In fact, precision casting has a wide range of applications, but considering the size, weight and cost, it is now selectively used. The advantages of precision casting are a wide range of applicable materials, small precision tolerances of castings, and high surface smoothness. It can produce combined workpieces at one time and is suitable for mass production. The disadvantage is that the production cycle is long, the auxiliary materials are high, the size and weight of the castings are limited, and the process requirements and process management are strict.

These include investment casting, ceramic casting, metal casting, pressure casting, and lost foam casting. Among them, investment casting is commonly used: choose suitable investment materials to make honing machine investment molds; repeat the process of painting and sandblasting on the investment mold to harden the shell and dry; then dissolve the internal investment mold to obtain a cavity; baking the shell can be To obtain sufficient strength, burn off the remaining investment materials, pour the required metal materials, and clean the sand after shelling, so as to obtain high-precision finished products. According to product needs or heat treatment and cold processing.