Mold (mú jù), various molds tools used in industrial production to obtain the desired product by injection molding, blow molding, extrusion, die casting forging, smelting, stamping other methods. In short, a mold is a tool used to make molded articles. This tool is composed of various parts, 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 formed material. Known as the "Mother of Industry" title.

A tool for making a blank into a specific shape size under the action of external forces. Widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, engineering plastics, rubber, ceramics other products compression molding injection molding processing. The mold has a specific contour cavity shape, the contour shape with the cutting edge can be used to separate (blank) the blank according to the contour shape. Applying the shape of the inner cavity can obtain the corresponding three-dimensional shape of the blank. The mold generally includes two parts, a movable mold a fixed mold ( a convex mold a concave mold), which can be divided combined. Take out the part when separated, inject the blank into the mold cavity when closed. The mold is a precision tool with complex shape bearing the expansion force of the blank. It has high requirements for structural strength, stiffness, surface hardness, surface roughness processing accuracy. The development level of mold production is one of the important signs of the level of mechanical manufacturing.