Furan resin sand is used for molding, and the 24h strength of sand mold (core) is controlled σ b≥1.0 MPa； The rigidity of the sand box used for molding should be good, and the sand consumption of the mold should be large enough to ensure the overall rigidity of the mold. Semi closed bottom pouring system with filter is adopted to ensure stable pouring and prevent slag inclusion in molten iron.
The cross-sectional area ratio of each unit of the gating system is f straight: F horizontal: F inner = 1.16:1.08:1, and the filter size is 150 mm × 150 mm × 30 mm. The casting process and gating system structure are shown in the figure.