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Development of aluminum subframe applied for extrusion and sheet forming Process
Gyewon Jang(장계원),Woosik Lee(이우식),Taewoo Kwon(권태우),Kaehee Oh(오경희),Daeup Kim(김대업) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The aluminum subframe was developed using by extrusion and forming, press stamping and welding. To achieve over 30% weight reduction compared to steel subframe and ensure structural strength and endurance, we performed forming simulation about several cross sections and the optimum design of cross section of extruded member could be determined. And we have developed high strength aluminum alloy for extruded member. For alloy development with optimum characteristics, change of tensile strength and elongation was observed according to Mg and Si contents. In addition, we tried to establish optimum aluminum welding conditions for good penetration depth and few pore defects, finally the prototype of aluminum subframe was assembled by using MIG welding. For evaluation of subframe, we have carried out durability test and buckling test etc. the results was considerable for our specification.
Extruforming 공법 적용부품 소재분석 및 전용 압출재 개발
장계원(Gyewon Jang),이우식(Woosik Lee),박상우(Sangwoo Park),김대업(Daeup Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Aluminum extruded profiles have been mostly used only a few automotive parts until now, such as roof rail, sunroof frame and bumper beams. However, Aluminum Extruforming technology, which was recently developed by foreign advanced manufacturer, made it possible to apply the aluminum extruded profiles to suspension parts of passenger and RV cars. It could be obtained by optimized billet casting, extrusion and stretch bending technology. In results from analysis of Chevrolet Malibu RLCA, it was aluminium alloy of 6082 and treated T6. Based on such results, we have developed aluminium alloy for extruforming. For alloy development with optimal characteristics, change of tensile strength and elongation was observed according to Mg and Si contents. In results, by increasing Mg contents, Tensile strength increased and elongation was hardly changed. Also by increasing Si contents, tensile strength was decreased and elongation was hardly changed. And mechanical properties of extruded profile and thickness of recrystallization layer didn't fall greatly compared with foreign automotive parts applied for extruforming.
장계원(Gyewon Jang),이우식(Woosik Lee),김대업(Daeup Kim),전진화(Jinhwa Jeon),오개희(Kaehee Oh) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Aluminum extruded profiles have been mostly used only a few automotive parts until now, such as roof rail, sunroof frame and bumper beams. However, Aluminum extruded materials have been being increased in suspension parts, especially, lower control arm. Most of aluminum suspension parts could be obtained by extrusion and stretch bending and forming technology but the cost of production is a bit high due to complex forming process. In this paper, Curvature extrusion technology was applied for cost reduction and higher quality guarantee by removing forming process. It was fabricated curved extruded profile used by curvature extrusion equipment for removing bending process and designed control arm with optimized profile for taking off forming process. For curvature extrusion and excellent quality it was optimized extrusion condition by controlling and combining extrusion speed and traverse moving speed and distance. For check of durability of control arm, it was carried out endurance test and the result was satisfied.
최훈영(Hunyoung Choi),박병철(Byeogcheol Park),이기동(Gidong Lee),장계원(Gyewon Jang),이우식(Woosik Lee),김헌영(Heonyoung kim) 한국자동차공학회 2007 한국자동차공학회 Workshop Vol.2007 No.-
In recent years, the use of aluminum for automobile parts has been increased due to greater demand for weight reduction. For even strongly demand, it is necessary to reduce manufacturing costs and improve product quality. Hot Air Forming is a method for forming circular aluminum tubes using hot air. In order to form complicated closed-sectional aluminum components, hot and high pressure air was applied into aluminum tubes with elevated temperature. The result of this study shows that the elevated temperature, axial feeding speed and air pressure makes a significant influence on a formability of aluminum tubes.