자동조심 롤러 베어링의 재제조 공정 및 피로수명 향상
Remanufacturing Process and Improvement in Fatigue Life of Spherical Roller Bearings
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참고문헌
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초록
This study proposes a sustainable bearing remanufacturing process using the ultrasonic nanocrystalsurface modification (UNSM) technique. The UNSM technique is a newly developed and sophisticated surfacemodification technique that can increase the mechanical properties and improve the friction and wear performanceof materials. Taking advantage of the bearing manufacturing process is the most significant way ofoptimizing the life of a bearing. The proper maintenance and usage of repaired bearings can increase their lifeto be equal to or greater than that of new bearings. This paper discusses the restoration of certain mechanicalproperties of worn, damaged, and discarded bearings, and suggests a remanufacturing process for used bearings,which can impart them with a lifespan equivalent to that of new bearings. The most damaged part of the discardedbearings is the raceway, which is the site of accumulated fatigue. The existing polishing or barrel finishingprocesses can recover the accumulated fatigue only partially. Rolling contact fatigue tests performed on UNSMtreatednew and used specimens polished after 4×106 cycles reveal that UNSM-treated new specimens exhibit thelongest fatigue life compared to other specimens. This study verifies the proposed complete fatigue recovery process,which can increase the fatigue life of used bearings to a level greater than that of new bearings.
Abstract
This study proposes a sustainable bearing remanufacturing process using the ultrasonic nanocrystalsurface modification (UNSM) technique. The UNSM technique is a newly developed and sophisticated surfacemodification technique that can increase the mechanical properties and improve the friction and wear performanceof materials. Taking advantage of the bearing manufacturing process is the most significant way ofoptimizing the life of a bearing. The proper maintenance and usage of repaired bearings can increase their lifeto be equal to or greater than that of new bearings. This paper discusses the restoration of certain mechanicalproperties of worn, damaged, and discarded bearings, and suggests a remanufacturing process for used bearings,which can impart them with a lifespan equivalent to that of new bearings. The most damaged part of the discardedbearings is the raceway, which is the site of accumulated fatigue. The existing polishing or barrel finishingprocesses can recover the accumulated fatigue only partially. Rolling contact fatigue tests performed on UNSMtreatednew and used specimens polished after 4×106 cycles reveal that UNSM-treated new specimens exhibit thelongest fatigue life compared to other specimens. This study verifies the proposed complete fatigue recovery process,which can increase the fatigue life of used bearings to a level greater than that of new bearings.
참고문헌 (6)
- Effect of Rolling Bearing Refurbishment and Restoration on Bearing Life and Reliability, "Zaretsky, E. V", NASA, 2005, NASA[DOI]
- Lee, C. S, "Study of Inner Micro Cracks on Rolling Contact Fatigue of Bearing Steels Using Ultrasonic Nano-crystal-Line Surface Modification", Key Engineering Materials, 462-463, pp.979~984 (2011)
- Pyun, Y. S, "Method for remanufacturing of bearing", Sun Moon University., KR Patent No. 10-1341100, ~ (2013)
- Darisuren, S, "Spherical Roller Bearing Re-manufacturing Process Development", Proceedings of the elementary Korean Society for Precision Engineering, pp.931~932 (2012)
- 추효준, "거친 표면의 접촉피로 수명예측", 한국윤활학회지, 21(3), pp.136~141 (2005), 한국윤활학회
- Kim, J. H, "Bearing fatigue layer restoration by application of micro cold forging technology", Korean Society of Mechanical Engineers, pp.21~25 (2012)