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Development of linear guide and ball screw in China

PostTime: 2018-9-5 15:40:08    Views: 2534

China's rolling functional parts industry has become the bottleneck of the development of domestic CNC machine tools because of its decentralized production, single product varieties, low gold content and no internationally influential well-known brand. Therefore, it is necessary to accelerate the industrialization of rolling functional components in China.

Products of rolling functional parts include: ball screw pair, rolling linear guide rail pair, ball spline, ball guide sleeve, linear motion parts, coordinate workbench, self-locking device, etc. Characterized by "rolling", they have the functions of high efficiency and energy saving, precise positioning, precise guidance, rapid response to CNC commands, high speed, synchronization and reversibility of transmission. They are irreplaceable key accessories for CNC machine tools and mechatronics products, as well as important basic components that meet the ecological and environmental protection concepts of the 21st century. Although their products are small, they integrate many key technologies of precision parts manufacturing. Because of their high degree of standardization, serialization and generalization, and broad market, they are very conducive to organizing professional mass production.

Industry status

At present, there are 50 rolling function parts manufacturing enterprises in China (excluding Taiwan Province), 3 research institutes and universities, and 3 enterprise affiliated research institutions. There are 48 enterprises producing ball screws, with an annual output value of 650million yuan, and 6 enterprises producing rolling linear guide rails (four of which produce ball screws at the same time), with an annual output value of 150million yuan. Among the 50 enterprises, there are 6 enterprises with large production scale, complete process equipment, large output and many varieties, and the vast majority of the remaining enterprises are small in scale, low in output and single in product variety.

Domestic rolling functional components have been applied in many fields in the equipment manufacturing industry, ranging from "Fengyun-2" satellite, missile guidance system, space transmission device of space capsule, radar device, airport equipment, to all kinds of CNC machine tools, it industry, metallurgical equipment, railway vehicles, nuclear power plants, plastic machinery, medical devices, etc.

From a global perspective, although China's rolling functional component industry is the country with the largest number of manufacturers, its production is not concentrated, its distribution is unreasonable, and its total output and output value are not high. Except that some products of a few key backbone enterprises reach or approach the foreign level, most enterprises can only produce medium and low-grade products, with a single variety and low gold content. So far, there is no internationally influential well-known brand or listed company.

The main gap between China's rolling functional component industry and foreign countries is: the professional production level is not high; Information management lags behind; The industrialization process is slow; Personalized services can't keep up. From the overall level of products, we are below the famous brand products of developed countries and above the middle and upper level of developing countries. The gap between medium and low-grade products and similar foreign products is small or basically the same, but the production efficiency is far lower than that of foreign countries. However, there is a significant gap between high-performance and high-grade products (high-speed, high-precision, ultra-high precision, low noise, etc.) and well-known enterprises such as NSK, THK, Rexroth, etc., which has become a bottleneck restricting the development of domestic high-grade CNC machine tools.

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