US3499587A - Adjustable pouring nozzle for a ladle or tundish - Google Patents

Description

March 10, 1970 K. BROCK 3,499,587

ADJUSTABLE POURING NOZZLE FOR A LADLE 0R TUNDISH 1 Filed May v, 196s ATTORNEYS United States Patent O 3,499,587 ADJUSTABLE POURING NOZZLE FOR A LADLE R TUNDISH Klaus Brock, Dusseldorf, Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany, a company of Germany Filed May 7, 1968, Ser. No. 727,249

Claims priority, application Germany, May 11, 1967,

1,558,310 Int. Cl. B67d 3/00 U.S. Cl. 222-526 6 Claims ABSTRACT OF THE DISCLOSURE This is an adjustable nozzle for directing a stream of molten metal from a ladle or tundish which has a discharge orifice with a flat face surface around the discharge end of the orifice. The nozzle is provided by a block having a flat end surface abutting, and slidable across, the fiat face surface around the orice. A hole through the block with one end opening through the fiat end surface of the block has a smaller diameter than the orifice so that the block may be shifted to alternative lateral positions relative to the orifice, while maintaining the hole in uid flow communication with the orifice, for adjusting the position of the outflow from the exit end of the hole.

The present invention is an adjustable pouring nozzle for directing a stream of molten metal from the discharge orifice of a ladle or tundish.

The speed and quality of casting are vitally affected by the alignment of the stream of molten metal poured into the mold cavity from the ladle or tundish which supplies the metal to the mold. This is particularly true in continuous casting in which the speed of casting is determined by the cooling rate of the mold and by the uniformity with which the periphery of metal in the mold is cooled.

The alignment of the stream from the ladle or tundish with the mold cavity has customarily been accomplished by shifting the position of the ladle or tundish relative to the mold cavity and/or by shifting the position of the mold. This is an awkward and time consuming procedure. Moreover, it is difficult to make an accurate adjustment by having to move these bulky and heavy parts.

It is an object of the present invention to provide a nozzle that is movable relative to the discharge orifice of a ladle or tundish for aligning the outpouring stream of molten metal with the mold cavity without having to shift the position of the ladle or tundish and/or of the mold. Thus, the alignment is made more easily and quickly, and more accurately, than with apparatus which requires shifting the ladle or tundish and/ or the mold. y

Another object is to provide a nozzle arrangement in which alternative nozzle openings are adapted to be shifted into fluid flow communication with the discharge orifice as means for replacing worn nozzle openings or substituting a nozzle opening of a different size or configuration.

A further object is to provide an adjustable nozzle in accordance with the invention that is adapted to be stopped with a conventional form of stopper rod.

In accordance with the invention, a ladle or tundish has a fiat face surface around its discharge orifice. The nozzle is formed by a block movably mounted for a flat end surface of the block to be slidable across, and in abutting relation with, the flat face surface, and one end of a hole through the block opens through the fiat end surface. The discharge orifice is made to have a longer diameter than the hole through the block;I thus, the block is adapted to be shifted to a variety of lateral positions relative to the ICC orifice, while maintaining the hole in fluid ow communication with the orifice, for shifting and adjusting the position of the stream of molten metal from the other, exit, end of the hole. It would also be possible to utilize the block as a stopper by having the area of the end surface large enough to include a blank portion larger than the diameter of the exit end of discharge orifice so that the block could be shifted to move the blank over the exit of the orifice to stopper it. The stoppering may also be accomplished with a conventional form of stopper rod having an end adapted to be received in, and stopper, the upper end of the hole through the block.

In another embodiment of the invention the block may be provided with several holes to be moved alternatively into fiuid ow communication with the discharge orifice. Thus, when a hole became worn, the block could be shifted to move a substitute hole into place; or the several holes could be of different sizes and/or configurations which could be substituted for each other as means for adjusting the pouring rate, or the nature of the stream being poured. For example, depending on the properties of the metal being poured, it is sometimes advantageous to have the hole oval in cross section as a means of reducing turbulence in the stream.

The discharge orifice of the ladle or tundish customarily has a liner, or hole brick, in it and the lower edge of the orifice defined by the liner is advantageously provided with a replaceable insert defining the edge, and the outward face of this insert is fiat to form the fiat face surface which the flat end surface of the nozzle block abuts and slides across. This insert may thus be replaced when it is worn, thereby saving the trouble and expense of hav ing to replace the entire orifice liner. In the preferred form of the invention the outward end of the orifice liner, or the insert therein, which forms the flat face for the nozzle brick, projects from the ladle or tundish to provide a clear bearing surface for the nozzle block.

Illustrative embodiments of the nozzle of this invention are described below with reference to the accompanying drawings in which:

FIG. 1 is a vertical section through the discharge orifice of a ladle or tundish, and through a nozzle therefor in accordance with this invention;

FIG. 2 is a plan view of another embodiment of a nozzle brick ofvthis invention, showing three alternative nozzle holes through it; and

FIG. 3 is a vertical section through another form of a discharge orifice of 'a ladle or tundish, and through another embodiment of the nozzle brick, showing a stopper rod in stoppering position.

Referring to FIG. 1, the bottom 10 of a ladle or tundish, having a lining 11, has a discharge orifice 12 defined by a liner, or hole brick, 13. The bottom, exit, end of the liner 13 is defined by an insert 14 which has the same diameter as the orifice 12 and which can be readily replaced when it becomes worn. The outer face 15 of the insert 14 is flat around the orifice and forms a bearing surface which the upper flat end 16 of a nozzle block 17 is pressed against to form a seal.

The nozzle block 17 is carried in a holder 18 which is lmounted to be moved laterally by mechanism known in the art. The block 17 is moved laterally by the holder 18 for sliding the flat end 16 of the block relatively across the face 15 of insert 14 and the holder 18 may be adapted to move the block laterally in one, or several, directions and is adapted to press the vblock 17 against the face 15 with sufficient pressure to maintain sealing Contact therewith.

The block 17 has a hole 19 therethrough, with the upper end of the hole opening through the at end 16 to be in iluid flow communication with the discharge orifice 12.

The other, lower, end of the hole 19 opens through another side of the block 17-the bottom in the embodiment shown. In the embodiment illustrated, the hole 19 has an enlarged funnel port-ion 19a at its upper end. The orifice 12 and the hole 19 are formed with the diameter of the orifice much larger than the smallest diameter of the hole 19. Thus, the block 17 may be shifted laterally relative to the axis of the orifice 12 an amount approximately equal to half the difference between the diameters of the orifice 12 and hole 19 for maintaining the orice and hole in fluid fiow communication, so as to shift the block, and the stream of metal emerging from the hole 19, to align the emerging stream with a mold cavity below.

FIG. 2 shows a nozzle block 17a which has three holes 19 arranged in a circle around a center 20. The several holes 19 may be the same diameter, to provide substitutes for one of the others when it becomes Worn, or may be different diameters and/or configurations for alternative positioning in order to change the pouring speed or the effect of the pouring. In this embodiment the nozzle block 17a may be mounted to rotate about the center 20 spaced from the axis of the discharge orifice 12 so that by rotating the block 17a successive holes 19 can be brought into fluid flow communication with the discharge orifice 12.

The embodiment shown in FIG. 3 illustrates the employment of a stopper rod 21 for stoppering the hole 19 in nozzle block 17b. This embodiment also serves to illustrate some additional useful features in the general structure.

In this embodiment the upper portion 12a of the discharge orifice 12 as defined by the orifice liner 13a is funnel shaped to minimize surface wear, and also to permit angular arrangement of the stopper rod 21 relative to the hole 19-for example, when the nozzle brick 17b is shifted (by movement of the holder 18a for the brick 19) to shift the hole 19 to one side of the discharge orifice 12a. The lower end of the liner 13a projects down, through an appropriate aperture in the bottom of a ladle or tundish, below the `bottom 10, and its bottom surface provides the fiat face 15a which is engaged by the flat end 16a of the nozzle block 17b. The bottom edge 22 of liner 13a at the bottom, exit, end of the discharge orifice 12 is rounded, as Shown, to avoid wear at that edge due to the sliding movement of the flat end 16a of the block 17b across the at face 15a on the bottom end of the liner 13a.

The upper end edge 23 around the upper end of the hole 19 through the block 17b is rounded, as is the bottom end 21a of the stopper rod 21 so that the end 21a is received in the upper end of the hole 19 at various angles from straight up and down. Thus, the stopper rod 21 can be applied to stopper the hole 19 even when the block 17 is in a position with its hole 19 adjacent one edge of the orifice 12a.

Also, as shown in FIG. 3, a bottom portion of the block `17b extends down through the holder 18a as means to provide a longer nozzle hole 19 for more accurate direction of a stream of molten metal flowing out through the hole 19.

What is claimed is:

1. An adjustable pouring nozzle for directing a stream of molten metal from a ladle or tundish which has a discharge orifice with a flat face surface around the discharge end of the orifice, said nozzle comprising a block having a flat end surface abutting said face surface and being mounted for relative sliding movement of its fiat end surface across said face surface, said block having a hole therethrough with one end of the hole opening through the fiat end surface of the block and the other end of the hole opening through a different side of the block, and said hole having a smaller diameter than said discharge orifice whereby the hole through the block will be in fluid flow communication with the orifice in various alternative lateral positions of the block relative to the discharge orifice so as to be able to adjust the position of an outflow of molten metal from the ladle or tundish by shifting the position of the block.

2. The nozzle of claim 1 in which said block has more than one of said holes therethrough and is movable for alternatively placing said holes in fluid flow communication with the orifice.

3. The nozzle of claim 2 in which the ends of said holes opening through the flat end surface of the block are arranged in a circle about a center and in which the block is mounted to rotate about said center for selectively moving the holes into fluid flow communication with the orifice.

4. The nozzle of claim 1 in which an annular lower edge defining the discharge end of the orice projects below the bottom of the ladle or tundish, said face surface around the discharge end of the orifice being the outward face of said edge.

5. The nozzle of claim 4 in which said annular lower edge at the discharge end of the orifice is a replaceable insert set into the wall of the orifice.

6. The nozzle of claim 1 in combination with a stopper rod having an end adapted to be received in the upper end of the hole through the block for stopping the hole, the edge of the upper end of the hole and said end of the stopper rod being rounded for said end of the stopper rod to be received in stopping position in the upper end of the hole from various angles relative to the axis of the hole.

References Cited UNITED STATES PATENTS 565,538 8/1896 Guthrie 222-526 X 1,072,972 9/ 1913 Michaels 222-567 1,123,035 12/1914 Tanner 222-567 X 1,921,240 8/ 1933 Porter 222-460 2,441,292 5/1948 Schroeder et al. 222-526 X SAMUEL F. COLEMAN, Primary Examiner

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