开槽螺母-螺栓连接副拧紧特性研究  

A research on tightening characteristics of slotted nut-bolt connection pair

作　　者：李坤 刘龙权[1,2] LI Kun;LIU Longquan(School of Aeronautics and Astronautics,Shanghai Jiao Tong University,Shanghai 200240,China;Lab of Civil Aircraft Structural Testing,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学航空航天学院,上海200240 [2]上海交通大学民机结构强度综合实验室,上海200240

出　　处：《现代制造工程》2024年第6期122-127,共6页Modern Manufacturing Engineering

基　　金：国家自然科学基金项目(52075326)。

摘　　要：由于飞机飞行过程持续遭受振动载荷,设计中广泛采用具有自锁功能的开槽螺母-螺栓连接副以防螺栓的松动和夹紧力损失。研究开槽螺母-螺栓连接副的拧紧特性,对保证连接结构的力学性能、安全性和可靠性具有重要意义。对开槽螺母拧紧工艺开展了理论分析,修正了其夹紧力-拧紧力矩关系公式。试验研究了开槽螺母型号、被连接件材料、润滑条件以及重复拧紧次数等条件对拧紧特性的影响。研究结果表明,NASM14144开槽螺母相较于高度较低的NASM14145开槽螺母,预置力矩提升了125.9%,而扭矩系数稍有降低;饱和润滑方式能有效降低扭矩系数及其波动性,螺母-连接板贴合面润滑的效果次之;重复拧紧过程使得NASM14144螺母的预置力矩降低、扭矩系数明显升高,而NASM14145螺母的拧紧特性并未显著改变。Since the aircraft is continuously subjected to vibratory loads during flight process,the self-locking slotted nut-bolt con-nection pair is widely used in design to prevent loosening of the bolt and loss of clamping force.Studying the tightening character-istics of the slotted nut-bolt connection pair is of great significance for ensuring the mechanical performance,safety,and reliability of the connected structure.Theoretical analysis was conducted on the tightening process of the slotted nut,and the clamping force-tightening torque relationship formula was corrected.The influence of factors such as slotted nut type,connected material,lubrica-tion conditions,and repeated tightening times on tightening characteristics was investigated through experiments.The results show that the prevailing torque of NASM14144 slotted nut is increased by 125.9%and the torque coefficient is slightly decreased com-pared with the lower NASM14145 slotted nut.Torque coefficient and its fluctuation can be effectively reduced by saturated lubrica-tion method,and lubrication of the nut-plate bonding surface is less effective.In the process of repeated tightening,the prevailing torque of NASM14144 nut was reduced and the torque coefficient was significantly increased,while the tightening characteristics of NASM14145 nut did not change significantly.

关 键 词：拧紧过程 开槽螺母 预置力矩 夹紧力 复合材料 

分 类 号：V229.1[航空宇航科学与技术—飞行器设计]