机械专业毕业设计外文翻译Word文档下载推荐.doc

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一个集成的CAD/CAE/CAM系统在汽车冲压模具中的应用

机械专业外文翻译

ApplicationofanintegratedCAD/CAE/CAMsystemforstampingdiesforautomobiles

Bor-TsuenLin&

Chun-ChihKuo

Abstract

Theglobalizationandcompetitionintheautomobileindustrymakesitnecessarytoreducethetimespentonproductdevelopment.Therefore,computeraidedproductdevelopmenthasbecomeoneofthemostimportanttechniquesintheautomobileindustry.Accordingtotheconcurrentengineeringconcept,anintegratedCAD/CAE/CAMsystemforautomobilestampingdiedevelopmentisestablished.Thesystemisbasedon3DsurfaceconstructionCADsoftwareSTRIM,CAD/CAEsoftwareCATIA,stampingformabilityanalysissoftwareDYNAFORM,CAMsoftwareCADCEUS,astampingdesignknowledge-basedsystem,andaproductdatabase.Thispaperusesthedevelopmentoftrunklidouterpanelsasanexampletoshowcasethepowerofthesystem,inwhichthedifferentdevelopmentstagescanbeperformedsimultaneously.Thesystemcangreatlyreducethedevelopmenttimeandcost,improvetheproductquality,andpushproductsintothemarketinarelativelyshorttime.

1Introduction

Sincestampingpartshaveconsiderablepotentialbecauseoftheircompetitiveproductivityandperformance,theyhavebeenwidelyusedintheautomotiveindustry.However,themanufacturingindustryhasthreemajorgoals:

toimproveproductquality,toreducedevelopmentcost,andtoreducethetimespentondevelopment.Inordertoachievethesegoals,weneedtobringinnewtechnologies.

Fromthemanufacturingviewpoint,themajorrequirementformostapplicationsofsheetmetalisgoodformability[1].Giventhatpartsurfaceshavebecomemoreandmorecomplexandsharp-edged,weneedtotakeadvantageofformabilityanalysistounderstandtheirstampingproperties.In1963,KeelerandBackofen[2]introducedtheconceptofforminglimitdiagrams（FLDs）.

Theyanalyzedtheshapeandsizeforanetchedcircle-gridofsheetmetalafterithadbeenstamped.Thistechniquehasbeenwidelyusedinsheetmetalformabilityanalysissincethen.Recently,softwarethatusesafiniteelementmethodhasbeenusedtoanalyzeandsimulatesheetmetal

formability.ChenandLiu[3]combinedcircle-gridanalysiswithformabilityanalysistoidentifyanoptimaldieface,sothatthesplitdefectatthedrawn-cupwallintherearfloorpanelcouldbeavoided.Makinouchi[4]usedformabilityanalysissoftwaretoanalyzefourstampingparts—fenders,

trunklidouterpanels,sideframeouterpanels,andtirediskwheels—andtopredicttheirblankgeometry,springback,sheetthickness,residualstress,andcommondefectsafterstamping.Bigotetal.[5]developedamethodologytovalidatethemodelingofanaluminumformingprocessbasedondimensionalcharacterizationandfiniteelementcomparison.Takingadvantageofartificialneuralnetwork,knowledgebasedsystemsandfiniteelementanalysis,Pilanietal.[6]proposedamethodforautomaticallygeneratinganoptimaldiefacedesignbasedondiefaceformabilityparameters.

Sincediestructuresarebecomingmoreandmorecomplexandlarge-sized,wemustuseasolidmodelindiedesigntoavoidanypotentialinterferenceamongthevariouscomponents.Moreover,thesolidmodelcanbeusedforbuildingdissolvemodelsandestimatingthefragilesectionofdiestructures.Therefore,itisnecessarytousea3DCAD/CAE/CAMsystemtobuildsolidmodels,to

developCNCtoolingpathprograms,andtoanalyzethestressofdiestructureswhendevelopingstampingdies.NahmandIshikawa[7]utilizedtheset-baseddesignapproachwiththeparametricmodelingtechniquetohandletheuncertaintiesthatareintrinsicatearlystagesofthedesign.Parketal.[8]combinedaCAD/CAMsystemwithaknowledge-basedsystemtodevelopdeepdrawingdiesof

themotorhousing.Chengetal.[9]usedVisualC++programmingtocreateCADsoftwarefortheconceptualdesignofthescrollcompressor,andfabricatearealorbitingscrollpartonaCNCmachiningcenter.

Theglobalizationandcompetitionintheautomotiveindustrymakesitnecessarytoreducethetimespentonproductdevelopment.Networksarewidelyusednowadays.Asaresult,KaoandLin[10]designedasystemthatusesalocalareanetworkandtheInternettoallowtwogeographically

dispersedCAD/CAMuserstosimultaneouslyworkonthedevelopmentofproducts.Kongetal.[11]developedanInternet-basedcollaborationsystemforapressdiedesignprocessforautomobilemanufacturerstosheardesignmodelsandanalysisresults.Moreover,anintegratedCAD/CAE/CAMsystemcantremendouslyimproveproductivity.XuandWang[12]usedthemulti-modeltechnologyandanintegratedCAD/CAE/CAMsystemtodevelopcylinderhead.Yueetal.[13]tookadvantageoftheconcurrentengineeringco