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이규선(Lee, Kyu-Sun),이근안(Lee, Geun-An),이종섭(Lee, Jong Sup),이영선(Lee, Young-Seon),김정배(Kim, Jeongbae) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
Two experimental apparatus, for measuring the COP of air-conditioning cycle and estimating the reliabilities applying the nano-fluids into the cycle, were designed and made. The air-conditioning cycle components in the apparatus are purchased like as YF hybrid model. The apparatus for measuring the COP of air-conditioning cycle is designed to measure the compressor power and evaporator heat capacity. So, the compressor power will measure using power meter and the evaporator heat capacity have to measure the inlet-outlet temperature, pressure, and mass flow rate using the flow meter. And the nano-fluids to apply the cycle were chosen as Al2O3, TiO2, and CuO. So, the apparatus for estimating the reliabilities applying the nano-fluids into the cycle was consisted of 4 cycles, respectively for base and three nano-fluids. The 2nd apparatus will operate during about 2.2 years to reveal the performance characteristics including compressor power and running results, temperature and pressure.
전동식 Scroll Compressor의 Scroll 열변형 해석
이형욱,김정배,이근안,이종섭,이영선,Lee, Hyoung-wook,Kim, Jeongbae,Lee, Geun-An,Lee, Jong Sup,Lee, Young-Seon 한국교통대학교 융복합기술연구소 2012 융ㆍ복합기술연구소 논문집 Vol.2 No.1
A scroll compressor used in the air conditioning in automobile consists of the fixed scroll and the orbiting scroll. Temperature gradient in the scroll compressor during the operation induces the thermal expansion of two scrolls. Therefore, the gap between scrolls in the initial stage is regarded as an important variable in structural design of the scroll compressor. The coupled thermal-stress analysis was carried out for the scrolls of a scroll compressor. The temperatures of major points of two scrolls in the steady states were referred by the literature of C. Lin. The sequentially coupled thermal-stress analysis is utilized to the heat transfer analysis and the thermal expansion analysis. In the thermal expansion analysis, the contact analysis was considered between the fixed and the orbiting scrolls in order to obtain the penetration distance and the contact pressure between two scrolls. The range of deformation was from 44 to $76{\mu}m$ according to the height of the scroll. The maximum penetration distance of $60{\mu}m$ occurred at the top surface of the fixed scroll in the center of the scroll parts.
이낙규(Nak-Kyu Lee),이혜진(Hye-Jin Lee),최석우(Seogou Choi),이근안(Geun-An Lee) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this paper Research development about a micro metal forming manufacturing system has been developed. A micro forming system has been achieved in Japan and it's developed micro press is limited to single forming process. To coincide with the purpose to be more practical, research and development is necessary about the press which the multi forming process is possible. We set the development of the equipment including micro deep drawing, micro punching and micro restriking process to the goal. To achieve this goal, Research about micro forming process to be related to multi process forming must be preceded first. In last research, the micro pressing module is developed and this module is combined to desktop actuating system. We can get a micro forming process technology from last result. In this paper, the micro metal forming manufacturing system is designed and made with miniaturized size system. A basic metal foil forming experiment is researched using this miniaturized forming system.
압연 클래드된 Ti/Mild steel/Ti 재의 계면확산층과 접합력에 미치는 후열처리온도의 영향
이상목 ( Sang Mok Lee ),김수민 ( Su Min Kim ),위세나 ( Se Na We ),배동현 ( Dong Hyun Bae ),이근안 ( Geun An Lee ),이종섭 ( Jong Sup Lee ),김용배 ( Yong Bae Kim ),배동수 ( Dong Su Bae ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.4
The aim of this study is to investigate the effect of post heat treatment on bonding properties of roll cladded Ti/MS/Ti materials. First grade Ti sheets and SPCC mild steel sheets were prepared and then Ti/MS/Ti clad materials were fabricated by a cold rolling and post heat treatment process. Microstructure and point analysis of the Ti/MS interfaces were performed using the SEM and EDX Analyser. Diffusion bonding was observed at the interfaces of Ti/MS. The thickness of the diffusion layer increased with post heat treatment temperature and the diffusion layer was verified as having (ε+ζ)+(ζ+β-Ti) intermetallic compounds at 700℃ and an (ζ+β-Ti) intermetallic compound at 800℃, respectively. The micro Knoop hardness of mild steel decreased with post heat treatment temperature; however, those of Ti decreased at a range of 500~600 ℃ and showed a uniform value until 800℃ and then increased rapidly up to 900℃. The micro Knoop hardness value of the diffusion layer increased up to 700℃ and then saturated with post heat treatment. A T-type peel test was used to estimate the bonding forces of Ti/Mild steel interfaces. The bonding forces decreased up to 800℃ and then increased slightly with post heat treatment. The optimized temperature ranges for post heat treatment were 500~600℃ to obtain the proper formability for an additional plastic deformation process.
마이크로 박판 밸브 성형을 위한 마이크로 프레스 시스템 개발
이혜진(Hye-Jin Lee),이낙규(Nak-Kyu Lee),최석우(Seogou Choi),이형욱(Hyoung-Wook Lee),이근안(Geun-An Lee) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
In this paper Research development about a micro metal forming manufacturing system has been developed. A micro forming system has been achieved in Japan and it's developed micro press is limited to single forming process. To coincide with the purpose to be more practical, research and development is necessary about the press which the multi forming process is possible. We set the development of the equipment including micro deep drawing, micro punching and micro restriking process to the goal. To achieve this goal, we set the application product to a micro thin foil valve which is used in the micro pump module. The compound die set has been designed and manufactured to make two step process. The material of thin foil valve is SUS-304 and its thickness is 50㎛. We can get a good forming results from micro punching experiments in this paper.
고온 프레스에 의해 제조된 Cu/Al 클래드재의 접합계면 특성에 미치는 표면조도의 영향
이상목 ( Sang Mok Lee ),이종섭 ( Jong Sup Lee ),김용배 ( Yong Bae Kim ),이근안 ( Geun An Lee ),이상필 ( Sang Pill Lee ),손인수 ( In Soo Son ),이진경 ( Jin Kyung Lee ),배동수 ( Dong Su Bae ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.9
This study investigates the effect of surface roughness on bonding interface properties, such as micro hardness, diffusion layer thickness, intermediate phases, bonding strength, etc., in hot pressed Cu/Al clad material for electric conductors. Different surface roughnesses at the bonding surfaces of oxygen free copper (OFC) and Al 1050 matrix materials were obtained by emery paper grinding and buff polishing. The Cu/Al clad materials were prepared by hot-pressing under 200 MPa at 450 ℃ for 15 min. Microstructures of the Cu/Al interfaces were observed using an optical micrograph (OM), a Field Emission Gun-Scanning Electron Microscope (FEG-SEM) and an Energy Dispersed X-ray Analyser (EDX) in order to investigate the effects of surface roughness on the bond properties of the Cu/Al clad materials. A shear fracture test was performed to evaluate the bonding strengths of the Cu/Al clad materials. A Micro Knoop hardness test was used to measure the micro hardness in the diffusion layer at the Cu/Al interface. The 3-layer diffusion layer was observed at the Cu/Al interfaces. The thickness of the diffusion layer decreased and an additional intermediate phase ξ2 was formed with the increase of surface roughness. The Micro Knoop hardness increased rapidly mainly due to the formation of η2 and ξ2 phases and then decreased gradually with the increase of surface roughness. The bonding strength of the Cu/Al interface increased rapidly in the initial stage and increased slowly up to the peak value and then decreased slightly with the increase of surface roughness. The shear fracture surfaces of the Cu/Al bonding interface were flat and had an even shape in the sample with a low surface roughness, but had a rough and uneven shape in high surface roughness conditions.