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Multi-objective optimization of rolling process for A286 bolt thread of high-speed train

Published:2023-06-25 author:ZHAO Yu, LI Jia-chun, ZHANG Ping, et al. Browse: 378 Check PDF documents

Multiobjective optimization of rolling process for A286 bolt thread

of high-speed train

ZHAO Yu1, LI Jia-chun1, ZHANG Ping1, ZHONG Hao-tian2

(1.School of Mechanical Engineering, Guizhou University, Guiyang 550025, China;

2.China Aviation Industry Standard Parts Manufacturing Co.,Ltd., Guiyang 550000, China)

Abstract: The optimization of bolt thread rolling process parameters by orthogonal test method would lead to problems such as poor accuracy and low efficiency. At the same time, there was a little researchs on the relationship between thread rolling surface quality and bolt fatigue life through experiments. Aiming at the problem that A286 superalloy threaded fasteners were difficult to meet the fatigue life requirements of high-speed trains, the threaded fasteners used in highspeed trains were taken as the research object, a multi-objective optimization of thread rolling process parameters was carried out. Firstly, the process parameters that had a significant impact on the quality of thread rolling were selected as the optimization objectives: the spinning speed of the roller, the feed speed and the rolling finishing time. The maximum equivalent stress and the maximum damage were selected as the evaluation indexes, and the orthogonal test was designed. Then, a multi-objective optimization method based on Vague fuzzy set was used to optimize the thread rolling process parameters. Finally, the optimum process parameters of thread rolling were determined by fuzzy set optimization, and the accuracy of the optimization results was verified by simulation test and fatigue life test. The experiments result show that the optimal process parameters are spinning speed 16 r/min, feeding speed 3 mm/s and finishing time 1 s. After optimization, the fatigue life of bolts is increased by 9%. The results show that the optimization of thread rolling process parameters by Vague fuzzy set is effective and superior, which can provide theoretical basis for manufacturing.

Key words: superalloy threaded fastener; A286 superalloy; Vague fuzzy; orthogonal test method; fatigue life; optimum process parameters

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