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A method for calibrating the pretightening force of external threaded fasteners with sensors

A pre-tightening force and fastener technology, which is applied in the field of pre-tightening force calibration of external thread fasteners with sensors, can solve the problems of not considering nut characteristics, low reliability of results, redundant measurement parameters, etc. Eliminate the influence of various influencing factors, the calibration process is simple, and the calibration reliability is high.

Active Publication Date: 2021-05-28
AEROSPACE PRECISION PROD INC LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 1. The parameters considered are incomplete, which reduces the credibility of the calibration results, such as the influence of temperature on the length change of externally threaded fasteners, the thickness of the interlayer of the specific installation structure, and the characteristics of the nut, etc.;
[0008] 2. The measurement parameters are redundant, which increases the complexity and cost of the calibration process, such as measuring elongation, etc.;
[0009] 3. The measurement method is unreasonable, and the influencing factors of mutual interference are not considered separately, resulting in low reliability of the results

Method used

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  • A method for calibrating the pretightening force of external threaded fasteners with sensors
  • A method for calibrating the pretightening force of external threaded fasteners with sensors
  • A method for calibrating the pretightening force of external threaded fasteners with sensors

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Embodiment Construction

[0044] In order to better understand the present invention, the present invention will be described in detail below in conjunction with specific drawings. Due to space limitations, Tables 1 to 4 in the present invention only extract part of the data in the actual experiment, not all the results in the actual calibration method.

[0045] (1) Determine the temperature coefficient factor

[0046] 1. Test measurement

[0047] Put the bolt into the high and low temperature test chamber (the temperature control test chamber needs to have high temperature control accuracy and temperature uniformity) under the condition of no load. Confirm that the connection between the measuring probe of the ultrasonic measuring instrument and the externally threaded fastener to be tested is in good condition. Set the temperature of the test chamber as the reference temperature T0. After a certain time, ensure that the externally threaded fasteners reach thermal equilibrium. At this time, read the...

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Abstract

The invention provides a method for calibrating the pretightening force of externally threaded fasteners with sensors. act’ Carry out temperature correction, and then establish the temperature-corrected acoustic time difference △tn korr’ -△t0 korr and the function fitting relationship between different loads Fn, the obtained pretightening force F relative to the temperature-corrected acoustic time difference fitting equation can obtain highly reliable measurement results during measurement.

Description

technical field [0001] The invention relates to the field of pretightening force detection of fasteners, in particular to a method for calibrating the pretightening force of external threaded fasteners with sensors. Background technique [0002] At present, by preparing sensors / transducers on externally threaded fasteners, the technology of measuring the pretightening force of externally threaded fasteners by using ultrasonic signals excited by the sensor / transducer has a good application prospect. The technology mainly includes three aspects: [0003] 1. Fix, deposit and grow the piezoelectric sensor on the head of the externally threaded fastener or the end of the rod by pasting / welding / vacuum plating; [0004] 2. Calibrate the externally threaded fasteners with sensors according to a certain method. The calibration process may include determining the measurement parameters of externally threaded fasteners, environmental parameters, and ultrasonic signal parameters excit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L25/00
CPCG01L25/00
Inventor 夏斌宏杨兵高伟张文静马艳云徐昊梁新福张俊许彦伟刘燕李敬雨
Owner AEROSPACE PRECISION PROD INC LTD
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