| 摘要 |
PURPOSE:To prevent deformation of the casting itself, the damage of a casting mold and the cause of troubles in strength by forming cooling slits at an equal pitch in the circumferential direction of a casting mold pipe to the outside surface in the upper part of a casting mold pipe on the side not in contact with a molten steel mainly in the longitudinal direction of said pipe. CONSTITUTION:The plural cooling slits 16 are formed at an equal pitch in the circumferential direction to the outside surface of the casting mold pipe 2 in the longitudinal direction 15 of the pipe 2 and in a region 13 in the height direction predetermined for the purpose of a molten metal level 14. The slits 16 are formed in a straight vertical direction and the cross section thereof is approximately trapezoidal 17 provided with roundness 19 in a base 18. The width 16b on the outside determines a cooling surface area. The space 22 between the pipe 2 and a coolant conduit 7 in the region 13 is usually made narrower than the space in the part 13a existing in the low position where the slits 16 do not exist. Said space may be made zero. The coolant passes through a coolant supply port 4, flows in an annular space 6 for the coolant from above to below and emerges from a coolant reflux chamber 3b, thereby cooling satisfactorily the casting mold pipe and preventing the deformation, etc. occuring in the cooling defect of the casting.
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