| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of an inclusion defect and a detect such as a surface crack in lower pouring casting.SOLUTION: A slide nozzle is fully opened in a casting initial process I, and then, the slide nozzle is closed up to predetermined opening in a bottom squeezing process II, and the slide nozzle is controlled for opening-closing so as to maintain a predetermined absorbable speed such as a critical surface flow speed of molten metal in an ingot-making casting mold falls within a critical speed in a body casting process III thereafter, and the slide nozzle is controlled for opening-closing so as to maintain the absorbable speed in a predetermined speed smaller than the absorbable speed in the body casting process III, in a feeding head process IV after the body casting process III. |
