Difference between sand casting and precision casting

Sand casting and precision casting are two commonly used metal casting processes, and there are some differences in casting process, materials and application.

1. Sand casting:

Sand casting is a traditional and commonly used casting method, and its characteristics include:

sand mould casting

Material: The molds used for sand casting are usually made of special sand molds (usually quartz sand) which can be reused. The metal to be cast is usually a low melting point alloy or other castable metal.

Process: In the sand casting process, firstly, a mold is made, then molten metal is poured into the mold, and after cooling and solidification, the mold is taken out to obtain the required casting.

Accuracy: Compared with precision casting, sand casting has lower accuracy and rough surface quality. Sand casting is suitable for manufacturing some castings with large size, simple shape and low precision requirements.

2.？ Investment casting:

Precision casting is a high-precision casting method, and its characteristics include:

Description of precision casting process

Material: In precision casting, special wax with heat resistance and wear resistance is usually used to make molds, and this wax mold will be melted and removed during casting. The cast metal is usually an alloy with a high melting point.

Technology: In the process of precision casting, firstly, a wax pattern is made, and then the wax pattern is soaked in ceramic paint to form a ceramic shell and a hollow mold. Next, the molten metal is injected into the mold, cooled and solidified, and then the mold is taken out to obtain the required casting.

Accuracy: Compared with sand casting, precision casting has higher accuracy and smoother surface quality. Precision casting is suitable for manufacturing some castings with small size, complex shape and high precision requirements.

In a word, sand casting is a traditional casting method, which is suitable for manufacturing castings with large size, simple shape and low precision requirements. Precision casting is a high-precision casting method, which is suitable for manufacturing castings with small size, complex shape and high precision requirements. The choice of casting method mainly depends on the design requirements, cost and production requirements of castings.