Research on the State-of-art, Connotation and Key Implementation Technology of Assembly Process Planning with Digital Twin

Abstract

Based on the entire digital coordination transfer process in manufacturing process, with the strategy of 'fusion of virtuality and reality, control the reality with virtuality', the optimization-feedback-improvement loop mechanism of assembly process that driven by digital twin model is studied. Firstly, the essence and technical composition of (1) the quantitative partition/solution/evaluation of assembly unit, (2) the construction of digital twin model, and (3) assembly precision controlling with a closed-loop are analyzed, and the research status and existing problems are summarized. Then considering the detailed constraints of design in virtual field and assembly in physical field, three key technology are proposed, i. e. (1) assembly process planning and evaluation with the thought of DFA, (2) dynamic construction and analysis of twinning process model considering physical topological relation, (3) optimization-feedback-improvement ring mechanism construction orienting for the actual assembly field. Then the specific solutions and possible innovation directions are given. With the above analysis, the connotation of manufacturing technology based on virtual model can be expanded. Finally, the closed-loop optimization decision of production activity and the change of product development mode are expected to be realized in product development and production, and the assembly accuracy/consistency and assembly efficiency can be improved.