Forging of spiral bevel gear blank

Spiral bevel gear, also known as spiral bevel gear, spiral bevel gear, spiral bevel gear and so on, is a kind of transmission part that can drive stably and with low noise according to stable transmission ratio. Spiral bevel gear has the characteristics of high transmission efficiency, stable transmission ratio, large arc overlap coefficient and high bearing capacity. It is widely used in automotive, aerospace, engineering machinery and other industries.

The theory of spiral bevel gear was first put forward by wildhaber and others of Gleason company in the United States. Later, Klingeinberg company in Germany and Oerlikon company in Switzerland also mastered the technology of producing spiral bevel gear. Gleason adopts circular arc tooth system, while Klingeinberg of Germany and Oerlikon of Switzerland adopt extended epicycloid tooth system. Most of the spiral bevel gears and hypoid gears made by Gleason of the United States are used in China. The difference between the two is that; There is no offset between the spiral bevel gear pinion shaft and the big axle, while the hypoid gear pinion shaft and the big axle are offset by a certain distance, which can make the transmission more stable, reduce noise and be suitable for high-speed movement.

In recent years, with the rapid development of automobile, engineering machinery and other industries, the demand for the variety and quantity of spiral bevel gear products is increasing. As the core component of mechanical equipment industry, the manufacturing level of spiral bevel gear represents the development level of a country’s mechanical equipment industry to a certain extent.

Forging is one of the main ways of manufacturing spiral bevel gears. The forging of spiral bevel gears can be roughly divided into two types: hot forging of gear blanks (to prepare for subsequent machining) and precision forging of gears. Because of the importance of spiral bevel gear in mechanical equipment industry, it is necessary to study the forging of spiral bevel gear.

In recent years, with the development of computer technology and metal plastic forming theory, finite element numerical simulation technology has been more and more applied in metal plastic forming. The finite element numerical simulation technology can be used to simulate the plastic deformation process of metal in the gear forging process, and the metal flow law, the distribution of stress, strain, displacement, velocity and temperature in the deformation process can be obtained; It can be observed whether the material is folded during the forging process, and whether there are defects such as cracks and insufficient filling; It can be observed whether the final shape of the forging is consistent with the actual forging. In addition, the stress of the die in the forging process can be obtained, so that the strength and stiffness of the die can be checked. The obtained information can provide technical guidance for the design of forging die and the research of forging process. Using finite element simulation technology can greatly shorten the product development cycle, reduce the development cost, improve the product quality, and then improve the competitiveness of enterprises.