冲压模具设计成型方面毕业设计外文翻译Word格式文档下载.docx

冲压模具设计成型方面毕业设计外文翻译Word格式文档下载.docx

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英文翻译

课题名称

系部

材料工程系

专业

材料成型及控制工程

班级

学号

姓名

指导教师

2010年3月10日

4Sheetmetalformingandblanking

4.1Principlesofdiemanufacture

4.1.1Classificationofdies

Inmetalforming,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

Typesofdies

Thetypeofdieandthecloselyrelatedtransportationofthepartbetweendiesisdeterminedinaccordancewiththeformingprocedure,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

Fig.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.Presse