Design And Realization Of CAPP Of Turbine Parts

The modern machine manufacture system, Computer Aided Process Planning (CAPP) is the link of product design and the workshop production, and the bridge of joining the CAD and the CAM. This thesis discusses the fundamental conceptions, principles, classification, actualities and development trends of CAPP in detail. This thesis is based on practical production, face to the production environment, with the most base and actual need of the enterprises, detailed analysis and study the process data founding, and the parts information describing and obtaining, the creating manner about process and its drawing, the process document outputting etc., bring up the research way about practical CAPP which is based on the technique in database and group technology, using variant method. This subject proposed the overall plan of the engine part CAPP system which was based on the database and completed the corresponding overall frame and the systematic host from this the construction controls the module, the components characteristic design module, the craft database handling module, the craft decision-making module and the technological document processing module and so on the main function module. Meanwhile, this paper has analyzed the CAPP system's construction of data characteristic, We has carried on the research in the data model and the database construct method, also we proposed the open style database structure design pattern. This system used the Microsoft Access to establish database. Simultaneously according to the system function request, we has constructed some easy databases for system. Based on the system's advancement and relevance of the system, this subject has classified the turbine parts in accordance with the code rules, and then the product databases and templates, to completed development process Turbine Company LTED plans automatically generating system. Database, CAPP system built form and functional classification. In the course of the study, With the group and classification and coding techniques , the data were analyzed and summarized and included into the ACCESS database. Combined with the VB language and EXCEL AUTOCAD complete system framework and functions of the filling. Eventually create CAPP system on Turbine Diaphragm,and it provides the interface and experience for other parts automatic process planning system.CAPP (computer aided process planning, computer-aided process planning) is to use a computer for processing parts of the development process, the rough machining into engineering drawings of parts required. It is to be processed through the computer input part of the geometric information (shape, size, etc.) and process information (material, heat treatment, batch, etc.), automatically by a computer output part of the process route and process content, process documentation process.In fact a number of commonly used abroad, such as manufacturing planning (manufacturing planning), material handling (material processing), process engineering (process engineering) and process routing (machine routing), etc. refers to a large extent the design process. Computer-aided process planning are areas of engineering analysis and design, production preparation work is an important one. As the computer integrated manufacturing system (CIMS-computer integrated manufacturing system) the emergence of computer-aided process planning and computer-aided design (CAD-computer aided design) phase, the next and computer-aided manufacturing (CAM-computer aided manufacturing) is connected, is connecting bridge between design and manufacturing, design information can be generated only through the manufacturing process design information, design only through the manufacturing process design can be achieved with the features and information integration. Thus CAPP in production automation in an important position.CAPP system structure, depending on its working principle, product objects of different size are quite different. The basic building blocks of CAPP system include: (1) control module. The main task of the control module is to coordinate the operation of each module, makes machine interactive window to achieve human-computer exchange of information between the control part information access methods; (2) part information input module. When the part information directly from the CAD system can not access, use this module part of information input; (3) process design module. Process design module for processing the decision-making process, resulting in process card for the processing and production management departments; (4) decision-making process module. Decision-making process module's main task is to generate process cards, between the size of the window on the process to generate process plans; (5) decision-making process step module. Process step-step decision-making module for the content of design work to determine the cutting, NC machining to provide control instructions to form the required cutter location file; (6) NC machining instructions generated modules. NC machining process step instruction generation module based decision-making module provides the cutter location file, call the NC command code system, resulting in control NC machining instructions; (7) output module. Output module can output process cards, process cards, card, process step, process maps and other documents, process the output file from an existing library can be transferred out of various types of craft paper, use editing tools to modify existing processes to the file process documents required; (8) process dynamic simulation. Dynamic simulation of the process generated by the simulation process, inspection process is correct.