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外文翻译--对聚合物的温度和凝固冷却系统在注射成型的影响 英文版【优秀】.pdf

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外文翻译--对聚合物的温度和凝固冷却系统在注射成型的影响 英文版【优秀】.pdf

TEMPERATUREPUJOS,CEDEX,GREATMOLDINGNUMERCOOLINGISTOEFFECTANDQUALITYFASTESTLARINDUSTRIEINCREASEWELLKNOWNECONOMICALLYMERMELTSUFFICIENTLYSOTHATTHEPARTCANBEEJECTEDWITHOUTANYSIGNIFICANTDEFORMATION2ANEFFICIENTCOOLINGSYSTEMDESIGNOFTHECOOLINGCHANNELSAIMINGATREDUCINGCYCLETIMEMUSTMINIMIZESUCHUNDESIREDDEFECTSASSINKMARKS,DIFFERENTIALSHRINKAGE,THERMALRESIDUALSTRESSBUILTUPANDPARTWARPAGEDURINGTHEPOSTFILLINGANDCOOLINGSTAGESOFINJECTIONMOLDING,HOTMOLTENPOLYMERTOUCHESTHECOLDMOLDWALL,ANDASOLIDLAYERFORMSONTHEWALLTIONTOTHECOOLANTMOVINGTHROUGHTHECOOLINGCHANNELSANDBYNATURALCONVECTIONTOTHEAIRAROUNDTHEEXTERIORMOLDSURFACETHECOOLANTISFLOWINGTHROUGHTHECHANNELSATAGIVENFLOWRATEANDAGIVENTEMPERATUREWHICHISCONSIDEREDCONSTANTTHROUGHOUTTHELENGTHOFTHECHANNELINTHISWORK,TIMEDEPENDENTTWODIMENSIONALMODELISCONSIDEREDWHICHCONSISTSOFANENTIRECOMPUTATIONALDOMAINOFTHECAVITY,MOLDANDCOOLINGCHANNELSURFACESTHECYCLICTRANSIENTTEMPERATUREDISTRIBUTIONOFTHEMOLDANDPOLYMERTSHAPECANBEOBTAINEDBYSOLVINGTHETRANSIENTENERGYEQUATIONCORRESPONDINGAUTHORTEL330540006348;FAX330540002731APPLIEDTHERMALENGINEERING2920091786–1791CONTENTSLISTSAVAILABLEEMAILADDRESSHASSANENSCPBFRHHASSANCESSWHEREPOLYMERISINJECTEDINTOAMOULDCAVITY,ANDSOLIDIFIESTOFORMAPLASTICPARTTHEREARETHREESIGNIFICANTSTAGESINEACHCYCLETHEFIRSTSTAGEISFILLINGTHECAVITYWITHMELTHOTPOLYMERATANINJECTIONTEMPERATUREFILLINGANDPOSTFILLINGSTAGEITISFOLLOWEDBYTAKINGAWAYTHEHEATOFTHEPOLYMERTOTHECOOLINGCHANNELSCOOLINGSTAGE,FINALLYTHESOLIDIFIEDPARTISEJECTEDEJECTIONSTAGETHECOOLINGSTAGEISOFTHEGREATESTIMPORTANCEBECAUSEITSIGNIFICANTLYAFFECTSTHEPRODUCTIVITYANDTHEQUALITYOFTHEFINALPRODUCTITISWELLKNOWNTHATMORETHANSEVENTYPERCENTOFTHECYCLETIMEINTHEINJECTIONMOLDINGPROCESSISSPENTINCOOLINGTHEHOTPOLYDISTRIBUTIONOFTHEMOLDANDPOLYMER,THEREFORE,THEIREFFECTONTHESOLIDIFICATIONDEGREEOFTHATPOLYMERAFULLYTRANSIENTMOLDCOOLINGANALYSISISPERFORMEDUSINGTHEFINITEVOLUMEMETHODFORATSHAPEPLASTICMOLDWITHSIMILARDIMENSIONSTO5,ASSHOWNINFIG1DIFFERENTCOOLINGCHANNELSPOSITIONSANDFORMSARESTUDIED2MATHEMATICALMODELTHEHEATOFTHEMOLTENPOLYMERISTAKENAWAYBYFORCEDCONVEC1INTRODUCTIONPLASTICINDUSTRYISONEOFTHEWORLD’SRANKEDASONEOFTHEFEWBILLIONDOLINJECTIONMOLDEDPARTSCONTINUESTOPLASTICINJECTIONMOLDINGPROCESSISCIENTMANUFACTURINGTECHNIQUESFORPRECISIONPLASTICPARTSWITHVARIOUSSHAPESATLOWCOST1THEPLASTICINJECTIONMOLDING13594311/SEEFRONTMATTERC2112008ELSEVIERLTDALLDOI101016/JAPPLTHERMALENG200808011GROWINGINDUSTRIES,SDEMANDFOREVERYYEARBECAUSEASTHEMOSTEFFIPRODUCINGOFANDCOMPLEXGEOMETRYPROCESSISACYCLICPROASTHEMATERIALCOOLSDOWN,THESOLIDSKINBEGINSTOGROWWITHINCREASINGTIMEASTHECOOLINGCONTINUESUNTILTHEENTIREMATERIALSOLIDIFIESOVERTHEYEARS,MANYSTUDIESONTHEPROBLEMOFTHEOPTIMIZATIONOFTHECOOLINGSYSTEMLAYOUTININJECTIONMOLDINGANDPHASECHANGEOFMOLDINGPROCESSHAVEBEENMADEBYVARIOUSRESEARCHERSANDONESWHICHFOCUSEDINTENSITYONTHESETOPICSANDWILLUSEDINOURSYSTEMDESIGNANDVALIDATIONSARE3–6THEMAINPURPOSEOFTHISPAPERISTOSTUDYTHEEFFECTOFTHECOOLINGCHANNELSPOSITIONANDITSCROSSSECTIONSHAPEONTHETEMPERATURECOOLINGSYSTEMLEADSTOMINIMUMCOOLINGTIMEISNOTACHIEVINGUNIFORMCOOLINGTHROUGHOUTTHEMOULDC2112008ELSEVIERLTDALLRIGHTSRESERVEDEFFECTOFCOOLINGSYSTEMONTHEPOLYMERDURINGINJECTIONMOLDINGHAMDYHASSAN,NICOLASREGNIER,CEDRICLEBOT,CYRILLABORATOIRETREFLEBORDEAUX1UMR8508,SITEENSCPB,16AVPEYBERLAND,33607PESSACARTICLEINFOARTICLEHISTORYRECEIVED15NOVEMBER2007ACCEPTED19AUGUST2008AVAILABLEONLINE30AUGUST2008KEYWORDSPOLYMERSOLIDIFICATIONINJECTIONMOLDINGABSTRACTCOOLINGSYSTEMDESIGNISOFISCRUCIALNOTONLYTOREDUCEITYOFTHEFINALPRODUCTAPERFORMEDACYCLICTRANSIENTOFTHEMOLDCOOLINGSTUDYCOOLINGSYSTEMDESIGNTHETUREDISTRIBUTIONOFTHEMOLDTIVITYOFTHEPROCESS,THECOOLINGSHOULDBENECESSARYFORTHEAPPLIEDTHERMALJOURNALHOMEPAGEWWWELSEVIRIGHTSRESERVEDGUYDEFAYEFRANCEIMPORTANCEFORPLASTICPRODUCTSINDUSTRYBYINJECTIONMOLDINGBECAUSEITCYCLETIMEBUTALSOITSIGNIFICANTLYAFFECTSTHEPRODUCTIVITYANDQUALICALMODELINGFORATMOLDPLASTICPARTHAVINGFOURCOOLINGCHANNELSISANALYSISUSINGAFINITEVOLUMEAPPROACHISCARRIEDOUTTHEOBJECTIVEDETERMINETHETEMPERATUREPROFILEALONGTHECAVITYWALLTOIMPROVETHEOFCOOLINGCHANNELSFORMANDTHEEFFECTTHEIRLOCATIONONTHETEMPERATHESOLIDIFICATIONDEGREEOFPOLYMERARESTUDIEDTOIMPROVETHEPRODUCTIMESHOULDBEMINIMIZEDANDATTHESAMETIMEAHOMOGENEOUSCOOLINGOFTHEPRODUCTTHERESULTSINDICATETHATTHECOOLINGSYSTEMWHICHANDSOLIDIFICATIONATSCIENCEDIRECTENGINEERINGERCOM/LOCATE/APTHERMENGDISSIPATIONOFTHEHEATTHROUGHPHASECHANGEPROCESSTHISTECHPLICIT/IMPLICITTECHNIQUEALREADYVALIDATEDINPREVIOUSSTUDIESBYVINCENT8,ANDLEBOT9THATISBASEDONTHETECHNIQUE‘‘NEWSOURCE”OFVOLLER10THISMETHODPROPOSESTOMAINTAINTHENODESWHEREPHASECHANGEOCCURSTOTHEMELTINGTEMPERATURETHISSOLUTIONISREPEATEDUNTILTHECONVERGENCEOFTHETEMPERATUREWITHTHESOURCETERMEQUALSTOTHELATENTHEATTHESOURCETERMISDISCRETIZEDBYSCQLFOFSOTQLFFN1SC0FNSDT5THESOLIDFRACTIONWHICHISFUNCTIONOFTHETEMPERATUREISLINEARIZEDASNOMENCLATURECPJ/KGKSPECIFICHEATATCONSTANTPRESSUREFSSOLIDFRACTIONHW/M2KHEATTRANSFERCOEFFICIENTKNUMBEROFTHEINTERNALITERATIONSLLATENTHEATOFFUSION,J/KGNNUMBEROFTHEEXTERNALITERATIONSNNORMALDIRECTIONSCSOURCETERMTKTEMPERATURETSTIMEHHASSANETAL/APPLIEDTHERMALENGINEERINGNIQUEISAPPLIEDONFIXEDNODESANDTHEENE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

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