Bolt fastening method and apparatus

Details Bolt fastening method and apparatus Bolt fastening method and apparatus

2008-08-12

2010-11-02

Caputo, Lisa M (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

C173S002000, C029S407020, C029S407030

Reexamination Certificate

active

07823465

ABSTRACT:
A bolt is fastened up to a predetermined snug torque Ts and then the bolt is further fastened by a specified angle θt from a bolt angle corresponding to the snug torque Ts. Herein, in order to obtain excess and deficiency of the fastening angle up to the snug torque Ts, an angle-variation difference between the fastening angle θsb of the bolt at the point where the fastening torque of the bolt has reached the snug torque Ts and a standard angle θsa of the snug torque Ts is calculated. And, addition of this angle-variation difference to a base angle is set as the new specified angle θt to correct the excess and deficiency. Accordingly, variation in a fastening shaft force can be restrained even if the snug torque is set at a relatively high torque in the bolt fastening method using the torque+angle method.

REFERENCES:
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patent: 5837907 (1998-11-01), Ohmi et al.
patent: 6954682 (2005-10-01), Makimae et al.
patent: 7398700 (2008-07-01), Makimae et al.
patent: 2004/0027082 (2004-02-01), Makimae et al.
patent: 2006/0218768 (2006-10-01), Makimae et al.
patent: 2007/0006444 (2007-01-01), Makimae et al.
patent: 2004258644 (2004-09-01), None
Mario Garella, European Search Report, EP 08015065, Dec. 5, 2008.

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