考虑实际边界条件的辊式淬火过程温度场数值模拟  

Numerical Simulation of Temperature Field in the Roller Quenching ProcessConsidering Actual Boundary Conditions

作　　者：杨一 庞玉华[1,2] 孙琦 董少若[1,2] 刘东 YANG Yi;PANG Yuhua;SUN Qi;DONG Shaoruo;LIU Dong(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Metallurgical Engineering Technology Research Center,Shaanxi Province,Xi'an 710055,China;School of Materials,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]陕西省冶金工程技术研究中心,西安710055 [3]西北工业大学材料学院,西安710072

出　　处：《材料导报》2022年第15期175-181,共7页Materials Reports

基　　金：陕西省重点研发计划(2020GY-253)。

摘　　要：本工作以N800CF辊式淬火实际工况为研究对象,采用Fluent有限元分析软件,基于对淬火机内缝隙、高密Ⅰ、高密Ⅱ等不同类型喷嘴射流换热边界条件的计算及实验验证。为考虑沸腾传热的影响引入影响系数对射流换热边界进行修正,确立了准确的换热边界条件。以每个喷嘴作用区域为独立传热单元,建立了温度场仿真模型,实现了对钢板任意位置温度的预测。结果表明:不同喷嘴射流换热边界条件经0~0.62相关影响系数修正后,计算温度与实测温度的最大误差不超过1.25%,辊式淬火过程中,钢板表面呈现周期性锯齿状降温过程,心部则呈现连续平稳的降温过程,淬后钢板边部温度较低,其余部分温度分布均匀;在高压段,钢板快速冷却,但内部温度梯度较大,最大温差高达743.6℃,是辊式淬火过程调控的关键。This work defined accurate heat transfer boundary conditions,took each nozzle's action area as an independent heat transfer unit,established a temperature field simulation model,and realized the prediction of temperature at any position of steel plate,by means of taking the actual working conditions of N800CF roller quenching as the research object,adopting Fluent finite element analysis software,based on the calculation and experimental verification of the jet heat transfer boundary conditions of different types of nozzles such as the internalslit of the quenching machine,high density I,high densityⅡ,etc.,and considering that the introduce of the influence of boiling heat transfer affects coefficient to correct the jet heat transfer boundary.The results show that the jet heat transfer boundary conditions of different nozzles are corrected by the correlation coefficient of 0—0.62,and that the maximum error between the calculated temperature and the measured temperature does not exceed 1.25%.During the roller quenching process,the surface of the steel plate exhibits a periodic zigzag cooling process,while the core area presents a continuous and stable cooling process,the edge temperature of the steel plate after quenching is low,and the temperature distribution of the rest is even;the steel plate cools down rapidly in the high pressure section,but its internal temperature gradient is large,with a maximum temperature difference 743.6℃,which is the key point to the roller quenching process control.

关 键 词：辊式淬火机 射流换热边界 沸腾传热 温度场 

分 类 号：TG156.34[金属学及工艺—热处理]