• Title/Summary/Keyword: FEM Forming

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A Study on the Deep drawing drawability and Analyzing process of AZ31B Magnesium Sheet at Warm and Hot temperature (AZ31B 마그네슘 판재의 온,열간 딮드로잉 성형성 및 공정해석)

  • Han, S.H.;Choo, D.K.;Kang, C.G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.48-52
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    • 2006
  • The drawability of AZ31B magnesium sheet is estimated at various temperatures (200, 250, 300, 350 and $400^{\circ}C$), and forming speed (20, 50, 100 mm/min), thickness (0.5, 0.8, 1.0, 1.4 mm). The deep drawing process of circular cup and square cup were used in forming experiments. Experimental and FEM analysis are performed to investigate drawability and affection of controlled blank holding force. Through the controlled blank holding force, drawability was improved. This result is verified by FEM analysis. Through the observation of microstructure, the main cause is investigated as a quantity of the dynamic recrystallization.

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The Effect of Pressure-time Condition Affect in Properties of Superplastic Formed part (압력 조건이 초소성 성형품의 성질에 미치는 영향)

  • Lee, Yeong-Seon;Lee, Jeong-Hwan
    • 연구논문집
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    • s.29
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    • pp.185-194
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    • 1999
  • The shape and thickness distribution according to the pressure-time curve were carried out using the FEM and experiment. Also, mechanical properties were investigated. The square cup parts have been formed with pressure-time curve generated by result of analysis. The tensile strength and elongation have been investigated according to applied pressure conditions using the tensile test specimen obtained from the superplastic formed cup. We can use to predict the shape of formed part under the applied pressure using the FEM analysis. In the case of optimum pressure condition, the thickness distribution and mechanical properties were improved. From this study, we can find the important of optimum pressure-time condition. We have investigated about the forming of airplane part and fuel tank for motorcycle. If the applied load used in boundary conditions was appropriate, the simulation result coincides with the formed part. However, it is very difficult to define the pressure condition in complicated shape. Thus, it is need to develop the optimum pressure condition for superplastic forming.

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Finite Element Analysis for the Drawing of Square Rod from Round Bar (원형봉에서 정사각재 인발공정의 유한요소 해석)

  • Choi, Y.;Kim, H.C.;Kim, B.M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1998.03a
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    • pp.205-209
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    • 1998
  • Unlike the drawing of round section from round bar, the shaped drawing like polygonal section is known to have influence not only drawing stress but also comer filling. Therefore, this study analyze the drawing process of suqare rod from round bar using nonsteady state rigid-plastic FEM. To investigate effects of process variables of the drawing process of square rod from round bar, FE-simulations with variety of reduction in area and semi-die angle for a given frictional condition have been conduction. By this results, it has to suggest optimal process condition on the drawing stress and the comer filling. In addition, it has determined forming limit considering necking and bulging.

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A Study on the Development of Multi-pilotting-type Progressive Die for U-bending Part Process

  • Sim, Sung-Bo;Lee, Sung-Taeg;Jang, Chan-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.2
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    • pp.45-51
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    • 2003
  • The multi-piloting type progressive die for U-bending sheet metal production part is a very specific division. This study reveals the sheet metal forming process with multi-forming die by center carrier type feeding system. Through the FEM simulation by DEFORM, it was accepted to u-bending process as the first performance to design of strip process layout. The next process of die development was studied according to sequence of die development, i.e die structure, machining condition for die making, die materials, heat treatment of partially die components, know-how and so on. The feature of this study is the die development of scrapless progressive die of multi-stage through the modeling on the I-DEAS program, components drawing on the Auto-LISP, CAD/CAM application, ordinary machine tool operating and revision by tryout.

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FE Analysis of Lower Arm Hydroforming by Implicit and Explicit Method (Explicit/Implicit FEM에 의한 Lower Arm Hydroforming 공정해석)

  • Kang, Young-Ho;Kim, Jeong;Chang, You-Chul;Kang, Beom-Soo
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.783-788
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    • 2000
  • Hydroforming is a method for forming circular tubes. If this technology is to be applied economically, it is essential to have knowledge of the avoidance of failure cases as well as of the behavior of the tube in the tool under the compressive stress and forces that are exerted by the machine. A finite element simulation for manufacturing of lower arm from straight tubes, using the hydroforming method, was performed to investigate the effects of varying process parameters. Explicit method is used to simulate hydroforming in many cases, but that is not included flow rule. And then it needs simulation for implicit method. It was simulated by two methods, implicit and explicit, to compare the result of the hydroforming.

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Analysis of drawing process of the Al-Si wire using FEM (유한요소해석을 이용한 Al-Si 선재의 인발 공정해석)

  • Hwang W. H.;Kim B. M.;Kim W. Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.89-92
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    • 2004
  • This paper is concerned with the drawing process of Al-Si wire. In this study, the finite-element model established in previous work was used to analyze the effects of various forming parameters, which included the reduction in area, the semi-die angle, the aspect ratio and the inter-particle spacing of the Si in drawing processes. The finite-element results gave the consolidation condition. From the results of analysis, the effects of each forming parameter were determined. It is possible to obtain the important basic data which can be guaranteed in the fracture prevention of Al-Si wire by using FEM simulation.

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Implementation and Applications of Three Dimensional FEA System for The Forging Process (3차원 단조 해석 시스템의 개발 및 적용)

  • 박철현;이석렬;양동열;김용환;정완진;박용복;최석우;배명환;주정중
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.05a
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    • pp.145-148
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    • 2002
  • A three dimensional FEM system for supporting the design procedure of metal forming processes has been developed by integrating the FEA programs md the CAD interface modules. The system is developed to reduce the time, the extorts and the cost for establishing the successful metal forming processes for the given products. To promote practical application by engineers in medium-size enterprises who do not know much about theories of the FEA and others, various databases and intelligent interfacing modules have been developed in PC environment.

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A Study on the Forming Characteristics of Radial Extrusions (레이디얼압출의 성형특성에 관한 연구)

  • 이수형;황병복
    • Transactions of Materials Processing
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    • v.8 no.6
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    • pp.604-611
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    • 1999
  • This paper is concerned with the family of parts that generally feature a central hub with radial protrusions. As opposed to conventional forward and backward extrusion, in which the material flows in a direction parallel to that of the punch or die motion, the material flows perpendicular to the punch motion in radial extrusion. Three variants of radial extrusion of a collar or flange are investigated. Case I involves forcing a cylindrical billet against a flat die, Case II involves deformation against a stationary punch recessed in the lower die, and Case III involves both the upper and lower punches moving together toward the center of the billet. Extensive simulational work is performed with each case to see the process conditions in terms of forging load, balanced and symmetrical flow in the flange. Also, the effect of the gap size and die corner radii to the material flow are investigated. In this study, the forming characteristics of radial extrusion will be considered by comparing the forces, shapes etc. The design factors during radial extrusion are investigated by the rigid-plastic FEM simulation.

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Influences of Magnetic Field on Injection Time of Ferrite Slurry (자기장이 페라이트 슬러리의 주입시간에 미치는 영향)

  • Im, Jong-In;Yook, Young-Jin;Lee, Young-Jin
    • Journal of the Korean Ceramic Society
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    • v.43 no.12 s.295
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    • pp.829-832
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    • 2006
  • In this study, the influence of the magnetic field on ferrite slurry's injection time during the slurry forming process was investigated. The evaluation system of the slurry's injection time under the strong magnetic field was designed with FEM and manufactured. Studied parameters were the applied magnetic field, the input pressure of the slurry, and the supplying tube materials. As the results, the injection time was increased with the external magnetic field strength and rapidly decreased with increasing the input pressure of the slurry. Also the injection time was decreased when the supplying tube was manufactured with the magnetic material having the higher magnetic permeability than the ferrite.

Assessment of Hot Deformation and Grain Size Distribution in a Udimet 720Li Pancake (Udimet 720Li 합금의 고온변형 및 결정립분포 예측)

  • 염종택;나영상;박노광
    • Transactions of Materials Processing
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    • v.11 no.6
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    • pp.538-546
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    • 2002
  • Hot deformation behavior of Udiment720Li was characterized by compression tests in the temperature range of 10$25^{\circ}C$ to 115$0^{\circ}C$ and the strain rate range of $0.0005 s^{-1};to;5 s^{-1}$. The combination of dynamic material model (DMM) and Ziegler's instability criterion was applied to predict an optimum condition and unstable regions for hot forming. A dynamic recrystallization model coupled with FEM results was used to interpret the evolution of microstructures. In order to verify the reliability of the present coupled model, isothermal forging was performed in the temperature range 1050~115$0^{\circ}C$ at strain rates of $0.05 s^{-1};and;0.005 s^{-1}$. The present model was successfully applied to the hot forming process of Udimet720Li.