Axial pre-tightening force double-wave measuring method

Abstract

The invention provides an axial pre-tightening force double-wave measuring method. The method comprises the steps: integrating a pre-tightening force sensor on one end face of a fastener in situ; determining parameters of the fastener; respectively acquiring transverse wave and longitudinal wave temperature compensation calibration curves of the fastener; measuring a sound time difference from theemission of the transverse wave and the longitudinal wave to the reception of the first echo, and taking the sound time difference ratio of the transverse wave and the longitudinal wave as a reference value; acquiring an axial pre-tightening force calibration curve between the sound time difference ratio of the transverse wave and the longitudinal wave and the axial pre-tightening force of the fastener under the same working condition; and applying a pre-tightening force to the fastener, and measuring the acoustic time difference ratio of the transverse wave to the longitudinal wave to obtainan axial pre-tightening force of the fastener corresponding to the sound time difference ratio. According to the invention, ultrasonic double-wave rapid high-precision measurement of the axial pre-tightening force of the fastener is realized, and problems of poor sensor environmental adaptability, incapability of realizing simultaneous receiving and transmitting of double waves, too redundant detection equipment lines, fuzzy implementation details of the method, measurement failure caused by ultrasonic waveform distortion and the like in the prior art are solved.

Description

technical field [0001] The invention relates to a method for measuring axial pretightening force, in particular to a method for measuring axial pretightening force with double waves. Background technique [0002] In the prior art, piezoelectric ceramic sheets are mostly used as ultrasonic transducers for the measurement of the pretightening force of fasteners, and the same piezoelectric oscillator needs to be pasted on both ends of the fastener as the transmitting end and reflecting end respectively, or Paste a piezoelectric ceramic sensor on one end of the fastener as the ultrasonic transceiver. On the one hand, the method, state, and thickness of the paste cannot guarantee the consistency of each fastener, and the measured value of batch fasteners has a large Due to the discrete nature of the measurement method, there is a large error and the measurement accuracy is not high. On the other hand, the introduction of the coupling adhesive makes the product have environmental ...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a dual-wave measurement method for axial pretightening force, which realizes fast and high-precision ultrasonic dual-wave measurement of the axial pretightening force of fasteners, and solves the problem of poor environmental adaptability of sensors in the prior art and the inability to realize Simultaneous transmission and reception of dual waves, overly redundant detection equipment lines, fuzzy method implementation details, and measurement failure due to ultrasonic waveform distortion

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