It is usually used to make delicate hand model, suitable for small batch reproduction of manufacturing process, can be accurately shaped, showing surface details and three-dimensional texture.

Vacuum molding is a kind of physical molding method. It combines vacuum technology with sand mold casting. The cavity surface and back of sand mold are sealed by plastic film. Vacuum pump is used to produce negative pressure, which causes the pressure difference between the inside and outside of sand mold. After placing sand core, closing mold, casting, and waiting for the casting to solidify, the negative pressure is removed or the air pumping is stopped, then the mold sand will collapse and get the casting.

Moderate vacuum, high cavity compactness and high casting quality. Vacuum casting combined with computer simulation of mold flow analysis can predict the occurrence of casting defects. For the design of mold making scheme, it can greatly save time and improve production efficiency.