Many kinds of molds, according to processing objects and processing technology can be divided into: ① processing metal molds. ② processing of non-metallic and powder metallurgy molds. including plastic mold (such as two-color mold, compression molding and extrusion mold, etc.), rubber mold and powder metallurgy mold. According to the structure characteristic, the die can be divided into the blanking die of the plane and the cavity mould with space. Mold is generally a single piece, small batch production.