According to the production practice of spur gear, the elastic deformation in the forming process of spur gear blank is far less than its plastic deformation. In order to facilitate the finite element simulation analysis and calculation and subsequent theoretical analysis, ignore the elastic deformation in the forming process of spur gear blank and the temperature change in the forming process, and regard it as a rigid plastic body. Its finite element solution formula meets the balance equation, geometric equation and volume invariable conditions.
Parameter setting of spur gear rotary forging: the rotation speed of the swing head is 298r / min, and the feed speed of the lower die is 5mm / s.
Forming temperature: room temperature 20 ° C, ignoring the temperature effect;
Friction factor: the blank is phosphatized and saponified before rotary rolling and lubricated with MoS2 powder. The friction factor is m = 0.12.
Spur gear material: gear steel 42CrMo. As shown in the figure, the relationship curve between flow stress and equivalent strain and strain rate is given.