MICROPROCESSOR CONTROL YIELD POINT TIGHTENING SYSTEM

A method for tightening a fastener to yield point wherein areas under a torque-angle curve each include a constant abscissa and are successively measured. A decrease of area in a subsequently measured area, indicates that yield point of the fastener has occurred. Upon attainment of yield point, the...

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Bibliographische Detailangaben
Hauptverfasser:	WALLACE, WILLIAM K, GIARDINO, DAVID A, GROSHANS, JOSEPH R
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	COMBINED OPERATIONS HAND TOOLS MACHINE TOOLS MANIPULATORS METAL-WORKING NOT OTHERWISE PROVIDED FOR OTHER WORKING OF METAL PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FORFASTENING, CONNECTING, DISENGAGING OR HOLDING TRANSPORTING UNIVERSAL MACHINE TOOLS
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Beschreibung
Zusammenfassung:	A method for tightening a fastener to yield point wherein areas under a torque-angle curve each include a constant abscissa and are successively measured. A decrease of area in a subsequently measured area, indicates that yield point of the fastener has occurred. 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.