Discusion on simulator assessment of tandem cold-rolling-mill automatic gauge-control systems

1964 ◽  
Vol 111 (9) ◽  
pp. 1615
Keyword(s):  
Cold Rolling ◽  
Control Systems ◽  
Rolling Mill ◽  
Cold Rolling Mill ◽  
Tandem Cold Rolling ◽  
Automatic Gauge Control

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.

The Integrated Robust Control of Interstand Strip Tension for Tandem Cold Rolling Mill

2010 ◽  
Vol 145 ◽  
pp. 230-237 ◽  
Author(s):  
Xiao Feng Zhang ◽  
Qing Dong Zhang ◽  
Meng Yu ◽  
Kang Jian Wang ◽  
Pei Jie Huang
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Controller Design ◽  
Integrated Control ◽  
Cold Rolling Mill ◽  
Tandem Cold Rolling ◽  
Synthesis Design ◽  
Tandem Cold Mill ◽  
Strip Quality ◽  
Cold Mill

We describe an integrated tension controller design for a tandem cold rolling mill in steel plants. To achieve stable rolling and ensure strip quality, it is very important to control the tension of the cold rolling mill. Previous researches examined only the operation of a single stand. But it is not sufficient to examine the operation and effect of whole stands because the operation is wholly interdependent. To solve the problem, this paper proposes an integrated control strategy for tension control of tandem cold mill, the full stand model for the tension system of a tandem cold mill is built, and the interaction of all the stands is analyzed. Then applying the method of μ-synthesis design a integrated robust tension controller. Simulation with the practical data proves the integrated robust tension controller can achieve more robust performance than that of typical industrial approach.

More from the Mill

2000 ◽  
Vol 122 (10) ◽  
pp. 82-87
Author(s):  
Michael Valenti
Keyword(s):  
Cold Rolling ◽  
Control Systems ◽  
Rolling Mill ◽  
Space Shuttle ◽  
State Of The Art ◽  
Steel Strip ◽  
Cold Rolling Mill ◽  
Automated Control ◽  
The World

This article focuses on the launch of Sputnik that transfixed the world by Carpenter Technology Corp. By incorporating advanced processing equipment, including a rolling mill, shape controller, annealing furnaces, wet grinders, and leveler with state-of-the-art automated control systems, Carpenter has improved the productivity and quality of its high value strip at a time when Space Shuttle launchings are taken in stride. The Carpenter specialty strip facility installed a cold rolling mill designed by Joseph Frohling GmbH of Olpe, Germany, in November last year, to increase rolling capacity and guarantee that the steel strip it produces meets the desired shape and thickness. In the Frohling mill, strip passes between two working rolls that reduce its thickness to sizes between 0.150 and 0.008 inch, at speeds up to 1500 feet per minute. Carpenter also installed three Ebner vertical annealing furnaces. Coiled strip on mandrels is unwound through each furnace, annealed, then rewound continuously to promote productivity.

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.

Study on the Shifting Model of Edge Drop Control in Ultra-Wide 6-High Tandem Cold Rolling Mill

2012 ◽  
Vol 452-453 ◽  
pp. 1257-1261 ◽  
Author(s):  
Jian Guo Cao ◽  
Yan Lin Wang ◽  
Hong Bo Li ◽  
Mu Qing Song ◽  
Sheng Hui Jia ◽  
...  
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Work Roll ◽  
Cold Rolling Mill ◽  
Tandem Cold Rolling ◽  
Cold Rolling Mills ◽  
Important Quality ◽  
Control Work ◽  
Edge Drop

Edge drop is an important quality evaluating index for strip cross-section with the increasing of requirement for higher gauge accuracy to meet customer's demand. The mathematical model of roll shifting system plays an important role in controlling the edge drop on modern tandem cold rolling mills. Based on the explicit dynamic finite element method, a 3D finite element simulation model of rolls and strip is established for a large ultra-wide 6-high cold rolling mill with the developed EDW (edge drop control work roll) and the matched CVC intermediate roll to investigate the effect of work roll shift on edge drop of strip. Considering on the characteristics of EDW work rolls, equivalent area compensated method has been put forward to build the shifting model for edge drop control. The results indicated that the values of edge drop are less than 7μm by using the proper shifting model and the shifting model can be used to guide the practical production.

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