Method and device for measuring axial force of threaded fasteners

Abstract

The invention discloses a method for measuring the axial force of a thread fastening member. The actual use process of connecting a connecting member with a connected member by the thread fastening member is stimulated, a contact pressure between combining surfaces of a connecting member and a connected member is obtained, and the axial force of the thread fastening member is determined according to the contact pressure. A partial acting effect of the axial force of the thread fastening member is realized by the contact pressure between the combining surfaces of the connecting member and the connected member. According to the method, the axial force of the thread fastening member is indirectly determined through the obtained contact pressure by using the characteristic. Obviously, compared with existing measuring methods, the method provided by the invention has the advantages that the axial force of the thread fastening member is indirectly obtained by the acting effect of the axial force, and the measurement precision is not influenced by elastic deformation and plastic deformation of the thread fastening member, and therefore, the method provided by the invention is remarkably superior to the two existing measuring methods on the aspect of measuring precision. On the basis, the invention further discloses a device for measuring the axial force of the thread fastening member.

Description

technical field [0001] The invention relates to the technical field of measuring the axial force of threaded fasteners, in particular to a method for measuring the axial force of threaded fasteners and a measuring device thereof. Background technique [0002] When designing bolts, the axial pretightening force (axial force) required by the bolts must first be determined according to the working conditions and requirements to meet the requirements of the connection; in the actual assembly process of the bolts, a certain torque is usually applied to the bolts so that The bolt axial force meets the design requirements. [0003] In the real working condition of bolted connection, when the bolt is subjected to external load, it is easy to loosen or even loosen, and the axial force of the bolt is attenuated in the process. Bolt axial force attenuation is an important reason affecting mechanical reliability. With the development of science and technology, the importance of reliab...

AI Technical Summary

Problems solved by technology

[0006] Obviously, the above two methods of measuring the bolt axial force both use the relationship between the bolt axial force and the bolt elongation in the elastic range to detect and track the bolt axial force, which is suitable for measurement in the elastic stage of the bolt. However, when the bolt undergoes plastic deformation , there is a problem of low measurement accuracy, and the true value of the bolt axial force cannot be obtained

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