一种集成装配过程信息的装配建模方法

Including Assembly Process Information (API) in Product Assembly Model for Better Assembly of Product

装配工装、装配夹具、装配工具和装配操作等装配过程信息的参与对产品装配顺序有直接的影响,为了获得合理的装配顺序,需要在装配模型中描述装配过程信息。文中提出了一种集成装配过程信息的装配建模方法,在分析了装配单元、装配过程信息在产品装配过程中引入和退出装配环境的优先关系基础上,基于有向图和无向图的连接图模型建立了集成装配过程信息的装配模型,并采用邻接矩阵表示法对装配模型进行了表示。该模型有利于装配工艺经验的表达和产品的装配工艺规划。采用实例验证了该方法,并已在某型飞机机翼装配工艺规划中得到了应用。

Assembly process information (API) includes information about assembly fixture, assembly tools, assembly operation, and so on. Up to now, lack of adequate API in assembly model has, in our opinion, brought to the actual assembly many problems such as: fixing difficulty, inadequate space of assembly operation, and bad access to assembly environment for assembly-cells and API. Then assembly planning has to do poorly done work over again. This paper presents an assembly model integrating adequate API. The basic idea of the approach is to express API in assembly model by building prior relationship and constraint relationship between assembly-cells and API. We analyze and define prior relationship between assembly-cells and API when assembly-cells and API come into and come out from assembly environment. Assembly model integrating API is built by connected-graph model based on directed graph and undirected graph. Firstly, the directed graph represents the prior relationship between assembly-cells and API when assembly-cells and API come into and come out from assembly environment. Secondly, the undirected graph represents assembly relationship between assembly-cells and API. Thirdly, a connected-graph model is used to integrate the directed graph and the undirected graph. So an assembly model integrating API appears. Then this model is expressed using adjacency matrix. The assembly model integrating API is propitious to expressing experiences of assembly process and to planning assembly sequence of product. We applied our approach successfully to planning assembly process of a certain aircraft wing, whose assembly went on quit smoothly.