The die forging process of helical gear studied adopts closed die forging process, which is divided into two processes: blanking and final forging. The single die bore structure is adopted, so the forming process of helical gear is relatively simple, which is easy to carry out relevant forming analysis. Although the heat transfer rate between the blank and the helical gear forging die is relatively low, in order to obtain more accurate data and more scientific analysis, the influence of the heat transfer between the blank and the die and the temperature heat effect in the forging deformation on the forming needs to be considered in the numerical simulation of helical gear forging in this paper.
The billet temperature of helical gear is treated at different levels, and the temperature of punch, die and sleeve is set to 65 ℃. The dimension and specification of helical gear cylindrical blank shall be 35mm × 20mm, the outer diameter of the cylindrical blank is close to the tooth root circle, which is conducive to the blank filling in the helical gear forming process. The initial cylindrical blank shape and the forging shape after closed die forging of helical gear are shown in the figure. The forging die design of the cylindrical helical gear adopts the closed die forging process. Compared with the traditional machining process, it can shorten the production cycle and improve the production efficiency. Moreover, the gear forging has high surface quality, good wear resistance, corrosion resistance and fatigue resistance.