Steel ball forging device

The utility model discloses a device for forging a steel ball, which comprises a cylindrical support section and a cake-shaped upsetting section fixed at the lower end of the support section for upsetting, and the upsetting section is provided with a stress reducing mechanism capable of reducing corner angle stress at the upper end of an upset blank. The stress reducing mechanism is an arc-shapedgroove formed in the middle of the lower end of the upsetting section; an arc-shaped groove is formed in the lower end of the upsetting section; during upsetting, the upper end of a forged piece or ablank piece is in a circular arc shape, the situation that the middle extrusion force is extruded to the periphery is avoided, the problem of stress concentration of surrounding edges and corners is avoided, the diameter of the groove is consistent with that of the upsetting section, the width of the groove is two thirds of that of the upsetting section, and the strength is guaranteed while the upsetting effect is guarante