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摘要：提出一种基于形状拆分的机械零件三维模型检索方法。首先根据零件名称和功能，
将机械零件模型库按传统方式划分为四大类，即轴套类、盘盖类、叉架类和箱体类，三维模型
之间的匹配在同一类模型中进行；随后进行三维模型外轮廓扫描，将整个三维模型拆分成若干
平面体、回转体和曲面体，根据同一型体之间特征数量和参数的不同，进行单一型体之间的匹
配；最后根据单一型体的数量和匹配对的相似度，综合计算整个模型的相似度。单一型体的定
义和整个匹配算法均是围绕着形状和工艺相似进行的。通过实例验证了该方法的有效性。
Abstract: A 3D model retrieval method of mechanical parts based on shape split was proposed.#br# Firstly, according to the name and function of the parts, the mechanical parts model library was#br# divided into four categories with the traditional way: the shaft-like parts, the plate-like parts, the#br# fork-like parts and the box-like parts, the matching between the two 3D models was completed in the#br# same category. Then, scanning the outer contour of 3D models with the computer and dividing one#br# 3D model into several sub-models, such as plane solids, revolved solids or curved solids, the#br# matching between the two sub-models was calculated with the quantity of the features and the values#br# of feature-parameters at the same kind of sub-models. Finally, the similarity degree of the whole#br# model is computed synthetically with the numbers of sub-models and similarity degrees of the#br# matching between the two sub-models. The definition of sub-models and the whole matching#br# algorithm were determined by the similar shapes and process. A case study was used to reveal the#br# effectiveness of this method.
