2. Power requirements;
3, CNC machine tools should have operating procedures: regular maintenance, maintenance, pay attention to the record to protect the scene in case of failure, etc. ;
4, CNC machine tools should not be sealed for a long time, long-term storage will lead to storage system failure and data loss;
5, pay attention to training and equipped with operators, maintenance personnel and CNC system maintenance programmers.
1, strictly abide by the operating procedures and daily maintenance system.
2. Prevent dust from entering the numerical control device: floating dust and metal powder can easily reduce the insulation resistance between components, leading to failure or even damage of components.
3. Regularly clean the cooling and ventilation system of the CNC cabinet.
4. Regularly monitor the grid voltage of the numerical control system: the grid voltage ranges from 85% to 1 10% of the rated value.
5. Replace the battery regularly.
6. Maintenance of the CNC system when it is not used for a long time: often power up the CNC system or let the CNC machine run the preheating program.
7. Maintenance of spare circuit boards and maintenance of mechanical parts
Maintenance of mechanical parts
1, Maintenance of tool magazine and tool changing manipulator
1) When manually loading the tool into the tool magazine, ensure that the tool is in place and check whether the locking on the tool rest is reliable;
2) It is forbidden to load overweight and too long tools into the tool magazine to prevent the manipulator from dropping the tool or the tool colliding with the workpiece and fixture when changing the tool;
3) When using the sequential tool selection method, pay attention to whether the tool placement order on the tool magazine is correct. Other tool selection methods should also pay attention to whether the tool change number is consistent with the required tool to prevent accidents caused by changing the wrong tool;
4) Pay attention to keep the handle and tool sleeve clean;
5) Always check whether the zero position of the tool magazine is correct, check whether the position of the tool changing point of the machine tool spindle is in place, and adjust it in time, otherwise the tool changing action cannot be completed;
6) When starting the machine, idle the tool magazine and manipulator first, and check whether all parts work normally, especially whether the travel switches and solenoid valves can work normally.
2. Maintenance of ball screw pair
1) Regularly check and adjust the axial clearance of the screw nut pair to ensure the reverse transmission accuracy and axial stiffness;
2) Regularly check whether the connection between the screw support and the lathe bed is loose and whether the support bearing is damaged. In case of the above problems, fasten the loose parts in time and replace the support bearing;
3) Ball screw with grease should be used to clean the old grease on the screw once every six months and replace it with new grease. Ball screw lubricated with lubricating oil should be oiled once a day before the machine works;
4) When working, pay attention to avoid hard dust or chips from entering the spiral shield and damaging the shield. If there is any damage, replace the protective device in time.
3. Maintenance of main drive chain
1) Regularly adjust the tightness of the spindle drive belt;
2) Prevent all kinds of impurities from entering the oil tank. Change the lubricating oil once a year;
3) Keep the joint between the spindle and the handle clean. Adjust the displacement of hydraulic cylinder and piston in time;
4) Adjust the counterweight in time.
4, hydraulic system maintenance
1) filter or change the oil regularly;
2) control the oil temperature in the hydraulic system;
3) prevent the hydraulic system from leaking;
4) Check and clean the oil tank and pipeline regularly;
5) Implement the daily inspection system.
5, pneumatic system maintenance
1) Remove impurities and moisture in compressed air;
2) Check the oil supply of the oil mist device in the system;
3) Keep the system airtight;
4) Pay attention to adjusting the working pressure;
5) Clean or replace pneumatic components and filter components; In CNC machine tools, most faults can be found, but there are also some faults. The provided alarm information is vague or even no alarm at all, or the period is long, irregular and irregular, which brings many difficulties to the search and analysis. For this kind of machine tool fault, it is necessary to analyze the specific situation and find it patiently. In particular, comprehensive knowledge of machinery, electricity and hydraulic pressure is needed during inspection, otherwise it is difficult to find the real cause of the fault quickly and correctly.
Abnormal failure of machining accuracy: The common causes of abnormal failure of machining accuracy of CNC machine tools in production are the change or modification of system parameters, mechanical failure, abnormal motor operation without optimizing the electrical parameters of the machine tool, abnormal position ring of the machine tool or improper control logic. Find out the relevant fault points and deal with them, and the machine tool can return to normal. In production, we often encounter faults with abnormal machining accuracy of CNC machine tools. This kind of fault is hidden and difficult to diagnose.
There are five main reasons for this failure:
1, machine tool feed unit changes or changes;
2. The zero offset of each axis of the machine tool is abnormal;
3. Abnormal axial clearance;
4. The motor runs abnormally, that is, the electrical and control parts are faulty;
5, mechanical failure, such as screws, bearings, couplings and other parts.
In addition, the preparation of machining program, the choice of cutting tools and human factors may also lead to abnormal machining accuracy.
Abnormal machining accuracy caused by mechanical failure should be mainly checked from the following aspects.
1, check the running machining program section when the accuracy of the machine tool is abnormal, especially the tool length compensation, and the proofreading and calculation of the machining coordinate system (G54~G59).
2. In inching mode, the Z axis moves repeatedly. After watching, touching and listening to its motion state, it is found that the Z-direction motion sound is abnormal, especially when it moves quickly, the noise is more obvious. Judging from this, there may be hidden dangers in machinery. 1. Initialization and reset method: In general, the system alarm caused by instantaneous fault can be cleared by hardware reset or switching the system power supply in turn. If the working storage area of the system is chaotic due to power failure, unplugging the circuit board or battery undervoltage, the system must be initialized and cleared, and data copy records should be made before clearing. If the fault cannot be eliminated after initialization, hardware diagnosis should be carried out.
2. Method of parameter change and program correction: System parameters are the basis for determining system functions, and wrong parameter setting may lead to system failure or a certain function is invalid. Sometimes, due to user program errors, it will also lead to downtime. In this regard, the block search function of the system can be used to check and correct all errors to ensure its normal operation.
3. Adjustment and optimization adjustment method: Adjustment is the simplest method. By adjusting the potentiometer, the system fault is corrected. For example, when a factory is in maintenance, its system display screen is chaotic and normal after adjustment. For example, in a factory, the main shaft belt slips when starting and braking, because the load torque of the main shaft is large, and the climbing time of the driving device is set too short, which is normal after adjustment.
Optimal adjustment is a comprehensive adjustment method that matches the servo drive system with the dragged mechanical system. The method is simple. Use multi-line recorder or double-track oscilloscope with storage function to observe the response relationship between instructions and speed feedback or current feedback respectively. By adjusting the proportional coefficient and integration time of the speed regulator, the servo system can achieve the best working state with no oscillation and high dynamic response characteristics. When there is no oscilloscope or recorder on site, adjust the motor to start vibration according to experience, and then adjust it slowly in the opposite direction until the vibration is eliminated.
4. Spare parts replacement method: replace the diagnosed bad circuit board with good spare parts, and initialize and start it accordingly, so that the machine tool can be put into normal operation quickly, and then repair or repair the bad board. This is the most commonly used troubleshooting method.
5. Method of improving power quality: Generally, regulated power supply is used to improve power supply fluctuation. Capacitance filtering method can be used for high frequency interference, and these preventive measures can reduce the failure of power board.
6. Maintenance information tracking method: Some large manufacturing companies constantly modify and improve system software or hardware according to unexpected failures caused by design defects in actual work. These modifications are continuously provided to maintenance personnel in the form of maintenance information. Based on this, troubleshooting can be done correctly and thoroughly. There are three stages in electrical fault diagnosis of CNC machine tools: fault detection, fault judgment and isolation, and fault location. The first stage of fault detection is to test the CNC machine tool to determine whether there is a fault; The second stage is to determine the nature of the fault and separate the faulty components or modules; The third stage is to locate the fault to the replaceable module or printed circuit board to shorten the maintenance time. In order to find the fault in the system in time, locate the fault position quickly and eliminate it in time, it is required that the fault diagnosis is as simple as possible and the time required for fault diagnosis is as short as possible. For this purpose, the following diagnostic methods can be used:
1, intuitive method
Using the sensory organs, pay attention to various phenomena when the fault occurs, such as whether there are sparks and lights, whether there is abnormal noise, where there is abnormal fever, and whether there is burnt smell. It is the most basic and common method to carefully observe the surface condition of each printed circuit board that may fail, whether there are traces of burning and damage, so as to further narrow the scope of inspection.
2. The self-diagnosis function of numerical control system
Depending on the ability of numerical control system to process data quickly, the faulty parts are collected and processed in many ways and quickly, and then the diagnostic program makes logical analysis and judgment to determine whether there is a fault in the system and locate the fault in time. The self-diagnosis function of modern numerical control system can be divided into the following two categories:
1) Power-on self-diagnosis means that the diagnostic program in the system automatically tests the functions of CPU, memory, bus, I/O unit and other devices before running, such as printed circuit board, CRT unit, photoelectric reader, floppy disk drive, etc., to confirm whether the main hardware of the system can work normally.
2) Fault information prompt: When a fault occurs in the operation of the machine tool, the fault number and content will be displayed on the CRT display. According to the prompt, consult the relevant maintenance manual to confirm the cause of the fault and the troubleshooting methods. Generally speaking, the richer the fault information prompted by the diagnostic function of CNC machine tools, the more convenient the fault diagnosis will be. However, it should be noted that some faults can be directly confirmed according to the fault contents and by consulting the manual; However, the real causes of some faults are not consistent with the fault content, or there are multiple fault causes in a fault display, which requires maintenance personnel to find out the internal relationship between them and indirectly confirm the fault causes.
3, data and status check
The self-diagnosis of CNC system can not only display fault alarm information on CRT display, but also provide machine tool parameters and state information in the form of multi-page "diagnosis address" and "diagnosis data". There are two common data and status checks: parameter check and interface check.
1) parameter checking Machine tool data of CNC machine tools is an important parameter obtained through a series of tests and adjustments, which is the guarantee for the normal operation of machine tools. These data include gain, acceleration, contour monitoring tolerance, reverse clearance compensation value and pitch compensation value. When disturbed by the outside world, the data will be lost or confused, and the machine tool will not work normally.
2) Interface check Input/output interface signals between CNC system and machine tool include input/output interface signals between CNC system and PLC, and input/output interface signals between PLC and machine tool. The input/output interface diagnosis of CNC system can display the status of all switch signals on CRT display, and indicate the presence or absence of signals with "1" or "0". By using the status display, you can check whether the CNC system has output signals to the machine tool side and whether the switch signals of the machine tool side have been input to the CNC system, so that you can locate the fault on the machine tool side or in the CNC system.
4. The alarm indicator shows a fault.
In the CNC system of modern CNC machine tools, there are many "hardware" alarm indicators besides the above-mentioned self-diagnosis function and status display, which are distributed on power supply, servo drive and input/output equipment. According to the instructions of these warning lights, the cause of the fault can be judged.
5. Plate changing method
Replacing the template with a spare circuit board is a quick and simple method to judge the cause of the fault, which is often used in functional modules of CNC system, such as CRT module and memory module. It should be noted that before replacing the spare board, the relevant circuits should be checked to avoid the damage of the good board due to short circuit. At the same time, check whether the selector switch and jumper on the test board are consistent with the original template, and some templates should pay attention to the adjustment of potentiometer on the template. After replacing the memory board, the memory should be initialized according to the requirements of the system, otherwise the system will still not work normally.
6. Exchange method
In CNC machine tools, there are often modules or units with the same function. By exchanging the same modules or units with each other and observing the failover, the fault location can be quickly determined. This method is often used to check the failure of servo feed drive device, and can also be used to replace the same module in CNC system.
7, tapping method
The numerical control system consists of various circuit boards, and each circuit board has many solder joints. Any virtual welding or poor contact may lead to failure. When tapping a circuit board, connector or electrical component with an insulator, if there is a fault, it is likely to be at the tapping position.
8, measurement comparison method
In order to facilitate detection, the module or unit is equipped with detection terminals. Using multimeter, oscilloscope and other instruments, through the level or waveform detected by these terminals, we can compare the normal value with the value at the time of failure, and analyze the cause and location of the failure. Due to the strong comprehensiveness and complex structure of CNC machine tools, there are many factors leading to failures. The above fault diagnosis methods are sometimes applied at the same time, and the fault is comprehensively analyzed to quickly diagnose the fault location, so as to eliminate the fault. At the same time, some faults are electrical, but the causes are mechanical; On the contrary, it is also possible that the failure phenomenon is mechanical, but the cause is electrical; Or both. Therefore, its fault diagnosis can not be simply attributed to electrical or mechanical aspects, but must be considered comprehensively. As the cornerstone of modern industry, machine tool industry is a key issue that cannot be bypassed in the process of industrial economic development. Due to congenital deficiency, China machine tool industry has been lagging behind the foreign mainstream level in the development of high-end machine tool projects, and is currently in the process of catching up.
China CNC machine tools are still relatively backward. China CNC machine tool market is huge. Compared with foreign products, the gap in China is mainly in the high speed, high efficiency and precision of machine tools. China is in the middle stage of industrialization, that is, from opening to solving the shortage to building an economic power, and gradually changing from getting rid of poverty to becoming rich. A number of high-growth industries based on heavy industry, such as coal, automobile, steel, real estate, building materials, machinery, electronics and chemical industry, have developed strongly, which constitutes a huge demand for machine tool market, especially CNC machine tools.
The accelerated transformation of China machine tool industry faces four major constraints. At present, China's CNC machine tool technology can only achieve five-axis linkage at most, but according to relevant sources, these five axes are mostly for show, almost all of them are imported, and the multi-point linkage technology is far from the foreign technical level.
Intensified international competition in the domestic market: Due to the shrinking and overcapacity of the middle and low-grade CNC machine tool market and the influx of foreign low-priced products, the market competition will be further intensified. However, high-end products have long relied on imports, and domestic products are facing more severe international competition challenges.
Technology-leading strategy is changing to a customer-centered strategy: economic crisis often leads to large-scale industrial upgrading and enterprise transformation. The core of realizing manufacturing service in machine tool industry is to take customers as the center and actively provide personalized services that customers need. Therefore, it is a trend to change from simply selling products to providing total solutions and from technology-centered to customer-centered.
The market demand of China products is in great contrast with that of China, and the product structure needs to be adjusted quickly. Although the machine tool industry in China has maintained a sustained and rapid development for many years, the unreasonable industrial and product structure still exists. The whole industry is big but not strong, and high-end products still rely heavily on imports. Although the domestic market share of domestic machine tools has increased, the domestic market share of high-grade CNC machine tools and core functional components is still very low, and the whole industry has great potential to replace imports.
The enterprise's technological innovation mode needs to be improved: with the status, industrialization level and brand influence of China machine tool enterprise gradually improving, it can no longer rely on others' technological acquisition to become an industrial power. In the past, China took a road from imitation to introduction. From now on, it must take the road of independent innovation. Enterprise technology encounters a new blockade, and establishing an independent, new and strategic Industry-University-Research innovation model is the only way to support the technical source of product structure adjustment.
China CNC machine tool industry will continue the momentum of structural adjustment, and constantly occupy a larger market with new products and highlights. CNC cutting machine tools can be divided into flame cutting and plasma cutting according to cutting methods. With the increasing demand of downstream industries, there is a greater demand and higher requirements for CNC machine tool parts.
Northeast China is not developing fast, and other places are also developing slowly. The third is to adjust the structure and promote the transformation to see results. Experts believe that in the face of the financial crisis, enterprises should constantly adjust their structure, improve quality, increase varieties and promote industrial upgrading. In addition, enterprises should strengthen management and reduce costs, so the benefits of enterprises have been significantly improved. The decorative development trend of CNC cutting machine tools can be seen. CNC cutting machine tools emphasize mechanical properties, simple operation, economical price and stable machining accuracy. Today, with the increasing popularity and batch processing of metal materials, CNC cutting machine tools should not only meet the above functions, but also have the applicability of various cutting methods.
In order to improve their own strength and expand the international market more quickly, domestic CNC machine tool enterprises will take various measures to speed up the integration with foreign enterprises and improve product quality and competitiveness. While continuing to explore the markets of the United States, Japan and other countries, it has also blossomed in Southeast Asia, the Middle East, Russia, Europe and Africa. It is understood that the current operation of the metal cutting CNC machine tool industry has the following characteristics: First, it is difficult for export enterprises. From the perspective of enterprises above designated size, brand enterprises with domestic sales as the mainstay have a good development momentum. Small and medium-sized enterprises without brands are difficult to develop. Second, the development of various regions is not balanced enough. Zhejiang, Shandong, Hebei, Beijing and Sichuan have developed rapidly, and private enterprises in Guangdong have also developed rapidly.
Most enterprises in CNC cutting machine tool industry rely on reducing product prices to win the market, resulting in low product prices, low added value and low profits, and enterprises do not have enough funds for sustainable development. With the development of the industry and the upgrading of competition, it is the best choice for the long-term development of enterprises to improve the technical content of products, have independent patents and designs, and attach importance to brand building and marketing.
In the past few years, China's machine tool industry has achieved sustained ultra-high-speed development. Until the first half of 20 1 1, the demand was still very strong. However, since the second half of the year, the growth rate of demand has obviously slowed down, new orders have fallen sharply, economic benefits have gradually become severe, and profit margins have continued to decline.
During the Twelfth Five-Year Plan period, the state implemented a proactive fiscal policy and a prudent monetary policy. With the progress of science and technology, product upgrading and the continuous promotion of national key projects and local investment projects, the demand level of machine tool products in various industries of national economy will be further improved, the demand for high-level machine tools in national defense modernization will be more urgent, the market demand will develop to a higher level, and the new round of market competition will be more intense.
Due to the downturn of the industry, the demand of downstream manufacturing enterprises for machine tools has declined, so China's machine tool industry has been in a downturn, upgrading and transformation has become the key word of the industry in recent years, and economic CNC machine tools have become one of the key points to revitalize the equipment manufacturing industry.
China's foundry machine tool industry has made some achievements, but its development still faces many restrictive problems, and technological innovation has always been a serious injury to the domestic foundry machine tool industry. Compared with foreign foundry machine tool industry, China's foundry machine tool industry is obviously backward in manufacturing technology, which makes it have obvious shortcomings in the technical level and running speed of core running parts, product precision maintenance, machine tool reliability and so on.
China's foundry machine tool enterprises lack the awareness and ability of independent innovation and basic theoretical research, which restricts the development of China's foundry machine tool technology. In order to change this situation, it is necessary to deeply study the technical characteristics and requirements of products in the user industry, develop high-level processing equipment in combination with process characteristics, and attach importance to the research of basic theoretical work, so that China's foundry machine tool industry can develop better in the near future. A series of policies issued by the state have made great efforts to build emerging enterprises and high-tech enterprises, and seized this opportunity. A series of policies, such as "adjustment and revitalization" and "independent innovation", have been issued within the enterprise to upgrade machine tool technology and strictly ensure product quality, providing a good environment and market for accelerating the development of foundry machine tool industry.
Machine tool industry, as a national basic and strategic industry, has clearly put the strategy of independent innovation as the top priority in the Twelfth Five-Year Plan, emphasizing the need to support and lead the development of the industry with technological innovation projects. The development of China machine tool industry must be based on independent innovation, through independent research and development of original innovation, digestion and absorption of imported technology and innovation, and integration of existing technological innovation. To achieve key technological breakthroughs and industrial upgrading. Construct and improve the technological innovation system with enterprises as the main body, market as the guidance and Industry-University-Research as the combination; Insist on increasing investment in research and development expenses; Strengthen the research on key technologies and * * * technologies, strive to break through basic and * * * technologies, and improve the technical level of product development.
technological development
High-speed, precision, compound, intelligence and green are the general trends of NC machine tool technology development. In recent years, gratifying achievements have been made in practicality and industrialization. Mainly manifested in:
1, further development of machine tool compound technology With the technological progress of CNC machine tools, compound machining technology is becoming more and more mature, including milling-turning compound, turning-milling compound, turning-boring-drilling-gear machining, turning-grinding compound, forming compound machining and special compound machining. The precision and efficiency of compound machining are greatly improved. The concepts of "one machine tool is a processing factory" and "once loading the card and finishing the processing" are being accepted by more people, and the development of compound processing machine tools is showing a diversified trend.
2. The intelligent technology of CNC machine tools has made a new breakthrough, which has been reflected in the performance of CNC system. For example, the functions of interference automatic adjustment and anti-collision, power-off protection function of workpiece automatically exiting the safety zone after power-off, learning function of machining parts detection and automatic compensation, intelligent parameter selection function of high-precision machining parts, automatic elimination of machine tool vibration during machining and so on have entered the practical stage, and the function and quality of machine tools have been intelligently improved.
3. Robots make flexible combinations more efficient. The flexible combination of robot and host is widely used, which makes the flexible line more flexible, further expands its functions, further shortens the flexible line and improves its efficiency. Flexible units and flexible production lines such as robots and machining centers, turning-milling compound machine tools, grinders, gear machining machines, tool grinders, electric machining machines, sawing machines, punching machines, laser machining machines and water cutting machines have been applied.
4. New progress has been made in precision machining technology. The machining accuracy of CNC metal cutting machine tools is improved from the original linear level (0.0 1mm) to micron level (0.00 1mm), and some varieties reach about 0.05μm m. The micro-cutting and grinding accuracy of ultra-precision CNC machine tools can reach about 0.05μm, and the shape accuracy can reach about 0.01μ m. Through the optimization of machine tool structure design, ultra-precision machining and assembly of machine tool parts, and the adoption of high-precision closed-loop control and dynamic error compensation technology such as temperature and vibration, the geometric accuracy of machine tool machining is improved, and the form and position error and surface roughness are reduced, thus entering the era of sub-micron and nano-scale ultra-precision machining.
5. The performance of functional components is constantly improving. Functional components are constantly developing in the direction of high speed, high precision, high power and intelligence, and have achieved mature applications. The popularization and application of all-digital AC servo motor and driving device, high-tech motorized spindle, torque motor, linear motor, high-performance linear rolling assembly and high-precision spindle unit have greatly improved the technical level of CNC machine tools.
Development problem
The demand for CNC machine tools in China is increasing day by day, and the development of CNC machine tools promotes the innovation and upgrading of functional components of CNC machine tools. At present, China's high-end CNC machine tool key functional parts industry can not meet domestic demand, and the domestic CNC functional parts industry mainly has the following problems.
1, adaptability and satisfaction are far from the market demand.
Judging from the current development trend of CNC machine tools in China, the adaptability and satisfaction of domestic functional components are far from meeting the market demand. Mainly manifested in:
1) There is a certain gap between domestic functional parts and foreign products. Most of the functional components produced in China are labor-intensive and have low technical content, which makes it difficult to adapt to the development speed and technical requirements of domestic CNC machine tools, especially high-end CNC machine tools.
2) The domestic development ability of functional parts is weak, and the development speed of new products is slow. Most functional components need to be jointly developed, produced, operated and even assembled with foreign countries. Although the situation has changed obviously in recent two years, China is still in the process of developing high-tech and latest functional components, and its market share prospect is still not optimistic.
2, China's CNC functional parts manufacturing enterprises are small in scale.
According to statistics, there are more than 70 functional component manufacturers with fixed assets 100000 yuan, accounting for less than 10% of all the manufacturers. There are four origins of functional component manufacturers in China: one is an enterprise developed by scientific research institutes and universities with technical support, which can be called "institutional type". The characteristics of these enterprises are: they have a certain technical foundation and talent base, and have the development potential of many technologies, but the means of production are weak, and it is difficult to form an industrial scale in a short time, and there is also a certain gap in cost, marketing and service; 2. Enterprises that are gradually "independent" and "separated" from the OEM and mainly produce some functional parts can be called "OEM". These enterprises can adapt to the market demand in terms of production capacity, technical level and experience, and can form a certain scale. However, because it is inextricably linked with the original main machine factory, users often have doubts in the competition, which affects its market development. At the same time, their development ability has certain limitations, and it is difficult to form a famous brand. Third, a large number of private enterprises have emerged in Jiangsu and Zhejiang provinces, which can be called "private enterprise types". These enterprises are mainly labor-intensive and single-variety, such as chains, trailers, fuel injection pipes, chip cleaning machines and lighting equipment. Due to fierce competition, its quality and price can meet the market demand of middle and low-grade CNC machine tools. Although these varieties of high-grade products can not be manufactured yet, they still need to be imported, but they have largely adapted to the overall needs of the development of CNC machine tools in China; There are also some foreign joint ventures or wholly-owned enterprises that produce some high-end functional components, but the batch is small and there is no independent technology development ability, so it is difficult to become the main body and mainstream of functional components.
3. A large number of core components are imported.
The development of CNC machine tool industry in China is remarkable. In 2008, the total industrial output value of the national CNC machine tool industry was 3,472.3 billion yuan, and the product sales output value was 334.83 billion yuan, up by 27.5% and 26.0% respectively. From 2002 to 2008, China was the largest consumer and importer of machine tools in the world. However, behind the rapid development of the industry, a fact that can not be ignored is that the production of key components in China is still controlled by people, and there are low profits and lack of core competitiveness of products.
Lack of high-tech content threatens industrial safety.
China's machine tool exports have maintained a gratifying trend of increasing year after year, but the embarrassment of "increasing quantity and decreasing price" directly reflects our technical level. The lack of a large number of core technologies and the dependence on key components directly affect the safety of China's machine tool industry. Therefore, we need to strengthen the awareness of early warning, unite the wisdom and strength of the industry, and safeguard industrial safety.