Abstract: To solve the problems of low assembly efficiency and poor consistency of assembly quality caused by disconnection between virtual simulation analysis and physical assembly in assembly process of high precision products,an intelligent assembly method of high precision product driven by digital twin was proposed.The digital twins of high-precision products including all assembly elements were constructed.Aiming at the problems of poor readability of assembly process documents and weak knowledge correlation,an assembly process expression method based on knowledge map was proposed.At the same time,the dynamic adjustment of assembly process was realized by using the inferential property of knowledge map.Aiming at the problem of product quality control,a three-layer structure quality control strategy of operation-state-quality was proposed.Taking the assembly of a certain type of automobile engine block unit as an example,the practicability of the proposed method was verified.

Key words: digital twin, knowledge graph, assembly process, quality control, high precision products

摘要： 为解决高精密产品装配过程中虚拟仿真分析与物理装配脱节导致的装配效率较低、装配质量一致性较差的问题,提出一种数字孪生驱动的高精密产品智能化装配方法。构建了包括装配全要素的高精密产品数字孪生体;针对当前装配工艺文档可读性差、知识关联关系弱等问题,提出一种基于知识图谱的装配工艺表达方式,并利用知识图谱的可推理性对装配工艺进行动态调整;针对产品质量控制问题,提出一种操作—状态—质量三层结构质量控制策略。以某型号汽车发动机缸体单元装配为例,验证了所提方法的实用性。

关键词: 数字孪生, 知识图谱, 装配工艺, 质量控制, 高精密产品