Rolling of Thin Strip and Foil: Application of a Tribological Model for “Mixed” Lubrication
Author:
Le HR1, Sutcliffe M. P. F.1
Affiliation:
1. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
Abstract
A mechanical model of cold rolling of foil is coupled with a sophisticated tribological model. The tribological model treats the “mixed” lubrication regime of practical interest, in which there is “real” contact between the roll and strip as well as pressurized oil between the surfaces. The variation of oil film thickness and contact ratio in the bite is found by considering flattening of asperities on the foil and the build-up of hydrodynamic pressure through the bite. The boundary friction coefficient for the contact areas is taken from strip drawing tests under similar tribological conditions. Theoretical results confirm that roll load and forward slip decrease with increasing rolling speed due to the decrease in contact ratio and friction. The predictions of the model are verified using mill trials under industrial conditions. For both thin strip and foil, the load predicted by the model has reasonable agreement with the measurements. For rolling of foil, forward slip is overestimated. This is greatly improved if a variation of friction through the bite is considered.
Publisher
ASME International
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference31 articles.
1. Fleck, N. A., Johnson, K. L., Mear, M. E., and Zhang, L. C., 1992, “Cold Rolling of Foil,” Proc. Instn. Mech. Engrs, 206, pp. 119–131. 2. Johnson, K. L., 1985, Contact Mechanics, Cambridge University Press, Cambridge, UK. 3. Dixon, A. E., and Yuen, W. Y. D., 1995, “A Computationally Fast Method to Model Thin Strip Rolling,” Proc. Computational Techniques and Application Conference, pp. 239–246. 4. Gratacos, P., Montmittonet, P., Fromholz, P., and Chenot, J. L., 1992, “A Plane-Strain Elastic Finite-Element Model for Cold Rolling of Thin Strip,” Int. J. Mech. Sci., 34, pp. 195–210. 5. Le, H. R., and Sutcliffe, M. P. F., 2001, “A Robust Model for Rolling of Thin Strip and Foil,” Int. J. Mech. Sci., 43, pp. 1405–1419.
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