Forging process of yaw variable pitch gearbox flange

The invention relates to a forging process of a yaw variable pitch gearbox flange. The forging process comprises the steps that a bar is selected, a sawing machine is used for cutting needed short bars from the bar to serve as blanks, a pre-forging treatment device is used for treatment, heating is carried out to 1190 DEG C, heat preservation is carried out for 2 hours, upsetting is carried out, and a disc-shaped rough blank is formed; and then the rough blank is punched, a center hole is formed in the rough blank, the rough blank is placed in a forging die, a press machine is used for forgingand pressing to form the process size, a ring rolling machine is used for carrying out ring rolling forming on the hole diameter and the outer diameter of the center hole, and spheroidizing annealingand other steps are carried out after forging. According to the process, internal deformation is uniform, the crystal structure is fine, the strength is high, cracks, folding and other forging defects are effectively eliminat