辨識深切特徵演算法之研究

Algorithms for Recognizing Undercut Feature

本文提出深切特徵辨識之射線掃描演算法，用於避免脫模時可能產生的干涉問題。首先以一組演算法確認實體幾何模型可視性，再依可視面產生最小輪廓實體與延伸實體，最後對最小輪廓實體、延伸實體與原始實體模型以布林差集運算，可獲得真正的深切特徵與位置。以上演算法是以實體造型技術為基礎。

This paper presents a ray tracing approach for geometric mouldability analysis of manufactured parts during injection process. In order to avoid interference between the mould and the moulding product when the product is ejected from its mould, a set of algorithms using the geometry of the manufactured part to identify the surface visibility. The real undercut features are generated by two stages: main solids creation, in which the solids to be created are composed of minimal contour solid and extensional solids from the manufactured part; and a Boolean operation, in which real undercuts are constructed through an automated Boolean difference operation on the minimal contour solid by subtracting the extensional solids and the original solid model. This method is completely based on solid modelling techniques.