the advantages of aluminum die-casting are obvious that the quality of the product is guaranteed, the size of the castings is of high precision, and the general level is level 6 to 7. If the casting is in good condition, even the level of grade 4 can be reached, the surface of the casting is very good, smooth and will not appear rough. Noodles。 The advantages of strength and hardness are much better than that of ordinary sand types, and can be increased by twenty-five percent to thirty percent. With good dimensional stability, the elongation is reduced by seventy percent and the surface interchangeability is excellent. This method can be used for die casting with relatively complex component types. Take the zinc alloy, the thickness of the thin wall is 0.3 microns, and the casting is very fine.