for straightening the electrode wire and providing the electrode wire with a needle point end for facilitating manual threading of the electrode wire through close tolerance closed wire guide members. The device takes the form of a pair of spaced-apart current conductive metallic studs, a heat shield being located at some intermediate portion between the metallic studs. The metallic studs are connected across a source of electrical power. A length of wire proximate its end is held manually over the metallic studs, with an intermediate portion of the wire disposed within the heat shield, and a pull is manually exerted on the wire beyond the metallic studs while the wire is being heated by electrical current flow through the wire between the two metallic studs. The wire is heat-straightened and ruptures at its portion within the heat shield, with sharp needle point ends being formed at the point of rupture.

REFERENCES:
patent: 3606778 (1971-09-01), Bomberger
patent: 3912899 (1975-10-01), Lehmann et al.
patent: 4367392 (1983-01-01), Girardin
patent: 4379959 (1983-04-01), Inoue
patent: 4427870 (1984-01-01), Inoue
patent: 4547647 (1985-10-01), Schneider

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