冷轧平整板形控制工艺探讨

介绍了平整过程中影响板形缺陷的因素,提出了解决平整过程中板形缺陷的主要因素是轧辊的辊型控制,并分析指出了生产实际中可通过合适的原始辊型凸度、调整液压弯辊装置、倾斜轧辊以及调节轧制压力和带钢张力来改善平整板形的控制方法。     

冷轧机的板形控制目标模型

建立了薄带冷轧机的板形自动控制目标设定模型,它以轧后带钢的在线屈曲和后屈曲理论为板形生成的力学判据,以实测带钢温度横向分布为补偿,分别在203OCVC冷连轧机和1250HC冷轧机上运行成功。生产实绩证明其控制效果优于原用的引进模型,板形质量显著提高。     

Online Shape Dynamic Wrapping Angle Compensation Model of Cold Strip

 In specific condition, when wrapping angle of cold rolling strip covering surface of shape detecting roll dynamically changes, online radial compression of the shape detecting roll is changed too, and it seriously affects online shape detecting precision of cold strip. Based on the latest intelligent shape meter developed by Yanshan University, using PSO-BP neural network and actual working condition datum, the cold strip online dynamic wrapping angle compensation model is established, and successfully applied in 1250 mm 6-high cold mill, remarkable results are achieved. The error between calculated values and measured values of total tensions is within 3%.     

六辊CVC宽带轧机板形控制特性的计算机模拟

用条元法人析带材的三维塑性变形,用影响系数法分析辊系的弹性变形,将二联立,对1850mm六辊CVC轧机冷轧带材的板形和板凸度控制特性进行了计算机模拟。结果表明,改变CVC轧机中间辊横向位移量、工作辊弯辊力和中间辊变力等手段,对控制板形和板凸度都有很好的效果。     

宽带钢轧机板形控制技术比较研究

运用软件仿真方法并结合生产实践,从板形调控功效和板带轧机综合性能两个方面,比较研究了目前国际上各主要板形控制技术.研究结果不仅有助于板带轧机的选型和板形技术的配置,也有益于先进板形技术的创制.     

检测辊安装精度对冷轧带钢在线板形信号的影响

 基于几何关系和板形检测理论,建立了针对检测辊安装误差的在线板形信号误差补偿模型。结合轧机设备布局特点和工艺参数,针对固定包角和变包角两种安装方法,从水平误差和垂直误差2个方面,对在线板形信号进行综合误差的定量补偿。对于固定包角方式,检测辊安装精度的板形补偿量可设定为一常数;对于变包角方式,则需要根据变动态包角计算公式,在线实时计算动态补偿量。基于理论分析和工业实际数据,制定适合轧机自身特点的检测辊允许安装误差,才能最大限度地提高板形检测精度,使综合补偿后的板形曲线更真实地反映在线冷轧带钢的实际板形状况。以某1050冷轧机为例,其水平误差和垂直误差建议分别控制在0.03和0.05mm以内,才能满足基本的板形控制技术要求。     

Shape Setup System for 1700 Hot Strip Mill

 Shape setup (SSU) system is the core technology for hot strip mill (HSM). A precise SSU system was used to improve the strip quality for HSM. The function of SSU, setup, and feedback was introduced. The main mathematical models of roll gap profile and longitudinal strain difference are set up. Strip profile allocation strategy was researched according to the SSU system of a domestic 1 700 mm HSM. The SSU system was put into practical use and the measurement results showed that strip flatness variation and strip profile variation could be controlled in target scope.     

Development and Experimental Evaluation of Strip Shape Prediction Model for Sendzimir Rolling Mills

It is difficult to obtain the desired strip shape using Sendzimir rolling mills because small diameter work rolls can be easily deformed by the rolling force. To control the strip shape effectively, it is important to understand the relationship between the behavior of the shape actuator and the variation of the strip shape. A numerical model based on the contact element method was proposed for the prediction of strip shape. In this numerical model, the relationships between the actuating forces, the roll deflections, the thickness profiles of the entry and exit sides, and the strip shape were considered. The proposed numerical model for strip shape prediction was evaluated by computer simulation and experiment with respect to various AS-U roll and first intermediate roll positions.     

考虑来料板形遗传影响的带钢平直度模型

根据轧制理论中的体积不变原理和平直度的基本定义,考虑来料板形的遗传影响,推导出了以入口和出口带钢相对凸度差表示的带钢平直度模型.该模型在连轧机参数优化设计和辊型配置优化设计系统中均得到应用,效果良好.     

单机平整机轧辊的磨损及其对板形的影响

分析了单机架平整机轧辊的实际辊形、磨损状况,并通过运用有限元模型计算辊缝曲线的2次和4次分量研究了辊形对板形的影响.结果表明,工作辊磨损较轻,对辊形影响不大,但原始辊形与目标辊形差别较大,是产生1/4浪板形缺陷的因素之一;支持辊局部磨损较严重,但这种不均匀磨损对板形影响较小,在整个服役期内对板形的作用基本不变.     

本钢冷轧厂冷轧带钢板形控制和调节

针对本钢冷轧厂轧机的生产实际,在冷轧机压下率的分配、影响轧制稳定性因素、轧机自动方式的运用、板形仪及其它因素对带钢平直度的控制等几方面进行了优化和控制,提高了板形质量.     

Development of Neural-Based Generalized Predictive Control System of Strip Shape for a Reversal 6-High Mill

To meet the challenge of internationalcompetition a rolling mill must be able to producehigh quality products effectively.As an importantpart of quality control and productivity increase,control of cross- sectional shape in cold rolling ofthin steel strip has become an important issue.Thecontrol issue is intractable because the process ishighly non- linear,depending on the coupling effectsof many process parameters such as variation of thestrip materials and their geometries,rolltemperature an…     

宽带钢热连轧机板形板厚增益调度解耦控制

针对板形板厚综合控制的耦合问题,通过分析板形控制系统需要先后投入平坦度反馈控制和动态凸度控制的综合系统特性,采用前馈补偿综合法设计解耦网络以完成动态轧制过程的板形板厚解耦控制.结合1 700mm热连轧机实际控制系统,提出采用板形板厚增益调度解耦控制方法适应板形板厚耦合特性随实际轧制条件变化的应用需要,建立的增益调度函数集已在大型工业轧机得到验证与应用.     

热轧带钢局部硬度对冷轧带钢板形的影响

考虑轧件材质横向差异对冷轧带钢板形的影响,采用末架轧机出口带材横向厚度分布和板形作为验证模型精度的指标,定量研究了热轧来料局部硬度对冷轧带钢板厚和前张应力分布的影响程度及规律,通过与现场实测数据的对比,证明该模型提高了轧后板形的计算精度。研究结果显示,局部硬度对冷轧带材的张应力分布影响显著,附加张应力与硬度峰高度成正比,给出了冷连轧过程中轧后带材附加厚度和附加张应力与热轧来料局部硬度的关系。     

Control Strategies of Asymmetric Strip Shape in Six-High Cold Rolling Mill

 It is a complicated problem for cold-rolled strip to improve asymmetric strip shape in strip production. A roll system and strip coupled model of six-high cold rolling mill was established with finite element method to estimate the effect of intermediate roll shifting, tilting, symmetric and asymmetric bending technologies on strip profile. To reduce asymmetric defects of strip shape as much as possible, some control strategies were proposed, including tilting and asymmetric bending of intermediate roll and work roll. The combinations of these three control strategies can effectively eliminate asymmetric strip shape defects. Finally, the closed-loop control model of asymmetric flatness at the last stand was given, and the flatness control system with the function of asymmetric strip shape control was also designed for cold tandem mill.     

宽带钢热连轧机组的板形方程

以工业轧机为对象,建立了实用的板形方程即凸度传递模型.该方程能反映热连轧板形生成及控制的特点,并满足热连轧机组板形控制的需要.同时给出了建立板形方程所需的一整套完整分析工具.取样数据与该模型仿真计算结果的对比表明,该模型是可行的.     

Compensation Model For Shape Measuring of Cold Strip Rolling

 The shape meter is interfered by some unavoidable factors in the process of cold strip shape measuring, so the measuring results can not reflect the ture shape and the measuring precision is low. In this paper, The influence of the measuring results is detailed analysed, which is influenced by the measuring error of strip edges、the transverse temperature difference of strip、the shape detection roller deflection and the shape of strip coil, The corresponding compensation models are established. And a cold strip mill is calculated as an example, gaines some disciplinarian cognitions.     

A Fuzzy Shape Control Method for Stainless Steel Strip on Sendzimir Rolling Mill

 The strip shape in the stainless steel process has made an issue of the strip quality. The objective of the shape control is to minimize the shape deviation and to maintain symmetrical shape patterns in the lateral direction. The method of the shape recognition employs the least square method. The shape deviation is controlled by the fuzzy shape controller (FSC). The experiments have been performed online for various stainless materials, thicknesses, and strip widths. The test results show very efficient performances in respect of stable target tracking and symmetrical and minimal fluctuation of the strip shape.     

济钢1700 mm热带钢轧机的板形设定控制模型

济钢1700 mm热连轧是新建投产的宽带钢生产线,其F2-F6精轧机组装备有工作辊弯辊和窜辊技术.针对这种典型机型,在大量有限元模拟计算的基础上,开发了相应的板形设定控制模型,包括工作辊综合辊形(初始辊形、磨损辊形和热辊形之和)计算模型、支承辊综合辊形计算模型、窜辊设定计算模型和弯辊力设定计算模型等.在经历了系统设计、程序编写、离线调试、在线调试后,板形设定控制模型投入稳定运行,所有考核规格的凸度控制精度超过96%.在同宽轧制长度超过70 km的轧制单位内,各机架弯辊力设定结果能够自动适应带钢厚度和钢种的变化,且凸度控制精度超过95%.     

冷连轧机变接触支承辊板形控制性能研究与应用

通过现场跟踪测试和生产实践发现武钢1700冷连轧机组 "酸轧联机"改造工程中存在常规凸度辊形配置方案不合理,由此引起了薄规格轧制的工作辊"压肩"现象和轧制过程欠稳定导致成品板形质量欠佳等问题.采用二维变厚度有限元方法建立辊系弹性变形仿真模型,研制了酸轧联机条件下的VCR变接触支承辊,经过工业轧机现场轧制已成功投入1700冷连轧机实际应用.现场应用表明:改善了轧机板形调控性能,提高了带钢板形质量,增强了薄规格品种轧制能力,支承辊辊形自保持性较好.