注塑模具设计中最佳分型方向的确定

注塑模具设计中最佳分型方向的确定(中文3500字,英文2800字)
摘要
在计算机辅助注塑模具设计中，切边特征的自动识别和提取是一个瓶颈。咬边的数量及其位置影响着分型方向和表面、侧抽芯机构、滑块和升降机的设计。以及模具的整体结构。本文提出了一种基于其几何特征和运动部件拓扑关系的识别和提取方法开发的软件。可以根据模制零件的三维模型自动分类和识别。为了清晰地定义切边准则，提出了一种新的分类方法。由于大多数注塑件由曲面和自由曲面组成。介绍了这些表面的识别和提取。在提取了所有的欠压后，根据所提出的考虑可能的欠切数和相应的底切量的准则，选择最优的分型方向。从几个工业部件的案例研究中发现，开发的方法能够有效地确定注塑件的最佳分离方向。
关键词：注射成型、CAD。


Determination of Optimal Parting Directions in Plastic Injiection Mold Design
Abstract
Automatic recognition and extraction of undercut features is a bottleneck in computer-aided injection mold design. The number of undercuts and their locations affect the parting directions and surfaces. side- core mechanism, sliders and lifters design. and the overall structure of a mold. In this paper, a methodology is proposed for the recognition and extraction of undercuts based on their geometricai characteristics and topological relationships of the molded parts. With the developed software. undercuts can be classified and recognized automatically from a 3-0 model of a molded part. In order to define the undercut criteria clearly, a new classification method is presented. Since most of the injection molded parts consist of curved surfaces and free-formed surfaces, recognition and extraction of these surfaces are also introduced. After all the undercuts are extracted, the optimal parting direction is chosen based on the proposed criterion of considering the number of possible undercuts and their corresponding undercut volumes. From the case studies on several industrial parts, the methodology developed is found to be efficient in determining the optimal parting direction of injection molded parts.
Keywords: Injection; Molding; CAD