Patent ID: 8875776

Claim:
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 molten steel metal 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.