Throughout the development of machine tool numerical control systems, Japan and Europe and the United States have always led the development trend of numerical control systems. From the 3 systems that FANUC cooperates with Siemens, the 0 series produced by FANUC and the 8 systems manufactured by Siemens have occupied most of the market of machine tool manufacturing. Compared with the development speed of foreign countries, the development of domestic CNC systems is not slow, especially after the baptism of the financial crisis, the product structure of domestic machine tool manufacturers has been further optimized, and the development of domestic CNC systems has also accelerated. “But in the high-end machine tool market, the proportion of our domestic CNC products is very low. Most of the products are concentrated in the middle and low-end.†Sheng Bohao, deputy chief engineer of the Beijing Machine Tool Research Institute, said in an interview. At the same time, the domestic CNC system has not yet established its own brand effect, and users also seem to have insufficient confidence.
However, in recent years, some excellent domestic machine tools and CNC system manufacturing companies have sprung up. In the highly competitive market of mid-range machine tools, the market share of domestic CNC systems has increased year by year. Sheng believes that the domestic CNC system is expected to stand out because of its price advantage and the support of relevant national policies.
“A few years ago, the reliability of domestically produced CNC products was not very satisfactory. Most of the problems were concentrated on the shortcomings of poor electromagnetic compatibility. Although this situation has been greatly improved, it is still done in terms of reliability. It is not as good as foreign products. Therefore, domestic products must pay attention to reliability as an important indicator while improving technology." - Sheng Bohao
Reliability - the index that the CNC system should focus on
At present, the research and development of domestic CNC machine tools is mainly for the high-end market, and the machine tools with high-speed, high-precision and multi-axis linkage combined processing functions are gradually favored by the industry. However, with the increase of composite functions, unreliable factors and hidden troubles also increase, and the probability of failure during machine operation and use is greatly increased. Mr. Sheng said: "Because of the intensive combination of high-end CNC equipment, large size, complex structure, and variable processing conditions, reliability issues have also plagued domestic high-end CNC machine tool manufacturers."
As one of the important parameters to measure the reliability of CNC machine tools, Mean Time Between Failure (MTBF) is a parameter that CNC machine tool manufacturers pay more attention to. Sheng said that from the perspective of the CNC system, the MTBF of domestic products can reach more than 10,000 hours, up to 20,000 hours. The MTBF of the CNC system produced by foreign advanced enterprises can reach 80,000 hours. The gap of this parameter also reflects the rising space of the domestic CNC system.
“National CNC system manufacturers should tilt the focus of R&D to reliability, and the full-featured and reliable products are the most needed for customers.†Sheng recommended.
"In the future, the CNC system will have to bear more 'responsibility', such as the realization of various compensation functions, the interconnection of buses and the promotion of enterprise information. In addition, speed compensation and temperature compensation will be further optimized, and offline compensation will also be online. Compensation development. At the same time, the system software that is compatible with the five-axis linkage technology is also a key concern for domestic enterprises." - Sheng Bohao
Intelligent - CNC system has to bear more "responsibility"
High-speed, high-precision, compound and intelligent have always been the development trend of CNC machine tools, and intelligentization is precisely the premise of achieving high-speed, high-precision and compounding. The rapid development of domestic automobile, shipbuilding, aviation and other industries also puts forward the performance of numerical control system. Higher requirements.
Mr. Sheng introduced that intelligent machine tools can make judgments and decisions on the manufacturing process, and can monitor, diagnose and correct various deviations in the production process, which involves compensation technology, fieldbus technology and so on. Specifically, first of all, the adaptive control technology should have mature application. The numerical control system can detect important information in the operation process, automatically adjust the system parameters, improve the system operation status, establish an expert system with artificial intelligence, and introduce the fault diagnosis expert system. In this way, the general rules of the process can be stored in the system, and the support of the process parameter database can be obtained, and the probability of occurrence of the fault can be reduced; the intelligent digital servo drive device is adopted in the servo device, so that the load can be automatically recognized. And adjust the parameters to get the best operating state of the drive system.
In addition, Sheng also mentioned that the development of five-axis linkage technology in China is in the mature stage. Because of the five-axis linkage, the three-dimensional surface parts can be cut with the best geometry, so the efficiency is higher than the three-axis linkage processing. a lot of. However, due to the complicated structure of the linkage CNC system and the host system, the corresponding system software is also very complicated. Most domestic CNC machine tool manufacturers rely on imported software from some countries such as Germany for a long time. This aspect increases the total cost of machine tools and also restricts the development of domestic machine tool enterprises. Sheng always suggested that domestic CNC machine tools enterprises should not neglect the development of system software while improving the hardware level.
"As an important functional component of the CNC system, the performance of the servo motor directly affects the performance of the CNC system. Most of the servo motors used by domestic CNC system manufacturers come from well-known foreign companies. If the market is deep in the servo motor market, I I feel that the development of the domestic CNC system will go even further." - Sheng Bohao
Servo motor - domestic CNC system manufacturers need to carry out deep ploughing
Servo motor is an important part of machine tool numerical control system. AC servo system has also replaced DC servo system in a wide range. At the same time, software control has gradually replaced hardware control, which has become the development trend of servo technology. At present, most domestic CNC system manufacturers still need to import servo motors, which undoubtedly increases the cost of machine tool numerical control systems. Sheng said that the servo system is responsible for the feedback signal, and the performance directly determines the overall quality of the CNC system.
As for the current status of the use of motors in domestic CNC systems, Sheng believes that if the functional component industry does not form a large-scale development, the reliability and price of CNC products and the quality of machine tools will not improve. At present, relevant policies have also been introduced in China, emphasizing market demand-oriented, focusing on CNC terminal products, driving the development of CNC industry with the whole machine, and focusing on solving the reliability and production scale of CNC systems and related functional components. Therefore, the servo motor is an important functional component of the numerical control system, and its development is inevitably further promoted. In terms of technology, the proportion of linear motor drives will become larger and larger, so the application of linear motor drives on high-speed, high-precision machine tools has entered an accelerated period of growth. Mr. Sheng concluded: "The domestic CNC system manufacturing enterprises should be in line with the policy and lead in technology, so that the functional components of the domestic machine tool numerical control system can be further developed. At the same time, it will also play a great role in the domestic machine tool manufacturing industry. Promote."
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