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外文翻译--激光切割陶瓷砖的速度:理论和经验值的比较.doc

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外文翻译--激光切割陶瓷砖的速度:理论和经验值的比较.doc

徐州工程学院毕业设计外文翻译学生姓名学院名称机电工程学院专业名称机械设计制造及其自动化指导教师原文LasercuttingspeedsforceramictileatheoreticalempiricalcomparisonI.BlackDepartmentofMechanicalandChemicalEngineering,HeriotWattUniversity,Riccarton,EdinburghEH144AS,UKReceived21October1997accepted24March1998AbstractThispaperpresentsacomparisonoftheoreticallypredictedoptimumcuttingspeedsfordecorativeceramictilewithexperimentallyderiveddata.Fourwellestablishedtheoreticalanalysesareconsideredandappliedtothelasercuttingofceramictile,i.e.RosenthalsmovingpointheatsourcemodelandtheheatbalanceapproachesofPowell,SteenandChryssolouris.Thetheoreticalresultsaresubsequentlycomparedandcontrastedwithactualcuttingdatatakenfromanexistinglasermachiningdatabase.Empiricalmodelsdevelopedbytheauthoraredescribedwhichhavebeensuccessfullyusedtopredictcuttingspeedsforvariousthicknessesofceramictile.1998ElsevierScienceLtd.Allrightsreserved.KeywordsCO2laserCeramicmaterialsAdvancedcuttingprocessesLasermodelingCuttingspeeds1.ListofsymbolsAAbsorptivityaThermaldi.usivitym2/sCSpecificheatJ/kgKdCuttingdepthmmEcutSpecificcuttingenergyJ/kgkThermalconductivityW/mKJLaserbeamintensityW/m2LLatentheatofvaporisationJ/kglLengthofcutmmnCoordinatenormaltocuttingfrontPLaserpowerWPbLaserpowernotinteractingwiththecuttingfrontWQHeatinputJ/sRRadialdistancemmrBeamradiusmmsSubstratethicknessmmScritCriticalsubstratethicknessmmTTemperatureCT0AmbienttemperatureCTPPeaktemperatureCTSTemperatureattopsurfaceCtTimesVCuttingspeedmm/minVoptOptimumcuttingspeedmm/minwKerfwidthmmX,Y,ZCoordinatelocationx,y,zCoordinatedistancemmConductivelossfunctionRadiativelossfunctionConvectivelossfunctionAnglebetweenZcoordinateandxcoordinateradnCoordinateparalleltobottomsurfaceAngleofinclinationofcontrolsurfacew.r.t.XaxisradvCouplingcoecientTranslatedcoordinatedistancemmDensitykg/m3Angleofinclinationofcontrolsurfacew.r.t.Yaxisrad2.IntroductionLasercuttingofadecorativeceramictilehasitsownsetofcharacteristicproblemsincludingburnout,striations,drossandoutofflatness,whichallaffectthefinishqualityofacutedge13.Atypicalcutmayhavesomeorallofthesefeaturesdependingonthetypeofceramictilebeingprocessedandonthesettingofthevarioussetupparameters.Inaproductionenvironment,cuttingspeedsneedtobeoptimisedinordertoreduceincuttimeswithouttoomuchsignificantdegradationofcutedgequality.AnoptimumcuttingspeedcanbedefinedasthatwhichwillproducefullthroughcuttingFTCwithminimalmicrocrackingbothinthesurfaceglazeandinthetilesubstrate.Therefore,itcanbearguedthatthecuttingspeednecessarytoraiseapproximatelyacuboidofmaterialofdimensionsl,wandstothematerialsmeltingorfusiontemperaturewouldbeequaltothecuttingspeedthatwilljustcutthematerialhighercuttingspeedswillnotallowFTCandontheotherhandslowercuttingspeedswillresultinthematerialabsorbingmoreheatandreachinghighertemperaturesthanisnecessarytocutthetile.Thesehighertemperatureswillalsoresultingreaterthermalgradientsandresidualstresses,withthesubsequentproblemsofmicrocrackinginthesurfaceglazetogetherwithexcessdross.Striationmarkswillalsobeexaggeratedatslowercuttingspeedsandthiswillalsoreducecutfinishquality.ItshouldalsobenotedthatthevarioustheoreticalapproachesoutlinedinthispaperrelateonlytolasercuttingincontinuouswaveCWmode.3.Theoreticalapproaches3.1.CalculatingVoptusingmovingpointheatsourceAnalysisAtitssimplestlevel,lasercuttingcanbeconsideredtobeamovingpointheatsourceproblemwherethepointheatsourceisassumedtobethelaserbeamfocusedonthematerialtobecutmovingataconstantcuttingspeed.Therefore,itisnotunreasonabletoutilisetheheatflowsolutionsdeterminedbyRosenthalandasappliedbyEasterling4.InthisanalysisitisassumedthattheenergyofthecuttingsourcemoveswithconstantspeedalongtheXaxisofafixedrectangularcoordinatesystemasshowninFig.1.

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