Method for cold forging high strength fastener with...

Details Method for cold forging high strength fastener with... Method for cold forging high strength fastener with...

2008-02-05

2010-11-23

Tolan, Edward (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

C470S010000, C470S016000, C470S066000

Reexamination Certificate

active

07836745

ABSTRACT:
The present invention pertains to a method for cold forging high strength fastener with austenitic 300 series material comprising the procedures of initially preparing a raw austenitic shaft and then proceeding through a cold forging method to reduce its diameter for thereafter generating a preliminary shank, which can undertake above ½ force more than the raw shaft; further passing through the following formations of the head, the drilling portion and threads in sequence to build an integral fastener. Thus, the entire cold forging facilitates to fabricate the fastener with high strength and hardness by lower manufacturing cost and with effective corrosion resistance, so as to firmly drill the fastener into objects and increase the screwing security.

REFERENCES:
patent: 3683436 (1972-08-01), Reiland
patent: 4233880 (1980-11-01), Bjorklund et al.
patent: 4718908 (1988-01-01), Wigginton et al.
patent: 4773111 (1988-09-01), Hyner et al.
patent: 5308286 (1994-05-01), Uejima
patent: 5340412 (1994-08-01), Yoshino et al.
patent: 6017274 (2000-01-01), Sherman et al.
patent: 3-9109 (1991-01-01), None
patent: 11-50281 (1999-02-01), None

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