Method and apparatus for pretensioning screw joints

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

1977-11-17

1979-07-17

Staab, Lawrence J.

Tool driving or impacting

Processes

173 12, B23Q 1906

Patent

active

041612205

ABSTRACT:
A method and apparatus for tightening a screw joint to a predetermined axial load F.sub.p providing the spring constant k=F/.phi. of the joint is known, wherein the joint stiffness or torque/rotation radient dM/d.phi. is calculated during the tightening process and the torque application on the joint is interrupted as a torque level M.sub.s is obtained that according to the spring constant or axial load/rotation relationship F/.phi. and the calculated joint stiffness dM/d.phi. corresponds to the predetermined axial load F.sub.p.

REFERENCES:
patent: 3939920 (1976-02-01), Hardiman et al.
patent: 3974685 (1976-08-01), Walker
patent: 3974883 (1976-08-01), Sigmund
patent: 3982419 (1976-09-01), Boys
patent: 4014208 (1977-03-01), Moore et al.
patent: 4016938 (1977-04-01), Rice
patent: 4026369 (1977-05-01), Vliet

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