• Title, Summary, Keyword: Hydroforming

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A Study on the Weld Line Position Optimization for Hydroforming (Hydroforming을 위한 Weld line 최적배치에 관한연구)

  • 전병희
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.9 no.3
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    • pp.160-168
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    • 2000
  • Hydroforming is a metal forming process that enables circular metal tubes to be formed in to the parts with the complex cross section along the curved axial direction. Recently this hydroforming process is largely used for the production of the automotive parts. This paper presents the results of tube bending and hydroforming simulations in cases of the varying weld line positions of the tube. Ten cases of prebending and hydroforming simulations are carried out to find the optiaml weld line position.

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Trends and Automotive Applications of Hydroforming (하이드로포밍 부품 적용 및 기술 개발 현황)

  • 서만석;김덕환
    • Transactions of Materials Processing
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    • v.11 no.4
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    • pp.295-301
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    • 2002
  • Recently, design concepts of vehicle will have to consider the safty and economy of fuel consumtion. The hydroforming technology has applied to increase strength, and to decrease weight, cost and part count. The hydroforming has been recognized as general technique in automotive industry. This paper deals with the trends of automotive application of hydroforming, new hydroforming technologies, facilities.

Analysis of Hydroforming Process for an Automobile Lower Arm by FEM (유한요소법을 이용한 자동차 로어암의 액압성형 해석)

  • Kim, J.;Chang, Y.C.;Kang, S.J.;Kang, B.S.
    • Transactions of Materials Processing
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    • v.10 no.7
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    • pp.534-542
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    • 2001
  • Tubular hydroforming has attracted increased attention in the automotive industry recently. In this study, a professional finite element program for analysis and design of tube hydroforming processes, has been developed, called HydroFORM-3D, which is based on a rigid-plastic model. With the developed program HydroFORM-3D, the hydroforming process for an automobile lower arm is analyzed and designed. The manufacturing process for a lower arm consists of tube bending, preforming, and final hydroforming. To accomplish successful hydroforming process design, thorough investigation on proper combination of process parameters such as internal hydraulic pressure, axial feeding, and tool geometry is required. This paper describes the influences of forming conditions on the hydroforming of a lower arm by using simulation to predict strain and tube shape during bending, preforming, and final hydroforming processes.

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Analysis and formability evaluation in tube and welded blank hydroforming of engine mount bracket (엔진마운트 브래킷의 튜브 및 용접판매 유압성형에 대한 성형해석과 성형성 비교)

  • 신용승
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.7-13
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    • 1999
  • Hydroforming is the technology that utilizes hydraulic pressure to form sheet and tube metals in to desired shapes inside die cavities. It can be subdivided into tube hydroforming and sheet hydroforming according to the blanks used. In this paper the simulation of tube and welded blank hydroforming is carried out respectiyely. And simulation results are compared to evaluate formability in tube and welded blank hydroforming of engine mount bracket

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Pre-Bending Analysis of Tie-Bar for Hydroforming (Hydroforming을 위한 Tie-bar의 예비굽힘성형 해석)

  • 강대철;전병희;성부용
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.255-261
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    • 2000
  • Tube bending is one of the conventional manufacturing process. Recently, tube bending was highlighted in automotive industry by hydroforming. Tube hydroforming process is divided into pre-bending process and hydroforming process. It's initial state is very important in die cavity of first hydroforming process. So tube bending is important factor of the hydroforming process. In this paper, two pre-bending simulations, by a rotary draw bending machine and a bend die. This paper presents the simulation results in pre-bending process that is used to form an automotive part, tie-bar.

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Analysis of Hydroforming Process and Forming Limit Prediction by FEM (유한요소법을 적용한 하이드로포밍 공정 해석 및 성형한계 예측)

  • Kim J.;Kang S. J.;Kang B. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.36-39
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    • 2001
  • Tubular hydroforming has attracted increased attention in the automotive industry recently. In this study, a professional finite element program for analysis and design of tube hydroforming processes has been developed, called HydroFORM-3D, which is based on a rigid-plastic model. With the developed program several hydroforming processes such as a tee extrusion, an automotive rear axle housing and lower arm are analyzed and designed. And also, the Oyane's ductile fracture integral I was calculated from the histories of stress and strain according to every element and then the forming limit of the hydroforming process could be evaluated. The pediction of the bursting failure and the plastic deformation during typical hydroforming processes shows to be reasonable so that this approach can be extended to other various tube hydroforming processes.

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Finite Element Analysis for the Hydroforming Process of Sheet Metal Pairs (박판쌍 하이드로포밍 공정의 유한요소해석)

  • Kim J.;Chang Y. C.;Ok C. S.;Kang B. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.40-43
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    • 2001
  • The use ef sheet material for the hydroforming of a closed hollow body out of two sheet metal blanks is a new class of hydroforming process. By using a three-dimensional finite element program, called HydroFORM-3D, the hydroforming process of sheet metal pairs is analyzed. Also the comparison of conventional deep-drawing and hydroforming process was conducted. The simulation has concentrated on the influences of the various forming conditions, such as the unwelded or welded sheet metal pairs and friction condition, on the hydroforming process. This computational approach can prevent time-consuming trial-and-error in designing the expensive die sets and hydroforming process of sheet metal pairs.

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Forming Analysis on the Tubular Hydroforming of Side Member (Side Member 관재 하이드로포밍 성형해석)

  • Park J. H.;Choi Y. C.;Oh Y. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.54-58
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    • 2001
  • In recent years, hydroforming technology has been one of the most important technology in automotive industry in the points of weight saving, cost reduction and qualify improvement. However, compared with traditional metal forming technology, hydroforming has much fewer information in experience and empirical knowledge. But we don't have my sufficient time and money to produce hydroforming products using real blank directly Therefore Simulation is essential in hydrofonrung technology development. In this paper, we simulate the side member as the tubular hydroforming technology. The manufacturing process of side member' consists of pre_bending, pre_forming, and hydroforming of a thin tube. Variables such as internal pressure, end feeding, and tool geometry are optimized to improve the forming safety. And we simulate side member according to several lubricant conditions. from those simulations, we find that strain distributions can be reduced well by internal pressure and end feeding control, and lubrication is the most important thing in hydroforming process.

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Numerical and Experimental Analysis of Hydroforming Process of Sheet Metal Pairs (박판페어를 이용한 하이드로포밍 공정의 수치적 및 실험적 해석)

  • Kim T. J.;Yang D. Y.;Han S. S.;Nam J. B.;Jin Y. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.50-53
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    • 2001
  • Hydroforming process has become an effective manufacturing process because it can be adaptable to forming of complex structural components. Tube hydroforming has been successfully developed in the real industrial field by many researchers. However, there still remains the constraint about shape which can be manufactured by tube hydroforming. In order to improve this constraint of shape and formability of conventional sheet metal forming, hydroforming process of sheet metal pairs becomes an important technology. In the present work, the finite element analysis of hydroforming process of sheet metal pairs is presented. After basic study about experimental parameters based on numerical analysis, hydroforming process of sheet metal pairs is developed which uses hydraulic pressure as a main forming source.

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Effect of Process Parameters on Hydroforming (Hydroforming 공정변수의 영향)

  • 권재욱;명노훈;이경돈
    • Transactions of Materials Processing
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    • v.9 no.6
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    • pp.615-623
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    • 2000
  • The industrial application of hydroforming has a great potential in saying cost and achieving dimensional accuracy in automotive industry presently. The aim of the following article is to investigate the effect of process parameters on hydroformed part. Firstly, we have to investigate the change of mechanical properties for sheet and pipe material according to various radius/thickness ratio(r/t). The change of mechanical properties affects the yield stress more than the total elongation. Increase of yield stress for pipe has a bad influence on formability of hydroforming. Among the roll-forming process, the sizing process didn't change mechanical properties. The process parameters such as the initial pressure, mandrel shape and friction have seriously influenced on formability of hydroforming. Therefore we need to check formability of given material through the FE analysis in the beginning stage of process design and the predicted hydroforming process parameters ate generally a good starting point for the prototype tryout stage. The results of pretending, hydroforming analysis using FE model are good agreement with experimental results.

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