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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.__~--尊捧工業(yè)大笑型逛塑逍塑里
8、這‘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衛(wèi)些壁工黛翱煮赳塑述一一--一一一本文的主要創(chuàng)新與貢獻(xiàn)(l)基于有限應(yīng)變彈塑性有限元法建立了符合實(shí)際的管彎曲回彈有限元模擬模型，對該模型建立過程中的關(guān)鍵技術(shù)問題進(jìn)行了研究。模擬中采用三維管彎曲幾何模型，并采用八節(jié)點(diǎn)實(shí)體單元實(shí)現(xiàn)計(jì)算模型的離散
