The position of the split surface of the helical gear is determined by the distance between the male die and the female die. The research is to form the helical gear by using the double split precision forging process. Therefore, the metal material will flow in three directions during the filling of the die cavity. Firstly, it will flow radially along the split gap between the male and female, forming internal and external flash, which is affected by the friction resistance at the split gap, The metal material flows axially to the tooth cavity of the female die to form a spiral tooth shape. In the forming process, the position of flash formation corresponds to the position of the shunting surface.
The position of the helical gear split surface is determined by the die structure. The relative height of the upper and lower die cores determines the split position of the inner split surface, and the relative position of the upper and lower dies determines the forming position of the outer flash. The DEFORM-3D finite element simulation software is adopted. The three-dimensional finite element model established by UG is used. In the modeling process, the upper die and the upper die core are regarded as a whole, and the lower die and the lower ejector rod are regarded as a whole. The trim tool in UG three-dimensional software is used to modify the relative height of the upper and lower die cores and the relative position of the upper and lower dies, so as to change the overall structure of the die, conduct numerical simulation and analyze the simulation results, Find out the relevant laws.
Firstly, the positions of different internal shunting surfaces of helical gears are selected for numerical simulation, the simulation results are analyzed, the influence law of different internal shunting surface positions of helical gears on metal forming is obtained, and the best position of internal shunting surface is determined. Then, by changing the relative position of the outer split surface of the helical gear, the finite element numerical simulation is carried out, and finally the best position of the outer split surface of the helical gear is determined.