Browse > Article
http://dx.doi.org/10.5228/KSTP.2011.20.1.48

Design of Cold Heading Process of a Screw for Storage Parts  

Seo, W.S. (서울과학기술대학교 NID 융합대학원)
Min, B.W. (서울과학기술대학교 NID 융합대학원)
Park, K. (서울과학기술대학교 기계설계자동화공학부)
Ra, S.W. ((주) 서울금속 기술연구소)
Lee, S.H. (서울과학기술대학교 자동차공학과)
Kim, J.H. (서울과학기술대학교 제품설계금형공학과)
Kim, J.B. (서울과학기술대학교 자동차공학과)
Publication Information
Transactions of Materials Processing / v.20, no.1, 2011 , pp. 48-53 More about this Journal
Abstract
Fasteners are used to join the various electronic products and machines. So, the quality and reliability of the fastener are strongly requested. In this study, the analyses of the multi-stage cold forging of TORX screws for storage parts are carried out. In manufacturing of TORX screws, crack and folding defects are observed. Therefore, the analysis is focused on the prediction of the defects. Based on the analysis results, the upper die and process conditions are redesigned to reduce the defects. The upper die shape for preform forming is redesigned to prevent folding and sharp shape change. The Cockroft-Latham damage criterion is introduced to predict the crack initiation. Analysis results shows that the maximum Cockroft-Latham damage value is decreased by 40% in the forming using the modified upper die.
Keywords
Cold Forging; Screw; Fasteners; Heading; Damage; Crack; Multi-stage Forging;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 J. Chen, B. Young, 2006, Stress-strain curves for stainless steel at elevated temperatures, Eng. Struct., Vol. 28, pp. 229-239.   DOI
2 M. G. Cockcroft, D. H. Latham, 1968, Ductile and the workability of metals, J. Inst. Metals, Vol. 96, pp. 33-39.
3 Scientific Forming Technologies Corporation, 2008, DEFORM-3D Version 6.1 User’'s Manual.
4 H. Kim, M. Yamanaka, T. Altan, 1995, Prediction and Elimination of Ductile Fracture in Cold Forging Using FEM Simulation, Proc. NAMRC, pp. 63-69.
5 D. W. Jung, 2002, Analysis of Free Forging of Cylindrical Billets by Using Finite Element Method, J. Ocean Eng. Technol., Vol. 16, No. 6, pp. 49-54.   과학기술학회마을
6 J. H. Son, D. W. Bae, C. W. Park, H. Y. Lee, H. K. Seo, C. M. Seo, 2007, Study on Precision Cold Forming Process Design and Forming Analysis of Inner Sleeve Using 3D Finite Element Method, Proc. Kor. Soc. Precision Eng. Spring, pp. 579-580.   과학기술학회마을
7 S. Kubota, T. Yamamoto, M. Yamanaka, 2007, Forging Process Design by the Computer Simulation, Trans. Mater. Process., Vol. 16, No. 2, pp. 95-100.   과학기술학회마을   DOI
8 Y. K. Kong, B. D. Lowe, S. J. Lee, E. F. Krieg, 2008, Evaluation of handle shapes for screw driving, Applied Ergonomics, Vol. 39, pp. 191-198.   DOI   ScienceOn
9 D. J. Kim, D. C. Ho, B. M. Kim, J. C. Choi, 1996, The Prediction of Geometric Configuration and Ductile Fracture Using the Artificial Neural Network for a Cold Forged Product, J. Kor. Soc. Precision Eng., Vol. 13, No. 10, pp. 105-111.   과학기술학회마을