Effect of Rolling Parameters on Thin Strip Profile in Cold Rolling

Authors: H. B. Tibar, Z. Y. Jiang

Abstract:

In this study, the influence of rolling process parameters such as the work roll cross angle and work roll shifting value on the strip shape and profile of aluminum have been investigated under dry conditions at a speed ratio of 1.3 using Hille 100 experimental mill. The strip profile was found to improve significantly with increase in work roll cross angle from 0^o to 1^o, with an associated decrease in rolling force. The effect of roll shifting (from 0 to 8mm) was not as significant as the roll cross angle. However, an increase in work roll shifting value achieved a similar decrease in rolling force as that of work roll cross angle. The effect of work roll shifting was also found to be maximum at an optimum roll speed of 0.0986 m/s for the desired thickness. Of all these parameters, the most significant effect of the strip shape profile was observed with variation of work roll cross angle. However, the rolling force can be a significantly reduced by either increasing the the work roll cross angle or work roll shifting.

Keywords: Rolling speed ratio, strip shape, work roll cross angle, work roll shifting.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1339095

References:

[1] Groover, M.P., Fundamentals of Modern Manufacturing Material, Process and systems. 2nd ed. 2002, New York: John Wiley & Sons.
[2] Jiang, Z.Y., et al., Modelling of work roll edge contact in thin strip. Journal of Materials Processing Technology, 2004. 155-156: pp. 1280-1285.
[3] Jiang, Z.Y., et al., Finite element simulation of cold rolling of thin strip. Journal of Materials Processing Technology, 2003. 140: pp. 542-547.
[4] Montmitonnet, P., et al., Modeling for geometrical control in cold and hot rolling Ironmaking & Steelmaking 1993. 20: pp. 254-60.
[5] Ginzburg, V.B., Steel-Rolling Technology: Theory and Practice. 1989, New York: Marcel Dekker Inc.
[6] Robert, W.L., Strip Shape: Its measurment and control, in Cold rolling of steel, G.a.D. Boothroyd, G.E, Editor. 1978, Marcel Dekker: New York. pp. 655-716.
[7] Malik, A.S. and R.V. Grandhi, A computational method to predict strip profile in rolling mills. Journal of Material Processing Technology, 2008. 206: pp. 263-274.
[8] Jiang, Z.Y., Du X. Z., Du, Y. B., Wei, D.B. and Hay, M., strip shape analysis of asymmetrical cold rolling of thin strip. Advanced Material Research, 2010. 97-101: pp. 81-84.
[9] Jiang, Z.Y, Zhu, H.T. and Tieu, A.K, Study of work roll edge contact in asymmetrical rolling by modified influence function method. Journal of Materials Processing Technology, Vol. 162-163, pp512-518.
[10] W.J. Edwards, P.D. Spooner, Analysis of strip shape, in: G.F. Bryand (Ed.), Automation of Tandem Mills, The Iron and Steel Institute, 1973, pp. 177–212.
[11] Hwu, Y.J. and Lenard, J.G., Phase transformation temperatures of an ultra-low carbon steel, Trans. ASME 110 (1988) 22–27.
[12] Kawanami, T., Asamura, T. and Matsumoto, H, Development of high precision shape and crown control technology for strip rolling. Journal of Materials Processing Technology, Vol. 22, pp257 – 275.
[13] Roberts, W.L., Flat Processing of Steel. Marcel Decker Inc, New York, 1978.
[14] Jiang, Z.Y, Xiong, S.W., Tieu, A.K. and Jane Wang, Q, Modelling the effect of friction on cold strip rolling. Journal of Materials Processing Technology, Vol. 201, pp85-90.
[15] Hay, M, Shape and Profile Development of Thin Strip Rolling. University of Wollongong, 2008.
[16] Jacobson, T., A study of strip edge crack in thin strip rolling: Shape and Profile development of Thin Strip Rolling. University of Wollongong, 2009.