Controlling on the Consistency of Accumulated Assembly Errors Under Digital Manufacturing Environment for Aircraft

To ensure the relative consistency of cumulative direction and size for the accumulated error between two assemblies, controlling method for assembly coordination accuracy was studied under digital assembly environment. Based on the qualitative analysis on the main factors that would cause the consistency problems, and the key technical problems to be solved on interchangeability and coordination for actual production, the coordination accuracy guarantee method was developed. It can be decomposed by four detailed controlling schemes, i.e. (1) identification and controlling of coordination elements for aircraft products, (2) analysis on the mapping relations between the coordination elements of aircraft products and the manufacturing process coordination elements, (3) analysis on assembly coordination relationship, and (4) analysis on assembly error propagation and coordination error chain construction between different assemblies. Then a whole closed cycle process, namely “4 + 1”, was proposed to accomplish the feedback adjustment process for coordination dimension. With the adjustment on manufacturing process and the modification on coordination error links, the research on the controlling method for coordination accuracy can improve the quality and efficiency of the dimension and shape transfer process.