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外文翻译--玻璃纤维增强复合材料水辅注塑成型的实验研究.doc

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外文翻译--玻璃纤维增强复合材料水辅注塑成型的实验研究.doc

附录附录1ANEXPERIMENTALSTUDYOFTHEWATERASSISTEDINJECTIONMOLDINGOFGLASSFIBERFILLEDPOLYBUTYLENETEREPHTHALATEPBTCOMPOSITESABSTRACTTHEPURPOSEOFTHISREPORTWASTOEXPERIMENTALLYSTUDYTHEWATERASSISTEDINJECTIONMOLDINGPROCESSOFPOLYBUTYLENETEREPHTHALATEPBTCOMPOSITESEXPERIMENTSWERECARRIEDOUTONAN80TONINJECTIONMOLDINGMACHINEEQUIPPEDWITHALABSCALEWATERINJECTIONSYSTEM,WHICHINCLUDEDAWATERPUMP,APRESSUREACCUMULATOR,AWATERINJECTIONPIN,AWATERTANKEQUIPPEDWITHATEMPERATUREREGULATOR,ANDACONTROLCIRCUITTHEMATERIALSINCLUDEDVIRGINPBTANDA15GLASSFIBERFILLEDPBTCOMPOSITE,ANDAPLATECAVITYWITHARIBACROSSCENTERWASUSEDVARIOUSPROCESSINGVARIABLESWEREEXAMINEDINTERMSOFTHEIRINFLUENCEONTHELENGTHOFWATERPENETRATIONINMOLDEDPARTS,ANDMECHANICALPROPERTYTESTSWEREPERFORMEDONTHESEPARTSXRAYDIFFRACTIONXRDWASALSOUSEDTOIDENTIFYTHEMATERIALANDSTRUCTURALPARAMETERSFINALLY,ACOMPARISONWASMADEBETWEENWATERASSISTEDANDGASASSISTEDINJECTIONMOLDEDPARTSITWASFOUNDTHATTHEMELTFILLPRESSURE,MELTTEMPERATURE,ANDSHORTSHOTSIZEWERETHEDOMINANTPARAMETERSAFFECTINGWATERPENETRATIONBEHAVIORMATERIALATTHEMOLDSIDEEXHIBITEDAHIGHERDEGREEOFCRYSTALLINITYTHANTHATATTHEWATERSIDEPARTSMOLDEDBYGASALSOSHOWEDAHIGHERDEGREEOFCRYSTALLINITYTHANTHOSEMOLDEDBYWATERFURTHERMORE,THEGLASSFIBERSNEARTHESURFACEOFMOLDEDPARTSWEREFOUNDTOBEORIENTEDMOSTLYINTHEFLOWDIRECTION,BUTORIENTEDSUBSTANTIALLYMOREPERPENDICULARTOTHEFLOWDIRECTIONWITHINCREASINGDISTANCEFROMTHESKINSURFACEKEYWORDSWATERASSISTEDINJECTIONMOLDING;GLASSFIBERREINFORCEDPOLYBUTYLENETEREPHTHALATEPBTCOMPOSITES;PROCESSINGPARAMETERS;BMECHANICALPROPERTIES;CRYSTALLINITY;APOLYMERMATRIXCOMPOSITES;1INTRODUCTIONWATERASSISTEDINJECTIONMOLDINGTECHNOLOGY1HASPROVEDITSELFABREAKTHROUGHINTHEMANUFACTUREOFPLASTICPARTSDUETOITSLIGHTWEIGHT,FASTERCYCLETIME,ANDRELATIVELYLOWERRESINCOSTPERPARTINTHEWATERASSISTEDINJECTIONMOLDINGPROCESS,THEMOLDCAVITYISPARTIALLYFILLEDWITHTHEPOLYMERMELTFOLLOWEDBYTHEINJECTIONOFWATERINTOTHECOREOFTHEPOLYMERMELTASCHEMATICDIAGRAMOFTHEWATERASSISTEDINJECTIONMOLDINGPROCESSISILLUSTRATEDINFIG1WATERASSISTEDINJECTIONMOLDINGCANPRODUCEPARTSINCORPORATINGBOTHTHICKANDTHINSECTIONSWITHLESSSHRINKAGEANDWARPAGEANDWITHABETTERSURFACEFINISH,BUTWITHASHORTERCYCLETIMETHEWATERASSISTEDINJECTIONMOLDINGPROCESSCANALSOENABLEGREATERFREEDOMOFDESIGN,MATERIALSAVINGS,WEIGHTREDUCTION,ANDCOSTSAVINGSINTERMSOFTOOLINGANDPRESSCAPACITYREQUIREMENTS2–4TYPICALAPPLICATIONSINCLUDERODSANDTUBES,ANDLARGESHEETLIKESTRUCTURALPARTSWITHABUILTINWATERCHANNELNETWORKONTHEOTHERHAND,DESPITETHEADVANTAGESASSOCIATEDWITHTHEPROCESS,THEMOLDINGWINDOWANDPROCESSCONTROLAREMORECRITICALANDDIFFICULTSINCEADDITIONALPROCESSINGPARAMETERSAREINVOLVEDWATERMAYALSOCORRODETHESTEELMOLD,ANDSOMEMATERIALSINCLUDINGTHERMOPLASTICCOMPOSITESAREDIFFICULTTOMOLDSUCCESSFULLYTHEREMOVALOFWATERAFTERMOLDINGISALSOACHALLENGEFORTHISNOVELTECHNOLOGYTABLE1LISTSTHEADVANTAGESANDLIMITATIONSOFWATERASSISTEDINJECTIONMOLDINGTECHNOLOGYFIG1SCHEMATICDIAGRAMOFWATERASSISTEDINJECTIONMOLDINGPROCESSWATERASSISTEDINJECTIONMOLDINGHASADVANTAGESOVERITSBETTERKNOWNCOMPETITORPROCESS,GASASSISTEDINJECTIONMOLDING5,BECAUSEITINCORPORATESASHORTERCYCLETIMETOSUCCESSFULLYMOLDAPARTDUETOTHEHIGHERCOOLINGCAPACITYOFWATERDURINGTHEMOLDINGPROCESSTHEINCOMPRESSIBILITY,LOWCOST,ANDEASEOFRECYCLINGTHEWATERMAKESITANIDEALMEDIUMFORTHEPROCESSSINCEWATERDOESNOTDISSOLVEANDDIFFUSEINTOTHEPOLYMERMELTSDURINGTHEMOLDINGPROCESS,THEINTERNALFOAMINGPHENOMENON6THATUSUALLYOCCURSINGASASSISTEDINJECTIONMOLDEDPARTSCANBEELIMINATEDINADDITION,WATERASSISTEDINJECTIONMOLDINGPROVIDESABETTERCAPABILITYOFMOLDINGLARGERPARTSWITHASMALLRESIDUALWALLTHICKNESSTABLE2LISTSACOMPARISONOFWATERANDGASASSISTEDINJECTIONMOLDINGWITHINCREASINGDEMANDSFORMATERIALSWITHIMPROVEDPERFORMANCE,WHICHMAYBECHARACTERIZEDBYTHECRITERIAOFLOWERWEIGHT,HIGHERSTRENGTH,ANDAFASTERANDCHEAPERPRODUCTIONCYCLETIME,THEENGINEERINGOFPLASTICSISAPROCESSTHATCANNOTBEIGNOREDTHESEPLASTICSINCLUDETHERMOPLASTICANDTHERMOSETPOLYMERSINGENERAL,THERMOPLASTICPOLYMERSHAVEANADVANTAGEOVERTHERMOSETPOLYMERSINPOPULARMATERIALSINSTRUCTURALAPPLICATIONSPOLYBUTYLENETEREPHTHALATEPBTISONEOFTHEMOSTFREQUENTLYUSEDENGINEERINGTHERMOPLASTICMATERIALS,WHICHISFORMEDBYPOLYMERIZING14BUTYLENEGLYCOLANDDMTTOGETHERFIBERREINFORCEDCOMPOSITEMATERIALSHAVEBEENADAPTEDTOIMPROVETHEMECHANICALPROPERTIESOFNEATPLASTICMATERIALSTODAY,SHORTGLASSFIBERREINFORCEDPBTISWIDELYUSEDINELECTRONIC,COMMUNICATIONANDAUTOMOBILEAPPLICATIONSTHEREFORE,THEINVESTIGATIONOFTHEPROCESSINGOFFIBERREINFORCEDPBTISBECOMINGINCREASINGLYIMPORTANT7–10THISREPORTWASMADETOEXPERIMENTALLYSTUDYTHEWATERASSISTEDINJECTIONMOLDINGPROCESSOFPOLYBUTYLENETEREPHTHALATEPBTMATERIALSEXPERIMENTSWERECARRIEDOUTONAN80TONINJECTIONMOLDINGMACHINEEQUIPPEDWITHALABSCALEWATERINJECTIONSYSTEM,WHICHINCLUDEDAWATERPUMP,APRESSUREACCUMULATOR,AWATERINJECTIONPIN,AWATERTANKEQUIPPEDWITHATEMPERATUREREGULATOR,ANDACONTROLCIRCUITTHEMATERIALSINCLUDEDAVIRGINPBTANDA15GLASSFIBERFILLEDPBTCOMPOSITE,ANDAPLATECAVITYWITHARIBACROSSCENTERWASUSEDVARIOUSPROCESSINGVARIABLESWEREEXAMINEDINTERMSOFTHEIRINFLUENCEONTHELENGTHOFWATERPENETRATIONINMOLDEDPARTS,WHICHINCLUDEDMELTTEMPERATURE,MOLDTEMPERATURE,MELTFILLINGSPEED,SHORTSHOTSIZE,WATERPRESSURE,WATERTEMPERATURE,WAT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