The Transmission Housing is a load-bearing part. It is generally made of die-cast aluminum alloy (Al-Si-Cu series alloy) through special molds. On the one hand, it has high strength, good pressure resistance, low hot brittleness, good mechanical properties and Machinability, and on the other hand, it has good castability and pressure resistance, which is suitable for manufacturing large-scale die castings with irregular shapes and more complex shapes.