한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제32권6호
  • /
  • Pages.509-515
  • /
  • 2015
  • /
  • 1225-9071(pISSN)
  • /
  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지
DOI QR코드

DOI QR Code

초소형 나사 단조시 접힘결함 향상을 위한 유한요소해석

Finite Element Analysis for Improvement of Folding Defects in the Forging Process of Subminiature Screws

  • 이지은 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김종봉 (서울과학기술대학교 기계자동차공학과) ;
  • 박근 (서울과학기술대학교 기계시스템디자인공학과)
  • Lee, Ji Eun (Department of Mechanical System and Design Engineering, Seoul National University of Science and Technology) ;
  • Kim, Jong Bong (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Park, Keun (Department of Mechanical System and Design Engineering, Seoul National University of Science and Technology)
  • 투고 : 2015.05.18
  • 심사 : 2015.05.26
  • 발행 : 2015.06.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Recent trends to reduce the size of mobile electronics products have driven miniaturization of various components, including screw parts for assembling components. Considering that the size reduction of screws may degenerate their joining capabilities, the size reduction should not be limited to the thread region but should be extended to its head region. The screw head is usually manufactured by forging in which a profiled punch presses a billet so that plastic deformation occurs to form the desired shape. In this study, finite element (FE) analysis was performed to simulate the forging process of a subminiature screw; a screw head of 1.7 mm diameter is formed out of a 0.82 mm diameter billet. The FE analysis result indicates that this severe forging condition leads to a generation of folding defects. FE analyses were further performed to find appropriate punch design parameters that minimize the amount of folding defects.

키워드

참고문헌

  1. Min, K. B., Kim, J. B., Park, K., and Ra, S. W., "Evaluation of Clamping Characteristics for Subminiature Screws according to Thread Angle Variation," J. Korean Soc. Precis. Eng., Vol. 31, No. 9, pp. 839-846, 2014. https://doi.org/10.7736/KSPE.2014.31.9.839
  2. Drean, M., Habraken, A. M., Bouchair, A., and Muzeau, J. P., "Swaged Bolts: Modelling of the Installation Process and Numerical Analysis of the Mechanical Behavior," Computer & Structure, Vol. 80, No. 27-30, pp. 2361-2373, 2002. https://doi.org/10.1016/S0045-7949(02)00240-7
  3. Altan, T. and Vazquez, V., "Numerical Process Simulation for Tool and Process Design in Bulk Metal Forming," CIRP Annals-Manufacturing Technology, Vol. 45, No. 2, pp. 599-615, 1996. https://doi.org/10.1016/S0007-8506(07)60514-9
  4. Lee, Y. K., Lee, S. R., Lee, C. H., and Yang, D. Y., "Process Modification of Bevel Gear Forging using Three-dimensional Finite Element Analysis," Journal of Materials Processing Technology," Vol. 113, No.1, pp. 59-63, 2001. https://doi.org/10.1016/S0924-0136(01)00701-4
  5. Petrov, P., Perfilov, V., and Stebunov, S., "Prevention of Lap Formation in Near Net Shape Isothermal Forging Technology of Part of Irregular Shape Made of Aluminum Alloy A92618," Journal of Materials Processing Technology, Vol. 177, No. 1-3, pp. 218-223, 2006. https://doi.org/10.1016/j.jmatprotec.2006.03.206
  6. Lee, M. C., Park, R. H., Jun, B. Y., and Joun, M. S., "Adaptive Finite Element Analysis of an Enclosed Die Forging Process of a Bevel Gear and Its Experimental Verification," J. Korean Soc. Precis. Eng., Vol. 23, No. 4, pp. 37-43, 2006.
  7. Ku, T. W. and Kang, B. S., "Tool Design and Experimental Verification for Multi-stage Cold Forging Process of the Outer Race," Int. J. Precis. Eng. Manuf., Vol. 15, No. 9, pp. 1995-2004, 2014. https://doi.org/10.1007/s12541-014-0556-x
  8. Seo, W. S., Min, B. W., Park, K., Ra, S. W., Lee, S. H., et al., "Design of Cold Heading Process of a Screw for Storage Parts," Transactions of Materials Processing, Vol. 20, No. 1, pp. 48-53, 2011. https://doi.org/10.5228/KSTP.2011.20.1.48
  9. Kim, J. B., Seo, W. S., and Park, K., "Damage Prediction in the Multistep Forging Process of Subminiature Screws," Int. J. Precis. Eng. Manuf., Vol. 13, No. 9, pp. 1619-1624, 2012. https://doi.org/10.1007/s12541-012-0212-2
  10. Song, J. H., Lee, J., Lee, H. J., Lee, G. A., Park, K. D., et al., "Numerical Analysis and Experimental Study of Thread Rolling Process for Micro-sized Screw (Part II: Application to a Micro-screw with Diameter of 800 ${\mu}m$)," Transactions of Materials Processing, Vol. 21, No. 3, pp. 179-185, 2012. https://doi.org/10.5228/KSTP.2012.21.3.179
  11. Jang, S. J., Lee, M. C., Shim, S. H., Son., Y. H., Yoon, D. J., et al., "Finite Element Analysis of Manufacturing Process of a 12 Point Flange Head Bolt with Emphasis on Thread Rolling Process," Transactions of Materials Processing, Vol. 19, No. 4, pp. 248-252, 2010. https://doi.org/10.5228/KSPP.2010.19.4.248

피인용 문헌

  1. Investigation into Thread Rolling Characteristics of Subminiature Screws According to Thread Shapes vol.40, pp.11, 2016, https://doi.org/10.3795/KSME-A.2016.40.11.971
  2. Seismic Analysis of Concrete Dam by Using Finite Element Method vol.103, pp.2261-236X, 2017, https://doi.org/10.1051/matecconf/201710302024