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1、大学毕业设计（论文）DeepDrawingWithInternalAir-PressingtoIncreaseTheLimitDrawingRatioofAluminumSheetYoungHoonMoon*t,YongKeeKang,JinWookPark,SungRakGongEngineeringResearchCenterforNetShapeandDieManufacturing,PusanNationalUniversityTheeffectsofinternalair-pressingondeepdrawabilityarein
2、vestigatedinthisstudytoincreasethedeepdrawabilityofaluminumsheet.Theconventionaldeepdrawingprocessislimitedtoacertainlimitdrawingratio(LDR)beyondwhichfailurewilloccur.Theintentionofthisworkistoexaminethepossibilitiesofrelaxingtheabovelimitationthroughthedeepdrawingwithinter
3、nalair-pressing,aimingtowardsaprocesswithanincreaseddrawingratio.Theideawhichmayleadtothisgoalistheuseofspecialpunchthatcanexerthighpressureontheinternalsurfaceofdeformingsheetduringthedeepdrawingprocess.OvertherangesofconditionsinvestigatedforAI-1050,thelocalstrainconcentr
4、ationatpunchnoseradiusareawasdecreasedbyinternalair-pressingofpunch,andthedeepdrawingwithinternalair-pressingwasprovedtobeveryeffectiveprocessforobtaininghigherLDR.Keywords:DeepDrawing,InternalAir-Pressing,LimitDrawingRatio(LDR),AI-10501.IntroductionAluminumalloysheetsarein
5、feriorinpressformabilitycomparedtothemildsteelsheets.Mostofthealuminumalloyshaveanr-value(plasticanisotropyvalue)between0.7and1.0.Nonetheless,eventhoughther-valuesforthealuminumalloysareonlyabouthalfofsteel(Roger,1991),theyshow,undertherightcircumstances,quitesatisfactorydr
6、awing11大学毕业设计（论文）behavior.Amongthealuminumalloyssomenoticeabledifferencesinformingbehavioronthestampingshopfloorhavebeenobserved(Roger,1991;Lange,1985)becausetherelationshipbetweenthematerial,diedesignandtestparameters,etc.,versusthedeepdrawabilitymaychangewithalloysystems.
7、Whilemanyofthegeneralmetallurgicalanddiedesignprinciplesthatpromoteenhanceddeepdrawingareunderstood,theresearchestoimprovetheformabilityofaluminumsheetarestillinsufficient.Deepdrawingisaprocessforshapingflatsheetsintocup-shapedarticleswithoutfractureorexcessivelocalizedthin
8、ning.tFirstAwhor•CorrespondingAuthor,E-mail:yhmoon@hyowon.pusan.ac.krTEL:+82-51-51
