How can foundry manufacturers solve the problem of sand trapping in castings?


Time:

2023-06-26

How does sand trapping occur? During the pouring process, the scouring and baking effect of high temperature metal liquid makes the water in the sand evaporate and the volume expand at the same time, which causes the surface layer of the sand to buckle or crack, thus the phenomenon of sand trapping occurs. There are three main forms of sand trapping, namely, "sand trapping scar", "rat tail" and "groove". On the surface of the casting part, it is mainly manifested as scar-like projections, fine lines with sand and striped grooves.

How can foundry manufacturers solve the problem of sand trapping in castings?

How does sand trapping occur? During the pouring process, the scouring and baking effect of high temperature metal liquid makes the water in the sand evaporate and the volume expand at the same time, which causes the surface layer of the sand to buckle or crack, thus the phenomenon of sand trapping occurs. There are three main forms of sand trapping, namely, "sand trapping scar", "rat tail" and "groove". On the surface of the casting part, it is mainly manifested as scar-like projections, fine lines with sand and striped grooves.

How to solve the sand trapping problem? Improve the sand hot wet tensile strength and large sand yielding, improve the sand treatment optimization process; increase the stress relief groove and anti-sand nail in the large plane to avoid the problem of sand trapping in the large plane; optimize the pouring system to reduce the direct impact of high temperature metal liquid on the sand.