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Open AccessArticle

Characterization of the Friction Coefficient of Aluminum Alloy 6061 in Ultra-Precision Machining

by Hailong Wang 1, Tao Zhang 2, Sujuan Wang 1,2,* and Suet To 3
1
State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China
2
Guangdong Provincial Key Laboratory of Micro-Nano Manufacturing Technology and Equipment, School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
3
State Key Laboratory in Ultra-precision Machining Technology, The Hong Kong Polytechnic University, Hong Kong, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(3), 336; https://doi.org/10.3390/met10030336
Received: 7 February 2020 / Revised: 1 March 2020 / Accepted: 2 March 2020 / Published: 3 March 2020
Aluminum alloy 6061(Al6061), an Al-Mg-Si alloy, is a precipitation-hardened alloy. The generation of precipitate affects its mechanical properties, and induces a worse surface finish during diamond cutting. The friction coefficients of the tool-chip and tool-workpiece interfaces influence temperature rise, and are therefore important predictors of tool wear and surface integrity during the diamond cutting of Al6061. This study investigated the relationship between precipitate generation and the friction coefficients of Al6061. Groups of experiments were conducted to study the influence of temperature and heating time on the number of precipitates and the friction coefficients. The results show that the generation of AlFeSi particles induces cracks, scratch marks and pits on diamond-machined Al6061 and affects the cutting forces. Moreover, the variation trend of the friction coefficient of Al6061 under different heating conditions agrees well with that of the number of AlFeSi particles. This implies that, during ultra-precision machining of precipitation-hardened alloys, cutting-induced heat causes precipitates to form on the chips and machined surface, changing their material properties. This affects the tool-workpiece and tool–chip contact conditions and the mechanisms of chip formation and surface generation in ultra-precision machining. View Full-Text
Keywords: friction coefficient; precipitates; aluminum alloy 6061(Al6061); ultra-precision machining friction coefficient; precipitates; aluminum alloy 6061(Al6061); ultra-precision machining
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Wang, H.; Zhang, T.; Wang, S.; To, S. Characterization of the Friction Coefficient of Aluminum Alloy 6061 in Ultra-Precision Machining. Metals 2020, 10, 336.

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