Coupled Dynamic Modeling of Rolls Model and Metal Model for Four High Mill Based on Strip Crown Control

• Published in: Chinese journal of mechanical engineering Vol. 26; no. 1; pp. 144 - 150
• Main Authors: Sun, Jianliang, Peng, Yan, Liu, Hongmin
• Format: Journal Article
• Language: English
• Published: Beijing Chinese Mechanical Engineering Society 2013; Springer Nature B.V; National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004, China%National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004, China; State Key Laboratory of Metastable Materials Science & Technology, Yanshan University,Qinhuangdao 066004, China
• Edition: English ed.
• Subjects: Beams (structural); Cold rolling mills; Cold tandem mills; Computer simulation; Continuous rolling; Control systems; Deformation; Dynamic characteristics; Dynamic models; Elastic layers; Electrical Machines and Networks; Electronics and Microelectronics; Engineering; Engineering Thermodynamics; Force distribution; Heat and Mass Transfer; Instrumentation; Machines; Manufacturing; Mechanical Engineering; Modelling; New technology; Nonlinear systems; Optimization; Parameters; Power Electronics; Processes; Roll gap; Rolling mills; Rolls; Simulation; Stress concentration; Strip; Theoretical and Applied Mechanics; Two dimensional flow; Two dimensional models; 三维动态模型; 凸度控制; 动力学建模; 动态仿真模型; 四辊轧机; 板材轧机; 金属模型; 非线性系统; transverse vibration of rolls; strip crown; dynamic simulation; dynamic conservation of material flow
• ISSN: 1000-9345; 2192-8258
• DOI: 10.3901/CJME.2013.01.144

The crown is a key quality index of strip and plate, the rolling mill system is a complex nonlinear system, the strip qualities are directly affected by the dynamic characteristics of the rolling mil. At present, the studies about the dynamic modeling of the rolling mill system mainly focus on the dynamic simulation for the strip thickness control system, the dynamic characteristics of the strip along the width direction and that of the rolls along axial direction are not considered. In order to study the dynamic changes of strip crown in the roiling process, the dynamic simulation model based on strip crown control is established. The work roll and backup roll are considered as elastic continuous bodies and the work roll and backup roll are joined by a Winkler elastic layer. The rolls are considered as double freely supported beams. The change rate of roll gap is taken into consideration in the metal deformation, based on the principle of dynamic conservation of material flow, the two dimensional dynamic model of metal is established. The model of metal deformation provides exciting force for the rolls dynamic model, and the roils dynamic model and metal deformation model couple together. Then, based on the two models, the dynamic model of rolling mill system based on strip crown control is established. The Newmark-13 method is used to solve the problem, and the dynamic changes of these parameters are obtained as follows： （1） The bending of work roll and backup roll changes with time; （2） The strip crown changes with time; （3） The distribution of rolling force changes with time. Take some cold tandem rolling mill as subject investigated, simulation results and the comparisons with experimental results show that the dynamic model built is rational and correct. The proposed research provides effective theory for optimization of device and technological parameters and development of new technology, plays an important role to improve the strip control precision and strip shape quality.