Mold (m ú J ù), various molds and tools used in industrial production to obtain required products by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods

Under the action of external force, it is a tool to make the blank into a workpiece with specific shape and size. It is widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, 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 (blanking) according to the contour shape by using the contour shape with a cutting edge. The corresponding solid shape of the blank can be obtained by using the shape of the inner cavity. Mold generally includes moving mold and fixed mold (or punch and concave mold), which can be divided and combined. Take out the workpiece when separating, and inject the blank into the mold cavity when closing. Mold is a precision tool with complex shape, bearing the expansion force of blank, and 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 symbols of mechanical manufacturing level.