Normal Contact Stiffness Model of Fine Particle Shot Peening Gear

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

Abstract

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

CLC Number:

TH113

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 Edition), 2022, 50(9): 90-98.

Figures/Tables 12

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序号	喷丸压强P/MPa	弹丸直径/mm	喷丸时间/s
1	0.3	0.03	60
2	0.4	0.03	60
3	0.5	0.03	60
4	未喷丸	—	—

参数	数值
齿数	25
模数/mm	4
压力角/（°）	20
齿顶高系数	1
顶隙系数	0.25
弹性模量/Pa	2.06×10¹¹
泊松比	0.3
硬度/MPa	6.86×10³

序号	喷丸压强P/MPa	分形参数D	粗糙幅值G/10^-6
1	0.3	1.618	3.03
2	0.4	1.608	3.27
3	0.5	1.593	3.35
4	未喷丸	1.585	3.75

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