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ID:34580643
大小:6.37 MB
页数:85页
时间:2019-03-08
《等规聚丙烯微注塑制品可成型性及形态结构的研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、ABSTRACT———————————————————————————————————一Themeltinthemicroinjectionmoldingprocessexhibitdi丘旨entprocessingcharacteristicscomparedwiththeconventionalinjectionmolding,andmoldedbvthemgIltemperature,highpressureandhighshearinthemicro.cavity,w11iCh、vouldresult1nthesizedependenceoftheviscosity,wal
2、lslip,andthee毹Ctofsu嘞cetenslon1ncreaseintheflowchannel.MaterialexperiencedmorecomplicatedmechanicshistoryandthermalhistoryexperiencedcomparedwitIl仃aditional1IlJectionmolding,thesespecialbehaviorwillaffectthecrystallizationofthepolyIneratdifferentstages·Inaddition,thecharacterizationofthemorpho
3、lo西cals臼n】cturealsoexistscertaindifficultiesduetothesizeofmicro.injectionmoldedpartsisv哪small·Therefore,thereisanurgentneedtostudythem唧hologYofthem1Cro。1nJeCtlctonmoldedpartstocontrolthemorphologyofmicroproducts,impmvetheperformanceofmicro-products.ThepaperworkandreleⅥmtconclusions锄.easfollows
4、:l·Analysisofmoldingabilityandflowphenomenaofmicropansinmicro1njectlonmolding·Basedonthemicro—injectionmoldingexperimentsofasetofmlcmthmwallpartswiththicknessof100I.tm,200I.tm,500岬锄dlmm,the1nnuenceoftheprocessparametersonthemoldingabilityofthepanswitIldi疏rerltm1Cknesseswereinvestigated.Theproc
5、essoperationwindowsofthepartswithm蜘tthicknesswereobtained,andthemechanismofflowiInbalancephenomeIla姐dtheVariationoftheshapeofmeltflowfrontinmoldingprocesswereaIlalvzed.The心sultshowedthatthecavityfillingrateincreasedastheinjectionspeed,moldtemperatu托andmelttemperatureincreased,theinfluenceofthe
6、processparameterSonmoldfillingfrombigtosmallinturnwastheinjectionspeed,moldtemperature,melttemperature·Itismoredifficulttoachievethefillingcompletelvwiththedecrea∞ofproductthickness,andtheprocessoperatingwindowwillben町owed.fheprocesswindowanalysisshowedthatthemoldtemperatureandinjectionspeedf1
7、.1-ecloselyrelated.‘2·comp撇tlveanalysisofthetypicalmorphologyofthemicroinjectionparts.ABSTRACTBymeallsofpolarizedlightmicroscopy(FLM)andwideangleX-raydiffractionfWAXD),theinfluenceofinjectionspeed,melttemperatureandmoldt锄p舳onthemorpholo
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