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1、重庆大学硕士学位论文II英文摘要ABSTRACTRingrollingisakindofplasticformingprocesswhichcanmakethethicknessofaringdecrease,thediameterincreaseandthecrosssectionprofiledthroughtheringrollingequipment.Astheformingmoldofringrolling,theworkingenvironmentisbad,subjectedtocyclicloading,iteasi
2、lyoccurstofatiguebreak.Itisthemainfailureproductionoftheprocessofthemanufactureofringrolling.Thecorerolleristheimportantpartoftheringrollingmachineandlosspart,thelifetimeofcorerollerdirectlyinfluencethemanufacturingcostandefficient.The5CrNiMocorerollerofspecificbusines
3、sinGuiyangisappliedastheresearchtarget.Thefracturefailureanalysis,theanalysisofthehotrollingringformingprocess,thefatiguelifecalculationandfatiguecrackpropagationarecarriedout,theresearchcontentsareasfollows:①Thefracturefailureanalysisofcorerolleriscarriedoutwiththehel
4、pofthefractographyanalysistechnologywhichismainlyconsistedbychemicalcompositionanalysis,hardnesstest,metallographicexaminationandSEManalysis,theresultsindicatethatthefailuremechanismisfatiguecrack.②BasedonABAQUS/Explicit,afiniteelementmodelofclosedradialringrollingwase
5、stablished,theprocessofformingofringrollingisoptimized.Theforceanalysisiscarriedoutandthestressandstraindistributionsofthedifferentregionsofcorerollerisacquired.③Onthebasisofthefiniteelementanalysisofthecoreroller,theS-Ncurveof5CrNiMoandloadspectrumofthecoreroller,thew
6、holelifesimulationanalysisofthecorerolleriscarriedoutwiththehelpoftheMSC.Fatigue.Therelationshipsbetweenfatiguetotallifeandvariousfactorssuchasloadingscalecoefficient,thewayofmachining,andthemethodofsurfacetreatment,performancesofmaterialhavebeenanalysised.④Accordingto
7、thelinearelasticmechanicstheory,crackpropagationanalysisofthecorerollerisanalysised.TheVonMisesstressnearthecracktipiscomparedagainsttheyieldstrengthofthematerial.TheModeIstressintensityfactoriscomparedagainstthematerial’sfracturetoughness.Thefatiguestrengthofthestruct
8、ureisrecommendedtobeassessedinthefuture.III重庆大学硕士学位论文Keywords:coreroller,HotRingRollingProcess,fracturefailure,fatigu
