Since the beginning of the 21st century, China's economy has been fully integrated with the world, and has entered a new period of vigorous development. The machine tool manufacturing industry is facing both the manufacturing needs of machining equipment caused by the development of the machinery manufacturing industry, and the fierce international market after joining the World Trade Organization. The needs of market competition make accelerating the development of CNC machine tools a key to solving the continuous development of the machine tool manufacturing industry. With the large demand for CNC machine tools in the manufacturing industry, as well as the advancement of computer technology and modern design technology, the application of CNC machine tools needs to be continuously expanded and developed to meet the needs of production and processing.

High precision

Taking the machining center as an example, its main accuracy indicators, the positioning accuracy of linear coordinates and the repeated positioning accuracy, have been significantly improved. 1nm. In order to improve the machining accuracy, in addition to the use of low thermal expansion coefficient materials and constant temperature oil in the overall design of the structure, the headstock, and the feed system, the measures taken in the control system are:

• Adopt high-precision pulse equivalent. Start with improving control to improve positioning accuracy and repeatable positioning accuracy.

• AC digital servo system is adopted. The quality of the servo system is directly related to the machining accuracy of the CNC system. Using the AC digital servo system can digitize the position, speed and current loop of the servo motor and other parameters, thus realizing a high-speed response servo system that is almost unaffected by load changes.

• Feedforward control. The so-called feedforward control is to add the control of each order derivative of the command to the original control system. Adopting it can make the tracking of the servo system lag by 1/2 and improve the machining accuracy.

• Non-linear control of static friction of machine tools. For CNC equipment with large static friction, the roundness of arc cutting is not good due to the lack of effective control in the past. The new digital servo system has the nonlinear control function of compensating the static friction of the machine tool drive system, which can improve the roundness of the arc.

High reliability

The reliability of CNC system work has always been an important indicator that people often pay attention to. In order to improve the reliability of the numerical control system, the following measures have been taken.

• Improve the hardware quality of the CNC system. Select high-quality integrated circuit chips, printed circuit boards and other components, establish and implement a series of complete quality assurance systems from component selection, stable product manufacturing and assembly processes, and performance testing.

The latest numerical control system, such as Japan's FANUC16 system, adopts three-dimensional plug-in technology. Compared with the plane high-density plug-in technology, it further improves the plug-in density of electronic parts on the printed circuit board, making the control device more miniaturized. The typical hardware is integrated and made into a dedicated chip, which provides a guarantee for improving the reliability of the system.

• Modularization, standardization and generalization. The performance of the modern numerical control system is becoming more and more perfect, and the functions are more and more abundant, which makes the hardware and software structure of the system realize modularization, standardization and generalization. The realization of the three modernizations not only facilitates the organization of development, production and application, but also improves the reliability of production and operation, and facilitates the user's repair and maintenance.

Infiltrating the principles of standardization, serialization and generalization into the new product design work that can maximize the standardization level of the product production process, so that the new product can meet the market demand in the fastest and easiest way. This not only meets the needs of users promptly, but also reasonably develops product varieties, simplifies process tooling, and improves product competitiveness.

Conclusion

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