整辊式板形仪通道间信号耦合系数的精确获取  

Accurate acquisition of channel coupling coefficients of whole roller flatness meter

作　　者：于华鑫 张桐源 廖霜 杨昇 刘宏民 YU Huaxin;ZHANG Tongyuan;LIAO Shuang;YANG Sheng;LIU Hongmin(National Engineering Research Center for Equipment and Technology of Cold Rolling Strip,Yanshan University,Qinhuangdao 066004,Hebei,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《钢铁》2023年第7期89-98,共10页Iron and Steel

基　　金：国家自然科学基金区域创新发展联合基金资助项目(U21A20118);国家重点研发计划资助项目(2021YFB3401004)

摘　　要：整辊无缝式板形仪通过轴向打通孔安装传感器,其辊体表面为整体无接缝的结构,当对其某一检测通道施加载荷时,不仅当前通道有信号输出,邻近通道的信号因为力的传递也会产生显著变化,即通道间存在信号耦合现象。板形仪在实际工作过程中,带材在张力的作用下,形成沿带材横向分布的径向压力分布作用在板形辊上,由于通道耦合作用,会导致板形辊每个通道检测到的压力不等于带材对其表面的作用力。整辊式板形仪由于通道耦合会造成显著的板形检测误差,影响板形检测精度,必须对板形检测信号进行解耦,还原真实的检测信号,才能得到真实的板形。实现解耦的关键是精确获得耦合系数,耦合系数可以通过理论计算、有限元模拟和标定试验3种方法获得。以650 mm试验板形辊为研究对象,首先通过接触力学弹性半空间理论计算和有限元仿真分别得到了其对应的耦合系数;然后通过标定试验得到了标定数字矩阵,建立了由标定数字矩阵计算耦合系数的标定计算模型,并得到了标定耦合系数;最后对3种耦合系数进行了对比分析。通过对比发现,理论计算的耦合系数较有限元模拟和标定试验值偏大,主要是因为弹性半空间假设与辊体实际边界条件之间存在差别;有限元模拟的耦合系数与标定试验的耦合系数比较接近,但数据过于平稳,过于理想化,无法考虑到辊体加工精度和传感器灵敏度等一系列误差和影响因素。由于标定试验本身就是针对真实板形辊进行的,标定试验得到的数据包含了辊体和传感器等因素的影响,在方法合理的前提下,得到的耦合系数是最精确的。The whole roller seamless flatness meter is equipped with sensors through a hole in its axial direction.Since the surface of the roll body is a whole seamless structure,when a load is applied to one of its detection channels,not only the current channel,but also the signals of adjacent channels will change significantly due to the force transmission,which is the signal coupling phenomenon between channels.In the actual working process of the flatness meter,under the action of tension,transverse radial pressure distribution along the strip is formed and acted on the detection roll.Due to the channel coupling effect,the pressure detected in each channel of the detection roll is not equal to the actual force exerted by the strip on its surface.Due to the channel coupling,the flatness detection error of the flatness meter will be significant,which will affect the accuracy of the flatness detection.The flatness detection signal must be decoupled to restore the real detection signal to obtain the real flatness distribution.The key to achieve decoupling is to accurately obtain the coupling coefficient,which can be obtained by three methods:theoretical calculation,finite element simulation and calibration test.The 650 mm test roll is taken as the research object.Firstly,the corresponding coupling coefficients are obtained by theoretical calculation of contact mechanics elasticity half-space theory and finite element simulation respectively.Then the calibration digital matrix was obtained through calibration experiments.The calibration calculation model was established to calculate the coupling coefficient from the calibration digital matrix and the calibration coupling coefficient was obtained.Finally,the three groups of coupling coefficients are compared and analyzed.By comparison,it is found that the coupling coefficient calculated by the theory is larger than that of the finite element simulation and calibration test,mainly because of the difference between the elastic half-space hypothesis and the actual boundary con

关 键 词：整辊式板形仪 耦合系数 弹性半空间 有限元分析 标定试验 

分 类 号：TG333[金属学及工艺—金属压力加工]