论文海报模板PPT课件下载推荐.pptx
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论文海报模板PPT课件下载推荐.pptx
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AirbendingofAZ31magnesiumalloyinwarmandhotformingconditionsC.Bruni,A.Forcellese,F.Gabrielli,M.SimonciniDepartmentofMechanics,PolytechnicUniversityofMarche,ViaBrecceBianche,Ancona,ItalyCONCLUSIONS1.Inalltheprocessconditions,theformingloadincreasesinearlybendingstageandthendecreasesduringthefinalstage;@#@2.Foragiventemperature,strokeandpunchspeed,springbackdecreaseswithdecreasingpunchradius;@#@3.Springbackdecreaseswithincreasingformingtemperature,irrespectiveofthepunchradiusvalue,eventhoughsucheffectisreducedwithdecreasingpunchradiusandbecomesalmostnegligibleforthesmallestoneinvestigated;@#@DISCUSSION1.Theinfluenceofthepunchradiusonspringback;@#@foragiventemperatureandpunchspeed,anincreaseinthespringbackratiowithdecreasingRappears.2.ThepunchspeedcanbeseenthattheKvalueisalmostinsensitivetov,evenifatrendcharacterisedbyaslightdecreaseinspringbackwithincreasingpunchspeed.3.Foragiventemperatureandpunchradius,thevolumefractionrecrystallisedincreaseswithincreasingpunchspeed.RESULTS(CONT.)nPunchspeedeffectonthemicrostructureofthebentspecimens,R=4mmandT=300C:
@#@(a)v=0.45mm/sand(b)v=4.5mm/s.RESULTSnThespringbackratioincreaseswithincreasingtemperatureandpunchradius.INTRODUCTIONOverviewandimportance.TheeffectoftheprocessparametersonspringbackofAZ31magnesiumalloywasinvestigatedbyperformingairbendingtestsunderwarmandhotformingconditions.Magnesiumalloyshavebeenemergingaspotentiallycandidatesforseveralapplications,inparticularforlightweightstructuralandfunctionalpartsintheaerospace,automotiveandelectronicindustries.Objective.Todate,themechanicalpropertiesofmagnesiumalloyswereinvestigatedbymanyresearchers115;@#@however,nosystematicstudyontheeffectoftheprocessparametersonspringback,underwarmandhotformingconditions,canbefound.Reference1.F.-K.Chen,T.-B.Huang,C.-K.Chang,DeepdrawingofsquarecupswithmagnesiumalloyAZ31sheets,Int.J.Mach.ToolsManuf.43(2003)15531559.METHODSMaterialnAZ31magnesiumalloywassuppliedinformof3mmthicksheets,50mminlengthand27mminwidth.nThechemicalcomposition(inwt%)oftheMgalloyisthefollowing:
@#@3%Al,1%Zn,0.2%MnandbalanceMg.ExperimentalproceduresnV-punchandU-diebendingexperimentswerecarriedoutatdifferenttemperaturesrangingfrom100to400C,withdifferentvaluesofpunchspeed(v=0.45and4.5mm/s).nThreedifferentV-punches,withaconstantangleof60andnoseradii(R)of2,4and6mm,wereusedinthebendingtrials.nPunchspeedeffectonthespringbackrationInfluenceoftemperatureontheloadpunchstrokecurves(v=0.45mm/sandR=6mm).
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