The Research Of Process Decision-making Technology For Valve Product

Intelligent process planning technology is one of the hot technologies to which much attention is paid at the current time. The applicable CAPP system has not been found yet although plentiful research has been done by experts from home and abroad. The paper is intended to have a deeper study of valve product CAPP system process decision technology and develop WHUT-CAPP system incorporating valve products focusing on the problems existed in the research and development of process planning and CAPP system. The scope of the research covers:(1) The study is based on Hubei tri-ring limited company as its application background and valve is the object of the study. The characteristics and classification of valve are described and the detailed descriptions of features are provided including the definition classification and relationships between features in the paper. Feature model of parts is also established. And finally the illustrative examples of the valve features are given according to the example of TU5JP4 valve.(2) Basic on a detailed description of part classified codification system paper presents power code classified codification's structure, composition and so on in view of OPITZ. JLBM-1 part classified codification system's insufficiency in the application of CAPP. Meanwhile the paper develops the system and carries on code to the valve.(3) The main technology methodology based on process similarity is to establish parts feature model based on database. On the basis of parts feature model, the applicable and practical analogy process similarity is developed to realize. The paper proposes a method of calculation of valves similarity research and illustrates its application in CAPP by giving examples.(4)The process decision method based on cases. Case Based process Planning, CBPP is the main contents of CAPP. Whose basis theme is solving newly-existed problem is by the results of the solved problems. It is based on the method of Case Based reasoning which has been developed and applied in CAPP. The paper deals with the application of CBR in CAPP. Valves process decision based on Cases and studies. Illustrative examples are included to demonstrate the valve process tragedy.