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在产品结构设计的概念设计阶段，具有一定工程意义的图形单元是工程师实现设计思想图形化的工程语言。本文以图形单元作为产品结构建模的基本单位，提出了进行产品结构模型编辑的图形置换技术，给出了实用、方便的单元操作方法，实现了基于功能设计图形结构的过程。
In the conceptual design phase of product structure design, a graphic element with certain engineering significance is an engineering language for an engineer to realize a graphical design idea. In this paper, the graphic unit is taken as the basic unit of product structure modeling, and a graphic replacement technology for product structure model editing is proposed. A practical and convenient unit operation method is given, and the process of designing the graphic structure based on the function is realized.