276-paper-fem analysis of deformation in heavy plate

1、FEMAnalysisofPlanViewDefmationinHeavyPlateSihaiJIAO1JianguangYUAN1(1BaoshanIron889FujinRoadBaoshanDistrictShanghaiChina)Abstract:Indertoinvestigatetheplanviewdefmationbehaviofplatesteelduringheavyplaterollingprocessacter

2、izedwithturningreversingpassestheAbaquscommercialelasticplasticfiniteelementcodewasemployedtodotheanalysistheresultswereverifiedwithlabatysteelrollingthemeasurementofindustrialproducedplate.ExperimentFEManalysisresultssh

3、owthatbothheadtailshapescanbedescribedwithparabolicfunctionsthesideshapewithexponentialfunctionsinplaterolledwithoutturning.Intheplateexperiencedwithturningrollingneithertheparabolicfunctionntheexponentialfunctionissuita

4、blefthedeionofplanviewwhilecomplicatedmodelsareneededtoacterizethetypicallocalnarrowinwidth.KeyWds:HeavyPlatePlanViewFEMModeling1.IntroductionInheavyplaterollingoneofthemostimptantfactsaffectingtheyieldoftheplatesisthepl

5、anviewcontrolfwhichmanymethodssuchasMASrollingDogBoneRollingetc.havebeendevelopedtoreducethecropinbothendssides[12].Highaccuracyofsuchcontrolmethodsdependsonthepredictionofthefinalplanviewoftheplatesthathavebeendefmedthr

6、oughouttherollingprocessincludingsizingbroadeningfinishing.Indertoperfmsuchpredictioninatraditionalwayallkindofempiricalfmulashavebeendevelopedunderdifferentrollingconditionsthroughphysicalsimulationrollingmeasuredsimpli

7、fiedtoagreatextentftheconnivanceofcalculation[34].Thesefmulashavebeenwidelyusedintheheavyplatemillsquitehighyieldhasbeenachieved.Inthepracticeofheavyplaterollinghoweversomeplanviewdefectsaslocalnarrowingcannotbepredicted

8、byusingthetraditionalfmulasthennocontrolcouldbeputontheplate.IncurrentwktheFEManalysishasbeenusedtomakesuchpredictionwithbothlabatialindustrialconditions.2.ExperimentalConditionsFEMModelling2.1.ExperimentalConditionsLaba

9、tyexperimentswerecarriedoutontheф750pilotmillinBaosteelResearchInstitute.ThreeHSLAsteelswithwithoutniobiumtitaniummicroalloyedweremeltedwith500kgvacuuminductionfurnacecastinto70ingots.Theingotswerethenfgedcutinto120mm270

10、mm~290mmslabs.Theslabswererolledinto20mm300mmlengthplatesin79passeswithoutturning.Theplanviewoftheplateswasmeasuredwhentheycooleddowntoroomtemperature.Theplanviewofanindustrialproducedtheplatewasalsomeasuredafterrollingc

11、oolingtoroomtemperatureinBaosteelHeavyPlateMill.Theplatehasthesizeof80mm2260mm13950mmwasrolledfrom380mm1550mm4280mmslabin15passeswithtwoturns.unsteadydefmationismainlylocalizedclosetothecneroftheplate.Asaresulttheendshap

12、eissegmented.Similarlythesideshapeshouldalsobedescribedwithsegmentedfunctions.Inpracticalrollingprocesshoweverthelengthofplateismuchlagerthanitswidthsotheunsteadyendrollinghasverysmalleffectontheinnerpartinrollingdirecti

13、on.x=0.0048y20.1307y0.691x=0.058y216.79y1304.60408012016004080120160200LongitudialPosition(mm)1301401501601700200400600800LongitudinalPosition(mm)TransversalPosition(mm)y=0.088e0.015(x170)a)Endshapesb)SideshapesFigure2.E

14、xamplefunctionfplanview3.2.PlanViewofPlateRolledwithTurningIntheindustrialproductionprocesstheturningrollingisacommonpractice.Theplanviewshapeoftheplatewithturningrollingshouldbedifferentfromtheoneoftheplaterolledwithout

15、turning.ThecommercialFEMcodewhichhasbeenprovedreliablethroughlabatyrollingexperimentwasusedtocalculationplanviewevaluationduringturningrollinginindustrywhichisnoteasytoobtainprecisemeasurementvaluesduringproduction.Figur

16、e3isoneexampleofthecalculationresultswhichcrespondstotheplatemeasuredafterrollingcoolingtoroomtemperature.Theplateturned90beferollingi.e.therollingprocessstarteddirectlyfromthebroadeningstage.1.510.500.511.57654321012345