Priority order recognition method of module redesign for the CNC machine tool product family to improve green performance

Abstract

To solve the sequencing problem of module redesign in the greening process of a CNC machine tool product family, a priority order recognition method based on the fuzzy analytic hierarchy process (FAHP) and grey relational analysis (GRA) was proposed. A hierarchical model of the functional modules of the CNC machine tool product family was constructed, and the types of functional modules were divided. The generality coefficient of the functional modules was proposed to reflect the influence of the module types on the redesign priority order. A green performance evaluation indicator system for module instances of the CNC machine tool product family was built, based on which a life cycle-oriented green performance priority order recognition method was established. FAHP and GRA were utilized to evaluate the green performance of module instances. Then, the priority order of module redesign can be determined by the ratio of the green performance evaluation value to the generality coefficient. The feasibility and effectiveness of the proposed priority order recognition method were verified by an applied case of module green redesign sequencing of the gantry machine tool product family. The application case showed that the proposed priority-order recognition method based on FAHP and GRA provides a scientific basis for companies to carry out the greening improvement project of the gantry machine tool product family.