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1、大学毕业设计（论文）DeepDrawingWithInternalAir-PressingtoIncreaseTheLimitDrawingRatioofAluminumSheetYoungHoonMoon*t,YongKeeKang,JinWookPark,SungRakGongEngineeringResearchCenterforNetShapeandDieManufacturing,PusanNationalUniversityTheeffectsofinternalair-pressingonde
2、epdrawabilityareinvestigatedinthisstudytoincreasethedeepdrawabilityofaluminumsheet.Theconventionaldeepdrawingprocessislimitedtoacertainlimitdrawingratio(LDR)beyondwhichfailurewilloccur.Theintentionofthisworkistoexaminethepossibilitiesofrelaxingtheabovelimi
3、tationthroughthedeepdrawingwithinternalair-pressing,aimingtowardsaprocesswithanincreaseddrawingratio.Theideawhichmayleadtothisgoalistheuseofspecialpunchthatcanexerthighpressureontheinternalsurfaceofdeformingsheetduringthedeepdrawingprocess.Overtherangesofc
4、onditionsinvestigatedforAI-1050,thelocalstrainconcentrationatpunchnoseradiusareawasdecreasedbyinternalair-pressingofpunch,andthedeepdrawingwithinternalair-pressingwasprovedtobeveryeffectiveprocessforobtaininghigherLDR.Keywords:DeepDrawing,InternalAir-Press
5、ing,LimitDrawingRatio(LDR),AI-10501.IntroductionAluminumalloysheetsareinferiorinpressformabilitycomparedtothemildsteelsheets.Mostofthealuminumalloyshaveanr-value(plasticanisotropyvalue)between0.7and1.0.Nonetheless,eventhoughther-valuesforthealuminumalloysa
6、reonlyabouthalfofsteel(Roger,1991),theyshow,undertherightcircumstances,quitesatisfactorydrawing23大学毕业设计（论文）behavior.Amongthealuminumalloyssomenoticeabledifferencesinformingbehavioronthestampingshopfloorhavebeenobserved(Roger,1991;Lange,1985)becausetherelat
7、ionshipbetweenthematerial,diedesignandtestparameters,etc.,versusthedeepdrawabilitymaychangewithalloysystems.Whilemanyofthegeneralmetallurgicalanddiedesignprinciplesthatpromoteenhanceddeepdrawingareunderstood,theresearchestoimprovetheformabilityofaluminumsh
8、eetarestillinsufficient.Deepdrawingisaprocessforshapingflatsheetsintocup-shapedarticleswithoutfractureorexcessivelocalizedthinning.tFirstAwhor•CorrespondingAuthor,E-mail:yhmoon@hyowon.pusan.ac.krTEL:+82-51-51
