Mold (M "J part), industrial production used to injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods to obtain the required products of various models and tools. In short, the mold is used to shape the tool, this tool is composed of a variety of parts, different parts of the different parts of the mold. It is mainly through the physical state of the molding material changes to achieve the processing of the shape of the article. Known as "the mother of industry".

A tool that makes a billet a part of a specific shape and size under the action of an external force. Widely used for blanking, forging, cold forging and extrusion, powder metallurgy parts pressing, pressure casting, as well as engineering plastics, rubber, ceramics, such as product compression molding or injection molding forming process. The mold has a specific contour or shape of the cavity, and the shape of the edge of the knife edge can be used to separate the blank from the shape of the contour line. The shape of the cavity can be used to obtain the corresponding solid shape. Molds generally consist of two parts: the moving mode and the fixed mode (or the punch and the die), and the two part can be divided into two parts. Remove the separated parts, closed when the blank is injected into the mold cavity forming. Mold is a precision tool, complex shape, bear the blank expansion force, structural strength, stiffness, surface hardness, surface roughness and machining accuracy have higher requirements on, mold production level of development is machinery manufacturing level is one of the important signs.