Browse > Article
http://dx.doi.org/10.5228/KSTP.2011.20.2.104

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

Lee, I.K. (부산대학교 하이브리드 소재 솔루션 협동 과정)
Lee, C.J. (부산대학교 정밀가공시스템)
Son, Y.K. (부산대학교 정밀가공시스템)
Lee, J.M. (재료연구소 산업기술지원부)
Kim, D.H. (한국국제대학교 기계자동차공학부)
Kim, B.M. (부산대학교 기계공학부)
Publication Information
Transactions of Materials Processing / v.20, no.2, 2011 , pp. 104-109 More about this Journal
Abstract
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.
Keywords
Metal Front Case; In-plane Bending; Structural Stiffness; Frame Twisting; Connector Design;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 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.
2 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.
3 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.   DOI
4 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.   DOI
5 DYNAFORM User’s Manual, Ver. 5.5
6 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.   DOI
7 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.