Method and apparatus for fastener tensioning

Details Method and apparatus for fastener tensioning Method and apparatus for fastener tensioning

1977-04-06

1978-08-15

Ruehl, Charles A.

Metal working

Method of mechanical manufacture

With testing or indicating

73 88F, 173 12, B23Q 500

Patent

active

041061764

ABSTRACT:
A fastener tensioning method and apparatus for obtaining a desired degree of tension in a fastener. The embodiment of this invention described utilizes the slope of the change in torque per change in rotation gradient to predict a rotation starting point independent of the rotation that occured in the torquing cycle up to the point of establishing a constant gradient. In the constant slope or gradient area of the torque rotation curve, rotation is considered linearly proportional to the tension in the fastener. A prescribed additional rotation is applied to the fastener utilizing the threads as a micrometer device for stretching the bolt to achieve the desired tension or fastener strain level. With appropriate system monitoring such as the total rotation, the maximum torque applied, the gradient slope, etc., the system can be adapted to inspect the fastener for applied tension as well as accurately control tension level.

REFERENCES:
patent: 2756622 (1956-07-01), La Belle
patent: 3974883 (1976-08-01), Sigmund
patent: 4026369 (1977-05-01), Vliet

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