Research On Optimization And Application For The Scheduling Process In Mechanical Manufacture

Scheduling problem is one of classical problem in manufacture process which appeared with industrialisation production and developed in last few decades. Under the financial crisis background, mechanical manufacture industry faces more troubles, including management risk increasing, serious flow financing shortage due to financing chain contraction, higher and unsatisfied order request and so on. And all these troubles make the competition grow between manufacture enterprises, especially between small and medium-sized enterprises which will be washed out without any change. In order to enhance competition power and tone up the resistance for financial crisis, it is more important but technique renovation to plan and constitute effectual scheduling scheme fitting for self-characteristic of enterprise so as to reduce the cost, enhance the benefit, accelerate the financing flow, improve the timeliness and validity for orders, heighten the credit standing of enterprise and enhance competition power on "software".The scheduling problem in manufacture process is the reseach object in this paper and different scheduling model is built with combining the production realization of Shanghai Jingzheng Mechanical Equipment Ltd. and surveying different kinds of restriction. Then through the analysis for the character and quality of these models, specific algorithms is put forward for machining parameter optimization and realized by computer programme and system simulation to validate the rationality of models and validity of algorithm.Cost analysis model is built through analysing and summing up the relationship between different kinds of cost in manufacture process and the change of cost before and after manufacture. Some restrictions are added to cost analysis model to simulate production request and relevant algorithm is originated to calculate and validate the the rationality of models with practical example of enterprise. In addition, in virtue of modern production logo such as "Just-in-time manufacture", "delay-starting operation", some algorithms or thoughts aiming at some models are put forward and tested after the two basic restrictions in scheduling model——time restriction and resource restriction are classified and discussed. Several solutions, including improvement for fitness calculation appraoch, genetic operator and innovation for genetic rule, are advanced in this paper for the problems appearing in calculation course by genetic algorithm such as super average phenomenon, super individual phenomenon, too slow convergence rate and too low efficiency. As compared with the unimproved algorithm and the algorithm appearing in literature, the result of improved algorithm shows that the algorithm is improved successfully. Moreover, parameter optimization scheduling system oriented to two grades of users is built and realized by programme on the basic of algorithm amelioration and the structure and running mode of each part are introduced.The research content of this paper is integrated with the case of practical manufacture closely and the correctness of models and validity of algorithm are validated by the practical manufacture course of Shanghai Jingzheng Mechanical Equipment Ltd.. The result shows the new model can guide the practical production directly. All the result and conclusion of the paper which are true and available, are significative and valuable for modern manufacture level improvement of mechanical manufacture enterprise.