Forging is a collective term for forging and stamping. It is a forming and processing method of using a hammer, anvil, punch of a forging machine or applying pressure to a blank through a die to plastically deform it to obtain the desired shape and size. . In the forging process, the billet has obvious plastic deformation as a whole, and there is a large amount of plastic flow; in the stamping process, the billet is mainly formed by changing the spatial position of the area of each part, and there is no plastic flow with a large distance inside it. Forging is mainly used to process metal parts, and can also be used to process some non-metals, such as engineering plastics, rubber, ceramic blanks, brick blanks and the forming of composite materials. Rolling, drawing, etc. in forging and metallurgical industry belong to plastic processing, or pressure processing, but forging is mainly used to produce metal parts, while rolling and drawing are mainly used to produce plates, strips, pipes, etc. General-purpose metal materials such as profiles and wires. Forging is a collective term for forging and stamping, like industry and trade, also known as industry and trade.