Common causes that may cause sand sticking in precision castings

Sand sticking is a common problem in precision casting, which may affect product quality and production efficiency. The following are several common reasons that may cause sand sticking in precision casting:

1. Improper selection of sand mold materials: The selection of sand mold materials is very important to prevent sand sticking problems. If the selected sand mold material is not suitable for the specific casting process, it may easily adhere to the surface of the casting, resulting in sand sticking.

2. The moisture content of the sand mold material is too high: Too much moisture content in the sand mold material can also cause sand to stick. Excessive moisture may form a wet film on the surface of the sand mold, making it difficult to separate the casting from the sand mold.

3. Unreasonable mold design: The design of the mold will also affect the sand adhesion problem. If the design of the mold is unreasonable, for example, there are sharp internal corners or complex geometric shapes, these areas will easily cause sand to adhere to it.

4. Pouring temperature is too high: Pouring temperature that is too high may cause the sand on the surface of the sand mold to melt and form liquid mortar, resulting in sand sticking.

5. Improper surface treatment of the sand mold: The surface treatment of the sand mold affects the separation of the casting and the sand mold. If the surface of the sand mold is not treated properly, such as improper use of coating agents or the presence of contaminants, it may lead to sand sticking problems.

In order to solve the problem of sand sticking in precision casting, some measures can be taken, such as rationally selecting sand mold materials, controlling the moisture content of the sand mold, optimizing the mold design, controlling the pouring temperature, correctly treating the sand mold surface, etc. In addition, reasonable process parameters and operating procedures are also of great significance in reducing the sand sticking problem.