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外文翻译--注塑模.doc

英文原文THEINJECTIONMOLDING1THEINJECTIONMOLDINGINJECTIONMOLDINGISPRINCIPALLYUSEDFORTHEPRODUCTIONOFTHETHERMOPLASTICPARTS,ALTHOUGHSOMEPROGRESSHASBEENMADEINDEVELOPINGAMETHODFORINJECTIONMOLDINGSOMETHERMOSETTINGMATERIALSTHEPROBLEMOFINJECTIONAMETHODPLASTICINTOAMOLDCAVITYFROMARESERVOIRINJECTIONMOLDINGISQUITESIMILARTOTHATOFDIECASTINGTHEPROCESSCONSISTSOFFEEDINGAPLASTICCOMPOUNDINPOWEREDORGRANULARFORMFROMAHOPPERTHROUGHMETERINGANDMELTINGSTAGESANDTHENINJECTIONITINTOAMOLDAFTERABRIEFCOOLINGPERIOD,THEMOLDISOPENEDANDTHESOLIDIFIEDPARTEJECTEDINJECTIONMOLDINGMACHINEOPERATIONTHEADVANTAGEOFINJECTIONMOLDINGAREIAHIGHMOLDINGSPEEDADAPTERFORMASSPRODUCTIONISPOSSIBLE;IITHEREISAWIDECHOICEOFTHERMOPLASTICMATERIALSPROVIDINGAVARIETYOFUSEFULPROPERTIES;IIIITISPOSSIBLETOMOLDTHREADS,UNDERCUTS,SIDEHOLES,ANDLARGETHINSECTION2THEINJECTIONMOLDINGMACHINESEVERALMETHODSAREUSEDTOFORCEORINJECTIONTHEMELTEDPLASTICINTOTHEMOLDTHEMOSTCOMMONLYUSEDSYSTEMINTHEINLINERECIPROCATINGSCREW,ASSHOWNINFIGURE21THESCREWACTSASACOMBINATIONINJECTIONANDPLASTICIZINGUNITASTHEPLASTICISFEDTOROTATINGSCREW,ITPASSESTHROUGHTHREEZONESASSHOWNFEED,COMPRESSION,ANDMETERINGAFTERTHEFEEDZONE,THESCREWFLIGHTDEPTHISGRADUALLYREDUCEDFORCETHEPLASTICTOCOMPRESSTHEWORKISCONVERTEDTOHEATBYCONDUCTIONFROMTHEBARRELSURFACEASTHECHAMBERINFRONTOFTHESCREWBECOMESFILLED,ITFORCESTHESCREWBACK,TRIPPINGALIMITSWITCHTHATACTIVATESAHYDRAULICCYLINDERTHATFORCESTHESCREWFORWARDANDINJECTSTHEFLUIDPLASTICINTOTHECLOSEDMOLDANANTIFLOWBACKVAVLEPRESENTSPLASTICUNDERPRESSUREFROMESCAPINGBACKINTOTHESCREWFLIGHTTHECLAMPINGFORCETHATAMACHINEISCAPABLEOFEXERTINGISPARTOFTHESIZEDESIGNATIONANDISMEASUREDINTONSARULEOFTHUMBCANBEUSEDTODETERMINETHETONNAGEREQUIREDFORAPARTICULARJOBITISBASEDONTWOTONSOFCLAMPFORCEPERSQUAREINCHOFPROJECTEDAREAIFTHEFLOWPATTERNISDIFFICULTANDTHEPARTSARETHIN,THISMAYHAVETOGOTOTHREEORFOURTONSMANYRECIPROCATINGSCREWMACHINESARECAPABLEOFHANDINGTHERMOSETTINGPLASTICMATERIALSPREVIOUSLYTHESEMATERIALSWEREHANDLEDBYCOMPRESSIONGORTRANSFERMOLDINGTHERMOSETTINGMATERIALSCUREORPOLYMERIZEINTHEMOLDANDAREEJECTEDHOTINTHERANGEOF375℃410℃THERMOSETTINGPARTSMUSTBEALLOWEDTOCOOLINTHEMOLDINORDERORREMOVETHEMWITHOUTDISTORTIONTHUSTHERMOSETTINGCYCLESCANBEFASTEROFCOURSETHEMOLDMUSTBEHEATEDRATHERTHANCHILLED,ASWITHTHERMOPLASTICS3BASICUNDERFEEDMOULDTHEDESCRIPTIONOFTHEDESIGNANDTHEOPENINGSEQUENCEFOLLOWSTHEMOULDCONSISTSOFTHREEBASICPARTS,NAMELYTHEMOVINGHALF,THEFLOATINGCAVITYPLATEANDTHEFEEDPLATERESPECTIVELYTHEMOVINGHALFCONSISTSOFTHEMOVINGMOULDPLATEASSEMBLY,SUPPORTBLOCK,BACKINGPLATE,EJECTORASSEMBLYANDTHEPINEJECTIONGSYSTEMTHUSTHEMOVINGHALFINTHISDESIGNISIDENTICALWITHTHEMOVINGHALFOFBASICMOULDSTHEFLOATINGCAVITYPLATE,WHICHMAYBETHEINTEGERORINSERTBOLSTERDESIGN,ISLOCATEDONSUBSTANTIALGUIDEPILLARSNOTSHOWNFITTEDINTHEFEEDPLATETHESEGUIDEPILLARSMUSTBEOFSUFFICIENTLENGTHTOSUPPORTTHEFLOATINGCAVITYPLATEOVERITSFULLMOVEMENTANDSTILLPROJECTTOPERFORMTHEFUNCTIONOFALIGNMENTBETWEENTHECAVITYANDCOREWHENTHEMOULDISBEINGCLOSEDGUIDEBUSHESAREFITTEDINTOTHEMOVINGMOULDPLATEANDTHEFLOATINGCAVITYPLATERESPECTIVELYTHEMAXIMUMMOVEMENTOFTHEFLOATINGCAVITYPLATEISCONTROLLEDBYSTOPORSIMILARDEVICETHEMOVINGMOULDPLATEISSUITABLYBOREDTOPROVIDESUFFICIENTACLEARANCEFORTHESTOPBOLTASSEMBLYTHESTOPBOLTSMUSTBELONGENOUGHTOPROVIDESUFFICIENTSPACEBETWEENTHEFEEDPLATEANDTHEFLOATINGCAVITYPLATEFOREASYREMOVALOFTHEFEEDSYSTEMTHEMINIMUMSPACEPROVIDEFORSHOULDBE65MMJUSTSUFFICIENTFORANOPERATORTOREMOVETHEFEEDSYSTEMBYHANDIFNECESSARYTHEDESIREOPERATINGSEQUENCEISFORTHEFIRSTDAYLIGHTTOOCCURBETWEENTHEFLOATINGCAVITYPLATETHISENSURESTHESPRUEISPULLEDFROMTHESPRUEBUSHIMMEDIATELYTHEMOULDISOPENEDTOACHIEVETHISSEQUENCE,SPRINGSMAYBEINCORPORATEDBETWEENTHEFEEDPLATEANDTHEFLOATINGCAVITYPLATETHESPRINGSSHOULDBEENOUGHTOGIVEANINITIALIMPETUSTOTHEFLOATINGCAVITYPLATETOENSUREITMOVESAWAYWITHTHEMOVINGHALFITISNORMALPRACTICETOMOUNTTHESPRINGSONTHEGUIDEPILLARSANDACCOMMODATETHEMINSUITABLEPOCKETINTHECAVITYPLATETHEMAJORPARTOFTHEFEEDSYSTEMRUNNERANDSPRUEISACCMMODATEDINTHEFEEDPLATETOFACILITATEAUTOMATICOPERATION,THERUNNERSHOULDBEOFATRAPEZOIDALFORMSOTHATONCEITISPULLEDFROMTHEFEEDPLATEISCANEASILYBEEXTRACTEDNOTETHATIFAROUNDRUNNERISUSED,HALFTHERUNNERISFORMEDINTHEFLOATINGCAVITYPLATE,WHEREITWOULDREMAIN,ANDBEPREVENTEDFROMFALLINGORBEINGWIPEDCLEARWHENTHEMOULDISOPENEDNOWTHATWEHAVECONSIDEREDTHEMOULDASSEMBLYINTHESOMEDETAIL,WELOOKATTHECYCLEOFOPERATIONFORTHISTYPEOFMOULDTHEIMPRESSIONSAREFILLEDVIATHEFEEDSYSTEMANDAFTERASUITABLEDWELLPERIOD,THEMACHINEPLATENSCOMMENCETOOPENAFORCEISIMMEDIATELYEXERTEDBYTHECOMPRESSIONSPRINGS,WHICHCAUSETHEFLOATINGCAVITYPLATETOMOVEAWAYWITHTHEMOVINGHALFASPREVIOUSLYDISCUSSEDTHESPRUEISPULLEDFROMTHESPRUEBUSHBYTHESPRUEPULLERAFTERTHEFLOATINGCAVITYPLATEHASMOVEDAPREDETERMINEDDISTANCE,ITISARRESTEDBYTHESTOPBOLTSTHEMOVINGHALFCONTINUEDTOMOVEBACKANDTHEMOLDINGS,HAVINGSHRUNKONTOTHECORES,AREWITHDRAWNFROMTHECAVITITIESTHEPINGATEBREAKSATITSJUNCTIONWITHTHERUNNERTHESPRUEPULLER,BEINGATTACHEDTOTHEMOVINGHALF,ISPULLEDTHROUGHTHEFLOATINGCAVITYPLATEANDTHEREBYRELEASETHEFEEDSYSTEMWHICHTHENFREETOFALLBETWEENTHEFLOATINGCAVITYPLATEANDTHEMOLDINGSAREEJECTEDWHENTHEMOULDISCLOSED,THERESPECTIVEPLATESARERETURNEDTOTHEIRMOLDINGPOSITIONANDTHECYCLEISREPEATED4FEEDSYSTEMITISNECESSARYTOPROVIDEAFLOWWAYINTHEINJECTIONMOULDTOCONNECTTHENOZZLEOFTHEINJECTIONMACHINETOEACHIMPRESSIONTHISFLOWWAYISTERMEDTHEFEEDSYSTEMNORMALLYTHEFEEDSYSTEMCOMPRISESASPRUE,RUNNERANDGATETHESETERMSAPPLYEQUALLYTOTHEFLOWWAYITSELF,ANDTOTHEMOLDEDMATERIALWHICHISREMOVEFROMTHEFLOWWAYITSELFINTHEPROCESSOFEXTRACTEDMOLDINGATYPICALFEEDSYSTEMFORAFOURIMPRESSION,TWOPLATETYPEMOULDITISSEENTHATTHEMATERIALPASSESTHROUGHTHESPRUE,MAINRUNNER,BRANCHRUNNERANDGATEBEFOREENTERINGTHEIMPRESSIONASTHETEMPERATUREOFMOLTENPLASTICISLOWEREDWHICHGOINGTHROUGHTHESPRUEANDRUNNER,THEVISCOSITYWILLRISE;HOWEVER,THEVISCOSITYISLOWEREDBYSHEARGENERATEDWHENGOINGTHROUGHTHEGATETOFILLTHECAVITYTIISDESIRABLETOKEEPTHEDISTANCETHATTHEMATERIALHASTOTRAVELDOWNTOAMINIMUMTOREDUCEPRESSUREANDHEATLOSSESITISFORTHEREASONTHATCAREFULCONSIDERATIONMUSTBEGIVENTOTHEIMPRESSIONLAYOUTGATE’SDESIGN41SPRUEASPRUEISACHANNELTHROUGHWHICHTOTRANSFERMOLTENPLASTICINJECTEDFROMTHENOZZLEOFTHEINJECTORINTOTHEMOLDITISAPARTOFSPRUEBUSH,WHICHISASEPARATEPARTFROMTHEMOLD42RUNNERARUNNERISACHANNELTHATGUIDESMOLTENPLASTICINTOTHECAVITYOFAMOLD43GATEAGATEISANENTRANCETHROUGHWHICHMOLTENPLASTICENTERSTHECAVITYTHEGATEHASTHEFOLLOWINGFUNCTIONRESTRICTSTHEFLOWANDTHEDIRECTIONOFMOLTENPLASTIC;SIMPLIFIESCUTTINGOFARUNNERANDMOLDINGSTOSIMPLIFYFINISHINGOFPARTS;QUICKLYCOOLSANDSOLIDIFIESTOAVOIDBACKFLOWAFTERMOLTENPLASTICHASFILLEDUPINTHECAVITY44COLDSLUGWELLTHEPURPOSEOFTHECOLDSLUGWELL,SHOWNOPPOSITETHESPRUE,ISTHEORETICALLYTORECEIVETHEMATERIALTHATHASCHILLEDATTHEFRONTOFNOZZLEDURINGTHECOOLINGANDEJECTIONPHASEPERHAPSOFGREATERIMPORTANCEISTHEFACTTHATITPROVIDESPOSITIONMEANSWHEREBYTHESPRUEBUSHFOREJECTIONPURPOSESTHESPRUE,THERUNNERANDTHEGATEWILLBEDISCARDEDAFTERAPARTISCOMPLETEHOWEVER,THERUNNERANDTHEGATEAREIMPORTANTITEMSTHATAFFECTTHEQUALITYORTHECOSTOFPARTS5EJECTIONAMOLDINGISFORMEDINMOULDBYINJECTINGAPLASTICMELT,UNDERPRESSURE,INTOANIMPRESSIONVIAAFEEDSYSTEMITMUSTTHEREFOREBEREMOVEDMANUALLYFURTHERMORE,ALLTHERMOPLASTICMATERIALSCONTRACTASTHEYSOLIDIFY,WHICHMEANSTHATTHEMOLDINGWILLSHRINKONTOTHECOREWHICHFORMSITTHISSHRINKAGEMAKESTHEMOLDINGDIFFICULTTOREMOVEFACILITIESAREPROVIDEDONTHEINJECTIONMACHINEFORAUTOMATICACTUATIONOFANEJECTORSYSTEM,ANDTHISISSITUATEDBEHINDTHEMOVINGPLATENBECAUSEOFTHISTHEMOULD’SEJECTORSYSTEMWILLBEMOSTEFFECTIVELYOPERATEDIFPLACEDINTHEMORNINGHALFOFTHEMOULD,IETHEHALFATTACHEDTOTHEMOVINGPLATENWEHAVESTATEDPREVIOUSLYTHATWENEEDTOEJECTTHE,MOLDING,FROMTHESCOREANDITTHEREFOREFOLLOWSTHATTHECORE,TOO,WILLMOSTSATISFACTORILYBELOCATEDINTHEMOVINGHALFTHEEJECTORSYSTEMINAMOULDWILLBEDISCUSSEDUNDERTHREEHEADINGS,NAMELYITHEEJECTORGIRD;IITHEEJECTORPLATEASSEMBLY;ANDIIITHEMETHODOFEJECTION51EJECTORGIRDTHEEJECTORGIRDISTHATPARTOFTHEMOULDWHICHSUPPORTSTHEMOULDPLATEANDPROVIDESASPACEINTOWHICHTHEEJECTORPLATEASSEMBLYCANBEFITTEDANDOPERATEDTHEGIRDNORMALLYCONSISTSOFABACKPLATEONTOWHICHISMOUNTEDANUMBEROFCONVENIENTLYSHAPED“SUPPORTBLOCKS”THEEJECTORPLATEASSEMBLYISTHATPARTOFTHEMOULDTOWHICHTHEEJECTORELEMENTISATTACHEDTHEASSEMBLYCONSISTSOFANEJECTORPLATE,ARETAININGPLATEANDANEJECTORRODONEENDOFTHISLETTERMEMBERISTHREADEDANDITISSCREWEDINTOTHEEJECTORPLATEINTHISPARTICULARDESIGNTHEEJECTORRODFUNCTIONNOTONLYASANACTUAINGMEMBERBUTALSOASAMETHODGUIDINGTHEASSEMBLYNOTETHATTHEPARALLELPORTIONOFTHEEJECTORRODPASSESTHROUGHANEJECTORRODBUSHFITTEDINTHEBACKPLATEOFTHEMOULD52EJECTIONTECHNIQUESWHENAMOLDINGCOOLS,ITCONTACTSBYANAMOUNTDEPENDINGONTHEMATERIALBEINGPROCESSEDFORAMOLDINGWHICHHASNOINTERNALFORM,FOREXAMPLE,ASOLIDRECTANGULARBLOCK,THEMOLDINGWILLSHRINKAWAYFROMTHECAVITYWALLS,THEREBYPERMITTINGASIMPLEEJECTIONTECHNIQUETOBEADOPTEDHOWEVER,WHENTHEMOLDINGHASINTERNALFORM,THEMOLDING,ASITCOOLS,WILLSHRINKONTOTHECOREANDSOMEPOSITIVETYPEOFEJECTIONANDSOMEPOSITIVETYPEOFEJECTIONISNECESSARYTHEDESIGNERHASSEVERALEJECTIONTECHNIQUESFORMWHICHTOCHOOSE,BUTINGENERAL,THECHOICEWILLBERESTRICTEDDEPENDINGUPONTHESHAPEOFTHEMOLDINGTHEBASICEJECTIONTECHNIQUESAREASFOLLOWSIPINEJECTIONIISLEEVEEJECTIONIIISTRIPPERPLATEEJECTIONANDIVAIREJECTION

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