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피스톤 오일 냉각 유로 형태에 따른 수집효율 성능 비교
이정근(Jeong Keun Lee),전상명(Sang Myung Chun),주대헌(Dae Heon Joo),류관호(Kwan Ho Ryu) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.1
In this research, it is investigated the collecting efficiency of jet oil to several types of piston oil cooling gallery by using recently developed PCJ (piston cooling jet) rig tester. So it will be selected for a better design of piston oil cooling gallery. The collecting efficiencies at each type of piston cooling galleries are measured under conditions of a few piston positions, and several oil jet pressures and oil viscosities. Furthermore, the type of jet cone will be compared for a few jet pressure conditions. The selected type of piston oil cooling gallery is planned to be applied to the target engine which is now developing to satisfy the EURO VI emission regulation.
피스톤 오일 냉각 유로의 성능 검증을 위한 리그 시험기 개발
이정근(Jeong Keun Lee),전상명(Sang Myung Chun),주대헌(Dae Heon Joo),류관호(Kwan Ho Ryu),하대홍(Dae Hong Ha) 한국트라이볼로지학회 2009 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.25 No.6
The operation condition of recently designed pistons for high power and high speed diesel engine become more severe due to the increment of combustion pressure and temperature. So, in order to overcome high temperature, the application of the mono-metal cast aluminum alloy piston featuring an enclosed cast-in open cooling gallery has increased. In this research, it is developed a PCJ (piston cooling jet) rig tester, described the test procedure and validated the performance of sample piston cooling gallery design. Then the test rig will be used for developing the design technology of piston cooling gallery. The test rig is composed with oil reservoir and pumping system, oil jet system, piston fixing and moving system, collecting oil measuring system, and data measuring and recording system. It will be measured collecting efficiencies under conditions of a few piston positions, oil jet pressures and oil viscosities for a piston cooling gallery. Furthermore, the PCJ rig tester will be used for the optimum design of the oil cooling gallery which being applied to increase the cooling efficiency of pistons in diesel engines satisfying the EURO V emission regulation and the more.
피스톤 오일 냉각 유로의 성능 검증을 위한 리그 시험기 개발
이정근(Jeong Keun Lee),전상명(Sang Myung Chun),주대헌(Dae Heon Joo),류관호(Kwan Ho Ryu),하대홍(Dae Hong Ha) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
The operation condition of recently designed pistons for high power and high speed diesel engine become more severe due to the increment of combustion pressure and temperature. So, in order to overcome high temperature, the application of the mono-metal cast aluminum alloy piston featuring an enclosed cast-in open cooling gallery has increased. In this research, it is developed a PCJ (piston cooling jet) rig tester, described the test procedure and validated the performance of sample piston cooling gallery design. Then the test rig will be used for developing the design technology of piston cooling gallery. The test rig is composed with oil reservoir and pumping system, oil jet system, piston fixing and moving system, collecting oil measuring system, and data measuring and recording system. It will be measured collecting efficiencies under conditions of a few piston positions, oil jet pressures and oil viscosities for a piston cooling gallery. Furthermore, the PCJ rig tester will be used for the optimum design of the oil cooling gallery which being applied to increase the cooling efficiency of pistons in diesel engines satisfying the EURO V emission regulation and the more.
Spark Plasma Sintering법에 의해 예비 성형된 Al-10Si-5Fe-1Zr 분말합금의 고온 압축변형 거동
박상춘 ( Sang Choon Park ),김목순 ( Mok Soon Kim ),김경택 ( Kyung Taek Kim ),신승용 ( Seung Young Shin ),이정근 ( Jeong Keun Lee ),류관호 ( Kwan Ho Ryu ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.11
Compressive deformation behavior of Al-10Si-5Fe-1Zr (wt%) alloy preform fabricated by SPS(spark plasma sintering) of gas atomized powder was investigated in the temperature range from 380 to 480℃ and at strain rates from 1.0×10?3 to 1.0×100 s?1. Stress-strain curves showed a peak stress (σp) during initial stage of deformation, followed by a steady state flow at all temperatures and strain rates tested. The σp decreased with both increase in temperature and decrease in strain rate. Nearly full densification was found to occur in the compressively deformed specimens irrespective of test condition. TEM observation revealed a restricted grain growth during steady state flow.
초음파 용탕처리를 이용한 알루미늄 피스톤의 조직 미세화
이상화 ( Sang Hwa Lee ),정재길 ( Jae Gil Jung ),이정무 ( Jung Moo Lee ),조영희 ( Young Hee Cho ),윤운하 ( Woon Ha Yoon ),안용식 ( Yong Sik Ahn ),윤동춘 ( Dong Chun Yun ),이정근 ( Jeong Keun Lee ),류관호 ( Kwan Ho Ryu ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.2
The effects of ultrasonic melt treatment on the microstructures of aluminum piston were examined at five observation parts having different cooling rates. The microstructure of aluminum piston consisted of primary Si, eutectic Si, and various types of intermetallic compounds. Regardless of cooling rate, the ultrasonic melt treatment transformed dendritic eutectic cells to equiaxed eutectic cells and it decreased the sizes of eutectic Si and intermetallic compounds that exist at eutectic cell boundaries. In the absence of ultrasonic treatment, coarse primary Si particles were severely segregated and its size was increased with decreasing the cooling rate. The ultrasonic treatment decreased the size of primary Si particles from 25.5~31.0 μm to 17.6~23.1 μm, depending on the cooling rate. In the presence of ultrasonic treatment, relatively fine primary Si particles were homogeneously distributed throughout the piston. In addition, the ultrasonic treatment increased the population density and area fraction of fine primary Si particles.