外文翻译--铝合金压铸模的失效分析 英文文.pdf外文翻译--铝合金压铸模的失效分析 英文文.pdf

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BKOSECFAILURESOFDIESFORDIECASTINGOFALUMINIUMALLOYSRECEIVED–PRISPJELO20061223ACCEPTED–PRIHVA}ENO20070420PRELIMINARYNOTE–PRETHODNOPRIOP}ENJEINTRODUCTIONDIECASTINGISTHEMOSTCOSTEFFICIENTANDTECHNICALEASYMETHODOFCASTINGSOPHISTICATEDANDACCURATEALUMINIUMALLOYSPARTSINGREATSCALESERIESC911C93ALUMINIUMALLOYSDIECASTINGSREQUIRELITTLEMACHININGPRIORTHEFINALINSTALLATIONAPPROXIMATELYHALFOFALLCASTINGSWORLDWIDEMADEOFALUMINIUMALLOYSAREMANUFACTUREDINTHISWAYAREUSEDFORAWIDERANGEOFAUTOMOTIVEPARTSANDOTHERCONSUMERGOODSC912C93THECOMPARISONOFNINEPARAMETERSOFTHEDIECASTINGVERSUSSTAMPING,FORGING,SANDCASTING,PERMANENTMOLDCASTINGANDPLASTICMOLDINGC913C93ISPRESENTEDINTABLE1ALUMINIUMALLOYSDIECASTINGDIESFAILBECAUSEOFANUMBEROFDIFFERENTANDSIMULTANEOUSLYOPERATINGSTRESSESTHESTRESSESAREOFTWOBASICKINDSC914C93STRESSESCREATEDBYTHEMANUFACTURINGOFTHEDIEANDSTRESSESFORMEDBYTHEEXPLOITATIONPROCESSALONGDIEWORKINGLIFEISOFESSENTIALIMPORTANCEFORTHEECONOMICALPRODUCTIONOFALUMINIUMALLOYSDIECASTINGSC914,5C93THEREPLACEMENTOFADIEISEXPENSIVEINBOTHMONEYANDPRODUCTIONTIMETHEMOSTFREQUENTFAILURESOFALUMINIUMALLOYSDIECASTINGDIESCANGENERALLYBEDIVIDEDINTOFOURBASICGROUPSC911C93HEATCHECKING,CORNERCRACKING,SHARPRADIIORSHARPEDGESCRACKING,ANDCRACKINGDUETOWEAROREROSIONITISGENERALLYAGREEDTHATONEOFTHEPRINCIPALCAUSESOFTERMINATIONOFDIELIFEISHEATCHECKING,WHICHOCCURSTHROUGHAPROCESSOFCRACKINITIATIONANDPROPAGATIONINDUCEDBYTHETHERMALSTRESSFATIGUINGOFADIESURFACEC9168C93SOMEOFTHEFACTORSTHATAFFECTDIEFAILURESMAYBECONTROLLEDTOSOMEEXTENTBYTHEDIECASTINGEXPERTSDESIGNERS,MANUFACTURERSANDOPERATORSC919C93THESEFACTORSINCLUDEC9110C93DESIGN,MATERIALSSELECTION,HEATTREATMENT,FINISHINGOPERATIONS,ANDHANDLINGANDUSETESTINGOFDIECASTINGDIESINTHEFRAMEOFOURINVESTIGATIONWORKACOMPLEXANALYSISOFATYPICALDIESFORDIECASTINGOFALUMINIUMALLOYSHASBEENCARRIEDOUTC9111C93THEWHOLEDIECASTINGMACHINEISSHOWNINFIGURE1,ANDTHEFIXEDHALFOFTHETESTINGDIECASTINGDIEISINFIGURE2METALURGIJA4720081,515551DIECASTINGDIESFORCASTINGOFALUMINUMALLOYSFAILBECAUSEOFAGREATNUMBEROFDIFFERENTANDSIMULTANEOUSLYOPERATINGFACTORSMATERIALSELECTION,DIEDESIGN,ANDTHERMALSTRESSFATIGUEGENERATEDBYTHECYCLICWORKINGPROCESSHEATCHECKING,ASWELLASTOLOWANDINHOMOGENEOUSINITIALDIETEMPERATURECONTRIBUTETOTHEFAILURESANDCRACKSFORMATIONON/INDIESFORDIECASTINGOFALUMINIUMALLOYSINTHEFRAMEOFTHEPRESENTEDINVESTIGATIONWORKTHEINTENSITYANDHOMOGENEITYOFTHETEMPERATUREFIELDSONTHEWORKINGSURFACEOFTHETESTINGDIEWERECHECKEDTHROUGHTHERMOGRAPHICMEASUREMENTS,ANDFAILURESANDCRACKSONTHEWORKINGSURFACEOFTHEDIEWEREANALYSEDWITHNONDESTRUCTIVEMETALLOGRAPHICEXAMINATIONMETHODSKEYWORDSDIECASTING,WORKINGSURFACE,ALUMINIUMALLOY,TEMPERATUREFIELD,FAILUREANALYSISO{TE}ENJEKALUPAZALIJEVANJEALUMINIJSKIHLEGURADOO{TE}ENJAKALUPAZALIJEVANJEALUMINIJSKIHLEGURADOLAZIZBOGISTODOBNOGUTJECAJABROJNIHRAZLIITIHRADNIHIMBENIKAKODKALUPAZALIJEVANJEALUMINIJSKIHLEGURAIZBORMATERIJALA,KONSTRUKCIJAKALUPA,ZAMORNOTERMALNONAPREZANJEZBOGCIKLIKOGRADNOGPROCESATENISKAINEHOMOGENAPOLAZNATEMPERATUREKALUPADOPRINOSEO{TE}ENJUINASTAJANJUPUKOTINAUOKVIRUOVOGISTRAIVANJAKONTROLIRANJEINTEZITETIHOMOGENOSTTEMPERATURNAPOLJANARADNOJPOVR{INIISPITANOGKALUPAPOMO}UTERMOGRAFSKIHMJERENJA,AO{TE}ENJAIPUKOTINENARADNOJPOVR{INIANALIZIRANISUNEDESTRUKTIVNIMMETALOGRAFSKIMMETODAMAKLJUNERIJEILIJEVANJEUKALUP,RADNAPOVR{INA,ALUMINIJSKALEGURA,TEMPERATURNOPOLJE,ANALIZAO{TE}ENJAISSN05435846METABK47151552008UDC–UDK6217404366971111BKOSEC,FACULTYOFNATURALSCIENCESANDENGINEERING,UNIVERSITYOFLJUBLJANA,LJUBLJANA,SLOVENIATHEHOTWORKDIESTEELMUSTHAVEEXCELLENTPROPERTIESC9112C93REQUESTEDPROPERTIESANDDAMAGEMECHANISMSOFTHEDIEMATERIALARESHOWNINTABLE2C9113C93THETESTINGDIEWASMANUFACTUREDFROMTHEBOEHLERW300ISODISCC9114C93HOTWORKTOOLSTEEL,WHICHISWIDELYUSEDFORALLKINDSOFHOTWORKINGTOOLSANDDIESTHETHERMALANDMECHANICALPROPERTIESOFBOEHLERW300ISODISCSTEELAREGIVENBYTHEPRODUCERTHELIQUIDUSTEMPERATUREOFCASTEDALUMINIUMALLOYALSI9CU3ISAPPROXIMATELYOF593C,ANDCASTINGTEMPERATUREISAPPROXIMATELY50CHIGHER,THEREFORETHEPROPERTIESINTHETEMPERATUREINTERVALFROMTHEAMBIENTTEMPERATUREUPTOAPPROXIMATELY700CAREIMPORTANTFORTHEANALYSISOFTHEDISCUSSEDCASETHEDENSITYOFBOEHLERW300ISODISCSTEELATAMBIENTTEMPERATURE20CISAPPROXIMATELYOF7800KG/M3,ANDITDECREASESWITHHIGHERTEMPERATUREUPTOTHETEMPERATUREOF700CITDROPSFORABOUT200KG/M3THISSTEELHASARELATIVELYLOWANDNEARLYLINEARINCREASINGTEMPERATUREDEPENDENTHEATCONDUCTIVITYFROM19,2TO26,3W/MK,ANDPROPORTIONALLYCONSTANTTHERMALDIFFUSIVITYTHEWHOLETIMEITISAPPROXIMATELYOF5C215106M2/SSPECIFICHEATISINCREASEDWITHHIGHERTEMPERATUREANDITISFROM456TO587J/KGK,RESPECTIVELY,FORTHEBOUNDARYVALUESOFTHECHOSENTEMPERATURERANGETHELINEARCOEFFICIENTOFELONGATIONSLOWLYINCREASESFROM10,7C215106/KAT20CTO13,2C215106/KAT700C,WHILETHEMODULUSOFELASTICITY,WITHBOUNDARYVALUESOF211AND168GPA,DECREASESWITHTHEINCREASEOFTEMPERATURETEMPERATUREMEASUREMENTSANDANALYSISWHENTHEMELTSWETSTHEDIEACTIVEWORKINGSURFACETHEDIEEXPANDSANDTHENCONTRACTSASTHESURFACETEMPERATUREISLOWEREDBYTHEDIFFUSIONOFHEATINTOTHESTEELBE52METALURGIJA4720081,5155BKOSECFAILURESOFDIESFORDIECASTINGOFALUMINIUMALLOYSTABLE1COMPARISONOFNINEPARAMETERSOFTHEDIECASTINGANDOTHERPROCESSESC913C93COMPAREDWITHNINEPOINTSO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
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