• 제목/요약/키워드: Conical-Shaped Die

검색결과 4건 처리시간 0.02초

전자기 성형시 금형과 소재의 접촉에 따른 성형성 개선 예측 (Prediction of the Formability Enhancement from Electromagnetic Forming due to Interaction between Tool and Blank Sheet)

  • 이연희;김홍교;노학곤;안우진;김정
    • 소성∙가공
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    • 제24권3호
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    • pp.199-204
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    • 2015
  • Electromagnetic Forming is a high speed forming technology which uses electromagnetic (Lorentz’s) forces to shape sheet metal parts. In the current study the effect of the tool-sheet interaction during electromagnetic forming on formability enhancement is investigated using FEM. The decrease in void volume fraction by having the sheet contact with die helps to improve formability. The main purpose of the current study was to predict improvement of formed sheets whether the sheet contacts or does not contact the die under experimental conditions and 3-D finite element analysis. The results show that fractures caused by the voids in the forming sheet appear only in some specific cases and the bulge height of the conical shape was shorter than the height with a free bulge. For the same height conditions, however, the formability was improved for the conical-shaped die when there is sheet contact with the die.

강소성 유한요소법과 신경망을 이용한 직사각재 인발공정에 관한 연구 (A Studyon the Drawing of Rectangular Rod from Round Bar by using Rigid Plastic FEM and Neural Network)

  • 김용철;최영;김병민;최재찬
    • 소성∙가공
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    • 제8권4호
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    • pp.331-339
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    • 1999
  • In this study, to analyze the shaped drawing process from round bar, the practical conical die with considering die radius and bearing was defined by a mathematical expression, and also a simple technique for initial mesh generation to the shaped drawing process was proposed. The drawing of rectangular section from round bar, one of the shaped drawing process, has been simulated by using non-steady state 3D rigid plastic finite element method in order to evaluate the influence of semi-die angle and reduction in area to corner filling. Other process variables such as friction constant, rectangular ratio, die radius and bearing length were fixed during the simulation. An artificial neural network has been introduced to obtain the optimal process conditions which gave rise to a fast simulation.

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강소성 유한요소법 을 이용한 축대칭 전방 압출 해석 (Rigid-Plastic Finite Element Analysis of Axisymmetric Forward Extrusion)

  • 양동열;오병수;이중홍
    • 대한기계학회논문집
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    • 제9권4호
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    • pp.452-462
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    • 1985
  • 본 논문에서는 금형의 형상과 단면 감소율등이 이에 미치는 영향을 조사하였 다. 이론과의 비교를 위해서 풀림처리된 특수강 소재인 SCM4로 실험을 행하였다. 압출하중은 로드셀(loadcell)로 측정하였으며 수치계산에서 구해진 속도장과 실제속도 장의 차이를 살펴보기 위해서 시편단면에 포토에칭(photoetching)한 압출시킬 시편의 그리드변형을 강소성유한요소법으로 계산한 그리드패턴과 비교 검토하였다.

금속복합재료의 열간압출에 관한 금형설계의 최적화기법(I) (Optimization Techniques of Die Disign on Hot Extrusion Process of Metal Matrix Composites)

  • 강충길;김남환;김병민
    • 소성∙가공
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    • 제6권4호
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    • pp.346-356
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    • 1997
  • The fiber orientation distribution and interface bonding in hot extrusion process have an effect on the maechanical properties of metal matrix composites(MMC's). Aluminium alloy matrix composites reinforced with alumina short fibers are fabricated by compocasting method. MMC's billets are extruded at high temperature through conical and curved shaped dies with various extrusion ratios and temperature. This present study was directed to describe the systematic correlation between extrusion die shape and subsequent results such as fiber breakage, fiber orientation and tensile strength to hot extruded MMC's billet. Extrusion load, tensile strength and hardness for variation of extrusion ratios and temperature are investigated to examine mechanical properties of extruded MMC's SEM fractographs of tensile specimens are observed to analyze the fracture mechanism.

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