高分子材料成型加工基础 第六章 注塑成型

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1、高分子材料成型加工基础—第六章（1）CONTENT高分子材料成型加工基础6.1概述(General)6.2注塑成型设备(InjectionMoldingMachine)(FundamentalsofPolymerMaterialsFormingandProcessing)6.3注塑成型工艺过程(InjectionMoldingProcess)6.4注塑工艺条件分析(TechnologyAnalysis)第六章注塑成型6.5注塑成型现象分析(PhenomenaAnalysis)6.6热固性塑料的传递模塑和注射模塑Chapter6InjectionMold

2、ing(TransferMolding&InjectionMoldingforThermoset)6.7反应注塑成型(RIM)PARTI6.8注塑研究进展(RecentDevelopment)高分子材料成型加工基础—第六章（1）高分子材料成型加工基础—第六章（1）6.1概述(General)本章主要参考书成型过程：将粒料或粉料从注塑机的料斗送进加热的料筒，径加热剪切融化呈1.黄锐等，《塑料成型工艺学》流动状态后，借柱塞或螺杆的推动作用通轻工出版社20052.戴伟民等，《塑料注射成型》过料筒端部的喷嘴注入闭合夹紧的模具，化学工业出版社2005充满模腔的熔

3、料在受压的情况下，经冷却固化后保持模腔赋予的形状，最后拉开模具取出塑料制品。高分子材料成型加工基础—第六章（1）高分子材料成型加工基础—第六章（1）PRINCIPLESOFINJECTIONMOLDING热塑性塑料注射成型过程TheinjectionmoldingofthermoplasticscanbesubdividedintoseveralstagesintheInjectionMoldingProcessingforThermoplasticscaseofthemostcommonreciprocatingscrewmachine.Atthep

4、lasticationstage,thefeedunitoperatesprettymuchasanextruder,meltingandhomogenizingthematerialinthescrew/barrelsystem.Thescrew,however,isallowedtoretract,tomakeroomforthemoltenmaterialinaspaceatthecylinderhead,referredtohereasthematerial"reservoir",betweenthescrewtipandaclosedvalv

5、eoranobstructionofsolidifiedmaterialfromthepreviousshot.Attheinjectionstage,thescrewisusedasaram(piston)fortherapidtransferofthemoltenmaterialfromthereservoirtothecavitybetweenthetwohalvesoftheclosedmold.Sincethemoldiskeptatatemperaturebelowthesolidificationtemperatureofthemater

6、ial,itisessentialtoinjectthemoltenmaterialrapidlytoensurecompletefillingofthecavity.Ahighholdingorpackingpressureisnormallyexerted,topartiallycompensateforthethermalcontraction(shrinkage)ofthematerialuponcooling.Thecoolingofthematerialinthemoldisoftenthelimitingtimefactorininjec

7、tionmolding,becauseofthelowthermalconductivityofpolymers.Afterthecoolingstage,themoldcanbeopenedandthesolidproductremoved(ejectionstage).1高分子材料成型加工基础—第六章（1）高分子材料成型加工基础—第六章（1）注射成型机的基本结构注射成型机的基本结构MainStructureofInjectionMachineMainStructureofInjectionMachineMoldScrewBarrelHopperCl

8、ampingMoldPlateNozzleControlDriving高分子材料成型加工基础—