Die-casting machines are generally divided into two categories: hot-chamber die-casting machines and cold-chamber die-casting machines. Cold press chamber die-casting machines are divided into horizontal die-casting machines and vertical die-casting machines (including full-vertical die-casting machines) according to the structure and arrangement of their pressure chambers. The pressure chamber of the hot press chamber die casting machine (referred to as the hot air die casting machine) is immersed in the liquid metal in the heat preservation melting crucible, and the injection part is not directly connected to the machine base, but is installed on the crucible. The advantages of this die-casting machine are simple production process and high efficiency; low metal consumption and stable process. However, the pressure chamber and the injection punch are immersed in the liquid metal for a long time, which affects the service life. And it is easy to increase the iron content of the alloy. Hot press chamber die-casting machines are currently mostly used for die-casting zinc alloy and other low-melting alloy castings, but they are also used for die-casting small aluminum and magnesium alloy die-castings. The pressure chamber of the cold chamber die casting machine is separated from the holding furnace. During die-casting, the liquid metal is taken out of the holding furnace and poured into the press chamber for die-casting.