The Research of 2 Degrees of Freedom Vertical Vibration System Modeling for 4-High Hot Strip Mill Stands

2012 ◽  
Vol 472-475 ◽  
pp. 1759-1766
Author(s):  
Wei Jin Ma ◽  
Mi Rui Wang ◽  
Feng Lan Li ◽  
Jun Yuan Wang ◽  
Shi Bo Xiong
Keyword(s):  
Rolling Mill ◽  
Degrees Of Freedom ◽  
Research Result ◽  
Rolling Process ◽  
Vertical Vibration ◽  
Hot Strip Mill ◽  
Vibration System ◽  
Lumped Mass ◽  
Strip Rolling ◽  
Hot Strip

A lumped mass model with two degrees of freedom for the vertical vibration system of four roller hot strip rolling mill stand is proposed, and then the parameters of dynamic model , include the equivalent mass , equivalent stiffness and its natural frequencies, were calculated by MATLAB package. The correctness of the model is verified via field vibration testing and signal analysis in the strip rolling process. Comparative the six degrees freedom model, the two degrees freedom model of our proposed is simplified reasonability and the model accuracy is maintained certainly . The two degrees freedom model is critical for the research of digital simulation of the strip rolling process. The research result have important theoretical and practical significance for the parameter optimization of the AGC system , vertical vibration control, the product quality improvement and the rolling speed increase for the rolling mill system.

Research and Application on Spring Model of Hot Strip Mill

2012 ◽  
Vol 572 ◽  
pp. 61-66 ◽  
Author(s):  
Hai Yu Wang ◽  
Quan Yang ◽  
Xiao Chen Wang ◽  
Yan Zhang ◽  
De Fu Guo
Keyword(s):  
Rolling Mill ◽  
Rolling Process ◽  
Calculation Model ◽  
Hot Strip Mill ◽  
Spring Model ◽  
Strip Rolling ◽  
Finite Element Software ◽  
Hot Strip ◽  
Longitudinal Stiffness ◽  
Control Study

Spring model is important restrictive factors to improve the precision of AGC control system. To improve the accuracy of strip gauge control, Study on various influencing factors of spring model has important significance in rolling process. Therefore, using ABAQUS finite element software, this paper establishes the whole stand model of strip rolling. The model is used to analyze variation factors of the strip width and bending force to impact the longitudinal stiffness of rolling mill and get calculation model of the longitudinal stiffness of rolling mill. Then, this paper considers influence of the roller thermal expansion and wear factors influence on spring model and establish compensation model. The corrected spring model was applied to 1780mm hot strip mill in a factory in China, taking 45 strip head samples for measurement, with the model error under 50µm.

Research on Six DOF Vertical Vibration Model of a Four Roller Hot Strip Rolling Mill Stand

2011 ◽  
Vol 279 ◽  
pp. 301-306
Author(s):  
Wei Jin Ma ◽  
Jun Yuan Wang ◽  
Feng Lan Li ◽  
Zhi Qiang Zeng ◽  
Deng Hong Xiao ◽  
...  
Keyword(s):  
Rolling Mill ◽  
Vertical Vibration ◽  
Hot Strip Rolling ◽  
Lumped Mass ◽  
Strip Rolling ◽  
Hot Strip ◽  
Vibration Model ◽  
Excited Vibration ◽  
Mill Stand ◽  
Six Dof

A lumped mass model with six degrees of freedom for the vertical vibration of four roller hot strip rolling mill stand was proposed, while its natural frequencies were calculated by MATLAB software. The numerical calculation results were proved more accurate through field vibration test. This vertical vibration model can be applied for dynamic simulation and structural dynamic modification with important theoretical and practical significance in mastering the vibration characteristics of four-roll mill, avoiding vertical self-excited vibration and improving production efficiency.

Optimization of Short Stroke Control Curve in Hot Strip Mill by FEM Modelling

2009 ◽  
Vol 83-86 ◽  
pp. 106-112
Author(s):  
Xiao Zhong Du ◽  
Quan Yang ◽  
Cheng Lu ◽  
Hong Tao Zhu ◽  
A. Kiet Tieu
Keyword(s):  
Finite Element Method ◽  
Rolling Mill ◽  
Rolling Process ◽  
Hot Strip Mill ◽  
Head Part ◽  
The Finite Element Method ◽  
Control Curve ◽  
Hot Strip ◽  
Tail Part ◽  
Width Change

The slab edge rolling has been widely used in the roughing stand of hot strip mill to control the width of the slab. However, the slab edge rolling and consequent horizontal rolling will cause a significant width change in the head part and tail part of the slab, which have to be trimmed before the finishing stands. The short stroke control (SSC) technology has been developed to overcome this problem. In this paper, the finite element method (FEM) has been used to simulate the unsteady edge rolling process. Three SSC control curves have been compared in order to obtain the best width control result. The optimized SSC control curve has been applied to the industrial rolling mill.

Computational Model of Work Roll Temperature Distribution during Hot Strip Rolling Process

2012 ◽  
Vol 229-231 ◽  
pp. 2432-2435
Author(s):  
Xing Dong Li ◽  
Yan Xia Shan ◽  
Chang Hong Guo
Keyword(s):  
Computational Models ◽  
Work Roll ◽  
Rolling Process ◽  
Hot Strip Mill ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Roll Temperature ◽  
Hot Strip ◽  
Temperature Field Model ◽  
Deformation Work

Computational models of deformation and friction work were established by dividing contact arc between strip and work roll into two sliding regions, two braking regions and one stagnating region. A two dimensional temperature field model of work roll was established by finite difference method according to practical boundary conditions. Simulation results show that with the increase of rolling pass, deformation work reduced while friction work increased, except that deformation and friction works at the last pass were the least. The computed rolling forces and work roll surface temperatures agree well with measured values collected from a hot strip mill.

Vertical Vibration Characteristics Analysis of Stand Rolls System in Six-Roll Cold Tandem Mill

2013 ◽  
Vol 470 ◽  
pp. 572-576 ◽  
Author(s):  
Ying Zhang ◽  
Li Liu ◽  
Pei Ming Shi ◽  
Bin Liu
Keyword(s):  
Cold Rolling ◽  
Natural Frequency ◽  
Rolling Mill ◽  
Rolling Process ◽  
Vertical Vibration ◽  
Vibration System ◽  
Cold Rolling Mill ◽  
Third Order ◽  
The Third ◽  
Characteristics Analysis

A dynamic model of seven degree of freedom for the vertical vibration of stand rolls system in a cold tandem mill is developed by Kinematics Theory. According to the actual parameters of a factory six-roll cold rolling mill, the influence of natural frequency and modes for rolling process is analyzed. It finds that the third-order and the six-order natural frequency play a role key in vertical vibration system. Combined with energy distribution of each part and flexibility of the modes analysis for vertical vibration system, it can avoid resonance of rolling process and optimize the parameters of stand rolls system by adjusting structural size appropriately. The above mentioned results have provided a reference for further research on Kinematics and structural optimization of six-roll cold tandem mill.

Optimization of the Rollers System of Aluminum Strip Rolling Mill Based on the Stochastic Vibration

2010 ◽  
Vol 34-35 ◽  
pp. 544-550
Author(s):  
Bao Yu Xu ◽  
Yi Lun Liu ◽  
Xu Dong Wang ◽  
Fang Dong ◽  
Zhi Cheng Kang
Keyword(s):  
Mathematical Model ◽  
Natural Frequency ◽  
Dynamic Behavior ◽  
Rolling Mill ◽  
Vertical Vibration ◽  
Damping Coefficient ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Hot Strip ◽  
Roller System

The dynamic behavior of roller system of a "1+4" hot strip rolling tandem mill were analyzed. The stochastic vertical vibration and the optimum mathematical model were established based on the reliability after the system simplified to some extent. Stochastic optimum has been done to the system according to the optimum mathematical model of the roller system. Its best natural frequency and damping coefficient are obtained by computer simulation under the situation of minimum response of the rollers stationary acceleration when chatter occurs. The results indicate that by optimizing the natural frequency and damping coefficient of the system can greatly improve the dynamic behavior of rollers system and equality of the strip, and are useful to the new design of the rolling mill and the setting up of the rolling parameters.

Experimental Investigation Into Improved Wrapper Control of Hot Strip Steel Rolling Mill Downcoilers

2009 ◽  
Author(s):  
D. Ll. Davies ◽  
J. Watton ◽  
Y. Xue ◽  
G. A. Williams
Keyword(s):  
Rolling Mill ◽  
New Technologies ◽  
Position Control ◽  
Steel Production ◽  
Rolling Process ◽  
Steel Rolling ◽  
Hot Strip ◽  
Accurate Position ◽  
Manufacturing Techniques ◽  
Coiling Process

With increasing international competition in steel production mainly from developing nations, it is important for steel plants to keep up to date with new technologies, and continuously improve on current practices and manufacturing techniques to remain competitive. This paper looks specifically at improvements to the hot rolling mill downcoilers, which is where the strip is coiled at the end of the rolling process. Hydraulic and pneumatic technology is combined to give accurate position control of guide wrappers that aid the initial coiling process. The paper presents an experimental test rig, using an actual wrapper guide, constructed to evaluate the specific design approach.

The Study of Deformability of Heat-Resistant Alloy Named “Inconel Alloy 625” for Estimation of Plates Production Possibility at Wide-Strip Rolling “Mill 2300”

2019 ◽  
Vol 946 ◽  
pp. 818-822 ◽  
Author(s):  
Nikita S. Deryabin
Keyword(s):  
Mathematical Model ◽  
Rolling Mill ◽  
Cooling System ◽  
Rolling Process ◽  
Inconel 625 ◽  
Technological Parameters ◽  
Strip Rolling ◽  
Cracking Behavior ◽  
Inconel Alloy ◽  
Alloy 625

The hot deformation behavior of the Inconel alloy 625 was investigated through compression test within the temperature range of 850–1250 °C and the strain rate range of 0.1–30 s−1. Physically based mathematical model involving dynamic recovery and dynamic recrystallization processes has been proposed. Mathematical model allowed to calculate technological parameters of a rolling process of the “Inconel 625” at the hot rolling mill 2300. The pilot rolling operations showed that the possibility of the “Inconel 625” production exists. But it is necessary to provide the design changes of the cooling system of the work rolls. The article addressed the cracking behavior of nickel alloys in industries such as chemical process, nuclear generation, aircraft engine production.

Mathematical modelling of roll wear in a tandem mill hot strip rolling process

2013 ◽  
Vol 4 (1) ◽  
pp. 56
Author(s):  
Carlos Arturo Vega Lebrún ◽  
Rumualdo Servin Castañeda ◽  
Genoveva Rosano Ortega ◽  
Juan Manuel Lopez ◽  
José Luis Cendejas Valdéz ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Rolling Process ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Hot Strip ◽  
Roll Wear

Control Scheme Using Forward Slip for a Multi-stand Hot Strip Rolling Mill

2004 ◽  
Vol 18 (6) ◽  
pp. 972-978 ◽  
Author(s):  
Young Hoon Moon ◽  
I Seok Jo ◽  
Chester J. Van Tyne
Keyword(s):  
Rolling Mill ◽  
Forward Slip ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Hot Strip ◽  
Control Scheme
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