Design of modernization of control valves for the counter-bending forces regulation in finishing mill

2017 ◽  
Vol 2 (80) ◽  
pp. 56-64
Author(s):  
E. Evin ◽  
J. Tkáčová ◽  
Z. Lengyel
Keyword(s):  
Control System ◽  
Rolling Mill ◽  
Rolled Strip ◽  
Rolling Mills ◽  
Control Valves ◽  
Integrated Electronics ◽  
Finishing Mill ◽  
Position Controller ◽  
Hot Rolled

Purpose: The aim of this paper is design of modernization of control valves of finishing mill to control the counter-bending forces on the last stands by replacement of proportional valves with regulating ones. Design/methodology/approach: New board (construction, location and arrangement of valves) was designed, model of which was constructed by SolidWorks software. Findings: The solution was oriented to optimization by replacement of proportional valves for regulating ones to control the counter-bending forces on the rolling mills. The selected types of proportional and regulating valves were compared. The main advantage of the application of regulating valves is integrated electronics with position controller for pilot valve control and position feedback disposal. Based on the parameters of the regulating valve the new respite and relief valves were designed. Research limitations/implications: Design of substitution of upper and lower blocks of control valves and modelling the motherboards using SolidWorks software was conditional by dimensions of currently used hydraulic components and dimensions of the proposed valves. Designed blocks ensure the functioning of the control system of counter bending of working rolls. In the future the perspective to control the counterbending forces can be carried out by innovation of the rolling mill by pump control using asynchronous converters and/or by changing the structure of the arrangement of rolling mill and by design of CVC control of the rolling mill. Practical implications: New board (construction, location and arrangement of valves) was designed, model of which was constructed by SolidWorks software. Designed board ensures the functioning of the control system for counter-bending of working rolls. Originality/value: The result of the proposed solutions is increasing the quality of the hot rolled strip i.e. reduction of the strip waviness and keeping the cross section of the strip.

Vacuum Flat Bed Filter Control System for Cold Strip Rolling Mill

2010 ◽  
Vol 152-153 ◽  
pp. 1561-1564
Author(s):  
Song Lei ◽  
Jun Sheng Wang ◽  
Min Gang Shen ◽  
Xue Bo Chen ◽  
Sheng Li Li
Keyword(s):  
Control System ◽  
Rolling Mill ◽  
Rolled Strip ◽  
Vacuum Filter ◽  
Control Logic ◽  
Strip Rolling ◽  
Cold Rolled ◽  
Cold Strip Rolling ◽  
Filter Fabric

The vacuum flat bed filter is important equipment for the cold strip rolling because the surface quality of cold rolled strip is paid more attention by customer. In the paper, the function, mechanical structure and operation modes of the vacuum flat bed filter for cold strip rolling mill are introduced. The control logic of emulsion liquid level in the filter is discussed. The filter fabric running modes are designed. The control system for vacuum filter is developed based on PCS7 software and S7-400 PLC hardware of SIMENS.

Study on Transverse Uniformity of Phase Transformation for Hot-Rolled Strip on Run-out-Table

2014 ◽  
Vol 941-944 ◽  
pp. 2309-2312
Author(s):  
Dong Cheng Wang ◽  
Feng Dong ◽  
Hong Min Liu
Keyword(s):  
Numerical Simulation ◽  
Phase Transformation ◽  
Temperature Field ◽  
Transformation Model ◽  
Rolled Strip ◽  
Continuous Cooling Transformation ◽  
Hot Rolled Strip ◽  
Finishing Mill ◽  
Transverse Temperature ◽  
Hot Rolled

A numerical simulation of phase transformation for hot-rolled strip on run-out-table are introduced in the present work combined with experiment. Continuous-cooling-transformation (CCT) diagram are used to regress the transformation model of Q345B. Temperature field coupled with phase transformation is analyzed on run-out-table. Evolution of temperature and organization during cooling are analyzed for the hot-rolled strip between the last stand of finishing mill and coiling. It is concluded that the transverse temperature has significant effect on the uniformity of phase transformation.

EFFECT OF ASYMMETRICAL STAND STIFFNESS ON HOT ROLLED STRIP SHAPE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5734-5739 ◽  
Author(s):  
DIANYAO GONG ◽  
JIANZHONG XU ◽  
ZHENGYI JIANG ◽  
XIAOMING ZHANG ◽  
XIANGHUA LIU ◽  
...  
Keyword(s):  
Rolling Mill ◽  
Deformation Analysis ◽  
Rolled Strip ◽  
Force Distribution ◽  
Influence Coefficient ◽  
Single Wave ◽  
Hot Rolled Strip ◽  
Strip Shape ◽  
Roll Deformation ◽  
Hot Rolled

The difference of elastic springs between the operating side (OS) and driving side (DS) of rolling mill has a significant influence on the strip shape not just the strip thickness. Based on the slit beam and roll deformation theories, the roll force distribution was analysed considering the asymmetric stiffness of the OS and DS of rolling mill, and the work roll and backup roll deformation equations were deduced respectively, and the thickness distribution in lateral direction of the hot rolled strip at exit was discussed. Using the roll elastic deformation analysis software which was developed previously based on the influence coefficient method, the roll flattening distribution, roll pressure distribution and the rolling force distribution caused by the asymmetric stand stiffness were calculated and analysed, and the exit strip profile of the rolling mill was also presented. The relationship between the mill stiffness difference and the strip wedge shape or single wave was obtained. Effect of the upstream asymmetric mill on strip crown and flatness of the downstream stands was discussed.

Modelization of the Rolling Mill with a FE Code

2015 ◽  
Vol 651-653 ◽  
pp. 291-296 ◽  
Author(s):  
Damien Chevalier ◽  
Pierre Cezard ◽  
Laurent Langlois ◽  
Régis Bigot
Keyword(s):  
Process Parameters ◽  
Production Line ◽  
Rolling Mill ◽  
Production Costs ◽  
Internal Quality ◽  
Industrial Data ◽  
Rolled Material ◽  
Major Factors ◽  
Hot Rolled

To reduce production costs and to improve performances of hot rolled products, it is necessary to optimize the production line. The rolling mill is one of the major factors which affect the internal quality. In fact the process tends to reduce the size of defects during the strain. The production line consisting of 24 stands has been modeled with a commercial FE-code FORGE®. First, a model has been developed and adjusted according to industrial data. Then a parametric study was carried out in order to estimate the influence of the process parameters on the internal quality of the rolled material.

scholarly journals Research of defects of hot-rolled steel having rolling nature of formation of the rolling shop no. 1 of rolling mill 850 at OJSC «BSW – Management Company of Holding «BMC»

2019 ◽  
pp. 60-68
Author(s):  
I. A. Kovaleva ◽  
Yu. A. Potapenko
Keyword(s):  
Rolling Mill ◽  
Western Europe ◽  
Great Influence ◽  
Rolled Steel ◽  
Management Company ◽  
Defects Analysis ◽  
Quality Of Products ◽  
Hot Rolled ◽  
Hot Rolled Steel

Rolling is the final stage of the metallurgical cycle and has a great influence on the quantity and quality of products, as well as on various technological and economic indicators of the plant.The OJSC « BSW – Management Company of Holding «BMC» is working on the development and supply of hot-rolled round products for the automotive industry in Western Europe.The increasing requirements for the quality of the surface of hot-rolled steel are a powerful incentive to improve the technology of its production, which is impossible without the use of modern methods of control and proper identification of detected defects.The article presents the results of the study of defects of hot-rolled products of rolling mill № 1 850, having the rolling nature of formation.Metallographic study was conducted on the basis of: visual inspection of defects, in some cases with the preparation of a template for the study of macrostructure and location of defects; analysis of images of the microstructure of the cross section of the sample in the area of defects. With the help of characteristic external and microstructural features of defects, special etching in reagents, the causes of their formation were established, and recommendations for their minimization or complete elimination were proposed.

A Setup Calculation Method of Application Platform for Process Сontrol System of Tandem Cold Rolling Mills

2016 ◽  
Vol 850 ◽  
pp. 494-501 ◽  
Author(s):  
Jin Shan Chen ◽  
Chang Sheng Li
Keyword(s):  
Control System ◽  
Process Control ◽  
Cold Rolling ◽  
Calculation Method ◽  
Process Control System ◽  
Rolling Mills ◽  
Tandem Cold Rolling ◽  
Cold Rolling Mills ◽  
Calculation Module

Setup calculation function of the process control system for tandem cold rolling mills not only determinates the dimension accuracy of finished strip materials directly, but also affects the control of surface quality of strip materials. In the present work, an attempt was made to develop a new setup calculation method for tandem cold rolling mills to maximize the throughput and improve the surface quality of strips. Based on the application platform for level-2 process control system, the modular design method was adopted, and then the setup calculation function was developed. And four functional modules consisting of preset preparation module (PPM), basic setup calculation module (BSCM), dynamic setup calculation module (DSCM), and adaptive calculation module (ACM) were developed. The preset data from PPM were used in equipment of level-1 process control system, and the purposes of BSCM was to achieve high quality of products, reduce off thickness deviation and achieve stable rolling at maximum possible rolling speed for raising productivity. In order to minimize off error of preset and actual data, DSCM was provided. Thanks to the design of ACM, accuracy of mathematical model can be effectively improved on line. Ultimately, the precise model on setup calculation method for cold tandem rolling of strip steels was established, and then it was put into practical production. Statistics analysis showed that the measured data was in excellent agreement with the model, and exactly, the relative deviations on rolling force and delivery thickness of strips were less than 3.67% and 0.42%, respectively. The new setup calculation method has high precision and good generalization capability.

Study of Used Rolls Profile Influence on the Quality of Hot Rolled Metal

2013 ◽  
Vol 814 ◽  
pp. 1-6
Author(s):  
Olga Krivtsova ◽  
Alexandr Viventsev ◽  
Vitaly Talmazan ◽  
Dinislyam Musin ◽  
Alexandr Arbuz
Keyword(s):  
Mathematical Models ◽  
Hot Rolling ◽  
Rolling Mill ◽  
Second Grade ◽  
Rolled Metal ◽  
Hot Rolling Mill ◽  
Hot Rolled ◽  
Work Rolls

The influence of used work rolls profiling on the quality of hot rolled metal was studied. The defect non-flatness is the main reason for hot rolled metal rejection to second grade at the continuous hot rolling mill 1700 of ArcelorMittal Temirtau JSC. The most optimal among studied profiling is concave profiling with average cumulative value ΣΔ=1.71mm. This is evidenced by the least volume of hot rolled metal, rejected to the second grade due to non-flatness.There were mathematical models developed, forecasting the volume of metal, rolled with the defect non-flatness with definite cumulative profiling of work rolls.

The Optimization Plastic Coefficient in AWC Research and Application

2014 ◽  
Vol 941-944 ◽  
pp. 1221-1224
Author(s):  
Fang Chen Yin ◽  
Geng Sheng Ma ◽  
Jia Xue Yu ◽  
Ya Feng Ji ◽  
Bo Wang ◽  
...  
Keyword(s):  
Control System ◽  
Linear Prediction ◽  
Rolled Strip ◽  
Steel Product ◽  
Strip Steel ◽  
Hot Rolled Strip ◽  
Main Factors ◽  
Input Variables ◽  
Plasticity Coefficient ◽  
Hot Rolled

Aimed at the main factors of hot rolled strip steel product width fluctuation, rolled piece is put forward to plasticity coefficient and entrance width as the input variables of feedforward AWC control algorithm.Expounds a kind of optimization of plasticity coefficient Q feedforward AWC control system principle and plasticity coefficient Q of linear prediction algorithm.Field application shows that the Q prediction feedforward AWC has significant effect on inhibition of hot rolled strip width deviation.

Research on Abrasion Mechanism of Working Roll and Strategies of Anti-Wear in Tension Leveler

2014 ◽  
Vol 577 ◽  
pp. 174-177
Author(s):  
Bing Chen ◽  
Ming Cheng He ◽  
Hai Hai Lin
Keyword(s):  
Heat Treatment ◽  
Abrasive Wear ◽  
Rolling Mill ◽  
Working Condition ◽  
Main Type ◽  
Surface Hardness ◽  
Rolled Strip ◽  
Wear Rates ◽  
Hot Rolled Strip ◽  
Hot Rolled

Combining with both working condition of working roll in tension leveler and wear classification, this paper maintains that abrasive wear is the main type of working roll’s abrasion, and states that shape defects of hot rolled strip is the main cause of the abnormal abrasion of working roll, and concludes that to reduce the wear of working roll relying solely on technology of tension leveling has its limits. So, combining with the materials of working roll in tension leveler and rolling mill, the surface hardness and the wear rates of different materials after heat treatment are experimentally analyzed to provide a theoretical guidance for the further improvement of working roll’s materials.

An increase in the surface quality of hot-rolled strip

Metallurgist ◽  
1963 ◽  
Vol 7 (5) ◽  
pp. 223-224
Author(s):  
M. A. Benyakovskii ◽  
O. A. Mel'nikov ◽  
L. N. Chukhlova ◽  
S. K. Glukhov
Keyword(s):  
Surface Quality ◽  
Rolled Strip ◽  
Hot Rolled Strip ◽  
Hot Rolled
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