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时间:2020-03-26
《微孔塑料连续挤出成型快速降压口模的数值模拟.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、42第41卷,第3期工程塑料应用Vo1.41,NO.32013年3月ENGINEERINGPLASTICSAPPLICATIONMar.2Ol3doi:lO.3969~.issn.1001-3539.2013.03.009微孔塑料连续挤出成型快速降压口模的数值模拟古陈昕,柳和生,黄兴元(南昌大学机电工程学院聚合物成型研究室,南昌330031)摘要:利用Polyflow有限元软件对聚苯乙烯(PS)/CO,均相体系在连续挤出成型圆形快速降压口模中的流动进行数值模拟,考察快速降压口模入12角、长径比及12模温
2、度对Ps微孔塑料熔体沿轴线方向的压力降速率和剪切速率的影响。结果表明,当入12角大于30。时,改变入口角对压力降速率和剪切速率无明显影响,即对微孔塑料的气泡成核影响微小,但当入口角为0。时,与其它各入口角相比,其熔体压力降速率最大,气泡成核时间最早;在毛细管段口模直径不变的情况下,改变其长径比对熔体气泡成核亦无明显影响,但压力降随口模长度缩短而变小;口模温度对剪切速率影响不大,但降低口模温度,压力降速率明显提高,从而有利于微孔塑料的气泡成核。关键词:微孔塑料;连续挤出成型;剪切成核;快速降压口模;数值模
3、拟中图分类号:TQ328.06文献标识码:A文章编号:1001—3539(2013)03.0042—05NumericalSimulationofMicrocellularPlasticinRapidDecompressiveDieofContinuousExtrusionMoldingChenXin,LiuHesheng,HuangXingyuan(PolymerProcessingResearchLab,SchoolofMechanicalandElectricalEngineering,Nanch
4、angUniversity,Nanchang330031,China)Abstract:Numericalsimulationofpolystyrene(PS)/CO2homogeneousphasesystemflowingincircularrapiddecompressivedieofcontinuousextrusionmoldingwasdonethroughfiniteelementanalysissoftwarePolyflow,moreover,effectsofinletanglean
5、daspectratio/D)oftherapiddecompressivedieanddietemperatureonpressuredroprateandsheafingrateofthePSmicrocellularplasticmeltalongthedirectionofaxiswereanalyzed.Theresultsshowthatwhentheinletangleismorethan30。,changinginletanglehasnoobviouseffectonthepressu
6、redroprateandshearingrate,inotherwords,ithaslittleinfluenceonbubblenucleationofmicrocellularplastic,butwhentheinletangleis0。,thepressuredroprateishighestandthebubblenucleationtimeisearliestcomparingwithotherinletangles.ChangingL/DhasalsonOobviousinfluenc
7、eonbubblenucleationofmicrocellularplasticundertheconditionsofdiediameterincapillarysectionbeingconstant,butpressuredropdecreaseswiththedielengthshortening.Theeffectofdietemperatureonshearingrateisslight,butthedietemperaturedecreases,thepressuredropratein
8、creasesobviously,whichisbenefitforbubblenucleationofmicrocellularplastic.Keywords:microcellularplastic;continuousextrusionmolding;shearnucleation;rapiddecompressivedie;numericalsimulation微孔塑料作为一种新型泡沫塑料,由于具有良基本原理是相同的。首先在高压下
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