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회주철 브레이크 디스크 표면 미세조직 형상에 따른 절삭가공 특성 연구
이관형(Kwanhyeong Lee),김동민(Dongmin Kim),윤형준(Hyungjoon Youn),김동익(Dongik Kim),이흥주(Heungjoo Lee),이익희(Ikhee Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In this study, research the mechanism how machinability decrease on the brake disc surface along the state of skin layer microstructure. Representatively, It has been caused by free-ferrite rim and a few kind of carbide and oxide what existing about 0.3㎜ maximum from the surface. Free-Ferrite bring worse machining condition by making lower hardness and toughness increasing on the near surface, and also creating the diffusion wear in case of cutting with CBN bite. Furthermore, Oxide and carbide precipitate make harmful chipping on the both tool and work pieces. As a result, tool life has rapidly decreased based on these of complex reasons. Point of this study is finding out the correlationship between cutting force and abrasion characteristic when is given difference microstructure on skin layer by every 0.1㎜ depth from near surface.
김동익(dongik Kim),이흥주(heungjoo Lee),구광모(kwangmo Koo),윤형준(hyoungjun Yun) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
A lot of studies are being conducted around the world for the improvement of vehicle’s fuel efficiency. Especially, The required strength and performance of the U Joint assembly component that transfers the steering force by driver to the steering gear were developed to be suitable to each function by developing manufacture technology such as Aluminum forging, Aluminum extrusion, Hydro-forming. For the robust design, CAE analysis was executed after the initial concept design and the result of CAE analysis was applied to other designs, thereby the optimum design was accomplished. We have made the Aluminum U-Joint assembly component which is 43% lighter than the steel U-Joint assembly component. We confirmed the possibility that the Aluminum U-Joint could be applied to a high grade fuel cell vehicle.
이흥주,김준범 한국공업화학회 2005 응용화학 Vol.9 No.1
Hydrogen ion is combined with water to form hydronium ion [H₃O^+] and pass through membrane resulting electricity generation. Thus, water vapor is added to supplied gas to maintain membrane conductivity. Humidifying gas is energy consuming process and needs many kinds of component. No humidifying condition could be applied in small scale fuel cell to improve efficiency and reduce system cost. However, it is difficult to operate large scale fuel cell without humidifying and especially higher than 50~60℃ according to the result presented in this paper. Compact field point(cFP) device is used to control fuel cell test station and acquire data as excel file. Automatic shut down logic was made using LabVIEW to avoid cell failure in case of sudden voltage drop. Performance mapping experiments were done at various anode and cathode relative humidity condition. The performance of no humidifying condition on anode was better than that of cathode. Further experiment is on going to analyze the above newly found phenomena.