熔体温度对聚合物双腔微管挤出成型的影响  

Influence of melt temperature on polymer double-lumen microtubule extrusion molding

作　　者：邓小珍[1] 陈天荣 纪海波 王自赟 肖兵[1] 刘萍先[1] 刘国亮[2] 钟世开 DENG Xiao-zhen;CHEN Tian-rong;JI Hai-bo;WANG Zi-yun;XIAO Bing;LIU Ping-xian;LIU Guo-liang;ZHONG Shi-kai(Jiangxi Provincial Key Laboratory of Precision Drive and Equipment,Nanchang Institute of Technology,Nanchang 330099,China;School of Mechanical Engineering,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院精密驱动与装备江西省重点实验实,江西南昌330099 [2]南昌工程学院机械工程学院,江西南昌330099

出　　处：《塑性工程学报》2025年第4期124-130,共7页Journal of Plasticity Engineering

基　　金：江西省重点研发计划项目(20243BBI91011);江西省2023年度研究生创新计划项目(YC2023-S999)。

摘　　要：以聚合物双腔微管为研究对象,采用PTT黏弹本构方程和Arrhenius黏度与温度关系方程,建立了双腔微管三维非等温挤出流动数值模型,并运用有限元方法进行了数值求解。通过分析传统和气辅两种不同挤出方式下口模内外熔体速度场、压力场和法向应力场的异同,探究了熔体温度对聚合物双腔微管挤出成型的影响。结果表明:在传统挤出成型中,熔体温度升高对双腔微管的型腔圆度提高及壁厚变厚有积极作用,但对微管外轮廓圆度的影响不明显,其中微管型腔椭圆度从16.3%降至7.14%,而在气辅挤出成型中,微管圆度和壁厚始终保持稳定,不受熔体温度的影响。Taking polymer double-lumen microtubule as research object,the three-dimensional non-isothermal extrusion flow numerical simulation models of polymer double-lumen microtubule were established by using the PTT viscoelastic constitutive equation and the relationship equation between Arrhenius viscosity and temperature.The finite element method was used to carry out the numerical solution.The effect of melt temperature on polymer double-lumen microtubule extrusion molding was explored by analyzing the similarities and differences of the melt velocity field,pressure field and normal stress field under two different extrusion modes of traditional and gas-assisted conditions.The results show that in the traditional extrusion molding,the increase of melt temperature has a positive effect on the improvement of double-lumen microtubule cavity roundness and wall thickness.But its influence on the roundness of the microtubule outer contour is not significant.The ellipticity of microtubule cavity decreases from 16.3%to 7.14%.In gas-assisted extrusion molding,the microtubule roundness and wall thickness remain stable and are not affected by melt temperature.

关 键 词：双腔微管 气辅挤出成型 椭圆度 非等温 数值模拟 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]