Computer simulation of dynamic characteristics of tandem cold rolling process

1999 ◽  
Vol 13 (8) ◽  
pp. 616-624 ◽  
Author(s):  
Won Ho Lee ◽  
Sang Ryong Lee
Keyword(s):  
Computer Simulation ◽  
Cold Rolling ◽  
Dynamic Characteristics ◽  
Rolling Process ◽  
Tandem Cold Rolling

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.

scholarly journals An Advanced 3D Mathematical Model for a 6-high Tandem Cold Rolling Process

2017 ◽  
Vol 207 ◽  
pp. 1379-1384 ◽  
Author(s):  
Xiawei Feng ◽  
Pierre Montmitonnet ◽  
Quan Yang ◽  
Anrui He ◽  
Xiaochen Wang
Keyword(s):  
Mathematical Model ◽  
Cold Rolling ◽  
Rolling Process ◽  
Tandem Cold Rolling

scholarly journals Robust Tension Control of Strip for 5-Stand Tandem Cold Mills

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Behrooz Shafiei ◽  
Mohsen Ekramian ◽  
Khoshnam Shojaei
Keyword(s):  
Cold Rolling ◽  
Rolling Process ◽  
Tension Control ◽  
External Disturbances ◽  
Rolling Mills ◽  
Tandem Cold Rolling ◽  
Cold Rolling Mills ◽  
Hankel Norm ◽  
Norm Approximation

Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances. The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. This paper focuses on interstand tension control problem in 5-stand tandem cold rolling mills. Tension dynamics can be described by a nominal model perturbed by parametric uncertainties. In order to overcome the model uncertainties and external disturbances, suboptimalH∞andμcontrollers are proposed and the Hankel-norm approximation is used to reduce the order ofμcontroller. The performance of the proposed controllers is demonstrated by some simulations.

scholarly journals Stability Analysis of a Nonlinear Coupled Vibration Model in a Tandem Cold Rolling Mill

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Xing Lu ◽  
Jie Sun ◽  
Guangtao Li ◽  
Zhenhua Wang ◽  
Dianhua Zhang
Keyword(s):  
Hopf Bifurcation ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Vertical Direction ◽  
Rolling Process ◽  
Cold Rolling Mill ◽  
Mass System ◽  
Hopf Bifurcation Point ◽  
Tandem Cold Rolling ◽  
Vibration Model

Mill chatter in tandem cold rolling mill is a major rejection to the quality and production of the strips. In most mill vibration models, either the roll mass is usually limited to vibrate in vertical direction and vertical-horizontal directions, or the multiple rolls system is simplified to a single mass system. However, the torsional chatter is also a typical type of mill chatter, and the presence of intermediate roll and backup roll will affect the overall vibration of the mill structure system. In this paper, a newly cold rolling mill vibration model coupled with the dynamic rolling processing model and nonlinear vibration model is proposed with the consideration of dynamic coupling and nonlinear characteristics of the rolling process, multiroll equilibrium, and roll movement in both vertical-horizontal-torsional directions. By using Hopf bifurcation theorem and Routh–Hurwitz determinant, the existence of the Hopf bifurcation point of the mill vibration system and bifurcation characteristics are analyzed. At last, the influence of different rolling conditions on the stability of the coupled mill system is investigated, and these results can also be used to design an optimum rolling schedule and determine the appearance of mill chatter under certain rolling conditions.

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