What's principle of the mold?

Molds: a tool made up of a variety of parts.It mainly through the shape of the material physical state change to achieve the shape of the product processing.Commonly used in industry for injection, blow molding, extrusion, die-casting or forging molding, smelting, stamping, stretching and other methods to obtain the required products of various mold and tools.There are many kinds of molds. According to the processing object and processing technology, we can divide them into two parts.According to the different materials, the mould can be divided into metal mould.