Determination of optimal shapes for the stampings of arbitra(3)

118H.Shim/JournalofMaterialsProcessingTechnology121(2002)116±122

Fig.3.Optimalblankdesignprocedure.

3.1.Trapezoidalcupdeepdrawing

inDieshapeFig.geometryof4.thef130blankcircularfortrapezoidalcupdeepdrawingisshownto®ndblankoptimalhasbeenshapechosenforthisastheprocess.

initialFig.4.Diegeometryfortrapezoidalcupdeep

drawing.

TableMaterial1

propertyoftheblankYoung'sPoisson'smodulusE 2Â105RrationStress±strain-value

R MPas 0:3Coulomb'srelationoffriction

coefficientm 1 514:38

0:24 0punch:001 =sheete 0:2 MPa

;m 0:12 die=sheet

shapeThe¯ange.withtargetshapeafterdeformationisdeterminedastheerrorTheuniformoffsetdistrimmingtakenaswidth1.0mmof1.75mmattheblank,allowancepunchdeformationistakenas0.5mm.WithandthegiventhecontourinitialcedureFig.displacementprocesshasbeenanalyzeduntilthe5reaches20mmwithPam-Stamp1.targetbyshowscomparingtheevolutionthedeformedofoptimal¯angeblankcontourdesignandpro-analysis.shape.withFig.The5(a)deformedshowstheshape¯angeisobtainedfromthetheFEcupf130circularblank.The¯angecontourcontourofofdrawnthedrawncupandexhibitsstages,(c)showssomethedeviation¯angecontoursfromtargetof2ndcontour.andFig.5(b)sensitivityrespectively,tionmethod.Aswhichtheshapeisdeterminederrorbythe3rdpresentdesign0.5mmofblankateveryreachedoutermostwithinnode,thecontoureaftertheblankerror2ndshapeallowancemodi®ca-has

been

ofFig.design5.(Blankf130);shapes(b)2ndanddesign;deformed(c)3rdflangedesignatthe(optimaldesignblank).

stages:(a)initial