The metal velocity vector diagram of each stage in the forging process ofblank is shown in the figure. Because the numerical simulation of spiral blank die forging process is based on the numerical simulation of upsetting process, the numerical simulation of die forging process starts from step 439. Figure (a) shows the metal flow velocity vector diagram of step 11 of the die forging process and step 450 of the total simulation, figures (b) to (E) show the metal flow velocity vector diagram of the intermediate process, and figure (f) shows the metal flow velocity vector diagram when the die forging is completed.
When the die forging of spiral bevel gear blank begins, the metal in contact with the upper die begins to undergo plastic deformation. As the upper die is continuously pressed down, the metal fills the die cavity. When the die cavity is filled, the metal begins to flow to the flash groove until the die forging process is completed.