The setting of simulation parameters is the same as that of mold filling process. After setting, the calculation and Simulation of temperature field is started. The simulation results are shown in figure a-d.
As can be seen from figure a, after the liquid steel has just been filled, the overall temperature of the blade sand mold casting is 1565 ° C lower than the pouring temperature, and solidification will occur at some corners of the blade. This is due to the heat exchange between the liquid steel and the mold during the filling process, resulting in heat loss. At the same time, solidification is easy to occur in places with thin blade thickness; Figure b shows the temperature distribution when solidification is 35%. It can be seen from the figure that the temperature distribution of the gating system and drain edge of the blade sand casting is lower than the solidus temperature of the sand casting material. Solidification has occurred, and the temperature at the riser and riser subsidy is the highest; Figure c and figure d respectively show the temperature field distribution when solidification is 75% and 100%. From the two figures, it can be seen that the upper temperature of blade sand casting is higher than the lower temperature, forming a good temperature trapezoidal distribution diagram, which is conducive to sequential solidification and riser feeding, and the sand casting has fine structure.