基于模流平衡的U型材挤出口模结构优化

Design of U-Shaped Extrusion Die Structure Optimization Based on Die Flow Balance

应用Polyflow软件分别建立了U型件模型、带内外气体辅助层厚度不同的U型件模型和U型件开口有倾角的模型。针对传统挤出、不同内外层辅助气体厚度、不同开口倾角下3种情况进行了数值模拟计算,并用Origin软件对部分结果进行了分析。研究发现,使用气体辅助技术比型腔结构优化更有利于模流平衡;当内外气体辅助层厚度不同时,内层气体层厚度偏大、外层气体层偏薄时,更有利于抑制U型件开口收缩的变形;而对口模开口臂倾斜角度的修正更有利于减小或调整U型件开口收缩的变形。

The U-shaped part model,U-shaped part model with different thickness of the inner and outer gas auxiliary layer,and U-shaped part model with inclined opening angle were built by Polyflow software.Numerical simulation was carried out under three conditions of traditional extrusion,different thickness of auxiliary gas in inner and outer layers,and different inclination of opening.Some results were analyzed by Origin software.It is found that using gas-assisted technology is more beneficial to mold flow balance than cavity structure optimization.And when the thickness of the inner and outer gas assistant layers is different,the inner gas layer is larger and the outer gas layer is thinner,which is more advantageous to restrain the deformation of the U-shaped piece.And it is more advantageous to reduce or adjust the deformation of the opening contraction of the U-shaped part by modifying the inclined angle of the opening arm of the die.