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Optimal assembly sequence based on design for assembly (DFA) rules

机译：基于组装（DFA）规则设计的最佳装配序列

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When designing a product, care must be taken to ensure that the product can be assembled later on at the manufacturing floor. This paper presents a methodology that takes in a CAD design to check its ease of assembly. The proposed methodology can calculate feasibility scores for an assembly step, then use these scores to calculate the optimal sequence of such assembly steps to construct the end product from its loose parts. Two assembly step scoring rules are presented: local and global assembly feasibility. Local assembly feasibility determines the directions in which two subassemblies can move apart an infinitesimally small distance based on contact faces between the subassemblies. Global assembly feasibility considers whether this small distance can be extended to infinity, by checking the overlap of projections of the pair of subassemblies in locally feasible directions. For both of these rules, problems are reduced to previously calculated scores whenever possible, in order to reduce calculation time. These rules are integrated in an algorithm which generates a complete assembly sequence. This assembly sequence is guaranteed to be the global optimum for the given rules. The algorithm successfully generates an assembly sequence for a small example case; the simplification rules reduced the number of local and global assembly feasibility checks by a factor 10 and 6, respectively.
机译：在设计产品时，必须注意确保产品可以在制造地板上稍后组装。本文介绍了一种方法，采用CAD设计，以检查其易于装配。所提出的方法可以计算组装步骤的可行性分数，然后使用这些分数来计算这种组装步骤的最佳顺序，以将最终产品从其松散的部件构建。提出了两个装配步骤评分规则：本地和全球大会可行性。局部组装可行性确定两个子组件可以基于子组件之间的接触面的无限小距离移动的方向。通过检查本地可行的方向，通过检查该对子组的投影的重叠，全局组装可行性是否可以扩展到无限远。对于这两个规则，尽可能减少先前计算的分数，以减少计算时间。这些规则以算法集成在生成完整的装配序列的算法中。这种装配序列是对给定规则的全局最优的。该算法成功生成了小示例性情况的装配序列;简化规则将分别减少了本地和全局组装可行性检查的数量10和6。

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