Assembly Reliability Modeling Technology Based on Meta-action

For the purpose of assembly quality control of CNC machine tools, this paper conducts the structure decomposition based on PFMA (Pedigree-Functions-Movement-Action) for CNC Machine Tool, and proposed the concept of “functional spectrum”. Take the movement function of CNC machine tools as a starting point, CNC machine tools were decomposed from the functional spectrum into the element action of the parts. In this process, we construct links to represent reliability quality relationships of element action assembly units, and then definite a link attribute called contribution degree, which measures the contribution of characteristics compared to links, for reliability analysis require of assembly process, and build a link network and link matrix model, finally, we use the link matrix model to the element action assembly units through the PFMA decomposition process from CNC rotary table to element action. The reliability was calculated to verify the applicability of the link model in the aspect of reliability quality characteristics structured modeling of element action assembly units.