澆口設(shè)計對塑件收縮影響規(guī)律的數(shù)值模擬研究.pdf

1、大連理工大學碩士學位論文澆口設(shè)計對塑件收縮影響規(guī)律的數(shù)值模擬研究姓名：呂長友申請學位級別：碩士專業(yè)：機械電子工程指導教師：于同敏20071201大連理工大學碩士學位論文NumericalSimulationofPlasticPartShrinkageRuleonGateDesignofMouldAbstractPlasticpartsalewidelyusedinindustriessuchaselectronics，communica

2、tions，householdappliances，machinery，automobilesandaerospace，becausetheyhavelightweightandlowpriceaSwellasexcellentintegratedmechanicalpropertiesTheshrinkageinplasticmoldingisacriticalfactorforproducts’qualityandsizepreci

3、sionespeciallyininjectionmoddingItthataffectstheapplicationoftheproductsorcauseeconomiclosesoftellresultsindeformationandoversizeofproductsFrommanufacturingpractices，itdenotesthatthegatedesignofmollldisoneofthemostimport

4、antfactorsthatinfluencetheshrinkageofplasticsTh盯efore，itisallimportantcontentofmoddindustrythattodeterminethereasonablegatepositiongatesize，andthentheshrinkagerulesofplasticsbasedontheplasticconfigurationsBasedontheshrin

5、kagetheoryofinjectionmoldingandexperimentalresults，theeffectsofmaterialcharacteristicsprocessconditiomandmoulds咖chlresontheproductshrinkage舔well嬲theirinterrelationshipalelueubratedinthethesisAsfar器itgoes，therearemanydefi

6、cienciesofshrinkagepredictingmethodsininjectionmoldingandskTinkagecalculatinginmoulddesignInthelightofthesedisadvantagesandplasticmanufactureaswellasmoulddesigntheeffectofgatedesignontheshrinkageofplasticissimulatedbyCAE

7、technologyandMold_flowsoftware啊1emobileshellandtestequipment’Scapalestudiedbychangingcomplexitiesoftheirstructures，differentconfigurationsaleattainedThreedifferentmaterials(Pp，PA66andABS)areinjectedwithchangesincludingdi

8、fferentgatetypes，positions，sizesandnumbersrespectivelyandtheireffectsonshrinkagealeanalyzed耶1eeffectofgatedesignonshrinkageisstudiedbyanalyzingsmleuwalchangeandpl鶴$11refielddistributing11“simulationresultsaredealtbyortho

9、gonalmethod。theinterrelationshipsamongtheserattersmadtheireffectsOnshrinkagerulesalestudiedbyrangeanalysisandcontributionrate11”resultsindicatethatsUacmralcharacteristicsgatepositionandgatenumberhavedistincteffectsonshii

10、nkage，whilegatesizehaslittleeffeaFinallytheshginkagerulesofanactualelectricalshellplasticisstudiedbyexperimentandaforementionedsimulationresultsItshowsthattheyconsistentwitheachotherTheresultsindicatethattheshrinkagerule