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응력기반성형한계선도를 이용한 관재액압성형 부품의 성형한계 예측
허성찬(Seong-Chan Heo),김정(Jeong Kim),강범수(Beom-Soo Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In tube hydroforming process, bursting is the most frequently occured failure mode among the major failures such as wrinkling, folding, buckling, bursting and so on. Forming limit diagram(FLD) is well known as a criteria for estimation of bursting failure in almost of sheet metal forming but it is dependent on strain path while stress based diagram is independent on it. Generally, tube hydroforming consists of three processes such as pre-bending, pre-forming, and hydroforming. It means that the strain paths of hydroformed materials are nonlinear. Therefore, forming limit stress diagram(FLSD) is more suitable to predict forming limit for hydroformed parts. In this study, FLSD is applied to estimate bursting failure for an engine cradle of an automobile part. Consequently, it is proved that application of FLSD to predict forming limit is available for tube hydroforming parts.
소성불안정조건을 이용한 FLSD의 관재액압성형에의 적용
허성찬(Seong-Chan Heo),김상우(Sang-Woo Kim),김정(Jeong Kim),강범수(Beom-Soo Kang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
During the tube hydroforming processes, failures such as buckling, necking, bursting, and etc. could occur because axial feeding and internal pressure is imposed simultaneously. The purpose of this research is to establish the necking criterion for prediction of forming limit. Especially, necking is closely related with the plastic instability criterion that is frequently used in prediction of forming limit for sheet metal. In this research, it is used that FLSD(Forming Limit Stress Diagram) using the application of the diagram to prediction of the necking phenomena in the tube hydroforming processes. The results of this investigation is available to estimate the failure of the material in tube hydroforming.
허성찬(Seong-Chan Heo),김정(Jeong Kim),강범수(Beom-Soo Kang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Determination of loading conditions for tube hydroforming(THF) process that implies an amount of the increment in axial feeding and internal pressure for each step is one of the most important constituents at the process design level. On account of the fact that those design factors mentioned above are imposed simultaneously during the process, suitable loading conditions are required to obtain robust products without any failure such as buckling, necking, bursting and so on. In which, especially, bursting is well known as the most frequently occurred failure in general THF process. In this study, therefore, determination of the loading condition based on the adaptive method was carried out to obtain safe loading paths. In addition, forming limit curves are applied to evaluate the derived loading conditions by using the simulation results. Consequently, it is found that described method in this study for THF process design is useful and has a feasibility.
Design of Preform Shape in Tube Hydroforming using FEM
Woo-Jin Song(송우진),Jeong Kim(김정),Beom-Soo Kang(강범수) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Successful hydroforming processes are dependent upon a selection of proper tubular blank and a sound preform shape as well as reasonable combination of the internal pressure and the axial feeding. Therefore, it is crucial how to produce a suitable intermediate preform shape for the successful hydroforming starting from a tubular blank. This paper deals with a novel numerical approach for pre-formed shape design of hydroforming process. The proposed approach is applied to a hydroforming process of an arbitrary longitudinal product in order to be satisfied the specification required after hydroforming, and the conceptual application has been proved to be successful on its effectiveness and feasibility text here.
알루미늄 튜브 하이드로포밍에서의 예비 굽힘 공정의 효과에 관한 연구
임희택(Lim Hee Taek),박경창(Park Kyoung Chang),김형종(Kim Hyung Jong),김헌영(Kim Heon Young) 강원대학교 산업기술연구소 2004 産業技術硏究 Vol.24 No.1
Recently social demands of fuel economy and environmental regulations require the development of lightweight components and new manufacturing technologies. The aluminum tube hydroforming is a manufacturing process which can provide lightweight components as automotive parts. In this paper, the hydroformability of aluminium tube in different condition of bending process is presented. An investigation has been conducted on how to control the deformed shape and its effect on thinning distribution after hydroforming by using finite element simulation. Finite element simulation of tube hydroforming for automotive trailing arm is carried out to explore the effect of 2-dimensional and 3-dimensional bending.
알루미늄 튜브 하이드로포밍에서의 예비 굽힘 공정의 효과에 관한 연구
임희택,박경창,김형종,김헌영 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.B
Recently social demands of fuel economy and environmental regulations require the development of lightweight components and new manufacturing technologies. The aluminum tube hydroforming is a manufacturing process which can provide lightweight components as automotive parts. In this paper, the hydroformability of aluminium tube in different condition of bending process is presented. An investigation has been conducted on how to control the deformed shape and its effect on thinning distribution after hydroforming by using finite element simulation. Finite element simulation of tube hydroforming for automotive trailing arm is carried out to explore the effect of 2-dimensional and 3-dimensional bending.