Precision casting, Refers to the general term for the process of obtaining precise size castings. Compared with the traditional sand casting process, the casting size obtained by precision casting is more accurate and the surface finish is better. It includes: investment casting, ceramic mold casting, metal mold casting, pressure casting, and lost foam casting.
Precision casting is also called lost wax casting. Its products are precise, complex, and close to the final shape of the part. It can be used directly without processing or with little processing. Therefore, investment casting is an advanced technology with near net shape.
It includes: investment casting, ceramic mold casting, metal mold casting, pressure casting, and lost foam casting.
One of the more commonly used is investment casting, also known as lost wax casting: choose suitable investment materials (such as paraffin) to make investment molds; repeat the steps of dipping refractory paint and sprinkling refractory sand on the investment mold, hardening the shell and drying; then Melt the inner investment mold to obtain a cavity; bake the mold shell to obtain sufficient strength and burn off the remaining investment material; cast the metal materials needed; solidify and cool, and clean the sand after the shelling, thereby obtaining high Precision finished product. According to product needs or heat treatment, cold processing and surface treatment.
Precision casting is also called lost wax casting. Its products are precise, complex, and close to the final shape of the part. It can be used directly without processing or with little processing. Therefore, investment casting is an advanced technology with near net shape.
The development of investment technology enables investment casting not only to produce small castings, but also to produce larger castings. The outline size of the largest investment casting is nearly 2m, while the minimum wall thickness is less than 2mm. At the same time, investment castings are also becoming more popular. Precision, in addition to linear tolerances, parts can also achieve higher geometric tolerances. The surface roughness of investment castings is also getting smaller and smaller, which can reach Ra0.4μm.