The density of aluminum alloy is small, and the density is only one third of that of steel. At the same time, its thermal conductivity, processability and corrosion resistance are better than steel. The weight loss effect of typical aluminum alloy parts can reach 30%~40% at one time, and the weight loss effect of the second time can be further improved to 50%. The main production process of aluminum alloy parts is divided into casting and forging. The parts produced by casting process are mainly shell and support, such as engine cylinder head, gearbox housing, steering gear housing, engine bracket, steering gear bracket, etc; The parts produced by forging process are mainly parts with high mechanical performance requirements, such as wheels, chassis suspension system control arm, steering knuckle, air conditioning compressor scroll plate, etc.