板宽对板形影响的研究
发布时间：2018-10-08 18:54
【摘要】：板形是板带材的重要指标之一,另外一个指标是板厚,板厚控制技术已经非常成熟,但板形板厚控制是一个复杂的变量系统,板形控制和板厚控制之间存在着很强的耦合关系,厚度控制精度的提高也直接导致了板形控制的难题。虽然HC轧机、CVC轧机、PC轧机等已经在工业生产中较为普及,但是这些都只是通过轧钢设备的优化来改善板形的,对于板带材本身因素的影响研究较为欠缺,但这些因素是不可忽略的,甚至会对轧制的最终板形产生很大影响。目前对于板带轧制的有限元仿真模型有很多,但是,许多学者在模拟过程中会把很多条件理想化,存在很多实际问题的简化或者假设,这会对计算精度及板形变化产生较大的影响。因此本文在进行大量实验的基础上建立了实验室四辊可逆冷轧机有限元计算模型,本模型的特点是把辊身以及辊径设置为弹塑性体,从而更好的和实际工况相吻合,并对比分析了实验数据和模拟数据,得出了板宽对轧后板形的影响规律;并通过所建立的有限元模型,进一步研究了板宽对轧辊压扁的和轧辊挠曲变形的影响,这是仅通过实验无法获得的,仅通过模拟又无法保证其准确性的,这正是本文建立出和实验数据相一致的仿真模型的意义所在。本文的主要研究内容和结果如下:(1)在实验所取的速度范围内,轧机纵向刚度随轧制速度的增大是减小的,而轧机横向刚度随轧制速度的变化不是单调的,而是波动的,在轧制速度为0.2m/s时横向刚度和纵向刚度的组合最优;由于板宽较大时,轧机的横向刚度和纵向刚度均较大,所以轧机在轧制和辊身长度相接近的轧件时轧制的板形最良好,厚度的控制也最准确;(2)在实验所研究的板宽范围内,轧机的纵向刚度和横向刚度均随板宽的变大是呈增加的趋势,但增加的形式及趋势有所不同。其成因是轧制力及轧制力的分布综合作用的结果;(3)在轧件板宽范围内,工作辊弹性压扁较大,在板宽范围之外,轧辊的弹性压扁迅速减小,并且板宽在180mm范围内时,工作辊的弹性压扁是随着板宽的增大而增大的,在板宽为220mm时,工作辊的弹性压扁减小,并且支承辊压扁的趋势和工作辊总体上具有一致性,板宽为60mm时是个特例;(4)随着板宽的增加,支撑辊的挠度和工作辊的挠度变化趋势是一致的,即在板宽100mm到220mm的范围内,工作辊和支撑辊的挠度都是随着板宽的增加而增加的,但板宽较窄时会有特例出现。
[Abstract]:The flatness is one of the important indexes of sheet and strip, and the other index is the thickness of the plate. The control technology of the thickness of the plate is very mature, but the control of the thickness of the plate is a complicated variable system, and there is a strong coupling relationship between the shape control and the thickness control. The improvement of thickness control precision also directly leads to the difficulty of shape control. Although the HC mill and PC mill have been popularized in the industrial production, but these are only through the optimization of the rolling equipment to improve the shape of the plate, the research on the influence of the plate and strip itself factors is relatively lacking. However, these factors can not be ignored, and even have a great impact on the final shape of rolling. At present, there are many finite element simulation models for strip rolling, but many scholars will idealize a lot of conditions in the simulation process, and there are many practical problems simplified or hypothesized. This will have a great impact on the calculation accuracy and shape change. On the basis of a large number of experiments, the finite element model of the four high reversible cold rolling mill is established in this paper. The characteristic of the model is that the roll body and the diameter of the roll are set up as the elastoplastic body, which is in better agreement with the actual working conditions. The experimental data and simulation data are compared and analyzed, and the influence of plate width on the shape of the plate after rolling is obtained, and the effect of plate width on roll flattening and roll deflection is further studied through the established finite element model. This can not be obtained only through experiments, but also can not be guaranteed by simulation. This is the significance of the simulation model which is consistent with the experimental data in this paper. The main contents and results of this paper are as follows: (1) the longitudinal stiffness of the rolling mill decreases with the increase of the rolling speed, while the change of the transverse stiffness of the rolling mill with the rolling speed is not monotonous, but fluctuating. When the rolling speed is 0.2m/s, the combination of transverse stiffness and longitudinal stiffness is optimal, because the transverse stiffness and longitudinal stiffness of the rolling mill are both larger when the plate width is larger, so the rolling mill has the best shape when rolling the workpiece with the same length as the roll body. The thickness control is also the most accurate. (2) in the range of plate width studied in the experiment, the longitudinal and transverse stiffness of rolling mill increase with the increase of plate width, but the increasing form and trend are different. The cause of formation is the comprehensive effect of the rolling force and the distribution of the rolling force. (3) the elastic flattening of the work roll is larger in the wide range of the workpiece, and the elastic flattening of the roll decreases rapidly outside the wide range of the plate, and the width of the plate is within the range of 180mm. The elastic flattening of the work roll increases with the increase of the plate width. When the plate width is 220mm, the elastic flattening of the work roll decreases, and the trend of the flattening of the backup roll is consistent with the work roll in general. (4) with the increase of plate width, the deflection of the supporting roll is consistent with the deflection of the work roll, that is, in the range from 100mm to 220mm, the deflection of the work roll and the supporting roll increases with the increase of the plate width. However, there will be a special case when the width of the plate is narrower.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG335
本文编号：2257893
[Abstract]:The flatness is one of the important indexes of sheet and strip, and the other index is the thickness of the plate. The control technology of the thickness of the plate is very mature, but the control of the thickness of the plate is a complicated variable system, and there is a strong coupling relationship between the shape control and the thickness control. The improvement of thickness control precision also directly leads to the difficulty of shape control. Although the HC mill and PC mill have been popularized in the industrial production, but these are only through the optimization of the rolling equipment to improve the shape of the plate, the research on the influence of the plate and strip itself factors is relatively lacking. However, these factors can not be ignored, and even have a great impact on the final shape of rolling. At present, there are many finite element simulation models for strip rolling, but many scholars will idealize a lot of conditions in the simulation process, and there are many practical problems simplified or hypothesized. This will have a great impact on the calculation accuracy and shape change. On the basis of a large number of experiments, the finite element model of the four high reversible cold rolling mill is established in this paper. The characteristic of the model is that the roll body and the diameter of the roll are set up as the elastoplastic body, which is in better agreement with the actual working conditions. The experimental data and simulation data are compared and analyzed, and the influence of plate width on the shape of the plate after rolling is obtained, and the effect of plate width on roll flattening and roll deflection is further studied through the established finite element model. This can not be obtained only through experiments, but also can not be guaranteed by simulation. This is the significance of the simulation model which is consistent with the experimental data in this paper. The main contents and results of this paper are as follows: (1) the longitudinal stiffness of the rolling mill decreases with the increase of the rolling speed, while the change of the transverse stiffness of the rolling mill with the rolling speed is not monotonous, but fluctuating. When the rolling speed is 0.2m/s, the combination of transverse stiffness and longitudinal stiffness is optimal, because the transverse stiffness and longitudinal stiffness of the rolling mill are both larger when the plate width is larger, so the rolling mill has the best shape when rolling the workpiece with the same length as the roll body. The thickness control is also the most accurate. (2) in the range of plate width studied in the experiment, the longitudinal and transverse stiffness of rolling mill increase with the increase of plate width, but the increasing form and trend are different. The cause of formation is the comprehensive effect of the rolling force and the distribution of the rolling force. (3) the elastic flattening of the work roll is larger in the wide range of the workpiece, and the elastic flattening of the roll decreases rapidly outside the wide range of the plate, and the width of the plate is within the range of 180mm. The elastic flattening of the work roll increases with the increase of the plate width. When the plate width is 220mm, the elastic flattening of the work roll decreases, and the trend of the flattening of the backup roll is consistent with the work roll in general. (4) with the increase of plate width, the deflection of the supporting roll is consistent with the deflection of the work roll, that is, in the range from 100mm to 220mm, the deflection of the work roll and the supporting roll increases with the increase of the plate width. However, there will be a special case when the width of the plate is narrower.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG335
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