JP2004512177A - Method and apparatus for controlling surface standing waves and turbulence in a continuous casting tank - Google Patents

Abstract

An improved molten metal bath system for casting molten metal and a method for improving the quality of a continuous casting process.
A molten metal bath system for casting molten metal includes: (a) a molten metal (2) for casting and formed to deliver the molten metal (2) for casting. A tank (1) having an inner wall and having a surface of a contained molten metal (2) formed thereon, and (b) an immersion having a discharge hole below an upper surface (9) of the molten metal (2). A discharge nozzle (3) and (c) a surface arranged between at least one inner wall surface (8) and the immersion discharge nozzle (3) and / or a submerged flow path modifying member (7, 11). The surface and / or the immersion channel modifying members (7, 11) prevent the formation of waves in the upper surface (9) of the molten metal (2).
[Selection] Figure 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The invention belongs to the field of continuous casting of steel.
[0002]
[Prior art]
In continuous casting of steel, molten metal is poured into a water-cooled copper mold from a large container called a "tundish" using a submerged discharge nozzle ("SEN").
The steel begins to solidify upon contact with the walls of the copper mold and the slab descends continuously according to the casting speed. Slab casting molds typically have a thickness of about 9 to 12 inches, while thin slab castings have a thickness of only about 2 to 4 inches. The width of the slab is generally very large, typically 60-72 inches.
A layer of mold flux maintained on the free surface of the metal (surface unrestricted at the top) protects the hot metal from the oxidizing effects of the atmosphere and provides a thin lubrication between the descending slab and the mold walls. Form a layer.
[0003]
Fluid flow studies in slab casting molds performed to date have demonstrated that the flow of molten metal in the mold has a significant effect on the surface and subsurface quality of the cast metal. The molten metal flowing out of the immersion discharge nozzle keeps a certain angle with respect to the horizontal direction and collides with a narrow wall. This results in the formation of upper and lower recycle streams, shown schematically in FIG. 1 as an overall flow pattern. The upper recirculation flow creates a standing wave on the free surface. The height of the waves generally varies with time. The fluctuating ordinary waves and associated turbulence at the free surface have been speculated to be a major cause of many of the defects in cast slabs prepared by this method.
[0004]
Due to other physical factors (e.g., slide gates and non-uniform nozzle weirs) and turbulence, the pattern on the two sides in the mold is not symmetrical and is assumed to change constantly over time. You. The wave height depends on the SEN depth, and generally the higher the immersion depth, the higher the wave. The height of the wave also depends on the angle of the discharge hole and the area of the opening. As the angle of the discharge hole becomes smaller and the opening area becomes smaller, the height of the generated wave generally becomes higher. Surface turbulence and standing waves are presumed to be the most important factors affecting casting quality.
The waves and recirculating flow oscillate between one side and the other, adversely affecting the quality of the casting.
[0005]
The flow is further deflected under the influence of the slide gate or the weir of the main nozzle. The deflected flow increases the opportunity for the slag to entrain the mold flux.
Increasing the downward blast angle relative to the horizontal can reduce surface turbulence and wave height by pushing the point of impact deeper into the mold.
However, when the point of impact is low, a thin, solidified shell is formed at the exit of the mold, with the danger of the mold being destroyed in connection with the formation of this shell. In addition, the deeper the recirculation flow, the further problems arise that inclusions are carried deeper and affect the quality of the cast metal.
[0006]
[Problems to be solved by the invention]
Accordingly, it is an object of the present invention to provide a flatter and less turbulent free surface, to make the flux flow more efficient, to allow more efficient removal of inclusions, and to reduce the potential for mold failure. It is to provide an apparatus and a method for continuous casting of metal, which can reduce the risk.
As a result, the surface and subsurface defects of the cast slab, which are generated by surface waves and turbulence, are expected.
[0007]
Although the field of steel casting has been described, it should be appreciated that other applications of the present invention provide many advantages as well as surface wave attenuation.
Such advantages will be apparent to one of ordinary skill in the art by observing in light of the present disclosure or by practicing the present invention.
[0008]
[Means for Solving the Problems]
The present invention includes a molten metal bath system for casting molten metal and a method for adjusting a molten metal flow for continuous casting.
Conceptually, the apparatus of the present invention includes a system of molten metal bath for casting, the system comprising:
(A) a tank formed to contain and distribute molten metal for casting, having an inner wall, and forming a surface of the molten metal accommodated in the upper portion;
(B) an immersion discharge nozzle extending below the surface, and
(C) a flow modifier arranged between at least one inner wall and the immersion discharge nozzle
It is composed of
The surface flow modifier (surface flow modifier) includes:
Used sufficiently close to the top surface of the molten metal to prevent the formation of waves at the top surface of the molten metal.
In addition, the submerged flow modifier is
Fully immersed at some depth below the top surface of the molten metal, close enough to the immersion discharge nozzle to affect the upper and lower recirculation flow patterns and the resulting turbulence and waves It is placed and used.
Further, the immersion channel modifying member has an effect of attenuating the standing wave on the surface of the molten metal in the continuous casting mold.
[0009]
Preferably, the surface or immersion channel modifying member is disposed on either side of the immersion discharge nozzle, and a series of surface or immersion channel modifying members are disposed and used on either side of the immersion discharge nozzle. be able to.
The surface flow modifying member is configured to be located directly above the free surface of the molten metal to prevent the formation of waves in the metal upper surface, but typically extends into the molten metal. Installed in
The immersion flow path modifying member is usually arranged below the surface of the molten metal at a position where the molten metal flow from the immersion discharge nozzle prevents generation of the upper and lower recirculation flows.
Typically, the molten metal surface is covered by a flux layer, and in some embodiments, at least a portion of the surface flow modifying member or support therefor extends such that it extends through the flux layer and / or the molten metal. Be placed.
In another embodiment, the entire submerged flow path modifying member is located in the molten metal below the flux layer.
[0010]
In general, the invention is not limited by the geometry of the surface or submerged flow path modifier, e.g., in one embodiment, the surface flow path modifier is formed to extend through the flux layer. Also, the shape may provide a relatively thin portion and a relatively wide portion formed to extend into the molten metal.
In another embodiment, the surface flow modifying member comprises a fork-shaped member formed to extend through the flux layer and a relatively wide portion formed to extend into the molten metal.
In yet another embodiment, the surface flow modifying member has a lower portion that tapers away from the immersion discharge nozzle so as to be generally trapezoidal and that faces the inner wall surface.
In some alternative embodiments, the flow path modifying member is located in the molten metal below the flux layer to reduce turbulence and wave generation due to the molten metal exiting the immersion discharge nozzle. Various geometric shapes can be employed.
In one embodiment of this type, the immersion channel modifying member may have a geometric shape such as, for example, a polygon, a trapezoid, or a cone.
However, these geometries, according to the present invention, have a variety of shapes, which satisfactorily prevent the effects of turbulence and waves and allow free and uniform flux flow over free metal surfaces. It should be understood that these are just a few examples of geometric shapes. Similarly, other geometries could be used to create a surface or submerged flow path modifying member with good results.
[0011]
The surface flow modifying member is brought into contact with, or functionally supported in close proximity to, the free metal surface by any suitable mechanical means, for example, via a bracket attached to the casting mold. Is also possible.
An attachment to a structure other than a casting mold may similarly support the surface flow modifying member.
In some embodiments of the present invention, the immersion channel modifying member can be attached to the immersion discharge nozzle.
As the material and the mounting procedure, for example, any material suitable for handling temperature-resistant materials such as refractory ceramics is adopted.
It is preferred that the surface or immersion channel modifying member not be in contact with the inner wall surface of the mold to avoid interrupting both the solidification of the metal and the flux flow into the casting mold.
[0012]
According to another aspect of the present invention, the use of flow modifying members or other turbulence and / or wave arresting means allows the submerged discharge nozzle to cause the molten metal stream to have a general downward flow. Allows orientation at horizontal or horizontal upward angles.
This feature assists in promoting more efficient inclusion removal when performing the casting process, and is oriented too low in orientation and too close to the downstream end of the casting mold. In addition, it is possible to avoid the danger of generating a high temperature with the emergence of a new solidified layer of a high-temperature molten metal.
[0013]
Also, the system of the molten metal tank for casting molten metal of the present invention,
(A) a bath containing and distributing molten metal for casting, having an inner wall surface, and forming a surface of the molten metal accommodated in the upper part;
(B) an immersion discharge nozzle extending below the surface,
(C) means for preventing the formation of waves in the upper surface of the molten metal;
Is included.
[0014]
Means for preventing the formation of waves in the upper surface of the molten metal may be mechanical (e.g., as a surface or immersion channel modifying member or equivalent mechanical structure or device), fluid (e.g., By the application of electromagnetic forces (eg, the use of external electromagnetic electrodes used for other purposes in the industry to control molten metal), or a gas flow directed against a free metal surface. Achievable.
[0015]
The present invention also includes a method of adjusting a molten metal flow for continuous casting, the method comprising:
(A) providing a bath containing molten metal for casting and formed to distribute, having an inner wall surface, and forming a surface of the molten metal contained therein;
(B) directing the flow of molten metal below the upper surface of the molten metal, preventing the formation of waves in the upper surface of the molten metal;
(C) extracting the molten metal from the tank to complete metal casting
It consists of
[0016]
Preventing the formation of waves in the upper surface of the molten metal can be achieved by the application of mechanical devices, fluid forces or electromagnetic forces as already mentioned.
[0017]
The immersion discharge nozzle can discharge the molten metal at an angle directed horizontally or horizontally upward, or slightly below horizontal. However, the angle is preferably an angle slightly downward in the horizontal direction (that is, 1 to 20 degrees below the horizontal direction).
[0018]
Thus, the present invention provides a simple way to mitigate the turbulence and wave behavior that is typically inherent in continuous metal casting processes.
In one embodiment, one refractory or other temperature resistant member (conceptually referred to as a "surface flow modifying member") is inserted or otherwise preferably from the top, and Adjacent, preferably on both sides (on both sides) of the immersion discharge nozzle, is brought into contact with the free surface.
In this way, the surface flow modifying member prevents the formation of the topmost recirculating flow and the waves formed thereby, thus significantly reducing the surface velocity and substantially flattening the free surface.
This is shown schematically in FIG. In some other embodiments of the present invention, a single refractory or other temperature resistant member (conceptually referred to as an "immersion flow path modifying member") is disposed below the surface of the molten metal, Of the normal recirculation flow pattern from the immersion discharge nozzle, thereby reducing the magnitude of the standing wave generated.
This type of arrangement is shown in FIGS. By using the method and apparatus of the present invention, defects due to free surface waves or turbulence can be reduced or substantially eliminated.
[0019]
Preferably, the surface or immersion channel modifying member does not contact the mold wall because the metal solidifies upon contact with the mold wall. Therefore, it is generally necessary to maintain a gap between the surface or the wall of the immersion channel modifying member.
[0020]
FIG. 6 is a side view of the mold having the surface flow channel modifying member described above.
This concept has been tested and proven to work on small scale aqueous models. The shape, dimensions, and location of the surface flow modifying member will depend on the particular system.
Neither the surface nor the immersion flow path modifier should slow the flow to the extent that the metal in proximity to the free surface is excessively condensed.
FIG. 7 shows an overall three-dimensional schematic diagram of the surface flow channel modifying member system. The surface flow modifying member reduces free surface turbulence so that the flow is symmetrical on both sides of the immersion discharge nozzle, significantly reducing the deflected flow.
[0021]
The method and apparatus of the present invention are expected to provide significantly better control over the continuous casting process and thereby significantly improve the quality of the cast metal produced.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
In addition to the features described above, other aspects of the invention will be readily apparent from the following description of the drawings and the exemplary embodiments. Here, the same reference numbers represent the same or equivalent structures throughout the several drawings.
[0023]
In accordance with the foregoing summary, preferred embodiments presently considered to include the best aspects of the invention are described in further detail below.
[0024]
FIG. 1 is an elevational cross-sectional view of a continuous casting system showing a general flow pattern in a continuous casting mold. FIG. 1 shows the continuous casting mold 1 and the molten metal 2 discharged from the immersion discharge nozzle 3 and flowing into the continuous casting mold 1.
The molten metal typically flows into the continuous casting mold 1, as indicated by streamlines 4, partially solidifies and flows out of the mold according to the shape of the mold (generally rectangular).
As the molten metal 2 advances through the mold, a layer of solidified steel 6 is formed along the inner wall surface 8 of the mold 1 and forms the outer shell of the newly cast slab.
Between the inner wall surface 8 and the layer of solidified steel 6 (outer shell), a layer of flux 9 present on the free surface 10 of the molten metal (free top surface 10 of the molten metal) is stretched (thickness: (Not shown), the metal is more likely to move downward through the mold.
[0025]
FIG. 2 is a cross-sectional front elevation view of a continuous casting system showing a general flow pattern and a pair of surface flow modifying members 11 in a continuous casting mold, according to one embodiment of the present invention. .
In another embodiment of the present invention, a pair of second surface flow channel modifying members 7 are disposed on each side of the immersion discharge nozzle 3.
The number and arrangement of the surface flow channel modifying members can be changed and used without departing from the scope of the present invention.
[0026]
FIG. 2 shows streamlines of the molten metal 2 having the flux layer 9 on the surface thereof, which generate turbulence affecting the free surface 10.
The surface flow path modifying member 11 extends into the metal surface 10 through the flux layer 9, but preferably does not contact the inner wall surface, shown as the inner wall surface 8, for example, below the surface of the molten metal 2.
The surface flow modifying member 11 reduces the turbulence in the molten metal 2 to reduce the generation of waves at the free surface 10 and maintains the free flow of the flux at the outer edge of the free surface 10, It allows the flux to flow uniformly along the sides of the mold without disturbing the solidified metal layer.
[0027]
FIG. 3 is an exploded view of another embodiment of the immersion discharge nozzle 3. In the embodiment shown in FIG. 3, the discharge holes of the immersion discharge nozzle are formed such that the molten metal exits the nozzle in a substantially horizontal direction 4.
[0028]
FIG. 4 is an exploded view of another embodiment of the immersion discharge nozzle 3. In the embodiment shown in FIG. 4, the opening of the immersion discharge nozzle is formed such that the molten metal exits the nozzle in the upward direction 4 from horizontal.
[0029]
FIG. 5 shows a front elevation cross-sectional view of a continuous casting system depicting another embodiment of the surface flow modifying member 11. As shown in FIG. 5, each of the surface flow channel modifying members 11 is formed to have a lower portion 16 extending outward so as to be away from the discharge nozzle 3.
[0030]
FIG. 6 is a cross-sectional view of a side elevation of the continuous casting system of FIG. FIG. 6 shows the surface flow channel modifying member member 11 arranged at the mounting position on the side of the mold 1.
As shown in FIG. 6, the surface flow modifying member 11 extends through the flux layer 9 and is formed to have a lower portion 16 long enough to be positioned below the level of the molten metal 2. Have been.
The lower portion 16 of the surface flow modifying member 11 is further formed narrow enough to maintain a space between the outer edge of the lower portion 16 and the inner wall surface 8 of the continuous casting mold 1. ing. Maintaining the space between the lower part and the inner wall surface 8 of the mold allows the flux layer 9 on the molten metal surface 10 to flow more continuously without disturbing solidification of the metal. I do.
[0031]
FIG. 7 is a partial perspective sectional view of a side surface of the continuous casting system of FIG. 2. FIG. 7 shows an additional surface channel modifying member 7 of another embodiment.
[0032]
FIG. 8 is a side cut elevation view of another embodiment of the continuous casting system of FIG. As shown in FIG. 8, the surface flow modifying member 11 comprises an upper body portion 12 which is three-dimensionally stable and is fixed to a suitable external member, and is externally supported thereby.
In this embodiment, it is possible to form a plurality of surface flow modifying members having different shapes so as to be supported externally.
[0033]
FIG. 9 is a side elevation cutaway view of another embodiment of the continuous casting system of FIG. As shown in FIG. 9, the surface flow channel modifying member 11 is formed to have a relatively thin portion 13 that penetrates the flux layer 9 and extends into the molten metal 2.
The surface flow path modifying member 11 is further formed to have a relatively wide portion 17 integrally formed with the relatively thin portion 13. In one embodiment shown in the figures, the surface channel modifying member 11 is arranged such that a relatively wide portion 17 is completely immersed in the molten metal 2.
[0034]
FIG. 10 is a side elevation cutaway view of another embodiment of the continuous casting system of FIG. As shown in FIG. 10, the surface flow path modifying member 11 is formed so that the upper part is located above the flux layer 9 and the lower part penetrates the flux layer 9 and extends into the molten metal 2. It has a fork 18 having a plurality of teeth.
[0035]
FIG. 11 is a cutaway view of a front elevation of a continuous casting system, illustrating another embodiment of the present invention. The surface flow channel modifying member shown in FIG.
As shown in FIG. 11, each surface flow channel modifying member is located on one side of the immersion discharge nozzle 3 and is disposed between the immersion discharge nozzle 3 and the inner wall surface 8 of the mold 1. I have.
The surface flow path modifying member 15 is disposed sufficiently close to the flux layer 9 so as to be in contact with the flux layer 9, and is formed so as not to extend through the flux layer 9.
The surface flow path modifying member 15 has a sufficient flatness such that when the waves are formed on the free surface 10 of the molten metal 2 and the waves are formed on the free surface 10 of the molten metal 2, these waves can be suppressed. A lower contact portion 19 having a flat surface with
[0036]
In FIG. 11, the surface flow channel modifying member 15 includes a support member 20 formed so as to be integrally fixed to the external support member 21. The external support member 21 is formed of any external support means that is three-dimensionally stable.
[0037]
FIG. 12 is a cross-sectional side elevation view of the continuous casting system of FIG. 11 with a surface flow modifying member 20 instead of the surface flow modifying member of FIG.
As shown in FIG. 12, the side portion of the surface flow channel modifying member 20 is disposed so as not to be in contact with the side portion of the mold 1 although it is sufficiently close to the side portion.
[0038]
Other embodiments of the present invention can be ascertained by referring to FIGS. In particular, in this embodiment, the immersion channel modifying member 22 is located below the free surface 10 of the molten metal 2 and below the flux layer 9.
Each immersion flow path modifying member 22 is disposed on one side of the immersion discharge nozzle 3 and is positioned so as to modify the natural flow 4 of the molten metal 2 coming out of the discharge nozzle.
As can be seen from a comparison with FIG. 1, the immersion channel modifying member 22 is at a substantially horizontal angle from the immersion discharge nozzle 3 when the molten metal flow 4 is directed in a direction that is not optimal. Even the continuous casting process suppresses the generation of strong upward and downward recirculating channel patterns 4 ', usually caused by immersion discharge nozzles.
[0039]
The position of the immersion channel modifying member 22 can be fixed by various means. As shown in FIGS. 13 and 14, the immersion channel modifying member 22 is fixed at a part of the immersion discharge nozzle 3 by any appropriate attachment means 23 capable of withstanding the high temperature of the molten metal 2. No problem.
For example, high melting point steel or ceramic brackets are available. As shown in FIG. 15, the immersion channel modifying member 22 can similarly be fixed in position by being attached to a sufficiently stable support member 24 located on the free surface 10 of the molten metal 2. is there. In each of these cases, it is preferable to maintain a gap between the inner wall surface 8 of the mold 1 and the immersion flow path modifying member 22 for the reasons already described.
[0040]
Yet another embodiment of the present invention is shown in FIGS. In this embodiment of the present invention, in addition to the immersion discharge nozzle 3 shown in FIG. 5, an immersion channel modifying member 22 and a mounting means 23 shown in FIGS.
As described above, in order to minimize the standing wave and the turbulent flow, it is generally desirable that the flow path 4 of the molten metal flowing from the immersion discharge nozzle 3 is slightly directed downward.
16 to 18 show that the immersion flow path modifying member 22 of the present invention can be used together with the immersion discharge nozzle 3 to obtain an equivalent effect or a greater effect.
By operating in the same way as the handling of the immersion flow path modifying member 22 in FIGS. 13 to 15, the immersion flow path modifying member 22 shown in FIGS. It can be effectively modified to reduce the generated recirculation channel pattern, reduce or substantially eliminate the intensity of turbulence and standing waves.
[0041]
The immersion channel modifying member 22 in FIGS. 13-15 and 16-18 is illustrated as being substantially square in cross section.
However, in preparing the immersion channel modifying member 22 for use in accordance with the spirit of the present invention, many geometric figures can be used.
For example, the immersion flow path modifying member 22 can effectively modify the polygonal, trapezoidal, cylindrical, spherical, conical, and even the molten metal flow 4 from the immersion discharge nozzle 3 to reduce turbulence or standing waves. It can be any other shape that is practical or can be removed or removed.
Also, the immersion channel modifying members 22 are not limited to specific dimensions, and should be selected based on the particular application to which they will be applied. Similarly, the proper position of the immersion flow path modifying member 22 in relation to the immersion discharge nozzle 3 and the free surface 10 of the molten metal is changed according to the characteristics and conditions of the applied object so as to obtain the best result. It is also possible.
For example, although the immersion flow path modifying member 22 is shown to be located clearly below the upper surface 10 of the molten metal 2 and the flux layer 9, a part of the immersion flow path modifying member is formed by a flux layer and / or Or it may come into contact with the upper surface of the molten metal.
[0042]
The immersion channel modifier 22 is also contemplated to perform additional functions, for example, attaching or incorporating certain sensors or other devices to the immersion channel modifier 22. It is possible.
Examples of these sensors and devices include temperature monitoring, oxygen sensing, and means for determining and controlling the level of molten metal in the mold.
Such sensors or devices can be used individually or in various combinations. The sensors and / or other devices can be further connected to external equipment, for example, via special conduits or means used to fix the position of the immersion flow path modifying member 22.
[0043]
Those skilled in the art will recognize that different shapes of immersion flow path modifying members 22 can be used to affect a single immersion discharge nozzle 3.
Similarly, the technical scope of the present invention is not limited to a specific number of immersion channel modifying members 22 that can be used for a single application.
That is, it is possible to use one or several immersion channel modifying members to alter the flow 4 of the molten metal. It is also contemplated that the immersion flow path modification member 22 can be used with the above-described surface flow path modification member 11 to further reduce turbulence and standing waves. In order to obtain the required effect, any combination of the immersion flow path modifying member 22 and the surface flow path modifying member 11 can be used.
[0044]
The preferred embodiments disclosed herein are not intended to comprehensively define the scope of the invention nor to limit it unnecessarily.
The preferred embodiments have been chosen and described in order to explain the spirit of the present invention so that those skilled in the art can carry out the present invention.
Having shown and described the preferred embodiments of the invention, it is to be understood that, within the capabilities of those skilled in the art, the present invention is set forth by the appended claims, text and references, with teachings incorporated herein. Without departing from the spirit of the invention, it is possible to make alternatives or modifications of the invention and to carry out the invention by replacement of equivalent materials or arrangements or through equivalent process steps. is there. Accordingly, the invention is not limited by the scope of the claims and their equivalents.
[Brief description of the drawings]
FIG.
1 is a front elevational cross-sectional view of a continuous casting system showing a typical flow pattern in a continuous casting mold.
FIG. 2
1 is a cross-sectional elevational view of a continuous casting system showing a general flow pattern in a continuous casting mold and a surface flow modifying member in accordance with one embodiment of the present invention.
FIG. 3
FIG. 3 is an exploded view of a front elevation view of a submerged discharge nozzle with a horizontal molten metal discharge in accordance with one embodiment of the present invention.
FIG. 4
FIG. 4 is an exploded view of a cross-sectional view at the front elevation of a submerged discharge nozzle with an upwardly flowing molten metal discharge in accordance with one embodiment of the present invention.
FIG. 5
FIG. 5 is a front elevational view of a continuous casting system showing a general flow pattern in a continuous casting mold and outwardly tapering surface flow modifying members, according to one embodiment of the present invention. It is an exploded view of a sectional view.
FIG. 6
1 is a side schematic view of a continuous casting system showing a general flow pattern in a continuous casting mold and a surface flow modifying member according to one embodiment of the present invention.
FIG. 7
FIG. 7 is a schematic perspective view of a continuous casting system showing a general flow pattern in a continuous casting mold and at least one surface flow modifying member according to one embodiment of the present invention.
FIG. 8
1 is a side schematic view of a continuous casting system showing a continuous casting mold and an externally supported surface flow modifying member, according to one embodiment of the present invention. FIG.
FIG. 9
1 is a side schematic view of a continuous casting system showing a continuous casting mold and a paddle-shaped surface flow path modifying member according to one embodiment of the present invention.
FIG. 10
1 is a schematic side view of a continuous casting system showing a continuous casting mold and a surface flow modifying member with a forked member having a plurality of teeth, according to one embodiment of the present invention. FIG.
FIG. 11
1 is a cross-sectional elevational view of a continuous casting system showing a continuous casting mold and a surface flow modifying member according to one embodiment of the present invention.
FIG.
1 is a schematic side view of a continuous casting system showing a continuous casting mold and a surface flow modifying member according to one embodiment of the present invention.
FIG. 13
In an exploded, partially cutaway view of an alternative embodiment of the present invention, the submerged flow path modification member in the figure is used to change the flow of molten metal from the submerged discharge nozzle of FIG.
FIG. 14
In an exploded, partially cutaway view of an alternative embodiment of the present invention, the submerged flow path modification member in the figure is used to change the flow of molten metal from the submerged discharge nozzle of FIG.
FIG.
In an exploded, partially cutaway view of an alternative embodiment of the present invention, the submerged flow path modification member in the figure is used to change the flow of molten metal from the submerged discharge nozzle of FIG.
FIG.
FIG. 14 is a diagram illustrating the immersion flow path modifying member of FIG. 13 used to change the flow of the molten metal from the immersion discharge nozzle of FIG. 5.
FIG.
FIG. 16 is a diagram illustrating the immersion flow path modifying member of FIG. 14 used to change the flow of the molten metal from the immersion discharge nozzle of FIG. 5.
FIG.
FIG. 16 is a diagram illustrating the immersion flow path modifying member of FIG. 15 used to change the flow of the molten metal from the immersion discharge nozzle of FIG. 5.
[Explanation of symbols]
1 Continuous casting mold
2 molten metal
3 Immersion discharge nozzle
4 Flow of molten metal (streamline)
6 Solidified steel shell
7 Flow path modification member
8 Inner wall surface
9 Flux layer
10 Free surface (liquid level of molten metal)
11, 15 Surface flow channel modifying member
22 Immersion channel modifying member

Claims (45)

(A) a tank containing a molten metal for casting and formed so as to send out the molten metal for casting, having an inner wall, and a surface of the contained molten metal formed on an upper portion;
(B) an immersion discharge nozzle extending below the metal surface;
(C) between at least one inner wall and the immersion discharge nozzle, a surface flow channel modifying member disposed sufficiently close to the surface of the molten metal to prevent the formation of waves in the surface of the molten metal; A system of molten metal bath for casting the constituted molten metal. The molten metal tank system according to claim 1, further comprising at least one surface channel modifying member on one side of the immersion discharge nozzle. The at least one surface flow channel modifying member,
The system of claim 1, wherein the system extends into the surface of the molten metal. The molten metal surface,
The molten metal bath system according to claim 1, further comprising a flux layer, wherein the at least one surface flow modifying member extends into the flux layer. The molten metal surface,
The molten metal bath system according to claim 1, further comprising a flux layer, wherein the at least one surface flow modifying member extends into the flux layer and into the molten metal. The at least one surface flow channel modifying member,
The molten metal bath system according to claim 5, comprising a relatively narrow portion formed to extend through the flux layer and a relatively wide portion formed to extend into the molten metal. . The at least one surface flow channel modifying member,
6. The molten metal bath system according to claim 5, comprising a forked member having a plurality of teeth. The at least one surface flow channel modifying member,
6. The molten metal bath system according to claim 5, comprising a fork-shaped member having a plurality of teeth formed to extend through the flux layer and into the molten metal. The at least one surface flow channel modifying member,
The molten metal tank system according to claim 1, further comprising a lower structure tapered from the immersion discharge nozzle. The immersion discharge nozzle,
The molten metal bath system of claim 1, wherein the molten metal bath system is configured to direct the flow of molten metal at a horizontal, horizontal upward, or slightly downward horizontal angle. (A) a tank containing a molten metal for casting, and formed so as to send out the molten metal for casting, having an inner wall, and a surface of the contained molten metal formed on an upper portion;
(B) an immersion discharge nozzle extending below the metal surface;
(C) a system for casting molten metal comprising: means for inhibiting the formation of waves in the upper surface of the molten metal. (A) preparing a bath containing a molten metal for casting and formed so as to send out the molten metal for casting, having an inner wall, and having a surface of the contained molten metal formed thereon;
(B) directing the flow of the molten metal below the upper surface of the molten metal and preventing the formation of waves in the upper surface of the molten metal;
Extracting the molten metal from the tank to form a metal casting,
A method for adjusting a molten metal flow for continuous casting comprising: Inhibiting the formation of waves in the upper surface of the molten metal,
The method for regulating molten metal flow according to claim 11, which is performed by mechanical force. Inhibiting the formation of waves in the upper surface of the molten metal,
12. The method for regulating molten metal flow according to claim 11, wherein the method is performed by hydrodynamic force. Inhibiting the formation of waves in the upper surface of the molten metal,
The method for regulating molten metal flow according to claim 11, wherein the method is performed by electromagnetic force. The molten metal,
12. The method for regulating molten metal flow according to claim 11, wherein the molten metal stream is directed at an angle pointing in the horizontal direction, upward in the horizontal direction, or slightly downward in the horizontal direction. (A) a tank containing a molten metal for casting and formed so as to send out the molten metal for casting, has an inner wall, and a surface of the surface of the contained molten metal is formed at an upper portion;
(B) an immersion discharge nozzle extending below the metal surface;
(C) between at least one inner wall and the immersion discharge nozzle, at least one immersion flow path modification located sufficiently close to the surface of the molten metal to prevent the formation of waves in the surface of the molten metal. A molten metal bath system for casting molten metal composed of components. On either side of the immersion discharge nozzle,
18. The molten metal bath system according to claim 17, comprising at least one immersion channel modifying member. The at least one immersion channel modifying member includes:
18. The molten metal bath system according to claim 17, wherein the system is mounted and supported on an immersion discharge nozzle. The at least one immersion channel modifying member includes:
18. The molten metal bath system of claim 17, supported by attachment to a support member located above the metal top surface. Means for attaching the immersion channel modifying member to a support member,
21. The molten metal bath system of claim 20, wherein the system is configured to extend through a metal top surface. Means for attaching the immersion channel modifying member to the support member,
22. The molten metal bath system according to claim 21, which acts as a surface flow channel modifying member. The molten metal surface,
18. The molten metal bath system of claim 17, including a flux layer, wherein a portion of at least one of the immersion flow path modifying members contacts the flux layer. The immersion channel modifying member,
The system of claim 17, further comprising a monitoring function. The immersion channel modifying member,
25. The molten metal bath system of claim 24, wherein the system is configured to monitor the temperature of the molten metal. The immersion channel modifying member,
25. The system of claim 24, wherein the system is configured to monitor the level of molten metal in the vessel. The immersion channel modifying member,
26. The molten metal vessel system of claim 24, wherein the molten metal vessel system is configured to monitor an oxygen level in the molten metal. The immersion channel modifying member,
18. The system of claim 17, wherein the system is used with at least one surface flow modifying member. The cross section of the immersion channel modifying member,
18. The molten metal bath system according to claim 17, wherein the system is polygonal. The cross section of the immersion channel modifying member,
18. The molten metal bath system of claim 17, wherein the system is trapezoidal. The cross section of the immersion channel modifying member,
18. The molten metal bath system of claim 17, wherein the system is circular. The immersion channel modifying member,
18. The molten metal bath system of claim 17, wherein the system is conical. The immersion discharge nozzle,
18. The molten metal bath system of claim 17, wherein the system is configured to direct the molten metal at a horizontal, horizontal upward, or horizontal slightly downward angle. (A) a tank containing a molten metal for casting, and formed so as to send out the molten metal for casting, having an inner wall, and a surface of the contained molten metal formed on an upper portion;
(B) an immersion discharge nozzle extending below the upper surface of the molten metal for supplying the molten metal to the tank;
(C) a molten metal disposed between at least one of the inner wall surfaces and the immersion discharge nozzle and exiting from the immersion-disposed discharge nozzle so as to modify a natural flow pattern of the molten metal in the tank. At least one immersion flow path modifying member positioned within the flow path of the molten metal, thereby reducing turbulence in the molten metal and preventing the formation of waves in the upper surface of the molten metal;
Molten metal bath system for casting molten metal composed of: (A) preparing a bath containing a molten metal for casting and formed so as to send out the molten metal for casting, having an inner wall, and having a surface of the contained molten metal formed thereon;
(B) using an immersion discharge nozzle to direct the flow of molten metal below the upper surface of the molten metal;
(C) providing at least one immersion flow path modifying member positioned between the inner wall surface and the immersion discharge nozzle and positioned in the flow path of the molten metal flow exiting the immersion discharge nozzle;
(D) the natural flow pattern of the molten metal in the vessel so as to reduce turbulence in the molten metal and to prevent the formation of waves in the upper surface of the molten metal using the immersion flow path modifying member. To modify
(E) extracting the molten metal from the vessel to form a metal casting;
A method for improving the quality of a continuous metal casting process comprising: The at least one immersion channel modifying member includes:
The method for improving the quality of a continuous metal casting process according to claim 35, wherein the metal continuous casting process is mounted and supported on the immersion discharge nozzle. The at least one immersion channel modifying member includes:
The method of improving the quality of a continuous metal casting process according to claim 35, wherein the molten metal is mounted and supported on a support member located above a top surface of the molten metal. Means used for fixing the immersion channel modifying member to the support member,
38. The method of improving the quality of a continuous metal casting process according to claim 37, wherein the method is configured to extend through a top surface of the molten metal. Means used for fixing the immersion channel modifying member to the support member,
39. The method of improving the quality of a continuous metal casting process according to claim 38, wherein the method acts as a surface flow modifying member. One or more surface flow channel modifying members,
38. The method of improving the quality of a continuous metal casting process according to claim 37, wherein the method is used with at least one said submerged flow path modifying member. One or more surface flow channel modifying members,
38. The method of improving the quality of a continuous metal casting process according to claim 37, comprising configuring one or more sensors on or on the surface. The sensor is
42. The method for improving the quality of a continuous metal casting process according to claim 41, wherein the temperature of the molten metal is monitored. The sensor is
42. The method for improving the quality of a continuous metal casting process according to claim 41, wherein the oxygen level of the molten metal is monitored. The sensor is
42. The method of improving the quality of a continuous metal casting process according to claim 41, wherein the level of molten metal in the vessel is monitored. The molten metal,
42. The method for improving the quality of a continuous metal casting process according to claim 41, wherein the immersion discharge nozzle is oriented at an angle toward the horizon, above the horizon or slightly below the horizon.

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