High-pressure die casting: This process uses a die-casting machine to inject liquid aluminum into a mold for shaping, which can produce aluminum castings with smooth surfaces and high precision. The commonly used pressure during die casting is 4-500MPa, and the metal filling speed is 0.5-120m/s. Therefore, the filling time of molten metal is very short, and the mold cavity can be filled in about 0.01-0.2 seconds (depending on the size of the casting).

The characteristics of aluminum alloy die castings are:

1. The surface finish of the product is good, reaching Ra6.3 or even Ra1.6.

2. Cannot be heat treated.

3. The product has high air tightness, high casting strength and surface hardness, but low elongation, and excessive wall thickness can easily produce pores.

4. The mold cost is high and the service life is short.

5. High production efficiency.

6. Can produce thin-walled parts with small machining allowance.

7. Special aluminum alloy cannot be used.