Selection of aluminum alloy gravity cast housing

Aluminum alloy gravity casting can be divided into two types, one is multi-layer, the other is solid, but the most used on the market is multi-layer. Aluminum alloy castings, in the process of use, the module is first immersed in the refractory material, and the refractory material is hardened and dried on the object of the module. This must be repeated several times until the thickness of the refractory coating is up to standard. This is the composite material mentioned above. The shell process is then left on hold for a period of time so that it is fully hardened and can be melted, thus completing the effect of a multi-layer shell.

Aluminium alloy casting

In the gravity casting of aluminum alloy, in fact, most of the multi-layer shells need to be filled with sand and filler, and only a few do not need to be filled with sand and filler, as long as the simple baking can be poured into shape. When we use investment casting, we lose it. In general, because the volume of the investment mold will increase, during the baking and pouring process, the various parts of the shell will control each other, but it is unlikely to expand and contract evenly. This may be due to the chemical action of the material and relatively high temperature of the metal casing. React. This means that due to the mechanical strength, temperature, heat resistance and vibration resistance of the refractory, as well as the chemical stability at high temperatures, there are still certain requirements for the performance of the housing, such as the shrinkage and expansion of the size. Therefore, the shell must also have a certain permeability, so that the inner shell does not exclude gas when pouring. These are closely related to adhesives and refractories as well as enclosures used in the manufacturing process.