In view of the problems of high pouring temperature and easy decay of inoculant in lost foam Castings, it is decided to use the inoculant with high melting point and slow decay plus ordinary inoculant for many times to achieve the best inoculation effect.
At the same time, according to the different inoculation effects and anti recession effects of different inoculants, it is decided to use composite inoculants and add ferrosilicon, silicon barium and silicon barium calcium inoculants in a certain proportion, which are called the first inoculant, the second inoculant and the third inoculant respectively.
The addition amount of the first inoculant is 0.15%. 20s after the spheroidizing reaction, sprinkle the second inoculant with the weight of 0.35% ~ 0.45% of the molten iron in the spheroidizing package, and then sprinkle the third inoculant with the weight of 0.2% ~ 0.4% of the molten iron. By adding three times, the inoculation effect is improved, the incubation decay time is delayed, and the graphite deformity and the amount of non spherical graphite are reduced, which is conducive to improving the quality of castings.