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Compared with the traditional two-dimensional process diagram, the three-dimensional process diagram model has the following four advantages: (1) It is more in line with the craftsman's design habits, and the craftsman can strongly couple with the computer through interaction, reducing the error amount of the process design ( 2) The process design adopts the three-dimensional model, and the assembly form of the enterprise's information 3D entity explains the relationship between them. 'In some large specialized equipment production plants in China, there are nearly half a century of professional product development and production experience, some The main process of typical parts is relatively mature and stable. In the early stage of information construction, what is really needed is to convert these paper process rules into three-dimensional digital model files as soon as possible. This is also the most arduous and important part of information construction. And such a three-dimensional digital model is fully seamlessly integrated with upstream product design and downstream CNC programming.
Huazhong University of Science and Technology and Wuhan Kaimu Company engaged in the research of 3D process modeling earlier, and proposed Zhang Shengwen Huang Huaming. Marine mechanical parts classification coding system (CJLBM-1) secondary shape code design. Journal of East China Shipbuilding Institute, 1995 9(4)T1-77. Xie Feng Chai Xiuyun Shen Weilei. The design of the classification coding system for the parts of the revolving body Ji Weixi Liang Suqin. Computer aided reducer parts classification coding system. Journal of Jiangsu University of Science and Technology, 1995, 16(2) T5-58. Yang Jianbo. Computer Aided Process Design System (CAPP). The basic idea of ​​the CAPP prototype system of Yunnan University Journal is based on a three-dimensional product feature model. Firstly, the features of the parts are extracted and distinguished, that is, the feature recognition. Then, combined with the process resource library, the processing method is selected according to the characteristic parameters to determine the processing equipment and the amount of work. The processing process segments corresponding to the respective features are generated, and then the steps of the feature process segments are combined according to the clustering and sorting rules such as coarse and fine separation, minimum indexing, etc., and finally, according to the first and second, the first coarse, the fine, the first benchmark After the other sorting rules and sorting according to the company's production equipment and human resources and other conditions.
However, the author believes that this method is more suitable for the various processing features of the part in the rough finishing process for the same type of feature roughing shape and finishing, only the method of using the different parts with such processing characteristics can be used . However, if the structure and processing of the machined part are complicated, the amount of information in the J process is large. For example, after the finishing process is a round shaft, in the roughing process, it is reflected that the block blank is gradually milled into a square axis and then turned into a shape. If the process is slow, the drawing speed is not ideal.
Zhao Liangcai, who built a part operation diagram model for some machining processes, is more complicated. Computer-aided process design CAPP system design. Beijing Mechanical Industry Press, 1999. Du Fu Huang Naikang computer-aided process design principle. Beijing Beihang University, 990. (Editor Mao Liqing) process design and manufacturing, CNC technology.