• Title/Summary/Keyword: Half Die Angle

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Effect of Die Angle in the Hydrostatic Extrusion of Copper-clad Aluminium Composites (Copper-clad Aluminium 복합재료의 정수압 압출시 다이 각이 미치는 효과)

  • 한운용;박훈재;윤덕재;정하국;김승수;김응주;이경엽
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.414-417
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    • 2003
  • A copper-clad aluminium composite bar is lighter and less expressive than a commercial copper alloy bar. Copper-clad aluminium composite bar can be fabricated by hot hydrostatic extrusion process. In this work, the effect of die angle on the compressive properties of copper-clad aluminium composites fabricated using hydrostatic extrusion process was investigated experimentally. The results showed that optimum half die angle was in the range of 40$^{\circ}$ to 50$^{\circ}$ for an extrusion ratio of 19. The results also showed that the half die angle had little influence on the compressive strength of copper-clad aluminium composites. A diffusion layer increased with increasing die angle.

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The Characteristic of a Hydrostatic Extrusion of Magnesium Alloy(AZ31) (Mg 합금(AZ31)의 열간 정수압 압출 특성에 관한 연구(I))

  • Yoon D. J.;Seo Y. W.;Jeong H. G.;Na K. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.128-131
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    • 2004
  • Magnesium alloys are being extensively used in weight-saving applications and as a potential replacement for plastics in electronic and computer applications. Magnesium alloy has some good characteristics, EMI shielding property and high specific strength. Nevertheless their high brittleness make it uneasy to process the magnesium. Magnesium alloys are extruded like aluminium alloys. The present work was done to find a characteristic of magnesium alloy(AZ31) changing the extrusion ratio 8.5, 19.1, 49 respectly and changing the die half angle $30^{\circ},\;45^{\circ},\;60^{\circ}$. Here this present done by the hydrostatic extrusion in the hot condition, $310^{\circ}$. The higher the extrusion ratio goes, the higher the extrusion force goes.

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The Characteristic of a Hydrostatic Extrusion of Magnesium Alloy(AZ31) - II (Mg 합금(AZ31)의 열간 정수압 압출 특성에 관한 연구(II))

  • Seo Y. W.;Jeong H. G.;Na K. H.;Yoon D. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.05a
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    • pp.144-147
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    • 2005
  • In hydrostatic extrusion the billet in the container is extruded through a die with a liquid acting as a pressure medium, instead of by the direct application of the load by a ram. And the extrusion pressure can be affected by the flow stress and they are affected by the temperature. So in this study the temperature is the main issue with a extrusion ratio and a half die angle. As extrusion temperature goes down from $300^{\circ}C$ to $200^{\circ}C$, tensile strength goes up to 310MPa. Because velocity of extrusion is higher than the conventional extrusion, there is another characteristic in the sense of microstrure. The temperature was sotted to $300^{\circ}C,\;250^{\circ}C,\;200^{\circ}C$, respectively. There is a increase of extrusion pressure abot $15\%$.

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Optimization of Die Design for Tube Cold Extrusion using Taguchi Method (다구치 방법을 이용한 튜브 냉간 압출 금형의 최적화)

  • Lim, S.S.;Lim, S.J.;Choi, H.J.;Cho, C.D.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.153-158
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    • 2006
  • Nowadays, hollow upper-shaft of monobloc type has been considered for weight reduction and high quality in the automobile industry. To form the upper-shaft under tube cold extrusion, Taguchi method is applied to optimize the die design in this study. Taguchi method for optimum die design is to establish the optimal combination of design parameters and to reduce a number of experiments. Effect of parameters including the die relief, mandrel, die half angle is investigated and analyzed based on FEA analysis using a FEM commercial software MSC_Marc. Furthermore extrusion experiments have been performed to verify the results investigated in the FEM simulations.

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Characteristics of Extruded Mg alloy(AZ31) for various annealing temperatures (정수압 압출 소재의 열처리 조건에 따른 마그네슘합금(AZ31)의 특성 변화)

  • Seo Y. W.;Choi H. J.;Yoon D. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.10a
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    • pp.463-466
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    • 2005
  • Restoring ductility or removing residual stresses is a necessary operation when a large amount of cold working is to be performed, such as in a cold-forging or warm forging process. The advantage of annealing temperatures was investigated. After Hydrostatic Extrusion process, extruded materials were annealed at $200^{\circ}C,\;350^{\circ}C,\;450^{\circ}C$ for 1 hour. Microstructure of the annealed material was observed to make an understand about the difference in mechanical properties.

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Process Map for Improving the Dimensional Accuracy in the Multi-Stage Drawing Process of Rectangular Bar with Various Aspect Ratio (다양한 종횡비의 직사각바 다단 인발공정에서 치수정도 향상을 위한 프로세스 맵)

  • Ko, P.S.;Kim, J.H.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.27 no.3
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    • pp.154-159
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    • 2018
  • In the rectangular bar multi-stage drawing process, the cross-section dimensional accuracy of the rectangular bar varies depending on the aspect ratio and process conditions. It is very important to predict the dimensional error of the cross-section occurring in the multi-stage drawing process according to the aspect ratio of the rectangular bar and the half die angle of each pass. In this study, a process map for improving the dimensional accuracy according to the aspect ratio was derived in the drawing process of a rectangular bar. FE-simulation of the multi-stage shape drawing process was carried out with four types of rectangular bar. The results of the FE-simulation were trained to the nonlinear relationship between the shape parameters using an Artificial Neural Network (ANN), and the process maps were derived from them. The optimum half die angles were determined from the process maps on the dimensional accuracy. The validity of the suggested process map for aspect ratios 1.25~2:1 were verified through FE-simulation and experimentation.