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ID:20850996
大小:2.13 MB
页数:54页
时间:2018-10-17
《汽车减震器端盖多次拉深数值模拟及工艺稳健优化设计》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、江苏大学硕士学位论文ABSTRACTMulti—stepsdeepdrawingisoftenusedwhentheformlessofmanypartshappenswithasingleprocessinstampingpartsproduction.Multi—stepsdeepdrawinghassomedifferencesfromone-stepforming,thedeformationmechanismiscomplicatedandthedeformationruleisdifficulttodescribe.Sotheintensivestudyofnumericals
2、imulationcalculationonmulti—stepsdeepdrawingisveryvaluableinpredictingvariousdefects,seekingforanoptimizationmethodforsheetmetalforming,reducing.productdevelopmentcyclesandguidingmulti—stagepractice.Inthisdissertation,thebasicfiniteelementtheorybasedonnon—linerfinitedeformationwasexpounded.Theform
3、ingcharacteristicsofshockabsorberlidwereanalyzedandthenumericalsimulationmethodwasadoptedtoestimatethedefectsattwo—stepsstampingbasedonthemodelwithmiddleprocesshole.ByusingthefiniteelementcodeDYNAFORM,theformingprocessbasedonthemodelwithcentralprocessholewassimulated.Thesimulationresultshowsthatby
4、punchingthecentralprocesshole,theplasticflowuniformitycanbeincreasedandtheratioofthinningreduced.Inaddition,crackcanbemoreeffectivelycontrolledandtheformingqualitycanbeimproved.Theresearchworkofprocessparameterswhichisregardasthepreparationbeforerobustoptimizationdesignwasalsocarriedout.Theparamet
5、errobustoptimizationofthestampingdrawingprocessofshockabsorberlidisamultifactorproblem.Therobustoptimizationdesignwasadoptedforthischaracteristic.Animprovedresponsesurfacemodelbasedonrobustdesignwasadopted,whichcombinestheadvantagesoftheorthogonalexperimentaldesignandtheregressionanalysis.Twokeyfa
6、ctors(diameterofcentralprocesshole,frictioncoefficient)hadbeen汽车减震器端盖多次拉深数值模拟及工艺稳健优化设计selectedfrommanyprocessparametersinordertocontroltheformingquality.Andtheotherswereratedasthenoisefactors.BymeansofMATLAB,therobustoptimalsolutionofthekeyfactorswasobtained:diameterofcentralprocesshole12.6mmandfr
7、ictioncoefficientO.11.Undertheinfluenceofthenoisefactors,numericalsimulationbasedontherobustoptimalsolutionwasperformed.TherangeofthemaximumthinningratioinsheetmetalformingislessthanO.2%.Thereforetherobustoptimal
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