Method and apparatus for tightening threaded fastener assemblies

Details Method and apparatus for tightening threaded fastener assemblies Method and apparatus for tightening threaded fastener assemblies

1980-04-07

1983-03-01

Husar, Francis S.

Metal working

Method of mechanical manufacture

With testing or indicating

29240, 73761, 7386223, 173 12, 364505, 364508, B23Q 1700, B23P 1904

Patent

active

043751202

ABSTRACT:
Apparatus and method for tightening assemblies held together by threaded fasteners. The desired tightened condition is achieved by calculating the tightening torque required to induce a desired preload in the threaded fastener and comparing this calculated tightening torque with the torque being imparted to the fastener to tighten the assembly. When the two torques are equal, the torque imparted to the fastener is stopped. The tightening torque is calculated by identifying properly the relationship between the torque-rotation curve through which the assembly is taken as it is being tightened and the preload-rotation curve for the assembly.

REFERENCES:
patent: 3982419 (1976-09-01), Boys
patent: 4000782 (1977-01-01), Finkelston
patent: 4104778 (1978-08-01), Vliet
patent: 4104780 (1978-08-01), Sigmund
patent: 4163310 (1979-08-01), Sigmund
patent: 4179786 (1979-12-01), Eshghy

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