http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
질소이온코팅 SCM415강의 마찰ㆍ마모특성에 관한 연구
류성기(Sungki Lyu),하휘파(HuiBo He),이상현(Sanghyun Lee),이동규(Donggyu Lee),손유선(Yusun Son) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
SCM415 alloy was implanted with nitrogen ions using plasma source ion implantation(PSII), at a dose range of 1×10 to 6×10¹?N?㎝?². Auger electron spectrometry(AES) was used to investigate the depth profile of the implanted layer. Friction and wear tests were carried out on a block-on-ring wear tester. Scanning electron microscopy(SEM) was used to observe the micro-morphology of the worn surface. The results revealed that after being implanted with nitrogen ions, the frictional coefficient of the surface layer decreased, and the wear resistance increased with the nitrogen dose. The tribological mechanism was mainly adhesive, and the adhesive wear tended to become weaker oxidative wear with the increase in the nitrogen dose. The effects were mainly attributed to the formation of a hard nitride precipitate and a supersaturated solid solution of nitrogen in the surface layer.
질소이온코팅 SCM415강의 마찰ㆍ마모특성에 관한 연구
류성기(Sungki Lyu),하휘파(HuiBo He),이상현(Sanghyun Lee),이동규(Donggyu Lee),손유선(Yusun Son) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
SCM415 alloy was implanted with nitrogen ions using plasma source ion implantation(PSII), at a dose range of 1×10 to 6×10¹?N?㎝?². Auger electron spectrometry(AES) was used to investigate the depth profile of the implanted layer. Friction and wear tests were carried out on a block-on-ring wear tester. Scanning electron microscopy(SEM) was used to observe the micro-morphology of the worn surface. The results revealed that after being implanted with nitrogen ions, the frictional coefficient of the surface layer decreased, and the wear resistance increased with the nitrogen dose. The tribological mechanism was mainly adhesive, and the adhesive wear tended to become weaker oxidative wear with the increase in the nitrogen dose. The effects were mainly attributed to the formation of a hard nitride precipitate and a supersaturated solid solution of nitrogen in the surface layer.
The Study on the Analytical Prediction of Bearing Life and Load Distribution for Plugin HEV
Qi Zhang(장기),Zhezhu Xu(허철수),Sungki Lyu(류성기) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
The transportation is almost dependent on a single fuel petroleum with transportation energy dilemma. Hybrid Electric Vehicle(HEV) technology holds more advantages on efficiency improvements for petroleum consumption at the transportation. And bearing is recognized as the important component of gearbox. Gearboxes for HEV transmission have been ensured the highest reliability over some years in withstanding high dynamic loads. At the same time, the demands of lilghweight design and cost minimization are required by thought-out design, high-quality material, superior production quality and maintenance. In order to design a reliable and lightweight gearbox, it is necessary to analyze bearing rating life methods between standard and different bearing companies with calculation methods for modification factors. In this paper, the influence of life time of bearings will be pointed out. Bearing contact stress and load stress distribution of HEV gearbox are obtained and compared with Romaxdesigner and BearinX. And the unequal wear of the left bearing for the gearbox internediate shaft is investigated between simulation and test.
우위팅(Yu-Ting Wu),진진(Zhen Qin),이윤승(Yunseung Lee),류성기(Sungki Lyu),백승호(Seoungho Back),박상후(Sanghu Park) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.8
분말을 친환경적이고 정량적으로 공급하기 위하여 본 논문에서는 노벨 분말 공급 장치의 설계를 제안하고 그 메커니즘 설계 원리에 대해 분석한다. 장치내 분말의 유동 특성을 관찰하기 위하여 분유를 연구 대상으로 선정하였다. 분말 입자 사이의 공극률과 충돌효과를 고려하여 유동영역 내에서 고밀도의 입자 유동 모델을 구축하였으며 Fluent를 활용하여 순간적인 CFD 시뮬레이션을 수행하였다. 무거운 하중을 받는 장치의 구조적 안전성을 고려하여 일련의 유한요소법 기반 구조 강도의 시뮬레이션을 실시하고 메커니즘의 신뢰성을 검증하였다. 또한 3D 프린터를 활용하여 분말 공급 장치의 시제품을 제작하였으며 섭취량 실험을 수행하였다. 결론적으로 제안된 분말 공급 장치는 내부 유동 특성, 구조적 안전성, 실제 분말 공급의 정량 정밀성 등 측면에서 만족스럽다고 평가할 수 있다. 본 연구에서 사용된 설계 및 검증 방법과 다양한 메커니즘의 설계를 위한 유용한 이론을 제시하였다. To precisely feed powders or particles in an environmentally friendly manner, a novel apparatus for powder feeding is proposed. The kinematics and design principles of the mechanism were analyzed. To observe the flow characteristics of the powder in the apparatus, milk powder was selected as the study object. By considering the voidage and collision effect between particles, the dense discrete phase method–discrete element method collision model was established and investigated based on the commercial computational fluid dynamics software ANSYS Fluent. To observe the structural stability of the proposed apparatus under an extreme load condition, a series of finite-element-method-based structural simulations were implemented and the reliability of the design was verified. A prototype was made based on three-dimensional printing technology, and the feeding precision was compared with that of the traditional measuring spoon. The design was satisfactory in terms of flow characteristics, structural safety, and quantitative feeding. The design and investigation methods used in this study can provide an important theoretical reference for the design of a variety of apparatus.
손유선(Yusun Son),황규석(Guesec Hwang),탁성훈(Seonghun Tak),류성기(Sungki Lyu) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study deals with the TE(Transmission Error) of gear tooth profile by modifying a profile and lead of a surface of tooth. First, we experimentally confirmed that the TE is a synthesis of the sliding velocity between both gears. Since various types of TE appear in the experiments, we introduced definition of transmission error and the optimism design by modifying a surface parameters. The test stand's performance is then evaluated through a series of multiple torque transmission error tests. Comparisons are made between data recorded before and after the test stand's redesign, and subsequently repeatability studies are performed to verify the veracity of the measured data. Finally, the experimental results are compared to the analytical predictions of two different gear analysis programs.
17cc급 자동차용 압축기의 고체윤활 최적화 및 구조 설계에 관한 연구
양용군(Yong-Kun Yang),진진(Zhen Qin),최요한(Yeo-Han Choi),류성기(Sungki Lyu) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.12
Fuel economy has always been a major issue in the automobile industry, especially owing to the associated environmental concerns. It is widely known that only 5-20% of the energy generated by automobiles running on internal combustion engine engines is used as power, while the rest is consumed because of friction between components. The main components of the reciprocating piston type compressor used in vehicles, such as the shaft, swash plate, piston, and cylinder, cause severe energy loss owing to frictional contact between each other. The wear contact between the main shaft and the other components is particularly severe. Most quality issues arise owing to the sticking phenomenon that occurs between these parts. In this study, a coating solution to reduce friction is prepared by mixing adhesive solid lubricant, organic binder-polyadimide, inorganic binder (Binder), and graphite in four different ratios, and the best combination is determined.
치형수정에 의한 코니칼 인볼류트 기어의 치면 압축응력 해석
김준성(Junseong Kim),이현수(Hyeonsu Lee),김동욱(Donguk Kim),류성기(Sungki Lyu) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.5
Conical involute gears are being used for marine gearboxes, automotive transmissions, and robots, and so on, but not much. As involute profile gear, conical involute gear not only can be engaged with spur and helical gear but also can be used for power transmission of parallel, crossed and skewed axis with small angle. Hence, conical involute gears are likely to develop in future. Through a study on the basic theory of conical involute gear, tooth surface compressive stress analysis was performed by using commercial modeling program, comparing before and after profile modification. As a result, it noticed that tooth profile modification is able to relieve more tooth surface compressive stress than before modification.