Model Adaptive Learning in Process Control of Strip Cold Rolling

2013 ◽  
Vol 423-426 ◽  
pp. 775-779
Author(s):  
Jin Lan Bai ◽  
Xiang Li ◽  
Jun Sheng Wang
Keyword(s):  
Process Control ◽  
Cold Rolling ◽  
Adaptive Learning ◽  
Rolling Mill ◽  
Calculated Data ◽  
Processing Parameters ◽  
Learning Program ◽  
Cold Rolling Mill ◽  
Line Process ◽  
Data Adaptive

In this paper, mathematic models of processing parameters and their adaptive learning principle in strip cold rolling mill are introduced. Exponential smoothing method is used during model adaptive learning. According to the contrast between actual and calculated data, adaptive learning coefficients in the process control models are modified, thus the precision of presetting model is improved. Based on three kinds of adaptive learning modes, corresponding model adaptive learning program is developed for strip cold rolling. The practical application shows that the accuracy of this method can meet the requirement of on-line process control, and it is suitable for process control in strip cold rolling mill.

Adaptive Learning of Bending Force Presetting Model in a Six-High Cold Rolling Mill

2011 ◽  
Vol 291-294 ◽  
pp. 601-605
Author(s):  
Jin Lan Bai ◽  
Jun Sheng Wang
Keyword(s):  
Cold Rolling ◽  
Adaptive Learning ◽  
Rolling Mill ◽  
Legendre Polynomials ◽  
Work Roll ◽  
Practical Application ◽  
Cold Rolling Mill ◽  
Bending Force ◽  
Roll Bending ◽  
Exponential Method

In this paper, adaptive learning method of bending force presetting model in a six-high cold rolling mill is introduced. Adaptive learning coefficient of bending force presetting model is calculated by contrast between measured and model calculated actual bending force, then exponential method is used to modify the adaptive learning coefficient to improve the precision of the bending force presetting model. While calculating model calculated actual bending force, Legendre polynomials are used to convert measured flatness data to quadratic and quartic flatness coefficient, then regulating quantity on the quadratic flatness coefficient of intermediate roll bending force and work roll bending force is determined based on their regulate capability. Practical application shows that precision of the bending force presetting model has improved significantly by adaptive learning.

Development of Pass Schedule Calculation Procedure for Single-Stand Reversing Cold Rolling Mill

2011 ◽  
Vol 239-242 ◽  
pp. 1883-1887
Author(s):  
Jin Lan Bai ◽  
Jun Sheng Wang
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Linear Equations ◽  
Calculation Procedure ◽  
Cold Rolling Mill ◽  
Pass Schedule ◽  
On Line ◽  
Line Process ◽  
Equal Power ◽  
Non Linear Equations

In this paper, pass schedule calculation method for single-stand reversing cold rolling mill is introduced. Newton－Rapshon method is used to solve non-linear equations composed of each pass loads according to equal power rolling strategy. After the thickness of each pass is calculated, rolling parameters of each pass is obtained by modification. Based on the method pass schedule calculation procedure is developed. The practical application shows that calculation result of program is close to the actual data, and the speed and stability of the procedure can meet the requirement of on-line process control, so it is suitable for the single-stand reversible cold rolling mill.

On-Line Process Modeling and Optimisation for a 20High Cold Rolling Mill

1997 ◽  
Vol 30 (13) ◽  
pp. 205-214
Author(s):  
A. Schneider ◽  
R. Werners ◽  
J. Heidepriem
Keyword(s):  
Cold Rolling ◽  
Process Modeling ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
On Line ◽  
Line Process

Developing an effective diagnosis for safety improvement in steelworks

2005 ◽  
Vol 4 (4) ◽  
pp. 229-240
Author(s):  
A.R. Hale ◽  
H.A. v.d. Waterbeemd ◽  
R. Potter ◽  
B.H. Heming ◽  
P.H.J.J. Swuste ◽  
...  
Keyword(s):  
Control System ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Safety Management ◽  
Risk Control ◽  
Cold Rolling Mill ◽  
Rich Picture ◽  
Safety Improvement ◽  
Effective Diagnosis ◽  
Current Risk

The paper describes the methods used for a study of the safety management system and culture of a cold rolling mill in a steel plant. It uses data from diverse sources which can be validated against each other and combined to produce a rich picture of the current risk control system and its shortcomings. The paper also describes the proposed improvements and what the plant chose to implement. This step also throws light on the culture of the plant.

FEM Analysis of Profile Control Capability during Rolling in a 6-High CVC Cold Rolling Mill

2014 ◽  
Vol 988 ◽  
pp. 257-262 ◽  
Author(s):  
Ke Zhi Linghu ◽  
Zheng Yi Jiang ◽  
Fei Li ◽  
Jing Wei Zhao ◽  
Meng Yu ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Rolling Force ◽  
Fem Analysis ◽  
Continuous Variable ◽  
Cold Rolling Mill ◽  
Strip Rolling ◽  
Roll Bending ◽  
Profile Control ◽  
Control Capability

A 3D elastic-plastic finite element method (FEM) model of cold strip rolling for 6-high continuous variable crown (CVC) rolling mill was developed. The rolling force distributions were obtained by the internal iteration processes. The calculated error has been significantly reduced by the developed model. the absolute error between the simulated results and the actual values is obtained to be less than 10μm, and relative error is less than 1%. The developed model is significant in investigating the profile control capability of the CVC cold rolling mill in terms of work roll bending, intermediate roll bending and intermediate roll shifting.

Optimization of the technological and thermal conditions in a reversing cold rolling mill

2015 ◽  
Vol 2015 (1) ◽  
pp. 30-35 ◽  
Author(s):  
E. A. Garber ◽  
A. E. Aleshin ◽  
S. S. Degtev ◽  
A. I. Traino
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Thermal Conditions ◽  
Cold Rolling Mill

Thickness Indirect Measurement Method for Direct Pulling Pilot Cold Rolling Mill

2011 ◽  
Vol 189-193 ◽  
pp. 2670-2674
Author(s):  
Zhi Jie Jiao ◽  
Chun Yu He ◽  
Jian Ping Li ◽  
Xiang Hua Liu
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Measurement Method ◽  
Rolling Process ◽  
Indirect Measurement ◽  
Cold Rolling Mill ◽  
Movement Data ◽  
Program Flow ◽  
New Type ◽  
Exit Speed

Pilot cold rolling mill is the important tool for the cold rolling process researching and new steel grade development. According to the design of the new type direct pulling pilot cold rolling mill, based on the mass flow constant principle, strip exit thickness indirect measurement method is studied. During rolling, strip entry and exit speed can be calculated accurately according to the measured value of two sides’ clamps movement. Data filtering treatment is adopted and program flow chart is designed. Based on the material entry thickness measured manually, exit thickness of all passes can be measured indirectly. This thickness indirect measurement method has been applied successfully on the new type pilot cold rolling mill, and the measurement results show that this method has a good accuracy.

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