Everything You Need to Know About Permanent Mold Casting

In the process of permanent mold aluminum casting, into the steel die the molten metal is poured and it flows only at the force of gravity. For the maximum part, by pouring the molten metal into the top of a die that has been made in the desired shape of the casting permanent mold castings are produced. In actual casting practice, there are many deviations from this simple approach.

Sometimes at the top, the metal is poured into the mold, but into the die that conveys the molten metal to the side or bottom of the casting cavity itself a runner is cut, so that during filling the metal flow is from the bottom or side of the mold. This is performed to optimize casting conditions for the part that is being produced.

At different times by permanent mold casting aluminum manufacturer to achieve controlled filling of the mold the metal may be poured into a basin beside the die and then the entire unit is tilted. Two of the main criteria for successful casting production by the permanent mold process are the flow of metal into the die cavity and the flow of heat from the metal to the die during solidification.

From hardened steel dies for the permanent mold process are produced. Compared to ceramic molds the heat transfer rate is higher and is used in other processes and in casting cycle time this provides advantages.

You will find that in the casting that cannot be produced with conventional steel dies; the casting design requires undercuts or hollow cavities. In these cases, for the permanent mold process, the die designer may choose a loose piece or an expendable core. Semi-permanent mold casting is referred to as a process when there is the use of expendable cores.

The benefits of the permanent mold casting aluminum and semi-permanent mold casting processes are reasonable piece costs achieved from the high production rates with metal molds (especially water-cooled molds) when compared to sand and investment casting, and when compared to low-pressure and high-pressure die casting there is the lower investment required for equipment. In the semi-permanent mold, casting the use of expendable cores permits great design flexibility for castings.