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摘要：
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二维图在投影过程中遗失了大量的空间拓扑信息,图素之间缺乏关联,因此某些基于二维图的设计工作会耗费大量的时间。本文对二维图钣金零件图进行识别,提取其中的特征信息,以辅助完成零件毛坯展开,提高设计效率和自动化程度。首先以二维钣金零件图为基础,研究组成零件的各种钣金特征的形状及其在各个视图中的表示特点。然后在一个视图中进行特征识别,并根据二维图中各个视图的位置关系,将各个视图进行分解,自动提取零件钣金特征在不同视图中的形状。特征提取后,对弯曲特征进行展开,利用特征在不同视图中的形状,获得弯曲特征的展开形状,最后对各个特征的展开形状进行拼合,获得零件的最终展开形状。
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A large amount of topological information is omitted during projection and the elements in 2D drawing are non-associative.This causes much time consuming in some design works based on 2D drawings.In order to improve design efficiency and automation,recognition was applied to 2D drawing of sheet metal part and sheet metal features were extracted to help to get part blank shape.According to the alignments of views in 2D drawing,the shapes of sheet metal features were automatically recognized in one view and extracted by dividing the related views in the drawing.After extraction, bending features could be developed via their representations in different views.The final blank shape of the sheet metal part could be formed by translating and rotating all the developed features to combine them together.
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作者简介：
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参考文献：
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