• 제목/요약/키워드: LS-DYNA EM-Module

검색결과 2건 처리시간 0.018초

전자기력 자유벌지 실험을 위한 성형코일 설계 및 3-D 해석비교 (Design of a Free Bulge Test Coil Using Electromagnetic Forces and Comparison between Experimental and Numerical Results)

  • 김홍교;노학곤;강범수;김정
    • 소성∙가공
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    • 제23권7호
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    • pp.431-438
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    • 2014
  • For electromagnetic forming(EMF) the most important feature is a forming coil which creates the electromagnetic force(Lorentz force), using current density and a magnetic field. Most previous papers have concentrated on the final configuration of the blank or the efficiency of EMF process. Studies focused on the design parameters affected by the forming coil performance have not been conducted. In order to design a suitable forming coil for an object, the current study uses LS-DYNA EM-Module to not only optimize the coil but also to examine the effect of coil performance. By this method a suitable forming coil was made and tested to determine whether or not good formability was achieved in a free bulge test Numerical analysis was also used. The workpiece was Al 1100-O with a thickness of 1.27mm and the coil was made from copper CW004A, which has good electrical conductivity and is suitable for electrical components.

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.