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Roll Force Prediction of High-Strength Steel Using Foil Rolling Theory in Cold Skin Pass Rolling

고강도강의 냉간 조질 압연 시 호일 압연이론을 이용한 압연하중의 예측

  • Song, Gil Ho (Rolling & Measurement Research Group of Posco Technical Research Laboratory) ;
  • Jung, Jae Chook (Rolling & Measurement Research Group of Posco Technical Research Laboratory)
  • 송길호 (포스코 기술연구원 압연계측연구그룹) ;
  • 정제숙 (포스코 기술연구원 압연계측연구그룹)
  • Received : 2012.07.03
  • Accepted : 2012.10.08
  • Published : 2013.02.04

Abstract

Skin pass rolling is a very important process for applying a certain elongation to a strip in the cold rolling and annealing processes, which play an important role in preventing the stretching of the yield point when the material is processed. The exact prediction of the rolling force is essential for obtaining a given elongation with the steel grade and strip size. Unlike hot rolling and cold rolling, skin pass rolling is used to apply an elongation of within 2% to the strip. Under a small reduction, it is difficult to predict the rolling force because the elastic deformation behavior of the rolls is complicated and a model for predicting the rolling force has not yet been established. Nevertheless, the exact prediction of the rolling force in skin pass rolling has gained increasing importance in recent times with the rapid development of high-strength steels for use in automobiles. In this study, the possibility of predicting the rolling force in skin pass rolling for producing various steel grades was examined using foil rolling theory, which is known to have similar elastic deformation behavior of rolls in the roll bite. It was found that a noncircular arc model is more accurate than a circular model in predicting the roll force of high-strength steel below TS 980 MPa in skin pass rolling.

Keywords

Skin Pass Rolling;Rolling Force;Foil Rolling;Roll Bite;Flattening Deformation;Non Circular Arc Model

References

  1. Fleck, N.A and Johnson,K.L., 1987, Towards a New Theory of Cold Rolling Thin Foil, Int.J.Mech.Sci., Vol 29. No.7. pp.507-524. https://doi.org/10.1016/0020-7403(87)90012-9
  2. Bland, D.R. and Ford, H., 1948, The Calculation of roll Force and Torque in Cold Strip Rolling with Tensons, Proc. Inst. Mech. Engrs, Vol.159, pp.144 https://doi.org/10.1243/PIME_PROC_1948_159_015_02
  3. Ford, H. and Alexander, J.M., 1959, Rolling Hard Material in Thin Gauges. Basic Consideration, J. Inst. Metals, Vol. 88, p.193
  4. Johnson, K.L. and Bentall, R.H., 1969, The Onset of Yield in the Cold Rolling of Tin Strip, J.Mech.Phys.Solids , Vol.17, p.253 https://doi.org/10.1016/0022-5096(69)90015-5
  5. Grimble, M.J., 1978, Solution of Nonlinear Funtional Equations Representing the Roll Gap Relationships in a Cold Mill, J.Optimization Theor. Applic., Vol.26, No.3, p.427 https://doi.org/10.1007/BF00933464
  6. Quan, Z., 1984, Deformation Characteristics of the Cross Shear Cold Rolling of Ultra Thin Strip and the Theory of the Estic Plug, Proc. Adv. Technol. Plastic, Vol. 2, p.1173
  7. Yuen, W.Y.D, 1996, The Modelling of the Mechanics of Deformation in Flat Rolling, Journal of Meterials Processing Technology, pp. 87-94
  8. Yuen, W.Y.D, 2003, On-Line and Off-Line Models for the Rolling Process, Scandinavian Journal of Metallurgy, pp.86-93
  9. Alexander, K. and Konrad, K., 2003, FE-Simulation of Thin Strip and Temper Rolling Processes, ABAQUS Austria User's Conference
  10. Sun, J.-n., Huang, H.-g., 2009, Nonlinear Finite Element Analysis of Thin Strip Temper Rolling Process, Eournal of Iron and Steel Research, Vol.16, No.4, pp. 27-32.