The ProCAST software was used to simulate the die-casting process of Mg-xSm-0.3 Zn series magnesium alloy. The initial parameters

such as pressure

specific pressure

mold temperature casting temperature and injection rate were set as 0.2 MPa

40 MPa

200～280 ℃

680～740 ℃ and 1.5～6.0 m/s

respectively

to understand the effects of these parameters on the die-casting process of rare earth magnesium alloy. The results indicate that the distribution of shrinkage porosity can be improved when the mold temperature and casting temperature are appropriately low

and the difference of mold temperature has a more obvious effect on the filling process of alloy. Proper increase in injection speed can make the casting better feeding

however should not be too high in order to reduce the service life of the metal mold. When the content of rare earth is 0.8%

the filling process is the most stable

and the time needed for filling and complete solidification reaches the peak. With the increase of rare earth content

the temperature difference between solid and liquid is decreased from 70 ℃ to 46 ℃

and the shrinkage cavity and porosity of the castings are effectively improved.