Aiming at a die casting large complicated aluminum alloy power parts

some technological ways including improving flow types and optimizing vacuum exhausting structure are employed to significantly reduce the gas-entrapment defects in the parts on the basis of understanding flow and filling process of liquid aluminum alloy by numerical simulation and physical examination.Meanwhile

shrinkage porosity（hole） in the parts is eliminated by adopting movable insert

local pressurization and exact control for die temperature.Through above technological ways

both the appearance and quality of the parts can meet the designing requirements

realizing volumetric-production in a short time.