The defects in the forging process of helical gear are shown in the figure. In the process of helical gear forging simulation, due to the closed die forging, the tangential deformation, stress and strain are also large; When the blank is filled into the tooth groove, due to the large friction and deformation at the tooth root circle, the equivalent stress and equivalent effect variation are the largest at this place, and the defect of insufficient filling of cavity materials is caused because the helical gear, as shown in figure (a); In the height direction, because the blank is squeezed downward by the punch and the metal flows downward along the height direction, the deformation of the blank in the height direction is small, and the stress and strain values are small. In particular, a special circular low stress and low strain area is formed on the upper surface in contact with the punch, and because the mesh is too large during stress, It cannot be well filled, resulting in many burrs and flash, as shown in figure (b).
