完整版注塑模具外文翻译定稿毕业设计论文Word文件下载.docx

完整版注塑模具外文翻译定稿毕业设计论文Word文件下载.docx

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完整版注塑模具外文翻译定稿毕业设计论文@#@优秀论文审核通过@#@未经允许切勿外传@#@附录2@#@Integratedsimulationoftheinjectionmoldingprocesswithstereolithographymolds@#@AbstractFunctionalpartsareneededfordesignverificationtesting,fieldtrials,customerevaluation,andproductionplanning.Byeliminatingmultiplesteps,thecreationoftheinjectionmolddirectlybyarapidprototyping（RP）processofinjectionmoldingwithRPdemonstratedmanytimes.Whatismissingisthefundamentalunderstandingofandtheinjectionmoldingprocess.Inaddition,numericalsimulationtechniquesmolding.Butallcurrentsimulationpackagesforconventionalinjectionmoldingarenolongerapplicabletothisnewtypeofinjectionmolds,mainlybecausethepropertyofthemoldmaterialchangesgreatly.Inthispaper,anintegratedapproachtoaccomplishanumericalsimulationofinjectionmoldingintorapid-prototypedmoldsisestablishedandacorrespondingsimulationsystemisdeveloped.Comparisonswithexperimentalresultsareemployedforverification,whichshowthatthepresentschemeiswellsuitedtomoldingNumericalsimulationRapidprototyping@#@1Introduction@#@Ininjectionmolding,thepolymermeltattocreatethe@#@injectionmolddirectlybyarapidprototyping（RP）process.Byeliminatingmultiplesteps,thismethodoftoolingaproductionmaterial.ThepotentialofintegratinginjectionmoldingwithRPtechnologiesdemonstratedmanytimes.ThepropertiesofRPmoldsareverydifferentfromthoseoftraditionalmetalmolds.Thekeydifferencesarethepropertiesofthermalconductivityandelasticmodulus（rigidity）.Forexample,thepolymersusedinRP-fabricatedstereolithography（SL）moldsonethousandththatofanaluminumtool.InusingRPtechnologiestocreatemolds,theentiremolddesignandinjection-moldingprocessparametersneedtobemodifiedandoptimizedfromtraditionalmethodologiesduetothecompletelydifferenttoolmaterial.However,thereisstillnotafundamentalunderstandingofandtheinjectionmoldingprocessparameters.Onecannotobtainreasonableresultsbysimplychangingafewmaterialpropertiesincurrentmodels.Also,usingtraditionalapproacheswhenmakingactualpartsmaybegeneratingsub-optimalresults.Sothereisadireneedtostudytheinteractionbetweentherapidtooling（RT）processandmaterialandinjectionmolding,soastoestablishthemolddesigncriteriaandtechniquesforanRT-orientedinjectionmoldingprocess.@#@Inaddition,computersimulationisaneffectiveapproachforpredictingthequalityofmoldedparts.CommerciallyavailablesimulationpackagesofthetraditionalinjectionmoldingprocessprogramsforconventionalinjectionmoldingarenolongerapplicabletoRPmolds,becauseofthedramaticallydissimilartoolmaterial.Forinstance,inusingtheexistingsimulationsoftwarewithaluminumandSLmoldsandcomparingwithexperimentalresults,thoughthesimulationvaluesofpartdistortionarereasonableforthealuminummold,resultsareunacceptable,withtheerrorexceeding50%.Thedistortionduringinjectionmoldingisduetoshrinkageandwarpageoftheplasticpart,aswellasthemold.Forordinarilymolds,themainfactoristheshrinkageandwarpageoftheplasticpart,whichismodeledaccuratelyincurrentsimulations.ButforRPmolds,thedistortionofthemoldneglectedincurrentmodels.Forinstance,[3]usedasimplethree-stepsimulationprocesstoconsiderthemolddistortion,which.@#@Inthispaper,basedontheaboveanalysis,anewsimulationsystemforRPmoldsisdeveloped.Theproposedsystemfocusesonpredictingpartdistortion,whichisdominatingdefectinRP-moldedparts.ThedevelopedsimulationcanbeappliedasanevaluationtoolforRPmolddesignandprocessoptimization.Oursimulationsystemisverifiedbyanexperimentalexample.@#@AlthoughmanymaterialsareavailableforuseinRPtechnologies,weconcentrateonusingstereolithography（SL）,theoriginalRPtechnology,tocreatepolymermolds.TheSLprocessusesphotopolymerandlaserenergytobuildapartlayerbylayer.UsingSLtakesadvantageofboththecommercialdominanceofSLintheRPindustryandthesubsequentexpertisebasethatdevelopedforcreatingaccurate,andform-fitstudieswithverylimitedfunctionalapplications.However,thenewergenerationstereolithographicphotopolymersofthemoldingprocess@#@2.1Methodology@#@InordertosimulatetheuseofanSLmoldintheinjectionmoldingprocess,aniterativemethodisproposed.Differentsoftwaremodulesdevelopedandusedtoaccomplishthistask.ThemainassumptionisthattemperatureandloadboundaryconditionscausesignificantdistortionsintheSLmold.Thesimulationstepsareasfollows:

@#@@#@1Thepartgeometryismodeledasasolidmodel,whichistranslatedtoafilereadablebytheflowanalysispackage.@#@2Simulatethemold-fillingprocessofthemeltintoaphotopolymermold,whichwilloutput