Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Thread Rolling Analysis for Lead Screw Process Design

Lead Screw 공정 설계를 위한 전조 해석

  • Shin, Myoung-Soo (The Graduate School of NID, Seoul National University of Technology) ;
  • Cha, Sung-Hoon (The Graduate School of NID, Seoul National University of Technology) ;
  • Kim, Jong-Bong (Department of Automotive Engineering, Seoul National University of Technology) ;
  • Kim, Jong-Ho (Department of Die and Mould Design, Seoul National University of Technology) ;
  • Ra, Seung-Woo (Seoul Metal Co.)
  • 신명수 (서울산업대학교 NID융합기술대학원) ;
  • 차성훈 (서울산업대학교 NID융합기술대학원) ;
  • 김종봉 (서울산업대학교 자동차공학과) ;
  • 김종호 (서울산업대학교 금형설계학과) ;
  • 나승우 ((주)서울금속)
  • Published : 2009.12.31
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Abstract

This paper presents the numerical analysis of thread rolling. Firstly, the analysis is focused on the effective analysis conditions that guarantee the reliability of the analysis results. The investigated parameters are the number of teeth and the number of elements. Using the analysis results, the number of elements and the number of teeth that guarantee the results are found. And then, the effects of the process parameters such as tool shape and temperature on the thread rolling are investigated. The analysis is carried out using DEFORM-3D. The results show that the flank angle and crest round have an effect on the thread rolling load. It is also shown that temperature have significant effects on the effective strain distribution, rolling load, and crack initiation. The crack initiation is predicted using the Cockcroft-Latham criterion.

본 연구에서는 전조공정의 수치해석을 수행하였다. 해석을 이용한 공정 인자 설계에 앞서서, 효율적이고 신뢰성 있는 해석을 위한 해석 조건에 대하여 연구를 수행하였다. 치형의 개수와 요소의 수에 대한 해석 결과를 바탕으로 해석의 정도를 보장하고 효율적으로 해석을 수행할 수 있는 조건을 설정하였다. 그리고, 프랭크 각도와 치형의 끝단부 라운드 등의 금형의 형상과 성형 온도가 유효 응력, 유효 변형율, 전조력, 그리고 크랙 발생에 미치는 영향을 알아보았다. 해석은 DEFORM-3D를 이용하여 수행하였다. 프랭크 각도와 치형의 끝단 부 라운드는 전조력에 영향을 미치는 것을 확인할 수 있었으며, 성형 온도 조건에 따라서 유효 변형률과 전조력, 그리고 크랙을 예상 할 수 있었다.

Keywords

References

  1. J. Schey, 'Introduction to Manufacturing Process', McGraw-Hill, 254 (1997)
  2. P. F. Ostwald and J. Munoz, 'Manufacturing processes and system', 9th Edition, 518 (1997)
  3. K .H. Kim, D. H. Kim, and B. K. Kim, 'Determination of optimum blank diameter for the high precision of spindle screw', Transactions of Materials Processing, 11, 710 (2002) https://doi.org/10.5228/KSPP.2002.11.8.710
  4. K. H. Kim, D. H. Kim, D. C. Ko, and B. K. Kim, 'Characteristics evaluation of process parameters for improvement the precision of tread rolling in lead screw', Proc. of KSPE Fall, 321 (2002)
  5. D. C. KO, J. M. Lee, and B. M. Kim, 'Development of form rolling technology for high precision worm using the rack dics of counter flow type', Journal of KSPE, 21, 57 (2004)
  6. J. P. Domblesky and F. Feng, 'A parametric study of process parameters in external thread rolling', Journal of Materials Processing Technology, 121, 341 (2002) https://doi.org/10.1016/S0924-0136(01)01223-7
  7. H. W. Lee, J. H. Song, G. A. Lee, H. J. Lee, K. D. Park, and S. M. Bae, 'Thread forming of a micro screw for storage devices using finite element analysis ', Proc. of Transactions of Materials Processing, Spring, 55 (2009)
  8. J. Chen and B. Young, 'Stress-strain curves for stainless steel at elevated temperatures', Engineering Structures, 28, 229 (2006) https://doi.org/10.1016/j.engstruct.2005.07.005
  9. J. Walters, 'Memorial Seminar on Metal Forming', A state of the art overview for industry, 5 (1997)
  10. J. R. Davis, 'Metals handbook', ASM International, 16, 9th Edition, 280 (1989)
  11. J. T, Drozda and C. Wick 'Tool and manufacturing engineering handbook', Society of Manufacturing Engineers, 1, 12 (1983)
  12. M.J. Cockcroft and D.J. Latham, 'Ductility and workability of metals', J. Inst. Metals, 96, 33 (1968)