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外文翻译--热挤压模具的优化设计.doc外文翻译--热挤压模具的优化设计.doc -- 5 元

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1/11StressAnalysisandOptimumDesignofHotExtrusionDiesAbstractAthreedimensionalmodelofahotextrusiondiewasdevelopedbyusingANSYSsoftwareanditsseconddevelopmentlanguageANSYSparametricdesignlanguage.Afiniteelementanalysisandoptimumdesignwerecarriedout.Thethreedimensionalstressdiagramshowsthatthestressconcentrationisrathersevereinthebridgeofthehotextrusiondie,andthatthestressdistributionisveryuneven.Theoptimumdimensionsareobtained.Theresultsshowthattheoptimumheightoftheextrusiondieis89.596mm.Theoptimumradiiofdiffluenceholesare65.048mmand80.065mm.Thestressconcentrationisreducedby27.KeywordsthreedimensionalmethodmodelinghotextrusiondieoptimumdesignIntroductionWiththecontinuousimprovementoflivingstandards,betterthermalconductivityofaluminumalloyprofiles.Aluminumcomponentswidelyusedineveryaspectoflife.Therefore,thealuminumalloyextrusionprofiles,profilesofvarioustypesofradiatorshavebeenwidelyusedinelectricalappliances,machinery,andotherindustries.Variableproductsandthegrowingdiversityandcomplexityofhighprecision,theextrusionprocessisthebasisforextrusiondie.Itnotonlydeterminestheshape,size,accuracyandsurfacestate,butalsoaffecttheperformanceoftheproduct.Soextrusiondieextrusiontechnologyisthekey.Studiestoimproveextrusiondiequalityandprolongitslifespanusuallyattempttosimplify3Dfiniteelementmodelto2D,butitisonlyrightforsimplestructuralshapes.Withouta3Dfiniteelementanalysis,theresultscannotgivepracticalmanufacturinghelpandofferusefulinformation35.Inthispaper,aluminiumprofileextrusiondiewasmodeledtogetinoptimumdesign68.1SolidModelingFigure1showsthemaledieofahotextrusionplanarcombineddie.Itsexternaldiameteris227.000mm,itsheightis80.000mm.OtherparametersareshowninFig.1.Themodelingmethodisasfollows.1.1CoordinatesofP1andP5ThecoordinatesofthepointofintersectionbetweenthebeelineLykxbandthecirculararcx2y2R2are1.2CoordinatesofP2andP6ThecoordinatesoftheintersectionpointP2betweenbeelineL1ykxband2/11beelineL2yS1areThecoordinatesoftheintersectionpointP6betweenbeelineL3ykxbandbeelineL4yS1are1.3CoordinatesofP3,P4,P7,andP8P3andP1aresymmetricabouttheyaxis.P4andP2arealsosymmetricabouttheyaxis.P7andP5aresymmetricaboutthexaxis.P8andP6arealsosymmetricaboutthexaxis.1.4VariablesintheequationsInEqs.16,forpointsP1andP2,andRR1.ForpointsP5andP6,andRR2.R1,R2,T1,T2,S1,andS2arethechangerulealongtheheightHofthedieexpressedasthefunctionsR1f1z,R2f2z,T1f3z,T2f4z,S1f5z,andS2f6z,z€0,H.1.5SectionshapeatsomeheightWithlineslinkingP1P4,P5P8,withcirculararcfilletingatthepointofintersectionP1P8,thesectionshapeatsomeheightisobtained.1.6SectionshapeateveryheightHisdividedtointerfacialnumberINUMequalpartsINUMisdecidedbytheprecision,iftheINUMishigher,theprecisionisbetter.ThesectionshapeisdrawnateveryheightasshowninFig.2.3/111.7SmoothcurvedsurfaceUsingSKINcommandinANSYS,smoothcurvedsurfaceswerebuiltalongthelines.Theyarethesurfacesoftheinfluencehole.UsingtheVAitgeneratesavolumeboundedbyexistingareacommand,asolidwascreatedfromthosesurfaces.1.8SymmetryofthedieThemainbodyandkernelofthedieweredrawnusingtheBooleanoperationsofadd,subtract,etc.Fig.3.Thesymmetryofthediewasusedtoacceleratethecomputationsusinga1/4solidmodelforthefiniteelementanalysisFig.4.2ComputingModelAplanardiethatextrudesthealuminiumalloy6063AlMgSiwasusedasanexample.TheliquidoidofAlis657℃9,andthemelttemperatureofAlMg2Siis558℃.Takingtheextrusionpressureandtheproductsqualityintoaccount,theworkingtemperaturewasdeterminedtobe450℃.Thediematerialis4Cr5MoSiV1H13.Belowthe450℃,itsYoungmodulusandPossionratioare210GPaand0.25,respectively.Itsyieldstrengthis1200MPa.Thefrictioncoefficientis0.3.TheSolid923Dsolidelementwasusedtocarrythroughthefreemesh.Inordertoloadthefrictionalforcewhileextruding,thesurfaceeffectelementSurf154wasusedtoproducetheregularquadranglesFig.5.Forthe1600t4/11extruder,theextrusionintensitywascomputedusingEq.710.ThevaluesareshowninTable1.Thebridgecollapseoftentakesplaceinthedie.Anditsstrengthisdeterminedbytheheightandthedistributionofthediffluenceholes.Inthispaper,theheightHandtheradiiR1andR2ofthediffluenceholeswereusedasdesignvariablesandthemaximumequivalentpressuresmaxwasusedasthegoalfunction.ThedesignvariablerangesarelistedinTable2.3ComputedResultsFigure6istheequivalentstressdiagram.FromFig.6wecanseethatthestressislargestatthebridge,asexpected24maximumequivalentstressvaluesarelistedinTable3fromlargetosmall.Thedatashowsthatthenodalmaximumequivalentstressis1066.5MPa,whichis14.5higherthanthesecondone912.0MPa,andthatthestressconvergenceisverysevereinthebridge,thispartisapttoproducecrack.
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