Theof hub support is simulated and calculated by using magma simulation software, the shortcomings of the original process and the causes of casting defects are discussed, and the original process is optimized for multiple rounds to eliminate the casting defects of nodular cast iron. The conclusions are as follows:
(1) According to the simulation results of the initial process of nodular cast iron for hub support, it is found that the mold filling process of nodular cast iron is reasonable as a whole. However, in the solidification stage, the riser neck solidified too early and the feeding effect of the riser was insufficient, resulting in many shrinkage casting defects in nodular cast iron.
(2) In order to prolong the solidification time of riser neck and enhance the feeding capacity of riser, the original process scheme is optimized from the perspective of increasing pouring temperature, changing riser height, diameter and riser neck length. It is determined that when the pouring temperature is increased to 1425 ℃, the height and diameter of the riser are increased and the length of the riser neck is shortened, the volume of shrinkage defects in nodular cast iron is the smallest.
(3) Cold iron is added at the thick part of the upper end cover where the feeding of nodular cast iron is difficult, which effectively shortens the solidification time of this part, promotes the solidification of this area and other thin-walled positions at the same time, eliminates large hot spots in this part, and finally eliminates the shrinkage casting defects in the nodular cast iron of the hub support.