Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Stress Analysis of Cold Rolled Strip Coiling Process

냉연재 권취공정의 응력해석

  • 박규태 (포항공과대학교 기계공학과) ;
  • 박용희 (포항공과대학교 엔지니어링대학원) ;
  • 박현철 (포항공과대학교 기계공학과) ;
  • 원성연 (POSCO 기술연구원) ;
  • 홍완기 (POSCO 기술연구원)
  • Received : 2016.02.02
  • Accepted : 2016.12.23
  • Published : 2017.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

In the thin strip coiling process, it is necessary to use a sleeve with a mandrel to prevent excessive deformation of the strip. The stress distribution in the sleeve and strip is an important factor to determine the size of the sleeve. However, an experimental approach is almost impossible because of the accumulation of high pressure. A finite element (FE) model of the strip coiling process was developed in this study. Then, the radial and hoop stresses on the sleeve and strip were investigated using FE analyses. The theoretical values and analysis results under idealized conditions were compared to verify the FE model. The effect of the strip thickness on the stress distribution was also investigated. The radial stress increased by 6.3 times for a 1-mm-thick strip at the coil starting point. The radial stress at the sleeve increased by 14.8 % with a stacked thickness of 90 mm because of the reaction force applied by the mandrel.

두께가 얇은 스트립의 권취공정에서는 맨드렐과 함께 슬리브가 사용된다. 이때 스트립과 슬리브의 응력분포는 코일의 좌굴 및 슬리브의 두께 결정에 중요한 요인으로 작용한다. 하지만 스트립 권취 시 압력이 과도하게 누적됨에 따라 이를 실측하는 데에는 어려움이 있다. 이에 본 논문에서는 권취공정에 대한 유한요소모델을 수립하였다. 제안된 모델을 이용하여 슬리브의 반경, 원주방향 응력 및 스트립 층간 응력에 대해 분석하였다. 스트립 두께 변화에 따른 응력분포를 확인하였으며, 1 mm 스트립의 경우 권취 시작점에서 6.3배 큰 응력이 발생하였다. 맨드렐이 제공하는 반력에 의해 스트립 90 mm 적층 시 슬리브의 반경방향 응력이 선행이론대비 14.8 % 증가하였다.

Keywords

References

  1. Lee, J. S., Shin, K. H., Kang, H. K. and Park, S. S., 2010, "An Analysis of Tension at Rewinding Process Considering Mechanical Property Change in Roll to Roll System," Proc. of KSPE Autumn Conference, pp. 257-258.
  2. Burns, S. J., Meehan, R. R. and Lambropoulos, J. C., 1999, "Strain-based Formulas for Stresses in Profiled Center-Wound Rolls," Tappi Journal, Vol. 82, No. 7, pp. 159-167.
  3. Lee, C. W., 2014, "Effect of Taper Tension Profiles on Radial Stress of a Wound Roll in Roll-to-roll Winding Process," J. Korean Soc. Precis. Eng., Vol. 31, No. 2, pp. 125-131. https://doi.org/10.7736/KSPE.2014.31.2.125
  4. Lee, C. W., Kang, H. K. and Shin, K. H., 2012, "Advanced Taper Tension Method for the Performance Improvement of a Roll-to-roll Printing Production Line with a Winding Process," Int. J. Mech. Sci., Vol. 59, No. 1, pp. 61-72. https://doi.org/10.1016/j.ijmecsci.2012.03.005
  5. Yanagi, S., Hattori, S., Maeda, Y., Ibata, H., Sugimoto, Y. and Sawada, M., 1998, "Coil Deformation and Flatness Change through Strip Coiling Process," Proc. 7th Int. Conf. on Steel Rolling, pp. 150-155.
  6. Park, W. W., Kim, D. K., Lim, Y. T., Kwon, H. C., Choi, D. K. and Chun, M. S., 2012, "Stress Analysis for Strip Coiling Process based on Elastic Model," Proc. KSTP Fall Conference, pp. 273-276.
  7. Sims, R. B. and Place, J. A., 1953, "The Stresses in the Reels of Cold Reduction Mills," Brit. J. Appl. Phys., Vol. 4, No. 7, p. 213. https://doi.org/10.1088/0508-3443/4/7/306
  8. Case, J., 2014, The Strength of Materials (Second Edition), Edward Arnold & Co, London, pp. 437-455.