A new generation of CAM is about to emerge (3)

(3) High efficiency requirements

High efficiency is reflected in two aspects: 1) high efficiency of programming: the technical requirements of high-speed machining are much higher than traditional CNC machining. The length of the tool path is hundreds of times that of traditional machining. The general programming time is much longer than the machining time, so the programming efficiency It has become one of the key factors affecting overall efficiency. The traditional CAM system adopts the programming method of the local surface, the system can not automatically provide the process features, the programming complexity is very large, and the programmers need high skill in addition to the process level (basic requirements). There is an urgent need for a new generation of CAM systems with a high-speed processing knowledge base and a high degree of intelligence for the overall model. 2) Optimized tool path ensures high-efficiency CNC machining, such as intelligent programming based on residual model, which can effectively avoid empty knives, and the feed rate (f value) optimization process can improve cutting efficiency by 30%. 

In summary, although today's CAM system has contributed a lot to the development of modern manufacturing, there are huge contradictions between the production management and operation and the actual requirements; in terms of structure, function specialization, etc. There is a serious inconsistency in the requirements of integration; the basic processing methods seriously hinder the improvement of intelligence and automation. All of this makes the birth and development of a new generation of CAM necessary. The great success of object-oriented and feature-oriented modeling in CAD technology provides a reference model for the development of a new generation of CAM. Network technology provides the possibility for professional separation and system integration of CAM. Through the above analysis, the outline of the new generation CAM system has emerged. 

Third, the basic structure and main features of the new generation of CAM prediction 1. The new generation of CAM hardware and software platform

Wintel structural system has replaced Unix operating system as a support platform for CAD/CAM integrated system due to its excellent price performance ratio, convenient maintenance, excellent performance and plain peripheral software support. The application of ole technology and d&m technology will make system integration more convenient. In the future, the CAM software platform will undoubtedly be Windows NT or Windows 2000. The hardware platform will be a high-end PC or nt workstation series. With the development of the high-end nc control system, the networking and the professionalization and intelligent development of CAM, even on-board programming may have a great development.

2. The interface form of the new generation CAM system

In the future, the multi-menu interface interface form will be abandoned, and the windows interface will be replaced. The operation is simple, and the project management and process management tree structure are attached, which lays a foundation for the integration of pdm.

3. Basic features of the new generation CAM system

(1) Object-oriented, process-oriented CAM system

The architecture of the traditional CAM board surface as the target will be changed to the overall model (entity), the structural system oriented to the process characteristics. The system will be able to automatically identify and extract all process features and areas with specific process characteristics according to process requirements (CAPP requirements), making CAD/CAPP/CAM integration, integration, automation and intelligence possible. 

(2) Knowledge-based intelligent CAM system

The new generation of CAM system not only inherits and intelligently judges the process characteristics, but also has model comparison, residual model analysis and judgment functions, which makes the tool path more optimized and more efficient. At the same time, the form facing the overall model also has the functions of anti-overcutting and anti-collision repair for the workpiece including the fixture, improving the safety of the operation, more conforming to the process requirements of high-speed machining, and opening the process library, knowledge base and material library associated with the process. And the tool library makes it possible to accumulate, learn and use process knowledge. 

(3) CAM system capable of running independently

It is functionally separated from the CAD system and integrated in the network environment. This requires a CAM system that must be fairly intelligent. The CAM system does not require CAD functions, and is automatically programmed according to the process documentation, which greatly reduces the requirements for the operator and makes the programming process more in line with the engineering requirements of CNC machining. 

(4) Make correlation programming possible 

The characteristics of CAD, such as size-related, parametric design, and flexibility of modification, naturally hope to be extended into the CAM system. According to the author's observation, there are two different ideas in this direction. The powermill and worknc of DelCAM are used as the representative, and the process-oriented processing method is adopted. The system automates the CAM programming with the automation of process feature extraction. When the model changes, as long as the original process route is recalculated, the automatic modification of the CAM is realized. The re-judgment and automatic processing of process features and process areas are automatically performed by the computer, making correlation programming possible. At present, mature products have been put on the market and accepted by the tool and die industry in developed countries such as North America and Europe. It has also been reported that companies have attempted to directly introduce parametric concepts into CAM, allegedly in the same database to solve parametric programming problems. According to the author's understanding, there have been no successful application examples and related reports. From a technical point of view, the author believes that the parametric design of the entity is a special concept under finite parameters. CAM is the discretization of the model according to the process requirements, and has the characteristics of infinite (or uncertain) parameters. Therefore, it has completely different characteristics from parametric CAD. Just as the concept of parameterization has not been successfully extended to surface CAD, the parameterization of CAM will also face enormous difficulties. According to the engineering concept of processing, CAM is not treated with geometric features, but with the aim of process characteristics. There is no necessary and unique correlation between geometric features and process features. When geometric parameters change, there is no correlation between process feature changes, and there are some process features that disappear or new process features are generated. Therefore, in order to realize the parametric CAM, it is necessary to carry out in-depth research on the correlation between geometric parameters and process features, and to obtain the exact, and only the relevant relationship, can be truly realized. Therefore, in terms of the practicality of the system and the possibility of success, the author is more technically inclined to the former. Perhaps the two will go the same way. We will always pay attention to and eagerly hope that the latter can make breakthroughs in technology and make CAM technology achieve a qualitative leap on the parametric road. 

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