宽带钢冷连轧机综合耦合模型的建立与分析

Derivation and Analysis of Complex Coupling Model for Wide Strip Tandem Cold Mill

宽带钢冷连轧过程中,板形、板厚和张力控制之间存在着很强的耦合关系,相互影响对方的调节功效。为了进一步提高控制精度,进行解耦设计实现解耦控制是十分有效的手段,而其前提和基础就是冷连轧机综合耦合模型的建立和分析。首先,运用轧制理论对轧制过程中板形、板厚和张力控制的各种影响因素进行了系统的分析,然后考虑执行内环的动态特性建立冷连轧机综合耦合模型,以定量地描述轧制过程中辊缝、弯辊力、本架轧辊速度、前架轧辊速度和出口厚度、出口凸度、出入口张力之间的耦合影响关系。最后,基于Matlab/Simulink工具,采用此耦合模型对某冷连轧机末机架的耦合特性进行仿真分析,指出对其进行解耦控制的必要性。

Shape, thickness and tension control interact each other intensively in wide strip tandem cold rolling process, which leads to reduction of the control system＇s performance. In order to improve control precision of tandem cold rolling process, decoupling design to realize decoupling control is a quite effective method, which is based on the building and analysis of comprehensive coupling model for tandem cold mill. First, rolling theory is used to systematically analyze various influencing factors of shape control, thickness control and tension control in the rolling process. Then, the comprehensive coupling model for tandem cold mill is built with consideration of the dynamic characteristics of inner ring, so as to quantitatively describe the coupling relations among roll gap, roll bending force, roll speed, outlet thickness, outlet crown, and inlet/outlet tensions. At last, based on the Matlab/Simulink tools, this coupling model is used to carry out simulation analysis of the coupling characteristics of the last stand of some tandem cold mill, and the necessity of its decoupling control is pointed out.