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1、PrecisioninjectionmoldingtechnologyofprogressAuthor:MasakiMikellChenChunAbstract:Introductionaboutprecisioninjectionmoldingtechnologyofthepolymermaterials,anddiscussionaboutfactorswhichimpacttheprecisioninjectionmolding,includingtheprecisionofthemold,thecontrolaccuracyoftheinjectionmoldingmachine,th
2、eprocesscontrolofprecisioninjectionandothercomputercontroltechnology.Discussedtoeachofthesefactors,andgiventherelevantsolutions,finally,introduceanumberofadvancedmoldingtechnology.Keywords:PrecisionInjection,InjectionMachine,PrecisionInjectionMoldInrecentyears,withtherapiddevelopmentoftheelectronics
3、,telecommunications,healthcare,automotive,andotherindustries,thedemandtohigh-precisionandhighperformanceofplasticproductsisincreasingdaybyday,promptedprecisionmoldingtechnologycontinuestoprogress,newtechnologiescontinuetoemerge.Precisioninjectionmoldingproductsnotonlyrequirehighdimensionalaccuracy,l
4、owwarpage,gdtowrite,butalsorequireexcellentopticalproperties,LInjectionmoldingisthemostimportantmethodoftheplasticmolding,includingplasticsplastics,injection,andpacking,severalbasiccoolingprocess,sotherearemanyfactorswhichcanimpactprecisioninjectionmolding.1 PrecisionMoldTbcreatesophisticatedproduct
5、s,precisionmoldisessential.GenerallytheaccuracyoftheMoldcontrolledbythemoldtemperature,theprecisionmanufacturingmoldandtheselectionofplasticshrinkageratewhenmolddesign.1.1 TheControlPrecisionofTheMoldTemperatureGeneralprecisionpartsintheinjectionmolding,temperaturecontrolofmoldistoincreaseproductivi
6、ty.However,theimpactoftemperaturecontrolofmoldforprecisioninjectionmoldingisgreat，itaffectscomponentofcontraction,shape,crystallization,stressandsoon,thereforemolddesigntemperaturelooptemperaturedistributionattherequestreasonable,controlaccuracyisprecise.Wenpreferredmodecontrolandacool-watermachine.
7、Moldtemperaturecontrolandcoolingtimeonproductperformanceandtheimpactisasfollows,31:(I)MeItplasticinjectionandthecycletimeofmoldcavitycanmakefluctuationsofthetemperaturedifference,thereforebetominimizethevolatilityworsepeaks.(2)Heattransferofmoldisthroughtheconcreteandmolddiewithinthemediaaroundthewo
8、rld.Moldisunchangedandthereforecontrolofthemediaisthekey,thegeneralimportandexportofitscoolingwatertemperatureislessthan1C,applicationofthetheorytotheaveragetemperaturecalculated14,thiscanguaranteethestabilityofheattransfer.(3)Stablestateofmoldtomaintainabalancebetweenabsorptionanddistributionofheat
9、,injectionmoldingmachineshouldstrictlymaintainastabletemperature.1.2 TheDesignAndManufactureofPrecisionMoldThepremisetoguarantprecisioncomponentsizeofplasticismolddesigninordertoimprovetheprecisionofprecisioninjectionmold,usingcomputer-aidedanalysisisnecessaryinthedesignprocess,especiallyonthegating
10、systemandthebehaviorofmoldtemperaturecontrolsystemheatdistributionanalysis.1.3 TheUseofPrecisionMoldDesignShrinkageRatePrecisioninjectionmoldingmachinegenerallyhaslargerinjectionofpower,makedifficultiestomolddesign,sizeandcavitysizeprecisioncontrolproducts.Precisionplasticpartsofthedesignpriortomanu
11、facturesimplemoldtomeasurethemoldingpartoftheactualshrinkage,thiswillgreatlyimprovetheaccuracyofcomponentsize.2 BestPrecision!injectionMoldingProcessParametersSettingsTothebestmoldingprocessparameterstoreduceplasticproducts,theshrinkagerate.Partsofthewallthicknessdifferenceisgenerallyconsideredbythe
12、twofactors:.(1)Melthypertensioncausedbymoldcavityminordeformation;(2)Whenthemoldcavityflexibilityofthematerialafterexpansion.3 PrecisionInjectionMoldingMachineUsedtoReplaceConventionalInjectionMoldingMachinePrecisioninjectionmoldingmachinegenerallylargerinjectionofpower,Besidesmeetinjectionpressurea
13、ndinjectionrateofrequirements,Powerwillbeinjectingitselfontheaccuracyofacertainroleintheimprovement.3.1 TheconsistencyofmoldingcycletimeGeneraltypicalinjectionmoldingmachinewiththreemodes：manual,semi-automaticandfullyautomatic.Duetotheinfluenceofvariousfactors,intheformertwomodelsundereachmoldingcyc
14、letimevary,thiswillaffectthemoldtemperatureandmeltmaterialsintheresidencetime,therebyaffectingtheprecisionofthepartsmade,soinPrecisionmoldingshouldmaximizetheuseoffullyautomaticmodel,41.3.2 TheTemperatureControlofPrecisionInjectionMoldingMachine,AndANewDesignofScrew.Injectionbarrelautomaticthermosta
15、tonthecycleofsexualrelationsandtheopeningofthestovetomeltdensityandviscositychanges.Productsthusaffectingthequalityandaccuracyofthecyclicalfluctuations;injectionmoldingmachinenozzleclosetothemoldcavity.Therefore,thenozzletemperatureofmoldingcomponentwillhaveanimportantimpact.4 PrecisionMoldingTechno
16、logy4.1 ApplicationofTheMoldInjectionCompressionMolding(ICM)TechnologyICMTechnologyisthemeanstoopenacertaindistancefromthemoldundertheconditionsofthebeginninginjection,injectionofacertainamount,closetothebeginningdiecavitymeltimplementationofthecompression,Diecompletelyclosedattheterminationofinjection,andthenpacking,coolinguntiltheremovalproducts.4.2 TheHigh-speedInjectionMoldingHigh-speedinjectionmoldingmethodoffillingmeltsfas
