板材液压成形数值模拟及成形性能预报模型研究

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1、广东工业大学硕士学位论文板材液压成形数值模拟及成形性能预报模型研究姓名：直妍申请学位级别：硕士专业：材料加工工程指导教师：阳林20050526ABSTRACT承彩伊Hydroforminghastwofashions，oneisthatliquidrepIacespunch，帆qisthatliquidreplacesdie．Inthispaper，researchtheformer．Becauseofsinlplemouldandsuittocomplexshape，a1ittleofbatchpart，thetechnicshasmanyvirtues．B

2、utduetothecomplicationOfitsformingme曲anism，itisnecessarytotrialandtestsftequentlyinthepast，obtainedtechnologyparametersofaconcretepart．Inrecentyears，withthedeVelopmentofFEMtechnology，thenumericalsimulationmethodisaIsobeenaanaIysistoolforhydroformingprocess．1nthispaper，howtorealizeth

3、ecomputersimulationofthehydroformingpfocessismOstlyintroducedandtheef殆ctsoftechn0109yimportantparametersarcilluminatedbysimulating．Anexpe“mentforhydfoformiBgiBmadeout．thecoincidenceofresultsfromex口erimentalandsimulationcalculationverinesthereliabilityofthesimulation．Fufthermore，twot

4、yplcalexamPlesthattheyarehalfballpartandcomplexcavity((motorcycleoil)aretakeⅡ．Abomtheformer，thedistributjonoft11ethicknessisanalyzed．Thedeformationlawofthesheetpartsduringhydrofbrminghadbeenresearched．Aboutthelatter，throughnumericalsimulation，thekeyparameterseffectinghydrofofming，li

5、quidpressureandblall

6、【hoIdeingfbrce，arecalculated．stressandstraindistributionduringhydrofbrmingisanalyzedandplaceswherewrinkiingandrupturemayoccurarepredicted．Furthermore，thereasonsfbrwrinklingatcofnersareinvestjgated．Numericalsimulationisalsoappliedforhydorfomingofcomplicated曲oxsha

7、pedpartswithdrawbeads．Theresultsindicated￡hatappropriatedrawbeadsreasonablydistributingtheflowresistanceonareaofnange，whichcontfibutestoeliminatethewrinklingpossibilityatcorners，Finally，inthispaperaforecastmodelaboutblankfbrmingresultwhichbasedonartificialneuralnetworkisprovided．The

8、forecastmodelhasthreethree—layerBPnetworkstructureandforecastblankformingresult．Itisanewthoughtfordeterminingblankformingresult．ThemodelreducestheamountsofcomputerIIslmulatlOn．Inthispaper，anewmethodtoresolVepracticalproblemsisproVidedbytakingadvan协geofcomputerfiniteelementsimulation

9、ofhydroformingproce