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Open AccessArticle

Bearings Downsizing by Strength Enhancement and Service Life Extension

Department of Mechanical Engineering, Sun Moon University, Asan 31460, Korea
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Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1662; https://doi.org/10.3390/ma11091662
Received: 14 July 2018 / Revised: 29 August 2018 / Accepted: 7 September 2018 / Published: 8 September 2018
(This article belongs to the Special Issue Damage and Mechanical Properties of Steels)
Slim bearings are used widely in aircrafts, robots, wind turbines, and industrial machineries, where their size and weight are very important for the performance of a system. The common materials of slim bearings for robots and industrial machineries are based on SAE52110 bearing steel, and special heat treatment and a super polishing process are used and adapted to improve the rolling contact fatigue (RCF) strength of bearings. The improvement in RCF strength, depending on contact stress, surface hardness, and the friction behavior before and after ultrasonic nanocrystalline surface modification (UNSM) treatment was validated. Simple analysis shows that these improvements can reduce the size and weight of slim bearings down to about 3.40–21.25% and 14.3–26.05%, respectively. Hence, this UNSM technology is an opportunity to implement cost-saving and energy consuming super-polishing, a heat treatment process, and to reduce the size and weight of slim bearings. View Full-Text
Keywords: bearing; rolling contact fatigue strength; ultrasonic nanocrystalline surface modification (UNSM); hardness; roughness; super-polishing bearing; rolling contact fatigue strength; ultrasonic nanocrystalline surface modification (UNSM); hardness; roughness; super-polishing
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Amanov, A.; Darisuren, S.; Pyun, Y.-S. Bearings Downsizing by Strength Enhancement and Service Life Extension. Materials 2018, 11, 1662.

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