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外文翻译--热挤压模具的优化设计.doc

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外文翻译--热挤压模具的优化设计.doc

1/11STRESSANALYSISANDOPTIMUMDESIGNOFHOTEXTRUSIONDIESABSTRACTATHREEDIMENSIONALMODELOFAHOTEXTRUSIONDIEWASDEVELOPEDBYUSINGANSYSSOFTWAREANDITSSECONDDEVELOPMENTLANGUAGEANSYSPARAMETRICDESIGNLANGUAGEAFINITEELEMENTANALYSISANDOPTIMUMDESIGNWERECARRIEDOUTTHETHREEDIMENSIONALSTRESSDIAGRAMSHOWSTHATTHESTRESSCONCENTRATIONISRATHERSEVEREINTHEBRIDGEOFTHEHOTEXTRUSIONDIE,ANDTHATTHESTRESSDISTRIBUTIONISVERYUNEVENTHEOPTIMUMDIMENSIONSAREOBTAINEDTHERESULTSSHOWTHATTHEOPTIMUMHEIGHTOFTHEEXTRUSIONDIEIS89596MMTHEOPTIMUMRADIIOFDIFFLUENCEHOLESARE65048MMAND80065MMTHESTRESSCONCENTRATIONISREDUCEDBY27KEYWORDSTHREEDIMENSIONALMETHOD;MODELING;HOTEXTRUSIONDIE;OPTIMUMDESIGNINTRODUCTIONWITHTHECONTINUOUSIMPROVEMENTOFLIVINGSTANDARDS,BETTERTHERMALCONDUCTIVITYOFALUMINUMALLOYPROFILESALUMINUMCOMPONENTSWIDELYUSEDINEVERYASPECTOFLIFETHEREFORE,THEALUMINUMALLOYEXTRUSIONPROFILES,PROFILESOFVARIOUSTYPESOFRADIATORSHAVEBEENWIDELYUSEDINELECTRICALAPPLIANCES,MACHINERY,ANDOTHERINDUSTRIESVARIABLEPRODUCTSANDTHEGROWINGDIVERSITYANDCOMPLEXITYOFHIGHPRECISION,THEEXTRUSIONPROCESSISTHEBASISFOREXTRUSIONDIEITNOTONLYDETERMINESTHESHAPE,SIZE,ACCURACYANDSURFACESTATE,BUTALSOAFFECTTHEPERFORMANCEOFTHEPRODUCTSOEXTRUSIONDIEEXTRUSIONTECHNOLOGYISTHEKEYSTUDIESTOIMPROVEEXTRUSIONDIEQUALITYANDPROLONGITSLIFESPANUSUALLYATTEMPTTOSIMPLIFY3DFINITEELEMENTMODELTO2D,BUTITISONLYRIGHTFORSIMPLESTRUCTURALSHAPESWITHOUTA3DFINITEELEMENTANALYSIS,THERESULTSCANNOTGIVEPRACTICALMANUFACTURINGHELPANDOFFERUSEFULINFORMATION35INTHISPAPER,ALUMINIUMPROFILEEXTRUSIONDIEWASMODELEDTOGETINOPTIMUMDESIGN681SOLIDMODELINGFIGURE1SHOWSTHEMALEDIEOFAHOTEXTRUSIONPLANARCOMBINEDDIEITSEXTERNALDIAMETERIS227000MM,ITSHEIGHTIS80000MMOTHERPARAMETERSARESHOWNINFIG1THEMODELINGMETHODISASFOLLOWS11COORDINATESOFP1ANDP5THECOORDINATESOFTHEPOINTOFINTERSECTIONBETWEENTHEBEELINELYKXBANDTHECIRCULARARCX2Y2R2ARE12COORDINATESOFP2ANDP6THECOORDINATESOFTHEINTERSECTIONPOINTP2BETWEENBEELINEL1YKXBAND2/11BEELINEL2YS1ARETHECOORDINATESOFTHEINTERSECTIONPOINTP6BETWEENBEELINEL3YKXBANDBEELINEL4YS1ARE13COORDINATESOFP3,P4,P7,ANDP8P3ANDP1ARESYMMETRICABOUTTHEYAXISP4ANDP2AREALSOSYMMETRICABOUTTHEYAXISP7ANDP5ARESYMMETRICABOUTTHEXAXISP8ANDP6AREALSOSYMMETRICABOUTTHEXAXIS14VARIABLESINTHEEQUATIONSINEQS16,FORPOINTSP1ANDP2,ANDRR1FORPOINTSP5ANDP6,ANDRR2R1,R2,T1,T2,S1,ANDS2ARETHECHANGERULEALONGTHEHEIGHTHOFTHEDIEEXPRESSEDASTHEFUNCTIONSR1F1Z,R2F2Z,T1F3Z,T2F4Z,S1F5Z,ANDS2F6Z,Z€0,H15SECTIONSHAPEATSOMEHEIGHTWITHLINESLINKINGP1P4,P5P8,WITHCIRCULARARCFILLETINGATTHEPOINTOFINTERSECTIONP1P8,THESECTIONSHAPEATSOMEHEIGHTISOBTAINED16SECTIONSHAPEATEVERYHEIGHTHISDIVIDEDTOINTERFACIALNUMBERINUMEQUALPARTSINUMISDECIDEDBYTHEPRECISION,IFTHEINUMISHIGHER,THEPRECISIONISBETTERTHESECTIONSHAPEISDRAWNATEVERYHEIGHTASSHOWNINFIG23/1117SMOOTHCURVEDSURFACEUSINGSKINCOMMANDINANSYS,SMOOTHCURVEDSURFACESWEREBUILTALONGTHELINESTHEYARETHESURFACESOFTHEINFLUENCEHOLEUSINGTHEVAITGENERATESAVOLUMEBOUNDEDBYEXISTINGAREACOMMAND,ASOLIDWASCREATEDFROMTHOSESURFACES18SYMMETRYOFTHEDIETHEMAINBODYANDKERNELOFTHEDIEWEREDRAWNUSINGTHEBOOLEANOPERATIONSOFADD,SUBTRACT,ETCFIG3THESYMMETRYOFTHEDIEWASUSEDTOACCELERATETHECOMPUTATIONSUSINGA1/4SOLIDMODELFORTHEFINITEELEMENTANALYSISFIG42COMPUTINGMODELAPLANARDIETHATEXTRUDESTHEALUMINIUMALLOY6063ALMGSIWASUSEDASANEXAMPLETHELIQUIDOIDOFALIS657℃9,ANDTHEMELTTEMPERATUREOFALMG2SIIS558℃TAKINGTHEEXTRUSIONPRESSUREANDTHEPRODUCTSQUALITYINTOACCOUNT,THEWORKINGTEMPERATUREWASDETERMINEDTOBE450℃THEDIEMATERIALIS4CR5MOSIV1H13BELOWTHE450℃,ITSYOUNGMODULUSANDPOSSIONRATIOARE210GPAAND025,RESPECTIVELYITSYIELDSTRENGTHIS1200MPATHEFRICTIONCOEFFICIENTIS03THESOLID923DSOLIDELEMENTWASUSEDTOCARRYTHROUGHTHEFREEMESHINORDERTOLOADTHEFRICTIONALFORCEWHILEEXTRUDING,THESURFACEEFFECTELEMENTSURF154WASUSEDTOPRODUCETHEREGULARQUADRANGLESFIG5FORTHE1600T4/11EXTRUDER,THEEXTRUSIONINTENSITYWASCOMPUTEDUSINGEQ710THEVALUESARESHOWNINTABLE1THEBRIDGECOLLAPSEOFTENTAKESPLACEINTHEDIEANDITSSTRENGTHISDETERMINEDBYTHEHEIGHTANDTHEDISTRIBUTIONOFTHEDIFFLUENCEHOLESINTHISPAPER,THEHEIGHTHANDTHERADIIR1ANDR2OFTHEDIFFLUENCEHOLESWEREUSEDASDESIGNVARIABLESANDTHEMAXIMUMEQUIVALENTPRESSURESMAXWASUSEDASTHEGOALFUNCTIONTHEDESIGNVARIABLERANGESARELISTEDINTABLE23COMPUTEDRESULTSFIGURE6ISTHEEQUIVALENTSTRESSDIAGRAMFROMFIG6WECANSEETHATTHESTRESSISLARGESTATTHEBRIDGE,ASEXPECTED24MAXIMUMEQUIVALENTSTRESSVALUESARELISTEDINTABLE3FROMLARGETOSMALLTHEDATASHOWSTHATTHENODALMAXIMUMEQUIVALENTSTRESSIS10665MPA,WHICHIS145HIGHERTHANTHESECONDONE9120MPA,ANDTHATTHESTRESSCONVERGENCEISVERYSEVEREINTHEBRIDGE,THISPARTISAPTTOPRODUCECRACK

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