Scheme 1
According to the simulation results in Fig. 1 (E), the whole filling process takes about 19.6 s, which is basically consistent with the calculation results. It can be seen from 1 (a) that the transition zone of the ingate near the sprue is insufficient, and 1 (b), (c) and (d) show that the flow velocity of the liquid steel at this place is large, and the impact on the sand core is large, which may cause defects such as sand inclusion.
Scheme 2
Scheme 2: according to the simulation results in Fig. 2 (E), the whole filling process takes 19.7 s, which is basically consistent with the calculation results. After changing to one side pouring, the filling process is more stable than scheme one. Because the ingate is facing the sand core and the ingate is close to the sprue, the defect of scheme 1 may still appear.
Scheme 3
From the simulation results of filling time in Fig. 3 (E), the whole filling time is about 21.1 s, which is basically consistent with the calculation results. The filling time of the parts with the same color in the figure is the same, and the same color of the whole casting presents zonal distribution, which indicates that with the bottom injection gating system, the liquid steel filling in the mold cavity is stable and layer by layer. It can be seen from the figure that the flow rate of molten steel is about 0.426 ~ 0.850 m s during the mold filling process of the casting, and the molten metal meets without splashing
