Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1980-04-07
1983-03-01
Husar, Francis S.
Metal working
Method of mechanical manufacture
With testing or indicating
29240, 73761, 7386223, 364508, B23Q 1700, B23P 1904
Patent
active
043751229
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 preload in a fastener equal to or approximating a predetermined preload and comparing this calculated 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 actual torque-rotation curve through which the assembly is taken as it is being tightened and the theoretical torque-rotation curve for the assembly from which a theoretical tightening torque required to induce the predetermined preload is established.
REFERENCES:
patent: 3974883 (1976-08-01), Sigmund
patent: 3982419 (1976-09-01), Boys
patent: 4104778 (1978-08-01), Vliet
patent: 4104780 (1978-08-01), Sigmund
patent: 4161221 (1979-07-01), Carlin et al.
patent: 4176436 (1979-12-01), McCombs et al.
patent: 4244245 (1981-01-01), Wallace et al.
patent: 4259869 (1981-04-01), Carlin
Arbes Carl J.
Husar Francis S.
Nerenberg Aaron
SPS Technologies, Inc.
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