Machine Tool Remanufacturing Brings CNC System Business Opportunities

In the tide of financial storms sweeping the world, the new machine tool market is rapidly declining. Some machine tool manufacturers have begun to quietly shift their target to the remanufacturing field. As a major part of the remanufacturing of machine tools and the improvement of performance accuracy, the remanufacturing of CNC machine tools at the present stage has a more important significance.

Although China's machine tools currently hold nearly 7 million units, it has become the world's largest machine tool holder, but the overall level of machine tools is still relatively backward. Many products before the 1980s are still in overdue service, and it is difficult to meet the requirements of machining accuracy. . According to statistics, at present, China's machine tools with more than 10 years of service account for more than 60%. These machine tools may face overhaul or even functional scrap or technical elimination in the next 5 to 10 years, resulting in considerable recyclable potential for remanufacturing. Resources.

CNC remanufacturing can be a “working machine” represented by CNC machine tools. It is the crystallization of digital control technology and precision manufacturing technology, and is a typical representative of advanced manufacturing equipment. In recent years, although high-precision machine tools, CNC machine tools, and large-scale machine tools have grown rapidly, the share of machine tools in the 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 statistics provided by the China Machine Tool and Tool Association, from 2000 to 2006, China's equipment manufacturing plant produced a total of 290,400 CNC equipment, exported about 30,000 units, domestic sales of 260,400 units, and imported 22,000 CNC equipment. In 2007, more than 120,000 CNC machine tools were made in China. In addition, during the “10th Five-Year Plan” period, about 100,000 digital control devices were renewed and rebuilt, plus about 90,000 CNC devices were maintained in China before 2000. It is estimated that the number of CNC equipment currently in use in China is about 700,000 units.

At present, the numerical control rate of China's machine tools is increasing year by year. According to statistics, the numerical control rate in China has increased from 3.2% in 1992 to 13.3% in 2005. However, compared with the numerical control ratios of 60% to 70% of production in Japan, the United States, and Germany, and the numerical control of the output value of 80% to 90%, the numerical control rate of China's machine tools is still too low.

Since the 1960s, many major engineering projects in China have imported and manufactured a large number of large-scale and heavy equipment. The mechanical parts of these machine tools have been used and maintained for many years and have a good stability. The transformation of the numerical control transformation of heavy-duty and large-scale machine tools has saved more money and is particularly 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 10-30 years, their mechanical bodies and precision are kept intact, and the electrical parts such as CNC systems are severely aged and urgently needed to be transformed.

While foreign spare parts have been discontinued, it is difficult to buy them. If the CNC system is completely transformed into a new foreign system is very expensive, even if the transformation, because the replacement of foreign numerical control system is fast, 10 years may not be replaced by 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 accuracy of the stepping system and the loss of steps, the system is not reliable. Now, many of these machine tools need to be replaced.

The NC remanufacturing of ordinary machine tools and aging CNC machine tools can not only achieve the same effect as the acquisition of new machine tools: improving the quality and productivity of parts processing, shortening the product manufacturing cycle and improving the working environment; but also reducing capital investment and purchasing Compared with the new machine tool, it can save more than 50% of the funds. For example, the price of an economical numerically-controlled remanufactured machine tool is only 1/5 to 1/3 of the same function of a new CNC machine tool.

In short, under the current economic situation, CNC remanufacturing of machines is of great significance at this stage in China, which can greatly save equipment investment, obtain advanced CNC machine tools at a small price, and improve processing efficiency and processing quality; Improve the company's existing machine tool performance, and effectively improve the company's processing and manufacturing capabilities. 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.

The CNC system ushered in opportunities. A specific machine tool The main tasks of CNC remanufacturing engineering include mechanical and electrical transformation. The main tasks are: restoration and improvement of machine tool mechanical precision, recovery and improvement of movement accuracy, numerical control system and servo The selection of the system, the selection of the auxiliary device, and the debugging of the complete machine, the inspection of the machine tool and other aspects. Among them, the selection and use of CNC systems and servo systems are the key to directly affecting project benefits. Several items of CNC remanufacturing are briefly described as follows:

First, the accuracy of recovery and mechanical transmission part of the improvement of the use of random bed service age, the machine's mechanical transmission components, such as rails, screws, bearings, etc. have varying degrees of wear. Therefore, the primary task in the remanufacturing process of the machine tool is to perform similar machine tool overhaul on the machine tool so as to restore the machine tool accuracy and achieve the new machine tool manufacturing standard. Therefore, the machine tool NC remanufacturing can be combined with the overhaul of the machine tool, but the machine tool The requirements of CNC machine tool accuracy are different from those of ordinary machine tools, that is, the restoration of the accuracy of the entire machine tool and the improvement of the mechanical transmission part must be performed to meet the structural characteristics of CNC machine tools and the requirements of CNC automatic machining. Features batch overhaul.

Second, the selected numerical control system and servo system According to the numerical control remanufacturing machine tool control function request, chooses the appropriate numerical control system is very important, directly decided the machine tool numerical control remanufacturing the success or failure. As the CNC system is the command center of the entire CNC machine tool, besides considering various functions to meet the requirements when selecting, it is also necessary to ensure the reliability of the system. It is generally selected in terms of cost-performance ratio, and appropriate consideration is given to such matters as after-sales service and maintenance. If you choose domestic-made high-grade CNC system, it will bring greater convenience to future operations, programming, maintenance and so on. The selection of the servo drive system is also determined by the performance requirements of remanufactured CNC machine tools. If the numerical control system and servo drive system supplied by the same company are used, the quality and maintenance of remanufactured products are more easily guaranteed.

Third, the selection of CNC machine tool auxiliary device In the CNC machine tool remanufacturing process, according to the control function of the machine tool to select the auxiliary device. If the square or hexagonal electric tool change rack is selected to realize the tool automatic conversion function, the number of tool bits is mainly determined according to the process requirements of the workpiece being processed. As 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 on the machine tool.

Fourth, the design and production of electronic control cabinet As the general machine tool electrical control function requirements and CNC machine tools are not the same. Therefore, when CNC machine tools are remanufactured on an old machine tool, the electrical control part of the original machine tool can only be scrapped and redesigned according to the requirements of NC remanufacturing. The circuit design of the power control part is mainly based on the functions and control requirements of the input and output interfaces of the numerical control system. In the design of the strong electric control part of CNC machine tools, special attention should be paid to the fact that the characteristics and form of each interface signal of the numerical control system must match, and the strong electric control circuit should be simplified as much as possible in the design process.