Technology of Automatic Generation and Update of Assembly Dimension Chain for Assembly Process

This paper proposes a technology of automatic generation and update of assembly dimension chain for assembly process. First, the dimension tolerance unit and assembly constraint unit are constructed by analyzing the assembly model layer by layer, and the assembly sequence information is introduced. The search priority of dimension chain is determined according to the assembly sequence level. Then the dimensional tolerance unit is preprocessed, and the automatic transmission of the assembly relationship is realized according to the connection between the associated objects based on the information unit. Next, the optimal assembly dimensional chain is obtained by traversing the assembly relationship transfer diagram according to the search priority of the dimensional chain. And the assembly dimension chain is updated in real time according to the actual assembly progress. Lastly, the assembly chain is automatically generated and updated on the prototype assembly process planning system.