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摘要：主流CAD 软件在由三维模型生成二维工程图时，因没有充分考虑布局等因素，
自带的零部件序号自动标注功能无法实现智能有序布局，导致标注结果不符合相关标准。针
对该情况，在研究工程图零部件序号标注特点基础上，建立待标注零部件序号子集的数学模
型，并利用算法实现子集的规划、均匀排列等功能，进而实现零部件序号标注的智能布局。
经过在CATIA 平台上的验证，该方法具有较强的自适应性与稳定性，零部件序号的智能标注
功能良好。
Abstract: The main CAD software in generating 2D engineering drawing from 3D model did not#br# fully consider the layout and other factors, and the function of automatic annotation the numbers of#br# parts could not be intelligent and well-organizd. As a results, the annotation of parts did not meet the#br# standards. In view of this situation, the mathematic model of parts number subset is established, and#br# the subset partition, homogeneous alignment and other functions are achieved by using of an#br# algorithm based on the characteristic of engineering drawing of labeling parts number. The parts#br# number intelligent layout is realized. Based on the experiments in the platform of CATIA, the method#br# has stronger adaptability and stability, and the intelligent annotation of parts number run well.
