A Study of Cold Strip Rolling

1979 ◽  
Vol 101 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Arvind Atreya ◽  
John G. Lenard
Keyword(s):  
Exact Solution ◽  
Two Dimensional ◽  
Strip Rolling ◽  
Roll Pressure ◽  
Present Technique ◽  
Dimensional Finite Element ◽  
Accurate Comparison ◽  
Roll Deformation ◽  
Cold Strip Rolling ◽  
Roll Shape

The effect of roll deformation on separating forces in cold strip rolling is studied. The deformed roll shape is determined by a two dimensional finite element routine. The results are then incorporated in an analysis of the mechanics of rolling. The technique consists of assembling individual slabs bounded by planes passing through nodal points on the arc of contact—for each of which an exact solution for the roll pressure is obtained. Comparison to the solution of Orowan’s equations shows that the present technique is reasonably accurate. Comparison to data from a preliminary set of experiments shows that the technique deserves further investigation.

Hydrodynamic Model for Cold Strip Rolling

1967 ◽  
Vol 182 (1) ◽  
pp. 153-162 ◽  
Author(s):  
D. S. Bedi ◽  
M. J. Hillier
Keyword(s):  
Friction Coefficient ◽  
Film Thickness ◽  
Entropy Production ◽  
Coefficient Of Friction ◽  
Hydrodynamic Model ◽  
Reynolds Equation ◽  
Viscous Friction ◽  
Strip Rolling ◽  
Roll Pressure ◽  
Cold Strip Rolling

The theory of rolling is modified to allow calculation of a hydrodynamic film thickness and viscous friction coefficient using Reynolds equation for the lubricant. Calculations are made for the case where the fluid film covers the arc of contact. The film thickness is assumed uniform and is determined by the principle of minimum rate of entropy production. It is shown that the apparent coefficient of friction varies significantly over the arc of contact. At small reductions the roll load tends to decrease with speed of rolling, while at high reductions the load tends to increase. The point of maximum roll pressure does not coincide with the neutral plane; and under certain rolling conditions there may be no maximum in the pressure over the arc of contact.

Two-Dimensional Roll Bite Model with Lubrication for Cold Strip Rolling

2014 ◽  
Vol 966-967 ◽  
pp. 48-62 ◽  
Author(s):  
Talib Dbouk ◽  
Pierre Montmitonnet ◽  
Nicolas Legrand
Keyword(s):  
Mixed Lubrication ◽  
Test Cases ◽  
Slab Method ◽  
Strip Rolling ◽  
Micro Fluidics ◽  
Lubricant Flow ◽  
New Type ◽  
Roll Deformation ◽  
Cold Strip Rolling ◽  
Roll Bite

To help optimize cold rolling operations, mixed lubrication models have been developed and embedded in roll bite models. The resulting models combine micro-fluidics in a porous medium (the lubricant flow between the contacting rough surfaces), microplasticity (roughness flattening / scratching), macro-plasticity (strip reduction) and roll thermo-elasticity. They are therefore really complex and need a lot of physical data. Based on previous developments, a new, simpler version of our lubrication model has been coupled with a new roll bite model recently presented: slab method for the strip elastic-plastic deformation (Prandtl-Reuss equations), a complete influence functions set for the roll deformation with circumferential displacements, and an efficient, adaptive relaxation technique when iterating between roll and strip models. The lubrication model is elaborated on Wilson and Sheu’s mixed lubrication model. The paper describes the implementation and compares its results with our previous, more complex version; a reasonable agreement is found. Several test cases of increasing difficulty show the robustness of the model and of its implementation. As a conclusion, a brief perspective is provided on how this new type of roll bite model could be used in industry.

Study of Friction in Cold Strip Rolling

1984 ◽  
Vol 106 (2) ◽  
pp. 139-146 ◽  
Author(s):  
Lim Lai-Seng ◽  
J. G. Lenard
Keyword(s):  
Aluminum Alloys ◽  
Coefficient Of Friction ◽  
Strip Rolling ◽  
Roll Pressure ◽  
Average Coefficient ◽  
The Coefficient Of Friction ◽  
Frictional Coefficients ◽  
Roll Gap ◽  
Cold Strip Rolling

Experiments were conducted to measure the effects of roll pressure and roll rpm on the magnitude and variation of the coefficient of friction in the roll gap in cold strip rolling. Two aluminum alloys (1100-T0 and 5052-H34) were used in the experiments. Roll pressures were found not to affect the frictional coefficients in a significant manner. Speed of rolling was identified as the most important parameter as far as the values of μ are concerned. Increased speeds appeared to lower the values of the average coefficient of friction.

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