表面涂层分布对自锁螺栓锁紧力矩的影响研究  

Effect of Surface Coating Distribution on Locking Torque of Self-Locking Bolts

作　　者：刘本领 张晓斌 王洪飞 白清顺[2] LIU Ben-ling;ZHANG Xiao-bin;WANG Hong-fei;BAI Qing-shun(Aerospace Precision Products Co.,Ltd.,Tianjin 300302,China;School of Mechatronics Engineering,Harbin Institute of Technology,Heilongjiang Harbin 150001,China)

机构地区：[1]航天精工股份有限公司,天津300302 [2]哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001

出　　处：《机械设计与制造》2024年第9期160-163,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金(52075129)。

摘　　要：涂层自锁螺栓是航空航天领域重要的紧固件。表面涂层对自锁螺栓的锁紧力矩和使用安全等影响显著。为了解决航空航天结构用螺纹连接的松动问题,这里分析了自锁螺栓的防松机制及防松措施,提出整周涂层、对点涂层和半周涂层三种表面涂层分布形式,并完成了预试验分析,确定最佳涂层分布形式为半周涂层,选取涂层材料为NYLON11尼龙胶粉;实施了自锁螺栓半周涂层时常温和高温台架性能验证试验。结果表明,采用整周涂层和对点涂层时,随着螺栓的拧入,出现锁紧力矩过大、涂层破坏和锁紧力矩衰退严重问题;半周涂层时,螺栓拧入时未出现涂层破坏,涂层厚度保证自锁螺栓能自由地通过环规(最大螺纹大径+0.076mm)时锁紧性能优异,常温和高温最大锁紧力矩分别趋于为1.82N·m和1.51N·m附近,常温和高温最小脱松力矩均大于0.22N·m,满足生产需求。Coated self-locking bolts are important fasteners in aerospace field.The surface coating has a significant effect on the locking torque and safety of self-locking bolts.In order to solve the aerospace structure with threaded connection loose problem,this paper analyzes the self-locking bolt locking mechanism and locking measures,put forward the whole week coating layer,to the point and three and a half weeks coating surface coating distribution form,and complete the test analysis,the optimum coat⁃ing layer distribution form for half a week,selection of coating materials for NYLON11 nylon powder;The self-locking bolts were tested by semi-cycle coating test and high temperature test.The results show that when the whole coating and the point coat⁃ing are used,the locking torque is too large,the coating is damaged and the locking torque declines seriously with the screw in.When the coating is half circumference,no coating damage occurs when the bolt is screwed in.When the coating thickness ensures that the self-locking bolt can freely pass through the ring gage(maximum thread diameter+0.076mm),the locking performance is excellent.The maximum locking torque at room temperature and high temperature tend to be around 1.82N·m and 1.51N·m,respectively.At room temperature and high temperature,the minimum loosening moment is greater than 0.22N·m to meet the pro⁃duction requirements.

关 键 词：表面涂层 分布形式 锁紧力矩 自锁螺栓 理论分析 试验研究 

分 类 号：TH16[机械工程—机械制造及自动化] TH131.3