冷却工艺对热轧带钢工作辊热膨胀的影响.pdf

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1、第21卷第4期塑性工程学报Vo1．21No．42014年8月OURNALOFPLASTICITYENGINEERINGAug．2014doi：10．3969／j．issn．1007—2012．2014．04．021冷却工艺对热轧带钢工作辊热膨胀的影响(燕山大学机械工程学院，秦皇岛066004)李兴东(燕山大学里仁学院，秦皇岛066004)单彦霞摘要：热轧带钢轧辊冷却是影响工作辊热膨胀、带钢板形和断面形状的重要因素。针对工作辊几何形状和冷却工艺，采用有限差分法对工作辊温度场和热凸度进行仿真。仿真结果表明，温度场和热凸度的计算值与实测值吻合良好。分析冷却水

2、流量、温度和分布对工作辊热膨胀及热凸度的影响表明，随着冷却水流量的增加，辊身中部热膨胀逐渐降低，而辊身端部热膨胀变化不大，热凸度减小；随着冷却水温度的升高，辊身中部和端部热膨胀都增加，且热膨胀的增加量相差很小，热凸度变化不大；随着辊身中部冷却水流量和端部冷却水流量比的增加，辊身中部热膨胀降低，而辊身端部热膨胀变化不大，热凸度减小。为热带钢轧机工作辊冷却系统改造提供了理论依据。关键词：温度场；热膨胀；冷却水；有限差分；工作辊中图分类号：TG333．1文献标识码：A文章编号：1007—2012(2014)04—0109—04Effectofcoolingp

3、rocessonthermalexpansionofworkrollabouthotrollingstripLIXing-dong(CollegeofMechanicalEngineeringofYanshanUniversity，Qinhuangdao066004China)SHANYar】-xia(LirenCollegeofYanshanUniversity，Qinhuangdao066004China)Abstract：Rollcoolingabouthotrollingstripisthekeyfactoraffectingthermalex

4、pansionofworkroll，stripshapeandprofile．Onthebasisofthegeometricalshapeandthecoolingprocessoftheworkroll，usingthefinitedifferencemethod，thetemperaturefieldandthermalcrownoftheworkrollafterrollingweresimulateThesimulationresultsindicatethatthecomputedresultsandthemeasuredresultsof

5、thetemperaturefiledandthethermalcrowncoincidebetter．Theeffectsofflux．temperatureanddis—tributionofcoolingwateronthethermalexpansionandcrownwereanalyzedbythismode1．ItiSfoundthatwiththeincreaseofcoolingwaterflux，thethermalexpansioninthemiddleofrollbodygraduallydecreases，whilethati

6、ntheendofrollbodychangeslittle，andthethermalcrowndecreases．ItiSfoundthatwiththeincreaseofcoolingwatertemperature．thethermalexpansionsinthemiddleandendofrollbodyincrease，thedifferenceoftheirincreasingvaluesislittle，andthethermalcrownchangeslittle．ItiSalsofoundthatwiththeincreaseo

7、ftheratioofcoolingwaterfluxbetweenthemiddleandendofrollbody。thethermalexpan—sioninthemiddleofrollbodydecreases，whilethatintheendofrollbodychangeslittle，andthethermalcrowndecreases．Itprovidestheoreticalfoundationforthecoolingwatermodificationofworkrollofhotstripmil1．Keywords：temp

8、eraturefield；thermalexpansion；coolingwater；fini