Process for the preuse work-hardening of bolts

Details Process for the preuse work-hardening of bolts Process for the preuse work-hardening of bolts

1977-05-05

1978-03-14

Combs, E. M.

29452, 85 1T, 85 62, B21K 144

Patent

active

040782735

ABSTRACT:
A method for manufacturing bolts of a given grade and size in which, after forming, threading and heat treating, each bolt is work hardened by the application and subsequent removal of a tensile force of magnitude somewhat above the minimum proof load for the given grade and size of bolt, so that all bolts so treated will have the same yield point and the torque rotation curve for each bolt will have a discontinuity in slope at this common yield point.

REFERENCES:
patent: 2146825 (1939-02-01), Kinney
patent: 2637672 (1953-05-01), Losco et al.
patent: 2764514 (1956-09-01), Lee
patent: 3877281 (1975-04-01), Shimizu et al.
patent: 3943819 (1976-03-01), Charron

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