Abstract A nozzle consisting of a pouring tube and a return cup extends down into a strand casting mold for pouring molten metal into it. The return cup is suspended in the mold at the lower end of the pouring tube and is submerged below the liquid level in the mold in a position to receive the metal issuing from the pouring tube and redirect it upwardly along the inside wall of the cup. The cup is dimensioned and located so that the eddies that are formed by the countercurrent flow of metal therein will lose their intensity before reaching the bottom and will die out before reaching the openings in the upper part of the cup through which the upwardly flowing metal escapes into the surrounding mold. The inside of the cup is large enough for its side wall and upper face of its bottom to be free from the eddies, while the outside of the cup is small enough to keep the metal that flows down around the outside of the cup from accelerating. The result is that the molten metal leaving the cup is substantially free of turbulence and flows in such a manner that the objectionable inclusion materials in the metal float up to the top of the molten body of metal in the mold around the cup instead of being carried down into the casting strand to contaminate the product upon solidification.
Inventors
👤 Howard E Whisler
👤 Bhupendra Umedchand Shah
👤 Gerald Vernon Jeskey
👤 Ray Albert Bloom
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-29 03:03
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
372 words
In the production of high grade strand cast metal substantially free of inclusions, the combination with a strand casting mold open at top and bottom, of a nozzle formed from a pouring tube and a return cup and extending down into the mold for pouring a stream of molten metal into it, the lower end of the pouring tube being centered in the mold, and the return cup having a substantially vertical side wall and being suspended in the mold at the lower end of the pouring tube in a position to receive centrally said stream, the cup being small enough to sharply reverse the stream and redirect it upwardly and along the inside wall of the cup, the bottom of the cup being located far enough below the pouring tube to cause fluid-on-fluid friction and generation of eddies thereby between concentric downward and upward flows of metal in the cup in order to reduce the velocity of the upwardly flowing metal, there being openings at the uPper part of the cup above the level of turbulence therein for low velocity escape of the upwardly flowing metal laterally from the cup into the surrounding mold, said openings being located below the molten metal level in the mold and positioned to allow the metal leaving them to flow upwardly at an inclination as it flows laterally away from the cup, the distance from the lower end of the pouring tube to the upper surface of the bottom of the cup being at least twice the inner diameter of the cup to space said eddies from the bottom of the cup, the inner diameter of the cup being substantially twice the inner diameter of the lower end of the pouring tube to space said cup side wall from the eddies, and the outside of the cup being small enough in relation to the mold to keep the metal flowing down around the cup from accelerating, whereby the metal leaving the cup will flow therefrom in such a manner that objectionable inclusion materials in the metal can float up to the top of the molten body of metal in the mold around the cup and be retained by a layer of slag on said body.
Claim 2
Dependent Claim
372 words
In the production of high grade strand cast metal substantially free of inclusions, the combination with a strand casting mold open at top and bottom, of a nozzle formed from a pouring tube and a return cup and extending down into the mold for pouring a stream of molten metal into it, the lower end of the pouring tube being centered in the mold, and the return cup having a substantially vertical side wall and being suspended in the mold at the lower end of the pouring tube in a position to receive centrally said stream, the cup being small enough to sharply reverse the stream and redirect it upwardly and along the inside wall of the cup, the bottom of the cup being located far enough below the pouring tube to cause fluid-on-fluid friction and generation of eddies thereby between concentric downward and upward flows of metal in the cup in order to reduce the velocity of the upwardly flowing metal, there being openings at the uPper part of the cup above the level of turbulence therein for low velocity escape of the upwardly flowing metal laterally from the cup into the surrounding mold, said openings being located below the molten metal level in the mold and positioned to allow the metal leaving them to flow upwardly at an inclination as it flows laterally away from the cup, the distance from the lower end of the pouring tube to the upper surface of the bottom of the cup being at least twice the inner diameter of the cup to space said eddies from the bottom of the cup, the inner diameter of the cup being substantially twice the inner diameter of the lower end of the pouring tube to space said cup side wall from the eddies, and the outside of the cup being small enough in relation to the mold to keep the metal flowing down around the cup from accelerating, whereby the metal leaving the cup will flow therefrom in such a manner that objectionable inclusion materials in the metal can float up to the top of the molten body of metal in the mold around the cup and be retained by a layer of slag on said body.