Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Design of Cold Heading Process of a Screw for Storage Parts

저장매체용 스크류의 냉간 헤딩 공정 설계에 대한 연구

  • 서원상 (서울과학기술대학교 NID 융합대학원) ;
  • 민병욱 (서울과학기술대학교 NID 융합대학원) ;
  • 박근 (서울과학기술대학교 기계설계자동화공학부) ;
  • 나승우 ((주) 서울금속 기술연구소) ;
  • 이상훈 (서울과학기술대학교 자동차공학과) ;
  • 김종호 (서울과학기술대학교 제품설계금형공학과) ;
  • 김종봉 (서울과학기술대학교 자동차공학과)
  • Received : 2010.12.27
  • Accepted : 2011.01.24
  • Published : 2011.02.01
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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

References

  1. 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.
  2. 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.
  3. S. Kubota, T. Yamamoto, M. Yamanaka, 2007, Forging Process Design by the Computer Simulation, Trans. Mater. Process., Vol. 16, No. 2, pp. 95-100. https://doi.org/10.5228/KSPP.2007.16.2.095
  4. 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. https://doi.org/10.1016/j.apergo.2007.05.003
  5. 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.
  6. J. Chen, B. Young, 2006, Stress-strain curves for stainless steel at elevated temperatures, Eng. Struct., Vol. 28, pp. 229-239. https://doi.org/10.1016/j.engstruct.2005.07.005
  7. M. G. Cockcroft, D. H. Latham, 1968, Ductile and the workability of metals, J. Inst. Metals, Vol. 96, pp. 33-39.
  8. Scientific Forming Technologies Corporation, 2008, DEFORM-3D Version 6.1 User’'s Manual.
  9. H. Kim, M. Yamanaka, T. Altan, 1995, Prediction and Elimination of Ductile Fracture in Cold Forging Using FEM Simulation, Proc. NAMRC, pp. 63-69.

Cited by

  1. Damage prediction in the multistep forging process of subminiature screws vol.13, pp.9, 2012, https://doi.org/10.1007/s12541-012-0212-2
  2. Finite Element Analysis for Improvement of Folding Defects in the Forging Process of Subminiature Screws vol.32, pp.6, 2015, https://doi.org/10.7736/KSPE.2015.32.6.509
  3. Design of Cold Forging Process of Micro Screw for Mobile Devices vol.16, pp.6, 2015, https://doi.org/10.5762/KAIS.2015.16.6.3692