Lateral Distribution of Pressure in Thin Strip Rolling

1970 ◽  
Vol 92 (2) ◽  
pp. 453-459 ◽  
Author(s):  
H. A. Kuhn ◽  
A. S. Weinstein
Keyword(s):  
Rolling Force ◽  
Contact Region ◽  
Three Dimensional ◽  
Work Roll ◽  
Lateral Distribution ◽  
Thin Strip ◽  
Strip Rolling ◽  
Edge Contact ◽  
Strip Shape

A method is presented for the determination of the lateral distribution of pressure in thin strip rolling. A simplified three-dimensional analysis of elastic deformation of the rolls is developed for use in the method. Pressure in the roll edge contact regions (in underface rolling), as well as in the roll-strip contact region, is considered. In the case of four-high, planetary, and Sendzimir-type mills, the lateral distribution of pressure between the work roll and backup rolls is also found. Calculated results indicate lateral pressure distributions which have peak values at each edge of the strip with a minimum at the center. The degree of this nonuniformity depends on roll geometry and configuration. Partition of the total rolling force between roll-strip contact and roll edge contact in underface rolling is also determined. Since interroll heat transfer is dependent on contact area, and hence, pressure, the results can also aid the determination of lateral temperature distributions in the rolls. In addition, the method is potentially useful for a study of the influence of roll geometry and configuration on strip shape.

scholarly journals Thin Strip Profile Control Capability of Roll Crossing and Shifting in Cold Rolling Mill

2013 ◽  
Vol 773-774 ◽  
pp. 70-78 ◽  
Author(s):  
Abdulrahman Aljabri ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei ◽  
Xiao Dong Wang ◽  
Hasan Tibar
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Rolling Force ◽  
Work Roll ◽  
Rolling Process ◽  
Thin Strip ◽  
Strip Rolling ◽  
Strip Shape ◽  
Strip Profile ◽  
Profile Control

Controlling cold strip profile is a difficult and significant problem has been found in industry during thin strip rolling. At present choosing the new type of strip rolling mill is the one of main methods to control the strip shape quality in cold rolling. The influences of rolling process parameters such as the work roll cross angle and work roll shifting on the strip shape and profile of thin strip are recognised throughout this study. The results show that the roll crossing and shifting is efficient way to control the strip shape. The increase of the work roll crossing angle would lead to improve the strip profile significantly by decreasing the exit strip crown and edge drop. The strip profile would be enhanced if the axial roll shifting was increased. Moreover, the total rolling force was analysed in detail by changing the roll cross angle and axial shifting roll.

scholarly journals Improving Thin Strip Profile Using Work Roll Cross and Work Roll Shifting Methods in Cold Strip Rolling

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Hasan Tibar ◽  
Zhengyi Jiang
Keyword(s):  
Rolling Force ◽  
Work Roll ◽  
Strip Width ◽  
Thin Strip ◽  
Speed Ratio ◽  
Strip Rolling ◽  
Strip Shape ◽  
Strip Profile ◽  
Work Roll Shifting ◽  
Work Rolls

The optimization of rolling parameters in order to achieve better strip shape and to reduce rolling force is a challenge in rolling practice. In this paper, thin strip asymmetrical rolling of aluminum at various speed ratios under lubricated condition has been investigated at various combinations of work rolls cross (WRC) angles and work rolls shifting (WRS) values. The effects of strip width, reduction, and rolling speed on strip shape taking WRC and WRS into consideration are discussed. Results show that strip profile improves significantly when the WRC angle is increased from 0° to 1°, with an associated reduction in rolling force. Increasing WRS value from 0 to 8 mm improves the strip profile as well but not as significantly as when WRC angle is increased. No significant improvement was found in strip shape when the strip width was increased. At higher reduction, the strip shape was improved; a decrease in the rolling force was also observed. A higher speed ratio was found to be effective only at a higher WRC angle. The effect of lubrication on the strip profile was significant. Results indicate that an optimum combination of WRC, WRS, reduction, width, and speed ratio under lubricated conditions can ensure an improved exit strip profile, reduce rolling force, and obtain a better quality strip.

The Minimum Gauge Problem in Thin Strip Rolling

1971 ◽  
Vol 93 (3) ◽  
pp. 331-340 ◽  
Author(s):  
H. A. Kuhn ◽  
A. S. Weinstein
Keyword(s):  
Sliding Friction ◽  
Contact Region ◽  
Three Dimensional ◽  
Thin Strip ◽  
Theoretical Treatment ◽  
Plastic Yielding ◽  
Strip Rolling ◽  
Basic Assumptions ◽  
Traction Distribution

All previous analyses of the minimum gauge problem either fail to arrive at a criterion for determination of the minimum gauge or result in predictions which are grossly in error. The basic assumptions utilized in these analyses are investigated in the present work with a view toward improving the existing theories. Those assumptions whose validity appears questionable are considered in detail through appropriate analysis. In particular, these assumptions are: (i) the strip and rolls deform uniformly across the width of the strip; (ii) Coulomb (sliding) friction occurs between the rolls and strip. Theoretical treatment of the complex three-dimensional behavior of the rolls and strip is made tenable through simplifications to suitable two-dimensional problems. The primary result of the investigation indicates that the assumption of sliding friction is completely without justification in rolling at the limiting conditions. A new shear traction distribution is postulated which is consistent with the fundamental laws of friction and results in sticking friction (zero slip) over most of the contact region. Incorporating this shear distribution, limiting rolling conditions can be shown to exist theoretically and the minimum gauge can be predicted. It is also found that the Poisson’s ratio must be one-half in the regions of incipient plastic yielding in the strip if a minimum gauge is to be predicted.

Modelling of work roll edge contact in thin strip rolling

2004 ◽  
Vol 155-156 ◽  
pp. 1280-1285 ◽  
Author(s):  
Z.Y. Jiang ◽  
H.T. Zhu ◽  
A.K. Tieu ◽  
W.H. Sun
Keyword(s):  
Work Roll ◽  
Thin Strip ◽  
Strip Rolling ◽  
Edge Contact

Mechanics of Asymmetric Rolling of Thin Strip with Effect of Work Roll Edge Contact

2007 ◽  
Vol 561-565 ◽  
pp. 115-118
Author(s):  
Zheng Yi Jiang ◽  
Hai Bo Xie ◽  
L.M. Yang ◽  
Hong Tao Zhu ◽  
Dong Bin Wei ◽  
...  
Keyword(s):  
Rolling Force ◽  
Work Roll ◽  
Contact Length ◽  
Thin Strip ◽  
Asymmetric Rolling ◽  
Edge Contact ◽  
Roll Bending ◽  
Work Rolls ◽  
Strip Crown ◽  
Small Work

Asymmetric rolling of thin strip has become important due to a significant decrease of rolling force, which contributes to obtain the extremely thin strip, to reduce the rolling passes, and to save the energy by a decrease of anneal treatment. In asymmetric rolling of thin strip, edges of work rolls may contact and deform when no or small work roll bending force is applied. Work roll edge contact forms a new deformation feature. In this paper, the effects of initial thickness of strip and friction coefficient on the rolling pressure, roll edge contact length and strip crown during asymmetric rolling of thin strip with work roll edge contact effect has been discussed, and the calculated rolling force with work roll edge contact is compared with the measured value.

Shape and Flatness in Thin Strip Rolling

1972 ◽  
Vol 94 (4) ◽  
pp. 1113-1123 ◽  
Author(s):  
H. W. O’Connor ◽  
A. S. Weinstein
Keyword(s):  
Mathematical Model ◽  
Work Roll ◽  
Thin Strip ◽  
Test Results ◽  
Considerable Influence ◽  
Strip Rolling ◽  
Roll Bending ◽  
Strip Shape ◽  
Mill Stand ◽  
The Mathematical Model

The paper describes measurements of lateral flow of material which took place during cold rolling thin strip. This sideways flow is shown to have a considerable influence of the final flatness of the strip. A mathematical model of a rolling mill stand is described, which includes a calculation allowing for sideways flow of material. Parameter studies are made using the mathematical model, which show the influence of crowns, tensions, back-up and work roll bending on the resultant strip shape. A comparison is made between results predicted by the model and test results obtained on a production mill.

Mechanics of a Special Asymmetric Rolling of Thin Strip

2007 ◽  
Vol 340-341 ◽  
pp. 707-712 ◽  
Author(s):  
Zheng Yi Jiang ◽  
Hong Tao Zhu ◽  
Dong Bin Wei ◽  
A. Kiet Tieu
Keyword(s):  
Rolling Mill ◽  
Rolling Force ◽  
Work Roll ◽  
Contact Length ◽  
Thin Strip ◽  
Rolled Strip ◽  
Initial Thickness ◽  
Asymmetric Rolling ◽  
Edge Contact ◽  
Work Rolls

Asymmetric rolling is used to produce thinner strip, which can reduce rolling force significantly. When a thinner strip is rolled on a rolling mill, work roll edge may contact each other, which affects the mechanics of this special asymmetric rolling and the crown of the rolled strip. In this paper, the authors developed a numerical model to simulate this special rolling and obtained the rolling force, intermediate force, roll edge contact force, the crown of the rolled strip and the edge contact length. The effects of the initial thickness of strip and the friction variation at upper and lower work rolls on the rolling force and crown of the rolled strip are also discussed.

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