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1、摘要ABSTRACTAsmodernstampingtechnologyquicklydevelopinganditsapplicationareabeingenlarge氏aimingatincreasingproductivityandimprovingqualityofblankedpartsaswellasreducingproductioncost,manyblankingprocesseshavebeenbroughtforwarduntilnow.However,comparedwithgeneralblanking,thoseprocessescos
2、ttoomuchinproductionandwithatoughenvironmentofpunchbeingpressed,diversifiedfactorsduringthedesign,manufactureandutilizationcoursesmayresultinbend,break,severeabrasionofpunchandthusshorteningofdielife.moreover,forgeneralblankedpartswiththickplate,thequalityofcross-sectionofblankedpartsa
3、reverypoor,espiecialytheburnishlengthisnot吨enoughwhichinfluencequalityofblankedparts.Basedonlotsofdomesticandabroadtechnologicinformation,forincreasingtheburnishlengthofcross-sectionofblankedparts,researchonformingprocessofblankinghasbeendoneinthearticle.Firstly,someblankingprocessesfo
4、rimprovingqualityofcross-sectionofblankedpartsareenumerated,anewblankingprocessi.e.dualpositiveclearenceblankingprocessispresentedanddemonstratedwithplentifultheoreticalexperiments.Secondly,basicknowledgeaboutfinite-element-methodonwhichnumericalsimulationtechnologyisreliedisbrieflyint
5、roduced,andthecharacterandfunctionofFEMnumericalsimulationsoftwareDeform,exclusivelyusedforbulkforming,aresummarizedandanalyzed,followedbytheanalysisonstressandstrainaswellasdeformationprocessintheutilizationofnumericalsimulationsoftwareD晌rm-2D.Finaly,practicalexperimentsonbig-holeblan
6、kingforvehiclespokesaredoneundertheutilizationofdualpositiveclearanceblankingprocess,followed妙analysisoftheexperimentresults.Dualpositiveclearanceblankingprocesspresentedinthisarticleenrichsstampingprocess,Asitbringsanacademicinnovationandmeetsthedemandsofproductionaswel,itwillofferani
7、nstructionalandreferencedsignificancetofurtherresearchandspreadingofformingprocessofstampingtechnology.KeyWord:Dualpositiveclearance;blanking:FEMnumericalsimulation学位论文独创性声明学位论文独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的研究成果。据我所知，除了文中特别加以标注和致谢的地方外，论文中不包含其他人己经发表或撰写过的研究成果，也不包含为获得南昌大学或其他教育机构的
