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Simulation of Chatter in Cold Rolling Strip using Finite Element Method R. Mehrabi; S. Ziaei-Rad; M. Salimi ABSTRACT Chatter is a particular case of self-excited vibrations, which arise in rolling operations because of the interaction between the structural dynamics of the mill stand and dynamics of the rolling process. The model presented here has two sub models one for structure of the mill and the other for the rolling process. The structure of a mill stand modeled as a system of linear spring and lumped masses in order to simulation the interaction between the rolls. In this paper, to analyze the chatter vibration a dynamic model of cold rolling process using finite element method (FEM) is considered. The influence of rolling parameters such as rolling speed, reduction and friction coefficient on chatter vibration is investigated and it was showed that the possibility of chatter onset increased by raising the rolling velocity and decrease friction coefficient. Predicted values of the model are in good agreement with that of the experiments as well as the values obtained by other researchers. KEYWORDS Chatter, Self-excited, Mill, Lumped Masses, Finite Element. %!&'#$#!" %!&&#,#%"
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Yun, I.; “Chatter in Cold Rolling”, Ph.D. thesis, Northwestern University, Evanston, Illinois, 1995.
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Roberts, W. L.; “Cold Rolling of steel”, Marcel Dekker, New york, 1978.
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Tamiya, T.; Furui, K.; Iida, H.; “Analysis of chattering phenomenon in cold rolling”, Proceedings of International Conference on Steel Rolling, ISIJ, Tokyo, p.p. 1191–1202, 1980.
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Chefneux, L.; Fischbach, J. P.; Gouzou, J.; “Study and Control of Chatter in Cold Rolling”, Iron and Steel Engineer, p.p. 17-26, 1982.
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Yun, I.; Wilson, W. R. D.; Ehmann, K.F.; “Review of Chatter studies in cold rolling”, International Journal of Machine Tools and Manufacture, Vol. 38, p.p. 14991530, 1998. Gallenstein, J.H.; “Torsional chatter on a 4-h cold mill”, AISE Year Book, p.p. 60–65, 1981.
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Johnson, R. E.; Qi, Q.; “Chatter dynamics in sheet rolling”. Int. J. Mech. Sci, p.p. 617-630, 1994.
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Nieb, J.; Nicolas, V.: “Automated monitoring and control of vibration and chatter in rolling processes”, Iron and Steel Engineer, p.p. 33–42, 1991.
Guo, R. M.; Urso, A.C.; “Analysis of chatter vibration phenomena of rolling mills using finite element method”, Iron and Steel Engineer, p.p. 29–39, 2001.
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Hu, P. H.; Ehmann K.F.; “Five octave mode chatter in rolling”, Proc. Inst. Mech. Engrs., vol. 215, 2000.
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Misonoh, K.: “Analysis of chattering in cold rolling of steel strip”, Journal of the JSTP, vol. 21, p.p. 1006–1010, 1980. Nessler, G.L.; Cory, J.F.; “Cause and solution of fifth octave backup roll chatter on 4-h cold mills and temper mills”, Iron and Steel Engineer, p.p. 482–486, 1989.
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Archive of SID Kimura, Y.; Sodani, Y.; “Analysis of Chatter in Tandem Cold Rolling Mills, ISIJ International”, vol. 33, p.p.7784, 2003.
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