With the electronic technology and automation technology, numerical control technology more widely. To microprocessor-based, marked by large-scale integrated circuits NC equipment, has been mass production in China, a large number of the introduction and popularization and application, and they to the mechanical manufacturing industry has created conditions, and bring great benefits. But at the same time, due to their advanced nature, complexity and high intelligence, in the maintenance of theory, technology and means to have taken place on leap changes.
CNC maintenance technology is not only a prerequisite for the protection of the normal operation of the CNC technology development and improvement have also played a tremendous role in promoting, Therefore, at present, it has become a specialized subjects.
In addition any numerical control equipment is a process control equipment, which requires real-time control in every moment of the accuracy of work. Any part of the fault and failure, it will enable the machine tool downtime, resulting in the production of a standstill. Thus the principle of numerical control system so complex, structural maintenance of sophisticated devices it is very necessary. In particular, the introduction of CNC machine tools, most of them spent hundreds of thousands to tens of millions of dollars. In many industries, these devices are at a critical jobs, if not after the failure of timely maintenance troubleshooting, will result in greater economic losses.
Maintenance of our current situation and the level of imported equipment and the design and manufacture of technical level there is still a big gap. Of the underlying reasons are: poor quality of personnel, lack of analysis of digital test instruments, the number of domain and several domain and frequency domain analysis of integrated testing technology needs to be improved and so on.
Here we have a modern CNC system constitutes the basic starting point to explore the numerical control system diagnosis and repair.
At present, the world's NC system wide variety of different forms, the composition of the structure has its own characteristics. These structural features from the system, the basic requirements for initial design and engineering design ideas. For example, point to point control system and continuous control systems have different trajectory requirements. The T system and the M system, but also there was a great difference, the former applies to Rotary Parts processing, which is suitable for special-shaped non-rotating body parts processing. For example different manufacturers, based on the historical development as well as their respective vary the complexity of factors, may also be thinking in the design is different. For example, the United States Dynapath system uses a small plate structure, easy and flexible combination of the replacement board, while Japan FANUC system tended large panel structure to facilitate the work of the reliability of the system to system MTBF rate rising. Whatever the system, however, they constitute the basic principles and is very similar. General throughout the numerical control system has three major components, namely, control system, servo system and position measuring system. Control System workpiece by computing interpolation procedures, issued instructions to the servo drive control system; servo drive system will control orders amplification, by servo motor-driven machinery required movement; measurement system detects the movement mechanical position or velocity, and feedback to the control system, to amend the control orders. Organic combination of the three-part form the complete closed-loop control of the NC system.
