塑料异型材流线型挤出模头形状复杂，模腔表面要求平滑过渡，无滞料，流速要求稳定增加，其结构设计和曲面设计难度大，目前主要依赖于设计者的经验和操作者的熟练程度，设计效率低，无法满足越来越高的整体质量要求。针对以上问题，提出了模具内腔结构曲面的三维建模方法，基于UG和VS平台，应用UG／Open二次开发和MFC技术，实现了多封闭环快速识别，草图曲线一键排序，通过人机交互界面进行曲线匹配和曲面构造，从而搭建了从二维草图到三维建模的CAD集成模块，有效地提高了挤出模流道曲面设计效率和质量，并为后续CAE分析和CAM加工提供有力支撑。%Plastic profile streamlined extrusion die head has a complex shape. For the die cavity surface,smooth transition, no lag material,and stability of the flowing velocity are required. It makes the design of structure and surface is difficult and because of depending on the designer’experience and proficiency of the operator,the design efficiency is low and it can’t meet higher and higher requirement of overall quality. To solve the above problems,the curved die design method of the cavity structure is proposed. Based on the UG and VC platform,UG/Open secondary development and MFC technology were used,fast recognition algorithm of a multi-closed loop and one-click sorting of the sketch curve were realized,and through the human-computer interaction to match curves and construct surface,and CAD integration module from 2 D sketch to 3 D modeling was set up,the efficiency of extrusion die flow surface design is effectively improved,and it provides strong support for CAE analysis and CAM processing.
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