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.

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.

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.

Analysis of Thin Strip Shape and Profile in Cold Rolling: A Way to Improve Strip Profile and Mechanical Properties

2016 ◽  
Vol 879 ◽  
pp. 849-854 ◽  
Author(s):  
H.B. Tibar ◽  
Zheng Yi Jiang
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Low Carbon Steel ◽  
Physical And Mechanical Properties ◽  
Work Roll ◽  
Thin Strip ◽  
Speed Ratio ◽  
Low Carbon ◽  
Strip Profile ◽  
Work Roll Shifting

Optimisation of the physical and mechanical properties of cold rolled thin strips is achieved by controlling the rolling parameters. In this paper, the factors affecting the low carbon steel thin strip profile of asymmetrical cold rolling have been studied at a speed ratio of 1.3 without lubricant applied. The effect of rolling parameters on the resulting microstructure was also investigated. It was found that under dry condition, work roll shifting and work roll cross angle can improve the strip profile, and the improvement is more significant with an increase of work roll cross angle rather than that of work roll shifting. A slight change in microstructure was evident with increasing work roll shifting values. In addition, effects of rolling parameters on the strip profile and microstructure have also been discussed.

scholarly journals Analysis of thin strip profile by work roll crossing and shifting in asymmetrical cold rolling

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540032 ◽  
Author(s):  
Abdulrahman Aljabri ◽  
Zhengyi Jiang ◽  
Dongbin Wei
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Rolling Force ◽  
Work Roll ◽  
Thin Strip ◽  
Asymmetrical Rolling ◽  
Strip Profile ◽  
Work Rolls

In order to analyze the effects of cold rolling parameters such as the crossing angle and axial shifting value of work rolls on the strip profile, extensive tests were carried out on a 4-high rolling mill equipped with a work roll crossing and shifting system. The results show that the strip profile is nearly flat under asymmetrical rolling. The rolling force was also analyzed in detail by changing the crossing angle and axial shifting value of work rolls.

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.

scholarly journals Analysis of Thin Strip Profile during Asymmetrical Cold Rolling with Roll Crossing and Shifting Mill

2014 ◽  
Vol 894 ◽  
pp. 212-216 ◽  
Author(s):  
Abdulrahman Aljabri ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei
Keyword(s):  
Cold Rolling ◽  
Shape Control ◽  
Work Roll ◽  
Rolling Process ◽  
Thin Strip ◽  
Asymmetrical Rolling ◽  
Strip Shape ◽  
Strip Profile ◽  
Profile Control ◽  
The One

Strip profile control during rolling is required to assure the dimensional quality of rolled thin strip is acceptable for customers. Throughout rolling, the strip profile is controlled by using the advanced shape control rolling mill, such as the combination of work roll crossing and shifting during asymmetrical rolling, the one of the valuable methods to control the strip profile quality in rolling process. In this paper, the influences of cold rolling parameters such as the crossing angle and axial shifting value of work rolls on the strip profile are analysed. The strip shape control is discussed under both symmetrical and asymmetrical rolling conditions. The obtained results are appropriate to control the rolled thin strip profile in practice.

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.

Modelling of Strip Shape and Profile during Cold Rolling of Ultra Thin Strip

2012 ◽  
Vol 706-709 ◽  
pp. 1421-1426
Author(s):  
Zheng Yi Jiang ◽  
Xiao Wei Cheng ◽  
Xiao Zhong Du ◽  
Dong Bin Wei ◽  
Xiao Feng He
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Thickness Distribution ◽  
Element Model ◽  
Work Roll ◽  
Thin Strip ◽  
Asymmetrical Rolling ◽  
Strip Shape ◽  
Experimental Values ◽  
Edge Drop

In this paper, finite element models of the strip shape during cold rolling of ultra thin strip in both symmetrical and asymmetrical rolling cases have been successfully developed, and the strip shape such as the thickness distribution along the strip width has been obtained. The strip shape and edge drop are discussed under both symmetrical and asymmetrical rolling conditions. Simulation results show that the asymmetrical rolling can reduce strip edge drop dramatically. The work roll edge curve also affects strip shape significantly. The developed finite element model has been verified with the experimental values.

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
Sign in / Sign up

Export Citation Format

Share Document