基于有限元模擬的大型厚壁封頭熱拉深成形理論分析.pdf

1、重慶大學(xué)碩士學(xué)位論文基于有限元模擬的大型厚壁封頭熱拉深成形理論分析姓名：李海峰申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：陳明亮2000.12.14重慶大學(xué)碩士學(xué)位論文ABSTRACTABSTRACTTheformingprocessofthicksheetmetalisdifferentfromthatofthinoneA1thoughthedeformationmechanismoftheformeriSnotSOcomplica

2、tedasthelatter，itsformingismoredifficultthanthatofthinone，especiallythedome—shapedpartsproducedfromthicksheetmetalThispaperoverviewstheexistedformingprocessesofthickwalledhemisphericalhead；Bydividingtheplateblankintofour

3、regions：theflangeregion，thecircularbendingregionofcavitydie，theconeregionandthesphericalregion，thehotstampingprocessofthickhemisphericalheadissystematicallyanalyzedthroughthetraditionalengineeringmethodS1abMethodincludin

4、gthedistributionofstressesandthelawofitsthicknessvariationduringitsformingprocessTheauthor，then，employsaneffectiveanalysismethoHiniteElementMethod(FEM)andusestheadvancednon—1inearfiniteelementnumericalsimulationsoftware—

5、制^Rctosimulatetheprocessofhotstampingofthehead，andverifythevalidityofthetheoreticalanalysisMeanwhile，itsdeformationrulesarestudiedandtheresultsarecomparedwiththetheoreticalanalysiSTheinfluencesofvariouspracticalfactorsar

6、eanalyzed，suchastemperature，friction，etcTheformingdefectsarealSOforecastedandthesolutionstothemareprovided，especiallYtothebottomheadwhichprocessesirregularshapeBased0nthiS，thegeometricparametersoftheplatehilletsandtoolsf

7、ortheformingareoptimizedIntheend，theproblemofthebilletvolumelosingandthedevelopmenttrendsofthesimulationtechnologyoffiniteelementanalysiSarediscussedKeywords：sphericalhead，SlabMethod，stampingFiniteElementMethod(FEM)，MARC