In aluminum, magnesium alloy die-casting molds, and gravity metal mold-casting molds, the design of the cooling system is also a key. The cooling system sometimes called the cooling pipe or the cooling circuit is composed of a series of high thermal conductivity materials. Its purpose is to take the heat away from the molten metal through direct heat conduction and realize the control of the mold temperature. Controlled, and directed cooling, to allow castings to cool as quickly as possible.