热轧带钢温度场在线计算方法研究  

Research on Online Calculation Methods of Temperature Field of Hot Strip

作　　者：陈超超[1] 邵健[1] 何安瑞[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《机械工程学报》2014年第14期135-142,共8页Journal of Mechanical Engineering

基　　金：中央高校基本科研业务费专项资金(FRF-TP-11-003A);新世纪优秀人才支持计划(NCET-10-0223);北京市青年人才计划(YETP0413)资助项目

摘　　要：热连轧生产过程中,精确的带钢温度场计算模型是保证带钢板形质量、尺寸精度及组织性能的重要前提,其计算速度与精度是当前制约温度场在线计算的重要因素。在分析现有模型的基础上,考虑轧制时带钢对周围环境的热辐射、带钢与周围流体介质的对流换热、带钢与工作辊之间的热传递、带钢变形生热以及带钢与工作辊之间的摩擦生热,基于合理的物性参数和假设条件,采用二维交替差分法建立精轧区带钢温度场计算的通用算法。结合热连轧生产线的实际生产条件,运用C++建立精轧机组带钢温度场在线计算模型,得到各机架出口带钢横断面的温度分布。通过对比模型计算的宽度方向温度分布值与实际测量值,结果表明整体分布趋势一致,温差控制在15℃以内,相对偏差均值为0.56%,计算时间仅用46 ms,验证了热轧带钢温度场计算方法在线应用的可行性。Temperature field calculation of strip is an important premise of ensuring shape quality, dimensional accuracy and structure property in hot strip mills, its numerical efficiency and accuracy are the main factors that have restricted the application of online calculation. On the basis of the analysis of existing models, considering heat radiation of strip to surrounding environment, convectional heat exchange between strip and liquid medium all round, heat transmission between strip and work roll, deformation heat of strip and friction heat between strip and work roll in the process of hot rolling, based on the physical parameters and reasonable assumptions, the general algorithm of strip temperature field in finishing mill is established by using two-dimensional alternating difference method. Combined with the actual production conditions of hot strip mill, an online calculation model of strip temperature field in finishing mills is established by C＋＋ software, which can be used to calculate temperature distribution of strip cross-section out of each stand. The feasibility of online application of rapid temperature field model is validated by contrasting the transverse temperature distribution between calculation values and actual measured values, which reflects from that the overall distribution trend is consistent, the temperature difference is controlled within 15 ℃, the mean relative deviation is only 0.56%, and the computing time is only 46 ms.

关 键 词：热连轧 精轧 温度场 在线 二维交替差分法 

分 类 号：TG335[金属学及工艺—金属压力加工]