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Method for measuring shaft force of bolt

A bolt shaft and bolt technology, which is applied in the field of threaded fastener testing, can solve problems such as complicated operation and inability to use assembly measurement, and achieve the effects of good interchangeability, low cost, and convenient assembly

Inactive Publication Date: 2019-05-07
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this document, the measurement of axial force requires the use of strain gauges, which is complicated to operate and cannot be used for assembly measurement in actual workplaces

Method used

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  • Method for measuring shaft force of bolt
  • Method for measuring shaft force of bolt
  • Method for measuring shaft force of bolt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0072] In the process of product development, it is necessary to design the assembly torque according to the axial force or verify the known assembly torque for the connection of important positions in the product development process. Taking the M10×1.5 bolt as an example, the method of the present invention is used to measure the actual assembly axial force. The test includes the following steps:

[0073] 1) Install the tooling fixture of the calibration bolt, thread one end of the support rod e into the internal thread hole of the shape block f, and insert it into the test bench or iron floor to fix it; and screw the other end of the support rod e into the support through the thread Inside the plate d and securely tightened and fixed;

[0074] After connecting the nut clamp c and the chuck b to the axial force sensor with screws or other reliable connection methods, connect the axial force sensor to the support plate d;

[0075] Place the adjusting washer a in the groove in ...

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Abstract

The invention belongs to the technical field of threaded fastener testing, and relates to a method for measuring shaft force of a bolt. The method comprises the following steps: 1, a calibration curve, for calibration, between the ultrasonic signal propagation time increment and the shaft force of the bolt is calibrated through tool clamps; 2, ultrasonic signal propagation time increment data of the actually assembled bolt are measured during actual assembling; and 3, the ultrasonic signal propagation time increment data of the actually assembled bolt are compared with the calibration curve toobtain the shaft force of the actually assembled bolt. According to the method, the situation that a connected piece is damaged, and thus waste is generated can be avoided, meanwhile, unification oftightening equipment during calibration and assembly can be guaranteed, and the system error is avoided so as to obtain more accurate test data; in addition, bolts of different specifications and connection lengths can further be calibrated by adjusting combinations of the clamps, and the accurate calibration curve is advantageously obtained to support the product design; and the structure is simple, assembling is convenient, the interchangeability is good, and operation is easy and convenient.

Description

technical field [0001] The invention belongs to the technical field of threaded fastener testing, and relates to a method for measuring the axial force of bolts, in particular to an axial force measuring method for calibrating tooling by using ultrasonic propagation time and adjustable connection length. Background technique [0002] Threaded connection is one of the most commonly used connection methods between auto parts. Its purpose is to keep the connected parts together and overcome the external force generated by the connected parts. It has the advantages of high precision, convenient assembly, and convenient disassembly and assembly of parts. Therefore, the essence of assembly tightening is to control the axial pre-tightening force of the bolt in an appropriate range. From the development process of the assembly method from the torque method to the torque-rotation method, the yield point method and the axial force method, the development trend of assembly tools and ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/24
Inventor 王吉洋李琨裕莉莉柴之龙由剑张薇柳超
Owner CHINA FIRST AUTOMOBILE
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