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Casting is a forming method of smelting metal, manufacturing mold, pouring molten metal into a mold, and obtaining metal parts blank with a certain shape, size, and performance after solidification.
Sand casting is a casting method that uses a sand mold to fill molten metal into the mold under the action of gravity.
The ability of a tight sand mold to let gas escape through it is called permeability.
Under the thermal action of liquid metal, the mold produces a lot of gas. If the sand mold and sand core do not have good exhaust capacity, choking may occur during the pouring process, resulting in defects such as pores and pouring failure.
On the one hand, the exhaust capacity of the sand mold depends on the riser and penetrating or nonpenetrating air outlet, on the other hand, it depends on the permeability of molding sand.
There are many factors affecting air permeability, mainly including:
It should be noted that it should not be misunderstood that the higher the permeability of molding sand, the better because it shows that the larger the diameter of the sand gap, the liquid metal is easy to penetrate the pores between sand particles, resulting in rough casting surface and mechanical sand sticking.
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