Method for manufacturing a metal ingot comprising a bore, and associated ingot and molding device

A method for producing a metal ingot comprising a longitudinal bore, through molten metal casting in a mold comprising:

• providing a mold with a generally annular mold cavity, delimited by an ingot mold extending vertically above a support, the ingot mold having an upwardly open cavity, by a vertical core positioned inside the cavity, and by a bottom;
• positioning the mold inside a vacuum-cast enclosure including means for introducing molten metal at the upper portion thereof;
• providing means for receiving and distributing molten metal, which is suitable for receiving the molten steel introduced into the vacuum-cast enclosure and for redistributing the molten metal in the mold cavity, and which is arranged at the upper portion of the mold cavity,
• introducing the molten metal into the enclosure, by
• forming a first jet of molten steel under a vacuum, in order to pour the molten metal over the receiving and distributing means, and by
• forming at least one second jet of molten steel under a vacuum, which originates with the receiving and distributing means and terminates in the mold cavity so as to fill the mold cavity with molten metal.

A device for vacuum casting a metal ingot comprising a longitudinal bore, said device comprising:

• a mold comprising a mold cavity delimited by:
• an ingot mold;
• a core made from a reinforced refractory material arranged vertically in the ingot mold;
• and
• a bottom;
• and means for receiving and distributing molten metal arranged bearing on the upper end of the core.