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준중형급 자동차 엔진용 하이드로포밍 Exhaust Manifold 개발
오진호(Jinho Oh),최한호(Hanho Choi),강연식(YunSik Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
An exhaust manifold, known as the first parts to be hydro formed, is very close to reaching its mass production stage. This is obviously related with tight emission regulation induced by envronmental problems commonly for both domestic and worldwide and standards, thus evoking its solution for domestic automakers. Compared to conventional cast products, thin-gauged tubular hydroformed exhaust manifold have superior features on gas decomposition during engine cold start period by lowering heat sink as well as simplified manufacturing process,i.e., reducing welding process. Aim of this work is to develope of hydroformed exhaust manifold, which includes part, process, and tool design. The performance of the exhaust system is evaluated by computer analysis, such as flow analysis, heat transfer, heat stress and fatigue analysis.
오진호(Jinho Oh),최한호(Hanho Choi) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Suspensions for vehicles are structural devices used for suspending a vehicle body and absorbing shoks from the road. Thus, the suspensions must be designed such that they can attenuate shocks from a road and make passengers feel comfortable despite the shocks, and improve steering stability, determined by the ground contact force of tires during running of vehicles. Another important factor to be considered while designing suspensions is that the suspensions must maintain desired stiffness and desired durability despite the repeated application of shocks from roads thereto. The present relates, in general, to a tubular torsion beam for rear suspensions of vehicles and a manufacturing method thereof and, more particularly, to the provision of tubular torsion beams having excellent roll stiffness and excellent roll strength, produced through hydroforming
오진호(Jinho Oh),최한호(Hanho Choi),김동진(Dongjin Kim),박성호(Sungho Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Vehicle body stiffness/strength and weight are very important factor for crash safety and driving stability. The global steel industry commitment have developed ULSAB(Ultra Light Steel Automotive Body) to meet these requirements of vehicle. The ULSAB is safe, affordable, fuel efficient and environmentally responsible vehicle. Recently, as the underbody part of ULSAB model has been substituted into hydro forming product by posco, the new ULSAB body with the better performance has been developed. In this study, the light and robust ULSAB model are manufactured by using optimization design based on the sensitivity.
하이드로포밍을 이용한 Y자형 스테인리스 배기계 부품 개발
정기석(Gisuk Chung),강연식(Yeonsik Kang),최한호(Hanho Choi) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Y-shapes are commonly used as fitting parts in automotive exhaust manifolds. The parts are usually made of stainless steels 409ℓ, which is rust resistant. Typically, in hydroforming of these Y-shapes, a counter punch is usually used to support the protrusion tip while it is growing. By the way, premature protrusion bursting is delayed and thus increasing the useful height of the protrusion. However, the use of a counter punch adds one more process parameter to be controlled properly with the axial feeds and internal pressure. In this study, the optimal loading path to escape the failure modes(bursting, buckling) is determined and the effects of the process parameters, the internal pressure and axial feeding on the product quality, such as thickness distribution, protrusion height are investigated.
오진호(Jinho Oh),이규민(Gyumin Lee),최한호(Hanho Choi),박성호(Sungho Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
An engine cradle is a quite important structural assembly for supporting the engine, suspension and steering parts of vehicle and absorbing the vibrations during the drive and the shock in the car crash. Recently, the engine cradle having structural stiffness enough to support the surrounding parts and absorbing the shock of collision has been widely used. The hydroforming technology may cause many advantages to automotive applications in terms of better structural integrity of parts, reduction of production cost, weight reduction, material saving, reduction in the number of joining processes and improvement of reliability. We focus on increasing the durability and the dynamic performance of engine cradle. For realizing this objective, several optimization design techniques such as shape, size, and topology optimization are performed. This optimization scheme based on the sensitivity can provide distinguished performance improvement in using hydroforming.
오진호(Jinho Oh),류정수(Jeong-Soo Ryu),김재현(Jaehyun Kim),최한호(Hanho Choi) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.7
일체형 배기다기관은 하이드로 포밍 대량 생산이 가능한 부품으로 국내, 국제적인 환경문제에 따른 배출 규제와 매우 밀접한 관계에 있기 때문에, 국내 완성차 업체에서 큰 관심을 가지고 있다. 일반적인 주조부품과 비교해서 관형 배기다기관은 용접공정 감소에 따른 단순화된 제작 공정 뿐만아니라, 엔진 시동시 가스 분해능이 우수한 특징을 가지고 있다. 본 연구는 부품, 공정, 금형 설계를 포함하는 배기다기관을 개발하는데 목적이 있다. 배기 시스템의 성능은 유동해석, 열전달, 열응력, 내구해석 시뮬레이션을 통해 평가하였다. Exhaust manifolds are the first structures to be developed by hydroforming; mass production of exhaust manifolds by this method will be possible soon. This is obviously related with tight emission regulation induced by environmental problems commonly for both domestic and worldwide and standards, thus evoking its solution for domestic automakers. Compared to conventional cast products, thin-gauge tubular hydroformed exhaust manifold have superior features; for example, in the hydroformed exhaust manifold, gas decomposition during the cold-start period of the engine is reduced by lowering the heat sink, and manufacturing process is simplified since less welding is involved. The aim of this study is to develop a hydroformed exhaust manifold; the study deals with the components, the hydroforming process, and tool design of the manifolds. The performance of the exhaust system is evaluated by performing flow analysis, heat-transfer analysis, heat-stress analysis, and fatigue analysis by using a computer.