资源描述：
《pet片材挤出成型有限元模拟工艺研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、山东科技大学硕士学位论文摘要ABSTRACTPEThaslargeoutput,lowprices,heatresistance,chemicalresistance,abrasionresistance,electricalinsulationandotheradvantages.Ithasawideapplicationspaceinindustrialproduction,andthereforeithascausedtheextensiveconcerntoresearchonPETprocessingtec
2、hnologyandmoldingprocess.Inthispaper,basedonplasticextrusiontheory,polymermeltflowinsheetdiewassystematicallysimulatedthroughcombiningpolymerrheology,computationalfluiddynamicsandplasticprocessing.Polymermeltflowlawsinrectangularsheetextrusiondieandcoat-hangers
3、heetdieweresimulatedandanalyzedbyPOLYFLOWsoftware.Thedistributionofpressurefield,velocityfieldandtemperaturefieldwereobtained.Thesimulationandanalysisofpolymercoextrusionwasperformedandthechangingpositionofthecoextrusionsheetfreeboundarywasobtained.Forrectangul
4、arsheetextrusiondie,extrusionswellwassimulatedanddieoptimizationwasperformed.Meanwhile,factorsaffectingthedesignofextrusiondie-velocityexportuniformityandinletvolumetricflowratewerediscussedthoroughly.TheinfluenceoftheCrossindexandinletvolumetricflowrateonthedi
5、stributionofpolymermeltpressureandvelocitywasanalyzedinthesimulation.Forthecoat-hangerdiesusedwidely,theinfluenceofmanifoldexpansionangle,theentrancelengthandfan-shapedtransitionzonelengthonthedistributionofpolymermeltspressure,velocityandtemperatureareresearch
6、ed.Theinfluenceofinletvolumetricflowrateandthedieflowchannelconvergenceangleonthefreeboundarywereresearchedinthepolymercoextrusionsimulation.Thecorrespondinglawswhichcanguidethemoldingprocessandmolddesignwereobtainedbysimulationtechnology.Theextrusionswellpheno
7、menonofPETsheetisobvious.Whendesigningmold,itshouldbefullytakenpolymerextrusionswelleffectsintoaccount.Thisproblemcanbesolvedbythereverseextrusionfunction.WiththeincreaseoftheCrossindexandtheinletvolumetricflowrate，themeltpressureandvelocityincrease.Theinfluenc
8、eofmanifoldexpansionangleonthemeltspressureandvelocityissignificant,buttheinfluence山东科技大学硕士学位论文摘要onthemeltstemperaturedistributionisnotobvious.Themeltsphysicalfielddistribut
