There are many types of molds, which can be divided into: ① molds for processing metal according to the processing object and process. ② Mold for processing non-metallic and powder metallurgy. This includes plastic molds (such as injection molds, compression molds, and extrusion molds), rubber molds, and powder metallurgy molds. According to the structural characteristics, molds can be divided into flat punching molds and cavity molds with space. Molds are generally single piece and produced in small batches.