1. High-speed, high-precision speed and precision are two important indicators of CNC machine tools, which are directly related to processing efficiency and product quality. At present, the numerical control system uses a processor with a higher number of bits and a higher frequency to increase the basic operation speed of the system.
At the same time, the use of ultra-large-scale integrated circuits and multi-microprocessor structures to improve the system’s data processing capabilities, that is, to improve the speed and accuracy of interpolation operations. In addition, the linear servo feed mode of the machine tool table is directly driven by a linear motor, and its high speed and dynamic response characteristics are quite superior. The use of feedforward control technology greatly reduces the tracking lag error, thereby improving the machining accuracy of corner cutting.
In order to meet the requirements of ultra-high-speed machining, the CNC machine tool adopts a structure that combines a spindle motor and a machine tool spindle into one, which realizes the integration of the frequency conversion motor and the machine tool spindle. The bearings of the spindle motor use magnetic bearings, hydrostatic bearings or ceramic rolling bearings, etc. form. At present, ceramic cutting tools and diamond-coated cutting tools have begun to be applied.
2. The CNC turning and milling compound processing plant introduces various machining centers equipped with automatic tool changers (the capacity of the tool magazine can reach more than 100), which can realize milling, boring and drilling at the same time on the same machine tool. , Turning, reaming, reaming, tapping and other processes, modern CNC machine tools also use multi-spindle, polyhedral cutting, that is, different parts of a part can be cut in different ways at the same time.
Because the CNC system adopts a multi-CPU structure and hierarchical interrupt control mode, it can perform part processing and programming on one machine tool at the same time, realizing the so-called “front-end processing, background editing”.
Analysis of CNC turning and milling complex processing plants, in order to meet the requirements of flexible manufacturing systems and computer integrated systems, the CNC system has a long-distance serial interface, and can even be networked to realize data communication between CNC machine tools, and it can also directly communicate with multiple CNC machine tools. Take control