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外文翻译--类神经网路的自由曲面注塑模具浇口优化设计 英文版.pdf

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外文翻译--类神经网路的自由曲面注塑模具浇口优化设计 英文版.pdf

INTJADVMANUFTECHNOL200117297–3042001SPRINGERVERLAGLONDONLIMITEDOPTIMUMGATEDESIGNOFFREEFORMINJECTIONMOULDUSINGTHEABDUCTIVENETWORKJCLINDEPARTMENTOFMECHANICALDESIGNENGINEERING,NATIONALHUWEIINSTITUTEOFTECHNOLOGY,YUNLIN,TAIWANTHISSTUDYUSESTHEINJECTIONPOSITIONANDSIZEOFTHEGATEASTHEMAJORCONTROLPARAMETERSFORASIMULATEDINJECTIONMOULDONCETHEINJECTIONPARAMETERSGATESIZEANDGATEPOSITIONAREGIVEN,THEPRODUCTPERFORMANCEDEFORMATIONCANBEACCURATELYPREDICTEDBYTHEABDUCTIVENETWORKDEVELOPEDTOAVOIDTHENUMEROUSINFLUENCINGFACTORS,FIRSTTHEPARTLINEOFTHEPARAMETEREQUATIONISCREATEDBYANABDUCTIVENETWORKTOLIMITTHERANGEOFTHEGATETHEOPTIMALINJECTIONPARAMETERSCANBESEARCHEDFORBYASIMULATIONANNEALINGSAOPTIMISATIONALGORITHM,WITHAPERFORMANCEINDEX,TOOBTAINAPERFECTPARTTHEMAJORPURPOSEISSEARCHINGFORTHEOPTIMALGATELOCATIONONTHEPARTSURFACE,ANDMINIMISINGTHEAIRTRAPANDDEFORMATIONAFTERPARTFORMATIONTHISSTUDYALSOUSESAPRACTICALEXAMPLEWHICHHASBEENANDPROVEDBYEXPERIMENTTOACHIEVEASATISFACTORYRESULTKEYWORDSABDUCTIVENETWORK;INJECTIONMOULD;SIMULATIONANNEALINGSA1INTRODUCTIONOWINGTOTHERAPIDDEVELOPMENTOFINDUSTRYANDCOMMERCEINRECENTYEARS,THEREISANEEDFORRAPIDANDHIGHVOLUMEPRODUCTIONOFGOODSTHEPRODUCTSAREMANUFACTUREDUSINGMOULDSINORDERTOSAVETHETIMEANDCOSTPLASTICPRODUCTSARETHEMAJORITYOWINGTOTHESEPRODUCTSNOTREQUIRINGCOMPLICATEDPROCESSESITISPOSSIBLETOCOPEWITHMARKETDEMANDSPEEDILYANDCONVENIENTLYINTRADITIONALPLASTICPRODUCTION,THEDESIGNSOFTHEPORTIONSOFTHEMOULDAREDETERMINEDBYHUMANSHOWEVER,BECAUSEOFTHEINCREASEDPERFORMANCEREQUIREMENTS,THECOMPLEXITYOFPLASTICPRODUCTSHASINCREASEDFIRST,THEGEOMETRICSHAPESOFTHEPLASTICPRODUCTSAREDIFFICULTTODRAW,ANDTHEINTERNALSHAPEISOFTENCOMPLEXWHICHALSOAFFECTSTHEPRODUCTIONOFTHEPRODUCTINJECTIONPROCESSINGCANBEDIVIDEDINTOTHREESTAGESCORRESPONDENCEANDOFFPRINTREQUESTSTODRJCLIN,DEPARTMENTOFMECHANICALDESIGNENGINEERING,NATIONALHUWEIINSTITUTEOFTECHNOLOGY,YUNLIN632,TAIWANEMAILLINRCKSUNWSNHITEDUTW1HEATTHEPLASTICMATERIALTOAMOLTENSTATETHEN,BYHIGHPRESSURE,FORCETHEMATERIALTOTHERUNNER,ANDTHENINTOTHEMOULDCAVITY2WHENTHEFILLINGOFTHEMOULDCAVITYISCOMPLETED,MOREMOLTENPLASTICSHOULDBEDELIVEREDINTOTHECAVITYATHIGHPRESSURETOCOMPENSATEFORTHESHRINKAGEOFTHEPLASTICTHISENSURESCOMPLETEFILLINGOFTHEMOULDCAVITY3TAKEOUTTHEPRODUCTAFTERCOOLINGTHOUGHTHEFILLINGPROCESSISONLYASMALLPROPORTIONOFTHECOMPLETEFORMATIONCYCLE,ITISVERYIMPORTANTIFFILLINGININCOMPLETE,THEREISNOPRESSUREHOLDINGANDCOOLINGISREQUIREDTHUS,THEFLOWOFTHEPLASTICFLUIDSHOULDBECONTROLLEDTHOROUGHLYTOENSURETHEQUALITYOFTHEPRODUCTTHEISOTHERMALFILLINGMODELOFANEWTONIANFLUIDISTHESIMPLESTINJECTIONMOULDFLOWFILLINGMODELRICHARDSON1PRODUCEDACOMPLETEANDDETAILEDCONCEPTTHEMAJORCONCEPTISBASEDONTHEAPPLICATIONOFLUBRICATIONTHEORY,ANDHESIMPLIFIEDTHECOMPLEX3DFLOWTHEORYTO2DHELESHAWFLOWTHEHELESHAWFLOWWASUSEDTOSIMULATETHEPOTENTIALFLOWANDWASFURTHERMOREUSEDINTHEPLASTICITYFLOWOFTHEPLASTICHEASSUMEDTHEPLASTICITYFLOWONANEXTREMELYTHINPLATEANDFULLYDEVELOPEDTHEFLOWBYIGNORINGTHESPEEDCHANGETHROUGHTHETHICKNESSKAMALETALUSEDSIMILARMETHODSTOOBTAINTHEFILLINGCONDITIONFORARECTANGULARMOULDCAVITY,ANDTHEANALYTICALRESULTOBTAINEDWASALMOSTIDENTICALTOTHEEXPERIMENTALRESULTPLASTICMATERIALFOLLOWSTHENEWTONIANFLUIDMODELFORFLOWINAMOULDCAVITY,ANDBIRDETAL2–4DERIVEDMOULDFLOWTHEORYBASEDONTHISWHENTHESHAPEOFAMOULDISCOMPLICATEDANDTHEREISVARIATIONINTHICKNESS,THENTHEEQUILIBRIUMEQUATIONSCHANGESTONONLINEARANDHASNOANALYTICALSOLUTIONTHUS,ITCANBESOLVEDONLYBYFINITEDIFFERENCEORNUMERICALSOLUTIONS2,5OFCOURSE,ASTHEPOLYMERISAVISCOELASTICFLUID,ITISBESTTOSOLVETHEFLOWPROBLEMBYUSINGVISCOELASTICITYEQUATIONSIN1998,GOYALETALUSEDTHEWHITEMETZNERVISCOELASTICITYMODELTOSIMULATETHEDISKMOULDFLOWMODELFORCENTRALPOURINGMETZNER,USINGAFINITEDIFFERENCEMETHODTOSOLVETHEGOVERNINGEQUATION,FOULDTHEVISCOELASTICITYEFFECTWOULDNOTCHANGETHEDISTRIBUTIONOFSPEEDANDTEMPERATUREHOWEVER,ITAFFECTSTHESTRESSFIELDVERYMUCHIFITISAPUREVISCOELASTIC298JCLINFLOWMODEL,THEPOPULARGNFMODELISGENERALLYUSEDTOPERFORMNUMERICALSIMULATIONCURRENTLY,FINITEELEMENTMETHODSAREMOSTLYUSEDFORTHESOLUTIONOFMOULDFLOWPROBLEMSOTHERMETHODSAREPUREVISCOELASTICMODELS,SUCHASCFOLWANDMOLDFLOWSOFTWAREWEUSEDTHISMETHODASWELLSOMESOFTWAREEMPLOYSTHEVISCOELASTICWHITE–METZNERMODEL,BUTITISLIMITEDTO2DMOULDFLOWANALYSISSIMPLEMOULDFLOWANALYSISISLIMITEDBYCPUTIMEFORTHECOMPLICATEDMOULDSHAPES,PAPTHANASIONETALUSEDUCMFLUIDFORFILLINGANALYSIS,USINGAFINITEDIFFERENCEMETHODANDBFCCCOORDINATIONSYSTEMAPPLICATIONFORTHESOLUTIONOFTHEMORECOMPLICATEDMOULDSHAPEANDFILLINGPROBLEM,BUTITWASNOTCOMMERCIALISED6MANYFACTORSAFFECTPLASTICMATERIALINJECTIONTHEFILLINGSPEED,INJECTIONPRESSUREANDMOLTENTEMPERATURE,HOLDINGPRESSURE7–12,COOLINGTUBE13,14ANDINJECTIONGATEAFFECTTHEACCURACYOFTHEPLASTICPRODUCT,BECAUSE,WHENTHEINJECTIONPROCESSINGISCOMPLETED,THEFLOWOFMATERIALINTHEMOULDCAVITYRESULTSINUNEVENTEMPERATUREANDPRESSURE,ANDINDUCESRESIDUALSTRESSANDDEFORMATIONOFTHEWORKPIECEAFTERCOOLINGITISDIFFICULTTODECIDEONTHEMOULDPARTSURFACEANDGATEPOSITIONSGENERALLY,THEMOULDPARTSURFACEISLOCATEDATTHEWIDESTPLANEOFTHEMOULDSEARCHINGFORTHEOPTIMALGATEPOSITIONDEPENDSONEXPERIENCEMINIMALMODIFICATIONTOTHEMOULDISREQUIREDIFYOUARELUCKYHOWEVER,THETIMEANDCOSTREQUIREDFORTHEMODIFICATIONOFMO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