Journal of South China University of Technology(Natural Science) >

2022 , Vol. 50 >Issue 9: 90 - 98

DOI: https://doi.org/10.12141/j.issn.1000-565X.210803

Mechanical Engineering

Normal Contact Stiffness Model of Fine Particle Shot Peening Gear

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  • 1.School of Mechanical and Automotive Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
    2.Zhuhai Kwunhing Machinery and Electronic Co. Ltd，Zhuhai 519170，Guangdong，China
莫海军（1966-），男，博士，副教授，主要从事机器人抓取及机械传动研究。E-mail:mohj@scut.edu.cn
万珍平（1971-），男，博士，教授，主要从事表面功能结构先进制造及其作用机理研究。

Received date: 2021-12-17

  Online published: 2022-02-10

Supported by

the Key Research and Development Plan of Guangdong Province(2020B090926004)

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Abstract

Fine particle shot peening is one of the key technologies for high-performance gear manufacturing. In the study of gear dynamics and gear precision manufacturing, one of the important research topics is accurately analyzing the influence of fine particle shot peening on the normal contact stiffness of gear. In this paper, the changes of micro morphology of gear teeth surface before and after the fine particle shot peening were compared and analyzed through characterizing the micro morphology of the fine particle shot peened gear surface. Based on the fractal theory, the normal contact stiffness model of the fine particle shot peened gear was established considering the elastic-elastoplastic-plastic deformation of a single asperity and asperity interaction. It conducted a simulation analysis on the variation law of the normal contact stiffness along with the normal load, the fractal dimension D, the fractal rough amplitude G and the parameter of material property. The influence of fine particle shot peening on the normal contact stiffness of the gear was analyzed by extracting the fractal parameters of fine particle shot peened gear surface with the power spectral density function method. The results show that fine particle shot peening leads to randomly distributed micron or even nanoscale pits on the gear surface, and the decrease of surface roughness. Also, the gear surface roughness increases with the increase of fine particle shot peening strength. The normal contact stiffness increases with the increase of normal load, material yield strength, and fractal dimension D, and decreases with the increase of fractal roughness amplitude G. Fine particle shot peening can change the gear normal contact stiffness by changing the micro morphology of gear surface, and then change the fractal dimension D and fractal roughness amplitude G. Compared with the gear without fine particle shot peening, the normal contact stiffness of fine particle shot peened gears is improved. With the increase of shot peening strength, the normal contact stiffness of gears decreases. The research results provide a theoretical basis for gear dynamics research and high-performance gear manufacturing.

Key words： fine particle shot peening; gear; asperity interaction; normal contact stiffness; fractal theory

Cite this article

MO Haijun, ZHAO Hang, CHENG Yu, et al . Normal Contact Stiffness Model of Fine Particle Shot Peening Gear[J]. Journal of South China University of Technology(Natural Science), 2022 , 50(9) : 90 -98 . DOI: 10.12141/j.issn.1000-565X.210803

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