During the “Twelfth Five-Year Plan†period, large gears and transmissions were listed as development priorities, and the processing technology of large gears will be rapidly improved and developed. Then, what is the current status of large-scale gear processing, and what kind of demand for large-scale gear processing technology for machine tools, tools, and test equipment? The metal processing online reporter interviewed Dr. Shi Zhaoyao, a well-known expert in the gear industry in China and a professor at Beijing University of Technology.
Chinese gear industry expert, professor of Beijing University of Technology Shi Zhaoyao
Professor Shi first began to patiently explain the development of gear technology from the three elements of the gear (tooth profile, materials and processing methods). After more than 3,000 years of evolution, the gear tooth profile has evolved from a straight line to a complex curve now dominated by involute; gear materials have evolved from raw wood to various high-performance materials now dominated by steel; It has also evolved from hand-made and foundry to high-efficiency machining, which is now dominated by metal cutting. The change of each element reflects the advancement and development of gear technology, which greatly enhances the performance of gears.
Although the gear has a long history, the true gear technology began in the 19th century. After theoretically recognizing the superiority of the involute, the appearance of hard steel cutters has made the casting gears of thousands of years history, thus laying a modern The basis of gear processing technology; the invention of gear hobbing machine and gear shaping machine based on the principle of exhibition in the late 19th century solved the problem of mass production of high-precision gears and met the huge demand for gears in the development of automobiles. For more than 100 years, materials and manufacturing technology have been the main drivers of the rapid development of gear technology.
China's gear industry has experienced rapid development for more than 20 years. The first 10 years have benefited from the development of vehicle gears. In recent years, it has originated from the development of industrial gears based on wind power gears. According to the statistics of China Gear Industry Association, the output value of the whole industry in 2000 was 24 billion yuan, and in 2008 it was 100.2 billion yuan, with an average annual growth rate of 20%. In 2011, the output value of the whole industry reached more than 160 billion yuan. China has become a big country in gear production, but it is not a gear power. The overall technical level of the gear industry is only equivalent to that of developed countries in the late 1990s.
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