How to Make Shells for Stainless Steel Precision Castings

The production process of stainless steel precision castings is more complex, and the requirements for dimensional accuracy are high. There are three main shell-making processes for stainless steel precision castings, namely water glass process, silica sol process and silica sol composite process. Let's introduce them one by one.

1. Compared with the silica sol shell, the water glass shell retains the water glass binder, so the overall high temperature strength, deformation resistance and dimensional accuracy of the cast are lower than that of the silica sol shell. The surface of castings produced by the water glass process is relatively rough, and there are many defects such as sand hole and shrinkage porosity. However, its production cost is low, so most foundries will choose this process for casting production.

2. The castings produced by the silica sol process have high dimensional accuracy, high surface finish and precision, which is suitable for the production of high-quality precision castings, but the cost is high.

3. The silica sol composite process is between the water glass process and the silica sol process. Its quality stability is better than that of water glass but inferior to the silica sol process, and the surface finish and product quality of the castings produced are better than those of water glass, but the production cost is much lower than that of the silica sol process. Therefore, foundry manufacturers will be more inclined to choose the silica sol composite process when producing a large number of mechanical products.

The above is the production process of stainless steel precision castings sorted out for everyone, I hope it can help you!