Die casting is a metal casting process, which is characterized by the use of mold cavity to apply high pressure to melted metal. Molds are usually made of higher strength alloys, a process somewhat similar to injection molding. The cost of casting equipment and mould is high, so it is easy to manufacture die-casting parts, so the single cost is very low, so it is especially suitable for manufacturing a large number of small and medium-sized castings. Therefore, die casting is one of the most widely used casting processes.