scholarly journals The Work Roll Bending Control System of the Hot Plate Rolling Mill

2015 ◽  
Vol 129 ◽  
pp. 37-41 ◽  
Author(s):  
E.A. Maklakova ◽  
A.S. Maklakov ◽  
V.R. Gasiyarov ◽  
S.S. Voronin
Keyword(s):  
Control System ◽  
Rolling Mill ◽  
Work Roll ◽  
Hot Plate ◽  
Plate Rolling ◽  
Roll Bending

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.

Flatness Feed-Forward Control Model Based on Neural Networks

2014 ◽  
Vol 989-994 ◽  
pp. 3386-3389
Author(s):  
Zhu Wen Yan ◽  
Hen An Bu ◽  
Dian Hua Zhang ◽  
Jie Sun
Keyword(s):  
Neural Networks ◽  
Rolling Mill ◽  
Rolling Force ◽  
Work Roll ◽  
Control Model ◽  
Good Effect ◽  
Feed Forward ◽  
Force Fluctuations ◽  
Feed Forward Control ◽  
Roll Bending

The influence on the shape of the strip from rolling force fluctuations has been analyzed. The combination of intermediate roll bending and work roll bending has been adopted. The principle of rolling force feed-forward control has been analyzed. The feed-forward control model has been established on the basis of neural networks. The model has been successfully applied to a rolling mill and a good effect has been achieved.

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

Technical Characteristics and Application for a New Type of 8-Roll Cold Rolling Mill

2012 ◽  
Vol 572 ◽  
pp. 55-60 ◽  
Author(s):  
Peng Liu ◽  
Hong Bo Li ◽  
Zhi Qian Shen
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Work Roll ◽  
Fast Response ◽  
Cold Rolling Mill ◽  
Strip Flatness ◽  
Roll Bending ◽  
Roll Mill ◽  
Flatness Control ◽  
New Type

This paper focuses on a new type of 8-roll cold rolling mill with the back-up bearing roll. Compared to the traditional 6-roll cold rolling mill, a thick-walled bearing roll is used to multi-support the intermediate roll. By the rack, the fan-shaped gears, the eccentric core shaft and the servo-cylinder, the work roll can be pushed down by this screw down device on the top of the mill; By contrast with the 4(6)-roll mill, this type of mill has some characteristics, such as: the small size of rolls, lighter weight, the fast response for the screw down. The bearing roll is fixed by the supporting blocks placed on the rolling-mill housing. So this mill has large traverse rigidity, and this is propitious to the flatness control. By different means of strip flatness adjustments, such as the intermediate roll shifting, the roll bending and the bearing roll adjusting, the strip flatness can be well controlled. The oil-gas lubrication is used in the bearings of the bearing rolls, and the changing rolls equipment is designed for this type of mill too. A series of this type of mills (as 450, 800, 1250, 1450 series) have been produced since it was developed in 1997. The mills for 1250 and 1450 series have been applied in five-stand cold rolling mill and single stand reversing mill, a rolling speed of 800m/min has been achieved.

H∞ control system for a four-high stand rolling mill

2000 ◽  
Vol 214 (2) ◽  
pp. 79-86
Author(s):  
G G Lisini ◽  
P Toni ◽  
M C Valigi
Keyword(s):  
Control System ◽  
Rolling Mill ◽  
Multiple Input Multiple Output ◽  
Speed Control ◽  
Work Roll ◽  
Quality Level ◽  
Single Input Single Output ◽  
Revolution Speed ◽  
Single Output ◽  
Speed Control System

In steelworks the demand for a higher product quality level has improved the rolling mill process by means of a proper work roll speed control system. Firstly this paper proposes a lumped-parameter hot-rolling mill model. The rolling mill examined is reversible and equipped with an independent speed control system for each work roll (two single-input single-output systems). Therefore, the same revolution speed, essential for a high-quality process, can only be ensured by equal set point values. Nevertheless, during the process, different disturbance load torques cause speed differences and, even if they are not noticeable, rolled section defects cannot be avoided. The second part of the paper shows that it is possible to design a proper H∞ controller, to change the two independent control systems into a more complex multiple-input multiple-output system that will obtain decidedly better performances. Simulation examples have shown improvements.

scholarly journals Development of an Automatic Elastic Torque Control System Based on a Two-Mass Electric Drive Coordinate Observer

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 305
Author(s):  
Andrey A. Radionov ◽  
Alexandr S. Karandaev ◽  
Vadim R. Gasiyarov ◽  
Boris M. Loginov ◽  
Ekaterina A. Gartlib
Keyword(s):  
Control System ◽  
Literature Review ◽  
Control Systems ◽  
Electric Drive ◽  
Rolling Mill ◽  
A Priori ◽  
Torque Control ◽  
Mass System ◽  
Loop Control ◽  
Plate Rolling

Development of control system based on digital twins of physical processes is a promising area of research in the rolling industry. Closed-loop control systems are developed to control the coordinates of two-mass electromechanical systems in order to limit the dynamic loads on the equipment of main rolling lines. These control systems are based on observers (digital shadows) that indirectly detect (reconstruct) the roll speed and the elastic torque of the shaft (spindle) in real time. Notably, observers are required to work fast in order to reconstruct transients attributable to shock (impact) loads. Literature review shows that the known observers, which use complex algorithms to compute coordinates, do not respond fast enough. The paper analyzes the kinematic diagram of Mill 5000, a plate rolling mill. It presents oscillograms that prove that the elastic torque does oscillate as the rolls grip the strip dynamically. The authors hereof have developed an observer that reconstructs the coordinates of the uncontrolled mass (the shaft) and the spindle torque from the parameters of the controlled mass, namely the torque and speed of the motor. The paper further rationalizes an approach that consists of simulating the processes on a model to further directly configure them on the object. The authors analyze the transients of the reconstructed two-mass system coordinates, which are associated with the rolls gripping the strip. The paper compares data against oscillograms recorded on the mill itself. The accuracy is satisfactory. The proposed observer has been used to developed a three-loop automatic speed control system for the uncontrolled mass. Controller configurations are substantiated. The paper shows coordinates obtained by simulation modeling as functions of time. It further presents experiments run on Mill 5000; the conclusions are that the amplitude and oscillations of the elastic torque drop significantly. The paper concludes with recommendations on industrial adoption of the observer and the novel electric drive coordinate control system. Study presented herein substantiates and implements a concept of developing algorithms that solve specific problems and are readily implementable on the existing equipment without need for additional computing devices. The contribution of the paper consists of stating and solving the problem of developing and testing an automatic elastic torque control system for the shaft of a heavy-duty rolling mill. This system has been implemented in the form of algorithms that run in the software of the existing industrial controllers (PLCs). It is simple and performs well. It does not need additional sensors or computers to be implemented, nor does it rely on complex computational algorithms. Such algorithms are based on computational tables that require a priori data on numerous process parameters. In our literature review, we have not come across any industrial implementation of such algorithms on hot-rolling mills.

A NUMERICAL SIMULATION OF STRIP PROFILE IN A 6-HIGH COLD ROLLING MILL

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5655-5660 ◽  
Author(s):  
XIAOZHONG DU ◽  
QUAN YANG ◽  
CHENG LU ◽  
ANH KIET TIEU ◽  
SHINIL KIM
Keyword(s):  
Rolling Mill ◽  
Shape Control ◽  
Work Roll ◽  
Fem Model ◽  
Bending Force ◽  
Roll Bending ◽  
Strip Profile ◽  
Control Capability ◽  
Edge Drop ◽  
Strip Crown

Shape control is always a key issue in the six-high rolling mill, in which the shifting of the intermediate roll and the work roll have been used to enhance the shape control capability. In this paper, a finite element method (FEM) model has been developed to simultaneously simulate the strip deformation and the roll stack deformation for the six-high rolling mill. The effects of the work-roll bending, the shifting of the intermediate roll and the work roll on the strip crown and edge drop are discussed in details. Results have shown that both higher bending force and more roll shifting will significantly reduce the strip crown. The edge drop is also reduced with the bending force and the roll shifting.

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