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Yasutoshi Tominaga,Jinsoo Kim,편영식,Ravil Kayumov,김준형,Juha Woo 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.10
Crankshaft translates reciprocating linear piston motion into rotation in internal combustion engine. So it receives complex combination of stresses. Therefore, crankshaft remanufacturing process is designed thoroughly with special attention to fatigue and tribological performance. Experimental study is carried out in order to show that UNSM (ultrasonic nanocrystal surface modification) technology which will be used as final surface treatment after 0.2 mm depth surface grinding, could restore original fatigue strength and tribological performance. Furthermore the feasibility steady to replace conventional overlay welding in crankshaft remanufacturing process by UNSM (ultrasonic nanocrystal surface modification) technology is carried out. Effects of UNSM technology are established through rotary bending test, rolling contact fatigue (RCF) test and wear simulation test. The test specimen used SCM435 material of crankshaft and commercial bush. The test result showed fatigue limit improved by 30% and RCF life increased by 40% for UNSM treated specimen. And friction coefficient decreased by 24% and wear amount decreased by 85%.
고속철도용 Antiroll-bar ass'y 국산화 개발
도미나가 야스토시(Yasutoshi Tominaga),편영식(Young-Sik Pyun) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Antiroll-bar assembly is a precision component designed to control rolling of railway cars. It is important for safe and comfortable ride. Torsion bar is main part of antiroll-bar assembly. Now this part is classified as consumable and imported in Korea from France. Therefore it is necessary, in accordance with Korean environment, to develop domestic torsion bar to reduce cost and improve quality. In this study, development of antiroll bar is analyzed and tested by using road histogram measured on Korean railroads. The comparison with imported bar is drown showing satisfactory results. New design features a ring cover made of SUS steels for corrosion prevention of torsion bar. The safety is examined by CAE analysis and wear tests. As a result, design change did not inflict significant difference in static and fatigue safety. Two different SUS steels were analyzed to determine the best suitable for wear resistance.
도미나가 야스토시(Yasutoshi Tominaga),편영식(Young-Sik Pyun),김동일(Dong-Il Kim),최도현(Do-Hyun Choe) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.9
Antiroll-bar Assembly는 철도 차량의 롤링을 제어하도록 설계된 정밀 부품이고 안전과 편안한 승차감을 위해 중요하다. Antiroll-bar Assembly의 주부품인 토션바는 소모품으로써 프랑스에서 전량 수입되고 있다. 따라서 비용절감과 성능향상을 위해 국내 환경에 적합한 토션바 국산화 개발이 필요하다. 본 연구에서는 국내 철도에서 측정된 로드 히스토그램을 활용하여 개발된 토션바에 대한 해석 및 시험을 진행하였고, 수입품과의 비교 시험 결과 만족할만한 결과를 얻었다. 또한 토션바의 부식현상을 방지하기 위해서 스테인리스강 소재의 Ring cover를 씌울 수 있도록 설계를 변경하였다. 변경된 설계 안전성은 CAE해석과 마모시험을 통해서 검증하였다. 이 결과 설계변경에 의한 정적 및 피로에 대한 안전성은 큰 차이가 없었다. 그리고 2종류의 스테인리스강 중에서 내마모성이 우수한 소재를 채택하였다. An antiroll-bar assembly is a precision component that is designed to control the rolling of railway cars. It is important for ensuring a safe and comfortable ride. A torsion bar is the main part of the antiroll-bar assembly. Now, this part is classified as a consumable, and it is imported into Korea from France. Therefore, there is a strong need to domestically develop a torsion bar suitable for Korean conditions and to reduce cost and improve quality. In this study, an antiroll bar is developed, and it is analyzed and tested by using a road histogram measured on Korean railroads. This bar shows satisfactory results in a comparison with the imported bar. It has a novel design featuring a ring cover made of SUS steels to prevent the corrosion of the torsion bar. Its safety is examined through CAE analysis and wear tests. It is found that its design does not result in a significant difference in static and fatigue safety. Two different SUS steels were investigated in terms of their wear resistance, and the best one was adopted.