塑料注射成型工艺基础[1]

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1、塑料注射成型工艺基础内容提要注射工艺过程注射压力填充模式浇注系统与流道平衡冷却系统应力、收缩与翘曲常见的注塑缺陷CAE软件应用指南Co-injectionmoldingFusiblecoreinjectionmoldingGas-assistedinjectionmoldingInjection-compressionmoldingLamellar(microlayer)injectionmoldingLive-feedinjectionmoldingLow-pressureinjectionmoldingPush-pullinjec

2、tionmoldingStructuralfoaminjectionmoldingProcesscycleImportanceofprocessconditionsResindatatableGenericNameMeltTemperature(C/F)MoldTemperature(C/F)Min.Rec.Max.Min.Rec.Max.ABS200/392230/446280/53625/7750/12280/176PA6230/446255/491300/57270/15885/185110/230PC260/500305/58

3、1340/64470/15895/203120/248PET265/509270/518290/55480/176100/212120/248PMMA240/464250/482280/53635/9060/14080/176POM180/356225/437235/45550/12270/158105/221PP200/392230/446280/53620/6850/12280/176PS180/356230/446280/53620/6850/12270/158PVC160/320190/374220/42820/6840/10

4、470/158SAN200/392230/446270/51840/10460/14080/176Temperature-timecurveatvariouslocationsinthemoldScrewpositionsatvariousstagesCycletimeanditscomponentsRequiredmoldopeningDeterminationofthegate/partfreezingtimePressuredecreasesalongthedeliverysystemandthecavityFactorsinf

5、luencinginjectionpressurerequirements(I)VariableHigherinjectionpressurerequiredLowerinjectionpressurerequiredPARTDESIGNPartthicknessPartsurfaceareaFactorsinfluencinginjectionpressurerequirements(II)VariableHigherinjectionpressurerequiredLowerinjectionpressurerequiredGAT

6、EDESIGNGatesizeFlowlengthFactorsinfluencinginjectionpressurerequirements(III)VariableHigherinjectionpressurerequiredLowerinjectionpressurerequiredPROCESSINGCONDITIONSMelttemperaturePartsurfaceareaRamspeedFactorsinfluencinginjectionpressurerequirements(IV)VariableHigheri

7、njectionpressurerequiredLowerinjectionpressurerequiredMATERIALSELECTIONMeltflowindexInjectionpressureasafunctionMeltfrontadvancementsMelt-frontvelocityandmelt-frontareaFiberorientationsVariationofMFABasicrunnersystemlayoutsCommonlyusedrunnercrosssectionsEquivalenthydrau

8、licdiametersRunnerdiameterchartEffectofrunnerlengthHotrunnersystemtypesFillingpatternsresultingfromvariousinje