Study On The Manufacturing Process Integrated Reconfigurable Machine Tools Configuration And Optimization

Reconfigurable Machine Tools (RMT) is a new type of machine that conforms to the future development trend of manufacturing. At present, RMT configuration optimization and manufacturing processes optimization are seen as two independent issues in most domestic and foreign research, but there is a non-negligible relationship between the two issues. Collaborative optimization of manufacturing process and RMT configuration is conducive to access to a low-input and high-output manufacturing system. Therefore, the research topic of this thesis is manufacturing process integrated RMT configuration and optimization, in order to obtain a feasible solution.(1) Based on the analysis of RMT characteristics, a research idea of manufacturing process integrated RMT configuration and optimization is expounded to construct a four-tier research framework. The key problems of the framework are discussed, and the technical routes are formed to solve the problems.(2) The feature processing unit is defined by analyzing the classification of processing features and describing feature forming method. Based on the feature processing unit, the machining information model of the part features is established and the process constraints between the feature processing units are present. The model of the process route planning problem is proposed. To solve this problem, a genetic algorithm is designed and the feasibility of the algorithm is verified by an example.(3) Based on the function and structure, RMT mechanical system is divided into sub-modules,and functional components are constructed according to the correlated characteristics between the sub-modules. The model of functional components group is established by using polychromatic sets theory. Combined the model, a mapping method from process to RMT configuration schemes is proposed and the method is demonstrated through a study case.(4) From the two aspects of process and process route, the local optimization and global optimization of RMT configuration schemes are carried out. To achieve local optimization, taking the reduction of cost, modules number and function redundancy of RMT as optimization target, a simple linear weighting method is used to optimize the feasible RMT configuration schemes of process. To achieve global optimization, taking the reauction of cost, modules number and function redundancy of RMTs as optimization target, The feasible RMTs configuration schemes are optimized by combining with ideal point method and genetic algorithm. The validity of the methods are proved by examples analyzing.