| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of a recess in an inner surface of a thick-walled portion in casting moldings of different wall thickness in the axial direction by a vertical centrifugal casting method, and to solve problems that a shrinkage is generated in the inner surface portion, segregation of carbide is generated, the structure on the inner surface side forms a non-sound structure, the yield of the material is degraded by grinding the non-sound structure, and moldings of small inside diameter is less easily obtained. SOLUTION: When a molten metal is poured inside a cavity 22 of the mold 16, and the molten metal is cast in a shape corresponding to the shape of the cavity 22 by the centrifugal force by the high-speed rotation of the mold and having a cavity portion 50 in the longitudinal direction in the center portion, the first molten metal is cast in the cavity 22 of the mold 16 from an opening 36, and a second molten metal formed of the same material is additionally poured therein immediately before the inner surface portion of the first molten metal is solidified.
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