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1、ImprovingPerformanceofProgressiveDiesProgressivediestampingisacost-effectiveandsafemethodofproducingcomponents.Carefuldesignandconstructionofdieswillensureoptimumperformance.Aprogressivedieperformsaseriesoffundamentalsheetmetaloperationsattwoormorestationsinthedie
2、duringeachpressstroke.Thesesimultaneousoperationsproduceapartfromastripofmaterialthatmovesthroughthedie.Eachworkingstationperformsoneormoredieoperations,butthestripmustmovefromthefirststationthrougheachsucceedingstationtoproduceacompletepart.Carriers,consistingofo
3、neormorestripsofmaterialleftbetweentheparts,providemovementofthepartsfromonediestationtothenext.Thesecarrierstripsareseparatedfromthepartsinthelastdiestation.Therearesixelementsthatshouldbeaddressedwhendesigningandbuildingaprogressivedietomaximizeitsperformance:·I
4、nterpretingthepartprint,·Startingmaterialintothedie,·Partliftersandpartfeeding,·Flexiblepartcarriers,·Upperpressurepads,and·Drawnshells.InterpretingthePartPrintThefirststepintheproperdesignofaprogressivedieistocorrectlyanalyzethepartprint.Thetooldesignermustinterp
5、rettheprinttodeterminethefunctionofthepartbylookingforsuchthingsasthetypeofmaterial,criticalsurfaces,holesizeandlocation,burrlocation,graindirectionrequirements,surfacefinishandotherfactors.Thediedesignermustunderstandthepartwell,particularlyifithasirregularshapes
6、andcontours.However,moderncomputer-drawnprintsmakethismoredifficultbecausecomputer-drawnpartdatacanbedownloadeddirectlytothedie-designcomputer.Asaresult,thedesignermaynotbecomethoroughlyfamiliarwithimportantpartfeatures.Also,manycomputer-drawnpartsaremoredifficult
7、tounderstand,becauseoften,onlyonesurfaceisshownanditmaybetheinsideoroutsidesurface.Computerdrawingsoftenshowalllines,includinghiddenfeatures,assolidlinesinsteadofdottedlines.Thisleadstointerpretationerrors,whichinturnleadstoerrorsinthebuildingofthedie.Tobetterunde
8、rstandcomplexpartshapes,itishelpfultobuilda"sight"modelofthepartusingsheetwax,rubberskinsorwoodmodels.Dimensionalaccuracyisnotcriticalforthesemodels,ast
