The die-casting process is a process that uses pressure, speed and time to unify the three elements of machine, mold and alloy. For metal thermal processing, the presence of pressure is a major feature of the die casting process that distinguishes other casting methods. Pressure casting is a kind of special casting method with less cutting and no cutting in the modern metal processing technology.

It is a process in which molten metal is filled in a mold at a high pressure and high speed, and crystallized under high pressure to form a casting. High pressure and high speed are the main features of pressure casting. The commonly used pressure is tens of megapascals, the filling speed (inner gate speed) is about 16 to 80 m/s, and the time required for the molten metal to fill the mold cavity is extremely short, about 0.01 to 0.2 seconds.

Since the production of the product by this method has high production efficiency, simple process, high tolerance grade of casting, good surface roughness and high mechanical strength, it can save a lot of mechanical processing steps and equipment, and save raw materials, so it has become An important part of China's foundry industry.