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The use of CAPP system can not only greatly improve the efficiency and quality of process design, but also ensure the consistency and standardization of process design. More importantly, process design data is to guide enterprise material procurement, production planning and scheduling, organization of production, resource balance, The important basis for cost accounting, so the promotion of the use of CAPP, the adoption of new process design technology, is an important means to improve the competitiveness of enterprises and promote technological progress. The basic principle of CAPP The different production characteristics of the enterprise have different application requirements for CAPP. Therefore, understanding the basic principles, main features and applications of the CAPP system is crucial when selecting and using the CAPP system.
CAPP system can be divided into the following five categories according to its working principle: interactive CAPP system, derivative CAPP system, generative CAPP system, integrated CAPP system and CAPP expert system. Interactive CAPP system. The man-machine dialogue method is based on standard work steps and typical processes, and the design quality of the process rules is very dependent on people. Derivative CAPP system, using group technology to classify process design objects into groups according to their similarities (such as parts according to their geometry and process similarity; parts according to their structural functions and assembly process similarities, etc.) for each group The object is designed to be a typical process and a typical process library is built. When designing a process for a specific object, the CAPP system retrieves the corresponding typical process according to the part (component or product) information and classification code, and modifies the typical process according to the structure and process requirements of the specific object until the actual production needs are met. Generative CAPP system.
Process design based on process decision logic and algorithms, which is a process specification that automatically generates specific objects from scratch. Generative CAPP system process decision-making does not require manual intervention, so it is easy to ensure consistency of process procedures. However, due to the variability and complexity of the manufacturing process changes with the manufacturing environment, it is very difficult to realize the CAPI system for complex and diverse parts. The integrated CAPP system is a system that combines the advantages of derivative, generative and interactive CAPP. At present, many CAPP systems in China use this type of mode. CAPP expert system is a CAPP system based on artificial intelligence technology, also known as intelligent CAPP system. Both the expert system compressor technology and the generative CAPP system generate process schedules in an automated manner. The generative CAPP system is characterized by a logic algorithm plus a decision table, while the expert system is characterized by a knowledge base plus an inference engine.
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