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1、REDCDBlankingistheuseofmoldstoproduceseparatesheetstampingprocessessubjects,includingblankingandpunching.Itcanbemadeintoparts,butalsoforthebending,drawing,formingandotherprocessestopreparerough.WasheddownfromtheBoardDivisionontheshapeofthepartsrequired(orrou
2、gh)calledoffthebranches.Theshapeoftheworkpieceoutoftheholerequired(redtogotowaste)iscalledpunching.FigureI-1ofthewasher,fromfallingbranchesandpunchingtwoprocessestocomplete.Productionpractice,wedieblankingprocessofacertainunderstandingofthestructure,butperce
3、ptualknowledgetorationalknowledgeuptotrulyunderstandthenatureoftheblankingprocess,abetterdesignofthedevelopmentprocessanddie.Thefollowingdeformationontheblankingprocess,thequalityofstampingparts,stampingdiedesignandstampingdiesizebladestructuraldesignissuesd
4、iscussed..SectionblankingdeformationmechanismBlankingprocessShowninFigure1-2blankingbythedeformationprocesscanbeseenthatthecompositionofthepunchandtheupperandlowerconcaveedgechess,materialontheconcavemold,punchthematerialdeformationgraduallydecreaseduntilthe
5、completionofalltheseparateblanking.Withthepunchoftheexternalforcesactingonmaterialchangesinthenumberofthematerialontheexternalforcechangesinquantity,materialdeformationwithinthecontinuousdevelopment.Thedeformationoftheblankingprocessisdividedintothreestages(
6、Figure1-2).1,elasticdeformationstagePunchcontactwithmaterialforceasthepunchpressure,thematerialiselasticcompressionandbending,andsqueezeintothediehole.Thenthestressdoesnotexceedthematerialyieldlimit,ifthepunchrelief,materialorrestitution,sothatelasticdeforma
7、tionstage.2,plasticdeformation22Punchtopressure,thestressreachestheyieldlimitofmaterial,somemetalissqueezedintothediehole,producingplasticsheardeformation,areshiningmaggotcutsurface.Forconvex,concavefeelthereisroombetweenthedepression,itistheplasticsheardefo
8、rmationisalsoaccompaniedbythebendingandstretching.3,faultisolationstageMaterialscontinuetoincreaseexternalandinternalstressincreasing,convex,becausetheincisiondiestressconcentration,shearstrengt
