As an important technical parameter in squeezing casting

the squeezing force is the dominant effects on microstructure and properties of the squeezing castings. Thermodynamic coupling model based on the FEM was employed to simulate squeezing casting convex-type punch and to analyze function of specific pressure with microstructure and mechanical properties of the A356 alloy parts

obtaining economic critical squeezing forces. The results reveal that with increasing in squeezing force

shrinkage porosity （hole） is gradually decreased to be eliminated

and then the further improvement of the defects can be ignored

however

loading of the mould is increased. In addition

with increasing in squeezing force

grain size in the castings is refined

where with 120MPa squeezing force

grain size is decreased by 8%

and secondary arm spacing is narrowed by 12.5%

and then refinement of grain size can be ignored.