What does stainless steel precision casting holes prevent?

Stainless steel precision casting is a forging process with less or no drilling. It is a production process in the foundry industry and its application is very common. What is the prevention of stainless steel precision casting holes?

The actual situation of stainless steel precision casting pores is as follows:

1. The poor air permeability of the architectural coating may be due to insufficient negative pressure, poor air permeability of the sand filling, and the inability to immediately discharge the steam and residue in the concave mold.
2. The pouring speed of the stainless steel casting gate is very slow, the rubber cup cannot be filled, the sprue is exposed, gas is involved, slag is sucked in, and carbon steel series-water glass forms carrying holes and slag holes.

3. The gasification and splitting of the foam model turns into a lot of steam and residue, which cannot be discharged immediately. The tedious process of adding dry sand to the paint layer is not good.

4. Due to the unscientific overall planning of the pouring system, the filling rate of the metal liquid exceeds the foam gasification compromise and steam emission rate, and the gasification residue crushing balls form soot-black holes in the inner cavity in the metal liquid.

5. The joint sealing performance between the inlet cup, the sprue and its pouring management system is poor, especially the joint sealing between the sprue and the inlet cup.

6. The particle size distribution of the molding sand is too fine, the smoke content is high, the air permeability is poor, and the negative pressure pipe is blocked, causing negative pressure frame loss.

7. The deamination of molten steel is not good. The slag discharge in the stove, furnace and bag is not clean, the time is too short, the slag retaining is not in place during the entire pouring process, and the snail pump pouring valve attachment technology is unscientific, forming slag holes.

8. The pouring temperature is low, and the metal material liquid filling the Z front cannot fully vaporize the foam plastic, and the remaining chemicals cannot float to the outlet and solidify to form pores in the casting.