Classification of die castings and process characteristics

Classification of die castings and process characteristics

Press casting materials are divided into aluminum alloy die castings, zinc alloy die castings, magnesium alloy die castings and copper alloy die castings.

Divided by purpose, it can be divided into structural die castings and appearance decoration die castings.

Divided by application, it can be divided into automobile die-casting parts, 3C product die-casting parts, toy die-casting parts, etc. It can also be divided according to features such as shape and wall thickness.

The use requirements or quality requirements of various die castings are often different, and the die casting process schemes used will also be different. For example, structural parts are mainly load-bearing and have high strength, precision and internal quality requirements. The structural parts are mostly aluminum alloy die-casting parts, such as cylinder blocks, shells, various brackets, supports, etc. Such parts often require low-to-medium-speed filling in die-casting processes, and thicker inner castings. The decorative die castings are mainly decorative, and require higher surface quality and surface treatability. The decorative parts are mostly zinc and magnesium alloy die-casting parts, including toys, car models, lighting, hardware, mobile phones, and laptop shells. Such castings generally require surface treatment such as electroplating and painting, and are very sensitive to surface defects. In the die casting process, high-speed filling is often used, and the thickness of the inner gate is too thin.

Because of its low heat capacity and fast solidification speed, the die-casting process of magnesium alloy is also significantly different from that of aluminum, zinc, copper and other alloys. Magnesium alloy requires fast filling speed, which is one third higher than aluminum alloy under the same conditions, and the filling speed is sometimes as high as 100 meters per second. At present, magnesium alloy is the most rapidly developing die casting and the widest range to be developed.