Based on introduction of the processing procedure of rapid sand casting engine cylinder head and its casting process design

filling and solidification of liquid aluminium alloy were visualized by the ProCAST software.The simulated results reveal that the smooth filling can be realized by one-side bottom gating system.During the solidification process

the outer wall of cylinder head is solidified ahead

and then the inner casting.Satisfied feeding effect of risers on large thick parts of upper part of workpiece wall and ingates on bottom part of workpiece wall can be realzied

respectively.Absence of isolated liquid region in the casting can be observed.The inner cylinder head has only the uniformly dispersed shrinkage porosity（hole）

and the porosity is less than 10%

exhibiting excellent casting quality.