The Influence of Elastic Deformation of the Roll and the Sheet in a Hydrodynamically Lubricated Cold Rolling Process

[+] Author and Article Information
P. M. Lugt

Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands

W. E. ten Napel

University of Twente, P.O. Box 217, 7500 Enschede, The Netherlands

J. Tribol 117(3), 468-475 (Jul 01, 1995) (8 pages) doi:10.1115/1.2831277 History: Received September 16, 1993; Revised July 04, 1994; Online January 24, 2008


A model has been developed for simulating hydrodynamic lubrication in cold rolling. Both Roelands’ and Barus’ viscosity-pressure relations have been applied. Thermal effects regarding heat development caused by plastic deformation as well as work hardening have been included. Furthermore, elastic deformation of the surfaces has fully been incorporated in the model, i.e., elastic deformation of both the strip and the rolls. The governing equations have been solved numerically throughout the entire contact i.e. inlet, work and outlet zone using a very dense grid. Multigrid techniques have been used to solve the equations. It will be shown here that roll flattening has a significant effect on film thickness. However, elastic deformation of the strip material in the inlet region even has a more pronounced effect on film thickness and thus on several process conditions. Furthermore, it is shown that the choice of the viscosity-pressure parameter is limited. Higher values of this parameter cause excessive shear stresses on the strip surface.

Copyright © 1995 by The American Society of Mechanical Engineers
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