Tension control method for nutrunner

Metal working – Method of mechanical manufacture – With testing or indicating

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29240, 173 1, B23D 1906

Patent

active

051055198

ABSTRACT:
A tension contol method for a nutrunner performed by the use of a nutrunner and a controller associated with each other. In accordance with the present invention, the fastening torque T.sub.f of the torque transducer of the nutrunner at an intermediate position of a fixed first rotation angle .theta. included in a middle range from the seating of a controlled screw on a tightened object to the final fastening position of the screw is stored. The motor of the nutrunner is stopped at a position of a second rotation angle (.theta.+.alpha.) larger than the first rotation angle by a fixed value .alpha.. The motor of the nutrunner is reversed at the second rotation angle (.theta.+.alpha.). A return torque T.sub.r of the motor at the position of the first rotation angle .theta. is stored. The ratio of the fastening torque T.sub.f to a bolt tension F applied to the screw is calculated by the use of a difference between the fastening torque T.sub.f and the return torque T.sub.r at the position of the first rotation angle .theta.. The motor is stopped at a calculated target T.sub.s obtained by multiplying a pre-input target value F.sub.s of a required bolt tension by the calculated ratio to fasten the screw at a stable required bolt force.

REFERENCES:
patent: 3939920 (1976-02-01), Hardiman et al.
patent: 4016938 (1977-04-01), Rice
patent: 4267629 (1981-05-01), Eshghy
patent: 4375121 (1983-03-01), Sigmund
patent: 4488437 (1984-12-01), Pere

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