Microprocessor control yield point tightening system

Details Microprocessor control yield point tightening system Microprocessor control yield point tightening system

1980-09-02

1983-11-08

Combs, Ervin M.

Metal working

Method of mechanical manufacture

With testing or indicating

173 1, B23P 1906, G01L 524

Patent

active

044133960

ABSTRACT:
A method for tightening a fastener to yield point wherein areas under a torque-angle curve--each of said areas including a constant abscissa--are successively measured. A decrease of area in a subsequently measured area, indicates that yield point of the fastener has occured. Upon attainment of yield point, the final torque and angular rotation parameters are checked to determine if pre-set values have been realized. The method includes a preliminary torque-angle curve measurement to determine if certain conditions are satisfied; failure to satisfy such conditions, aborts the tightening operation.

REFERENCES:
patent: 2600549 (1952-06-01), Ledbetter
patent: 3827506 (1974-08-01), Himmelstein et al.
patent: 3962910 (1976-06-01), Spyridakis et al.
patent: 4000782 (1977-01-01), Finkelston
patent: 4091451 (1978-05-01), Weiner et al.
patent: 4104779 (1978-08-01), Sigmund
patent: 4142591 (1979-03-01), Himmelstein
patent: 4147219 (1979-04-01), Wallace
patent: 4179786 (1979-12-01), Eshghy

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