1、附录附录1Anexperimentalstudyofthewater-assistedinjectionmoldingofglassfiberfilledpoly-butylene-terephthalate(PBT)compositesAbstract：Thepurposeofthisreportwastoexperimentallystudythewater-assistedinjectionmoldingprocessofpoly-butylene-terephthalate(PBT)composites/Experimentswerecarriedoutonan80-toninject
2、ion-moldingmachineequippedwithalabscalewaterinjectionsystem/whichincludedawaterpump/apressureaccumulator/awaterinjectionpin/awatertankequippedwithatemperatureregulator/andacontrolcircuit/ThematerialsincludedvirginPBTanda15%glassfiberfilledPBTcomposite/andaplatecavitywitharibacrosscenterwasused/Vario
3、usprocessingvariableswereexaminedintermsoftheirinfluenceonthelengthofwaterpenetrationinmoldedparts/andmechanicalpropertytestswereperformedontheseparts/X-raydiffraction(XRD)wasalsousedtoidentifythematerialandstructuralparameters/Finally/acomparisonwasmadebetweenwater-assistedandgas-assistedinjectionm
4、oldedparts/Itwasfoundthatthemeltfillpressure/melttemperature/andshortshotsizewerethedominantparametersaffectingwaterpenetrationbehavior/Materialatthemold-sideexhibitedahigherdegreeofcrystallinitythanthatatthewater-side/Partsmoldedbygasalsoshowedahigherdegreeofcrystallinitythanthosemoldedbywater/Furt
5、hermore/theglassfibersnearthesurfaceofmoldedpartswerefoundtobeorientedmostlyintheflowdirection/butorientedsubstantiallymoreperpendiculartotheflowdirectionwithincreasingdistancefromtheskinsurface/Keywords/Waterassistedinjectionmolding；Glassfiberreinforcedpoly-butylene-terephthalate(PBT)composites；Pro
6、cessingparameters；B/Mechanicalproperties；Crystallinity；A/Polymermatrixcomposites；1/IntroductionWater-assistedinjectionmoldingtechnology1hasproveditselfabreakthroughinthemanufactureofplasticpartsduetoitslightweight/fastercycletime/andrelativelylowerresincostperpart/Inthewater-assistedinjectionmolding
7、process/themoldcavityispartiallyfilledwiththepolymermeltfollowedbytheinjectionofwaterintothecoreofthepolymermelt/Aschematicdiagramofthewater-assistedinjectionmoldingprocessisillustratedinFig/1/Water-assistedinjectionmoldingcanproducepartsincorporatingboththickandthinsectionswithlessshrink-ageandwarp
8、ageandwithabettersurfacefinish/butwithashortercycletime/Thewater-assistedinjectionmoldingprocesscanalsoenablegreaterfreedomofdesign/materialsavings/weightreduction/andcostsavingsintermsoftoolingandpresscapacityrequirements24/Typicalapplicationsincluderodsandtubes/andlargesheet-likestructuralpartswit
9、habuilt-inwaterchannelnetwork/Ontheotherhand/despitetheadvantagesassociatedwiththeprocess/themoldingwindowandprocesscontrolaremorecriticalanddifficultsinceadditionalprocessingparametersareinvolved/Watermayalsocorrodethesteelmold/andsomematerialsincludingthermoplasticcompositesaredifficulttomoldsucce
10、ssfully/Theremovalofwateraftermoldingisalsoachallengeforthisnoveltechnology/Table1liststheadvantagesandlimitationsofwater-assistedinjectionmoldingtechnology/Fig/1/Schematicdiagramofwater-assistedinjectionmoldingprocess/Waterassistedinjectionmoldinghasadvantagesoveritsbetterknowncompetitorprocess/gas
11、assistedinjectionmolding5/becauseitincorporatesashortercycletimetosuccessfullymoldapartduetothehighercoolingcapacityofwaterduringthemoldingprocess/Theincompressibility/lowcost/andeaseofrecyclingthewatermakesitanidealmediumfortheprocess/Sincewaterdoesnotdissolveanddiffuseintothepolymermeltsduringthem
12、oldingprocess/theinternalfoamingphenomenon6thatusuallyoccursingas-assistedinjectionmoldedpartscanbeeliminated/Inaddition/waterassistedinjectionmoldingprovidesabettercapabilityofmoldinglargerpartswithasmallresidualwallthickness/Table2listsacomparisonofwaterandgasassistedinjectionmolding/Withincreasin
13、gdemandsformaterialswithimprovedperformance/whichmaybecharacterizedbythecriteriaoflowerweight/higherstrength/andafasterandcheaperproductioncycletime/theengineeringofplasticsisaprocessthatcannotbeignored/Theseplasticsincludethermoplasticandthermosetpolymers/Ingeneral/thermoplasticpolymershaveanadvant
14、ageoverthermosetpolymersinpopularmaterialsinstructuralapplications/Poly-butylene-terephthalate(PBT)isoneofthemostfrequentlyusedengineeringthermoplasticmaterials/whichisformedbypolymerizing1/4butyleneglycolandDMTtogether/Fiber-reinforcedcompositematerialshavebeenadaptedtoimprovethemechanicalpropertie
15、sofneatplasticmaterials/Today/shortglassfiberreinforcedPBTiswidelyusedinelectronic/communicationandautomobileapplications/Therefore/theinvestigationoftheprocessingoffiber-reinforcedPBTisbecomingincreasinglyimportant710/Thisreportwasmadetoexperimentallystudythewaterassistedinjectionmoldingprocessofpo
16、ly-butylene-terephthalate(PBT)materials/Experimentswerecarriedoutonan80-toninjection-moldingmachineequippedwithalabscalewaterinjectionsystem/whichincludedawaterpump/apressureaccumulator/awaterinjectionpin/awatertankequippedwithatemperatureregulator/andacontrolcircuit/ThematerialsincludedavirginPBTan
17、da15%glassfiberfilledPBTcomposite/andaplatecavitywitharibacrosscenterwasused/Variousprocessingvariableswereexaminedintermsoftheirinfluenceonthelengthofwaterpenetrationinmoldedparts/whichincludedmelttemperature/moldtemperature/meltfillingspeed/short-shotsize/waterpressure/watertemperature/waterholdan
18、dwaterinjectiondelaytime/Mechanicalpropertytestswerealsoperformedonthesemoldedparts/andXRDwasusedtoidentifythematerialandstructuralparameters/Finally/acomparisonwasmadebetweenwater-assistedandgas-assistedinjectionmoldedparts/Table1Advantagesanddisadvantagesofwater-assistedinjectionmoldingAdvantagesD
19、isadvantages1/Shortcycletime1/Corrosionofthesteelmoldduetowater2/Lowassistingmediumcost(waterismuchcheaperandcanbeeasilyrecycled)2/Largerorificesfortheinjectionpinrequired(easiertogetstuckbythepolymermelt)3/Nointernalfoamingphenomenoninmoldedparts3/Somematerialsaremoredifficulttomold(especiallyamorp
20、housthermoplastics)4/Removalofwateraftermoldingisrequired2/Experimentalprocedure2/1/MaterialsThematerialsusedincludedavirginPBT(Grade1111FB/Nan-YaPlastic/Taiwan)anda15%glassfiberfilledPBTcomposite(Grade1210G3/Nan-YaPlastic/Taiwan)/Table3liststhecharacteristicsofthecompositematerials/2/2/Waterinjecti
21、onunitAlabscalewaterinjectionunit/whichincludedawaterpump/apressureaccumulator/awaterinjectionpin/awatertankequippedwithatemperatureregulator/andacontrolcircuit/wasusedforallexperiments3/Anorifice-typewaterinjectionpinwithtwoorifices(0/3mmindiameter)onthesideswasusedtomoldtheparts/Duringtheexperimen
22、ts/thecontrolcircuitofthewaterinjectionunitreceivedasignalfromthemoldingmachineandcontrolledthetimeandpressureoftheinjectedwater/Beforeinjectionintothemoldcavity/thewaterwasstoredinatankwithatemperatureregulatorfor30mintosustainanisothermalwatertemperature/2/3/MoldingmachineandmoldsWater-assistedinj
23、ectionmoldingexperimentswereconductedonan80-tonconventionalinjection-moldingmachinewithahighestinjectionrateof109cm3/s/Aplatecavitywithatrapezoidalwaterchannelacrossthecenterwasusedinthisstudy/Fig/2showsthedimensionsofthecavity/Thetemperatureofthemoldwasregulatedbyawater-circulatingmoldtemperatureco
24、ntrolunit/Variousprocessingvariableswereexaminedintermsoftheirinfluenceonthelengthofwaterpenetrationinwaterchannelsofmoldedparts/melttemperature/moldtemperature/meltfillpressure/watertemperatureandpressure/waterinjectiondelaytimeandholdtime/andshortshotsizeofthepolymermelt/Table4liststheseprocessing
25、variablesaswellasthevaluesusedintheexperiments/2/4/GasinjectionunitInordertomakeacomparisonofwaterandgas-assistedinjectionmoldedparts/acommerciallyavailablegasinjectionunit(GasInjectionPPC-1000)wasusedforthegasassistedinjectionmoldingexperiments/DetailsofthegasinjectionunitsetupcanbefoundintheRefs/1
26、115/Theprocessingconditionsusedforgas-assistedinjectionmoldingwerethesameasthatofwater-assistedinjectionmolding(termsinboldinTable4)/withtheexceptionofgastemperaturewhichwassetat25C/2/5/XRDInordertoanalyzethecrystalstructurewithinthewater-assistedinjection-moldedparts/wide-angleX-raydiffraction(XRD)
27、with2DdetectoranalysesintransmissionmodewereperformedwithCuKaradiationat40kVand40mA/Morespecifically/themeasurementswereperformedonthemold-sideandwater-sidelayersofthewater-assistedinjection-moldedparts/withthe2hanglerangingfrom7to40/Thesamplesrequiredfortheseanalysesweretakenfromthecenterportionoft
28、hesemoldedparts/ToobtainthedesiredthicknessfortheXRDsamples/theexcesswasremovedbypolishingtheTable3CharacteristicsoftheglassfiberreinforcedPBTcompositePropertyASTMPBT15%G/F/PBTYieldstrength(kg/cm2)D-6386001000Bendingstress(kg/cm2)D-5709001500Hardness(R-scale)D-785119120Heatdistortiontemperature(C)(1
29、8/6kg/cm2)D-64860200Meltflowindex(MFI)D-123840251238Impactstrength(Kg-cm/cm)D-25655Meltingtemperature(C)DSC224224samplesonarotatingwheelonarotatingwheel/firstwithwetsiliconcarbidepapers/thenwith300-gradesiliconcarbidepaper/followedby600-and1200-gradepaperforabettersurfacesmoothness/2/6/MechanicalpropertiesTensilestrengthandbendingstrengthweremeasuredonatensiletester/Tensile
免责声明：
1. 《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》内容来源于互联网，版权归原著者或相关公司所有。
2. 若《86561825文库网》收录的文本内容侵犯了您的权益或隐私，请立即通知我们删除。