In order to improve the tribological properties of thermomechanically highly stressed surfaces such as cylinder liners, microdimples are produced by fly-cutting kinematics along the functional surface. The structures are used to hold back lubricant but also to increase the hydrodynamic pressure, which is built up between the sliding friction partners. For that, machining strategies for the pattern generation in cylindrical components are developed as well as a mathematical model of the microdimple arrangement and distribution. The tribological performance of the machined microdimples is analyzed by means of ring-on-disk experiments. At low sliding speeds the friction coefficient can be decreased clearly by microdimples. This indicates the potential for low-speed or reciprocating tribosystems like cylinder liners. This potential is quantified by motor driven experiments and the comparison between structured and nonstructured cylinder liners. A honed (fine) liner with additional microdimples along the interstice area shows friction losses up to 19% compared to standard honed nonstructured cylinder liner.
Efficient Machining of Microdimples for Friction Reduction
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO AND NANO-MANUFACTURING. Manuscript received October 4, 2012; final manuscript received January 22, 2013; published online March 25, 2013. Assoc. Editor: Stefan Dimov.
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Denkena, B., Köhler, J., Kästner, J., Göttsching, T., Dinkelacker, F., and Ulmer, H. (March 25, 2013). "Efficient Machining of Microdimples for Friction Reduction." ASME. J. Micro Nano-Manuf. March 2013; 1(1): 011003. https://doi.org/10.1115/1.4023757
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