RU62851U1 - INTERMEDIATE BUCKET FOR CONTINUOUS METAL CASTING - Google Patents

Abstract

The utility model can be used for continuous casting of steel. The technical task is to improve the quality of cast metal. The bucket includes a housing 1, inside which there are casting glasses 2 for supplying metal to the mold. The housing 1 is divided into a receiving 3 and casting 4 chambers of a vertically mounted transverse partition 5 with holes 6 for the passage of metal. From the side of the chamber 4, a central protrusion 7 is made on the surface of the partition 5. On the upper end surface 8 of the partition 5, an end protrusion is made 9. The bucket is equipped with elements 11 installed in the chamber 4 with overflow holes 12. Elements 11 form two extreme 13 and central 14 in the chamber 4 casting cavity. Elements 11 are provided with side blocks 15, made in each of the elements 11 from the side of the extreme cavities 13 symmetrically with respect to the axis 16 of the cavity 14, while in each of the blocks 15 there is a slotted nozzle 17 extending into the cavity 13, and in the element 11 there is a channel 18 for gas supply. The slotted nozzle 17 is made in the form of the main 19 and additional channels 20, 21. The channel 19 is located from the plane drawn through the edge 22 of the hole 12 located in the direction of the partition 5, perpendicular to the bottom of the bucket 23, in the direction of the partition 5, and the channels 20 are located from the plane drawn through the edge 24 of the hole 12 located in the direction of the side surface of the bucket, the opposite partition 5. 2 il.

Description

The utility model relates to metallurgy and can be used in continuous casting of metal.

An intermediate ladle for continuous casting is known, including a receiving and casting chambers separated by partitions, in which the upper, middle and lower rows of overflow openings are made, in the body of each partition there is a gas supply channel with a horizontal slot nozzle facing the pouring chambers (see RF patent No. 2185261, B22D 41/00).

The disadvantage of this tundish is the low quality of the cast steel. The creation of a continuous curtain of inert gas bubbles supplied vertically from a horizontal slit-shaped nozzle does not take into account the formation of steel flows from overflow glasses of the partitions of the intermediate bucket. Indeed, moving from a slit-like nozzle, a part of the smallest tiny gas bubbles enters the area of action of flooded jets of steel moving from overflow openings. This leads to the fact that the marked part of the gas bubbles together with the smallest non-metallic inclusions is carried away by the flooded jets of steel towards the pouring nozzles and further into the mold. In the intermediate bucket in question, a gas supply channel with a horizontal slotted nozzle is made in the body of each partition, the length of which is 0.7-0.8 of the width of the partition. The implementation of a continuous slot nozzle at the base of the partition weakens the cross section of the partition, while the section of the slot nozzle can change, which will lead to an uneven supply of inert gas over the cross section of the bucket and inefficient separation of non-metallic inclusions. All this reduces

quality of cast steel.

The closest analogue to the claimed object is an intermediate ladle for continuous casting of metal, including a lined body, inside which there are casting glasses for supplying metal to the mold, forming a receiving and casting chamber, a vertically mounted transverse partition with holes for metal passage, on the surface of which from the casting side a central protrusion is made to the entire height of the partition, and on the upper end surface of the partition in its middle part the front ledge, while the bucket is equipped with support elements installed in the casting chamber with holes for the passage of metal, while the supporting elements form two extreme and central casting cavities in the casting chamber (see RF patent No. 54320, B22D 41/00).

The disadvantage of this tundish is the low quality of the cast metal. Indeed, providing a uniform distribution of steel flows over the casting holes, the design of the elements of the intermediate ladle does not provide gas (argon) to the volume of the cast metal, which does not create conditions for the effective separation of non-metallic inclusions of 20 microns or less.

The technical problem solved by the utility model is to improve the quality of cast steel.

The problem is solved in that an intermediate ladle for continuous casting of metal, including a lined body, inside which there are casting glasses for supplying metal to the mold, forming a receiving and casting chamber, a vertically mounted transverse partition with holes for metal passage, on the surface of which from the casting side the chamber is made to the full height of the septum central protrusion, and on the upper end

In the middle part of the partition surface, an end protrusion is made, while the ladle is equipped with supporting elements installed in the casting chamber with holes for metal passage, while the supporting elements form two extreme and central casting cavities in the casting chamber according to the change, the supporting elements are provided with side blocks made in each of the supporting elements from the side of the extreme casting cavities symmetrically with respect to the transverse axis of the central casting cavity of the bucket, in each of the side blocks a slotted nozzle extending into the extreme filling cavities is made, and a channel for supplying gas is located in the support element, while the slotted nozzle is made in the form of the main and additional channels, the main channel is located from the plane drawn through the edge of the overflow hole located toward the transverse partition, perpendicular to the bottom of the bucket, in the direction of the transverse partition, and additional channels are located from the plane drawn through the edge of the overflow hole of the support element located to the side the side surface of the bucket, the opposite transverse partition.

The utility model is illustrated by drawings, where:

figure 1 schematically shows an intermediate bucket, a top view;

figure 2 - supporting element in isometry.

An intermediate ladle for continuous casting of metal includes a lined body 1 (Fig. 1), inside of which casting glasses 2 are installed for supplying metal to the mold (not shown in Fig.). The housing 1 is divided into a receiving 3 and casting 4 chambers of a vertically mounted transverse partition 5 with holes 6 for the passage of metal. From the side of the casting chamber 4, a central protrusion 7 is made to its entire height on the side surface of the partition 5. The central protrusion 7 of the partition 5 has a dihedral angle in cross section. On the upper end surface 8 of the partition 5 in its middle part there is an end protrusion 9. From the receiving side

chamber 3, the surface 10 of the partition 5 is made rectilinear. The bucket is equipped with support elements 11 installed in the casting chamber 4 (FIGS. 1, 2) with overflow holes 12 for metal passage. The supporting elements 11 can be made, for example, in the form of refractory plates. The supporting elements 11 (figure 1) form in the casting chamber 4 two extreme 13 and the Central 14 of the casting cavity. The supporting elements 11 (Figs. 1, 2) are provided with side blocks 15 made in each of the supporting elements 11 from the side of the extreme casting cavities 13 (Fig. 1) symmetrically with respect to the transverse axis 16 of the central casting cavity 14 of the ladle, with each of the side blocks 15 (figure 2) made a slotted nozzle 17 (figure 1, 2), which extends into the extreme filling cavity 13 (figure 1), and in the supporting element 11 (figure 2) is a channel 18 for supplying gas. The slotted nozzle 17 (FIGS. 1, 2) is made in the form of the main 19 (FIG. 2) and additional channels 20, 21, while the main channel 19 is located from the plane drawn through the edge 22 of the overflow hole 12 located towards the transverse partition 5 (Fig. 1), perpendicular to the bottom of the bucket 23, in the direction of the transverse partition 5, and additional channels 20 (Fig. 2) are located from the plane drawn through the edge 24 of the overflow hole 12 of the support element 11, located to the side of the side surface 25 (Fig. 1) bucket, opposite transverse baffle 5.

An intermediate ladle for continuous casting of metal works as follows.

Pre-transverse partition 5 (figure 1) is installed in the cavity of the housing 1 of the bucket. The supporting elements 11 are installed in the casting chamber 4. The supporting elements 11 (Fig. 1) form two extreme 13 and a central 14 casting cavity in the casting chamber 4. In this case, the supporting elements 11 (Fig. 1, 2) are installed in such a way that the side blocks 15 are located on the side of the extreme casting cavities 13 (Fig. 1) symmetrically with respect to the transverse

axis 16 of the Central casting cavity 14 of the bucket. After installing the partition 5 and the supporting elements 11 on the inner surface of the housing 1 (Fig. 1) of the bucket, a layer of refractory lining is applied.

The metal from the steel pouring ladle (not shown in FIG.) Enters the inventive ladle, where it moves from the receiving chamber 3 (FIG. 1) to the casting chamber 4 and then through the casting glasses 2 to the mold (not shown). When the metal enters the receiving chamber 3, part of its flow moves to the bottom of the chamber 3 and enters the pouring chamber 4 through the openings 6 of the partition 5, and the second part of the metal flow moving towards the partition 5 is distributed by the end protrusion 9 (Fig. 2) into two flows, which contributes to a uniform distribution of metal in the casting chamber 4 (Fig.1) of the bucket. In this case, the metal flows moving from the side of the receiving chamber 3 act on the rectilinear surface 10 of the partition 5 and its end protrusion 9 (Fig. 2).

The holes 12 form metal flows, protect it from the formation of funnels on the surface in the casting chambers and reduce the retraction of the coating slag in the casting glasses. When steel flows from the openings of the partitions, the metal is purged with an inert gas (argon). Small gas bubbles are supplied from the channels 19, 20, 21 (Fig. 2), while the rise of gas bubbles occurs between the main streams of flooded jets of steel, this ensures: optimal passage of gas bubbles in the vertical plane, which creates a good gas curtain for separating non-metallic inclusions less than 20 microns. This eliminates the drift of the flooded steel jets of gas bubbles along with flickering non-metallic inclusions towards the pouring glasses and then into the mold. The implementation of the slotted nozzle 17 in the form of channels 19, 20, 21 and jumpers ensures the conservation of the size of the slotted nozzle during operation of the bucket and a uniform supply of inert gas over the cross section

bucket. As a result, the tightening of non-metallic inclusions and slag particles in steel is significantly reduced. All this helps to improve the quality of the cast metal.

Claims (1)

An intermediate ladle for continuous casting of metal, including a lined case, inside which there are casting glasses for supplying metal to the mold, forming a receiving and casting chamber, a vertically mounted transverse partition with holes for metal passage, on the surface of which from the side of the casting chamber the entire height of the partition is made a central protrusion, and on the upper end surface of the partition in its middle part an end protrusion is made, while the bucket is equipped with the casting chamber with supporting elements with holes for the passage of metal, while the supporting elements form two extreme and central casting cavities in the casting chamber, characterized in that the supporting elements are provided with side blocks made in each of the supporting elements from the side of the extreme casting cavities symmetrically with respect to the transverse axis the central pouring cavity of the bucket, in each of the side blocks a slotted nozzle is made, which extends into the extreme casting cavities, and in the supporting element there is a channel for gas supply, while the slotted nozzle is made in the form of the main and additional channels, the main channel is located from the plane drawn through the edge of the overflow hole located towards the transverse partition, perpendicular to the bottom of the bucket, in the direction of the transverse partition, and additional channels are located from the plane drawn over the edge of the overflow hole of the support element located towards the side surface of the bucket, the opposite transverse partition.