The technical level and modernization degree of equipment industry determine the level and modernization degree of the whole national economy. Numerical control technology and equipment is the enabling technology and the most basic equipment for developing emerging high-tech industries and cutting-edge industries (such as information technology and its industries, biotechnology and its industries, aviation, aerospace and other national defense industries). Marx once said that "the difference between various economic times lies not in what is produced, but in how it is produced and by what means of labor". Manufacturing technology and equipment are the most basic means of production in human production activities, and numerical control technology is the core technology of advanced manufacturing technology and equipment today. In today's world, numerical control technology is widely used in manufacturing industry, in order to improve the manufacturing capacity and level, and improve the adaptability and competitiveness to the dynamic and changeable market. In addition, the developed countries in the world have also listed CNC technology and equipment as national strategic materials, not only taking significant measures to develop their own CNC technology and industry, but also implementing a blockade and restriction policy on China's "high-precision" CNC key technologies and equipment. In short, vigorously developing advanced manufacturing technology with numerical control technology as the core has become an important way for developed countries in the world to accelerate economic development and improve their comprehensive national strength and national status.
Numerical control technology is a technology that uses digital information to control the movement and working process of machinery. Numerical control equipment is a mechatronic product formed by the infiltration of new technologies represented by numerical control technology into traditional manufacturing and emerging manufacturing, which is called digital equipment. Its technical scope covers many fields: (1) mechanical manufacturing technology; (2) Information processing, processing and transmission technology; (3) automatic control technology; (4) Servo drive technology; (5) sensor technology; (6) Software technology, etc.
1 development of numerical control technology at home and abroad
The world manufacturing industry experienced several repetitions in the last decade of the 20th century, and once almost became a sunset industry, so Americans first proposed to revitalize modern manufacturing industry. In the 1990s, the world CNC machine tool manufacturing industry experienced a major restructuring. For example, great changes have taken place in several major manufacturers, such as the United States and Germany, which began to rebound obviously in the early 1990s, forming a new wave of technological upgrading in the manufacturing industry all over the world. For example, the German machine tool industry started in 2000 and accepted the order contract three months later, and the production task was full.
The greatest scientific and technological achievement of human society in the 20th century was the invention and application of computers. The application of computer and control technology in machinery manufacturing equipment is the most significant technological progress in the development of manufacturing industry in this century. It has been 50 years since 1952, when the 1 CNC milling machine in America came out. Numerical control equipment includes turning, milling, machining center, boring, grinding, stamping, electro-machining and various special planes, forming a huge family of numerical control manufacturing equipment, with an annual output of 65,438+0,000 ~ 200,000 units worldwide and an output value of tens of billions of dollars.
The world manufacturing industry experienced several repetitions in the last decade of the 20th century, and once almost became a sunset industry, so Americans first proposed to revitalize modern manufacturing industry. In the 1990s, the world CNC machine tool manufacturing industry experienced a major restructuring. For example, great changes have taken place in several major manufacturers, such as the United States and Germany, which began to rebound obviously in the early 1990s, forming a new wave of technological upgrading in the manufacturing industry all over the world. For example, the German machine tool industry started in 2000 and accepted the order contract three months later, and the production task was full.
China CNC machine tool manufacturing industry had a high-speed development stage in 1980s, and many machine tool factories realized the transformation from traditional products to CNC products. But generally speaking, the technical level is not high and the quality is not good. Therefore, in the early 1990s, faced with the transfer and adjustment of the national economy from a planned economy to a market economy, it experienced the most difficult depression in recent years, when the production capacity dropped to 50% and the inventory exceeded four months. Since 1995 "Ninth Five-Year Plan", the country has started the machine tool market by expanding domestic demand, strengthened the examination and approval of restricting the import of CNC equipment, and mainly invested in supporting the research of key CNC systems, equipment and technologies, which greatly promoted the production of CNC equipment. Especially after 1999, the state invested a lot of technical transformation funds in the national defense industry and key civilian industries, which made the CNC equipment manufacturing market prosperous. The prosperity of various products can also be seen from the Shanghai CNC Machine Tool Exhibition in August 2000 and the Beijing International Machine Tool Exhibition in April 20001. But it also reflects the following problems:
(1) The competition of low-tech products is fierce, and the prices are pushed down to promote each other;
(2) High-tech and full-featured products mainly rely on imports;
(3) High-quality functional parts and accessories for CNC system are mainly imported;
(4) The application technology level is low, and the networking technology is not fully popularized;
(5) Products with poor independent development ability and relatively high technical level mainly rely on imported drawings, joint venture production or imported parts assembly.
The number of CNC machine tools owned by industrial countries in the world today reflects the country's economic capacity and national defense strength. At present, China has the largest number of machine tools (nearly 3 million) in the world, but the numerical control rate of our machine tools is only about 1.9%, which is far from the general 20% in western industrial countries. There are less than 800,000 machine tools in Japan, but the manufacturing capacity is nearly 10 times that of China. The low numerical control rate, low utilization rate and low startup rate of the existing numerical control machine tools are the most important problems that must be solved first to develop China manufacturing industry in the 2 1 century. China produces 3000 ~ 4000 full-function CNC machine tools every year, and Japan/KLOC-0 produces more than 50,000 CNC machine tools. We spend more than one billion dollars to import 7000 ~ 9000 CNC machine tools every year. Even so, it is difficult for China's manufacturing industry to greatly improve the numerical control rate of the industry. Therefore, the State Planning Commission and the Economic and Trade Commission put forward the policy of numerical control transformation from the Eighth Five-Year Plan and the Ninth Five-Year Plan. During the Ninth Five-Year Plan period, our association also conducted research. By then, the number of equipment to be modified by numerical control can reach 800 ~ 65438+10,000 sets, and the investment is 80 ~10 billion yuan, but the economic benefit will be more than 5 ~ 10 times of the investment. So in the past two years, a large number of enterprise companies have emerged, and even American companies have joined. At the beginning of the Tenth Five-Year Plan, the Commission of Science, Technology and Industry for National Defense explicitly proposed to invest 680 million yuan in military enterprises for the numerical control transformation of 1.2 ~ 1.8 million machine tools.
After 50 years of two stages and six generations of development, numerical control technology;
Phase 1: Hardware Numerical Control (NC)
1 generation: 1952 electron tube
Second generation: 1959 transistor separation element
Third Generation: 1965 Small Scale Integrated Circuit
The second stage: software numerical control (CNC)
The fourth generation: 1970 minicomputer
The fifth generation: 1974 microprocessor
Sixth generation: 1990 based on personal computer (PC-baseo)
The advantages of the sixth generation system mainly include:
(1) components have high integration, good reliability and high performance, and the reliability reaches more than 50,000 hours;
(2) Based on the PC platform, the technology progress is fast and the upgrade is easy;
(3) It provides an open foundation, and the available software and hardware resources are rich, so that the numerical control function can be extended to a wide range of fields (such as CAD, CAM, CAPP, connecting network cards, sound cards, printers, cameras, etc.). );
(4) For CNC system manufacturers, it provides an excellent development environment and simplifies the hardware.
At present, the largest numerical control system manufacturer in the world is FANUC Company of Japan, which produces more than 50,000 sets of systems 1 year, accounting for about 40% of the world market, followed by Siemens Company of Germany, accounting for more than 15%, followed by Heidelberg of Germany, Fogg of Spain, Fidia of Italy, NUM of France, Mitsubishi and An Chuan of Japan.
Domestic CNC system manufacturers mainly include Huazhong CNC, Beijing Aerospace Machine Tool CNC Group, Beijing Kaiendi, Beijing Cage, Shenyang Yitian, guangzhou cnc, Nanjing Xinfangda and Chengdu Guang Tai. Domestic CNC manufacturers are small in scale, with an annual output of no more than 300 ~ 400 units.
In recent 10 years, in order to adapt to the development of machining technology, CNC machine tools have made great progress in the following technical fields.
(1) Expressway
Due to the popularization of high-speed machining technology, the speed of machine tools in all aspects is generally improved. The spindle speed of lathe is increased from 3000 ~ 4000 rpm to 8000 ~ 10000 rpm, and the spindle speed of milling machine and machining center is increased from 4000 ~ 8000 rpm to 12000 rpm and 24000 rpm. The fast moving speed is increased from 10 ~ 20m/min to 48m/min, 60m/min, 80m/min and 120m/min. At the same time, it is required to improve the starting acceleration of moving parts, from 0.5G (gravity acceleration) of general machine tools in the past to 1.5 ~ 2g, and the highest is 65438.
(2) High accuracy
The positioning accuracy of NC machine tools is improved from 0.0 1 ~ 0.02 mm to about 0.008mm, sub-micron machine tools to about 0.0005mm, and nano-scale machine tools to about 0.005 ~ 0.0 1 micron, and the minimum resolution is 1 nm (0.0000 1 mm).
CNC interpolation technology with more than two axes has been greatly improved. Nano-scale interpolation can make the arc of two-axis link reach 1μ. Before interpolation, many program segments are read in advance, which greatly improves the interpolation quality and can be used for automatic corner processing.
(3) Compound machining and new structure machine tools appear in large numbers.
For example, 5-axis 5-face compound machining machine tool, 5-axis 5 linkage machining all kinds of special-shaped parts. Various novel machine tool structures are also derived, including 6-axis virtual axis machine tool, series-parallel hinge machine tool and so on. Adopt special mechanical structure, special numerical control operation mode and special programming requirements.
(4) Use all kinds of efficient special tools to make the CNC machine tools "more powerful". For example, the internal cooling drill greatly improves the efficiency when drilling deep holes, because the high-pressure coolant directly cools the cutting edge of the drill and removes chips. The cutting speed of steel parts can reach 1000m/min, and that of aluminum parts can reach 5000m/min.
(5) The openness and network management of CNC machine tools are the basic requirements for using CNC machine tools. It is not only a necessary means to improve the running rate and productivity of CNC machine tools, but also a way for enterprises to rationalize and optimize the use of these manufacturing methods. Therefore, the development of computer integrated manufacturing, network manufacturing, remote diagnosis, virtual manufacturing, remote engineering and other new technologies on the basis of CNC machine tools will inevitably become a major trend in the development of manufacturing industry in the 2/kloc-0 century.
2, the development trend of numerical control technology
The application of numerical control technology has not only brought revolutionary changes to the traditional manufacturing industry, making the manufacturing industry a symbol of industrialization, but also played an increasingly important role in the development of some important industries (IT, automobile, light industry, medical care, etc.). ) With the continuous development of numerical control technology and the continuous expansion of application fields, the digitalization of equipment required by these industries has become a major trend of modern development. According to the development trend of numerical control technology and its equipment in the world, its main research hotspots are [1 ~ 8].
2. 1 New trend of high-speed and high-precision machining technology and equipment
Efficiency and quality are the mainstay of advanced manufacturing technology. High-speed and high-precision machining technology can greatly improve efficiency, improve product quality and grade, shorten production cycle and improve market competitiveness. Therefore, Japan Advanced Technology Research Association listed it as one of the five major technologies of modern manufacturing, and CIRP identified it as one of the central research directions in 2 1 century.
In the field of automobile industry, the production cycle of 300,000 cars per year is 40 seconds, and multi-variety processing is one of the key problems that automobile equipment must solve. In the aerospace field, most of the machined parts are thin-walled ribs with poor stiffness, and the materials are aluminum or aluminum alloy. Only under the condition of high cutting speed and small cutting force can these ribs and walls be machined. Recently, large-scale components such as wings and fuselage are manufactured by hollowing out large-scale integral aluminum alloy blanks, instead of assembling multiple components through numerous rivets and screws, so that the strength, stiffness and reliability of the components are improved. All these require high speed, high precision and high flexibility for processing equipment.
According to EMO200 1, the feed speed of high-speed machining center can reach 80m/min or even higher, and the idling speed can reach about 100m/min. At present, many automobile factories in the world, including Shanghai General Motors Corporation in China, have partially replaced modular machine tools with production lines composed of high-speed machining centers. The HyperMach machine tool of Cincinnati, USA has a maximum feed speed of 60m/min, a fast speed of 100m/min, an acceleration of 2g, and a spindle speed of 60 000r/min. It only takes 30 minutes to process a thin-walled aircraft part, while it takes 3 hours to process the same part on a common high-speed milling machine and 8 hours on a common milling machine. The spindle speed and acceleration of the double-spindle lathe produced by German DMG company reach 12* respectively! 000 rpm and 1 g.
In terms of machining accuracy, in recent 10 years, the machining accuracy of ordinary CNC machine tools has increased from 10μm to 5μm, and the precision machining center has increased from 3 ~ 5μ m to 1 ~ 1.5μ m, and the ultra-precision machining accuracy has begun to enter the nanometer level (0.0 1μm).
In terms of reliability, the MTBF value of foreign numerical control devices has reached more than 6 000h, and the MTBF value of servo system has reached more than 30000h, showing very high reliability.
In order to realize high-speed and high-precision machining, motorized spindle, linear motor and other supporting functional components have developed rapidly and their application fields have been further expanded.
2.2 Five-axis linkage machining bsp
Using five-axis linkage to process three-dimensional curved parts, the tool can cut the best geometric shape, which not only has high smoothness, but also greatly improves efficiency. Generally speaking, the efficiency of 1 five-axis machine tool can be equivalent to that of two three-axis machine tools, especially when cubic boron nitride, a superhard material milling cutter, is used for high-speed milling hardened steel parts, five-axis machining can bring more benefits than three-axis machining. However, in the past, due to the complex structure of five-axis CNC system and host computer, the programming technology was difficult, and its price was several times higher than that of three-axis CNC machine tools, which restricted the development of five-axis CNC machine tools.
At present, due to the appearance of motorized spindle, the structure of compound spindle head used for 5-axis linkage machining is greatly simplified, its manufacturing difficulty and cost are greatly reduced, and the price gap of CNC system is narrowed. Thus, the development of compound spindle head five-axis linkage machine tool and compound machining machine tool (including five-sided machining machine tool) is promoted.
At EMO200 1 exhibition, NIKO's 5-face machining machine tool adopted the compound spindle head, which can realize the machining of 4 vertical faces and arbitrary angles, so that 5-face machining and 5-axis machining can be realized on the same machine tool, and the machining of inclined planes and inverted cone holes can also be realized. DMUVoution series machining centers exhibited by German DMG company can carry out five-sided machining and five-axis linkage machining under one clamping, and can be directly or indirectly controlled by CNC system or CAD/CAM.
2.3 Intelligentization, openness and networking have become the main trends in the development of contemporary CNC systems.
The numerical control equipment in 2 1 century will be an intelligent system, which includes all aspects of the numerical control system: in order to pursue the intelligence of machining efficiency and machining quality, such as adaptive control of machining process and automatic generation of process parameters; In order to improve the driving performance and intelligent connection, such as feedforward control, adaptive operation of motor parameters, automatic load identification, automatic selection and self-correction. Simplify programming and simplify the intelligence of operation, such as intelligent automatic programming and intelligent man-machine interface; There are also intelligent diagnosis, intelligent monitoring, convenient system diagnosis and maintenance.
In order to solve the problems existing in closed traditional numerical control system and industrial production numerical control application software. At present, many countries are studying open CNC systems, such as NGC (Next Generation Workstation/Machine Tool Control) in the United States and OSACA(Op) in Europe.
And China's ONC (Open Numerical Control System). The openness of CNC system has become the future of CNC system. The so-called open CNC system means that the development of CNC system can be oriented to machine tool manufacturers and end users on a unified operating platform. By changing, adding or reducing structural objects (CNC functions), serialization can be formed, and users' special applications and technical know-how can be easily integrated into the control system, so as to quickly realize open CNC systems of different varieties and grades and form brand-name products with distinctive personality. At present, the architecture specification, communication specification, configuration specification, running platform, CNC system function library and CNC system function software development tools of open CNC system are the core of current research.
Networked numerical control equipment is a new bright spot in the internationally renowned machine tool Expo in recent two years. The networking of CNC equipment will greatly meet the information integration needs of production lines, manufacturing systems and manufacturing enterprises, and it is also the basic unit to realize new manufacturing modes such as agile manufacturing, virtual enterprise and global manufacturing. Some well-known CNC machine tools and CNC system manufacturing companies at home and abroad have introduced related new concepts and prototypes in recent two years, such as "CyberProduction Center" (CPC) exhibited by Mazak Yamazaki at EMO200 1; Daisuke Machine Tool Company of Japan exhibited "IT Plaza" (Information Technology Plaza, referred to as IT Plaza); The open manufacturing environment (OME) displayed by Siemens in Germany reflects the trend of NC machine tool processing towards networking.
2.4 Pay attention to the establishment of new technical standards and specifications.
2.4. 1 on the design and development of CNC system
As mentioned above, the open CNC system has better universality, flexibility and adaptability. Many countries have implemented strategic development plans, studied and formulated open architecture CNC system specifications (OMAC, Osaca, OSEC). The three largest economies in the world have made almost the same scientific plans and specifications in a short period of time, which indicates the arrival of a new period of change in numerical control technology. In 2000, China also began to study and formulate the standard framework of ONC CNC system in China.
2.4.2 About numerical control standards
Numerical control standard is the development trend of manufacturing informatization. In the 50 years after the birth of numerical control technology, information exchange is based on ISO6983 standard, that is, G code and M code are used to describe how to process, and its essential feature is process-oriented. Obviously, it can no longer meet the needs of the rapid development of modern numerical control technology. Therefore, a new numerical control system standard ISO 14649 (Step-NC) is being studied and formulated internationally, aiming at providing a neutral mechanism that can describe the unified data model of the whole product life cycle without depending on a specific system, thus realizing the standardization of product information in the whole manufacturing process and even in various industrial fields.
The appearance of STEP-NC may be a revolution in the field of numerical control technology, which will have a far-reaching impact on the development of numerical control technology and even the whole manufacturing industry. First of all, STEP-NC put forward a brand-new manufacturing concept. In the traditional manufacturing concept, NC machining programs are concentrated on a single computer. Under the new standard, numerical control programs can be published on the Internet, which is the direction of open and networked development of numerical control technology. Secondly, STEP-NC system can greatly reduce the processing drawings (about 75%), programming time (about 35%) and processing time (about 50%).
At present, European and American countries attach great importance to the study of STEP-NC, and Europe initiated the IMS plan of STEP-NC (1999.1.1~ 2001.12.31). Twenty CAD/CAM/CAPP/CNC users, manufacturers and academic institutions from Europe and Japan participated in this project. STEP Tools is an American company and a global developer of data exchange software. He developed a super model for information exchange of CNC machine tools, with the goal of describing all machining processes with unified specifications. At present, this new data exchange format has been verified on the prototype equipped with Siemens, FIDIA and European OSACA-NC numerical control systems.
2.5 Flexibility includes two aspects: the flexibility of the numerical control system itself, the modular design of the numerical control system, large functional coverage and strong tailoring, which can easily meet the needs of different users; The flexibility of the group control system, the same group control system can automatically and dynamically adjust the logistics and information flow according to the requirements of different production processes, thus maximizing the efficiency of the group control system.
2.6 Multi-axis compound machining with complicated working procedures and the main purpose of reducing working procedures and auxiliary time is developing to multi-axis and multi-series control functions. The process compounding of NC machine tool refers to the compound machining of multi-process and multi-surface by automatic tool changing, rotating spindle head or turntable after the workpiece is clamped on the machine tool once. Siemens 880 system can control 24 shafts. (4) Real-time Intelligentization The early real-time system is usually aimed at a relatively simple ideal environment, and its role is how to schedule tasks and ensure that tasks are completed within the specified time limit. Artificial intelligence, on the other hand, tries to use computational models to realize various intelligent behaviors of human beings. With the development of science and technology, real-time system and artificial intelligence are combined with each other, artificial intelligence is developing towards a more realistic field with real-time response, and real-time system is also developing towards a more complex application with intelligent behavior, thus creating a new field of real-time intelligent control. In the field of numerical control technology, the research and application of real-time intelligent control are developing along several main branches: adaptive control, fuzzy control, neural network control, expert control, learning control, feedforward control and so on. For example, the numerical control system is equipped with adaptive adjustment systems such as programming expert system, fault diagnosis expert system, automatic parameter setting, automatic tool management and compensation, etc., and functions such as advance prediction and budget, dynamic feedforward are introduced into the comprehensive motion control during high-speed machining, and fuzzy control is adopted in the pressure, temperature, position and speed control, so that the control performance of the numerical control system is greatly improved, thus achieving the purpose of optimal control.
2.7 Functional development direction
(1) User Interface Graphical user interface is a dialogue interface between CNC system and users. Because different users have different requirements for interface, the workload of developing user interface is huge, and user interface has become one of the most difficult parts in computer software development. At present, the Internet, virtual reality, scientific computing visualization and multimedia technology also put forward higher requirements for user interface. Graphical user interface greatly facilitates the use of non-professional users, and people can operate through windows and menus, which facilitates the realization of blueprint programming and rapid programming, three-dimensional color three-dimensional dynamic graphic display, graphic simulation, graphic dynamic tracking and simulation, different direction views and local display scaling functions.
(2) Visualization of scientific computing Visualization of scientific computing can be used to process and interpret data efficiently, so that information exchange is no longer limited to words and languages, but can directly use visualization information such as graphics, images and animations. The combination of visualization technology and virtual environment technology further broadens the application fields such as drawing-free design and virtual prototype technology, which is of great significance for shortening product design cycle, improving product quality and reducing product cost. In the field of numerical control technology, visualization technology can be used in CAD/CAM, such as automatic programming design, automatic parameter setting, dynamic processing and display of tool compensation and tool management data, visual simulation demonstration of machining process, etc.
(3) Interpolation and compensation methods are diversified, such as linear interpolation, circular interpolation, cylindrical interpolation, spatial elliptic surface interpolation, thread interpolation, polar coordinate interpolation, 2D+2 spiral interpolation, nano-interpolation, NURBS interpolation (non-uniform rational B-spline interpolation), spline interpolation (A, B, C-spline interpolation), polynomial interpolation, etc. A variety of compensation functions, such as clearance compensation, verticality compensation, quadrant error compensation, pitch and measurement system error compensation, feed-forward compensation related to speed, temperature compensation, tool radius compensation with smooth feed and retract, and calculation of relative points, etc.
(4) Built-in high-performance PLC CNC system has built-in high-performance PLC control module, which can be programmed directly with ladder diagram or high-level language, and has intuitive online debugging and online help functions. Programming tools include examples of standard PLC user programs for lathes and milling machines. Users can edit and modify the standard PLC user programs, thus conveniently establishing their own application programs.
(5) Multimedia technology applies multimedia technology to integrate computer, audio-visual and communication technologies, so that computers have the ability to comprehensively process sound, text, images and video information. In the field of numerical control technology, the application of multimedia technology can make information processing comprehensive and intelligent, which has great application value in real-time monitoring system, equipment fault diagnosis in production site, production process parameter monitoring and so on.
2 .8 the development of architecture
(1) Integration adopts highly integrated CPU, RISC chip, large-scale programmable integrated circuit FPGA, EPLD, CPLD and ASIC chip, which can improve the integration of numerical control system and the running speed of software and hardware. The application of FPD flat panel display technology can improve the display performance. Flat panel display has the advantages of high technology content, light weight, small volume, low power consumption and portability, and can realize super-large display. It has become a new display technology to compete with CRT, and it is the mainstream of 2 1 century display technology. Advanced packaging and interconnection technology is applied to integrated semiconductor and surface mount technology. By increasing the density of integrated circuits, the length and number of interconnects are reduced, the product price is reduced, the performance is improved, the component size is reduced, and the reliability of the system is improved.
(2) Modular hardware modularization is easy to realize the integration and standardization of CNC system. According to different functional requirements, the basic modules such as CPU, memory, position servo, PLC, I/O interface, communication and other modules are made into standard series products, and the functions are cut and the number of modules is increased or decreased by building blocks to form different grades of CNC systems.
(3) Networked machine tools can be networked for remote control and unmanned operation. Through the networking of machine tools, other machine tools can be programmed, set, operated and run on any machine tool, and at the same time, different machine tools can be displayed on the screen of each machine tool.
(4) The general open closed-loop control mode adopts a general computer to form a bus, modular, open and embedded architecture, which is convenient for cutting, expanding and upgrading, and can form CNC systems with different grades, types and integration. Closed-loop control mode is proposed for the only dedicated single-machine closed-loop control mode in traditional CNC system. Because the manufacturing process is a complex process of multi-variable control and machining technology, including machining size, shape, vibration, noise, temperature and thermal deformation, in order to realize multi-objective optimization of machining process, multi-variable closed-loop control must be adopted to dynamically adjust machining process variables in real-time machining process. The machining process adopts an open and universal real-time dynamic closed-loop control mode, which is easy to integrate computer real-time intelligent technology, network technology, multimedia technology, CAD/CAM, servo control, adaptive control, dynamic data management, dynamic tool compensation, dynamic simulation and other high and new technologies, forming a strict closed-loop control system of the manufacturing process and realizing integration, intelligence and networking.
3. Intelligent numerical control system
3. 1 Overview of CNC system development at home and abroad
With the rapid development of computer technology, the traditional manufacturing industry has begun a fundamental change. Developed countries have invested heavily in the research and development of modern manufacturing technology and put forward a brand-new manufacturing model. Modern manufacturing