Second, the direction of CAM innovation CAM as an applied, highly practical professional technology, direct to CNC production. The actual demand for production is the driving force behind all technological development and innovation. Analysis and summarization of the current status of application of CAM, and the gap between the actual production requirements and its reasons, new processes, new technologies and special needs of CAM, and related peripheral technology development and requirements, etc., help to better understand the future development trend of CAM .
1. The gap between the actual application of CAM and the actual needs is due to the fact that the application is more practical and the division of labor is more specific. Overall, the level of specialization of CAM is higher than the development of CAD. Looking at the dominance of CAM systems today, regardless of the interface is good or bad, the strengths and weaknesses, there are common defects.
(1) CAD/CAM hybrid system architecture The CAD function and the CAM function are used interchangeably. It is not a programming mode that faces the overall model. Process characteristics need to be extracted manually, or further CAD processing is required. The formation of this structural system is a product of history. Many years ago, the notion of integrated systems, especially networked integration, has not become the main idea of ​​system development. The establishment and programming of the model are performed by the same operator in the same place. This can cause the following problems.
1) Discomfort should be integrated today's requirements Modern production companies require that the network distribution system's module distribution and function focus must be matched with the company's organizational form and production layout. System mixing is not equal to integration, and it is not conducive to the realization of network integration.
2) The hybrid system is not suitable for the requirements of the specialized division of labor in modern enterprises. The division of work between design and processing in management cannot be achieved, the difficulty in production management and division of labor is increased, and the level of intelligence and automation is greatly impeded. In addition, the hybrid system requires the operator to have a profound background and experience in both CAD and CAM to be able to complete the work well and increase the difficulty of learning to master and use the system. It usually takes 1 to 3 years of practice to become a competent CAM operator, which has a great negative impact on the management of corporate talent.
3) There is no space or possibility for CAPP development. As we all know, CAPP is a bridge for CAD/CAM integration. The CAD/CAPP/CAM hybrid system determines that intelligent and automated CAM can never be realized. Because of the low degree of standardization of the production process and the impact of factors such as production equipment, tools, and management, there has been no mature commercial CAPP system that uses the creation method or derivative method as the reasoning mechanism. CAPP turned to development and research similar to development environment software systems. However, with the successful application of CAD, CAM and other technologies, the improvement of the technology library and knowledge base, CAPP will have corresponding development in the future. Gradually realize the integrated integration of CAD-CAPP-CAM in a scientific sense. The hybrid system leaves an irreparable hidden danger for its future development.
(2) Surface-oriented and local processing are the basic processing methods Today's CAM systems are generally curved surface CAM systems, which are local-oriented processing methods, and CNC machining is the engineering process with the model as the result and the process as the core. Should adopt an overall model-oriented, process-oriented features of the treatment. This kind of non-engineering concept will surely cause a series of problems.
1) The CAD model's geometric information cannot be effectively used, the model's process features cannot be automatically extracted, and only manual extraction is possible. Even re-simulation calculations are used to obtain the necessary control information, which undoubtedly increases the cumbersomeness of the operation and affects the programming quality. With efficiency. As a result, the degree of automation and intelligence of the system is very low.
2) The local processing calculation method is artificially or semi-automatically performing the imitation cutting processing, because it is not an overall model-oriented programming object, the system does not fundamentally eliminate the possibility of over-cutting, and thus is not suitable for high-speed processing and other new processes under high-speed conditions. Security requirements. (To be continued)