High Precision Thickness Control in a Cold Rolling Mill using a Non-Linear Roll Stand Deflection Model

2021 ◽  
Author(s):  
Christopher Schulte ◽  
Xinyang Li ◽  
Dirk Abel ◽  
Gerhard Hirt
Keyword(s):  
Cold Rolling ◽  
High Precision ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Thickness Control ◽  
Non Linear

Linear theory for lateral displacements of a metal strip in a tandem cold-rolling mill with asymmetries

2008 ◽  
Vol 222 (7) ◽  
pp. 1131-1148 ◽  
Author(s):  
D J Gates ◽  
T Tarnopolskaya
Keyword(s):  
Cold Rolling ◽  
Linear Model ◽  
Rolling Mill ◽  
Neutral Line ◽  
Metal Strip ◽  
Cold Rolling Mill ◽  
Continuity Equations ◽  
Non Linear ◽  
Lateral Displacements ◽  
Model Equations

Asymmetries in the state of a cold-rolling mill cause lateral displacements of the metal strip, which sometimes result in a major breakdown of the mill. Non-linear model equations, previously employed, are reduced to a linear form via a first-order expansion of the plastic reduction equations, appropriate for small displacements. The continuity equations, normally applied at the entry and exit of a stand, are replaced by simpler equations applied on the neutral line. These simplifications provide explicit formulae for equilibrium lateral displacements, which lead to more general conclusions. Moreover, these formulae do not involve the compliance and reaction of the mill, but relate the displacements to strip conditions and roll-gap asymmetries alone. A strong coupling between the stands and a strong upstream influence are demonstrated. The results agree with that of a non-linear model and with data from a laboratory mill. Increasing entry tension to the first stand, up to moderate levels, has the beneficial effect of reducing the size of the lateral displacements. However, the model predicts that abnormally high strip tension or low friction can lead to divergent displacements, which would crash the mill. The results offer the potential for better control and should be of interest to mill operators.

scholarly journals Thickness Control Based on Robust Control Method for Reverse Cold Rolling Mill

1993 ◽  
Vol 79 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Yoshiharu NISHIDA ◽  
Akira KITAMURA ◽  
Syosei YAMAMOTO ◽  
Shinichi TARUMOTO
Keyword(s):  
Robust Control ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Control Method ◽  
Cold Rolling Mill ◽  
Thickness Control

Tension and Thickness Control Strategy Analysis of Two Stands Reversible Cold Rolling Mill

2012 ◽  
Vol 19 (10) ◽  
pp. 20-25 ◽  
Author(s):  
Guang-ming Liu ◽  
Hong-shuang Di ◽  
Cun-long Zhou ◽  
Hong-cui Li ◽  
Jiang Liu
Keyword(s):  
Cold Rolling ◽  
Control Strategy ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Strategy Analysis ◽  
Thickness Control

The Computer System of High Precision Reversible Cold Rolling Mill

1992 ◽  
Vol 25 (19) ◽  
pp. 181-186
Author(s):  
Tong Chaonan ◽  
Zhang Hongwei ◽  
Wang Jing ◽  
Sun Yikang
Keyword(s):  
Cold Rolling ◽  
Computer System ◽  
High Precision ◽  
Rolling Mill ◽  
Cold Rolling Mill

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.

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