Research On Key Technologies Of Manufacturing Execution System Oriented To The Mold

Mold industry is the important part of national economics, and the development level of mold manufacturing represents the level of national manufacturing at some degree. Although there are some advances in mold manufacturing, yet there exists a big discrepancy compared with other developed countries. Besides the discrepancies in manufacturing technology, as manufacturing process becomes more and more complex, and it makes very difficult for the mold management, thus which make some discrepancies in management compared with some other countries. The development of manufacturing execution system (MES) provides systematic solutions for the management of mold enterprise in our country, yet there some limitations in application of MES. This can explain in two sides, and the first reason is that the research and application of MES has not reached maturity level, on the other hand, it caused by the special characteristics of mold manufacturing. So , we build the mold MES model, and research on the related problems of mold MES.The characteristics of mold manufacturing is studied, and then the functional mold of MES is proposed, which is extended to up level of mold enterprise as there exists the mold process problem of dependence on the experiences of technicians., so that function mold process is integrated into the functional mold of MES.The architecture based multi-agent is built, which is divided into three parts including shop, virtual manufacturing and facility, and the virtual manufacturing part is organized based on the project teams, so that the structure not only satisfies the characteristics of extending, rebuilding, distribution and agility,but also satisfies those characteristics of organization of mold manufacturing.The scheduling is the core part of MES, and process planning is the basic and premise of scheduling. The problems of process restriction requires some solutions to mold process planning.So, the concept of process restriction is defined, and then combined procedure is proposed according to the problem of mold work parts restriction, and three kinds of combined procedure is analyzed , thus the model of mold process planning is proposed. The algorithm of mold process planning combining the composite procedure is researched, and the process of mold planning is divided into two steps, the characteristic of single form is completed by using fuzzy inference in first step, and the processing route is further ranked by the genetic algorithm for the mold pieces planning combined with classical process routes in the second step. Hence, the whole project of mold process and the restrictions among mold work parts can be derived.The mold MES must deal with the scheduling problem of mold work parts restrictions. At first, the scheduling problem of mold restriction is described, and then designate that it is a Job-shop problem of flexible process route and complex process restricition. The ant colony optimization (ACO) and the dispatching priority heuristic algorithms to solve the scheduling problems exist in the manufacturing of the mold parts which have work piece restrictions is proposed, It first determines the machines to be used in each working procedure by ACO and then set the sequence of the parts to be machined in the same machine.The relevant parameters of ACO and the dispatching priority heuristic algorithms are studied, the experimental results show that the algorithm can deal with the mold parts which have work piece restrictions, furthermore, the optimization performance of ACO and the dispatching priority heuristic algorithm is found more effective and superior compared with other algorithms.A dynamic scheduling algorithm based on moving window and considering both the local and global updating has been put forward for real-time mold scheduling. Local updating strategy is adopted for those turbulences that happen in high frequency but have little effect on the scheduling; otherwise, global updating strategy is adopted. The scheduling efficiency is improved as well as the near-optimum solution is guaranteed in this way.The original mold MES system is built, and the mainly function of agent is implemented based on multi agent system.