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1、附录3翻译原文Blankdesignandformabilitypredictionofcomplicatedprogressivediestampingpartusingamulti-stepunfoldingmethodZhangZhibing,LiuYuqi,DuTing,LiZhigangStateKeyLabofMaterialProcessingandDie&MouldTechnologyfHuazhongUniversityofScience&Technology,Wiman,Hiibei430074,ChinaarticleinfoArticlehisto
2、ry:Received17March2007Receivedinrevisedform12July2007Accepted24November2007AbstractAmulti-stepunfoldingmethod(MSUM)isdevelopedforblankdesignandformabilitypredictionofcomplicatedprogressivediestampingpart.Inthemethod,afiniteelementmodeloftheinverseapproach(IA)isdevelopedatalocalareaaccordi
3、ngtothestampingprocess,andtheintermediateshapeisunfoldedonareferencesurfaceatthelocalarea.Notonlytheinfluenceoftheconnection.blank-holderforceandthefriction.butalsotheinfluenceoftheoffsettingofthestrainneutrallayerwithdifferentradiusofcurvatureatlocalarea,areconsideredinthemodel.whichimpr
4、ovesthecalculationprecisionoftheblankshapeateachstep.Thekeyintermediateblankshapesandinitialblankshapecanbegeneratedusingthemethodwithmanytimesinaninversesequence.Theoptimumblankshapealsocanbedesignedaccordingtotheformabilityoftheformingpart.TheMSUMisillustratedtotheblankdesignofaprogress
5、ivediestampingpart,andabenchmarktestiscomparedwithexperimentalandothernumericalresults.Keywords:BlankdesignProgressivedieMulti-stepunfoldingmethodInverseapproach1.IntroductionAlargenumberofpartsonautomobilebodyaredeformedbystamping,andsometimesthefeaturesofthestampingpartsareverycomplicat
6、ed.Inordertoimprovethequalityandtheefficiencyofproducts.manypartsareformedusingprogressivedieprocess.Comparingwithsimplepresstool,progressivediehastheadvantagesofhighqualityandefficiencyofproduct,whichisespeciallysuitableforlarge-lotproductioninashortdeliverytime.However,itisverydifficult
7、todesignstriplayoutinprogressivediedesign,andonlytherichexperienceandtechnicalengineersarecompetenttodoitwell.Inthestriplayoutdesign,firstly,thestampingprocesssequenceisdesignedaccordingtothepartfeatureswithexperienceandsimpletheoreticalformula.Secondly,theshapeatea
