Combination of vacuum and partial pressurization was adopted to eliminate the gas hole and shrinkage porosity in die casting automobile components. Four kinds of comparative experimental designs were presented including conventional die casting

vacuum die casting

partial pressurization die casting and combination of vacuum and partial pressurization. The results indicate that gas hole in die casting components can be eliminated by vacuum die casting

and shrinkage porosity in thick location of the castings can be solved

and both gas hole and shrinkage porosity can be relieved by combination of vacuum and partial pressurization method

which decrease the shrinkage porosity to 3.7% in the die casting components while shrinkage porosity in the conventional die casting components reaches 9.7%. In addition

the shrinkage porosity is decreased to 5.6% in partial pressurization die casting components.