Evaluation and Analysis on Bolt Pre-tightening Forces of Nine-stage Disc Assembly

Abstract

Abstract: In order to find out the ranges of effective pre-tightening forces for bolts reused in the assembly of nine-stage discs in aviation, the assembly environment was simulated and the experiments were carried on the thread friction testing machine to research the repeated tightening forces of aerial fasteners and the variation law. The experiment of tightening and pulling relationship was repeated 15 times. The experiment set up a comparison group of sufficient lubrication, local lubrication and without lubrication, and analyzed the effect of repeated tightening on the changes of pre-tightening forces under different lubrication conditions. The results show that lubrication has positive significance for reducing the friction coefficient values of the contact surfaces and improving the stability of the friction coefficient, which may further improve the efficiency and stability of torque conversion into pre-tightening forces. Repeated tightening will change the conversion efficiency and stability of the pre-tightening forces, and the laws shown under different lubrication conditions are different, which provides a support for the evaluation of the pre-tightening forces of the nine-stage disc bolts reused.

Key words: nine-stage disc assembly, bolt pre-tightening force, repeated tightening, lubrication

摘要： 为探明航空发动机九级盘装配中螺栓重复使用有效预紧力范围，以螺纹摩擦试验机为测试手段，搭建九级盘连接模拟装配环境，研究航空发动机螺栓重复拧紧预紧力大小及其变化规律。开展了重复15次拧紧扭拉关系试验，试验设置了充分润滑、局部润滑与无润滑对比组，分析不同润滑条件下重复拧紧对螺栓预紧力变化规律及目标载荷的影响。试验结果表明，润滑对减小接触面的摩擦因数值并提高摩擦因数的稳定性具有积极意义，进而能够提高扭矩转化为预紧力的效率和稳定性；重复拧紧会改变预紧力的转化效率及稳定性，且不同的润滑条件下所表现出的规律也不尽相同。研究结果为九级盘螺栓重复使用预紧力评估提供一定参考。

关键词: 九级盘装配, 螺栓预紧力, 重复拧紧, 润滑

CLC Number:

TH131
V23

ZHAO Bing, ZHANG Shouyang, WANG Hui, WU Dongbo, QIAO Tingqiang, HUANG Xin. Evaluation and Analysis on Bolt Pre-tightening Forces of Nine-stage Disc Assembly[J]. China Mechanical Engineering.

赵兵, 张守阳, 王辉, 吴动波, 乔廷强, 黄鑫. [装配技术]九级盘装配连接螺栓预紧力评估与分析[J]. 中国机械工程.

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