支持产品变型设计的工程图特征识别技术研究

为有效利用已有的设计资源，提出了从零件工序图重构零件特征模型的方法，实现了工程图特征识别技术的工程应用，讨论了降低元素的搜索空间、减少特征规则数目，几何元素的抽象表示等形状特征识别关键技术，指出了特征参数识别与标注尺寸识别的差异，以牙轮钻头工程图为例说明特征识别的一般过程及方法。

Study on Feature Recognition of Engineering Drawing forVariant Design

In order to make full use of existing design resources,this paper presents a new solution of feature recognition to reconstruct feature model from part's operation drawings. And the feature recognition is put into engineering practice. In this paper, some key technologies about feature recognition are discussed, such as reducing the size of searching space of elements, decreasing the number of the feature rules and symbolizing geometrical elements. And also the difference between recognition of feature parameters and recognition of dimension is given. Finally, an example about drawings of toothed rock-bit is introduced to demonstrate the feature recognition process and method.