Tribology Characteristics in 300 μm of Hexagonal Array Dimple Pattern
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In the tribological performance of materials, a textured surface reduces the friction coefficient and wear. This study investigates the effects of a pattern of 300 μm dimples in a hexagonal array on the tribological characteristics. Previous studies investigated 200 μm dimples by using a similar material and method. There are three frictional conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction. In this experiment, we investigated the frictional characteristics by conducting frictional tests at sliding speeds ranging from 9.6 rpm to 143.3 rpm and a normal load ranging from 13.6 N to 92 N. We used a photolithography method to create dimples for surface texturing. We used five specimens with different dimple densities 10%, 15%, 20%, 25%, and 30% in this study. The dimple density on the surface area is one of the important factors affecting the friction characteristics. The duty number graph indicates a fully developed fluid friction regime. Fluid friction occurs at a velocity of 28.7-143.3 rpm. We observed the best performance at a dimple density of 10% and a dimple diameter of 300 μm in the hexagonal array, the lowest friction coefficient at 0.0037 with 9.6 rpm 9.6N load, and the maximum friction coefficient at 0.0267 with 143.3 rpm 92N load.
Abstract
In the tribological performance of materials, a textured surface reduces the friction coefficient and wear. This study investigates the effects of a pattern of 300 μm dimples in a hexagonal array on the tribological characteristics. Previous studies investigated 200 μm dimples by using a similar material and method. There are three frictional conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction. In this experiment, we investigated the frictional characteristics by conducting frictional tests at sliding speeds ranging from 9.6 rpm to 143.3 rpm and a normal load ranging from 13.6 N to 92 N. We used a photolithography method to create dimples for surface texturing. We used five specimens with different dimple densities 10%, 15%, 20%, 25%, and 30% in this study. The dimple density on the surface area is one of the important factors affecting the friction characteristics. The duty number graph indicates a fully developed fluid friction regime. Fluid friction occurs at a velocity of 28.7-143.3 rpm. We observed the best performance at a dimple density of 10% and a dimple diameter of 300 μm in the hexagonal array, the lowest friction coefficient at 0.0037 with 9.6 rpm 9.6N load, and the maximum friction coefficient at 0.0267 with 143.3 rpm 92N load.
참고문헌 (15)
- 최원식, "Tribology Characteristics in 200 μm of Hexagonal Array Dimple Pattern", 한국윤활학회지, 31(2), pp.50~55 (2015), 한국윤활학회[DOI]
- Cho, M. H., "Micro CNC surface texturing on Polyoxymethylene(POM)and its tribological performance", Tribology International, 44, pp.859~867 (2011)
- Nakada, M., "Trends in engine technology and tribology", Tribology International, 27(1), pp.3~8 (1994)
- Fanming, M., "Study on effect of dimples on friction of parallel surfaces under different sliding conditions", Applied Surface Science, 256, pp.2863~2875 (2010)
- Scaragi, M., "Minimize friction of lubricated laser-microtexture-surface by tunning microholes depth", Tribology International, 75, pp.123~127 (2014)
- Wakuda, M., "Effect of surface texturing on friction reduction between ceramic and steel materials under lubricated sliding contact", Wear, 254, pp.356~363 (2003)
- Kato, A., "An analysis of friction reduction techniques for the direct-acting valve train system of a new-generation lightweight 2-Liter V6Nissan engine", SAE Paper, 940992 (1994)
- Ronen, A., "Friction-reducing surface texturing in reciprocating automotive components", Tribology Transaction, 44(3), pp.359~366 (2001)
- Hamilton, D. B., "A theory of lubrication by micro-irregularities", J. of Basic Engineering, pp.177~185 (1966)
- Kim, D. H., "Anisotropic tribological properties of the coating on magnetic recording disk", This Solid Films, 360, pp.187~194 (2000)
- Etsion, I., "Analytical and experimental investigation of laser-textured mechanical seal faces", Tribology Transactions, 42(3), pp.511~516 (1999)
- Wang, X., "The lubrication effect of micro-pits on parallel sliding faces of SiC in water", Lubrication Engineering, 36(3), pp.27~34 (2002)
- Choi, W. S., "Friction characteristics of hexagonal array micro scale dimple pattern by density", J. Korean Soc. Tribol. Lubr. Eng, 21(6) (2008)
- Jacobson, B., "The Stribeck memorial lecture", Tribology International, 36, pp.781~789 (2003)
- Woydt, M., "The history of the Stribeck curve and ball bearing steels : The role of Adolf Martens", Wear, 268, pp.1542~1546 (2010)