Market demand analysis of gear transmission products in China

Release time:

2019-01-17

After nearly 20 years of development, China's gear industry has formed a supporting scale of 10 billion yuan in output value and entered a period of rapid development. It is expected that the market demand for gear transmission products in China will double in the next 10 years. Gears and gear products are important basic parts of mechanical equipment, and most of the main transmission parts of mechanical equipment are gear transmission. Therefore, to some extent, China's gear industry is the foundation of China's machinery industry, and the development of the gear industry plays a vital role in China's machinery industry. 1. development status of China's gear industry is basically composed of three parts: industrial gears, vehicle gears and teeth.

Gears and gear products are important basic parts of mechanical equipment, and most of the main transmission parts of mechanical equipment are gear transmission. Therefore, to some extent, China's gear industry is the foundation of China's machinery industry, and the development of the gear industry plays a vital role in China's machinery industry.

1. development status

China's gear industry is basically composed of three parts: industrial gears, vehicle gears and gear equipment. Among them, the market share of vehicle gears reaches 60%; industrial gears are composed of industrial general, special and special gears. Its market share is 18%, 12% and 8% respectively; gear equipment accounts for 2% of the market share.

2. factors restricting the development of gear industry

However, compared with foreign countries, there is still a big gap between China's gear industry: it is still far from the modular design of gear transmission devices, the technical performance of gear transmission devices cannot catch up with advanced countries, the level of gear dynamics analysis software is not high, the product standards are not in line with international standards, the quality of domestic steel is unstable, and the enterprise technology and equipment are backward, there are many problems, such as low level of information technology, low level of overproduction, disorderly competition, repeated introduction and serious dependence on foreign technology.

At this stage, the gear industry should improve the industry concentration through market competition and integration, and form a group of large, medium and small-scale enterprises with assets of billions of yuan, 0.5 billion yuan and 0.1 billion yuan. Through the design and development of independent intellectual property products, a group of leading enterprises of vehicle transmission system (gearbox and drive axle assembly) will be formed, and the capabilities and resources of the gear industry will be integrated with the supporting capabilities of the leading enterprises. Realize specialized and networked matching, form a large number of distinctive processes, distinctive products and brand-name enterprises with rapid response capabilities; through technological transformation, realize the transformation of modern gear manufacturing enterprises.

3. Gear Trend

Internationally, gear units are developing in the direction of miniaturization, high speed and standardization. The application of extraordinary gears, the development of planetary gear devices, and the development of low-vibration and low-noise gear devices are some of the characteristics of gear design. In order to achieve the purpose of miniaturization of the gear device, the bearing thrust of the existing involute gear can be improved. The hard tooth surface technology is widely used in various countries to increase the hardness to reduce the size of the device; it can also be applied to the special tooth shape represented by the circular arc gear. The main transmission system of the shipborne helicopter developed by Britain and France adopts circular arc gears, which greatly reduces the height of the reducer. With the trend of replacing ship power by medium-speed diesel engines, the use of high-power planetary gear devices on large ships is indeed effective; now in large-scale transmission devices such as metallurgy, mines, and cement mills, planetary gears are used for their small size and good coaxiality., The advantages of high efficiency are more and more.

1. Gear manufacturing process

The development of gear manufacturing process is largely reflected in the improvement of precision grade and production efficiency. Since the 1970 s, the manufacturing accuracy of various gears has generally increased by one level or so, and some even have 2 to 3 levels. Generally, the accuracy of low-speed gears has been increased from 8 to 9 levels in the past to 7 to 8 levels. Machine tool gear from 6~8 level to 4~6 level. The gear of rolling mill has been improved from grade 7~8 to grade 5~6. For small and medium-sized gears with small modulus, due to the development of high-performance gear hobbing machines and the improvement of tool materials, the gear hobbing efficiency has been significantly improved. With a multi-head hob, the achievable cutting speed is 90 m/s under high feed and conditions. Such as the use of super hard hob processing modulus of 3 or so of quenched and tempered steel gear, excessive cutting up to 200 m/s. The improvement of gear shaping efficiency is limited by the reciprocating motion mechanism of the gear shaping machine tool. Recently in the development of the use of tool unloading, the use of hydrostatic bearings, enhanced tool holder and column rigidity and other new structures, the efficiency has been significantly improved. The number of strokes of the new gear shaper can reach 2,000 times/min.

2. Steel for gear

The development trend of gear steel; one is low alloy steel containing Cr,Ni,Mo. Due to the lack of Ni and Cr in China, 20CrMnTi carburizing steel is commonly used or boron-containing rare earth steel is used. Heavy machinery commonly used 18CrMnNiMo carburized steel or medium carbon alloy steel. Machine tool industry edible 40Cr,38CrMoAl steel and high-speed gear with 25Cr2MoV steel nitriding.

3. Information trends

People can use computers to calculate, analyze and compare all kinds of possible designs, and obtain ideal results through optimization. For example, in the analysis of the contact zone of the tooth surface, the calculation of the angle between the meshing line and the relative velocity, the calculation of the elastic lubrication and the calculation of the geometric parameters are programmed. Also, there are programs for gear modification calculations and gear load capacity calculations. China has developed a program software to GB3480-83 the standard for calculating the load capacity of involute cylindrical gears for production applications. In gear machining, the entire cutting process can be controlled by computer. Make the manufacturing quality stable and reliable. At present, the domestic research on the application of microcomputer to spiral bevel gear cutting adjustment card for calculation, processing deviation can be adjusted in a timely manner. So that the tooth surface contact to achieve a more ideal position, and greatly improve the efficiency. In addition, according to the principle of numerical control, the parabolic modification of the spiral tooth surface of the torus worm by microcomputer has been applied to production. Although the work in this area is still in its infancy in China, it is of great significance to improve the quality and technical level of gear manufacturing.

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