소성∙가공 (Transactions of Materials Processing)

  • 제20권2호
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  • Pages.104-109
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  • 2011
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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휴대폰용 금속 프론트 케이스의 프레스 성형공정에서 프레임의 형상오차 저감을 위한 연결부 형상설계

Connector Design in Press Forming Process to Prevent Frame Twisting of Metal Front Case for Mobile Phone

  • 이인규 (부산대학교 하이브리드 소재 솔루션 협동 과정) ;
  • 이찬주 (부산대학교 정밀가공시스템) ;
  • 손영기 (부산대학교 정밀가공시스템) ;
  • 이정민 (재료연구소 산업기술지원부) ;
  • 김동환 (한국국제대학교 기계자동차공학부) ;
  • 김병민 (부산대학교 기계공학부)
  • 투고 : 2010.10.15
  • 심사 : 2011.01.13
  • 발행 : 2011.04.01
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초록

The metal front case of a mobile phone is manufactured by press forming and welding of thin metal sheets. Twisting of the frame after the forming process is one of main obstacle for the assembly with reinforcement by welding. This study introduces a method preventing twisting of the metal front case frame in press forming. The spring-back after forming produces twisting of the frame, which leads to a low structural stiffness. To reduce twisting, connectors are required to reinforce the structural stiffness of the frame. In this study, the twisting profile is evaluated using a finite element(FE) analysis for various connector shapes. The actual connector shape is determined by minimization of the frame twisting within the tolerance of the FE-analysis. To verify the validity of the proposed blank shape, a forming experiment is performed and the twisting profile is measured using a 3D laser scanning method. The dimensional accuracy is found to be within the tolerance and in good agreement with the FE-analysis.

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참고문헌

  1. G. H. Kim, D. C. Ko, K. K. Kam, B. M. Kim, 2009 The Design of Forming Process of Joint Guide for Battery Cover of Mobile Phone, Proc. Kor. Soc. Precision Eng. Conf., pp. 283-284.
  2. B. K. Ha, T. W. Ku, B. S. Kang, 2000, Blank Design of The High Miniature Rectangular Vibrator Case for The Cellular Phone, Trans. Kor. Soc. Mech. Eng., pp.754-758.
  3. K. H. Kim, H. S. Kwon, 1996, Study on the Deformation of a Sheet Metal Structure due to Stamping Residual Stress, Proc. Kor. Soc. Tech. Plast. Conf., pp. 48-71.
  4. U. Masanobu, U. Keii, K. Masaru, 1981, A Study of Springback in The Stretch Bending of Channels, J. Mech. Working Technol., Vol. 5, pp. 163-179. https://doi.org/10.1016/0378-3804(81)90038-3
  5. S. K. Panthi, N. Ramakrishnan b, Meraj Ahmed, Shambhavi S. Singh, M.D. Goel, 2010, Finite Element Analysis of sheet metal bending process to predict the springback, Mater. Design, Vol. 31, pp. 657-662. https://doi.org/10.1016/j.matdes.2009.08.022
  6. DYNAFORM User’s Manual, Ver. 5.5
  7. D. C. Ko, S. H. Cha, S. K. Lee, C. J. Lee, B. M. Kim, 2010, Application of a feasible formability diagram for the effective design in stamping processes of automotive panels, Mater. Design, Vol. 31, pp.1262-1275. https://doi.org/10.1016/j.matdes.2009.09.022