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박진기(Jingee Park),박병철(Buyngchul Park),김영석(Youngsuk Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
The application of high strength steels (HSS) for automotive part is growing due to the expectation of considerable weight reduction. Chassis parts, for example control arms and trailing arms, have developed by applying various high strength steels for weight reduction design and increased fatigue durability. Besides, various high strength steels, i.e. dual phase steel (DP), ferrite bainite steel (FB), have been developed by the reduction for good durability as well as press formability. In flanging of high strength steels, edge cracking may occur. This article discussed the effects of edge quality and how it determines edge stretchability, as well as finite element simulation (FEM) for blanking and hole expanding processes. Special attentions are paid on the significance of sheared edge and burr orientation in the hole expansion ratio (HER) of high strength steels. From these studies we concluded that ferrite bainite steel shows better stretch-flangeability in comparison to dual phase steel due to the lower work hardening rate at the sheared edge.
박진기(Jingee Park),박병철(Byungchul Park),박노광(Nhokwang Park),김영석(Youngsuk Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Titanium alloy sheets have excellent specific strength and corrosion resistance as well as good performance at high temperature. Recently, titanium alloys are widely employed not only aerospace parts but also prosthetics and motorcycle. However, titanium and its alloys are difficult-to-form materials due to limited slip system and plastic anisotropy. Titanium alloy sheets were usually formed by slow forming or hot forming with heating die and specimen. In the sheet metal forming area, FE simulation technique to optimize forming process is widely used. To achieve high accuracy FE simulation results, identification of material properties and deformation characteristics such ad yield behaviors are very important. In this study, the yield locus of Ti-6Al-4V sheet was obtained at warm temperature. The experimental results are compared with the theoretical predictions. Also, the Forming Limit Curves (FLC) was achieved at warm temperature.
Application of FE analysis for Optimal Design of Caulking Process
박진기(Jingee Park),박준영(Junyoung Park),최석우(Seogou Choi),서성렬(Sungyoul Seo),윤덕재(Dukjae Yoon),김영석(Youngsuk Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Inner tie-rod (ITR) end assembly module is widely used in the steering systems of automobiles. The ITR module is composed of ball stud, ball seat, and socket and manufactured by caulking process. To qualify the final product of the ITR module, caulking process of the ITR module should be optimized to satisfy requirements of the ITR module such as allowable displacement, pull-out force, tilting angle and torque of the ball stud. In this paper, we investigate the deformation characteristic of both caulking and pull-out processes using FE analysis and clarify the effect of the forming parameters on allowable displacement, pull-out force and tilting angle. The FE analysis results are compared with experiments for validity of FE analysis.