Research On Key Technologies Of Knowledge-based CAPP Tool System

With the arrival of knowledge economics, the value of knowledge management to enterprise products and services is becoming larger and larger, and knowledge is becoming kernel assets of an enterprise. CAPP, as the manufacture information process unit of the manufacture enterprise, is essential for the enterprise information construction. It is very important to research into the theory, method and implement technology of CAPP based on knowledge in terms of jointly studying knowledge process and CAPP system. For this reason, the thesis launches investigation into knowledge-based CAPP tool system from the aspects both theoretical and practical.The thesis discusses the definition of"knowledge-based"and tool-kited thought and elaborates characteristics of system, presents the function framework composed of process knowledge definition, maintenance and reasoning and interpretation for knowledge-based CAPP tool system, and admeasures the total architecture of system realization and the related key technologies, including the process knowledge expression, integration and share, etc..On the basis of analyzing various popular knowledge expression methods, the thesis adopts a new process knowledge expression method, parameter flow chart knowledge expression method. The method expresses dynamic engineering knowledge by a parameter table encompassing all variables impacting knowledge expression, via the variable values change to express process knowledge dynamically and an oriented digraph consisting of graph element sets and relations between graph elements to realize the visualization of the workflow knowledge.Against the issues such as process knowledge integration and share, the thesis adopts the process information document based on XML technology. XML document is a medium of process information storage and transfer, and satisfies considerable information integration under networking manufacture. The data of XML document are stored in tree architecture; the records with the logic relation of fathers and sons keep the same relations in the XML document, forming a nested tree architecture.As the result of research, the thesis introduces the process knowledge management and application by a drogue example.