Apparatus for continuously producing hollow metallic ingot

Details Apparatus for continuously producing hollow metallic ingot Apparatus for continuously producing hollow metallic ingot

B - Operations, Transporting

22

D

22/56

B22D 7/02 (2006.01) B22D 11/00 (2006.01)

Patent

CA 1234674

APPARATUS FOR CONTINUOUSLY PRODUCING HOLLOW METALLIC INGOT Abstract of the Disclosure The apparatus comprises an annular water-cooled metallic mold having open upper and lower ends, a core member located in the inner space of the mold to form there- between an annular casting passage for solidifying therein the molten metal supplied in the casting passage, and a movable supporting base member adapted to initially close the lower end of the casting passage to support the molten metal therein and then moved downwardly apart from the lower end as the metal in the casting passage solidifies so as to permit the solidified metal to be pulled out from the casting passage for continuously producing the hollow metal- lic ingot. The core member comprises a heat-insulating member having a molten metal receiving vessel mounted thereon with at least a molten metal conducting passage formed therein communicating with the casting passage so as to supply the molten metal from the vessel to the casting passage, and a casting member made of graphite or a carbonic material and secured to the lower side of the heat-insulating member with the outer peripheral surface being tapered downwardly inwardly to form a casting face. The solidification of the molten metal supplied in the casting passage commences first at the outer surface thereof and proceeds inwardly, and finally to the inner surface of the molten metal thereby positively avoid- ing formation of solidified shell in the inner peripheral - ? - surface and occurrence of sweating or cold shut because the heat-insulating member makes the casting member to be heated quickly and therefore has the effect of slowing down the cooling and solidifying rate at the inner peripheral portion of the molten metal while the outer peripheral portion is quickly cooled and solidified by the effect of the water-cooled mold as well as by the effect of solidified and water-cooled metal pulled out from the casting passage. The provision of the molten metal receiving vessel on the heat-insulating member of the core member centrally of the casting passage permits the uniform temperature of the molten metal to be supplied to the casting passage and makes it possible to produce a thin-walled ingot. - ? -

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