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1、10532S150200218U4662018051010532S1502002182018051020180519StudyontheDesignofCoolingChannelsandHeatTransferEffectofHighStrengthSteelHotFormingMouldbyWanYuxianB.E.(NortheasternUniversity)2015AthesissubmittedinpartialsatisfactionoftheRequirementsforthedegreeofMasterofEngineeringinMechanica
2、lEngineeringintheGraduateSchoolofHunanUniversityProfessorLIUDihuiMay,20181______2I22MnB5FluentLS-DYNAFluent22MnB5IIAbstractWiththerapiddevelopmentoftheautomobileindustry,thecost,safetyperformanceandlightweightoftheautomobilehavebeenpaidgreatattention.Highstrengthsteelhasbeenwidelyusedin
3、thefieldofautopartstoimprovetheperformanceofautomobile.Becauseofthehighyieldstrengthandtensilestrengthofhighstrengthsteel,thestiffnessofthecarisgreatlyimproved.Theincreaseofstrengthcanreducetheuseofthestiffenersonthebody.Theweightofthebodyandthenumberofweldingpointsoftheweldedreinforcem
4、entaredecreasedeffectivelysoastosavethecost.Mostautomotivepartsarestampingforming,buthighstrengthsteelcan'tmeettherequirementbyordinarycoldstamping.Therefore,hotstampingisrequiredtoproducerelatedautomotivecomponents.Inthispaper,theautomobileupperbeamproducedbyhotformingnamed22MnB5high-s
5、trengthsteelistakenastheresearchobject.Thecoolingsystemofthehotformingmoldandthetemperaturechangeofthesheetduringstampingarestudied.Themaintasksareasfollows:Anewmethodisproposedtouniformtheflowrateofthethermoformingcoolingsystemtoensurethatthecoolingoftheplateisuniform.Theconcretemethod
6、istooffsetconnectingpipesofmainchanneltocontroltheflowrateofsurfacepipesandselectthebestoptimizationparametersbyorthogonaltest.Fluentisusedtoanalyzetheflowrateofthecoolingsystembeforeandafteroptimization,andthecorrespondingcoolingsystemexperimentalplatformissetup.Theresultsofsimulationa
7、ndexperimentarecomparedtoverifythefeasibilityofthemethod.Theflowandsolidheatcouplinganalysisofthemodelbeforeandaftertheoptimizationwascarriedouttoobservethetemperaturedistributionofthesheetmaterialbeforeandafterthevelocityhomogenization.Thehotstampingformingexperimentoftheupper
