• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2009.10a
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• pp.71-71
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• 2009

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1998.10a
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• pp.17-17
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• 1998

1970년대에 개발된 Ti-15-3 합금은 상온에서 우수한 성형성을 가지고 있어 Ti-6-4 합금보다 성형 공정을 대폭 감소시킬 수 있어 생산비용을 크게 감소시킬 수 있는 장점이 있는 합금이다. 또한, 냉간 성형성이 우수하고 강화 범위가 폭넓기 때문에 항공기의 프레임, 항공기 압력 용기 및 고장력 유압 튜브 등에 많이 사용하고 있으나, 열간 성형성이 Ti-6-4 티타늄 합금보다 좋지 않기 때문에 이제까지의 적용 분야는 판재 성형 등의 한정된 분야에만 적용되어 오고 있는 실정이다.

• Journal of the Korean Society of Propulsion Engineers
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• v.4 no.3
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• pp.55-63
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• 2000

Studies for tube spin forming have been implemented restrictively compared to spinning process, because of the complex of deformation mechanism. Especially there were not many studies by using FEM(Finite Element Method) for overcoming restriction of upper bound method. In this paper, the tube spinning process is analyzed to produce cylindrical body made by titanium alloy. In analysis, processing parameters was obtained by using upper bound method to consider material properties of titanium alloy and finite element analysis was implemented to investigate the flatness and the elongation of the titanium alloy workpiece by using ABAQUS code. The independent variables are ; material properties of workpiece, angles of roller, reduction of diameter. Three variables, two angles of roller and reduction of diameter are optimized by using the upper bound method. In this method, we can estimate the workable power, working force and reduction of diameter, and also the flatness and the elongation of workpiece by the finite elements analysis using ABAQUS/standard. The results indicates that these variables play a critical factors of spinning process for the titanium alloy and the optimum values of these variables.

• Transactions of Materials Processing
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• v.19 no.1
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• pp.50-58
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• 2010

In order to successfully implement hot die forging process for the large-size titanium alloy products, it is necessary to devise a customized heating method for the billets and the die tools, as well as the die tool design. This study aims at establishing a hot die forging process of the large-size titanium alloy container products by applying the warm die, semi-hot die and hot die forging process step-wise. To accomplish this purpose, forging mechanism and the die tools were designed considering the strength of die materials at the given die heating temperature. The movable heating devices for the billet and the die tools were also introduced to prevent overcooling of billet and die tools. To verify the applicability of the designed forging process, real-size forging tests were carried out and the quality of forged products, including dimension, surface condition, microstructure and the mechanical properties was evaluated.