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外文翻译--气辅注射成型.doc

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外文翻译--气辅注射成型.doc

附件2外文原文GASASSISTEDINJECTIONMOLDINGINJECTIONMOLDINGISAVERYPOPULAROPERATIONFORPRODUCTIONOFCOMMERCIALPLASTICPARTSWITHITSSOPHISTICATEDCONTROLANDSUPERIORSURFACEDETAILSHOWEVER,ITHASLIMITATIONS,SUCHASLONGCYCLETIMEFORPARTSWITHTHICKSECTIONSDUETOSLOWCOOLINGALSOPACKINGOFTHICKSECTIONSCANPRODUCESINKMARKSONTHEPARTSURFACELARGETHINPARTSCANHAVEWARPAGEBECAUSETHERESIDUALSTRESSANDSTRAININDUCEDDURINGFILLINGANDPACKINGTHUSTRADITIONALINJECTIONMOLDINGCANBEMODIFIEDTOSOLVETHESEKINDSOFPROBLEMS,ALSOTOIMPROVETHEQUALITYOFTHEPARTANDLOWERTHECOSTOFPRODUCTIONCURRENTLY,GASASSISTEDINJECTIONMOLDINGISINUSEANDBEINGDEVELOPEDWORLDWIDEINTHEUS,THEPROCESSISKNOWNASGASASSISTEDINJECTIONMOLDINGGAIM;ITISALSOCALLEDGASINJECTIONTECHNIQUEGITINEUROPESEEFIG431THISPROCESSISDEVELOPEDFORTHEPRODUCTIONOFHOLLOWPLASTICPARTSWITHSEPARATEINTERNALCHANNELSITISUNIQUEBECAUSEITCOMBINESTHEADVANTAGESOFCONVENTIONALINJECTIONMOLDINGANDBLOWMOLDINGWHILEDIFFERINGFROMBOTHGAIMOFFERSACOSTEFFECTIVEMEANSOFPRODUCINGLARGE,SMOOTHSURFACEDANDRIGIDPARTSUSINGLOWERCLAMPINGPRESSUREWITHLITTLEORNOFINISHINGBYINTRODUCINGTHEGASBEFORECOMPLETEFILLING,NUMEROUSPROBLEMSSUCHASWARPAGE,SINKMARKS,ANDHIGHFILLINGPRESSUREAREMOSTLYOVERCOMEMOREOVER,THEPROCESSGIVESGREATBENEFITSINTERMSOFHIGHERSTIFFNESSTOWEIGHTRATIOTHANTHESOLIDPARTSWITHTHESAMEOVERALLDIMENSIONSDUETOTHEELIMINATIONOFMATERIALPLACEDINEFFICIENTLYNEARTHENEUTRALAXISOFTHECROSSSECTION,THUSINCREASINGTHEFREEDOMOFPARTDESIGNINCOMPARISONWITHCONVENTIONALINJECTIONMOLDING,THEGASASSISTEDPROCESSISMORECRITICALINTERMSOFPROCESSCONTROL,ESPECIALLYFORMULTICAVITYAPPLICATIONSTHEQUALITYOFTHEPARTISDETERMINEDBYBOTHTOOLANDPROCESSVARIABLESSUCHASDEGREEOFUNDERFILL,GASINJECTIONCONDITIONS,ANDMOLDTEMPERATURE,THUSINDICATINGTHEIMPORTANCEOFPROCESSCONTROLTHEPROCESSISATTRACTINGMANYMOLDERSDUETOTHEDEMANDFORHIGHLYAUTOMATEDPRODUCTIONOFGASASSISTEDINJECTIONMOLDEDPARTSTHEGASASSISTEDINJECTIONMOLDINGPROCESSISTHEMOSTRAPIDLYGROWINGFIELDWITHCONSIDERABLEWORKGOINGONINTHEFIELDOFCONTROLSANDTHEPROCESSDEVELOPMENTRESEARCHINTERESTISDRAWNTOWARDSTHEDEVELOPMENTOFNEWGASINJECTIONUNITS,THESTUDYOFTHEPROCESSVARIABLE,THEEFFICIENCYOFTHEPRODUCTIONPROCESS,ANDADVANTAGESOFFEREDBYTHENEWPROCESSMANYDIFFERENTCOMPANIESAREOFFERINGGASINJECTIONMOLDINGUNITSWITHTHEVARIOUSOPTIONS,WHICHAREMAINLYPRESSURECONTROLLEDORVOLUMECONTROLLEDPROCESSESINGASINJECTIONMOLDING,THEMOLDISPARTIALLYFILLEDWITHMOLTENTHERMOPLASTIC,ANDANINERTGAS,USUALLYNITROGEN,ISINJECTEDINTOTHEPLASTICGASISINJECTEDINTOTHEMOLTENTHERMOPLASTICMATERIALUSINGEITHEROFTWOPROCEDURESINONEMETHOD,AMEASUREDVOLUMEOFGASISPRESSURIZEDINACONTAINERAVALVEISOPENEDTOALLOWTHEGASTOFLOWINTOTHEPOLYMER,ANDAPISTONISACTIVATEDTOFORCEALLGASFROMTHECONTAINERINTOTHEMOLDASTHEGASEXPANDSINTHEMOLD,ITSPRESSUREDROPSASECONDMETHODHOLDSGASPRESSURE,RATHERTHANGASVOLUME,CONSTANTTHEGASRAPIDLYTRAVELSDOWNTHETHICKESTANDTHEREFORETHEHOTTESTSECTIONOFTHEPART,ADVANCINGTHEMELTFRONTANDFILLINGANDPACKINGTHEMOLDADDITIONALPLASTICVOLUMEMAYBEDISPLACEDBYTHEPRESSURIZEDGASASTHEMATERIALSHRINKSAFTERTHEPLASTICCOOLS,THEGASISALLOWEDTOESCAPE,LEAVINGAMOLDEDPLASTICPARTCONTAININGINTERNALVOIDSTHESTANDARDGAIMPROCESSCANBEDIVIDEDINTOFOURPARTIALSTEPSTHEFIRSTSTEPISASTAGEOFMELTSINJECTIONFIG432ATHECAVITYISPARTIALLYFILLEDWITHADEFINEDAMOUNTOFMELTTHEREQUIREDVOLUMEISEMPIRICALLYDETERMINEDBYPERFORMINGFILLINGSTUDIESINORDERTOAVOIDBLOWINGTHEGASTHROUGHATTHEFLOWFRONTANDTOENSUREANIDEALBLOWHOLEVOLUMETYPICALLYTHEPOLYMERFILLSTHECAVITYBETWEEN7595BEFORETHEMELTANDGASTRANSITIONTHEGASINLETPHASEISTHESECONDSTAGE,WHICHISSHOWNINFIG432BGASMAYBEADDEDATANYPOINTINTIMEEITHERDURINGORSHORTLYAFTERMELTSINJECTIONTHEGASCANENTERONLYIFTHEGASPRESSUREEXCEEDSTHEMELTPRESSUREDINTHEINTERIOROFTHEMOLDEDPART,THEGASEXPELSTHEMELTFROMTHEPLASTICNUCLEUSUNTILTHEREMAINDEROFTHECAVITYISCOMPLETELYFILLEDGASINJECTIONPRESSURESRANGEFROM0530MPA704500PSIATTHEGASHOLDINGPRESSUREPHASE,FIG432CTHEGASCONTINUESTOPUSHTHEPOLYMERMELTINTOTHEEXTREMITIESOFTHECAVITYOFTHEMOLDEDARTICLEACTSASAHOLDINGPRESSURETOCOMPENSATEFORPATHOFLEASTRESISTANCEASITPUSHESTHROUGHTHEPOLYMERTHEFINALSTAGEISAGASRETURNFORRECYCLINGORAGASRELEASETOATMOSPHEREFIG432DAFTERTHEGASHOLDINGPHASE,THEGASPRESSUREINTHEMOLDEDARTICLEISRELEASEDTOTHEOUTSIDEBYSUITABLEGASRETURNAND/ORBYPRESSURERELEASEAADVANTAGESOFTHEGAIMPROCESSGASINJECTIONPROVIDESASOLUTIONTOANUMBEROFPROBLEMSTHATOCCURSINCONVENTIONALINJECTIONMOLDING1REDUCINGSTRESSANDWARPAGEWITHGAS,THEPRESSUREISEQUALEVERYWHERETHROUGHOUTTHECONTINUOUSNETWORKOFHOLLOWCHANNELSWHENDESIGNEDPROPERLY,THESEPROVIDEANINTERNALRUNNERSYSTEMWITHINTHEPART,ENABLINGTHEAPPLIEDPRESSURE,ANDTHEREFORETHEINTERNALSTRESSGRADIENTS,TOBEREDUCEDMARKEDLYTHISREDUCESAPART’STENDENCYTOWARP2ELIMINATIONOFSINKMARKSSINKMARKSRESULTINGFROMRIBSORBOSSESONTHEBACKSIDEOFAPARTHAVELONGBEENAPROBLEMTHESESURFACEMARKSRESULTFROMTHEVOLUMECONTRACTIONOFTHEMELTDURINGCOOLINGSINKMARKSCANBEMINIMIZEDORELIMINATEDIFAHOLLOWGASCHANNELCANBEDIRECTEDBETWEENTHEFRONTSURFACEOFTHEPARTANDTHEBACKSIDEDETAILWITHGASINJECTION,THEBASEOFTHERIBMADESOMEWHATTHICKERTOHELPDIRECTTHEGASCHANNELWITHAGASCHANNELATTHEBASEOFARIB,MATERIALSHRINKSAREAWAYFROMTHEINSIDESURFACEOFTHECHANNELASTHEMOLDEDPARTCOOLSBECAUSETHEMATERIALISTHEHOTTESTATTHECENTERTHEREFORE,NOSINKMARKOCCURSONTHEOUTSIDESURFACEASTHEPARTSHRINKSDURINGCOOLING3SMOOTHSURFACEUNLIKESTRUCTURALFOAM,GASINJECTIONPERMITSLIGHTERWEIGHTANDSAVESMATERIALINASTRUCTURALLYRIGIDPARTWITHGASHOLDING,AGOODSURFACEQUALITYCANBEACHIEVED4REDUCEDCLAMPTONNAGEINCONVENTIONALINJECTION,THEHIGHESTPRESSUREOCCURSDURINGTHEPACKINGPHASETHEMAXIMUMINJECTIONPRESSUREISSIGNIFICANTLYLOWERINGAIMANDACONTROLLEDGASPRESSURETHROUGHANETWORKOFHOLLOWCHANNELSISUSEDTOFILLOUTTHEMOLDTHISMEANSTHATCLAMPTONNAGEREQUIREMENTSCANBEREDUCEDBYASMUCHAS905ELIMINATIONOFEXTERNALRUNNERSONEOFTHEBESTFEATURESOFGASINJECTIONISTHATFLOWRUNNERSCANBEBUILTRIGHTINTOTHEPARTFREQUENTLY,ALLEXTERNALRUNNERSBOTHHOTANDCOLDCANBEELIMINATED,EVENONALARGERANDCOMPLEXPARTTHESEBENEFITSINCLUDETHEREDUCEDTOOLINGCOSTS,THELOWERQUANTITIESOFREGRINDFROMRUNNERS,ANDTHEIMPROVEMENTOFTEMPERATURECONTROLOVERTHEPLASTICMELTOFTENTHEINTERNALRUNNERSCANIMPROVETHEFLOWPATTERNINTHEMOLDANDELIMINATEORCONTROLKNITLINELOCATIONRESULTINGFROMMULTIPLEINJECTIONSFROMMULTIPLEINJECTIONGATESINADDITIONTOSERVINGASFLOWCHANNELS,THERIBSANDTHICKSECTIONSCANPROVIDESTRUCTURALRIGIDITYWHENREQUIRED6PERMITTINGDIFFERENTWALLTHICKNESSACONSTANTWALLTHICKNESSISMAINTAINEDINTHEPLASTICPARTSWITHGASINJECTION,THISDESIGNRULEISFLEXIBLEDIFFERENTWALLTHICKNESSESAREPOSSIBLEIFGASCHANNELSAREDESIGNEDINTOTHEPARTATTHETRANSITIONPOINTSTHISPERMITSUNIFORMMATERIAL

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