Method and apparatus for pretensioning screw joints

Details Method and apparatus for pretensioning screw joints Method and apparatus for pretensioning screw joints

G - Physics

01

L

341/108.1

G01L 1/00 (2006.01) B25B 23/14 (2006.01)

Patent

CA 1112335

ABSTRACT OF THE DISCLOSURE A method and apparatus for tightening a screw joint to a predeter- mined axial load Fp, providing the spring constant Image of the joint is known, wherein the joint stiffness or torque/rotation gradient Image is calculated during the tightening process, and the torque application on the joint is interrupted as a torque level M5 is obtained, that, according to the spring constant or axial load/rotation relationship Image , and the calculated joint stiffness Image , corresponds to the predetermined axial load Fp.

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