| 摘要 |
PURPOSE:To improve strength and to stabilize a quality for a casting product by pouring at first a needed quantity of FC (FCHD) from a margin sprue of a mold and after a short time, FCD from a central sprue of the mold, and rotating with high speed for the mold. CONSTITUTION:The mold 12 consisting of a cope 9, core 10 and drag 11 on a dish 8 fixed at upper end of a rotating shaft 6. The mold 12 is formed as a hub cavity 16 near at its axial center and as a margin cavity 13 near at its margin. At first, the needed quantity of the molten FCHD is poured into the margin cavity 13 from the margin sprue 14 of the mold 12 as stopped condition, and after a short time, the another quality of molten iron casting, such as FCD or CV iron casting, is poured into the hub cavity 16 and connected cavity 17 from the central sprue 33 of the mold. Next, both of the molten castings for pouring into the hub cavity and margin cavity are integrated with through the connecting cavity by high speed rotation of the mold 12. Thus, the improvement of the strength and the quality for the casting product is obtained by increase of the boundary joining area, etc.
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