超宽冷连轧机带钢复杂板形的特征分析与控制

发布时间：2018-04-14 01:17

本文选题：超宽冷连轧机 + 板形检测　；参考：《北京科技大学》2015年博士论文

【摘要】：冷轧带钢是钢铁工业的高端产品之一,广泛应用于汽车、家电、建筑等行业,板形质量受到国内外冷轧带钢生产单位持续的高度关注,一直是企业与科研人员努力提升的重要任务。以2180mm冷连轧机为代表,可轧宽度超过1800mm的超宽带钢冷连轧机的出现,为板形问题的研究与控制提出了新的课题。超宽轧机所轧带钢表现出的板形缺陷,具有起浪区域多,板形成分复杂的特点,虽然有弯辊、窜辊、精细冷却等丰富的板形控制手段,但依然无法对其进行有效的控制,成为生产中亟待解决的技术难题。板形问题分析与控制是板带轧制领域的前沿问题,涉及弹塑性变形、热变形、板形检测及屈曲变形等理论。本文结合2180mm冷连轧机的生产实际,利用解析分析、数值仿真、试验研究等多种手段,对非接触式板形仪测量准确性及目标曲线、超宽轧机带钢板形特征、轧机板形控制能力以及超宽轧机复杂板形缺陷控制等内容进行了研究,主要研究工作及取得的成果如下： (1)建立了带钢与气流间的流场分析、带钢受迫振动有限元仿真模型,确定了激振力对板形检测结果沿带钢宽度方向的影响规律,给出了板形测量误差补偿量的计算方法；通过带钢横向温度的测量与分析,给出2180mm冷连轧机温度应力补偿量的计算方法,并总结了相应目标曲线的确定方法。针对实物板形缺陷分析问题,提出了板形仪检测结果与实物板形的跟踪统计方法,发现2180mm冷连轧机板形缺陷形式以边中复合浪和中浪为主。 (2)考虑板形仪传感器布置不均的影响,提出了板形综合平坦度计算新方法,使具有不同板形仪配置生产线间板形质量更具可比性。为解决综合平坦度指标无法体现具体板形缺陷类别的问题,提出了含三次板形基模式的板形模式识别方法,对超宽轧机的板形缺陷进行了初步分析,所得结果与实物板形跟踪结果相对应。为对超宽轧机板形特征进行更深入的分析,利用数据挖掘理论,提出了基于网格和密度的板形特征聚类分析方法,采用该方法对2180mm冷连轧机带钢板形进行了分析,发现该轧机带钢边部板形具有显著的局部特征,并给出了具体函数表达方法,为冷轧板形问题的分析与研究提供了新的思路与方法。 (3)在借鉴“大数据理论”相关思想的基础上提出了轧制过程海量工艺参数的分析方法,对工艺参数进行分析后明确了2180mm冷连轧机的工作状态。结合生产实际,建立了辊系与轧件一体化的弹塑性有限元模型,对2180mm冷连轧机轧制过程进行了仿真计算,利用凸度调节域法和效应函数法对轧机板形调控能力和控制特性进行了全面分析,揭示了超宽冷连轧机复杂板形缺陷难以控制的原因在于不具备调节效果与板形缺陷特征相似性较高的控制手段,提出了超宽轧机复杂板形缺缺陷难以控制的分析方法,为超宽轧机的板形控制提供了改进方向。 (4)在对带钢板形特征及超宽轧机板形控制能力深入研究的基础上,提出了适用于超宽轧机的辊形优化设计方法,并针对2180mm冷连轧机对具有突出边部特征的板形缺陷难以控制的特点,设计了具有局部边浪控制能力的变凸度中间辊辊形。对新辊形进行了工业试验,取得了较为明显的边部板形缺陷控制效果,证明了所提出辊形设计方法的可行性与有效性。
[Abstract]:Cold - rolled strip steel is one of the high - end products of iron and steel industry . It has been widely used in automobile , household appliances , buildings and other industries . It is an important task for enterprises and researchers to improve .

The analysis and control of the plate - shaped problems is a leading problem in the field of plate - strip rolling , which involves the theory of elastic - plastic deformation , thermal deformation , plate shape detection and buckling deformation . In this paper , the accuracy and the target curve of the non - contact plate - shaped instrument , the shape characteristics of the strip steel plate , the control ability of the rolling mill and the control of the complex plate shape defect of the ultra - wide mill are studied by means of analytical analysis , numerical simulation and experimental research .

( 1 ) The flow field analysis between the strip steel and the air flow is established , the finite element simulation model of the forced vibration of the strip steel is established , the influence law of the exciting force on the plate shape detection result along the width direction of the strip steel is determined , and the calculation method of the compensation amount of the plate shape measurement error is given ;
Based on the measurement and analysis of the transverse temperature of strip steel , the calculation method of temperature stress compensation of 2180mm cold continuous rolling mill is given , and the determination method of the corresponding target curve is summarized . According to the problem of plate shape defect analysis , this paper presents a method of tracking and statistics of the results of plate shape and the shape of physical plate . It is found that the form of plate shape defect of 2180mm cold continuous rolling mill is mainly in the form of composite wave and medium wave in the edge .

( 2 ) In order to solve the problem of plate shape defect classification , a new method of plate shape pattern recognition based on grid and density is proposed for solving the problem of plate shape defect classification .

( 3 ) Based on the idea of " Big Data Theory " , an analysis method of mass process parameters for rolling process is put forward . The working state of 2180mm cold continuous rolling mill is defined after the analysis of process parameters . The rolling process of 2180mm tandem rolling mill is simulated and calculated by means of convexity adjusting domain method and effect function method .

( 4 ) On the basis of the deep research on the strip shape characteristic and the shape control ability of the ultra - wide rolling mill , a roll shape optimization design method suitable for the ultra - wide rolling mill is put forward , and the variable - crown intermediate roll shape with local edge wave control capability is designed aiming at the characteristics of difficult control of the plate shape defect with the characteristic of the protruding edge part of the 2180mm cold continuous rolling mill . The new roll shape is industrially tested , and the obvious edge - shape defect control effect is obtained , and the feasibility and the validity of the proposed roll - shaped design method are proved .

【学位授予单位】：北京科技大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TG335.12

【参考文献】