• Title, Summary, Keyword: 튜브 하이드로포밍

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Preliminary Study on Optimization of the Tube Hydroforming Process Using the Equivalent Static Loads (등가정하중을 이용한 튜브 하이드로포밍 공정 최적설계에 관한 기초연구)

  • Jang, Hwan-Hak;Park, Gyung-Jin;Kim, Tai-Kyung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.3
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    • pp.259-268
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    • 2015
  • An optimization method for the tube hydroforming process is developed using the equivalent static loads method for non linear static response structural optimization (ESLSO). The aims of the tube hydroforming optimization are to determine the axial forces (axial feedings) and the internal pressures, and to obtain the desired shape without failures after hydroforming analysis. Therefore, the magnitude of the forces should be design variables in the optimization process. Also, some tube hydroforming optimization needs to consider the result of the thickness in nonlinear dynamic analysis as responses. However, the external forces are considered as constants and the thickness is not a response in the linear response optimization process of the original ESLSO. Thus, a new ESLSO process is proposed to overcome the difficulties and some examples are solved to validate the proposed method.

Forming Analysis and Formability Evaluation for Aluminum Tube Hydroforming (알루미늄 튜브 하이드로포밍 성형 해석 및 성형성 평가)

  • Lim H. T.;Kim H. Y.;Kim H. J.;Lee D. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.243-246
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    • 2005
  • A tube hydroformability testing system was designed and manufactured to observe the forming steps and to provide arbitrary combination of internal pressure and axial feed. The forming limit diagram of an aluminum tube was obtained from the free bulge test and the T-shape forming test using this system, giving the criteria for predicting failure in the hydroforming process. The hydroformability of aluminum tube according to different conditions of a prebending process was discussed, based on the finite element analysis and the forming limit test. The effects of 2D and 3D prebending on the tube hydroforming process of an automotive failing arm were evaluated and compared with each other.

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Analysis of Tube Expansion by Hydroforming (하이드로포밍에 의한 튜브 확관에 대한 해석)

  • Lee, Jae-Won;Park, Jong-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.11
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    • pp.2253-2261
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    • 2002
  • Recently the hydroforming technology has drawn a lot of attention because of its capability to produce high quality and light weight parts. In the present study, the tube expansion - one of the simplest hydroforming processes, has been investigated in order to understand fundamental phenomena such as deformation characteristics and effect of process parameters. As a result, the most important process parameters, which determine the state of stress at the expanded zone, were found to be pressure and die displacement. If the stress becomes equi-axial tension at the zone, necking occurs at some distance from the weld line and develops into a crack along the axial direction. Some aspects of mechanical property measurements as well as distributions of hardness and microstructure are also discussed in this paper.

Analysis on Roll Over in the Tube Hydro-Piercing Process (튜브 하이드로 피어싱시 롤 오버의 실험적 분석)

  • Choi, Sung-Ki;Ahn, Ick-Tae;Moon, Young-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.7
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    • pp.992-998
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    • 2004
  • During the tube hydropiercing, the region adjacent to the pierced hole will be deformed and will be drawn away from the die block as the punch advances through the wall of the tube. The deformation in the region may range from a substantially flat form to a countersunk form, so called rollover. In this study, the effects of material properties, shape of piercing punches, roundness of tube surface and internal pressure within the tube during piercing on the rollover have been investigated experimentally. The results provide the quantitative variation of rollover at given hydropiercing parameters, and a relationship between the deformed radius and the rollover caused by the deformation has been established.

Loading Path Optimization in Aluminum Tube Hydroforming using Response Surface Method (반응표면법을 이용한 알루미늄 튜브 하이드로포밍의 하중경로 최적화)

  • Lim, H.T.;Kim, H.J.;Kim, H.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.314-317
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    • 2007
  • Automotive rear subframe of aluminum tube was developed by using hydroforming process, based on the numerical analysis and physical tryouts. In the previous study, the effect of prebending was evaluated on the basis of forming limit diagram which had been obtained from free bulging, T-shape forming and cross-shape forming, using the developed tube hydroformability testing system. In order to get the sound products, appropriate internal pressure is to be imposed corresponding to the axial feeding. In this study, the loading path, the combination of internal pressure and axial feeding during the process, was optimized to ensure minimum thickness variation and dimensional accuracy, by using response surface method.

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Comparison of Energy Consumptions for Various Forming Processes (성형 가공 차이에 의한 에너지 소비량 비교)

  • Yin, Z.H.;Zhang, Y.J.;Chae, M.S.;Park, B.C.;Kim, Y.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.333-336
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    • 2008
  • There are many different kinds of forming processes to make a tubular product such as hydroforming and tube drawing. However, we should consider a better forming process in view point of energy consumption and $CO_2$ emission to save our earth. In this paper we have conducted FEM simulations to the various forming processes for sheet and tubular products to compare their energy consumptions. One example is tubular product and the other for drawn cup. From the comparisons of total energy for hydrofroming and tube sinking processes, hydroforming is consumed more energy than tube drawing. Also the cup drawing from sheet metal and tube sinking for the cup with flange indicate that the tube sinking is better than cup drawing of sheet metal in energy consumption.

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Hydroforming Process Design of High-Strength Steel Tube (고장력강 관재 액압성형 공정 설계)

  • Kim, K.J.;Kim, H.Y.;Ko, H.G.;Shin, M.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.202-205
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    • 2009
  • Tubular torsion beam of high strength steel is going about in an automotive rear axle due to the advantages of light weight and efficient rear packaging capability. High strength tubular beam can be manufactured by the hydroforming in order to ensure dimensional accuracy, while a conventional stamping has been used for steel tubular beam. Internal pressure, feeding and their combination are the key factors of controlling the process. Based on the numerical simulation and try-outs, the optimized hydroforming process conditions for the high strength tubular beam were suggested.

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