Xxx Institute of xxx University is a research institute of xxxx, which mainly undertakes the research and development of xxxx in China. It has played an important role and made great contributions to the development of xxxx in China. At the same time, it also undertakes the important manufacturing task of xxxx. Due to the characteristics of the research direction, higher requirements are put forward for the machining level, especially for the machining of xxxxx mechanical parts, which not only ensures the mechanical accuracy, but also meets the design requirements for complex machining shapes. At present, our factory adopts CAXA-CAD/CAM system to realize the process design and processing of some complex parts. Second, the application of cam NC machining technology. The design of optical parts is generally required to meet the requirements of its optical path, so the shape will be more complicated, which is not the basic shape in traditional manufacturing. Sometimes the traditional milling, turning and planing can't meet the processing requirements. If wire cutting, EDM and other technologies are used, the requirements can be met, but the turnover process of the workpiece will increase, the production cycle will be extended, and the dimensional benchmark will change due to repeated clamping of the workpiece. There will also be some inevitable shortcomings. Using numerical control technology can not only shorten the production cycle, but also avoid repeated clamping and improve the machining accuracy.

For the programming of CNC machine tools, the traditional manual programming method is that programmers calculate and write G code programs according to the requirements of two-dimensional drawings and certain processing routes, and then input them into the machine tool for processing. However, for complex parts, if three-dimensional programming is needed, manual programming is difficult to complete. Using appropriate CAM software instead of manual programming, the computer will automatically process the part drawing. Programmers only need to input relevant parameters and requirements, and they can automatically generate machining G codes. At the same time, for parametric surfaces and complex free-form surfaces that cannot be calculated by manual programming, machining programs can also be generated by processing three-dimensional graphics drawn by computers. According to relevant statistics, the ratio of the programming time of manually programming a part to the actual processing time of the machine tool is 30: 1. If you use CAM software to program, it will effectively save time, improve the machining accuracy and the ability to process complex parts. Third, the process based on CAXA manufacturing engineer CAXA manufacturing engineer, as a domestic CAD/CAM software with curved solid, has flexible solid surface modeling function and rich data interface, and can realize complex three-dimensional modeling design of parts. Through the post-processing setting of processing parameters, the parts to be processed are selected, and the appropriate NC system processing code is automatically generated. The processing technology and code quality are checked through intuitive processing anti-counterfeiting and code reverse reading. For complex parts, CNC technology and CNC machine tools are needed for process analysis and machining, including the traditional manual programming process and the basic application process of CAXA-CAD/CAM system with CAXA manufacturing engineer as the core. 1. Receiving processing tasks receive 2D or 3D drawings and floppy disks from the laboratory to complete the 3D data model that meets the needs of numerical control processing. Take the simple part of figure 1 as an example, which is the solid modeling after three-dimensional modeling according to the two-dimensional design blueprint. CAXA- CAD can use plane drawing functions such as straight line, arc and spline, and solid modeling functions such as drawing, blanking, lofting and scanning to process and mix design elements and model 3D processing data. The output of laboratory design is generally in the form of two-dimensional drawings, and there are also three-dimensional CAD designs. According to the different characteristics of CAD engineering design software in various laboratory departments, CAXA-ME needs rich data interfaces. CAXA manufacturing engineers include DXF and IGES standard graphic interfaces based on surfaces, X-T and X-B based on entities, STL for rapid prototyping equipment, surface INTERNET and VRML for virtual reality. The two-way data exchange with CAD software is ensured, and the production in the factory and the design and development of the laboratory can be exchanged smoothly. In the process of part modeling, you can directly use the three-dimensional design provided by the design, or use elements such as parameter lines in two-dimensional drawings to introduce CAXA modeling to realize the accurate exchange of CAD data. 2. Determine the processing scheme and analyze the three-dimensional modeling. According to the necessary heat treatment specifications of the previous working procedure, the next working procedure and the intermediate insertion, determine the size of the parts to be processed and whether it is necessary to re-clamp in the middle of processing to meet the heat treatment requirements. Firstly, the process analysis of solid modeling is carried out, and the supplementary modeling is modified according to the process characteristics. According to the machining characteristics and machining ability, determine the three-dimensional solid surface to be machined, as shown in Figure 3. Then analyze the composition of the entity and determine the processing steps. At the same time, the determination of processing technology also includes the approval of technical requirements such as part size and tolerance, the determination of clamping mode, the selection of tools, the adjustment of machine tools and the setting of parameters. According to the workload, decide whether DNC online G code transmission is needed. 3. Generating machining trajectory According to the shape characteristics and technological requirements of the parts to be machined, the solid parts to be machined are flexibly selected by using advanced machining methods such as curved surface, guidance, parametric line and projection provided by CAXA manufacturing engineers. , input relevant data parameters and requirements, and quickly generate tool path and tool cutting path. CAXA manufacturing engineers can also use the knowledge processing function to select typical processing routes, and use others' practical experience to accumulate their own processing experience in the long-term processing process, so as to make the preparation of processing trajectories more simple and reliable. 4.g code generation After the machining trajectory is generated, the machining G code needs to be generated from the machining trajectory, but the numerical control systems of different machine tools are different. At present, the typical numerical control systems popular in the world are FUNUC in Japan, Siemens in Germany, ACRAMATIC in the United States, FAGOR in Spain, Mitsubishi in Japan, NUM in France, HEIDENHAIN in Germany and so on. Different CNC systems have different G-code functions, so the format of machining programs is also different. With the post-processing function, some settings can be modified to meet the requirements of various commonly used machine tool numerical control systems, and can also be customized according to the specified format of machine tools. After customization, you can save the settings for future matching with such machine tools. After the G code is generated, the machining program sheet can be generated as needed, and the program will automatically calculate the machining time of each machining step according to the parameters in the machining trajectory preparation. This is helpful to determine production management and calculate processing time. 5.g code transmission and G code generated by machine tool processing should be transmitted to the machine tool. If the program volume is small and the memory capacity of the machine tool allows, the G code program can be transmitted to the machine tool at one time. If the amount of programs is huge, DNC needs to be transmitted online, and the G code is directly connected with the machine tool through the computer standard interface, so that the computer can directly control the machining process of the machine tool without occupying the memory of the machine tool system.

According to the received G code processing program, the machine tool carries out online DNC processing or independent processing. Three. Due to the country's emphasis on manufacturing industry and the rapid development of China's space industry, the precision machining level in China has also been improved to some extent. I undertake the research and manufacturing tasks of several national aerospace engineering projects. CAXA, a domestic CAM software used in the factory, has made great progress in NC machining technology, brought into full play the advantages of the original NC machine tools, improved the utilization efficiency and developed other functions of NC machining. It provides a more powerful guarantee for the processing of complex engineering parts in the future, and also broadens the way for us to further improve the level of precision machining technology in the future. I hope you are satisfied.