【正文】 ablish the relationship information for PIM. With PIM, where the knowledge is encapsulated in objects or decisionmaking knowledge procedures, the process planning can be pleted through corresponding sets of knowledgereasoning. This model is a dynamic expanded information model, in which the information can be added and updated along with the process of planning. Information management and control is a part of PCS in IMM of process planning, which can monitor the change or modification of process plan ning, and timely update the information to insure the process information model and process planning synchro nization. In process planning, the information management and control begins its control and judgment from the time that the stamping design features have been created until the planning ends. Process path planning and tools option Generally, the forming of an automobile panel includes several operations, such as drawing, trimming, flanging, piercing, restriking, hemming, etc. Among the operations, drawing, trimming and flanging are the main operations to form the main shape of the product, and other operations are auxiliary operations, which work together with the main operations to form plex shapes of the product. To get precedence relations among operations based on the PIM, the main operations must first be determined, and then the decisions are made about how to arrange the initial main operations, how to bine the auxiliary operations with the main operation, and how to insert auxiliary operations to the operation sequence. For the integration of planning, it should consider the stamping dies’ capability, cost and capacity of machinery or workshop as critical issues at the sequencing level. Theoretically, casebased reasoning (CBR), rulebased reasoning (RBR), and modelbased reasoning (MBR) are all applied for process planning. In this paper, CBR, RBR and artificial neural work are joined up as the decision making methods after modelbased reasoning during process planning, which is shown in Fig. 8. Firstly, the modelbased reasoning is used to form a code of the product and operation for CBR based on feature entities and their interrelationships, and relevant rules or knowledge for others reasoning. Then the CBR is selected to get similar plans for the case base。 if CBR is not suited, the RBR and ANN are select to plete the task cooperatively. During sequencing of forming operations, the structure of the die for each operation can be performed from the operations and assigned stamping features. The system can plan the equipment and operators for each operation to meet design specifications, and to achieve minimum machining time and maximum efficiency based on the above activity and knowledge. Finally, the optimal process plans obtained can be added into the case base of plans for the planning of other similar products. Customarily and practically, the relationships between operations consist of operations order constraint (doafter), which relates to the necessary order of operations to be used, and operations bination constraint, which relates to relevant operations that can be formed at one process and die together (mentioned in Sect. ). For example, flanging is after trimming, while piercing and trimming are always formed in one process. For the aims of economic efficiency and topquality, it is always remended to bine the potential operations together, while making the sequence operations practical. Therefore the initial main operation sequence is Blank ing→ Drawing → Trimming → Flanging for a flange feature prised part, and Blanking → Drawing → Trimming for no flange feature part. With operations sequencing and bination rules, auxiliary operations are added to the initial main operation sequences to form final process routing. The following is the bination rules for hole1 and hole3 shown in Fig. 3 : (Logical) bination (for hole1 and hole3): IF distance between hole1 and hole3 DIS amp。 the angle of the vectors of the two hole15 it manages the process information model, process planning to generate stamping process plans and detail design, and controls the changes of the planning. In IMM, the PCS es into being dynamically along with the process planning. If one part of PCS is created, it will monitor and control relevant planning and information subsequently. When results of process planning are deleted, the corresponding PCS part will fade away accordingly. The LE provides several methods to deal with the links among process planning procedures, the geometry between product and detail design of work pieces. To achieve intelligent process planning for large plicated stampings, there are problems to solve, . linking of process planning procedures, the geometry link between product and detail design of work pieces. The LE provides several methods to deal with these links, . parameters variable link, data structures link, and geometrical link. The PPO is a methodology of design optimum for plex engineering, which can deal with the plicated optimization problem of process planning in an economic view. The framework of CAPP system based KBE The stamping CAPP system for automobile panels based on the intelligent master model above consists of several stages such as stamping features extraction from product data, operation features reasoning from stamping features to form a process information model, process planning to get the sequence of operations and relevant tools, detail design for work pieces, simulation for detail design, and finally the process plans and 3D dieface model generation which is shown in . It is a tangible activity level to control and frame a CAPP system for automobile panels. In the CAPP system, stamping process planning of automobile panels needs to first establish a process information model