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1、-一一一一一一一一一一NJL逃主AbstractThethin-walltubesarewidelyusedinlotsoffieldsbecauseoftheirexcellentproperties,variousfunctionsandhigefeature-priceratio,suchasinaviationandastronavigationfieldsetc.Thespringbackwhichhappensconsequentiallyafterunloadingisaflawwhich
2、acutelyreducedtheefficientproductionofthetubes,andatpresent,muchresearchworkhavebeendoneaboutfindingtheappropriatesolutiontothespringback.Thispaperconductedthedetailedresearchtoobtaintherulesexistinginthebendingspringbackphenomenonofthestainlesssteeltube
3、andtheAl-alloytube,basedontheelasto-plasticityFEM.Themainresearchcontentandachievementsareasfollows:(1)Basedontheresearchoftheformingmechanismoftubebending,theelastic-plasticFEMsimulationmodelwhichisveryimportanttotheresearchofthespringbackrulesofbending
4、tubehasbeenestablished,theessentialtechnicalquestionstocarryoutthesimulationwastreatedaswell.Thedeformingbodywasdispersedbyeight-nodesolidelement,andsurface-to-surfacecontactelementwasusedforcreatingthecontactpair,besides,theCoulombfrictionmodelwasusedto
5、solvethefrictionquestionsbetweencontactfaces(2)BasedonthetubebendingFEMsimulationmodel,thetubebendingspringbackruleunderthediferentcraftparametersandthematerialparameterswasstudied.Theresultsindicatedthatthespringbackquantityofbenttubegrowswiththeincreas
6、ingoftheelbowpieceangle,therelativebendingradiusandthegapbetweenthecorecraftandthetubewall,fallsdownwiththeincrementofmaterialhardeningindexvalue,andincreaseswiththeincrementofthematerialhardeningcoeficientvalue.(3)Basedontheobtainedbent-tube'sspringback
7、rules，theVBlanguage,theSQLlanguageandMicrosoftAccessdatabasesoftware,anover-bendingcompensatesystemoftheNCtubebendingspringbackwasdesignedanddeveloped.Thissystemcanprovideafeasiblemethodtocompensatethespringbackangleoftubebendingprocess.__~--尊捧工业大笑型逛塑逍塑里
8、这‘一一一一一一一一一一Keywordsthin-walltube,NCbendingprocess,springback,FEMsimulation,thecompensate一一一一一一一一一一一互韭卫些壁工黛翱煮赳塑述一一--一一一本文的主要创新与贡献(l)基于有限应变弹塑性有限元法建立了符合实际的管弯曲回弹有限元模拟模型，对该模型建立过程中的关键技术问题进行了研究。模拟中采用三维管弯曲几何模型，并采用八节点实体单元实现计算模型的离散
