Driven by the rapid development of automobile industry, China’s automobile gear manufacturing industry shows sustained and rapid growth. According to the preliminary statistics of 56 major domestic automobile gear enterprises, the annual output of automobile gears has exceeded 80 million pieces, and China has become a large automobile gear production country.
Gear processing technology is a key technology in automobile gear manufacturing. At present, the equipment of Chinese gear manufacturing enterprises has been close to the international advanced level. Under this condition, in-depth research on automobile gear processing technology plays a positive role in rapidly improving China’s automobile gear manufacturing level and developing China from a large automobile gear manufacturing country to a powerful automobile gear manufacturing country.
Gear hobbing has the technical characteristics of high productivity and good universality. It is the most widely used gear processing technology at home and abroad. The number of gear hobbing machines in some major gear producing countries accounts for about of the total number of gear processing machines. The backbone enterprises of automobile gear production in China generally adopt gear hobbing technology. With the development of automobile industry, gear hobbing technology plays a more and more important role in automobile gear manufacturing.
The automobile drives a large inertial system. The automobile gear should ensure not only the macro transmission ratio, but also the micro transmission ratio. If the machining accuracy of the tooth surface shape of the automobile gear can not meet the requirements of constant instantaneous transmission ratio, it is very easy to cause high-frequency vibration in the driving of the automobile, which directly affects the running quality of the automobile. Because the hobbing cutting process is relatively complex and sensitive to the machining conditions, the radial error and tangential error of automobile gear caused by the change of the relative position and relative motion of hob and cut gear have a great impact on the manufacturing accuracy and transmission accuracy of automobile gear, which has become one of the key problems to be solved in automobile gear manufacturing.
According to the reality of gear hobbing processing in automobile gear manufacturing enterprises, the research on gear hobbing cutting mechanism, machining accuracy and process parameters can not only significantly improve the manufacturing quality and production efficiency of automobile gears, but also improve the working performance and bearing capacity of automobile, which has high theoretical research and practical application value.
At present, China’s automobile gear manufacturing enterprises with an annual output value of more than 50 million yuan have an annual total output value of 18 billion yuan. Among them, 11 key automobile gear production enterprises with an annual output value of more than 500 million yuan, such as Harbin gearbox factory, have an annual total output value of 12.5 billion yuan. The annual export of gear products of five automobile gear manufacturers including Shanghai Automobile Gear General Factory alone reaches US $100 million. China’s automobile gear industry is accelerating its participation in global procurement and international supporting.
In the process of automobile gear processing and manufacturing, gear hobbing is an important process widely used. It is directly related to the final accuracy and production efficiency of automobile gear. Because gear hobbing is a complex spatial motion and involves many interactive factors such as gear hobbing cutting principle, hob design, gear hobbing parameter selection and so on, it is necessary to explore the above problems, In order to improve the working efficiency and machining accuracy in the actual machining process. It is of great practical significance to promote the rapid development of China’s automobile gear manufacturing industry.