By designing a vacuum extraction system with main and secondary exhaust pipes

and combining with the Flow-3 D simulation software

the vacuum die casting of magnesium alloy radiator was carried out. The results show that the vacuum die casting of magnesium alloy with complete appearance and compact structure can be obtained by using the vacuum pumping system. By adjusting the position of the inductor

different cavity vacuum degrees can be achieved. The filling capacity of magnesium alloy can be improved effectively by increasing the vacuum degree of mold cavity

and the porosity or shrinkage defects in die castings can be eliminated.When the cavity vacuum is 10 kPa

the air volume of the magnesium alloy radiator die casting is the least

and the tensile strength and elongation of the die casting are improved correspondingly.