Mould（mú jù），Various molds and tools used in industrial production to obtain desired products by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods. In short, a mold is a tool used to make molded articles. 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 molded 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 an external force. It is widely used in blanking, die forging, cold heading, extrusion, pressing of powder metallurgy parts, pressure casting, and molding or injection molding of engineering plastics, rubber, ceramics and other products. The mold has a specific contour or cavity shape, and the blank can be separated (punched) according to the contour shape by applying the contour shape with the cutting edge. The application of the inner cavity shape can make the blank obtain the corresponding three-dimensional shape. The mold generally includes two parts: a moving mold and a fixed mold (or a male mold and a female mold), which can be opened or closed. When separating, take out the parts, and when closing, inject the blank into the mold cavity for forming. The mold is a precision tool with complex shape and bears the expanding force of the blank. It has high requirements for structural strength, stiffness, surface hardness, surface roughness and machining accuracy. The development level of mold production is one of the important signs of the level of mechanical manufacturing.