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1、journalofmaterialsprocessingtechnology197(2008)393–407journalhomepage:www.elsevier.com/locate/jmatprotecDevelopmentofananalyticalmodelforwarmdeepdrawingofaluminumalloysHongSeokKimb,∗,MuammerKoc¸a,JunNibaNSFI/UCRCCenterforPrecisionForming(CPF),DepartmentofMechanicalE
2、ngineering,VirginiaCommonwealthUniversity(VCU),Richmond,VA23284,USAbDepartmentofMechanicalEngineering,UniversityofMichigan,AnnArbor,MI48109-2125,USAarticleinfoabstractArticlehistory:Inthisstudy,ananalyticalmodelwasdevelopedtoinvestigatetheeffectsofmaterial,pro-Recei
3、ved31March2007cess,andgeometricparametersinthewarmformingofaluminumalloysundersimpleReceivedinrevisedform9June2007cylindricaldeepdrawingconditions.Themodelwasvalidatedwithbothexistingexperimen-Accepted15June2007talfindingsintheliteratureandFEAresults.Theeffectsofthem
4、ainprocessparameters(i.e.,temperature,formingrate,blankholderpressure(BHP),andfrictionbetweenablankandatoolingelement)onformabilitywerestudiedunderavarietyofwarmformingconditions.Keywords:Thedevelopedmodeloffersrapid,useful,andreasonablyaccurateresultsforthedesignof
5、WarmformingwarmformingprocessbypredictingthedeformationmechanismofthematerialandtheLightweightmaterialrelationshipsbetweenlimitingdrawingratio(LDR)andprocessparametersinisothermalAnalyticalmodelandnon-isothermalheatingconditions.Itwasdemonstratedthatsignificantformab
6、ilityDeepdrawingimprovementcouldbeachievedwhenalargetemperaturegradientwasrealizedbetweenFiniteelementanalysisdieandpunch,whileaslightdecreaseofLDRwasobservedwhentoolingelementsandablankwereheateduptosametemperaturelevels.©2007ElsevierB.V.Allrightsreserved.1.Introdu
7、ctionventionalformingtechnologies(i.e.,stamping)becauseoftheformabilitylimitationsofthesematerialsatcoldconditions.TherealizationoflightweightstructuresfortransportationToimprovetheformabilityoflightweightsheetmateri-vehicles(aerospaceandautomotive)isaprominentwayof
8、als,warmformingprocesseshavebeenwidelyinvestigatedimprovingfuelefficiencyandreducingemissions.Becausesincethe1940sasanalternativemanufactur
