Research On Theory And Method Of Optimal Configuration Of Reconfigurable Machine Tools In Network Alliance

ABSTRACT:Reconfigurable machine tools (RMT) are being developed to respond rapidly to changing market demands. With a modular structure, which allows specific components to be added and deleted as the operation requirements change, it provide customized flexibility for a specified range of operation requirements within a part family that enables it to combine the advantages of high productivity of dedicated stations with the flexibility of CNC machines. To achieve this goal, enterprises cannot confine to their own internal resources any more, but have to be more effective utilization of external manufacturing resources with the comprehensive consideration of the enterprise information exchange, resource sharing and collaboration, to realize the optimal allocation of RMT. So, extend the research topic of RMT into the Network Alliance (NA) environment, and study the theories and methods of optimization configuration of RMT are very important and practical significant.This paper analyzed the features and complexity of optimal configuration of RMT in NA environment, and studied the overall framework, the concept model and configuration process of optimal configuration system of RMT in NA. The basic theories and key technologies to realize the optimal configuration of RMT in NA were studied, including the definition and model methods of machining task and RMT mechanical module, configuration evaluation and optimization, etc. The main contributions and works of this dissertation are as follows:The basic theory of optimal configuration of RMT in NA was discussed and analyzed. Based on the production paradigm of RMT, the resource sharing platform and mode of for RMT optimal configuration were established. The necessity of extension of RMT configuration into NA environment was brought. The concept definition and key processes of RMT optimal configuration in NA were proposed.The modeling and definition of machining methods were proposed, which determine the machining and reconfiguration function of RMT. First, the universal and formal extension element model method and XML description method were proposed based on definition, classification and enrichment of machining feature (MF). Then a new approach of machining feature family generation for RMT configuration synthesis was proposed using extended-hybrid graph theory and heuristic algorithm, and a standard case study was used to validate its feasibility and effectiveness.In order to realize the multi-objective decision-making of optimal configuration of RMT in NA, the two level optimization strategy, RMT preliminary configuration and optimization generation of RMT configuration path, was proposed. The preliminary configuration of RMT:First, based on the definition and description of the problem of preliminary configuration of RMT, a RMT mechanical module selection model method using layered network was constructed. Then, according to module selection constrains, feasible module selection path set was generated. To calculate the path capacity, a uniform quantitative measurement method was proposed, and module evaluation index were classified to static, dynamic indicator according to their influence to the path capacity, and then the P-best combination schemes of RMT configuration were obtained.The optimization generation of RMT configuration path:First, the multi-objective optimization mathematical model was established based on the definition of this problem, then, the model was modified to a two-step optimal decision model using multi-level extension superiority evaluation method, based on the modified model, a solution method using the modified discrete particle swarm optimization (MDPSO) algorithm was proposed to generate the best RMT configuration path scheme.Supported by correlative research project, an optimization configuration prototype system of RMT in NA (RMTOPTCONFG@NA) was developed based on the technique framework of ASP.NET. Take the typical part family of ANC-101, ANC90as example, the theories and methodologies proposed in the dissertation were applied and verified.