The molding analysis of automobile parts using the diecasting system.docx
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The molding analysis of automobile parts using the diecasting system.docx
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Themoldinganalysisofautomobilepartsusingthediecastingsystem
Effectofweldingprocedureonwearbehaviourofamodifiedmartensitictoolsteelhardfacingdeposit OriginalResearchArticle
Materials&Design
Inthelastyearshardfacingbecameanissueofintensedevelopmentrelatedtowearresistantapplications.Weldingdepositscanfunctionalizesurfacesandreclaimcomponentsextendingtheirservicelife.Toolsteelsarewidelyusedinhardfacingdepositstoprovideimprovedwearproperties.Neverthelesssystematicstudiesofwearbehaviourofnewalloysdepositedbyhardfacing,underdifferentserviceconditionsarescarce.Inthisworktheeffectsofshieldinggas,heatinputandpost-weldheattreatmentonthemicrostructuralevolutionandwearresistanceofamodifiedAISIH13martensitictoolsteeldepositedbysemi-automaticgasshieldedarcweldingprocessusingatubularmetal-coredwire,werestudied.Fourcouponswereweldedwithdifferentweldingparameters.TheshieldinggasesusedwereAr–2%CO2andAr–20%CO2mixturesandtwolevelsofheatinputwereselected:
2and3 kJ/mm.Theasweldedand550 °C–2 hpost-weldheattreatedconditionswereconsidered.Fromthesecoupons,sampleswereextractedfortestingmetal–metalwearunderconditionofpureslidingwithaloadof500 N.Chemicalcompositionsweredetermined;microstructureandmicrohardnesswereassessed.Itwasfoundthatcontentofretainedausteniteinthemicrostructurevariedwiththeweldingconditionandthatheat-treatedsamplesshowedsecondaryhardening,associatedwithprecipitationphenomena.Nevertheless,asweldedsamplesshowedhigherwearresistancethanheattreatedspecimens.Underthesetestconditionspost-weldheattreatmentledtoareductioninwearresistance.Thebestwearbehaviourwasobservedinsamplesweldedwithlowheatinputandunderthelowestoxygenpotentialshieldinggasusedhere,intheasweldedcondition.Theinterveningmechanismwasmildoxidative.Theseresultswereexplainedintermsoftherelativeoxidationresistancestemmingfromdifferentweldingconditions.
ArticleOutline
1.Introduction
2.Experimentalprocedure
2.1.Weldedspecimens
2.2.Weldmetalcharacterization
2.3.Weartestingandmicrohardnessmeasurements
2.4.Characterizationoftestedsamples
3.Resultsanddiscussion
3.1.Macrostructure
3.2.Chemicalcomposition
3.3.Microstructure
3.4.Microhardness
3.5.Wearbehaviour
3.5.1.Wearrate
3.5.2.Wornsurfacesandoxides
3.5.3.Debris
4.Conclusions
Acknowledgements
References
Structuralparametersof7020alloyafterheattreatmentsimulatingtheweldingprocess OriginalResearchArticle
MaterialsCharacterization
ThestudypresentsquantitativeanalysisofparticleandgrainsizedistributionsinAl–Zn–Mg(7020)alloysubjectedtoaheattreatmentsimulatingtheweldingprocess.MicrostructuralanalysiswasdonebytheAPHELIONprogram.Somesignificantquantitativechangesinthesizeanddistributionofparticlesasafunctionoftheheattreatmenttemperaturewereobserved.Thechangeswererelatedtotheprocessofgrowth,dissolution,andprecipitationofnew,fineparticlesfromthesolidsolution.Theheattreatmentwasobservedtohavenoeffectonthegrainsizeandonthesizeofthelargestparticlesvisibleunderanopticalmicroscope.Thesephenomena,whichinfluencethestrengthhardeningandresidualstressfieldsdecidethepropertiesoftheweldedjoints.
ArticleOutline
1.Introduction
2.Experimentalconditions
3.Results
4.Discussionofresults
5.Conclusions
Acknowledgements
References
results26-50
50,408articlesfoundfor:
pub-date>1999andtak(((Motorvehicles)orrelatedorR&Dor(designofthebody)or(Professionalexperience)orChairor(R&Dcab)orFamiliar)and((Sheetmetal)or(designandanalysis)orLearnor(Cabdie)orweldingor(surfacecoating)orProcessorMoldor(designexperience)or(BodyR&D)or(ConstructionVehicles)))
Sustainabilityissuesinsheetmetalformingprocesses:
Anoverview OriginalResearchArticle
JournalofCleanerProduction
Environmentalsustainabilityinmanufacturingisnowadaysanurgentandremarkableissueandthemainconcernsarerelatedtomoreefficientuseofmaterialsandenergy.
Insheetmetalformingprocessesthereisstillalackofknowledgeinthisfieldmainlyduetotheneedofapropermodellingofsustainabilityissuesandfactorstobetakenintoaccount.Theaimofthispaperismainlytounderlinethestateoftheartfromaformingpointofviewaboutthesustainabilitycontributionsofferedinanyphaseofaproductlifecycle.Actually,alackintermsofcomprehensivecontributionsispresentinthetechnicalliterature,thus,theauthorstrytogiveasortofholisticvisionaimedtoprovidebasicguidelinesinordertohelpinidentifyingthepossiblesolutionswithregardtoallthephasesofaformingproductlifecycle.Themainattentionwaspaidtosheetmetalformingtechnologies.Thepapergivesanoverviewofthemaintopicsconcerningsheetmetalformingproblemsrelatedtoenergyandresourceefficiencywiththeaimtostresstheprincipalcontributionswhichmayderivefromsuchprocessestoenvironmentalperformancesofmanufacturing.
ArticleOutline
1.Introduction
2.Materialsforweightreduction
2.1.Aluminiumalloys
2.2.AHSS
2.3.Magnesiumalloys
2.4.Titaniumalloys
3.Recyclingissues
4.Efficiencyinmaterialsuse:
applicationsinsheetmetalforming
5.Technologiesforlightweightmaterialsmanufacturing
5.1.Temperatureeffects
5.2.Hydroformingtechnologies
5.3.Superplasticformingprocesses
5.4.IncrementalSheetForming
6.Formingprocessesenvironmentalimpactreduction
7.Conclusions
References
Strategiesforriskassessmentandcontrolinwelding:
challengesfordevelopingcountries OriginalResearchArticle
TheAnnalsofOccupationalHygiene
Metalarcweldingrangesfromprimitive(manual)toincreasinglycomplexautomatedweldingprocesses.Weldingoccupies1%ofthelabourforceinsomeindustrialisedcountriesandincreasingknowledgeofhealthrisks,necessitatingimprovedassessmentstrategiesandcontrolshavebeenidentifiedbytheInternationalInstituteofWelding(IIW),ILO,WHOandotherauthoritativebodies.Challengesfordevelopingcountriesneedtobeaddressed.Forsmallscaleproductionandrepairwork,predominantlybymanualmetalarconmildsteel,thefocusindevelopingeconomieshascorrectlybeenoncontrolofobviousphysicalandacutehealthaffects.
Developmentintroducesmoresophisticatedprocessesandhazards.Workpiecesofstainlesssteelandconsumableswithchromium,nickelandmanganeseconstituentsareusedwithincreasinglycomplexsemi-manualorautomatedsystemsinvolvingvarietyoffluxesorgasses.Uncriticaladoptionofnewweldingtechnologiesbydevelopingcountriespotentiatesfuturehealthproblems.Controlshouldbeintegralatthedesignstage,otherwisesubstantivedetrimentsandlatercostscanensue.Developingcountriesneedparticularguidanceonselectionoftheoptimisedweldingconsumablesandprocessestominimisesuchdetriments.
TheroleoftheIIWandtheMFRUaredescribed.Applicationsofoccupationalhygieneprincipalsofpreventionandcontrolofweldingfumeatsourcebyprocessmodificationarepresented.
ArticleOutline
1.Introduction
2.Challengesfordevelopingcountries
3.Internationalinstituteofwelding
4.Optimisationbyprocessmodification
5.Conclusion
Acknowledgements
References
汽车及相关专业
车身研发及设计
专业工作经验
主持
驾驶室研发
熟悉
钣金设计和分析,
了解
驾驶室模具、点焊以及表面涂装
工艺,
模具设计经验。
车身研发
工程车辆
Themoldinganalysisofautomobilepartsusingthedie-castingsystem OriginalResearchArticle
JournalofMaterialsProcessingTechnology
Thecastingdefectsthatarecausedbymoltenmetalwerecoldshutformation,entrapmentofair,gas,andinclusion.Butthecontrolofcastingdefectshasbeenbasedontheexperienceofthefoundryengineers.Inthispaper,computersimulationshavebeencarriedouttoanalyzetheflowofmoltenmetal.Thequantitativeanalyseswhichproposedeffectivemolddesignswereexecuted.Flowpatternsof0.15–0.16 m/smoltenmetalin15 mmthinplatecastingwereexaminedtofindtheoptimalparametersforthedie-castingprocess.Astheingatevelocityinthinplatecastingsincreased,thecoldshothaddecreased.Therunnershapeparametersaffectedtheoptimalconditionsthatwerecalculatedthroughsimpleequationsandexaminedusingtheexperimentaloutputs.Thecalculatedresultsforautomobilevalvebodymid-platetocontrolthedie-castingprocesshaveachievedgoodagreementswiththeexperimentaldataintermsoftensilestrengthandhardnesstest,andmaterialstructureshowedsatisfactoryresults.
ArticleOutline
1.Introduction
2.Die-castingprocess
3.Experimentation
4.Resultsanddiscussion
4.1.Solidificationtimeanalysis
4.2.Hardnesstest
5.Conclusions
References
Dissimilarfrictionweldingof6061-T6aluminumandAISI1018steel:
Propertiesandmicrostructuralcharacterization OriginalResearchArticle
Materials&Design
Joiningofdissimilarmaterialsisofincreasinginterestforawiderangeofindustrialapplications.Theautomotiveindustry,inparticular,viewsdissimilarmaterialsjoiningasagatewayfortheimplementationoflightweightmaterials.Specifically,theintroductionofaluminumalloypartsintoasteelcarbodyrequiresthedevelopmentofreliable,efficientandeconomicjoiningprocesses.Sincealuminumandsteeldemonstratedifferentphysical,mechanicalandmetallurgicalproperties,identificationofproperweldingprocessesandpracticescanbeproblematic.Inthiswork,inertiafrictionweldinghasbeenusedtocreatejointsbetweena6061-T6aluminumalloyandaAISI1018steelusingvariouspara
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