SI-FLAT板形仪激振频率设定  

Setting of Excitation Frequency of SI-FLAT Shapometer

作　　者：杨光辉[1] 张杰[1] 曹建国[1] 黄桥宝 贾生晖[2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]武汉钢铁(集团)公司冷轧厂,武汉430083

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第10期871-878,共8页Journal of Tianjin University：Science and Technology

基　　金：北京高等学校青年英才计划资助项目(YETP0369)

摘　　要：SI-FLAT板形仪是国内宽带钢冷连轧机首次采用的非接触式工业用板形仪,但实际使用过程中发现,对于常轧规格的带钢,其激振频率设定始终为同一固定值,激振力仅随张应力的变化而变化,导致板形控制不稳定,激振频率的设置严重影响着板形检测的精度.本文在分析现场实际生产数据的基础上,提出了激振频率的设置应该遵循的两个基本原则,即振幅控制原则和检测间隔控制原则.为了对带钢振动进行固有频率和受迫振动振幅的分析和计算,采用大型有限元软件ANSYS12.0建立了带钢振动仿真模型,分析了带钢板形、宽度、厚度、张应力等因素所导致的带钢固有频率波动对带钢振幅的影响.研究发现,张应力和板形对带钢固有频率的影响较大.最后,基于振幅控制原则和检测间隔控制原则提出了可行性方案,即通过限制最小张应力,减小板形对测量结果的影响;同时为了控制最小检测间隔,便于对板形的在线控制,激振频率的大小应根据带钢速度进行调节设定.SI-FLAT shapometer is a non-contacting industrial shapometer which was firstly used in domestic wide-strip tandem cold rolling mills. It was found during production that excitation frequency was set as a fixed value for often rolled strips of different specifications and that excitation force only changed with tensile stress,which led to the unstable shape control of strip. Excitation frequency had a great influence on the detection precision of strip shape. Based on the analysis of production data,two basic principles were put forward,which are amplitude control princi-ple and detection internal control principle. For analyzing and calculating the natural frequency and amplitude of forced vibration of strip,the vibration simulation model was built by the finite element software ANSYS12.0. With the model,the influences of some factors,such as strip shape,width,thickness and tensile stress,on the fluctua-tion of natural frequency were analyzed. It was found that tensile stress and shape had great effects on the natural fre-quency of strip. Finally,the feasible project was put forward based on the amplitude control principle and the detec-tion internal control principle. Through limiting the minimum tensile stress,the influence of shape on the measure-ment result could be reduced,and for controlling the minimum detection interval so as to improve the on-line shape,the excitation frequency should be adjusted according to the speed of strip.

关 键 词：冷轧带钢 板形检测 激振频率 振幅 检测间隔 

分 类 号：TG333.71[金属学及工艺—金属压力加工]