基于數(shù)值模擬多步?jīng)_壓的回彈研究.pdf

1、江蘇大學(xué)碩士學(xué)位論文基于數(shù)值模擬多步?jīng)_壓的回彈研究姓名：方井柱申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：機(jī)械制造及其自動(dòng)化指導(dǎo)教師：袁國定20040326ABSTRACTAccordingtostatistic，60％～70％partsinvehicleareproducedbystampingprocessThequalityofdeformedsheetwillinfluenceassembly，appearanceandmanufacturingc

2、ost，developingrecycleofnewvehicleWrinkling，breakage，springbackandinsufficientstiffnessarethefourmaindefectsofsheetmetalforming，andspringbackisthemosthardtobecontrolledWhenspringbackexceedsthetolerance，thereisaformingdefe

3、ct，anditwillinfluencetheassemblySo，manyacademicsandspecialisthadmadewideandembeddedstudiesonspringbackUntilnowtheresearchersstillputemphasisonthestudyofspringbackofsimplebentparts，andsomeusefulwayswereappearedforcontroll

4、ingthespringbackHoweverthefinalpartofautopanelsneedsseveralprocessesSo，thestudyofspringbackaftermulti—stepformingofautopanelsisnecessaryNumericalsimulationmakesitpossibletocalculatespringbackaftermultistepformingofcompli

5、catedautopanelsFirstly，asimplepartwasdesigned(whosefinalshapeneedsbending，trimming，punching，sizingandflanging)tostudythenumericalsimulationtechnologyofspringbackaftermulti—stepformingbasedonDynaFormandLSDyna，andsometechn

6、iquesforimprovingconvergence，precision，efficiency，andtransferofthedeformedsheetmessagewereconcludedSecondly，accordingtothebenchmark’SboundaryconditionsofNumisheet’2002，thespringbackoffrontfenderwascomputed，and70％80％simul

7、ationprecisionwasreachedFinally，thisdissertationstudiedthespringbackaftermultistepformingusingIvecosidewallTheresultofsimulationiscoincidentwiththeexperimentspringbackwillappearwhenthestresswasdistributedagainafterunload

8、ing，theformerprocesswillinfluencethespringbackofsucceedingprocessTakinguseofNumericalSimulationhasthevalueofinstructingoptimizingdesignofdie，reducingrecycleofmanufacturingdieKEYWORDS：SpringbackAfterMultiStepForming，DieFa