Method and apparatus for evaluating clamp force in a bolt by means of ultra-sonic measurements
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United States of America Patent
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Nov 1, 2016
Grant Date -
Nov 5, 2015
app pub date -
Dec 10, 2013
filing date -
Dec 18, 2012
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Abstract
In an apparatus and a method of evaluating a clamp force (F) in a threaded joint between a bolt and a matching threaded piece during a tightening operation, a torque (T) provided to the joint is continuously measured and ultra-sonic pulses are simultaneously induced into the bolt such that a time of flight (TOF) of the pulses in the bolt is measured. In response to an increase of the measured torque (T) an increase rate (dT/dα) of the torque (T) is determined, from which an initial rotation angle (α0) where the torque (T) starts to increase due to bolt deformation is determined. An increase rate (dTOF/dα) of the time of flight (TOF) is also determined. A total increase of the time of flight (ΔTOF) during the tightening operation is then determined based on the initial rotation angle (α0) and the increase rate (dTOF/dα) of the time of flight (TOF).
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