G - Physics – 05 – D
Patent
G - Physics
05
D
341/108
G05D 15/01 (2006.01) B25B 23/14 (2006.01) G05D 17/02 (2006.01)
Patent
CA 1097772
8138 IR-TH METHOD AND APPARATUS FOR FASTENER TENSIONING Abstract of the Disclosure A fastener tensioning method and apparatus for obtaining a desired degree of tension in a fastener. The apparatus includes a means for applying rotation to a fastener, a means for measuring the torque applied by the means for rotating the fastener, a means for determining a rate of change of torque applied to the fastener with respect to the rate of change of rotation applied to the fastener, a means for determining a shut off condition based on the determined rate of change of torque with respect to the rate of change of rotation and a proportional rate determined amount of rotation of the fastener, and a means to shut off the means for applying rotation to the fastener in response to the shut off condition being achieved. 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 occurred 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 propor- tional to the tension in the fastener. A prescribed addi- tional 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.
298256
Rice Edwin E.
Vliet Walter C.
Ingersoll-Rand Company
Swabey Ogilvy Renault
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