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径向冲模的断裂分析及改进措施 Abstract: Radialforgingisawidelyusedmetalformingprocessthatinvolvesapplyingradialcompressiveforceonaworkpiece,resultinginplasticdeformationandimprovedmechanicalproperties.However,duringtheradialforgingprocess,fracturecanoccurduetovariousfactorssuchasimproperdesign,materialdefects,andinadequateprocessparameters.Thispaperaimstoanalyzethecausesoffractureinradialforgingandproposesseveralimprovementmeasurestomitigatethisissue. 1.Introduction Radialforgingisahighlyefficientmetalformingtechniquethatproducescomponentswithenhancedstrength,improvedmicrostructure,andsuperiormechanicalproperties.Theprocessinvolvesapplyingcompressiveforcesonaworkpieceusingaconicalpunch,whichcausesthematerialtoflowradiallyoutwardandundergoplasticdeformation.Despiteitsnumerousadvantages,fracturecanoccurduringtheradialforgingprocess,negativelyimpactingproductivityandproductquality.Therefore,understandingthefracturemechanismsandimplementingeffectiveimprovementsarecrucialforsuccessfulradialforgingoperations. 2.Causesoffractureinradialforging 2.1Improperdiedesign Oneofthemaincausesoffractureinradialforgingisinadequatediedesign.Ifthedieisnotproperlydesigned,itcanresultinstressconcentrationareasthatpromotecrackpropagation.Tominimizethis,thediegeometryshouldfacilitateuniformdeformationandavoidsharpcornersandedgesthatcanactasstressraisers. 2.2Materialdefects Materialdefectssuchasinclusions,porosity,ornon-metallicinclusionscansignificantlydecreasethefracturetoughnessandincreasethesusceptibilitytofractureduringradialforging.Thesedefectsactasstressconcentratorsandreducethematerial'sabilitytowithstandtheappliedforces.Therefore,implementingappropriatedefectdetectionmethodsandensuringhigh-qualitymaterialsareessentialtopreventfracture. 2.3Inadequateprocessparameters Improperselectionofprocessparameterssuchaspunchspeed,forgingtemperature,andforgingpressurecanalsoleadtofractureduringradialforging.Ifthepunchspeedistoohigh,itcanresultinexcessivestrainrateandheatgeneration,leadingtothermalcracking.Onth