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자동차 Cowl Cross Bar Hydroforming 적용 최적화 연구
엄인섭(Inseob Um),나상묵(Sangmuk Na),김윤규(Yungyu Kim),김효섭(Hyoseob Kim),박두수(Dusu Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Recently, Hydroforming has been applied to manufacture in various parts of automobile. A cowl cross bar is important part in the automobile that supports the cockpit module and protect passenger on impact The purpose of this study is to optimize the shape of cowl cross bar using FEA Comparative analysis between conventional cowl cross bar and hydroformed cowl cross bar has been done in view of weight-saving, structural performance and formability Finally, optimized shape of cowl cross bar has been proposed.
장종민(Jongmin Jang),김윤규(Yunkyu Kim),나상묵(Sangmok Na) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
There are several types in rear suspension of passenger cars. The torsion beam suspension type is widely used for small passenger cars due to simplicity and lightweight To develop the torsion beam axle, it is necessary to estimate of the characteristics of rear suspension from the design process. The characteristics estimation of the tubler torsion beam axle is preformed using Finite Element Analysis and apply to shape optimization. In this study, static analysis, roll stiffness of the torsion beam axle were predicted by Finite Element Analysis.
전유택(Jeon, Yoo-Taek),정경우(Chung, Kyeong-Woo),나상묵(Na, Sang-Mook) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Bipolar plate is the main part with MEA in automotive PEMFC. It must have a good electrical conductivity and excellent corrosion resistance, be cost effective. Therefore, stainless steels have been studied by many researchers because of its corrosion resistance and cost benefits. But their properties are not sufficient for the application to bipolar plate for automotive PEMFC. In this work, we have performed stamping using various commercial stainless steels to select candidate material for biploar plate and to derive design parameters for stamping simulation. The results showed that a small curvature at the corner of flow field is more favorable due to easier a plastic deformation. Stamping process was simulated by changing surface condition, and the size and angle of channel. The optimum shape and spring back phenomena were evaluated. Surface coating was applied to increase the corrosion resistance and electrical conductivity of stainless steel. The electrical interfacial resistance was 10 to 15m{Omega}cm² under clamping force of 150psi. But corrosion resistance of coating on the stainless steel was not good due to the unstableness of microstructure.
하이드로포밍을 이용한 대형차 앞차축 형상최적화에 관한 연구
장종민(Jongmin Jang),김윤규(Yungyu Kim),허주행(Joohaeng Hur),나상묵(Sangmook Na) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.3
Recently, The Hydroforming technology has recognized general technique in manufacture industry. Especially automotive industry, It has applied to increase strength, and decrease weight, cost and part number. The rigid axle suspension type is widely used for truck and bus in commercial vehicles due to simplicity. To develop the hydroforming rigid axle, it is necessary to estimate of the characteristics of front suspension from the design process. In this study , the characteristics estimation of the hydroforming rigid axle is preformed using Finite Element Analysis and apply to shape optimization.
BAF 열처리조건 변화에 따른 심가공용 자동차강판의 기계적 특성
박근웅(Keun Woong Park),문만빈(Man Been Moon),나상묵(Sang Muk Na),남궁성(Sung Nam Koong) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The annealing process can improve the physical performance of cold rolling steel sheets and increase the added value of products. Batch annealing, characterized by a long heating cycle and low heating temperatures, is widely used to produce steel sheets like automobile cold rolled steel sheets and sheets used for the manufacture of automobile parts. We developed a BAF simulator to estimate the effects of BAF conditions on the mechanical properties of deep drawing steel sheet. Conditions for the batch annealing process consist of various annealing time and temperature. DDQ CR steel sheets require a yield strength (≤16.5㎏/㎟). tensile strength (28~33㎏/㎟) and elongation (≥46%). These mechanical properties are effected more by changes in the annealing temperature than in the annealing time.
35R급 고장력강판의 기계적특성에 미치는 BAF조건의 영향
박근웅(Keun Woong Park),문만빈(Man Been Moon),나상묵(Sang Muk Na),남궁성(SungNam Koong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Annealing can improve the physical performance of cold rolling steel sheet and increase the added value of products. And batch annealing characterized by a long heating cycle and low heating temperature is widely used to produce sheet steels including automobile cold rolled steels and automobile parts. We developed BAF simulator to estimate the effects of BAF conditions on the mechanical properties of 35R High Strength steel sheet. The conditions in batch annealing process consist of various annealing time and temperature. 35R CR steel sheet is required as yield strength (20~30㎏/㎟), tensile strength(35~40㎏/㎟) and elongation(≥38%). Mechanical properties are more susceptible of the annealing temperature than of the annealing time.