A mixed film lubrication model for strip rolling and its correlation with experiment

2000 ◽  
pp. 457-465 ◽  
Author(s):  
A.K. Tieu ◽  
Z.L. Qiu ◽  
R. De Oliveira ◽  
Y. Liu
Keyword(s):  
Strip Rolling ◽  
Mixed Film ◽  
Film Lubrication

A thermal analysis of strip-rolling in mixed-film lubrication with O/W emulsions

2006 ◽  
Vol 39 (12) ◽  
pp. 1591-1600 ◽  
Author(s):  
A.K. Tieu ◽  
P.B. Kosasih ◽  
A. Godbole
Keyword(s):  
Thermal Analysis ◽  
Strip Rolling ◽  
Mixed Film ◽  
Film Lubrication

Mixed film lubrication of strip rolling using O/W emulsions

2007 ◽  
Vol 40 (5) ◽  
pp. 709-716 ◽  
Author(s):  
P.B. Kosasih ◽  
A.K. Tieu
Keyword(s):  
Strip Rolling ◽  
Mixed Film ◽  
Film Lubrication

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.

Porous Retainers for Rolling Bearings

1981 ◽  
Vol 23 (6) ◽  
pp. 263-271
Author(s):  
R. Gohar ◽  
H. So
Keyword(s):  
Ball Bearing ◽  
Porous Matrix ◽  
Critical Value ◽  
Eccentricity Ratio ◽  
Rolling Bearings ◽  
High Coefficient ◽  
Lubrication Regime ◽  
Permeability Parameter ◽  
Mixed Film ◽  
Film Lubrication

A theoretical analysis is made for the lubrication of ball bearing retainers made of porous material. The results show that at low Sommerfeld reciprocals, the eccentricity ratio tends to unity with a high coefficient of friction. At a certain critical value of the reciprocal, a minimum friction occurs, thereafter followed by hydrodynamic operation. The critical value depends on the permeability parameter of the porous matrix and increases with its porosity. Experiments suggest that at low Sommerfeld reciprocals or with the oil supply coming only from the retainer pores, mixed film lubrication occurs, friction being less than that obtained theoretically. Such a lubrication regime would still allow sufficient oil to be carried by the balls to the races for their lubrication.

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