Analysis of flatness control capability based on the effect function and roll contour optimization for 6-h CVC cold rolling mill

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.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.665.37 ◽

2014 ◽

Vol 665 ◽

pp. 37-41 ◽

Cited By ~ 1

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.

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Flatness Control Strategy Based on Delay Compensation for Cold Rolling Mill

steel research international ◽

10.1002/srin.201600065 ◽

2016 ◽

Vol 88 (2) ◽

pp. 1600065 ◽

Cited By ~ 2

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

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

steel research international ◽

10.1002/srin.201000166 ◽

2010 ◽

Vol 82 (4) ◽

pp. 379-387 ◽

Cited By ~ 6

Author(s):

Wang Peng-fei ◽

Zhang Dian-hua ◽

Li Xu ◽

Zhang Wen-xue

Keyword(s):

Cold Rolling ◽

Rolling Mill ◽

Cold Rolling Mill ◽

Flatness Control

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Observer-based multivariable flatness control of a cold rolling mill

Control Engineering Practice ◽

10.1016/0967-0661(93)90001-8 ◽

1993 ◽

Vol 1 (6) ◽

pp. 917-925 ◽

Cited By ~ 7

Author(s):

I. Hoshino ◽

M. Kawai ◽

T. Matsuura ◽

Hiroshi Kimura ◽

Hidenori Kimura

Keyword(s):

Cold Rolling ◽

Rolling Mill ◽

Cold Rolling Mill ◽

Flatness Control

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.572.55 ◽

2012 ◽

Vol 572 ◽

pp. 55-60 ◽

Cited By ~ 2

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.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.633-634.800 ◽

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.

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Application of Fuzzy Logic on Flatness Control of Cold Rolling Mill

IFAC Proceedings Volumes ◽

10.1016/s1474-6670(17)44366-7 ◽

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

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.145.93 ◽

2010 ◽

Vol 145 ◽

pp. 93-99 ◽

Cited By ~ 2

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.

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