基于数值模拟技术的板料成形回弹预测的研究

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1、华南理工大学硕士学位论文基于数值模拟技术的板料成形回弹预测的研究姓名：席国艳申请学位级别：硕士专业：机械制造及其自动化指导教师：阮锋20050501华南理T大学硕士学位论文AbstractSheetmetalformingisaveryimportantmanufacturingtechnologyinmodernindustry，thespringbackphenomenonisaninescapableproblemofbending，andspringbackinsheetmetalmakethesheetmetal担shapeapartfromtheshapeoft

2、hetoolsafterformingprocessanditwillinfluenttheproducts?dimensionprecision．Ifthespringbackinsheetmetalcanbepredictedbeforeforming，wecancompensateitinthestageofmolddesigning，andcanimprovetheproducts?precisionandsavelargemanpowerandmaterialresources．Becauseinfluencedbymanyfactors，SOitisdiffic

3、ulttoexpressthespringbackintheory，thesheetmetalformingnumericalsimulationbaseonthefiniteelementtechnologymakeitispossibletosolvetheproblem．inthispaperselecttheU—shapeasthestudyobject，studythespringbackruleofthiskindofproductscombinedwiththenumericalsimulationtechnology．Sheetmetalformingnum

4、ericalsimulationisastrongnonlinearproblemincludinggeometricnonlinear，materialnonlinearandcontactnonlinear，andtheprecisionofnumericalsimulationisinfluencetheprecisionofthespringbackprediction，inthispaper，thekeytechnologyofnumericalsimulationisdescribedindetail，andusetheU—typedsheetpartsdeep

5、drawspringbackinUMISHEET’93toverifythereliabilityofthekeytechnology．Thespringbackinsheetmetalformingisinfluencedbymanyfactors，itisimpossibletobuildamathematicsmodelofthespringbackpredictionmodelincludeallofthesefactors，inthispaper，designtheexperimentsofthesefactors，collecttheexperiments?da

6、tawiththenumericalsimulationmethods，andusethisdatatocollateandfilterthefactorsduetoitsinfluentdegreeofspringback，andanalysetheinfluenttrendofeachfactor．Thendesignnewexperimentsofthereservedfactors，andstatisticregressofthegreatdealofexperimentaldata，tothetwokindsofbendingmethods⋯一freebendin

7、gandcorrectbending，builttherelevantmathematicsmodelsofthespringbackprediction，theindependentvariableinthemodelsincludematerialspropertiesparameters，relativebendingradiusofworkpieceandtheclearancebetweendieandpunch．Wealsodesignmanyexperimentstoverifythetwokinds