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2000cc 이하급 가솔린엔진 흡배기밸브 수명복원 기초 기술 개발
김학두(Hakdoo Kim),카유모브 라빌(Kayumov Ravil),김준형(Junhyung Kim),편영식(Youngsik Pyun) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
During normal operation Internal Combustion Engine (ICE) valves exposed to high pressure and high temperature. For this reason SUH11, SUH35 heat resisting steels are used for valve manufacturing in S. Korea. The main failure modes are neck bending and face fracture. For the purpose of fatigue life restoration through improving surface hardness and residual strength Ultrasonic Nano Surface Modification (UNSM) was applied. Effect of UNSM treatement on valve fatigue life restoration is studied by two methods. Nitrided SUH11, SUH35 specimen were prerun until 70% and 63% of average fatigue life, treated with UNSM and run to break on Rotary-bending test equipment. Second approach employed actual engine valves treated with UNSM and tested for Wear and Friction by Pin-on-Disk method. Data showed restoration of fatigue life of steel specimen and fatigue life improvement of actual valves.
대형 상용차용 인젝터 볼 밸브의 수명 복원 기초 기술 개발
다리스렝 스르멩닥와(Shirmendagva Darisuren),편영식(Youngsik Pyun),김준형(Junhyong Kim),카유모브 라빌(Ravil Kayumov) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Significant wear occurs in the ball valve of heavy duty diesel injectors. This wear is due to the continuous contact stress. For this reason injector must be periodically changed. Although used injectors can be reused, used ball valves must be replaced by new set. The other option until now was ball valve seat polishing to remove cracks around the valve orifice, which does not provide full recovery. In this research, as a part of development of the basic method of injector parts restoration, UNSM technology was applied to the ball valve seat to remove cracks, enhance surface properties and restore valve’s life. Ball-on-Disk wear tests were carried out on untreated and treated specimens. Results are compared. The possibility of used injector parts restoration process is established and explained.