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.
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January 2002
Technical Papers
Rolling of Thin Strip and Foil: Application of a Tribological Model for “Mixed” Lubrication
HR Le,
e-mail: hl220@eng.cam.ac.uk
HR Le
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
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M. P. F. Sutcliffe
M. P. F. Sutcliffe
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
Search for other works by this author on:
HR Le
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
e-mail: hl220@eng.cam.ac.uk
M. P. F. Sutcliffe
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
Contributed by the Tribology Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for presentation at the STLE/ASME Tribology Conference, San Francisco, CA, October 22–24, 2001. Manuscript received by the Tribology Division February 2, 2001; revised manuscript received July 3, 2001. Associate Editor: T. C. Ovaert.
J. Tribol. Jan 2002, 124(1): 129-136 (8 pages)
Published Online: July 3, 2001
Article history
Received:
February 2, 2001
Revised:
July 3, 2001
Citation
Le, H., and Sutcliffe, M. P. F. (July 3, 2001). "Rolling of Thin Strip and Foil: Application of a Tribological Model for “Mixed” Lubrication ." ASME. J. Tribol. January 2002; 124(1): 129–136. https://doi.org/10.1115/1.1402179
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