Optimation Technology On NC Machining Cutting Parameters And Strtegies Oriented To Mould Cavity

Technology of NC machining is the base and key of modern automatic, flexible and numeric machining technology. It is an important research subject in modern mechanical industry to improve the efficiency of numerical control process. The intent of this article is to present the way to improve productivity and reduce productive cost by setting up optimization system to achieve reasonable machining parameters.In process of NC machining, especially in process of machining complex surfaces, the cutting conditions can change. However, cutting parameters are still chosen artificially and remain unchanged in present process of NC machining, which causes the decrease of NC machine productivity.In this paper, the optimization of varying machining parameters for NC cutting operations is discussed. It can improve the efficiency effectively. Using the method a great deal of technologists could be released from the repeated and rationalization and standardization of cutting parameters will be realized, productivity of the machining center can be improved and well economy benefits should be obtained consequently.The milling database and expert system for mould&die is developed in this paper. The system has the following functions: the search of the mould&die materials, the selection of cutting tools and the inquiry of cutting parameters. For the shortage of milling data, the system has also introduced the artificial intelligence technology, and the system can recommend rational machining process and cutting parameters for new tool materials and workpiece materials by the same way of human expert's mode of thinking. The following tasks have been studied:1.The construction of system's frame and design scheme after the process of collecting mould &die material data, milling data and expert experience and knowledge in the enterprises at home and abroad;2.With the basic principles of database design and software engineering, the milling database and expert system for mould&die is developed after the research of conceptual and logical structure of data. The purpose of logical design is to turn result of conceptual design into relation mode that is supported by Microsoft SQL Server 2000 DBMS.3. This paper mainly introduces the system structure, knowledge acquisition, inference mechanism and implementation of each module, setting up optimization function aimed at low cost and made three parameters of machining to be independent variable. It applies tools and machining parameters combining optimization function and inference mechanism of expert system.