双螺母防松螺栓拧紧过程的理论与仿真研究  

THEORETICAL AND SIMULATION RESEARCH ON TIGHTENING PROCESS OF DOUBLE NUT ANTI-LOOSENING BOLTS

作　　者：江文强[1] 朱永凯 冯立言 刘景立 牛卓博 安利强[1] JIANG Wen-qiang;ZHU Yong-kai;FENG Li-yan;LIU Jing-li;NIU Zhuo-bo;AN Li-qiang(Department of Mechanical Engineering,North China Electric University,Baoding 071003,China;State Grid Hebei Electric Power Company Ltd.,Baoding Power Supply Branch Company,Baoding 071051,China)

机构地区：[1]华北电力大学机械工程系,保定071003 [2]国网河北省电力有限公司保定供电分公司,保定071051

出　　处：《工程力学》2024年第12期215-223,共9页Engineering Mechanics

基　　金：国家电网有限公司总部科技项目(SGHEBD00FCJS2000217)。

摘　　要：工程中双螺母防松是一种常见的螺栓连接防松形式。为研究双螺母螺栓拧紧过程中的力学性能,考虑螺纹柔性的影响,建立了双螺母螺栓连接的力学模型,对螺纹的受力进行了分析,推导并给出了螺栓杆轴力和螺纹表面接触应力的计算方法,研究了螺纹接触应力的分布规律,以及上下螺母拧紧力矩配比对螺纹接触状态的影响,建立了螺栓预紧力与上下螺母拧紧力矩的关系,分析对比了螺栓规格、螺母厚度配比对螺栓杆轴力分布、接触应力的影响规律。建立了双螺母螺栓的精细化有限元模型,并将仿真结果与理论结果进行了对比验证,结果发现该文推导给出的螺栓杆轴力计算方法与有限元结果吻合很好。Double nut is a common anti-loosening form of bolt connection in engineering practice.In order to study the mechanical properties of double nut bolts during tightening process,the mechanical model of double-nut bolted joint considering the influence of thread flexibility is established,and the thread forces are analyzed.The calculation method is deduced for the bolt rod axial force and the thread surface contact stress.Analyzed on thread contact state are the distribution law of thread contact stress and,the influence of upper and lower nut tightening torque ratio.The relationship between bolt preload and nut tightening torque is established,and the influence of bolt specification and the ratio of upper and lower nut thickness on bolt axial force distribution and on contact stress are compared.The refined finite element models of double-nut bolted joint are established,and the simulation results are compared with the theoretical results.The results show that the calculation method of the bolt rod axial force presented are consistent with the finite element results very well.

关 键 词：双螺母螺栓连接 拧紧过程 轴力分布 接触应力 理论与仿真 

分 类 号：TH131.3[机械工程—机械制造及自动化]