Although China's current machine tool holdings are nearly 7 million units, it has become the world's largest machine tool holding country, but the overall level of machine tools is still relatively backward. Many products before the 1980s are still in service, which is difficult to meet the processing accuracy requirements. . According to statistics, at present, China's machine tools with more than 10 years of service age account for more than 60%. These machine tools may face overhaul and even functional retirement or technical elimination in the next 5 to 10 years, thus forming a considerable scale of recyclable potential. Resources. CNC remanufacturing is promising The "working machine" represented by CNC machine tools is the crystallization of digital control technology and precision manufacturing technology, and is a typical representative of advanced manufacturing equipment. In recent years, although the production of domestic high-precision machine tools, CNC machine tools and large-scale machine tools has grown rapidly, the share of machine tool products is still low due to the small base. At the same time, the numerical control rate of China's machine tools is still very low. According to the statistics provided by China Machine Tool Association, from 2000 to 2006, China's equipment manufacturing plants produced a total of 290,400 CNC equipment, about 30,000 exports, and domestic sales of 260,400; a total of 22,000 CNC equipment imported. In 2007, there were more than 120,000 domestic CNC machine tools. In addition, during the "Tenth Five-Year Plan" period, about 100,000 CNC equipments were upgraded. In addition, China had about 90,000 CNC equipments in 2000. It is estimated that China's current CNC equipment has about 700,000 units. At present, the numerical control rate of China's machine tools is increasing year by year. According to statistics, China's numerical control rate has increased from 3.2% in 1992 to 13.3% in 2005. However, compared with the numerical control rate of 60% to 70% of production in developed countries such as Japan, the United States, and Germany, and the numerical control rate of 80% to 90% of the output value, the numerical control rate of China's machine tool equipment is still too low. Since the 1960s, many major engineering projects in China have imported and manufactured a large number of large and heavy equipment. The mechanical parts of these machines have been used for many years and have good stability. The transformation of large-scale and large-sized machine tools by numerical control transformation has saved more funds, which is especially meaningful. Since the reform and opening up, China has imported a large number of CNC machine tools. At present, most of the machine tools have been used for 10 to 30 years, and the mechanical body and precision are kept intact. The electrical parts such as the numerical control system are seriously aging and urgently need to be modified. Foreign spare parts have been discontinued and it is difficult to buy. If the CNC system is completely transformed into a new foreign system, it is very expensive. Even if it is modified, because the foreign CNC system is updated quickly, it may take 10 years to renovate after 10 years. In addition, since the 1980s, China has produced a large number of economical CNC machine tools that use stepper motor control. Due to the low precision and lost steps of the stepping system, the system is not reliable. Now these machines have a large number of armpits and need to be modified. CNC remanufacturing of ordinary machine tools and aging CNC machine tools can not only achieve the same effect as purchasing new machine tools: improving part processing quality and productivity, shortening product manufacturing cycle, improving working environment; and reducing capital investment and purchase Compared with the new machine tool, it can save more than 50% of the funds. For example, the price of a set of economical CNC remanufacturing machine tools is only 1/5~1/3 of the same function of new CNC machine tools. In short, in the current economic situation, machine tool numerical control remanufacturing has very important significance in China at this stage, which can greatly save equipment investment, obtain advanced numerical control machine tools at a small cost, and improve processing efficiency and processing quality; Improve the existing machine tool performance of the enterprise and effectively improve the processing and manufacturing capabilities of the enterprise. At the same time, it will also form an emerging machine tool remanufacturing and service industry in China with important economic, social and environmental benefits. CNC system welcomes opportunities The main work content of a specific machine tool numerical control remanufacturing project includes two aspects of mechanical and electrical transformation, mainly: recovery and improvement of machine tool mechanical precision, recovery and improvement of motion precision, selection of CNC system and servo system, and auxiliary The selection of the device, as well as the machine debugging, machine tool inspection and other aspects. Among them, the selection and use of numerical control system and servo system is the key to directly affect the engineering benefits. The contents of numerical control remanufacturing of machine tools are briefly described as follows: First, the accuracy recovery and improvement of the mechanical transmission part of the random bed use age, the mechanical transmission parts of the machine tool, such as guide rails, lead screws, bearings, etc. have different degrees of wear. Therefore, the primary task in the remanufacturing process of the machine tool is to perform a machine tool overhaul similar to the usual machine tool to restore the machine tool accuracy and meet the manufacturing standards of the new machine tool. Therefore, the machine tool numerical control remanufacturing can be combined with the overhaul of the machine tool, but the machine tool The accuracy of numerical control on the accuracy of machine tools is different from the overhaul of ordinary machine tools. That is, the restoration of the accuracy of the whole machine tool and the improvement of the mechanical transmission part must be carried out to meet the structural characteristics of CNC machine tools and the requirements of CNC automatic machining. Features with batch overhaul. Second, the selected CNC system and servo system According to the control function requirements of the CNC remanufacturing machine tool, it is crucial to select the appropriate CNC system, which directly determines the success or failure of CNC remanufacturing. Since the numerical control system is the command center of the whole CNC machine tool, in addition to considering the functions to meet the requirements, it is also necessary to ensure the reliability of the system. Generally, it is selected by performance price ratio, and appropriate consideration is given to the after-sales service and fault repair. If the domestic medium and high-grade CNC system is selected, it will bring greater convenience to future operations, programming and maintenance. The selection of the servo drive system is also determined by the performance requirements of the remanufactured CNC machine. If the CNC system and servo drive system supplied by the same company are used, the quality and maintenance of the remanufactured products are more easily guaranteed. Fourth, the design and production of electric control cabinets Because the electrical control function requirements of ordinary machine tools are not the same as CNC machine tools. Therefore, when the machine tool is numerically remanufactured for the old machine tool, the electrical control part of the original machine tool can only be scrapped and redesigned according to the requirements of numerical control remanufacturing. The circuit design of the strong electric control part is mainly based on the functions and control requirements of the input and output interfaces of the numerical control system. Special attention should be paid to the design of the high-power control part of CNC machine tools. The characteristics and forms of the signals of the CNC system must be matched, and the high-power control circuit should be simplified as much as possible during the design process. News link What is machine tool remanufacturing The so-called machine tool remanufacturing is different from machine tool maintenance. It is a remanufactured blank machine with remanufactured value as a remanufactured blank. It is repaired and upgraded with high technology. The remanufactured machine tool obtained can reach or exceed the new technical performance. The level of the machine. Machine tool remanufacturing is also different from machine tool recycling. It is a recycling method that maximizes the use of end-of-life machine tools as a high-level resource. The production cost is much lower than the cost of new machine tool manufacturing. In theory, machine tool remanufacturing is the process of repairing and transforming old machine tools by using high-tech such as advanced manufacturing technology, numerical control and automation technology. The general public's habit of thinking is that everything is new and good, so there is a lack of understanding and understanding of remanufacturing machines, and the quality is not recognized or considered to be second-hand machine tools, and the expectations for remanufacturing machine tools are relatively low. In fact, the machine tool is different from other consumer products, the older the better the stability. In addition, the concept of remanufacturing has not been popularized in the public. Even the leaders of many machine tool manufacturers have no knowledge of remanufacturing, and have caused misunderstandings about remanufacturing. According to industry experts, there are many options for machine tool remanufacturing. The types of machine tools are different, and the content of remanufacturing is different. The requirements of users are different, and the content of remanufacturing will be different. Therefore, the remanufacturing of machine tools requires an in-depth understanding of the structural performance of the original equipment, and a true understanding of the new requirements of the user, combined with the actual structure of the machine tool, in the transformation design. Remanufacturing has a history of more than 50 years in foreign countries. The most notable representative is the remanufacturing industry of automobiles and their parts and components. It has formed a relatively complete manufacturing and service system. In Munich, Germany, BMW has a dedicated recycling and lending center that studies the dismantling and remanufacturing of used cars. In the process of remanufacturing, 94% of scrapped auto parts were repaired by high technology, 5.5% recycled, and only 0.5% were landfilled. In the United States, there are not only national and industry remanufacturing research centers, but also related courses at universities. In 1996, the number of specialized remanufacturing companies in the United States exceeded 73,000, with direct employees of 480,000, producing 46 major remanufactured products. By 2005, US remanufacturing annual sales exceeded $100 billion, while auto parts remanufacturing accounted for 56%. The EU and Japan also attach great importance to remanufacturing products and have enacted laws to encourage the remanufacturing of used cars. However, China's remanufacturing industry started late, and whether it is machine tool remanufacturing or automobile remanufacturing, it is still in the stage of exploration. Therefore, it is extremely necessary to learn from the relevant policies and regulations of the United States and Europe and the industry operation methods. But at this stage, we still have to start from the concept.
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Third, the selection of CNC machine tool auxiliary device In the machine tool numerical control remanufacturing process, the auxiliary device should be selected according to the control function of the machine tool. If the four-way or hexagonal electric tool changer is selected to realize the automatic tool change function, the selection of the tool position is mainly determined by the process requirements of the workpiece to be machined. Since most of the auxiliary devices of CNC machine tools are currently supplied by many manufacturers in China, they can be installed and adjusted according to their product specifications at the corresponding positions of the machine tools. 