Two-step electromagnetic forming process using spiral forming coils to deform sheet metal in a middle-block die

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• 作者：Hak-Gon Noh (1)
  Woo-Jin Song (2)
  Beom-Soo Kang (3)
  Jeong Kim (1)
  
  1. Department of Aerospace Engineering ; Pusan National University ; Gumjung-ku ; Busan ; 609-735 ; South Korea
  2. Industrial Liaison Innovation Center ; Pusan National University ; Gumjung-gu ; Busan ; 609-735 ; South Korea
  3. ERC/ITAF ; Pusan National University ; Gumjung-ku ; Busan ; 609-735 ; South Korea
  
• 关键词：Electromagnetic forming ; Lorentz force ; Bouncing effect ; LS ; DYNA EM ; Forming coil
• 刊名：The International Journal of Advanced Manufacturing Technology
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：76
• 期：9-12
• 页码：1691-1703
• 全文大小：5,082 KB
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  3. Balanethiram VS, Xiaoyu H, Altynova M, Daehn GS (1994) Hyperplasticity: enhanced formability at high rates. J Mater Process Technol 45:595鈥?00 CrossRef
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  6. Imbert J, Worswick M, Winkler S, Golovashchenko S, Dmitriev V (2005) Analysis of the increased formability of aluminum alloy sheet formed using electromagnetic forming, SAE World Congress, Paper 2005-01-0082. SAE International, Detroit, Michigan, USA CrossRef
  7. Imbert JM, Winkler SL, Worswick MJ, Oliveira DA, Golovashchenko S (2005) The effect of tool-sheet interaction on damage evolution in electromagnetic forming of aluminum alloy sheet. J Eng Mater Technol Trans ASME 127:145鈥?53 CrossRef
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  11. Bahmani MA, Niayesh K, Karimi A (2009) 3D simulation of mantic field distribution on electromagnetic forming systems with field-shaper. J Mater Process Technol 209:707鈥?13 CrossRef
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  14. Srinivasan S, Wang H, Taber G A, Daehn G S (2010) Dimensional control and formability in impact forming, 4th International Conference on High Speed Forming, pp. 249鈥?58
  15. Noh HG, Song WJ, Kang BS, Kim J (2014) 3-D numerical analysis and design of electro-magnetic forming process with middle block Die. Int J Precis Eng Manuf 14(5):855鈥?65 CrossRef
  16. Demir OK, Phyk V, Tekkaya AE (2010) Simulation of tube wrinkling in electromagnetic compression. Prod Eng 4(4):421鈥?26 CrossRef
  17. ASTM (2002) Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductor, ASTM B285-08
  
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Production and Logistics
  Mechanical Engineering
  Computer-Aided Engineering and Design
  
• 出版者：Springer London
• ISSN：1433-3015

文摘

Two-step electromagnetic forming (EMF) of a metal sheet into the shape of a middle block is proposed in this paper. EMF is a high-speed forming process involving the application of a Lorentz force to the workpiece. The high speed of the forming process produces bouncing of the workpiece, which may result in poor shape accuracy owing to the absence of a medium between the coil and the workpiece. The proposed two-step EMF was used to solve this problem. In the demonstration of the proposed method, a 3D numerical simulation of the current supplied through the forming coil was performed using an LS-DYNA electromagnetism module, and the results were used to select a spiral forming coil with a 50-mm dead zone for the first step of deforming the workpiece. The process did not adequately achieve the desired shape, and, based on the results of another simulation, a second forming coil with a 20-mm dead zone was used for the second forming step of completing the fit with the forming die. The experimental results showed that the accuracy in shape achieved by the proposed multistep forming process was better than that of the single-step process, especially regarding the reduced wrinkling and sharpness of the edge of the workpiece.