| 摘要 |
PURPOSE:To improve the quality of cast ingots and the yield of casting in continuous casting using a water cooled casting mold by pressing a horn for transmission of ultrasonic waves on the mold and oscillating the mold ultrasonically. CONSTITUTION:The preceding end of a horn 4 for transmission of ultrasonic waves connected to an ultrasonic oscillator 3 is pressed to the upper part of a water cooled casting mold 1 provided with a water cooled jacket 2 to oscillate the mold 1 ultrasonically. Molten metal 6 is charged into such mold 1, and a solidified ingot 7 is drawn out continuously from the bottom end of the mold 1. The mold 1 is oscillated finely and the wettability of the mold 1 and the metal 6 is improved by the above-mentioned method. An initial solidified layer is thus grown uniformly, and the air gap between the mold 1 and the solidified layer is made uniform, whereby the delay in local solidification is obviated. The surface defects of the ingot 7 and the defects, such as shrinkage cavities, produced in the central part are reduced effectively. |
