Optimal allocation method of assembly accuracy of CNC machine tools based on meta-action unit chain

Abstract In response to the challenges of complex error propagation paths, reliability assurance, and assembly cost optimization in the accuracy allocation of CNC machine tools, this paper proposes a accuracy allocation method based on meta-action unit chains. First, the machine tool is decomposed according to the ‘Function-Motion-Action (FMA)’ principle of meta-action theory to obtain meta-action unit chains and meta-action units. Establish an error propagation model between same-level action units and different-level action units. Secondly, integrating complexity and reliability factors, establish a comprehensive multi-objective optimization model for assembly accuracy based on ‘accuracy-cost-reliability’. Then, through the unique ‘meta-action unit chain(-)transmission pair’ and ‘transmission pair(-)meta-action unit’ two-level allocation strategy, a reasonable allocation result is obtained. Finally, taking a specific model of machine tool CNC turntable as an example, the rationality and effectiveness of this method are illustrated.