基于Polyflow的塑料异型材挤出模头功能块流道的设计

针对塑料异型材挤出模头中几何形状复杂的功能块流道设计依赖于经验,常常造成模头挤出不稳定的现状,应用Polyflow软件,以挤出模头出口截面上各子区域的平均流速相等的设计准则,对功能块流道的合理设计进行了研究,以2种不同类型的功能块为例,给出了数值设计的方法和步骤,获得的功能块流道结构与适用的挤出模头设计基本一致。

Polyflow-based design of sprue runner in extrusion tooling outlet for extrusion forming the function part of plastic profiles

The design of sprue runner in the extrusion tooling for extrusion forming the complex geometry functional part of plastic profiles was used to depend on exPeriences, in which the instable operation often occurred during the process of extrusion. A study was made on the rating design of the sprue runner by using Polyflow software and based on the design criteria that every subregion of profile in the outlet section of extrusion die has equal average flow velocity. A method and the procedure for the numerical value design was proposed which proved to be applicable for two different kinds of function part.