Method of forming a fastener

Details Method of forming a fastener Method of forming a fastener

1997-09-02

2000-01-25

Tolan, Ed

Threaded, headed fastener, or washer making: process and apparat

Process

Making externally threaded fastener, e.g., screw or bolt

470 8, 470 11, 470 31, B21H 302

Patent

active

060172746

ABSTRACT:
In a first embodiment, a method for forming a hardened fastener having a hardened fastener head. Alloys made of cobalt, nickel, chromium, and molybdenum have very high hardnesses while maintaining ductility. Metals conforming to the chemistry of AMS 5844 and AMS 5842 are disclosed as the preferred materials. These hardnesses are also maintained at high temperatures. In order to form a head upon such materials, a fastener blank is first initially hardened by cold reduction twenty to thirty percent (20%-30%). A fastener head is then formed in the fastener blank by additional cold forging. The remaining shank portion of the fastener blank is cold worked in a third process with the entire three-part cold forging process cold reducing the material forty-eight to fifty percent (48%-50%). Additional hardness may be obtained by heating the material in a temperature range between ca. 1200.degree. F. and 1300.degree. F. In another embodiment, the head may be hot forged for otherwise unworkable materials or alternative hardening techniques may be used prior to cold forging the fastener head. A fastener so formed by the methods set forth herein is also contemplated as being within the scope of the present invention. In still another embodiment a nickel-based alloy is preliminarily heat treated to 180,000 psi and thereafter cold worked using the method of the invention to obtain a high strength fastener.

REFERENCES:
patent: 2030290 (1936-02-01), Friedman
patent: 2763370 (1956-09-01), Kriedler
patent: 3072933 (1963-01-01), Carlson
patent: 3767385 (1973-10-01), Slaney
patent: 3926687 (1975-12-01), Gondo et al.
patent: 4045644 (1977-08-01), Shafer et al.
patent: 4296512 (1981-10-01), Kilinskas et al.
patent: 4563222 (1986-01-01), Sugita et al.
patent: 4649728 (1987-03-01), LaCount et al.
patent: 4909860 (1990-03-01), England et al.
patent: 5342459 (1994-08-01), Klemp et al.
patent: 5360496 (1994-11-01), Kuhlman et al.
patent: 5374323 (1994-12-01), Kuhlman et al.
patent: 5453139 (1995-09-01), Gallagher, Jr.
patent: 5476555 (1995-12-01), Erickson
patent: 5496425 (1996-03-01), Gallagher, Jr.
patent: 5509979 (1996-04-01), Kimura
patent: 5538566 (1996-07-01), Gallagher, Jr.
patent: 5637159 (1997-06-01), Erickson

Affiliated with

Also associated with

Rating

Method of forming a fastener does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of forming a fastener, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of forming a fastener will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2312468