Method of prestressing bolts

Details Method of prestressing bolts Method of prestressing bolts

1978-12-26

1980-10-28

Combs, Ervin M.

Metal working

Method of mechanical manufacture

Assembling or joining

10 27R, B21K 146, B21D 3100

Patent

active

042298750

ABSTRACT:
A fatigue resistant bolt, and method for making same, is disclosed. Bolts which are tightened to very high loads and are subjected to a dynamic environment are particularly subject to fatigue failure. It has been found that a bolt with fatigue resistant properties may be manufactured if its threads are formed while it is subjected to its design load. In another embodiment of the invention it has been found that the fatigue properties of the fillet at the bolt head and shank juncture may be significantly increased if the fillet is cold worked while the bolt is subjected to its design load.

REFERENCES:
patent: 2060593 (1936-11-01), Schaurte et al.
patent: 2341469 (1944-02-01), Newall
patent: 4023225 (1977-05-01), Tochilkin et al.
patent: 4035858 (1977-07-01), Dahl

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