The spiral bevel gear is one of the important parts of the main reducer of the rear axle of the automobile, and plays an important role in bearing the load in the transmission process of the automobile. As the production of automobiles increases year by year, the demand for spiral bevel gears also increases year by year. The blanks used for this type of gear machining are required to be of high quality and to save energy and material in mass production. Therefore, optimizing the existing blank forming process, improving the quality, reducing the cost and reducing the noise has become an important research direction in the automotive industry. The main research contents of this topic are as follows:

1. The various forming processes of gear blanks were compared and analyzed, and the forming process scheme suitable for the gear blanks of this subject was obtained.

2. Theoretical calculation of blank size, forming die and equipment selection of closed die forging, single-piece ring rolling process and double-piece ring rolling process is carried out, and the process plan for forming helical bevel gear blank is determined through comprehensive comparison.

3. Use the DEFORM-3D finite element numerical simulation software to carry out numerical simulation experiment verification and optimization of the ring rolling forming process, and determine the optimized shape and size of the preform required for ring rolling.

Fourth, on the basis of the single-piece ring rolling forming process, the numerical simulation of the double-piece ring rolling forming is carried out, and the simulation experiment results are analyzed and explained.

This paper compares two forming processes of driven helical bevel gear blanks, namely closed die forging process and ring rolling process. The material utilization rate of the two forming processes is calculated respectively, and the comparison results show that the material utilization rate of the ring rolling process is improved compared with the closed die forging process. By comparing the equipment used and energy consumption, the closed ring rolling forming process is finally selected as the process plan for forming the gear blank.

On the basis of the single-piece ring rolling process, the numerical simulation of the double-piece ring rolling forming process is carried out. Through the analysis of the stress-strain distribution, geometric shape and forming size during the forming process, it is shown that the stress-strain distribution law is roughly the same as that of the single-piece ring rolling deformation process. Consistent, and the geometry and forming dimensions meet the requirements. Through the comparative analysis of the material utilization rate of single-piece and double-piece ring rolling, it is concluded that the material utilization rate of the double-piece ring-rolling process is improved compared with the single-piece ring-rolling process, and the production efficiency is improved and the cost is reduced. The proposal of this process provides an important theoretical basis for future production practice.