Transactions of Materials and Heat Treatment

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ClassificationCode：TG376.1

year,vol(issue):pagenumber：2024,49(2):119-127

Abstract：

In order to comprehensively improve the surface quality of bearing rings, taking surface roughness, residual stress and microhardness as the evaluation indicators, the orthogonal test of ultrasonic roll extrusion was conducted on 42CrMo steel, and through the range analysis of various levels of processing parameters, the influence rules of the processing parameters on the evaluation indicators of each surface performance for 42CrMo steel were obtained. Then, based on the entropy weight theory, the weights of surface roughness, residual stress and microhardness were determined, and a comprehensive evaluation system of surface performance for bearing was constructed to obtain the impact of the processing parameters on the comprehensive surface performance and the optimal combination of processing parameters. Furthermore, the optimal combination of processing parameters was obtained by response surface optimization, and compared with the combination of processing parameters after comprehensive weighting optimization, its accuracy was verified by experiments. The results show that the weights of surface roughness, residual stress and microhardness in the comprehensive surface performance are 0.525, 0.334 and 0.141, respectively, and the influence degree of processing parameters on the comprehensive surface performance is rotation speed> static pressure> amplitude > feeding speed. The comparative test verification of the two optimization methods shows that the response surface optimization effect is better, and the optimal processing parameters are the rotation speed of 160 r·min-1, the feeding speed of 38.8 mm·min-1, the amplitude of 21 μm and the static pressure of 539.4 N, and the global optimization for the multi-objective optimization of processing parameters is realized.

Funds：

基金项目:国家自然科学基金资助项目(U1804145)；国家重点研发计划（2018YEB2000405）

作者简介：石青松（1998-），男，硕士研究生

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