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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.
이민성(Lee Minsung),정연일(Chung Younil),정기석(Chung Gisuk),한성수 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, light weight wheel rim, one of the automotive chassis part, was developed using TWIP(Twinning Induced Plasticity) steel. TWIP steel has advantage to achieve complex cross section due to the excellent formability. An optimal design of wheel rim was suggested from the parametric study of design variables : distance of mounting groove, bead radius, position and the number of beads. The beads were added in the circumference direction of a rim surface to enhance the stiffness. The structure and durability analysis were performed with FEA in order to verify its performance. Adding beads around a wheel rim could be a dominant factor to reduce maximum stress and improve fatigue life under radial load. The hydroforming process for manufacturing a wheel rim with enhanced stiffness and reduced weight is proposed.