이중 주파수 타원형 진동 궤적법 기반 마이크로 딤플의 마찰계수 및 습윤성 분석
Analyzing Friction Coefficient and Wettability of Micro-Dimple Fabricated Using Elliptical Vibration Texturing Method
박건철(영남대학교 기계공학부); 고태조(영남대학교); 쿠르니아완렌디(영남대학교); 아리사우드(영남대학교)
19권 5호, 38~44쪽
초록
Surface texturing of micro-dimples has been used in many manufacturing industries to reduce frictionbetween two sliding contacted surfaces. Surface texturing decreases the frictional force owing to minimizingof the sliding contact area. In this paper, micro-dimples have been fabricated on an Al6061-T6 surface usinga two-frequency elliptical vibration texturing (TFEVT) method. A high-frequency of 18 kHz andlow-frequency of 250 Hz were applied to an elliptically-vibrated tool holder. The Stribeck curve was plottedto analyze the friction coefficient trends. Furthermore, the representative wetting index, such as the watercontact angle (WCA), was measured by considering the friction coefficient. WCA is associated withmicro-dimple density and associated parameters. Consequently, the dimpled surfaces with a low frictioncoefficient exhibited a relatively high WCA in the feed direction. According to the Stribeck curve, thedimpled surfaces demonstrate superior friction performance for mixed-film lubrication compared to thenon-textured surface.
Abstract
Surface texturing of micro-dimples has been used in many manufacturing industries to reduce frictionbetween two sliding contacted surfaces. Surface texturing decreases the frictional force owing to minimizingof the sliding contact area. In this paper, micro-dimples have been fabricated on an Al6061-T6 surface usinga two-frequency elliptical vibration texturing (TFEVT) method. A high-frequency of 18 kHz andlow-frequency of 250 Hz were applied to an elliptically-vibrated tool holder. The Stribeck curve was plottedto analyze the friction coefficient trends. Furthermore, the representative wetting index, such as the watercontact angle (WCA), was measured by considering the friction coefficient. WCA is associated withmicro-dimple density and associated parameters. Consequently, the dimpled surfaces with a low frictioncoefficient exhibited a relatively high WCA in the feed direction. According to the Stribeck curve, thedimpled surfaces demonstrate superior friction performance for mixed-film lubrication compared to thenon-textured surface.
- 발행기관:
- 한국기계가공학회
- 분류:
- 기계공학