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.

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.

The Mathematical Models and Simulation on Work Roll Bending Control System of Cold Rolling Mill

2014 ◽  
Vol 556-562 ◽  
pp. 2337-2341
Author(s):  
Yan Ping Wang ◽  
Xin Bing Yang ◽  
Yao Hui Jin ◽  
Bao Quan Liu ◽  
Jun Sheng Wang
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Influence Function ◽  
Rolling Mill ◽  
Work Roll ◽  
Cold Rolling Mill ◽  
Roll Bending ◽  
Simulation Results ◽  
Equivalent Load ◽  
The Mathematical Model

The calculated result of the mathematical model based on the conventional transfer function has bigger deviation than the measured. In this paper the mathematical model of the work roll bending is derived. The modeling is different from conventional modeling used many presumptions and linear processing. The modeling calculated accurately the equivalent load spring using the method of influence function. The simulation results agree well with actual data of the bending system.

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.

Improvement of Work Roll Bending Control System Installed at Plate Mill Stand

2017 ◽  
Author(s):  
Vadim R. Gasyarov ◽  
Andrey A. Radionov ◽  
Boris M. Loginov ◽  
Stanislav S. Voronin ◽  
Vadim R. Khramshin
Keyword(s):  
Control System ◽  
Work Roll ◽  
Plate Mill ◽  
Roll Bending ◽  
Mill Stand

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

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.

FPGA-Based Design of P-Detection 1-Persistent CSMA Control System

2014 ◽  
Vol 602-605 ◽  
pp. 933-936 ◽  
Author(s):  
Zheng Gang Liu ◽  
Hong Wei Ding ◽  
Jia Long Xiong ◽  
Qian Lin Liu ◽  
Xiao Hui Ma
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
System Performance ◽  
Communication Protocol ◽  
Test Results ◽  
Fpga Design ◽  
Simulation Results ◽  
Communication Control ◽  
The Mathematical Model ◽  
Waveform Simulation

In this paper, we propose P-detection and 1-Persistent CSMA/CA protocol. Using average cycle method, we established the mathematical model of the protocol. Through derivation, we obtain the throughput expression of this protocol. Simulation results show that this protocol improves the throughput and it is effective to enhance the system performance. Using this protocol, we completed the FPGA design of communication control system in WSN. The product passed waveform simulation and it is downloaded to the DB2 platform. Test results confirm the throughput of system has been increased, achieving the improvement of communication protocol for WSN.

scholarly journals Investigation on Direct Shear and Energy Dissipation Characteristics of Iron Tailings Powder Reinforced by Polypropylene Fiber

2019 ◽  
Vol 9 (23) ◽  
pp. 5098 ◽  
Author(s):  
Jiang ◽  
Lv ◽  
Wang ◽  
Li ◽  
Wang
Keyword(s):  
Mathematical Model ◽  
Energy Dissipation ◽  
Back Propagation ◽  
Polypropylene Fiber ◽  
Interfacial Strength ◽  
Distribution Model ◽  
Direct Shear ◽  
Test Results ◽  
Effective Measure ◽  
The Mathematical Model

Resource utilization of iron tailings powder is an effective measure to reduce the dam-break risk of an iron tailings reservoir. Adding polypropylene fiber to iron tailings powder can improve its shear performance. Direct shear tests were carried out on reinforced iron tailings powder with polypropylene fiber with dosages of 0%, 0.25%, 0.5%, 0.75%, and 1%, respectively. The normal stresses during the tests were 100, 200, 300, and 400 kPa, respectively. The test results show that with the increase of polypropylene fiber dosage, the cohesive force of iron tailings powder firstly increases and then decreases gradually, and the internal friction angle firstly decreases and then increases. The back propagation (BP)neural network was used to fit the shear force (F) and shear displacement (s) of the test to obtain the F-s function relationship that satisfies the accuracy. Based on the energy dissipation theory, the direct shear energy dissipation of polypropylene-fiber-reinforced iron tailings powder was calculated. The mathematical model of energy dissipation of fiber interfacial failure was derived by the fiber distribution model. The interfacial strength parameters of polypropylene fiber were calculated based on the direct shear test data and the mathematical model of fiber interfacial energy dissipation. The test results show that the addition of polypropylene fiber from the perspective of energy dissipation can improve the shear properties of iron tailings powder.

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