1. High speed and 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 adopts a processor with a higher number of digits and a higher frequency to improve the basic operation speed of the system.
At the same time, a super-large-scale integrated circuit and a multi-microprocessor structure are used to improve the data processing capability of the system, that is, to improve the speed and precision of interpolation operations. And the linear servo feeding mode of the linear motor directly driving the machine tool table is adopted, 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 the structure of the spindle motor and the machine tool spindle, which realizes the integration of the frequency conversion motor and the machine tool spindle. The bearing of the spindle motor adopts magnetic bearing, hydrodynamic and static pressure bearing or ceramic rolling bearing. form. At present, ceramic tools and diamond-coated tools have begun to be applied.
2. Introduction of CNC turning and milling compound processing factory, various types of multi-functional machining centers equipped with automatic tool changing mechanism (tool magazine capacity 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, polyhedron cutting, that is, different ways of cutting different parts of a part at the same time.
Due to the multi-CPU structure and hierarchical interrupt control method adopted in the numerical control system, parts processing and programming can be performed on one machine tool at the same time, realizing the so-called "processing in the foreground and editing in the background".According to the analysis of CNC turning and milling compound processing plant, in order to meet the requirements of flexible manufacturing system and computer integration system, the CNC system has a long-distance serial interface, and can even be networked to realize data communication between CNC machine tools, and can also directly communicate with multiple CNC machine tools. Take control.