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15120082JOURNALOFPLASTICITYENGINEERINGVol115No11Feb12008(,150001)(,150001):,,,,,,,,;,,,,,:;;;;:TG306:A:100722012(2008)0120036205ResearchintothebendingofAluminumalloyprofileswithpolyurethanepadHEZhu2binWANGZhong2renTANGFeng(SchoolofMaterialsScience&Engineering,HarbinInstituteofTechnology,Harbin150001China)GEJie(CollegeofCivilEngineering,HarbinEngineeringUniversity,Harbin150001China)Abstract:Bendingwithpolyurethanepadisanewlydevelopedflexiblebendingmethodforprofileandextrusion.Inthebending,polyurethanepad(PURpad)isusedaslowerdie,whichcanprovidedistributedbendingmomentontheprofile.BycontrollingthepenetrationofprofileintothePURpad,bentprofilewithdifferentcurvatureradiuscanbemanufactured.DeviceforPURpadbendingisdesignedandmanufacturedfirst.Experimentalworksoftrough2shapedaluminumalloyprofilearecarriedoutbasedonthebendingdevicedevelopedabove.Profilesarebentwithconstantpenetrationdepthbutwithdifferentbendinglayouts,i.e.,normalbending,reversebendingandsidebending.Theresultsshowthecurvatureradiusofbentprofilewilldecreasesharplywhenpenetrationdepthbegintoincrease.However,thischangewillbeslightforbiggerpenetrationdepth.Fordiffer2entbendinglayouts,boththechangeofsectionmodulusofbendingandthepositionofneutralsurfacehavesignificanteffectonthecurvatureradiusofbentprofile.Profilewithbiggersectionmodulusofbendingwillbemoredifficulttobend,andthebiggerthedistancefromneutralsurfacetotheaxisoftheroller,thesmallerthecurvatureradius.Keywords:aluminumalloy;profile;bending;polyurethanepad;curvatureradiusE2mail:hithe@hit1edu1cn:,,1977,,,,,:2007203204,,,,,[122],M1Geiger[3]/,,,,,,,,;,,,,[426]H1C1Kwon[7]J1W1Lee[8],,,1111,1,,,350mm,,,,1000mm,,1a);b)Fig11SchematicdiagramandphotoofthedeviceforprofilebendingwithPURpad,1122a6061,2mm40mm150mm,93A2a);b);c);d)Fig12Bendingoftrough2shapedprofile113731:,300mm,,2b2d3,,,11433a3b1mm8mm3c1mm3mm5mm7mm3a);b);c)Fig13AluminumprofilesbentwithPURpad3,,,,,,2,,3,;,,,,,,,4a34a,,,43a);b)Fig14Bendingresultofthreedifferentlayouts,,,8315,4b,4a,,,,,,,,,,Wz=Izymax(1)IzzymaxyzIz=Ay2dA(2)Ayy,5a5bABC,,Izymax,Iz,ymax,,5a);b);c)Fig15Sectionmodulusofbendingfordifferentlayouts,6,,,,,,,,,6a);b)Fig16Thechangeofneutralsurfaceposition,,31),,,,;,2),,3),,,,;,,,,931:[1]NoahUtsumi,SyujiSakaki.Countermeasuresagainstundesirablephenomenainthedraw2bendingprocessforextrudedsquaretubes[J].JournalofMaterialsProcess2ingTechnology,2002.123:2642269[2],,.[J].,1999.30(5):4732478[3]MGeiger,HArnet,UEngel,FVollertsen.FlexiblesBiegenStranggepressterAluminiumprofile[J].Flexi2blesBiegenStranggepressterAluminiumprofile,BlechRohreProfile,1995.42(1):31234[4]FVollertsen,AxelSprenger,JurgenKraus,HorstAr2net.Extrusion,channel,andprofilebendingareview[J].JournalofMaterialsProcessingTechnology,1999.87:1227[5]MNock,MGeiger.Flexiblekinematic3D2bendingoftubesandprofiles[A].The7thInternationalConfer2enceonTechnologyofPlasticity[C],Yokohama,Ja2pan,2002:6432648[6]HArnet.Sectionbendingwithkinematicshaping[A].The7thInternationalConferenceonTechnologyofPlasticity[C].Yokohama,Japan,2002:234922354[7]HCKwon.Thebendingofanaluminumstructuralframewitharubberpad[J].JournalofMaterialsPro2cessingTechnology,2001.113:7862791[8]JWLee,HCKwon,MHRhee,YTIm.Determina2tionofforminglimitofastructuralaluminumtubeinrubberpadbending[J].JournalofMaterialsProcessingTechnology,2003.140:4872493(17),,2),,,[1]EsaErvasti,UlfSt¼hlberg.Aquasi23Dmethodusedforincreasingthematerialyieldinclosed2dieforgingofafrontaxlebeam[J].JournalofMaterialsProcessingTech2nology,2005.160:1192122[2]VictorVazquez,TaylanAltan.Diedesignforflashlessf2orgingofcomplexparts[J].JournalofMaterialsProcess2ingTechnology,2000.98:81289[3]AbelDSantos,JFerreiraDuarte,AnaReis.Theuseoffiniteelementsimulationforoptimizationofmetalformin2gandtooldesign[J].JournalofMaterialsPro2cessingTe2chnology,2001.119:1522157[4]HGrass,CKrempaszky,TReip.32DSimulationofhotformingandmicrostructureevolution[J].Computa2tionalMaterialsScience,2003.28:4692477[5]EDoege,RBohnsack.Closeddietechnologiesforhotforging[J].JournalofMaterialsProcessingTechnolo2gy,2000.98:16521700415