The design of permanent mould for piston in MAZDA620 was introduced. CAE was used in design and manufacturing of the permanent mould

and the filling process was simulated. The rational measures were employed to avoid the possible defects including gas hole and cold shut in the mold

such as assembling airway and properly improving mould temperature and alloy temperature. So the mould can meet the requirements of applied technology

and desirable castings can be produced.