| 摘要 |
PURPOSE:To efficiently produce a bar-type casting block without internal defect by cooling the bar-type casting block and also specifying each dimension of a seed bar and a projecting part at the time of drawing up the bar-type casting block by the end projecting part of the seed bar fitting to a rotating bar. CONSTITUTION:The seed bar 3, which is the same kind as the molten metal 1, is fitted to the lower end of the rotating bar 2 and rotated, and the projecting art 3' is brought into contact with the molten metal 1, to draw up the bar-type casting block. Then, a cylindrical water cooling jacket 4 is arranged at around the bar-type casting block, to flow the cooling water, and the cooling inert gas is directly injected to the seed bar 3 by a ring type gas injector 5 from the lower side in the jacket 4. Further, the rotating bar 2 makes use of the material having rigidity higher than the bar-type casting block and good straightness and the outer diameter of the seed bar 3 is regulated to >=60% of the outer diameter of the bar-type casting block and its length is regulated to >=20% of the length of a cooling part 6. Further, diameter of the end injecting part 3' of the seed bar 3 has <=50% of diameter of the bar-type casting block and its length is regulated to >=5mm and <=20% length of the cooling part 6.
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