Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1979-04-19
1981-05-19
Combs, Ervin M.
Metal working
Method of mechanical manufacture
With testing or indicating
29240, 73761, 173 12, B23P 1906
Patent
active
042676290
ABSTRACT:
There is disclosed a technique for tightening threaded fasteners in which values of offset torque, initial tension rate relative to angle, final tension rate relative to angle and other joint related factors are empirically determined by instrumenting a plurality of fasteners of the type ultimately to be tightened. In one embodiment, torque and angle are monitored during tightening. Calculations are conducted, while tightening, to determine the tension prevailing in the bolt at a particular angle of advance. By using the calculated tension value and the particular angle of advance, an instantaneous position of threading advance on the tension-angle curve of the fastener is established. From this instantaneous position, it is determined how much greater angle of advance or how much torque is required to tighten the fasteners to a final desired tension value. The same technique may also be used merely to monitor tightening which is terminated by a different tightening strategy. A number of quality control procedures are conducted to determine if the fastener and the tightening tool are performing normally. In another embodiment, analog devices are utilized to convert sensed values of torque and the rate of threading advance into parameters which control tool shut off.
REFERENCES:
patent: 1985916 (1935-01-01), Coates et al.
patent: 3596718 (1971-08-01), Fish et al.
patent: 3974685 (1976-08-01), Walker
Combs Ervin M.
Rockwell International Corporation
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