【摘要】 以聚合物挤出过程有限元模型为基础,采用自主开发的有限元分析软件对幂律型流体在钢塑共挤模具分流段的流动过程进行了非等温模拟,获得了聚合物熔体在模具分流段内的速度场和温度场分布;分析了导入角变化对聚合物熔体流动行为影响的一般规律。结果表明:仅考虑导入角变化对流动行为的影响时,速度场和温度场的分布趋势基本不变;在垂直于流动方向的截面上的速度分布和在流动区域内的最大温升会略有改变。给出的如何合理选择导入角度的建议,对模具设计与优化具有一定的指导意义。更多还原

【Abstract】 Based on the finite element model of the polymer extrusion,Co-extrusion process of polymer with metal insert was analysed by non-isothermal simulation of power-law fluid. The distribution of the velocity and temperature field of polymer in die cavity was obtained.The Influence of flow direction in inlet on the polymer flow in dies cavity was analyzed. The velocity and temperature distribution is unchanged on the whole, and the maximum velocity in outlet and maximum temperature in dies cavity change a little. The suggestion to decide flow direction in inlet gives theoretical guide for the process and mould design of the co-extrusion of polymer with metal insert.更多还原