Method of fabrication of headed-shank parts from high-strength t

Details Method of fabrication of headed-shank parts from high-strength t Method of fabrication of headed-shank parts from high-strength t

1975-10-24

1977-05-17

Combs, E. M.

B21K 146, B21K 158

Patent

active

040232255

ABSTRACT:
A method of fabricating headed-shank parts from high-strength two-phase titanium alloys characterized by using an oxalate coating capable of forming a fine-crystalline salt film, cold shaping the shank by reduction, and simultaneous heading and rolling the shank and the radius under the head. The shank is reduced and headed at a speed of 0.5 - 1.0 m/s. The use of the oxalate coating and of the cold-shaping speeds within the above-mentioned limits has made it possible to use automatic cold-heading machines thus raising the productivity of the process 20 - 30 times and producing parts of a higher quality. The method can be widely used for making such parts as rivets, bolts, screws, rivet-bolts and core rivets.

REFERENCES:
patent: 2637672 (1953-05-01), Losco et al.
patent: 2799027 (1957-07-01), Hatebur
patent: 3298725 (1967-01-01), Boteler
patent: 3635068 (1972-01-01), Watmough et al.
patent: 3867208 (1975-02-01), Grekov et al.
Fastener Technical Section, pp. 8, 9.

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