基于预紧力一扭矩修正公式的螺栓装配方法与连接均一性研究

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中图分类号：TH131.3 文献标志码：A文章编号：1006-0316（2025）08-0042-07

doi：10.3969/j.issn.1006-0316.2025.08.007

Study on Bolt AssemblyMethod and Connection Homogeneity Based on Preload-TorqueCorrectionFormula

LI Xujian1²，LI Hechang³，ZHOU Yubao1，²，HU Yunpeng1²，WANG He4 （1.Henan Key Laboratory of Tightening Connection Technology， Xinyang 4640o0， China;

2.Henan Aerospace Precision Manufacturing Co.，Ltd.， Xinyang 4640o0，China; 3.KeyLaboratoryof AdvancedTechnologiesofMaterials，MinistryofEducation，Chengdu 61o031，China; 4.Schoolof Mechanics and Aerospace Engineering，Southwest Jiaotong University， Chengdu 61oo31， China）

Abstract ∵ Given the complexity and importance of preload control， this study is devoted to optimizing the torque-preload equation to improve control accuracy and stability.The study thoroughly analyzes the influence ofthread geometry parameters，friction coefficient，bolt processing quality and other factors on the torque-preload force relationship，reveals the relevant mechanism and change rule，and lays a theoretical foundation for the formula correction.On this basis，a correction coefficient x ，which takes into account individual diferences，is introducedtoestablisha preload-torque correction formula applicable todiffrentbolts and nuts.Thecorrection formula hasahigh degreeofaccuracyand stabilityas verifiedbyactualtightening tests. Basedon thecorrection formula，an indirect preload control method isproposed，which significantly improves thehomogeneityof assemblyqualitybymore than 50% andup to nearly 80% ，and especiallyimproves the tightening quality of stainless steel bolts significantly. It is also found that only by the MoS2 lubrication of the thread contact surfaces can the homogeneity of the assembly quality be improved to a certain extent.

Keywords ∵ torque;preload;frictioncoefficient;correction factor

紧固件连接结构广泛应用于机械、航空航天、汽车等工业领域。（剩余7370字）