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Method for testing and evaluating anti-loosening performance of bolt connection pair

An evaluation method and connection pair technology, applied in the field of mechanical assembly, can solve the problem of inability to test the anti-loosening performance, and achieve the effect of improving the anti-loosening performance and reliability, objective test results, and perfect and precise control.

Active Publication Date: 2022-01-11
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application provides a method for testing and evaluating the anti-loosening performance of bolted joints, so as to solve the problem that existing bolted joints with the same strength level and thread specifications in the related art cannot develop anti-loosening performance under the same axial clamping force level test questions

Method used

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  • Method for testing and evaluating anti-loosening performance of bolt connection pair
  • Method for testing and evaluating anti-loosening performance of bolt connection pair
  • Method for testing and evaluating anti-loosening performance of bolt connection pair

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Embodiment 1

[0044] Embodiment 1 of the present application provides a method for testing and evaluating the anti-loosening performance of a bolted joint, comprising the following steps:

[0045] Step S101, on the bolt tightening performance testing machine, tighten the calibration test bolts sequentially according to different axial clamping forces, use an ultrasonic measuring instrument to measure the axial elongation of the calibration test bolts after tightening, and according to the axial clamping force of the calibration test bolts The corresponding relationship between the bolt axial clamping force and the elongation is established by the tightening force and the measured axial elongation, and the corresponding relationship curve between the obtained bolt axial clamping force and elongation is as follows image 3 as shown, image 3 In , the relationship between bolt axial clamping force-elongation can be expressed as: y=-489.64x 3 +186.52x 2 +140.55x+1.5226, where, y represents th...

Embodiment 2

[0050] Embodiment 2 of the present application provides a method for testing and evaluating the anti-loosening performance of a bolted joint, comprising the following steps:

[0051] Step S101, on the bolt tightening performance testing machine, tighten the calibration test bolts sequentially according to different axial clamping forces, use an ultrasonic measuring instrument to measure the axial elongation of the calibration test bolts after tightening, and according to the axial clamping force of the calibration test bolts Tightening force and measured axial elongation establish the corresponding relationship of bolt axial clamping force-elongation, and the corresponding relationship curve diagram of the obtained bolt axial clamping force-elongation is the same as embodiment 1; this implementation In the example, the calibration test bolt is a bolt with a diameter of 10mm and a length of 60mm, and the number can be set to five;

[0052] Step S102, it is known that the target...

Embodiment 3

[0056] Embodiment 3 of the present application provides a method for testing and evaluating the anti-loosening performance of a bolted joint, comprising the following steps:

[0057] Step S101, on the bolt tightening performance testing machine, tighten the calibration test bolts sequentially according to different axial clamping forces, use an ultrasonic measuring instrument to measure the axial elongation of the calibration test bolts after tightening, and according to the axial clamping force of the calibration test bolts Tightening force and measured axial elongation establish the corresponding relationship of bolt axial clamping force-elongation, and the corresponding relationship curve diagram of the obtained bolt axial clamping force-elongation is the same as embodiment 1; this implementation In the example, the calibration test bolt is a bolt with a diameter of 10mm and a length of 60mm, and the number can be set to five;

[0058] Step S102, it is known that the target...

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Abstract

The invention relates to the technical field of mechanical assembly, in particular to a method for testing and evaluating the anti-loosening performance of a bolt connection pair. The anti-loosening performance testing and evaluating method provided by the invention comprises the following steps of: tightening a calibration test bolt according to different axial clamping forces, measuring the axial elongation of the calibration test bolt after being tightened by using measuring equipment, and establishing a corresponding relationship between the axial clamping force and the elongation of the bolt; inputting an axial clamping force target value in an impact vibration test into the corresponding relation of the axial clamping force and the elongation of the bolt to obtain an elongation monitoring target value of the tested bolt; respectively tightening a plurality of tested bolts to the elongation monitoring target value to carry out an impact vibration test; after the impact vibration test is finished, if all the tested bolts are loosened, determining the anti-vibration and anti-loosening performance according to an actual vibration cycle; and if a tested bolt which is not loosened exists, calculating the clamping force retention rate of the tested bolt which is not loosened, and determining the anti-vibration and anti-loosening performance according to the clamping force retention rate.

Description

technical field [0001] The present application relates to the technical field of mechanical assembly, in particular to a method for testing and evaluating the anti-loosening performance of bolted joints. Background technique [0002] The assembly connection of automobiles and various mechanical equipment is mainly in the form of threaded fastener connection, most of which are bolt (screw) fastening connection, especially bolt (screw)-nut connection pair. The bolt (screw)-nut connection method has lower requirements on the structure of the connected parts. It only needs to set a through hole on the connected part to realize the connection. The through hole structure is simple, the processing accuracy is not high, the processing is convenient, and the processing cost is low. Low. The most common failure mode during the service period after the bolt is assembled is the loosening of the fastener. The loosening will lead to the loss of the clamping force of the threaded connecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01M7/08
CPCG01M7/025G01M7/08
Inventor 严春雨郑立新卢海波蔡松涛郭东涛
Owner DONGFENG COMML VEHICLE CO LTD
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