Mold )( mújù) refers to various molds and tools used in industrial production, and the required products are obtained through injection molding, blow molding, extrusion, die casting or forging, melting and stamping. In short, molds are tools used to shape objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the article by changing the physical state of the molding material. Known as the "mother of industry".

A tool for making a blank into a product with a specific shape and size under the action of external force. Widely used in stamping, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, compression molding or injection molding of engineering plastics, rubber, ceramics and other products. The mold has a specific contour or cavity shape, and by applying the contour shape with cutting edge, the blank can be separated (punched) according to the contour shape. Applying the shape of the inner cavity can make the blank obtain the corresponding three-dimensional shape. Generally speaking, molds include a moving mold and a fixed mold (or a male mold and a female mold), which can be separated or combined. When parting, the parts are taken out, and when closing, the blank is injected into the mold cavity for molding. Die is a kind of precision tool with complex shape, which bears the bulging force of blank and requires high structural strength, stiffness, surface hardness, surface roughness and machining accuracy. The development level of mold production is one of the important symbols of mechanical manufacturing level.