Theoretical and Experimental Research on Processing Balls with Eccentric Variable-radius V-groove

doi:10.3901/JME.2019.09.183

Abstract

Abstract: A new batch processing method for precision balls with eccentric variable-radius groove plate (EVGP) is proposed. In this method the motion state of ball is continuously changed with the variation of the groove radius as the ball moving along the groove. Balls can be one by one from the outlet along processing plate edge to the inlet in the center of plate by employed cycling feeding transporter. Based on the assumption of pure rolling motion, the geometric kinematic model of a single ball is built, and then the processing trajectory on the spherical surface can be obtained by rotation coordinate transformation. Processing experiment is carried out on the EVGP equipment which is self-manufactured. The experimental results of observation are agreement with simulation results. Thereby the kinematic model is proved to be valid. There are three stages which are fine lapping, super fine lapping and polishing in processing experiment. In the lapping stage, the variation of ball lot diameter, sphercity and the deviation of surface roughness Ra have been improved significantly and gradually to be convergence. After the final polishing stage, the best polishing results of a single ball achieved are surface roughness Ra of 9 nm and sphericity of 0.114 μm.

Key words: consistency, eccentric variable-radius v-groove, kinematics, precision balls, processingtrajectory

CLC Number:

TH145
TH140

GUO Weigang, YUAN Julong, ZHOU Fenfen, XIANG Zhen, ZHAO Ping, LÜ Binghai. Theoretical and Experimental Research on Processing Balls with Eccentric Variable-radius V-groove[J]. Journal of Mechanical Engineering, 2019, 55(9): 183-190.

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