Method of forming metallic product

Details Method of forming metallic product Method of forming metallic product

1990-05-23

1991-10-08

Crane, Daniel C.

Metal deforming

With use of control means energized in response to activator...

Metal deforming by use of roller or roller-like tool element

72318, 7234296, 219150R, 2988843, B21J 508

Patent

active

050543016

ABSTRACT:
A metallic product is formed by an electric upsetter having anvil and clamp electrodes. The anvil electrode is made of a material having a relatively small thermal conductivity. A rod-shaped blank of a metallic material is placed between the anvil and clamp electrodes. Then, an electric current is passed through the rod-shaped blank to heat the same. The rod-shaped blank is pushed toward the anvil electrode under a constant force to thicken an end of the rod-shaped blank which is held against the anvil electrode. The electric current passed through the rod-shaped blank is controlled such that the rod-shaped blank is pushed at a predetermined speed depending on a displacement by which the rod-shaped blank is pushed toward the anvil electrode, thereby producing a preliminary product with the thickened end. The preliminary product is subsequently formed into an engine valve by closed-die forging.

REFERENCES:
patent: 2836706 (1958-05-01), Cavanagh
patent: 3728887 (1973-04-01), Bachmann
patent: 4151732 (1979-05-01), Hofstede
patent: 4263799 (1981-04-01), Motizuki
patent: 4741080 (1988-05-01), Larson et al.

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