Closure to “Discussions of ‘A Refined Model for the Hydrodynamic Lubrication of Strip Rolling’” (1976, ASME J. Lubr. Technol., 98, pp. 431–432)

1976 ◽  
Vol 98 (3) ◽  
pp. 432-432 ◽  
Author(s):  
W. R. D. Wilson ◽  
L. E. Murch
Keyword(s):  
Hydrodynamic Lubrication ◽  
Refined Model ◽  
Strip Rolling

A Refined Model for the Hydrodynamic Lubrication of Strip Rolling

1976 ◽  
Vol 98 (3) ◽  
pp. 426-431 ◽  
Author(s):  
W. R. D. Wilson ◽  
L. E. Murch
Keyword(s):  
Thermal Effects ◽  
High Speed ◽  
Thermal Loading ◽  
Hydrodynamic Lubrication ◽  
Film Formation ◽  
Work Zone ◽  
Work Piece ◽  
Refined Model ◽  
Forward Slip ◽  
Strip Rolling

An analytical model for the hydrodynamic lubrication of high speed strip rolling is developed. The model includes the effect of thermal loading due to back flow and slip on the film formation process. The work zone analysis takes account of thermal effects on film thickness and friction. The influence of geometry, speed and lubricant and work-piece properties on the forward slip, roll load and torque are described in detail and compared with previously published experimental data.

Hydrodynamic Lubrication in Rolling of Thin Strips

1972 ◽  
Vol 94 (1) ◽  
pp. 317-328 ◽  
Author(s):  
B. Avitzur ◽  
G. Grossman
Keyword(s):  
Dimensionless Parameter ◽  
Hydrodynamic Lubrication ◽  
Strip Thickness ◽  
Thin Strip ◽  
Strip Rolling ◽  
Roll Velocity ◽  
The Subject ◽  
Hydrodynamic Effects ◽  
Lubrication Effect ◽  
Lubricant Viscosity

The process of thin strip rolling is analyzed considering the hydrodynamic lubrication effect. Hydrodynamic lubrication prevails when a film of lubricant fully separates the rolls from the strip. The conditions which produce hydrodynamic effects are the subject of this study. A dimensionless parameter, the Sommerfeld Number, is defined as a function of lubricant viscosity, roll velocity, strip thickness, and yield strength of the material. The critical Sommerfeld Number for occurrence of hydrodynamic lubrication is determined. Increasing lubricant viscosity and roll velocity or decreasing flow stress and strip thickness produce a larger Sommerfeld Number with an increased tendency for hydrodynamic effects. The thickness of the lubricant film and the velocity of the emerging strip are both determined as functions of the Sommerfeld Number, reduction in strip thickness, and of roll diameter. Graphical and numerical examples are presented.

Full Film Lubrication of Strip Rolling

1994 ◽  
Vol 116 (3) ◽  
pp. 569-576 ◽  
Author(s):  
Chung-Yeh Sa ◽  
William R. D. Wilson
Keyword(s):  
Hydrodynamic Lubrication ◽  
Thermal Analyses ◽  
Speed Ratio ◽  
Process Variables ◽  
Strip Rolling ◽  
Polyphenyl Ether ◽  
Roll Torque ◽  
Global Condition ◽  
Roll Separating Force ◽  
Film Lubrication

A mathematical model for liquid lubricated strip rolling in the full-film regime is developed. The model combines slab plasticity, hydrodynamic lubrication and thermal analyses to relate local and global condition to process variables and material properties. The predictions of the model are compared with experimental measurements of outlet speed ratio, roll separating force and roll torque in rolling 1100-H14 aluminum with a viscous mineral oil and 5P4E polyphenyl ether as lubricants. The excellent agreement which is obtained provides powerful support of the validity of the model.

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