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ID:36629497
大小:2.14 MB
页数:65页
时间:2019-05-13
《板材液压成形数值模拟及成形性能预报模型研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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