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http://dx.doi.org/10.5762/KAIS.2015.16.6.3692

Design of Cold Forging Process of Micro Screw for Mobile Devices  

Choi, Du-Soon (Department of Mechanical Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.16, no.6, 2015 , pp. 3692-3697 More about this Journal
Abstract
A screw is a type of fastener characterized by a helical ridge known as thread. The demands for screws with the miniaturization and weight reduction are increasing for the trend of small size of mobile devices. The successful designs of mold and process are very important to obtain screws with good mechanical properties and high precision. In this study, the design of cold forging process of micro screw was carried out by using finite element method. In particular, in order to investigate the effects of die geometries and friction, design of experiment method was adopted and it was revealed that the friction was the dominant factor of folding defects. From these results, the design of die was modified and experiments were carried out with the modified die. From the experimental results, it was found that the folding defects disappeared.
Keywords
Cold Forging; Die Design; Finite Element Method; Micro Screw;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 K. B. Min, J. B. Kim, K. Park, and S. W. Ra, "Evaluation of Clamping Characteristics for Subminiature Screws According to Thread Angle Variation," Journal of the Korean Society for Precision Engineering, Vol. 31, No. 9, pp. 839-846, 2014. DOI: http://dx.doi.org/10.7736/KSPE.2014.31.9.839   DOI
2 H. C. Lee, M. A. Saroosh, Y. T. Im, H. S. Kim, I. H. Son, and D. L. Lee, "Two-dimensional finite element approximation of the hexagonal bolt forming process," Journal of Materials Processing Technology, Vol. 201, pp. 19-24, 2008. DOI: http://dx.doi.org/10.1016/j.jmatprotec.2007.11.168   DOI
3 H. C. Lee, Y. G. Jin, Y. H. Lee, I. H. Son, D. L. Lee, and Y. T. Im, "Process design of high-strength bolt of fully pearlitic high-carbon steel," Journal of Materials Processing Technology, Vol. 210, pp. 1870-1875, 2010. DOI: http://dx.doi.org/10.1016/j.jmatprotec.2010.06.017   DOI
4 J. Kim, S. W. Chae, S. S. Han, and Y. Son, "Manufacturing Process Design of Aluminum Alloy Bolt," Journal of the Korean Society for Precision Engineering, Vol. 27, No. 5, pp. 63-68, 2010.
5 W. S. Seo, B. W. Min, K. Park, S. W. Ra, S. H. Lee, J. H. Kim, and J. B. Kim, "Design of Cold Heading Process of a Screw for Storage Parts," Transactions of Materials Processing, Vol. 20, No. 1, pp. 48-53, 2011. DOI: http://dx.doi.org/10.5228/KSTP.2011.20.1.48   DOI
6 S. W. Ra, I. R. Kim, and S. T. Hwang, "Study of Production and Material Properties of Micro Screw Using SWCH18A and SUS XM7 Materials," Transactions of the Korean Society of Mechanical Engineers A, Vol. 38, No. 9, pp. 1043-1048, 2014. DOI: http://dx.doi.org/10.3795/KSME-A.2014.38.9.1043   DOI