CA2284190A1 - Improved continuous casting mold and method - Google Patents
Improved continuous casting mold and method Download PDFInfo
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- CA2284190A1 CA2284190A1 CA002284190A CA2284190A CA2284190A1 CA 2284190 A1 CA2284190 A1 CA 2284190A1 CA 002284190 A CA002284190 A CA 002284190A CA 2284190 A CA2284190 A CA 2284190A CA 2284190 A1 CA2284190 A1 CA 2284190A1
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- Prior art keywords
- cooling
- liner assembly
- mold liner
- mold
- molten metal
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 14
- 238000001816 cooling Methods 0.000 claims abstract description 60
- 229910052751 metal Inorganic materials 0.000 claims abstract description 39
- 239000002184 metal Substances 0.000 claims abstract description 39
- 238000005266 casting Methods 0.000 claims abstract description 30
- 238000007654 immersion Methods 0.000 claims abstract description 8
- 230000007704 transition Effects 0.000 claims description 11
- 230000005499 meniscus Effects 0.000 claims description 6
- 230000003292 diminished effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 230000002028 premature Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052775 Thulium Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0408—Moulds for casting thin slabs
Abstract
An improved mold assembly (12) for a continuous casting machine includes a mold liner assembly (30) having an inner surface (32) defining a casting space (14) in which molten metal is shaped and cooled, an immersion nozzle (20), terminating within the casting space (14), for introducing molten metal into the casting space (14), and selective cooling structure (34) for selectively cooling the mold liner assembly (30) in such a manner that cooling is directed in varying intensities to different portions of the inner surface (32) of the mold liner assembly (30) according to predetermined circulation patterns (26) in the molten metal, whereby heat transfer inequality as a result of convection is accommodated over the entire inner surface of the mold liner assembly (30).
Description
IMPROVED CONTINUOUS CASTING MOLD AND METHOD
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates broadly to the field of metal production and casting. More specifically, this invention relates to an improved mold for a continuous casting system that has a longer useful life, improves the uniformity of heat removal, and turns out a better product than conventional continuous casting molds do.
2. Description of the Prior Art A conventional continuous casting mold includes a number of liner plates, usually made of copper, and outer walls surrounding the liner plates.
The liner plats define a portion of the mold that contacts the molten metal during the casting process. Parallel vertically extending cooling water circulation slots or passageways are provided between the outer walls and the liner plates to remove heat from the liner plates. During operation, water is introduced to these slots, usually at the bottom end of the mold, from a water supply via an inlet plenum that is in communication with all of the slots in a liner plate. The cooling effect so achieved causes an outer skin of the molten metal to solidify as it passes through the mold. The solidification is then completed after the semi-solidified casting leaves the mold by spraying additional coolant, typically water, directly onto the casting. This method of metal production is highly efficient, and is in wide use in the United States and throughout the world.
In most continuous casting machines the molten metal is introduced into the mold from a tundish through a refractory nozzle that is submerged within the mold. As a result of the constant introduction of molten metal through the nozzle ports, the shape of the mold, and the cooling effect that is applied by the hotface of the mold, hot metal or molten metal circulation currents form within the mold and, through the well documented heat transfer medium of convection, cause the cooling rate to be uneven over the surface of the hotface. This can cause uneven deterioration of the hotface, and contribute to premature mold failure. It can also impact adversely on the quality of the cast product. One example of this may be found in the operation of funnel-type molds. A funnel-type mold is used to cast a thin slab product, and includes, at the introduction end of the mold, a relatively wide central region, relatively narrow end regions, and transition regions between the central region and the end regions. The refractory nozzle is inserted into the central region, and, it has been found in practice, premature wear and failure of the mold tend to occur at the transition regions.
One of the reasons for this premature wear is felt to be that the rush of incoming molten metal that exits the outlets of the immersion nozzle cause the adjacent inner surface of the solidifying product to be reheated, preventing additional cooling from occurring as the skin travels through this area and in some extreme cases, causes reheating .end remelting of the skin to occur. That causes the skin to be thinner in those areas surrounding the outlet ports, which in turn raises the surface temperature of the product and the surface temperature of the mold liner.
To the inventors' knowledge, no workable solution to this problem has yet been proposed.
it is clear that a need exists for an improved continuous casting mold and method of continuous casting that compensates for the destructive effect of hot metal circulation patterns within the continuous casting mold.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide an improved continuous casting mold and a method of continuous casting that compensates for the destructive effect of hot metal circulation patterns within the continuous casting mold.
In order to achieve the above and other objects of the invention, an improved mold assembly for a continuous casting machine includes a mold liner assembly having an inner surface defining a casting space in which molten metal is shaped and cooled; an immersion nozzle, terminating within the casting space, for introducing molten metal into the casting space; and selective cooling structure for selectively cooling the mold finer assembly in such a manner that cooling is directed in varying intensities to different portions of the inner surface of the mold liner assembly according to predetermined circulation patterns in the molten metal, whereby heat transfer inequality as a result of convection is accommodated over the inner surface of !he mold liner assembly.
According to a second aspect of the invention, a method of operating a continuous casting machine of the type having a mold liner assembly that has an inner surface defining a casting space in which molten metal may be shaped and cooled, includes steps of: (a) introducing molten metal into the casting space;
and (b) selectively cooling the mold liner assembly in varying intensities at different portions of the inner surface of the mold liner assembly according to predetermined circulation patterns in the molten metal, whereby heat transfer inequality as a result of convection is accommodated over the inner surface of the mold liner assembly, product quality is enhanced and mold life is lengthened.
These and various other advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages. and the objects obtained by its use, reference should be made to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a preferred embodiment of the invention.
FIGURE 1 is a diagrammatical view of a continuous casting machine that is constructed according to a preferred embodiment of the assembly 30 in the transition region I I I in order to accommodate the increased heat transfer that has been planned to occur at that region as a result of the circulation patterns 26 within the casting space 14. In this embodiment of the invention, the distance Tb - Tm is increased. A second aspect of this embodiment of the invention is that decreased cooling is intentionally directed to the relatively wide central region i and the outermost slots in region II, and this is done by decreasing the distance '-b - Tm.
Another aspect of the invention can, in order to direct cooling at the areas of the mold finer that need it the most, be employed together or in lieu of the variable thickness residual Tb - Tm discussed above. As is illustrated in FIGURE 2, the deepened slot portion 40 that is machined to be deeper than the base slot portion 38 extends for a vertical distance Lm. The second aspect of the invention involves varying the length Lm of the individual slots so that the length is greater in those slots where an enhanced cooling effect is desired, which again in the preferred embodiment is mainly in the transition region III. FIGURE 4 schematically depicts the length profile of the deepened slot portions 40 of the slots.
A preferred example of the construction described above is depicted in FIGURE 2, wherein the cooling slots are numbered, beginning from the center of region I and ending at ',he distal end of region II, as slots 1 through 19.
The chart below provides exemplary values of Tm, Tb - Tm and Lm for each of slots through 19.
SLOT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1f Tm~"", 25 24 23 22 22 21 21 20 20 20 20 20 21 22 22 23 24 25 2:
25Tb Tm 0 1 2 3 3 4 4 5 5 5 5 5 4 3 3 2 1 0 0 ~",(mm)8 8 8 8 10 12 14 16 18 20 20 18 16 14 12 10 8 8 8 Alternatively, the length of the slots could be varied without varying .
the slot depths, or the slot depths could be varied without varying the length of the slots. In addition, the principles of this invention could be applied to other types of continuous casting machines than that shown in the attached drawings.
It is to be understood, however, that even though numerous PCTlItS ~~/05514 ~EAIUS 0 9 FF9 1999 invention;
FIGURE 2 is a fragmentary cross-sectional view taken through one component of a mold assembly that is constructed according to the invention;
and FIGURE 3 is a second fragmentary cross-sectional view taken through another component of the system that is depicted in FIGURES 1 and 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS) Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views, and referring in particular to FIGURE 1, a continuous casting machine 10 that is constructed according to a preferred embodiment of the invention includes a mold assembly 12 that defines a casting space 14 in which molten metal may be shaped and cooled.
Continuous casting machine further includes a tundish 16 in which a supply of molten metal 18 is stored, and an immersion nozzle 20 for introducing the molten metal 18 from the tundish 16 into the casting space 14 that is defined by the mold assembly 12. A slide gate 22, as is conventional, is positioned above the immersion nozzle 20 for controlling the flow of molten metal 18 therethrough.
A distal end of immersion nozzle 20 has a number of outlets 24, through which the molten metal 18 is introduced into the casting space 14. As a result of the shape of the mold assembly 12 and the introduction of the molten metal 18 into the casting space 14, circulation patterns 26 are formed in the molten metal that is within the casting space 14, as is graphically depicted in FIGURE 1. As is described above, the effects of the circulation patterns 26 contribute to premature mold deterioration and failure, particularly in the meniscus region 28 of the mold assembly 12.
Referring now to FIGURES 2 and 3, it will be seen that the mold 12 includes a mold liner assembly 30 that includes an inner surface 32 that defines the casting space 14. According to one important aspect of the invention, the mold liner assembly 30 incorporates a selective cooling arrangement 34 for selectively cooling the mold liner assembly 30 in such a manner that cooling is directed in varying intensities to different portions of the inner surface 32 of the mold liner assembly 30 according to the predetermined circulation patterns 26 AMENOEfl SHEEt (shown in FIG. 1) in the molten metal, so that heat transfer inequality as a result of convection is accommodated over the inner surface of the mold liner assembly.
As is conventional, the mold liner assembly 30 has a number of cooling slots defined in the mold liner for conducting heat away from the inner surface 32 of the mold liner assembly 30. As may be seen in FIGURE 3, the cooling slots 36 according to this embodiment of the invention include a base slot portion 38 that is relatively parallel to the inner surface 32 of the mold liner assembly 30 and is machined to a depth that defines a mold wall thickness Tb that is equal to the distance between the bottom of the base slot portion 38 and the inner surface 32.
In the meniscus region 28, as may also be best seen in FIGURE 3, the cooling slot 36 includes a deepened slot portion 40 that is machined to be deeper than the base slot portion 38, and defines a minimum thickness Tm between the bottom of slot portion 40 and the inner wall 32 of the mold liner assembly 30. The deepened slot portion 40 communicates with a plenum 42 for conducting water away from the slot 36 during operation, as is well known in this area of technology.
Since the th ickness Tm at the deepened slot portion 40 is less than the thickness Tb at the base slot portion 38, an enhanced cooling effect is directed to the area of the mold proximate to the meniscus region 28, the extent of which may be measured by the difference in thickness between the two slot areas, or Tb-Tm, as is shown diagrammatically in FIGURE 3.
FIGURE 2 shows the bottom 44 of the slot portion 40 at the meniscus region 28, as well as the slot bottom 46 at the base slot portion 38.
As may be seen in FIGURE 2, which is a cross section taken horizontally across the mold wall as shown by lines 2-2 in FIGURE 3, this distance T~Tm is intentionally varied along the horizonal extent of the mold so as to selectively direct enhanced cooling to certain portions of the inner surface of the mold liner assembly, and, to direct a diminished cooling effect to other portions of the mold liner assembly. The mold liner assembly 30 depicted in FIGURE 2 is that of a conventionally shaped funnel mold. It includes a first relatively wide central region, which is identified by Roman numeral I, relatively narrow end regions (II), and transition regions (III) between the central regions I and the end regions II. In one embodiment of the invention, enhanced cooling is directed to the inner surface 32 of the mold liner .7.
characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates broadly to the field of metal production and casting. More specifically, this invention relates to an improved mold for a continuous casting system that has a longer useful life, improves the uniformity of heat removal, and turns out a better product than conventional continuous casting molds do.
2. Description of the Prior Art A conventional continuous casting mold includes a number of liner plates, usually made of copper, and outer walls surrounding the liner plates.
The liner plats define a portion of the mold that contacts the molten metal during the casting process. Parallel vertically extending cooling water circulation slots or passageways are provided between the outer walls and the liner plates to remove heat from the liner plates. During operation, water is introduced to these slots, usually at the bottom end of the mold, from a water supply via an inlet plenum that is in communication with all of the slots in a liner plate. The cooling effect so achieved causes an outer skin of the molten metal to solidify as it passes through the mold. The solidification is then completed after the semi-solidified casting leaves the mold by spraying additional coolant, typically water, directly onto the casting. This method of metal production is highly efficient, and is in wide use in the United States and throughout the world.
In most continuous casting machines the molten metal is introduced into the mold from a tundish through a refractory nozzle that is submerged within the mold. As a result of the constant introduction of molten metal through the nozzle ports, the shape of the mold, and the cooling effect that is applied by the hotface of the mold, hot metal or molten metal circulation currents form within the mold and, through the well documented heat transfer medium of convection, cause the cooling rate to be uneven over the surface of the hotface. This can cause uneven deterioration of the hotface, and contribute to premature mold failure. It can also impact adversely on the quality of the cast product. One example of this may be found in the operation of funnel-type molds. A funnel-type mold is used to cast a thin slab product, and includes, at the introduction end of the mold, a relatively wide central region, relatively narrow end regions, and transition regions between the central region and the end regions. The refractory nozzle is inserted into the central region, and, it has been found in practice, premature wear and failure of the mold tend to occur at the transition regions.
One of the reasons for this premature wear is felt to be that the rush of incoming molten metal that exits the outlets of the immersion nozzle cause the adjacent inner surface of the solidifying product to be reheated, preventing additional cooling from occurring as the skin travels through this area and in some extreme cases, causes reheating .end remelting of the skin to occur. That causes the skin to be thinner in those areas surrounding the outlet ports, which in turn raises the surface temperature of the product and the surface temperature of the mold liner.
To the inventors' knowledge, no workable solution to this problem has yet been proposed.
it is clear that a need exists for an improved continuous casting mold and method of continuous casting that compensates for the destructive effect of hot metal circulation patterns within the continuous casting mold.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide an improved continuous casting mold and a method of continuous casting that compensates for the destructive effect of hot metal circulation patterns within the continuous casting mold.
In order to achieve the above and other objects of the invention, an improved mold assembly for a continuous casting machine includes a mold liner assembly having an inner surface defining a casting space in which molten metal is shaped and cooled; an immersion nozzle, terminating within the casting space, for introducing molten metal into the casting space; and selective cooling structure for selectively cooling the mold finer assembly in such a manner that cooling is directed in varying intensities to different portions of the inner surface of the mold liner assembly according to predetermined circulation patterns in the molten metal, whereby heat transfer inequality as a result of convection is accommodated over the inner surface of !he mold liner assembly.
According to a second aspect of the invention, a method of operating a continuous casting machine of the type having a mold liner assembly that has an inner surface defining a casting space in which molten metal may be shaped and cooled, includes steps of: (a) introducing molten metal into the casting space;
and (b) selectively cooling the mold liner assembly in varying intensities at different portions of the inner surface of the mold liner assembly according to predetermined circulation patterns in the molten metal, whereby heat transfer inequality as a result of convection is accommodated over the inner surface of the mold liner assembly, product quality is enhanced and mold life is lengthened.
These and various other advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages. and the objects obtained by its use, reference should be made to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a preferred embodiment of the invention.
FIGURE 1 is a diagrammatical view of a continuous casting machine that is constructed according to a preferred embodiment of the assembly 30 in the transition region I I I in order to accommodate the increased heat transfer that has been planned to occur at that region as a result of the circulation patterns 26 within the casting space 14. In this embodiment of the invention, the distance Tb - Tm is increased. A second aspect of this embodiment of the invention is that decreased cooling is intentionally directed to the relatively wide central region i and the outermost slots in region II, and this is done by decreasing the distance '-b - Tm.
Another aspect of the invention can, in order to direct cooling at the areas of the mold finer that need it the most, be employed together or in lieu of the variable thickness residual Tb - Tm discussed above. As is illustrated in FIGURE 2, the deepened slot portion 40 that is machined to be deeper than the base slot portion 38 extends for a vertical distance Lm. The second aspect of the invention involves varying the length Lm of the individual slots so that the length is greater in those slots where an enhanced cooling effect is desired, which again in the preferred embodiment is mainly in the transition region III. FIGURE 4 schematically depicts the length profile of the deepened slot portions 40 of the slots.
A preferred example of the construction described above is depicted in FIGURE 2, wherein the cooling slots are numbered, beginning from the center of region I and ending at ',he distal end of region II, as slots 1 through 19.
The chart below provides exemplary values of Tm, Tb - Tm and Lm for each of slots through 19.
SLOT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1f Tm~"", 25 24 23 22 22 21 21 20 20 20 20 20 21 22 22 23 24 25 2:
25Tb Tm 0 1 2 3 3 4 4 5 5 5 5 5 4 3 3 2 1 0 0 ~",(mm)8 8 8 8 10 12 14 16 18 20 20 18 16 14 12 10 8 8 8 Alternatively, the length of the slots could be varied without varying .
the slot depths, or the slot depths could be varied without varying the length of the slots. In addition, the principles of this invention could be applied to other types of continuous casting machines than that shown in the attached drawings.
It is to be understood, however, that even though numerous PCTlItS ~~/05514 ~EAIUS 0 9 FF9 1999 invention;
FIGURE 2 is a fragmentary cross-sectional view taken through one component of a mold assembly that is constructed according to the invention;
and FIGURE 3 is a second fragmentary cross-sectional view taken through another component of the system that is depicted in FIGURES 1 and 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS) Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views, and referring in particular to FIGURE 1, a continuous casting machine 10 that is constructed according to a preferred embodiment of the invention includes a mold assembly 12 that defines a casting space 14 in which molten metal may be shaped and cooled.
Continuous casting machine further includes a tundish 16 in which a supply of molten metal 18 is stored, and an immersion nozzle 20 for introducing the molten metal 18 from the tundish 16 into the casting space 14 that is defined by the mold assembly 12. A slide gate 22, as is conventional, is positioned above the immersion nozzle 20 for controlling the flow of molten metal 18 therethrough.
A distal end of immersion nozzle 20 has a number of outlets 24, through which the molten metal 18 is introduced into the casting space 14. As a result of the shape of the mold assembly 12 and the introduction of the molten metal 18 into the casting space 14, circulation patterns 26 are formed in the molten metal that is within the casting space 14, as is graphically depicted in FIGURE 1. As is described above, the effects of the circulation patterns 26 contribute to premature mold deterioration and failure, particularly in the meniscus region 28 of the mold assembly 12.
Referring now to FIGURES 2 and 3, it will be seen that the mold 12 includes a mold liner assembly 30 that includes an inner surface 32 that defines the casting space 14. According to one important aspect of the invention, the mold liner assembly 30 incorporates a selective cooling arrangement 34 for selectively cooling the mold liner assembly 30 in such a manner that cooling is directed in varying intensities to different portions of the inner surface 32 of the mold liner assembly 30 according to the predetermined circulation patterns 26 AMENOEfl SHEEt (shown in FIG. 1) in the molten metal, so that heat transfer inequality as a result of convection is accommodated over the inner surface of the mold liner assembly.
As is conventional, the mold liner assembly 30 has a number of cooling slots defined in the mold liner for conducting heat away from the inner surface 32 of the mold liner assembly 30. As may be seen in FIGURE 3, the cooling slots 36 according to this embodiment of the invention include a base slot portion 38 that is relatively parallel to the inner surface 32 of the mold liner assembly 30 and is machined to a depth that defines a mold wall thickness Tb that is equal to the distance between the bottom of the base slot portion 38 and the inner surface 32.
In the meniscus region 28, as may also be best seen in FIGURE 3, the cooling slot 36 includes a deepened slot portion 40 that is machined to be deeper than the base slot portion 38, and defines a minimum thickness Tm between the bottom of slot portion 40 and the inner wall 32 of the mold liner assembly 30. The deepened slot portion 40 communicates with a plenum 42 for conducting water away from the slot 36 during operation, as is well known in this area of technology.
Since the th ickness Tm at the deepened slot portion 40 is less than the thickness Tb at the base slot portion 38, an enhanced cooling effect is directed to the area of the mold proximate to the meniscus region 28, the extent of which may be measured by the difference in thickness between the two slot areas, or Tb-Tm, as is shown diagrammatically in FIGURE 3.
FIGURE 2 shows the bottom 44 of the slot portion 40 at the meniscus region 28, as well as the slot bottom 46 at the base slot portion 38.
As may be seen in FIGURE 2, which is a cross section taken horizontally across the mold wall as shown by lines 2-2 in FIGURE 3, this distance T~Tm is intentionally varied along the horizonal extent of the mold so as to selectively direct enhanced cooling to certain portions of the inner surface of the mold liner assembly, and, to direct a diminished cooling effect to other portions of the mold liner assembly. The mold liner assembly 30 depicted in FIGURE 2 is that of a conventionally shaped funnel mold. It includes a first relatively wide central region, which is identified by Roman numeral I, relatively narrow end regions (II), and transition regions (III) between the central regions I and the end regions II. In one embodiment of the invention, enhanced cooling is directed to the inner surface 32 of the mold liner .7.
characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (15)
1. An improved mold assembly for a continuous casting machine, comprising:
a funnel-type mold liner assembly having an inner surface defining a casting space in which molten metal is shaped and cooled, said mold liner comprising a relatively wide central region, relatively narrow end regions, and transition regions between said central region and said end regions;
an immersion nozzle, terminating within the casting space, for introducing molten metal into the casting space; and selective cooling means for selectively cooling said mold liner assembly in such a manner that cooling is directed in varying intensities to different portions of the inner surface of the mold liner assembly and so as to direct enhanced cooling to said transition regions, whereby heat transfer inequality as a result of convection may be accommodated over the inner surface of the mold liner assembly.
a funnel-type mold liner assembly having an inner surface defining a casting space in which molten metal is shaped and cooled, said mold liner comprising a relatively wide central region, relatively narrow end regions, and transition regions between said central region and said end regions;
an immersion nozzle, terminating within the casting space, for introducing molten metal into the casting space; and selective cooling means for selectively cooling said mold liner assembly in such a manner that cooling is directed in varying intensities to different portions of the inner surface of the mold liner assembly and so as to direct enhanced cooling to said transition regions, whereby heat transfer inequality as a result of convection may be accommodated over the inner surface of the mold liner assembly.
2. An improved mold assembly for a continuous casting machine, comprising:
a funnel-type mold liner assembly having an inner surface defining a casting space in which molten metal is shaped and cooled, said mold liner comprising a relatively wide central region, relatively narrow end regions, and transition regions between said central region and said end regions;
an immersion nozzle, terminating within the casting space, for introducing molten metal into the casting space; and selective cooling means for selectively cooling said mold liner assembly in such a manner that cooling is directed in varying intensities to different portions of the inner surface of the mold liner assembly, and wherein said selective cooling means is constructed and arranged to direct diminished cooling to said central region.
a funnel-type mold liner assembly having an inner surface defining a casting space in which molten metal is shaped and cooled, said mold liner comprising a relatively wide central region, relatively narrow end regions, and transition regions between said central region and said end regions;
an immersion nozzle, terminating within the casting space, for introducing molten metal into the casting space; and selective cooling means for selectively cooling said mold liner assembly in such a manner that cooling is directed in varying intensities to different portions of the inner surface of the mold liner assembly, and wherein said selective cooling means is constructed and arranged to direct diminished cooling to said central region.
3. An assembly according to claim 1, wherein said selective cooling means is further constructed and arranged to provide enhanced cooling to a meniscus portion of said inner surface of said mold liner assembly.
4. An assembly according to claim 1, wherein said selective cooling means is constructed and arranged to direct cooling at varying intensities by accordingly varying distances between the inner surface of the mold liner assembly and the bottoms of cooling slots that are defined in the mold liner assembly.
5. An assembly according to claim 4, wherein said selective cooling means is further constructed and arranged to direct cooling at varying intensities by accordingly varying the length of deepened slot portions according to the amount of cooling that is desired at a particular area in the moldface.
6. An assembly according to claim 1, wherein said selective cooling means is constructed and arranged to direct cooling at varying intensities by accordingly varying the length of deepened slot portions according to the amount of cooling that is desired at a particular area in the moldface.
7. A method of operating a continuous casting machine of the type having a funnel-type mold liner assembly that has an inner surface defining a casting space in which molten metal may be shaped and cooled the inner surface defining a relatively wide central region, relatively narrow end regions, and transition regions between said central region and said end regions, comprising steps of:
(a) introducing molten metal into the casting space; and (b) selectively cooling the mold liner assembly in varying intensities at different portions of the inner surface of the mold liner assembly by directing enhanced cooling to said transition, whereby heat transfer inequality as a result of convection may be accommodated over the inner surface of the mold liner assembly, product quality is enhanced and mold life is lengthened.
(a) introducing molten metal into the casting space; and (b) selectively cooling the mold liner assembly in varying intensities at different portions of the inner surface of the mold liner assembly by directing enhanced cooling to said transition, whereby heat transfer inequality as a result of convection may be accommodated over the inner surface of the mold liner assembly, product quality is enhanced and mold life is lengthened.
8. A method of operating a continuous casting machine of the type having a funnel-type mold liner assembly that has an inner surface defining a casting space in which molten metal may be shaped and cooled the inner surface defining a relatively wide central region, relatively narrow end regions, and transition regions between said central region and said end regions, comprising steps of:
(a) introducing molten metal into the casting space; and (b) selectively cooling the mold liner assembly in varying intensities at different portions of the inner surface of the mold liner assembly by directing diminished cooling to said central region, whereby heat transfer inequality as a result of convection may be accommodated over the inner surface of the mold liner assembly, product quality is enhanced and mold life is lengthened.
(a) introducing molten metal into the casting space; and (b) selectively cooling the mold liner assembly in varying intensities at different portions of the inner surface of the mold liner assembly by directing diminished cooling to said central region, whereby heat transfer inequality as a result of convection may be accommodated over the inner surface of the mold liner assembly, product quality is enhanced and mold life is lengthened.
9. A method according to claim 7, further comprising providing enhanced cooling to a portion of the inner surface of the mold liner assembly that corresponds to where the meniscus of the molten metal will be positioned during casting.
10. A method according to claim 7, wherein step (b) is performed by varying distances between the inner surface of the mold liner assembly and the bottoms of cooling slots that are defined in the mold liner assembly.
11. A method according to claim 10, wherein step (b) is further performed by varying the length of a deepened cooling slot according to the amount of additional cooling that is desired to be directed to an area of the mold liner assembly.
12. A method according to claim 7, wherein step (b) is performed by varying the length of a deepened cooling slot according to the amount of additional cooling that is desired to be directed to an area of the mold liner assembly.
13. A method according to claim 7, further comprising a step of, before step (b), predicting circulation patterns in the molten metal, and wherein step (b) is performed so as to selectively cool the mold liner assembly in varying intensities at different portions of the inner surface of the mold liner assembly according to said predicted circulation patterns in the molten metal.
14. An assembly according to claim 2, wherein said selective cooling means is constructed and arranged to direct cooling at varying intensities by accordingly varying the length of deepened slot portions according to the amount of cooling that is desired at a particular area in the moldface.
15. A method according to claim 8, wherein step (b) is performed by varying the length of a deepened cooling slot according to the amount of additional cooling that is desired to be directed to an area of the mold liner assembly.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/822,559 US5927378A (en) | 1997-03-19 | 1997-03-19 | Continuous casting mold and method |
| US08/822,559 | 1997-03-19 | ||
| PCT/US1998/005514 WO1998041342A1 (en) | 1997-03-19 | 1998-03-19 | Improved continuous casting mold and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2284190A1 true CA2284190A1 (en) | 1998-09-24 |
Family
ID=25236369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002284190A Abandoned CA2284190A1 (en) | 1997-03-19 | 1998-03-19 | Improved continuous casting mold and method |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5927378A (en) |
| JP (1) | JP4109321B2 (en) |
| CN (1) | CN1072061C (en) |
| AT (1) | AT412194B (en) |
| AU (1) | AU6573798A (en) |
| BR (1) | BR9808394A (en) |
| CA (1) | CA2284190A1 (en) |
| DE (1) | DE19882215T1 (en) |
| GB (1) | GB2337715B (en) |
| WO (1) | WO1998041342A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19742795A1 (en) * | 1997-09-27 | 1999-04-01 | Schloemann Siemag Ag | Funnel geometry of a mold for the continuous casting of metal |
| DE19802809A1 (en) * | 1998-01-27 | 1999-07-29 | Km Europa Metal Ag | Liquid-cooled mold |
| DE19903929A1 (en) * | 1999-02-01 | 2000-08-03 | Sms Demag Ag | Mold plate of a mold with funnel-shaped pouring area for the continuous casting of metal |
| DE10148150B4 (en) * | 2001-09-28 | 2014-05-22 | Egon Evertz Kg (Gmbh & Co.) | Liquid-cooled continuous casting mold |
| DE10226214A1 (en) * | 2002-06-13 | 2003-12-24 | Sms Demag Ag | Continuous casting mold for liquid metals, especially for liquid steel |
| AT412454B (en) * | 2003-01-20 | 2005-03-25 | Voest Alpine Ind Anlagen | METHOD AND DEVICE FOR TEMPERATURE MANAGEMENT OF A MELT IN A COOLED CONTINUOUS GASKILKILLE |
| DE10304543B3 (en) * | 2003-02-04 | 2004-05-27 | Sms Demag Ag | Continuous casting of liquid metals, especially liquid steel, comprises partially reducing the heat transfer number during cooling in the region of the heat flow shadow of the submerged nozzle |
| CN1292858C (en) * | 2004-01-17 | 2007-01-03 | 宝山钢铁股份有限公司 | Water-cooled metal continuous-casting crystallizer |
| US7392970B2 (en) * | 2004-05-25 | 2008-07-01 | Douglas J Bachan | Cooling injection mold |
| DE102006060673A1 (en) * | 2006-11-02 | 2008-05-08 | Sms Demag Ag | Method and control device for controlling the heat dissipation of a side plate of a mold |
| US7886807B2 (en) * | 2007-06-15 | 2011-02-15 | Die Therm Engineering L.L.C. | Die casting control method |
| CN103182496B (en) * | 2011-12-31 | 2017-06-13 | Posco公司 | Bleedout detection means in continuous casting process |
| DE102022208478A1 (en) * | 2022-08-16 | 2024-02-22 | Sms Group Gmbh | Copper plate with local intensive cooling zones |
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| US2169893A (en) * | 1937-11-01 | 1939-08-15 | Chase Brass & Copper Co | Cooling means for continuous casting apparatus |
| US2893080A (en) * | 1954-03-26 | 1959-07-07 | Norman P Goss | Apparatus for the continuous casting of metals |
| US2862265A (en) * | 1956-12-10 | 1958-12-02 | Aluminum Co Of America | Continuous casting mold |
| CH424102A (en) * | 1965-05-03 | 1966-11-15 | Wertli Alfred | Method for continuously casting a strip and cooling device for carrying out the method |
| US3528487A (en) * | 1967-06-05 | 1970-09-15 | Interlake Steel Corp | Continuous casting machine |
| SU248912A1 (en) * | 1968-05-12 | 1986-08-23 | Simonov V P | Mould for continuous casting of metals and alloys |
| US3763920A (en) * | 1972-03-16 | 1973-10-09 | United States Steel Corp | Water inlet construction for continuous-casting molds |
| JPS518124A (en) * | 1974-07-10 | 1976-01-22 | Kobe Steel Ltd | RENZOKUCHUZO YOIGATA |
| US3978910A (en) * | 1975-07-07 | 1976-09-07 | Gladwin Floyd R | Mold plate cooling system |
| JPS5854175B2 (en) * | 1976-11-26 | 1983-12-03 | 第一高周波工業株式会社 | Local solution treatment method for rust-free steel pipes |
| US4182397A (en) * | 1978-07-03 | 1980-01-08 | Allis-Chalmers Corporation | Continuous casting mold and means for securing mold liners therein |
| CS208541B1 (en) * | 1978-09-22 | 1981-09-15 | Ferdinand Lenorak | Winding unit in the multitwist spindle |
| SU952422A1 (en) * | 1980-12-22 | 1982-08-23 | Могилевское Отделение Физико-Технического Института Ан Бсср | Continuous casting mould |
| US4535832A (en) * | 1981-04-29 | 1985-08-20 | Gus Sevastakis | Continuous casting apparatus |
| JPS58151425A (en) * | 1982-02-27 | 1983-09-08 | Nippon Kokan Kk <Nkk> | Manufacture of high corrosion-resistant clad steel pipe superior in low-temperature toughness |
| JPS59133940A (en) * | 1983-01-21 | 1984-08-01 | Mishima Kosan Co Ltd | Mold for continuous casting |
| JPS60250856A (en) * | 1984-05-28 | 1985-12-11 | Sumitomo Metal Ind Ltd | Mold for continuous casting |
| JPS61195746A (en) * | 1985-02-25 | 1986-08-30 | Sumitomo Metal Ind Ltd | Mold for continuous casting |
| JPS61235516A (en) * | 1985-04-12 | 1986-10-20 | Ishikawajima Harima Heavy Ind Co Ltd | Heat treatment of welded stainless steel joint |
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| JPS6347337A (en) * | 1986-08-15 | 1988-02-29 | Nippon Steel Corp | Manufacture of roll for continuous casting |
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| JPH0335850A (en) * | 1989-06-30 | 1991-02-15 | Sumitomo Metal Ind Ltd | Mold for continuous casting |
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| US5467810A (en) * | 1994-04-01 | 1995-11-21 | Acutus Industries | Continuous metal casting mold |
-
1997
- 1997-03-19 US US08/822,559 patent/US5927378A/en not_active Expired - Fee Related
-
1998
- 1998-03-19 BR BR9808394-5A patent/BR9808394A/en not_active IP Right Cessation
- 1998-03-19 AT AT0904098A patent/AT412194B/en not_active IP Right Cessation
- 1998-03-19 CA CA002284190A patent/CA2284190A1/en not_active Abandoned
- 1998-03-19 JP JP54083698A patent/JP4109321B2/en not_active Expired - Fee Related
- 1998-03-19 GB GB9922094A patent/GB2337715B/en not_active Expired - Fee Related
- 1998-03-19 AU AU65737/98A patent/AU6573798A/en not_active Abandoned
- 1998-03-19 CN CN98803497A patent/CN1072061C/en not_active Expired - Fee Related
- 1998-03-19 DE DE19882215T patent/DE19882215T1/en not_active Withdrawn
- 1998-03-19 WO PCT/US1998/005514 patent/WO1998041342A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| GB2337715A (en) | 1999-12-01 |
| CN1251062A (en) | 2000-04-19 |
| US5927378A (en) | 1999-07-27 |
| AT412194B (en) | 2004-11-25 |
| JP4109321B2 (en) | 2008-07-02 |
| BR9808394A (en) | 2001-08-28 |
| CN1072061C (en) | 2001-10-03 |
| AU6573798A (en) | 1998-10-12 |
| WO1998041342A1 (en) | 1998-09-24 |
| GB9922094D0 (en) | 1999-11-17 |
| JP2001516284A (en) | 2001-09-25 |
| DE19882215T1 (en) | 2000-05-25 |
| ATA904098A (en) | 2004-04-15 |
| GB2337715B (en) | 2002-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |