| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold structure where the flow of a molten metal is controlled in such a manner that the quantity of oxides present on an ingot surface can be made minimum in DC casting for aluminum. SOLUTION: A DC casting mold 200 comprises a cooling tubular body 100 that has a thermally insulated insert 400 attached to its top surface. The thermally insulated insert has a bottom portion with a beveled sidewall 402, which forms an angle with a horizontal plane layer 130 of the molten metal and creates an eddy. The eddy causes a substantial number of oxides that are formed during the casting process to remain in the bottom sidewall portion of the thermally insulated insert of the mold, thereby substantially reducing the number of ingot surface imperfections that promote ingot cracking. In addition, the eddy promotes break-up of the oxides into smaller pieces as the oxides flow toward the cooled inner walls of the cooled tubular body, thereby having limited surface area for growth of an oxide layer. COPYRIGHT: (C)2006,JPO&NCIPI
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