scholarly journals Collaboration Strategy Based on Conflict Resolution for Flatness Actuator Group

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Zhu-Wen Yan ◽  
Bao-Sheng Wang ◽  
He-Nan Bu ◽  
Long Pan ◽  
Lei Hong ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Conflict Resolution ◽  
Rolling Mill ◽  
Control Process ◽  
Collaborative Optimization ◽  
Cold Rolling Mill ◽  
Flatness Control ◽  
Optimal Adjustment ◽  
Control Accuracy ◽  
Flatness Measurement

During the flatness control process, there are frequently some uncoordinated regulating behaviors in the flatness actuator group. This has a bad influence on the flatness control accuracy and the flatness control efficiency. Therefore, a collaboration strategy based on conflict resolution for the flatness actuator group has been proposed in this paper. First of all, the feature of flatness measurement value is extracted through establishing the actual flatness condition discriminating factor. After that, the coordination cooperation that is appropriate to the actual flatness condition is developed for the flatness actuator group. Finally, the optimal adjustment of the actuator population is solved by the coordinated algorithm of Topkis-Veinott and genetic algorithm collaborative optimization. The collaboration strategy proposed in this paper has been successfully applied to a flatness control system of a 1450 mm five-stand 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.

scholarly journals Investigation and Optimization of Load Distribution for Tandem Cold Steel Strip Rolling Process

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 677 ◽  
Author(s):  
Xin Jin ◽  
Changsheng Li ◽  
Yu Wang ◽  
Xiaogang Li ◽  
Yongguang Xiang ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Cold Rolling ◽  
Prediction Model ◽  
Load Distribution ◽  
Rolling Mill ◽  
Fitness Function ◽  
Steel Strip ◽  
Rolling Process ◽  
Cold Rolling Mill ◽  
Tandem Cold Rolling

In order to improve the cold rolled steel strip flatness, the load distribution of the tandem cold rolling process is subject to investigation and optimization. The strip deformation resistance model is corrected by an artificial neural network that is trained with the actual measured data of 4500 strip coils. Based on the model, a flatness prediction model of strip steel is established in a five-stand tandem cold rolling mill, and the precision of the flatness prediction model is verified by rolling experiment data. To analyze the effect of load distribution on flatness, the flatness of stand 4 is calculated to be 7.4 IU, 10.6 IU, and 16.8 IU under three typical load distribution modes. A genetic algorithm based on the excellent flatness is proposed to optimize the load distribution further. In the genetic algorithm, the classification of flatness of stand 4 calculated by the developed flatness prediction model is taken as the fitness function, with the optimal reduction of 28.6%, 34.6%, 27.3%, and 18.6% proposed for stands 1, 2, 3, and 4, respectively. The optimal solution is applied to a 1740 mm tandem cold rolling mill, which reduce the flatness classification from 10.8 IU to 3.2 IU for a 1-mm thick steel strip.

Preset model of bending force for 6-high reversing cold rolling mill based on genetic algorithm

2011 ◽  
Vol 18 (5) ◽  
pp. 1487-1492 ◽  
Author(s):  
Jian-guo Cao ◽  
Xiao-zhao Xu ◽  
Jie Zhang ◽  
Mu-qing Song ◽  
Gui-liang Gong ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Bending Force

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

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.

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