A Thermal Hydrodynamic Lubrication Analysis for Entrained Film Thickness in Cold Strip Rolling

[+] Author and Article Information
K. Yuan, B. C. Chern

Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 10764

J. Tribol 112(1), 128-134 (Jan 01, 1990) (7 pages) doi:10.1115/1.2920217 History: Received September 29, 1988; Online June 05, 2008


A thermal hydrodynamic lubrication analysis which takes account of temperature-dependent viscosity variation along as well as across the film thickness is developed for the entrained film thickness in cold strip rolling using generalized Reynolds equation (Dowson, 1962). The results are compared with that of the two approximate models (i.e., the effective viscosity model and thermal Reynolds equation model) being widely used in metal forming lubrication literature. It is found that neither of the two approximate models is more accurate than the other and that neither can deal with the effect of surface temperature difference of the roll and strip adequately.

Copyright © 1990 by The American Society of Mechanical Engineers
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