Flatness Control Strategy Based on Delay Compensation for Cold Rolling Mill

2016 ◽  
Vol 88 (2) ◽  
pp. 1600065 ◽  
Author(s):  
Wang Pengfei ◽  
Peng Yan ◽  
Wang Dongcheng ◽  
Sun Jie ◽  
Zhang Dianhua ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Control Strategy ◽  
Rolling Mill ◽  
Delay Compensation ◽  
Cold Rolling Mill ◽  
Flatness Control

Study on Flatness Control Strategy of a Single-Stand Reversing Cold Rolling Mill

2014 ◽  
Vol 1004-1005 ◽  
pp. 1193-1197
Author(s):  
Jin Lan Bai ◽  
Hong Zhi Pan
Keyword(s):  
Cold Rolling ◽  
Control Strategy ◽  
Rolling Mill ◽  
Work Roll ◽  
Calculation Model ◽  
Cold Rolling Mill ◽  
Roll Bending ◽  
Pass Schedule ◽  
Flatness Control ◽  
Work Roll Shifting

In this paper, an integrated rolls system deformation calculation model is established based on the influence function method combining with pass schedule calculation, rolls wear and roll thermal deformation calculation, and the corresponding calculation procedure has been developed. Then the influence of work roll bending, work roll shifting and intermediate roll bending on transverse distribution of strip thickness, strip crown, quadratic flatness, and quartic flatness are analyzed with the procedure. According to the analysis result, flatness control strategy of the single-stand reversing cold rolling mill is determined. The flatness control strategy will provide the basis for flatness control presetting of the mill. The practical application shows that the flatness control strategy is suitable for flatness control of the single-stand reversing cold rolling mill.

Target Curve Setting Model for Automatic Flatness Control on Stand 5 of 2180 mm Tandem Cold Rolling Mill

2014 ◽  
Vol 665 ◽  
pp. 37-41 ◽  
Author(s):  
Guang Hui Yang ◽  
Jian Guo Cao ◽  
Jie Zhang ◽  
Hong Bo Li ◽  
Jie Zheng
Keyword(s):  
Cold Rolling ◽  
Temperature Stress ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Tandem Cold Rolling ◽  
Temperature Distributions ◽  
Strip Shape ◽  
Flatness Control ◽  
Transverse Temperature ◽  
Stress Compensation

Based on the theory of target curve, a method of improving flatness target curve is proposed. The transverse temperature distributions of strip are measured and described with a biquadratic expression, and the statistics method is used to analyze the temperature distributions. Finally, the additional temperature stress compensation is calculated to improve the strip shape.

Research and Application of Dynamic Substitution Control of Actuators in Flatness Control of Cold Rolling Mill

2010 ◽  
Vol 82 (4) ◽  
pp. 379-387 ◽  
Author(s):  
Wang Peng-fei ◽  
Zhang Dian-hua ◽  
Li Xu ◽  
Zhang Wen-xue
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Flatness Control

Observer-based multivariable flatness control of a cold rolling mill

1993 ◽  
Vol 1 (6) ◽  
pp. 917-925 ◽  
Author(s):  
I. Hoshino ◽  
M. Kawai ◽  
T. Matsuura ◽  
Hiroshi Kimura ◽  
Hidenori Kimura
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Flatness Control

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.

Supplementary Setting of Target Flatness Curves for 1450 Strip Cold Rolling Mill

2014 ◽  
Vol 633-634 ◽  
pp. 800-803
Author(s):  
Hai Zhou ◽  
Jin Lan Bai
Keyword(s):  
Cold Rolling ◽  
Orthogonal Polynomials ◽  
Rolling Mill ◽  
Temperature Compensation ◽  
Parameter Setting ◽  
Cold Rolling Mill ◽  
Actual Production ◽  
Original Target ◽  
Flatness Control

In this paper, for the original target flatness curves of flatness control system of a 1450 cold rolling mill can't satisfy the actual production, parameter setting method is adopted to the supplementary setting of target flatness curves. Based on the analysis of the several common forms of orthogonal polynomials, Legendre orthogonal polynomials are selected in supplementary setting according to the actual flatness. Considering temperature compensation, recoiling compensation, edge compensation, and comprehensive control of flatness and crown, 18 supplementary setting target flatness curves is determined aimed at typical product of the mill. Actual production shows that after the supplementary setting target flatness curves put into use, the flatness quality of the product has improved significantly.

Application of Fuzzy Logic on Flatness Control of Cold Rolling Mill

1997 ◽  
Vol 30 (13) ◽  
pp. 39-42
Author(s):  
XueJun Pan ◽  
TianYou Chai
Keyword(s):  
Fuzzy Logic ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Flatness Control

Performance Analysis of Asymmetrical Roll Bending for Flatness Control of Cold Rolling Mill

2010 ◽  
Vol 145 ◽  
pp. 93-99 ◽  
Author(s):  
Dian Hua Zhang ◽  
Peng Fei Wang ◽  
Wen Xue Zhang ◽  
Xu Li
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Work Roll ◽  
Control Analysis ◽  
Cold Rolling Mill ◽  
Roll Bending ◽  
Flatness Control ◽  
Efficiency Factors ◽  
Self Learning ◽  
Asymmetrical Bending

When there appeared catastrophic asymmetrical flatness defects in rolling processes, especially when the incoming strip is with a wedge shape, the tilting roll can hardly eliminate these defects completely. Moreover, the overshooting of tilting roll will lead to strip break. In order to improve the ability of cold rolling mill for asymmetrical flatness defects control, performance of the work roll asymmetrical bending as well as the intermediate roll asymmetrical bending has been analyzed, based on the actuator efficiency factors of them. In addition, for the purpose of obtaining accurate efficiency factors matrixes of actuators, a self-learning determination model of actuator efficiency factors was established in accordance with the practical rolling processes. In this paper, a 1250 single stand 6-H reversible UCM cold mill was taken as the object of this study, with efficiency factors of asymmetrical roll bending analyzed, which provides a theoretical basis for better flatness control. Analysis shows that the asymmetrical roll bending is significant for asymmetrical flatness control.

Observer-Based Multivariable Flatness Control of the Cold Rolling Mill

1993 ◽  
Vol 26 (2) ◽  
pp. 569-576 ◽  
Author(s):  
I. Hoshino ◽  
M. Kawai ◽  
M. Kokubo ◽  
T. Matsuura ◽  
Hirashi Kimura ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Flatness 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
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