Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Analyzing Friction Coefficient and Wettability of Micro-Dimple Fabricated Using Elliptical Vibration Texturing Method

이중 주파수 타원형 진동 궤적법 기반 마이크로 딤플의 마찰계수 및 습윤성 분석

  • Park, Gun Chul (School of Mechanical Engineering, Yeungnam UNIV.) ;
  • Ko, Tae Jo (School of Mechanical Engineering, Yeungnam UNIV.) ;
  • Kurniawan, Rendi (School of Mechanical Engineering, Yeungnam UNIV.) ;
  • Ali, Saood (School of Mechanical Engineering, Yeungnam UNIV.)
  • Received : 2019.12.30
  • Accepted : 2020.03.22
  • Published : 2020.05.31
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Abstract

Surface texturing of micro-dimples has been used in many manufacturing industries to reduce friction between two sliding contacted surfaces. Surface texturing decreases the frictional force owing to minimizing of the sliding contact area. In this paper, micro-dimples have been fabricated on an Al6061-T6 surface using a two-frequency elliptical vibration texturing (TFEVT) method. A high-frequency of 18 kHz and low-frequency of 250 Hz were applied to an elliptically-vibrated tool holder. The Stribeck curve was plotted to analyze the friction coefficient trends. Furthermore, the representative wetting index, such as the water contact angle (WCA), was measured by considering the friction coefficient. WCA is associated with micro-dimple density and associated parameters. Consequently, the dimpled surfaces with a low friction coefficient exhibited a relatively high WCA in the feed direction. According to the Stribeck curve, the dimpled surfaces demonstrate superior friction performance for mixed-film lubrication compared to the non-textured surface.

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References

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