3. Rigidity and accuracy retention of CNC machining center

Because the mold materials are hard, and the accuracy marked in the technical parameter description of the machining center is the technical parameter of the machining center under no load. The accuracy in the actual machining state is also related to the rigidity of the machining center and other factors. Therefore, special attention should be paid to the rigidity of machining centers for the mold industry. Rigidity is an important feature of the quality of machining centers, but there is no objective standard for evaluating the rigidity of machining centers at present. If necessary, choose machining centers with a size one file larger than the template size.

When choosing the machining center, we should also consider the accuracy retention of the machine tool. It is necessary to analyze the layout of the machine tool, the rigidity of the machine tool, the span of the guide rail, and the structural form; Cast iron material guide rail and concrete material bed should be preferred; The spindle shall be equipped with circulating cooling device, etc. The machining center with good rigidity and accuracy guarantee is after the "running in" of the machine tool The more you use it, the better. The author has seen many mold processing enterprises. Some of them have lost the accuracy of machine tools after a year or two because of the improper selection of machining centers and the large vibration and noise of machine tools in the processing process; Some machining centers have been used for ten years, and the accuracy of machine tools is still maintained.

4. Selection of CNC system

The grade of the selected CNC system should match the grade of the machining center. Because the program address of single process processing of mold surface can reach more than 1GB, and the processing time can reach more than dozens of hours, it is generally required that the mean time between failure (MTBF) of the CNC system is greater than 10000h, the calculation speed is fast, the storage capacity is greater than 1MB, the system fast forward speed is greater than 24m/min, the interpolation unit is small, the interpolation function is rich, the network communication ability is strong, the fault self-diagnosis function is strong, and it has the online diagnosis function, with AC drive unit. For example, the mold surface is complex, and the CNC system has the functions of forward-looking control of feed speed and NURBS surface interpolation.

Modern CNC system has many functions, some of which are basic functions and some of which are selective functions. The selection must be based on the specific purpose of the machining center. We should make a comprehensive analysis of the performance and price of the CNC system, which is neither complete nor omitted.

Mold NC machining uses CAM software for automatic programming, and the selection of NC system should also consider the data exchange with popular CAM software. The good thing is that CAM software can directly support the post-processing of the NC system. In the selection of multi-axis CNC systems, the matching of CAM software for multi-axis machining must be considered at the same time.

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