PURPOSE: To easily obtain a hollow metal ingot metal ingot having high melting point under high yield and low cost by melting the metal having high melting point by energy beam under high vacuum pouring into annular casting and drawing while vibrating the mold and rotating the ingot.
CONSTITUTION: Under high vacuum, the metallic raw material having high melting point, such as Ti, etc., is supplied into the watercooling copper hearth 4 from a hopper 3 through a guide 3 and gladually melted by applying electron beam from an electron beam gun 1. The molten metal obtd. in this way, is overflowed, and poured into the annular casting space formed by a water-cooled copper mold 5 and a water-cooled copper core 6. Further, the molten metal pool in the above space is periodically applied by the electron beam from the electron beam gun 1, to prevent rapid solidification and hold the molten metal pool. While vibrating the above mold 5 and the core 6, the hollow ingot 7 formed by cooling and solidifying, is drawn downward, while rotating as centering an axis by drawing device 8.
NOHARA KIYOHIKO
KAKIO YASUHIRO
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