航空发动机转子螺栓连接工艺评估与修正策略研究

Evaluation and Modification Strategy of Aero-Engine Rotor Bolted Connection Process

为提高航空发动机转子螺栓连接预紧力控制效果,提出一种基于试验数据的扭矩法加载目标扭矩修正方法。结合航空发动机螺栓多次装调工艺特性,设置装配工艺差异条件,并设计了3种扭矩修正策略,基于所搭建的法兰连接盘模拟件开展了试验研究。对各种加载策略下所得螺栓预紧力的离散度与距目标预紧力的偏离程度进行了分析评估,给出了不同工艺条件下各种扭矩修正策略对转子螺栓预紧力控制能力的改进效果。针对航空发动机转子螺栓拧紧需求,应考虑润滑条件和拧紧次数的差异,以改进目标预紧力,采用自锁力矩变化、拧紧次数相关的目标扭矩修正策略,定期标定目标扭矩,并尽量避免无润滑情况。

In order to improve the preload control effect of rotor bolted connection of aero-engine,a torque method for loading target torque based on test data is proposed.In this paper,combined with the characteristics of multiple assembly and adjustment process of aero-engine bolts,the assembly process difference conditions are set,and three torque modification strategies are designed,and experimental research is carried out based on the flange connection disc simulation parts built.The dispersion of the bolt preload obtained under various loading strategies and the deviation from the target preload were analyzed and evaluated,and the improvement effect of various torque modification strategies on the rotor bolt preload control ability under different process conditions was given.It is recommended that for the bolt tightening requirements of aero-engine rotor,the difference in lubrication conditions and tightening times should be considered to improve the target preload,and the target torque correction strategy related to the change of self-locking torque and the number of tightening times should be adopted to regularly calibrate the target torque and avoid no lubrication as much as possible.