| 摘要 |
PURPOSE:To prevent the decrease of a yield by splashing in a melting stage by erecting a wall material made of a spongy active metal to enclose the electron beam irradiation area of a melting vessel for the spongy active metal. CONSTITUTION:The spongy active metal G is continuously supplied from a hopper 3 into a water-cooled vessel 4 in a shielding case 1 and the inside of the case 1 is evacuated by a vacuum evacuation system 5. The active metal G is melted by electron beam irradiating devices 2a, b and a molten metal M is fed from one end of the vessel 4 to a water-cooled casting mold 8 by which the molten metal is successively cooled and solidified. The solidified metal is continuously drawn by an ingot drawing device 9. The wall material 7 made of the spongy active metal is erected in the upper part of the vessel 4 so as to enclose the region to be irradiated by the electron beam from the device 2a. The small drops of the molten metal splashed during melting are captured by the material 7.
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