Poor surface quality

slag inclusion

porosity and other casting defects easily appear in the aluminum engine cylinder head produced by traditional top-filling casting.To eliminate the problems which were difficult to control

a new bottom pouring method was proposed based on the structural characteristics and technical requirements of engine cylinder head.Gating system was determined for permanent mold casting aluminum alloy engine cylinder head

and cooling method of waterways combined with compressed air was adopted to achieve a sequential solidification of aluminum alloy melt from the bottom to top

which could ensure a smooth filling of molten metal

good exhaust capacity

and also reduce the slag deposition fully.Comparative analysis on casting quality shows that the bottom pouring design is reasonable and feasible

and good surface quality

few casting defects such as porosity

slag hole

and so on

could be realized

significantly improving quality of cylinder head.