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1、西北工业大学硕士学位论文AbstractThemachiningtechnologyofforgingteetubeismakinguseofcirculartubeblankandgainstubularcomponents.Itisaninnovativetechnique.Themachiningtechnologyofforgingteetubemakestheforgingpartsmasslight,intensionhigh,costlittleandmachiningexactness.S
2、oitistheimportantaspectin21centuryintheforgingandmachiningfields.Andsothetechnologyoftubebulgingformingisbeingtheimportantissue.Multi-tubehydroformingtheoryandmechanicalanalysesisintroducedinthispaperandanfiniteelementsimulationhydroformingmodelisestablis
3、hed.Thenusefiniteelementsimulationtechnology,appliedseveralgeometrymodelandmodelload,simulatedtheprocessofteetubebulgingformingwallteetube'sbulgingforming.Sowegetthehowhydroformingsmeasureandtechnologicalparameteraffectsthestress,strain,distortionandtubew
4、allthinning.Theseresultsarethebaseoftheteetubehydroformingtechnologicalparameter.Thispaper'simportantcontentandproductionare:1.Analysisthehydroformingtheorydeeply,hydroformingprocessandtechnologicalcharacteristic,deductthevaluesofshapedforcebyimportant-st
5、ressmeasure.Thesearethegoodbaseforteetubehydroformingprocess.2.Studyfiniteelementnumericalsimulationtechnologydeeply.Choosereasonableparameters,suchasfrictionalcondition,contactcondition,timestepsandconvergencecriterion.Setupthree-dimensionelastic-plastic
6、finiteelementmodel.3.Utilizedthemodelabove-mentioned,twodiferenttypesofloadingwereemployed:compoundbulgingandcombinedinternalpressureandaxialloading.Theeffectsoffrictionandloadpatternsareexamined,anddeformations,stressesandtubethinning/thickeningbehaviori
7、ntheformedcomponentarepresented.Analyticalresultsindicatedthat:1)Consideringnotonlythedeformingbutalsothestressandstrain,thecompoundpressureisbeterthanthecombinedinternalpressureandaxialloading.2)Wecangetbeterresultsbyapplyingleastfrictioncoefficientvalue
8、,mosttransitionalcircular-angleradiusvalueorcontrollingtheratioofpressureandaxialloadabout1:3.摘要臼口里巴巴口里弓里里里里口生里里3)Incompoundbulgingusingramploadpatternscanachievebeterresultsandloadpathsinfluencetheresultsobviously.
