Research on Finishing Rolling Force Model for Hot Rolling Wide and Heavy Stainless Steel Clad Sheets

2014 ◽  
Vol 488-489 ◽  
pp. 213-216 ◽  
Author(s):  
Jin He Rong ◽  
Xiao Hong ◽  
Geng Yong Xiang ◽  
Jiang Jin Shui
Keyword(s):  
Stainless Steel ◽  
Relative Error ◽  
Hot Rolling ◽  
Rolling Force ◽  
Rolling Stock ◽  
Force Model ◽  
Mechanical Coupling ◽  
Hot Rolled ◽  
Force Calculation ◽  
Unit Pressure

In order to effectively improve the calculation accuracy of finishing rolling force model for hot rolling wide and heavy stainless steel clad sheets, based on the E.Orowan unit pressure equilibrium differential equations and R.B.Sims unit pressure formulas, this paper divides hot-rolled composite deformation area into I, II two zones according to rolling stock jamming experiment, and then derives the finishing rolling force calculation formulas. Finally, by ANSYS/LS-DYNA thermal mechanical coupling simulation and experiment, the results show that compared with measured values, the relative error of simulated values is about 20%, the relative error of calculated values is less than 10%. Therefore, the rolling force model can accurately predict the size of rolling force and effectively improve the calculation accuracy of rolling force.

scholarly journals Vibration Characteristics of Hot Rolling Mill Rolls Based on Elastoplastic Hysteretic Deformation

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 869
Author(s):  
Rongrong Peng ◽  
Xingzhong Zhang ◽  
Peiming Shi
Keyword(s):  
Hot Rolling ◽  
Internal Resonance ◽  
Rolling Mill ◽  
Rolling Force ◽  
Subharmonic Resonance ◽  
Force Model ◽  
Maximum Lyapunov Exponent ◽  
Vibration System ◽  
Hot Rolling Mill ◽  
Rolling Mill Vibration

Based on the analysis of the influence of roll vibration on the elastoplastic deformation state of a workpiece in a rolling process, a dynamic rolling force model with the hysteresis effect is established. Taking the rolling parameters of a 1780 mm hot rolling mill as an example, we analyzed the hysteresis between the dynamic rolling force and the roll vibration displacement by varying the rolling speed, roll radius, entry thickness, front tension, back tension, and strip width. Under the effect of the dynamic rolling force and considering the nonlinear effect between the backup and work rolls as well as the structural constraints on the rolling mill, a hysteretic nonlinear vertical vibration model of a four-high hot rolling mill was established. The amplitude-frequency equations corresponding to 1/2 subharmonic resonance and 1:1 internal resonance of the rolling mill rolls were obtained using a multi-scale approximation method. The amplitude-frequency characteristics of the rolling mill vibration system with different parameters were studied through a numerical simulation. The parametric stiffness and nonlinear stiffness corresponding to the dynamic rolling force were found to have a significant influence on the amplitude of the subharmonic resonance system, the bending degree of the vibration curve, and the size of the resonance region. Moreover, with the change in the parametric stiffness, the internal resonance exhibited an evident jump phenomenon. Finally, the chaotic characteristics of the rolling mill vibration system were studied, and the dynamic behavior of the vibration system was analyzed and verified using a bifurcation diagram, maximum Lyapunov exponent, phase trajectory, and Poincare section. Our research provides a theoretical reference for eliminating and suppressing the chatter in rolling mills subjected to an elastoplastic hysteresis deformation.

scholarly journals Research on rolling force model in hot-rolling process of aluminum alloys

2011 ◽  
Vol 16 ◽  
pp. 745-754 ◽  
Author(s):  
Huang Changqing ◽  
Deng Hua ◽  
Chen Jie ◽  
H.U Xinghua ◽  
Yang Shuangcheng
Keyword(s):  
Aluminum Alloys ◽  
Hot Rolling ◽  
Rolling Force ◽  
Rolling Process ◽  
Force Model ◽  
Hot Rolling Process

Modeling the Temperature/Force Phenomena of an Extra-Low Carbon Steel in Two-Phase Hot Rolling

1999 ◽  
Author(s):  
Yhu-Jen Hwu ◽  
Chang-Huei Wu
Keyword(s):  
Carbon Steel ◽  
Hot Rolling ◽  
Rolling Force ◽  
Low Carbon Steel ◽  
Phase Transformation Temperature ◽  
Force Model ◽  
Low Carbon ◽  
Two Phase ◽  
Finishing Mill ◽  
Temperature Force

Abstract Extra-low carbon steel had been rolled in conventional hot rolling mill. For improving its mechanical and metallurgical properties, its high phase transformation temperature typically encountered in the finishing mill section that results in abrupt change of flow stress and consequently the rolling force. A simple temperature/force model is proposed to predict the strip temperature and mill loading force to achieve better understanding of complicated phenomena encountered in the field and also for future initial rolling condition setup. Preliminary results based on the model are satisfactorily close to the on-line rolling data from the seven-stand mill of China Steel Corporation.

Study on Vertical-Horizontal Coupling Vibration of Mill Rolls Based on the Nonlinear Rolling Force Model

2013 ◽  
Vol 385-386 ◽  
pp. 101-104
Author(s):  
Dong Xiao Hou ◽  
Rong Rong Peng ◽  
Hao Ran Liu ◽  
Ye Chi Wang
Keyword(s):  
Rolling Mill ◽  
Rolling Force ◽  
Multiple Scale ◽  
Force Model ◽  
Approximation Solution ◽  
Coupling Vibration ◽  
Scale Method ◽  
Coupling System ◽  
Nonlinear Rolling ◽  
Unit Pressure

Based on the Orowan unit pressure differential equation, a vertical-horizontal dynamic rolling force model of workpiece was studied. Then, considering the influence of the rolling mill structure, the vertical-horizontal coupling vibration dynamic model of mill rollers was estabilished. The parse approximation solution of coupling system were carried out by using multiple-scale method, and the equations of amplitude frequency were obtained. Finally, the computer simulation analzed the characteristics of the system in different parameters, which can supply theoretical bases for suppressing vibration of rolling mill.

Bright Line Defects of Hot Rolled Plate for 2205 Duplex Stainless Steel

2013 ◽  
Vol 470 ◽  
pp. 15-18
Author(s):  
Hui Zhang ◽  
Yong Jun Zhang ◽  
Jing Tao Han ◽  
Yuan Dong ◽  
Jie Ren Hu
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Hot Rolling ◽  
Rolling Process ◽  
Rolled Plate ◽  
Strip Surface ◽  
2205 Duplex Stainless Steel ◽  
Bright Line ◽  
Line Defects ◽  
Hot Rolled

In hot rolling process of 2205 duplex stainless steel, it was found that bright line defects are mainly located at where is about distance of 200 mm from two sides of hot rolled plate. The forming reason of bright line defects is studied by means of metallographic microscope, scanning electron microscope (SEM) combined with energy dispersive spectrometer (EDS). It is concluded that the formation of bright line defects has associated with sticking and that the temperature reduction on the edge of hot rolling plate causes a high percentage of austenite phase which is network structure. In order to prevent or avoid the happening of the sticking phenomenon, it is necessary to uniformly distribute the oxide on the strip surface by controlled rolling process.

Analysis of Microstructures and XRD of a Gradient Boron Alloyed Composite Material

2013 ◽  
Vol 680 ◽  
pp. 113-118
Author(s):  
Guo Liang Xie ◽  
Qiang Song Wang ◽  
Xu Jun Mi ◽  
Bai Qing Xiong ◽  
Jing Tao Han ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Hot Rolling ◽  
Rolling Process ◽  
The Core ◽  
The Matrix ◽  
New Type ◽  
And Performance ◽  
Hot Rolled ◽  
Stainless Steel Coatings

A new type of gradient boron alloyed composite material, containing boron alloyed core layers and stainless steel coatings around the core, were designed and prepared by composite casting and hot rolling. The evolution of microstructures, phases and precipitations, as well as their influence on hot rolling process and performance are investigated. A mixture of austenitic matrix and uniformly distributed borides are obtained in the hot rolled stainless steel with 2-2.5 % boron, while massive borides are in the length of 80-120 μm together with micro gaps at the interface between the borides, and the matrix is remained after hot rolling for the core layers with higher boron contents. Hot deformation would be hindered since more precipitations of these orthorhombic or tetragonal phases occur with an increase of the boron concentration in the core layers.

Rolling Force Calculation for Strip Cold Rolling Based on Influence Function Method

2014 ◽  
Vol 633-634 ◽  
pp. 791-794 ◽  
Author(s):  
Hai Zhou ◽  
Jin Lan Bai
Keyword(s):  
Cold Rolling ◽  
Influence Function ◽  
Function Method ◽  
Rolling Force ◽  
Force Model ◽  
Strip Rolling ◽  
Influence Function Method ◽  
Roll Flattening ◽  
Calculation Results ◽  
Force Calculation

The rolling force calculation procedure of strip cold rolling is developed based on influence function method, with consideration of the couple of roll flattening model and rolling force model. With the procedure total rolling force and the distribution of rolling force per width of each pass for HC mill are calculated using sampling data obtained from actual strip rolling. Comparing the calculation results with actual measured value, it is shown that the calculated total rolling forces are similar to actual data, and the distribution of rolling force per width is consistent with the actual status. It proved that the calculation method introduced in this paper is an effective method to calculate rolling force, and it can be used in the process control of strip cold rolling mill.

Study of Rolling Force Calculation Models for Cold Rolling Process

2010 ◽  
Vol 154-155 ◽  
pp. 882-885
Author(s):  
Zhi Jie Jiao ◽  
Chun Yu He ◽  
Jian Ping Li ◽  
Xiang Hua Liu
Keyword(s):  
Friction Coefficient ◽  
Cold Rolling ◽  
Rolling Force ◽  
Rolling Process ◽  
Calculation Model ◽  
Deformation Resistance ◽  
Force Model ◽  
Practical Application ◽  
Hill Model ◽  
Force Calculation

For cold rolling process, the theoretical Bland-Ford-Hill model and Hitchcock model are used for the rolling force and roll flatten radius calculation. Friction coefficient and deformation resistance are calculated with empirical regression models. From rolling force model, the recalculation model for the friction coefficient and deformation resistance can be derived. After rolling, with actual measured data, friction coefficient and deformation resistance can be recalculated, and model parameter can be got by regression method. The practical application verifies that the accuracy of rolling force calculation model is good.

Precise Rolling Force Calculation for the Tandem Cold Mill

2007 ◽  
Vol 561-565 ◽  
pp. 1883-1886
Author(s):  
Zhi Jie Jiao ◽  
Hao Zhang ◽  
Jing Wang ◽  
Chui Hong Liu ◽  
Xiang Hua Liu
Keyword(s):  
Rolling Force ◽  
Steel Grade ◽  
Rolling Speed ◽  
Force Model ◽  
Technical Parameter ◽  
Calculation Process ◽  
Tandem Cold Mill ◽  
Force Calculation ◽  
Online Process ◽  
Cold Mill

Rolling force is the most important technical parameter for the tandem cold mill. In this paper, the precise models and calculation process for the rolling force are introduced. The rolling force model is based on the Bland-Ford and Hill theory, and the roll flatten radius is calculated with the Hitchcok’s formula. The deformation resistance of the strip is calculated with the model, whose parameters are decided according to the steel grade. The friction coefficient model is built according to rolling speed and rolled length of the roll. The rolling force and the roll flatten radius are calculated with the iterative method. These models are used for online process control of one five-stand tandem cold mill. Comparing the calculation result and the actual data, the precision of the rolling force calculation is high.

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