Die-casting is one of the most advanced metal forming method is to achieve less chips chipless effective way of applications, has developed rapidly.
       Now no longer confined to the non-alloy die-casting alloy of zinc, aluminum, magnesium and copper, and has gradually expanded to die-cast iron and steel castings. In the casting of non-ferrous alloys, aluminum accounted for the highest proportion (about 30% to 60%, followed by zinc alloy (In other countries, the vast majority of die-cast zinc alloy pieces), only the proportion of the total amount of copper alloy die casting 1 % to 2%, magnesium alloys are alloys in recent years, the international community more concerned, for research and development of magnesium alloy die-cast magnesium alloy research in particular, the squeeze casting, semi-solid processing technology is showing the situation everywhere .
        Size and mass (weight) of die casting, depending on the power of die casting machine. Due to the increasing power of die casting machine, die casting dimensions can be from a few millimeters to a 2m; mass (weight) can be from a few grams to several tens of kilograms. Abroad die-diameter 2m, mass (weight) of SOkg of aluminum castings.
       Die-casting has been widely used in various industries in the national economy, such as weapons, cars and motorcycles, aerospace components and electrical instrumentation, radio communications, television sets, computers, agricultural machinery, medical equipment, washing machines, refrigerators , the production of watches, cameras, architectural and household hardware components for various products.