微孔薄膜挤出成型数值模拟

摘要

UG software was used to design the geometric structure of eight-hole microcapillary film die. And the finite element method was used to simulate the forming section of extrusion die and extrudate parts. Parameter gradual change algorithm was used to investigate the relationship between different tensile stress and the shape or the cross section of extrudate. It showed that with increasing tensile stress, the dimensions of microcapillary film cross section became smaller. The eight air holes were deformed, from the circular to and then diamond, the oval. Because each part had different melt volume content, extrusion surfaces had obvious characteristics of stripe.%利用Unigraphics NX（简称UG）软件设计了8孔微孔薄膜挤出模，并对挤出模成型段及挤出物部分进行了CAE模拟，利用参数渐变法研究了不同拉伸应力下挤出物外形及横截面形状尺寸的变化。结果表明，随着拉伸应力的增大，挤出物横截面尺寸越来越小；气孔由圆形变为菱形、椭圆形；挤出物表面具有明显的波纹特征。