In order to accomplish this task, we must first establish a development path that conforms to China's national conditions. Therefore, this paper discusses the development path of the new century from two aspects: overall strategy and technical route, as well as numerical control system, functional components and numerical control machine tools.
The overall strategy of 1
It is very important for the development of numerical control technology and industry in China in 2 1 century to formulate the overall development strategy in line with China's national conditions. Through the analysis of the development trend of numerical control technology and industry, and the research on the problems existing in the field of numerical control in China, we believe that the overall strategy of developing numerical control technology and industry in line with China's national conditions will be to take scientific and technological innovation as the guide, commercialization as the main task, management and marketing as the focus, and technical support and service as the backing.
1. 1 oriented by scientific and technological innovation.
After more than 40 years' development, China's numerical control technology and industry have made great progress from scratch, from introducing and digesting to having its own independent copyright. But looking back on the development of these decades, we can see that our progress in the field of numerical control is mainly based on some foreign models and developed step by step, and there are not many truly innovative components. This situation is understandable in the early stage of development. However, in the new century when the world's numerical control experts are like Lin, and the knowledge economy is about to enter the stage, this conventional approach is difficult to work. For example, when the analog servo abroad is going out of date, we started to engage in analog servo, but the market has not stabilized and the technology has fallen behind; When pulse-driven digital servo was introduced into China market abroad, we also followed this so-called digital servo, but it has not formed a large market scale so far; Recently, when developing digital servo abroad, it is connected with numerical control equipment through network (through optical cable, etc.). ), we also follow the trend to develop such a system, and the future is still not optimistic. Always behind others, it is inevitable to develop domestic CNC system according to the existing control and drive mode abroad. In addition, foreign companies set up research institutes and production plants in China, and carry out local development, local production and local sales, which makes our products less and less advantageous in terms of cost performance. Therefore, it is naturally very difficult to further expand market share.
In order to change this situation, we must deeply understand and conscientiously implement the great assertion that "science and technology are the primary productive forces", vigorously strengthen scientific and technological innovation in the field of numerical control, strive to study practical advanced numerical control technology with China characteristics, and gradually establish our own independent advanced technology system. On this basis, we will vigorously develop CNC products in line with China's national conditions, thus forming a complete industrial system from CNC systems, CNC functional components to a full range of CNC machine tools. In this way, we will not be led by foreign countries and restricted by others forever, and it is possible to recover the domestic market and open the international market with advanced and practical CNC products, so that China's CNC technology and CNC industry will be at the forefront of the world in 2 1 century.
1.2 Work hard on commercialization.
Although China's numerical control products have developed rapidly in recent years, there are not many really standing in the market. As far as numerical control system is concerned, domestic products have not really been accepted by the vast number of machine tool factories, so there are many examples of domestic numerical control systems used in the transformation of old machine tools, but they are rarely used in new machine tools. Most of the domestic CNC machine tools produced by machine tool factory adopt foreign systems. Of course, this does not mean that the numerical control transformation of old machine tools is not important, but that there is still a considerable gap between our numerical control system and foreign countries from the perspective of goods.
In addition to technical performance and function, reliability, stability and practicality are the main factors affecting the commercialization of CNC systems and CNC machine tools. In the past, some R&D departments of CNC technology and products often pursued some technical indicators (such as how many channels, how many axes are linked, how many meters per minute feed rate, etc.). ), but pay little attention to some indicators and some small problems that affect practicality, and spend relatively little energy on product stability, robustness, reliability and practicality. Therefore, some products are highly appraised and even won various awards. However, these high-index and high-performance products, because of some minor problems, were unsatisfactory, and finally lost their credibility and could not open the market. This shows that the prototype product with high index and high performance is far from the practical and reliable product that users really need, and it still needs a lot of efforts to turn a product with high index and high performance into a marketable product.
On the other hand, CNC systems and CNC machine tools are not as easy to mass-produce as household appliances, and the application environment is not so simple. When CNC products are used in production environment, they are faced with various technical problems. If the development department can't grasp these problems thoroughly, it will be difficult to design the products perfectly. Moreover, some problems of CNC products are difficult to find in development, trial and even identification. Therefore, the same type of CNC machine tools run well in some users, but not well in others. Or the same type of CNC machine tools have a good processing effect on some parts, but the processing of other parts is not satisfactory. This situation is sometimes caused by the user's operator level, but sometimes it is the exposure of potential problems of CNC products themselves. In order to solve this problem, some foreign companies set up special institutions to test their products. For example, in order to test the newly developed CNC system, manufacturers have collected a large number of parts programs from production practice, and let the CNC system run various programs. Once problems are found, they will immediately feed back to the development department to solve them. After such a test process, the potential problems of CNC system are greatly reduced. In the past, our products rarely passed such strict and comprehensive self-inspection. Many questions have to be picked out by users. In this way, even a small problem will seriously affect the reputation of domestic CNC products.
Therefore, we should pay full attention to the above problems, make great efforts in commercialization, and regard it as the backbone of the numerical control industry, which runs through the whole process of technical research, product development, trial production and production, so that our existing numerical control products with high technical level can become good goods with real market.
1.3 focusing on management and marketing.
After nearly 20 years of market turmoil, Chinese people have realized more and more that technology is important, but in the market economy environment, management and marketing are more important in order to win in the fierce global competition. For example, CNC machine tools produced in Taiwan Province Province not only occupy a considerable share of the mainland market, but also enter the American market. Is the technology and quality of CNC machine tools in Taiwan Province Province superior to that in the United States? Obviously not. Then what do they rely on? It is important to work hard on enterprise management and product marketing. However, for a long time, we have been focusing on developing technology and improving the level, while ignoring management, market development and product marketing. As a result, enterprises are still in the dilemma of poor product sales after the development of new technologies and new products and the improvement of product quality [1]. Experience at home and abroad shows that the competitiveness of CNC products depends not only on technology, but also on management and marketing capabilities.
Therefore, from now on, we should take management and marketing as the focus of industrial development, truly get rid of the shackles of thinking patterns and work habits left over from the planned economy era, and establish an efficient and sensitive operation mechanism and an effective incentive mechanism to adapt to the market. Through this mechanism, on the one hand, strengthen enterprise management, stimulate the responsible spirit, creative spirit and dedication of enterprise leaders and employees, and strive to improve the competitiveness of products; On the other hand, fully mobilize all positive factors inside and outside enterprises and industries, vigorously strengthen market development and strive to open up marketing channels. We can firmly believe that products with excellent competitiveness, coupled with the spirit of "seeking, earning, drilling and grabbing" like Beijing Kai Guanchang, will definitely win in the market competition.
1.4 Vigorously strengthen technical support and services.
As typical high-tech products, CNC system and CNC machine tools are very important for users' technical support and service. In the past, the reason for the loss of credibility of domestic CNC products was the lack of strong technical support and service besides reliability. Users spend a lot of money to buy CNC machine tools or CNC systems, but once there is a problem, it is invalid to call it no every day. Who dares to buy our products in the future? Therefore, technical support and service to users should be regarded as an important daily work, so that we can have a strong rear when the market goes deeper. Therefore, in order to win the overall market competition of CNC products, we must establish a strong rear with technical support and service as the core. Of course, in order to win the initiative, the rear must also take the initiative. At present, the use of advanced information technology means (such as network and multimedia) will open up a new way for establishing a new generation of three-dimensional technical support and service system.
1.5 stick to the road of sustainable development
Sustainable development is an important strategy for the development of enterprises in the next century. If China's numerical control industry wants to develop greatly, it must adhere to the road of sustainable development. Green is an important way to realize sustainable development, and its main idea is cleanliness and economy. Therefore, we should vigorously strengthen the development of green CNC products and speed up the greening of CNC products, CNC industry and the whole manufacturing industry. The main strategic measures should consider the following aspects: ① Effectively reduce the environmental pollution in the process of product manufacturing and use. Such as reducing the casting structure of CNC machine tools and eliminating environmental pollution caused by casting; In order to reduce the pollution to the production environment, oil-gas lubrication and oil injection lubrication are used instead of oil mist lubrication for the spindle of CNC machine tools. Cancel the freon refrigeration constant temperature technology in the temperature control of precision CNC machine tools and their operating environment; Replace mechanical transmission with electric transmission to reduce noise pollution. ② Greatly reduce resource consumption and energy consumption. If hardware is replaced by software, the consumption and pollution of resources and energy in hardware manufacturing will be reduced, and the problem of disassembly and recycling of hardware equipment after the end of product life will be reduced; Permanent magnet drive is used instead of induction drive to improve efficiency and power factor and save energy; Using electric drive instead of mechanical drive can improve efficiency and reduce energy consumption. ③ Strengthen the transformation of traditional machine tools with numerical control technology. This is not only in line with the application of information technology and automation technology to transform traditional industries and realize the goal of sustainable development of traditional industries, but also can achieve huge economic benefits. There are millions of ordinary machine tools in China, and strengthening the transformation of traditional machine tools with numerical control technology will become an important development direction in the field of numerical control in China in the next century. ④ Vigorously develop green CNC machine tools. Green CNC machine tool should be a new machine tool with less material consumption, low energy consumption, no pollution, long service life and easy disassembly and recycling. For example, replacing series structure with parallel structure is a way to develop green CNC machine tools, because the metal material consumed by parallel structure machine tools is only a fraction of that of conventional series structure machine tools, and its processing capacity is greatly reduced compared with conventional machine tools, especially the casting of large structural parts is cancelled, which will significantly reduce the energy consumption and environmental pollution in the machine tool manufacturing process. In addition, the parallel machine tool is conducive to the use of electric drive, high efficiency, and can effectively reduce energy consumption in use.
ISO 14000 environmental management standard has been formulated by the International Organization for Standardization, and the trend of "legalization" of global environmental problems has further developed, and sustainable development will become a passport for enterprises to enter the international market [2]. Therefore, if our CNC products are to enter the international market in the next century, our enterprises must "start from me, start from now".
2 technical methods
2. 1 develop a new generation of PC numerical control system with China characteristics.
Numerical control system is the core of all kinds of numerical control equipment. Through scientific and technological innovation, it will be an effective technical way to promote the process of numerical control industrialization to first develop a new numerical control system with China characteristics.
Practice has proved that the PC numerical control road we have taken since 10 is completely correct. PC (including industrial PC) has large output, low price, rapid technological progress and performance improvement, and high reliability (MTBF of industrial PC mainframe has reached 30 years [3]). Therefore, using it as the software and hardware platform of CNC system can not only greatly improve the cost performance of CNC system, but also make full use of the existing software and hardware resources of general microcomputers and share the latest achievements in the computer field, such as large-capacity memory, high-resolution color display, multimedia information exchange and networking communication. In addition, by using a general microcomputer as a numerical control platform, rapid technological progress can be achieved. After the PC is upgraded, the numerical control system can also be upgraded accordingly, so as to maintain the technical advantage for a long time and be invincible in the competition.
At present, the architecture of PC numerical control system mainly has two forms: (1) the composite structure of special numerical control and PC front end; (2) The hierarchical structure of general PC position control card. There is also a developing digital distributed structure. The scheme is to connect the digital servo composed of DSP with the numerical control device through the network with optical cable as the medium to form a complete numerical control system. Although this system has good performance, it is difficult to be accepted by domestic users in the near future because of the high development and production costs. In our opinion, the above-mentioned structure is not the best scheme in line with China's national conditions, but the integrated structure with all numerical control functions completely software is suitable for China's national conditions, because the hardware scale of this structure is the smallest, which not only helps to reduce the system cost, but also effectively improves the system reliability.
Decades of experience show that reliability is the key to the development of domestic CNC system. Although there are many factors that affect the reliability of CNC system, excessive hardware scale and low hardware manufacturing technology often pose the greatest threat to reliability. In the past, due to various reasons, domestic CNC systems had to choose ordinary CPU with low technical index. In this way, in order to complete the complex functions of CNC system, it is often necessary to form a system by multiple CPUs, and sometimes it is necessary to add some special or general hardware circuits to realize some real-time functions of CNC system (such as fine interpolation, position servo control, etc.). ), resulting in a huge scale of system hardware. Under the existing technical conditions in China, it is difficult to ensure the reliability of the CNC system from the perspective of hardware manufacturing, which makes the domestic CNC system perform poorly in the production site, seriously affecting the image and reputation of the domestic CNC system, and leaving many users still worried.
Therefore, when developing a new numerical control system, new high-performance CPU (such as Pentium II and Pentium III with high frequency) should be given priority as the operation and control core of the system, and all functions of numerical control should be realized by software as far as possible. In this way, the scale of system hardware can be greatly reduced. In addition, the design and manufacturing technology with strong anti-interference and high reliability should be adopted in software design, power supply design, connector design and selection, grounding and shielding design and construction, so as to improve the reliability of the system in an all-round way.
Because a new type of high-performance CPU can replace dozens of ordinary CPUs (such as 80286 and 80386), not only the basic functions of numerical control system (such as information processing, tool compensation calculation, interpolation calculation, acceleration and deceleration control, etc.) and switch control function (built-in PLC) can be completed on the PC platform based on high-performance CPU, but also the servo control function can be completed. In this way, digital servo control functions (such as position control, speed control, vector transformation control, etc. ) What was previously done by DSP can be done by CPU in PC, so as to realize the built-in servo control, which not only effectively reduces the hardware scale of NC part, but also greatly reduces the hardware scale of servo control part.
The hardware scale of this fully software integrated CNC system with built-in PLC and built-in servo control will be minimized. In addition to a PC platform, the whole CNC system only has a power interface and a feedback interface to drive the machine tool to move. This not only effectively improves the reliability of the system, but also eliminates the bottleneck of information transmission, improves the performance of the system, and significantly reduces the cost of the system, so that the price of the system (including the motor) will be reduced to about half of the existing CNC system. Obviously, this new numerical control system with high performance, high reliability and low cost will be very competitive, and it is expected to make contributions to creating a new situation of numerical control in China.
In addition, the integrated PC numerical control system has a great advantage, that is, it is easy to realize the open structure. This is because the hardware of the system itself is completely open, and the work that constitutes the open CNC system is completely in the software. As long as the standards and protocols are formulated, information processing, trajectory interpolation, acceleration and deceleration control, on-off control and servo control can be realized, which greatly facilitates the use of users.
2.2 Promote the professional production of CNC functional parts
After solving the problem of CNC system, how to realize the modular design and manufacture of CNC machine tools is another key for China machine tool manufacturing enterprises to quickly respond to market demand and win in the competition. To realize modular design and manufacture of CNC machine tools, it is necessary to solve the problem of specialized production of functional parts of CNC machine tools. At present, there is still a considerable gap between China and the actual demand in this respect. Therefore, in the next few years, we must vigorously promote the development and professional production of functional parts of CNC machine tools. The main points are as follows:
(1) The new permanent magnet motorized spindle unit motorized spindle has become the most popular functional component of CNC machine tools in the international market. However, at present, almost all of these products are induction asynchronous, and there are the following outstanding problems: ① There are windings on the rotor, and a large current flows through it, and the rotor is seriously heated, which directly affects the accuracy of the spindle; ② The low-speed output is small and the torque ripple is large, so it is difficult to meet the requirements of large-scale cutting; (3) Low efficiency and power factor require not only large motor size and weight, but also large inverter capacity and energy consumption; ④ The control system is complicated and the cost is high.
Therefore, using the advantages of rare earth permanent magnet materials in China to develop a new type of permanent magnet synchronous AC motorized spindle unit with high power, high efficiency and wide speed range will effectively solve the problems existing in the existing motorized spindle and form a new generation of motorized spindle products with China characteristics. Because the mechanical structure and control system of permanent magnet motorized spindle are simpler than induction asynchronous motorized spindle, it is easy to carry out specialized mass production. Of course, key technologies such as spindle support (ceramic bearing, hydrodynamic bearing and magnetic bearing), high-precision and high-speed dynamic balance technology, high-speed driving, detection and control technology, high reliability and safety guarantee technology need to be overcome.
(2) Cheap high-performance servo system At present, the price of a set of feed AC servo system (driver+motor) is generally more than 10,000 yuan, and the price of spindle servo system is as high as tens of thousands of yuan, which has become a major obstacle to reducing the cost of domestic CNC machine tools. Therefore, we should cooperate with the development of new integrated domestic CNC system and vigorously develop low-cost and high-performance embedded servo system. Because the hardware part of the built-in servo only has the motor and power interface, we can make full use of the advantages of permanent magnet resources in China, and the cost of the motor can be reduced through specialized production. It is also very cheap to use intelligent IPM module as the power interface, so the price of the built-in feed servo can be controlled within several thousand yuan and the price of the built-in spindle servo can be controlled within 20 thousand yuan.
(3) Linear AC servo system Linear AC servo system is an indispensable functional component of CNC machine tools in the next century. At present, there are no mature products in China, so it is necessary to strengthen research and development and application. Considering that the anti-magnetic problem of conventional machine tools is difficult to solve, and the anti-magnetic problem of parallel machine tools is relatively easy, we can develop the induction asynchronous linear motor of conventional machine tools and the permanent magnet synchronous linear motor of parallel machine tools, and form a new high-speed and high-precision feed system that meets the practical application requirements. On this basis, we can further develop the magnetic suspension worktable which integrates driving and supporting.
(4) Zero-drive CNC turntable and swing head CNC turntable and swing head are the key components of multi-coordinate CNC machine tools. The traditional turntable and swing head driven by high-precision worm and worm gear are not only difficult to manufacture and expensive, but also difficult to achieve the speed and accuracy required for high-speed machining. Therefore, it is necessary to find another way to develop a new type of zero-drive CNC turntable and swing head to promote the development of high-speed and high-precision multi-coordinate CNC machine tools in China.
(5) The high-speed and high-precision detection device is the theme of the development of CNC machine tools in the next century, which requires not only high-performance control and drive, but also high-quality detection links. Therefore, on the basis of the existing technology, it is necessary to further develop high-speed (more than 60 m/min) linear displacement sensors with accuracy of 0. 1 micron and angular displacement sensors with accuracy of 1 10,000 pulses /r, which are blocked abroad.
2.3 Accelerate the overall localization of CNC machine tools and make a good market turnaround.
The ultimate success of NC industrialization will be reflected in the complete localization and market share of NC machine tools. Under the guidance of the above overall strategy, it will be an effective tactic and strategy to quickly recover the lost ground in the domestic market, steadily enter the international market, and finally win the domestic CNC machine tool market. There have been many articles devoted to the development of ordinary CNC machine tools. Here, we will discuss the development of low-cost CNC machine tools, high-speed and efficient CNC machine tools and heavy CNC machine tools.
(1) Vigorously develop low-cost CNC machine tools. Low-cost CNC machine tools are popular CNC machine tools with functions that meet the requirements of users (without wasting functions), moderate technical indicators, good reliability and low price. This kind of machine tool has become one of the development trends of CNC machine tools in the international market, and it is also a product that many domestic users are eager for, and the market prospect is quite broad. However, if we develop low-priced machine tools with foreign numerical control systems (including servo) according to the traditional thinking, it is difficult to reduce the price to a level acceptable to the majority of users. Therefore, adopting the new integrated domestic CNC system proposed in this paper will be the most promising way to develop high-performance and low-cost CNC machine tools. As long as there are certain batches, the price of popular CNC lathes in China can be controlled within 6,543,800 yuan, that of three-coordinate CNC milling machines can be controlled around 6,543,800 yuan and that of machining centers can be controlled around 200,000 yuan. Domestic CNC machine tools at this price will be very competitive.
(2) Accelerating the development of high-speed and efficient CNC machine tools is another major trend in the development of CNC machine tools. There are several technical ways to develop high-speed and high-efficiency CNC machine tools: ① By increasing cutting speed and feed speed, the production efficiency is doubled, the surface machining quality and machining accuracy of parts are effectively improved, and the high-efficiency machining problems of some special materials (such as aluminum-titanium alloy, die steel and quenched steel) and parts with special shapes (such as complex thin-walled parts) that are difficult to solve in conventional machining are solved. (2) Through process combination, the installation times of workpieces are reduced, and the handling and clamping time is effectively shortened. If the five-face five-axis machining center and vertical lathe are combined into a universal machining center, most (or all) of the parts can be machined at one time. ③ New machining methods such as high-speed and high-precision circular milling for machining holes, spiral trajectory interpolation and direct tapping without drilling bottom holes are adopted, which greatly reduces the number of tool changes and improves the machining efficiency. (4) Develop the intelligent positioning processing function of CNC machine tools, eliminate the dependence on precision fixture and manual alignment, and effectively shorten the preparation time for single piece and small batch processing.
Under the realistic conditions of our country, if we follow the traditional thinking, it is difficult to realize the above approach. Therefore, we must base ourselves on the national conditions, be brave in innovation, and boldly explore new ways in combination with reality. Considering that the general structure of conventional CNC machine tools basically adopts the scheme that the workpiece and the tool move together along their respective guide rails, on the one hand, it is difficult for moving parts to obtain higher feed speed because of the lack of rigidity of the transmission link of the machine tool and the large friction resistance in the guide rails; On the other hand, because the total mass of workpiece, fixture and worktable is relatively large, it is difficult to obtain high acceleration. In addition, the traditional machine tool structure is series open chain structure, with many parts and complicated structure. Because of the gap between the cantilever member and the connecting rod, it is difficult to obtain high overall stiffness, so it is difficult to adapt to the special requirements of high-speed and efficient machining. Therefore, in the development of domestic high-speed and high-efficiency CNC machine tools, a new structure suitable for high-speed and high-efficiency machining centers can be adopted, that is, the workpiece is fixed, the parallel short chain composed of linear motors directly drives the spindle and the cutter to move, and the high-speed and high-precision transmission and high-rigidity support are integrated. The high-speed and high-efficiency CNC machine tool with this structure not only has high speed and stiffness, but also can achieve higher machining accuracy and quality than the conventional machine tool if it is properly handled in transmission and control. Moreover, it has obvious advantages such as simple mechanical structure, high degree of generalization and standardization of parts, low manufacturing cost and easy economic mass production. Therefore, the development of high-speed and efficient CNC machine tools along this line of thinking will be a road that conforms to the national conditions and is easy to succeed.
(3) Breakthrough the design and manufacturing technology of heavy CNC machine tools. Heavy CNC machine tools (especially multi-coordinate heavy CNC machine tools) are important key equipment in national economy and national defense production and belong to strategic materials. It is impossible for foreign countries to sell us truly advanced heavy CNC machine tools. Therefore, in the development of CNC products in China in the next century, we must rely on our own strength to solve it. The development of heavy CNC machine tools must have a solid foundation. We should constantly sum up the experience in the process of localization of CNC machine tools, strengthen the research on basic technologies and key technologies, give full play to the advantages of China's integration with Industry-University-Research, and work together with various departments and Qi Xin to make breakthrough progress at the beginning of the next century.
At present, in the development of heavy CNC machine tools, it is necessary to strengthen basic theoretical research and key technology research. For example, the control of heavy machine tools is a key problem that needs to be solved in particular. Because the workpieces processed by heavy machine tools are particularly expensive, they are not allowed to be scrapped. In order to ensure the reliability of the machine tool, dual (or multiple) CPU redundant working scheme can be adopted in the numerical control system to ensure the absolute correctness of operation and control, and automatic diagnosis, automatic repair or automatic replacement can be carried out when faults occur to ensure that there are no problems in processing. In addition, the power supply can be fully isolated by two batteries, that is, when one battery supplies power to the system, the other battery can be charged, and the power grid is completely isolated from the control system. This completely eliminates the influence of severe voltage fluctuation and interference in the heavy workshop on the numerical control system, thus effectively ensuring the reliability of the system. For another example, the driving of heavy CNC machine tools is also a key issue. When the stroke length exceeds 5 m, the ordinary ball screw is difficult to be competent for heavy-duty transmission. Therefore, at present, preloaded double rack and pinion mechanism, hydrostatic worm mechanism and four-legged (or two-legged) crawling feed mechanism are generally used to realize long-stroke transmission. However, these schemes have some problems, such as complex structure, low speed and acceleration, poor dynamic performance, difficult to achieve high precision and complex maintenance. Therefore, the direct drive technology of array high-efficiency linear motor and the drive technology of spatial parallel mechanism can be developed to solve the high-speed and high-precision drive problem of heavy CNC machine tools in a new way. In addition, the optimization design of machine tool structure, long-stroke accuracy detection, gravity deformation compensation, cutting force deformation compensation and thermal deformation compensation are also key problems that must be solved for heavy CNC machine tools, and must be fully valued.
3 Conclusion
It is very important for the development of numerical control technology and industry in China in the 2 1 century to formulate the overall development strategy in line with China's national conditions and establish the development path in line with international standards. Based on the analysis of the development trend of CNC technology and industry and the research on the existing problems in the field of CNC in China, this paper discusses the development path of CNC technology and industry in China in the 2 1 century, and puts forward the overall development strategy of taking scientific and technological innovation as the guide, commercialization as the main task, management and marketing as the focus, and relying on technical support and service. On this basis, the specific technical approaches to develop new CNC systems, CNC functional components and CNC machine tools are studied.
We sincerely hope that China's science, technology, industry and education will work together to seize the rare opportunity brought by knowledge economy and meet the severe challenge brought by competition globalization, so that China's numerical control technology and industry will be in the forefront of the world in the 2 1 century and maintain the strong development of China's economy.
Brief introduction of the author
Zhou Kai, male, was born in 1954. Tsinghua University (Beijing 100084), Associate Professor, Department of Precision Instruments and Machinery, Doctor of Engineering. Mainly engaged in numerical control technology, electromechanical control engineering, manufacturing science and manufacturing system research. Obtained 15 scientific research achievements. Published more than 70 papers.
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