毕业设计外文翻译 冲压模具设计成型方面

湖北汽车工业学院科技学院毕业设计（外文翻译）1湖北汽车工业学院科技学院毕业设计（论文）英文翻译课题名称基于UG的高顶盖后板修边模参数化设计系部材料工程系专业材料成型及控制工程班级KT633-01学号2006K330130姓名何杏指导教师李芳华2010年3月10日湖北汽车工业学院科技学院毕业设计（外文翻译）24Sheetmetalformingandblanking4.1Principlesofdiemanufacture4.1.1ClassificationofdiesInmetalforming,thegeometryoftheworkpieceisestablishedentirelyorpartiallybythegeometryofthedie.Incontrasttomachiningprocesses,ignificantlygreaterforcesarenecessaryinforming.Duetothecomplexityoftheparts,formingisoftennotcarriedoutinasingleoperation.Dependingonthegeometryofthepart,productioniscarriedoutinseveraloperationalstepsviaoneorseveralproductionprocessessuchasformingorblanking.Oneoperationcanalsoincludeseveralprocessessimultaneously(cf.Sect.2.1.4).Duringthedesignphase,thenecessarymanufacturingmethodsaswellasthesequenceandnumberofproductionstepsareestablishedinaprocessingplan(Fig.4.1.1).Inthisplan,theavailabilityofmachines,theplannedproductionvolumesofthepartandotherboundaryconditionsaretakenintoaccount.Theaimistominimizethenumberofdiestobeusedwhilekeepingupahighlevelofoperationalreliability.ThepartsaregreatlysimplifiedrightfromtheirdesignstagebyclosecollaborationbetweenthePartDesignandProductionDepartmentsinordertoenableseveralformingandrelatedblankingprocessestobecarriedoutinoneformingstation.Obviously,themoreoperationswhichareintegratedintoasingledie,themorecomplexthestructureofthediebecomes.Theconsequencesarehighercosts,adecreaseinoutputandalowerreliability.Fig.4.1.1Productionstepsforthemanufactureofanoilsump湖北汽车工业学院科技学院毕业设计（外文翻译）3TypesofdiesThetypeofdieandthecloselyrelatedtransportationofthepartbetweendiesisdeterminedinaccordancewiththeformingprocedure,thesizeofthepartinquestionandtheproductionvolumeofpartstobeproduced.Theproductionoflargesheetmetalpartsiscarriedoutalmostexclusivelyusingsinglesetsofdies.Typicalpartscanbefoundinautomotivemanufacture,thedomesticapplianceindustryandradiatorproduction.Suitabletransfersystems,forexamplevacuumsuctionsystems,allowtheinstallationofdouble-actiondiesinasufficientlylargemountingarea.Inthisway,forexample,therightandleftdoorsofacarcanbeformedjointlyinoneworkingstroke(cf.Fig.4.4.34).Largesizesinglediesareinstalledinlargepresses.Thetransportationofthepartsfromoneformingstationtoanotheriscarriedoutmechanically.Inapresslinewithsinglepressesinstalledonebehindtheother,feedersorrobotscanbeused(cf.Fig.4.4.20to4.4.22),whilstinlarge-paneltransferpresses,systemsequippedwithgripperrails(cf.Fig.4.4.29)orcrossbarsuctionsystems(cf.Fig.4.4.34)areusedtotransfertheparts.Transferdiesareusedfortheproductionofhighvolumesofsmallerandmediumsizeparts(Fig.4.1.2).Theyconsistofseveralsingledies,whicharemountedonacommonbaseplate.Thesheetmetalisfedthroughmostlyinblankformandalsotransportedindividuallyfromdietodie.Ifthisparttransportationisautomated,thepressiscalledatransferpress.Thelargesttransferdiesareusedtogetherwithsinglediesinlarge-paneltransferpresses(cf.Fig.4.4.32).Inprogressivedies,alsoknownasprogressiveblankingdies,sheetmetalpartsareblankedinseveralstages;generallyspeakingnoactualformingoperationtakesplace.Thesheetmetalisfedfromacoilorintheformofmetalstrips.Usinganappropriatearrangementoftheblankswithintheavailablewidthofthesheetmetal,anoptimalmaterialusageisensured(cf.Fig.4.5.2to4.5.5).Theworkpieceremainsfixedtothestripskeletonupuntilthela湖北汽车工业学院科技学院毕业设计（外文翻译）4Fig.4.1.2Transferdiesetfortheproductionofanautomatictransmissionforanautomotiveapplication-stoperation.Thepartsaretransferredwhentheentirestripisshiftedfurtherintheworkflowdirectionaftertheblankingoperation.Thelengthoftheshiftisequaltothecenterlinespacingofthediesanditisalsocalledthestepwidth.Sideshears,veryprecisefeedingdevicesorpilotpinsensurefeed-relatedpartaccuracy.Inthefinalproductionoperation,thefinishedpart,i.e.thelastpartinthesequence,isdisconnectedfromtheskeleton.Afieldofapplicationforprogressiveblankingtoolsis,forexample,intheproductionofmetalrotorsorstatorblanksforelectricmotors(cf.Fig.4.6.11and4.6.20).Inprogressivecompounddiessmallerformedpartsareproducedinseveralsequentialoperations.Incontrasttoprogressivedies,notonlyblankingbutalsoformingoperationsareperformed.However,theworkpiecealsoremainsintheskeletonuptothelastoperation(Fig.4.1.3andcf.Fig.4.7.2).Duetotheheightoftheparts,themetalstripmustberaisedup,generallyusingliftingedgesorsimilarliftingdevicesinordertoallowthestripmetaltobetransportedmechanically.Pressedmetalpartswhichcannotbeproducedwithinametalstripbecauseoftheirgeometricaldimensionsarealternativelyproducedontransfersets.湖北汽车工业学院科技学院毕业设计（外文翻译）5Fig.4.1.3ReinforcingpartofacarproducedinastripbyacompounddiesetNexttothediesalreadymentioned,aseriesofspecialdiesareavailableforspecialindividualapplications.Thesediesare,asarule,usedseparately.Specialoperationsmakeitpossible,however,forspecialdiestobeintegratedintoanoperationalSequence.Thus,forexample,inflangingdiesseveralmetalpartscanbejoinedtogetherpositivelythroughthebendingofcertainmetalsections(Fig.4.1.4andcf.Fig.2.1.34).Duringthisoperationreinforcingparts,glueorothercomponentscanbeintroduced.Otherspecialdieslocatespecialco