Title: Statistical characteristics and logarithmic EWMA control method of bearing raceway's surface roughness by superfinishing

Authors: Shuangjiao Fan; Wangcheng Qiu; Wenxu Chen; Jing Du; Qiang Liu; Guibing Pang

Addresses: School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, 116034, China ' School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, 116034, China ' School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, 116034, China ' School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, 116034, China ' School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, 116034, China ' School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian, 116034, China

Abstract: The bearing raceway is the main working surface of the bearing and good surface integrity is required. Since superfinishing is an important method for achieving high surface quality, it is usually used as the last processing to play a very essential part in improving the surface integrity of bearing raceway. In this paper, we proposed a superfinishing surface quality control method, by which we could determine whether there were systematic factors that caused surface quality anomalies by measuring and analysing the roughness data without directly measuring process parameters and environmental indicators. Firstly, we verified through experiment that the surface roughness by superfinishing did not obey the normal distribution but obeyed the logarithmic normal distribution. We interpreted this statistic characteristics by the mechanism of the relationship between roughness and random factors in the superfinishing. Then, according to above findings, and considering the possible trend of surface roughness during continuous processing, we designed a logarithmic exponentially weighted moving average (EWMA) method to test the surface roughness and judge whether it was under control. Finally, the effectiveness of this surface quality control method in superfinishing was verified by applying it to the actual bearing raceway outer ring machining.

Keywords: superfinishing; surface roughness; lognormal distribution; quality control; exponentially weighted moving average; EWMA.

DOI: 10.1504/IJAT.2019.101437

International Journal of Abrasive Technology, 2019 Vol.9 No.2, pp.113 - 128

Received: 17 Nov 2018
Accepted: 22 Apr 2019
Published online: 07 Aug 2019 *

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