圆环和锥形口模挤出吹塑的数值研究  

The Numerical Study on Annular Die and Tapered Die in Extrusion Blow Molding

作　　者：李静[1] 彭炯[1] 刘沙粒[1] 于涛 张丁 

机构地区：[1]北京理工大学化工与环境学院,北京100081 [2]燕山石化树脂研究所,北京102400

出　　处：《工程塑料应用》2012年第12期46-49,共4页Engineering Plastics Application

摘　　要：用Polyflow软件的Carreau本构模型,数值模拟了用于管材挤出吹塑和型坯成型的圆环口模和锥形口模内熔体及其型坯的三维等温流场,考虑了挤出胀大和垂伸效应的综合影响,分析了两种口模的差异。数值计算结果表明,对于同一直径和口模间隙的环形口模和锥形口模,在相同入口流量下,环形口模内熔体的压力梯度大于锥形口模,环形口模成型型坯的厚度小于锥形口模,环形口模成型型坯的直径大于锥形口模;环形和锥形口模内熔体的压力梯度随着入口流量的增加而增加,在环形和锥形口模成型型坯的底端,型坯的厚度和外半径随着入口流量的增加而增加;锥形口模成型型坯厚度较环形口模对流量更敏感。The commercial software Polyflow was used to provide numerical results for three-dimensional isothermal flow field of melt and it＇ s parison in annular die and tapered die used in pipe extrusion blow molding and parison formation based on Carreau constitutive model. The difference of annular die and tapered die was also analyzed by considering the comprehensive effect of parison swell and sag in extrusion. The results showed that at the same entrance flow rate, with the same diameter and die gap, the pressure gradient of melt in the annular die was larger than that of the tapered die, the thickness of the parison formed by the annular die was smaller than that formed by the tapered die, the diameter of parison formed by the annular die was larger than that formed by the tapered die. The pressure gradient in the annular die and the tapered die increased with increase of the entrance flow rate. At the bottom of the parison formed by the annular die and the tapered die, the thickness and the outer radius increased with increase of the entrance flow rate. The thickness of the parison formed by tapered die was more sensitive to the entrance flow rate than that formed by the annular die.

关 键 词：挤出胀大 垂伸效应 环形口模 锥形口模 数值模拟 

分 类 号：TQ320.5[化学工程—合成树脂塑料工业]