KR101172329B1 - Mold plate, Mold plate assembly, and mold for casting - Google Patents

Abstract

Provided are a mold plate, a mold plate assembly, and a mold for casting. The mold plate includes a first face having a recess on top and a second face opposite to the first face. At least one first cooling channel extends from the central portion of the second surface to intersect the casting direction of the melt. At least one second cooling channel extends in a direction opposite to the at least one first cooling slot so as to intersect the casting direction of the molten metal from the central portion of the second surface. The thickness from the bottom surface of the one ends of the at least one first and second cooling channels adjacent to the central portion of the second surface to the first surface is equal to the at least one first and adjacent surfaces of the second surface. It is smaller than the thickness from the bottom surface of the other ends of the second cooling channels to the first surface.

Description

Mold plate, Mold plate assembly, and mold for casting

The present invention relates to a metal casting apparatus, and more particularly, to a mold structure used for casting molten metal and a casting apparatus using the same.

A casting process, such as a continuous casting process, refers to a process in which molten metal is cooled through a mold to produce continuously cast steel. The initial solidification process of the molten metal flowing into the mold is one of the factors that determine the properties of the cast slab is completed. If the cooling conditions in the mold during initial solidification are not adequately controlled, the cast may be distorted or even cracks may occur. In particular, the corner portion of the mold is structurally faster than the cooling rate, and thus there is a fear that the initial solidification of the cast steel is uneven and the cast steel is broken.

Accordingly, a problem to be solved by the present invention is to provide a mold structure capable of controlling cooling conditions more uniformly in response to the solidification state of molten metal. The foregoing problem has been presented by way of example, and the scope of the present invention is not limited by this problem.

A casting mold plate according to an aspect of the present invention includes a first surface including a concave portion on an upper surface thereof and a second surface opposite the first surface. At least one first cooling channel extends from the central portion of the second surface to intersect the casting direction of the melt. At least one second cooling channel extends in a direction opposite to an extending direction of the at least one first cooling channel so as to intersect a casting direction of the molten metal from a central portion of the second surface. The thickness from the bottom surface of the one ends of the at least one first and second cooling channels adjacent to the central portion of the second surface to the first surface is equal to the at least one first and adjacent surfaces of the second surface. It is smaller than the thickness from the bottom surface of the other ends of the second cooling channels to the first surface.

According to one aspect of the mold plate, the thickness from the bottom surface of the at least one first and second cooling channels to the first surface may become larger from the central portion of the second surface to both ends.

According to another aspect of the mold plate, the at least one first cooling channel includes at least one first cooling slot formed recessed in the first surface direction from the second surface, and the at least one second cooling The channel may include at least one second cooling slot recessed in the direction of the first surface from the second surface and disposed in parallel with the at least one first cooling slot.

According to yet another aspect of the mold plate, at least one inlet portion through which the cooling medium flows into the central portion of the second surface and at least one pair of outlet portions through which the cooling medium is discharged to both ends of the second surface. A lid member may be further provided to be spaced apart from the bottom surface of the at least one first and second cooling slots. Furthermore, the distance from the inner wall of the cover member inside the at least one first and second cooling slots to the bottom surface of the at least one first and second cooling slots may be constant.

According to one aspect of the present invention, there is provided a mold plate assembly for casting comprising a first mold plate and a second mold plate. The first mold plate is in contact with the molten metal and includes at least one first surface including a concave portion, a second surface opposite to the first surface, and at least one extending from the central portion of the second surface to cross the casting direction of the molten metal. And a first cooling slot, and at least one second cooling slot extended in a direction opposite to an extending direction of the at least one first cooling slot so as to intersect the casting direction of the molten metal. The second mold plate includes a third face coupled to the second face of the first mold plate, and a fourth face opposite to the third face. The thickness from the bottom surface of the one ends of the at least one first and second cooling slots adjacent to the central portion of the second surface to the first surface is equal to the at least one first and second surfaces adjacent to both ends of the second surface. Less than the thickness from the bottom surface of the other ends of the second cooling slots to the first surface.

According to one aspect of the mold plate, the second mold plate comprises: at least one cooling medium inlet connected to one ends of the at least one first and second cooling slots adjacent to a central portion of the second surface; And at least one pair of outlets connected to the other ends of the at least one first and second cooling slots adjacent to both ends of the second surface.

According to another aspect of the mold plate, the second mold plate is recessed in the direction from the third side to the fourth side and extends across the at least one first and second cooling slots and the at least one inlet And at least one third cooling slot commonly connected to the at least one first and second cooling slots.

According to another aspect of the mold plate, the second mold plate is recessed in the direction of the fourth surface from the third side and extends across the at least one first and second cooling slots and the at least one pair It may further include at least one fourth cooling slot commonly connected to the outlets of the and the at least one first and second cooling slots.

The casting mold of one embodiment of the present invention includes a plurality of mold plate assemblies joined to define a slab shape. At least one of the plurality of mold plate assemblies includes any one of the casting mold plates or any one of the casting mold plate assemblies.

According to the mold structure according to the embodiments of the present invention, it is possible to suppress the concentration of cooling in the corner portion of the cast when casting molten metal. Therefore, the cooling uniformity of the cast can be improved to suppress cracking or cracking of the cast, thereby improving the quality of the cast.

1 is a perspective view showing a mold plate according to an embodiment of the present invention;
FIG. 2A is a cross-sectional view taken along line II-II 'of the mold plate of FIG. 1;
FIG. 2B is a cross-sectional view taken along line III-III 'of the mold plate of FIG. 1;
3 (a) is a cross-sectional view showing a mold plate according to another embodiment of the present invention;
FIG. 3B is a longitudinal sectional view of the mold plate of FIG. 3A;
4 is a perspective view showing a mold plate assembly according to one embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along the line VV ′ of the mold plate assembly of FIG. 4; FIG.
6 is an exploded perspective view of the mold plate assembly of FIG. 4;
7 is a perspective view showing a second mold plate of the assembly of the mold plate of FIG. 4;
8 is a sectional view showing a mold plate assembly according to another embodiment of the present invention;
9 is a perspective view showing a mold according to an embodiment of the present invention;
10 is a schematic plan view showing the mold of FIG. 9;
11 is a schematic view showing a casting apparatus according to an embodiment of the present invention;
12 is a schematic view showing a mold plate according to a comparative example for temperature simulation;
13 is a schematic view showing a mold plate according to an experimental example for temperature simulation;
14 is a schematic view showing color simulation results of a temperature simulation result for a mold plate according to a comparative example;
15 is a schematic view showing color simulation results of a temperature simulation result for a mold plate according to an experimental example; And
16 is a graph showing a simulation temperature distribution in one cross section of mold plates according to Comparative Examples and Experimental Examples.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. In the drawings, the components may be exaggerated or reduced in size for convenience of description.

In the embodiments of the present invention, the x-axis, the y-axis, and the z-axis are not limited to three axes on the Cartesian coordinate system, and may be interpreted in a broad sense including the same. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may refer to different directions that are not orthogonal to each other.

In the embodiments of the present invention, the center portion and the end portion can be interpreted in a relative meaning within the range conventionally recognized in the art. That is, the central portion may be interpreted in a broad sense including not only the center of the subject but also an adjacent portion thereof, and the end portion may be interpreted in a broad sense including the adjacent portion as well as the extreme end. For example, in FIG. 1, an end portion of the mold plate 110 may refer to the outermost portion and the edge of the mold plate 110 in the + direction or the − direction of the y axis.

In embodiments of the present invention, a cooling slot may refer to a portion of a cooling channel recessed or formed by a predetermined depth from one surface of an object. The bottom face of the cooling slot may refer to the bottom in the depth direction, ie the end face in the recessed or recessed direction.

1 is a perspective view showing a mold plate 110 according to an embodiment of the present invention. FIG. 2A is a cross-sectional view taken along line II-II 'of the mold plate 110 of FIG. 1, and FIG. 2B is taken along line III-III' of the mold plate 110 of FIG. 1. One cross section.

1 and 2, the mold plate 110 may include a first surface 111 and a second surface 112. For example, mold plate 110 may constitute a portion of a mold for a casting device for forming a solid cast from a melt. The casting apparatus may include a continuous casting apparatus for continuously forming cast pieces from the melt. For example, the melt may be moved in the ± z axis direction, in which case the casting direction may be in the ± z axis direction. For example, the first surface 111 may be a surface in contact with the molten metal, and the second surface 112 may be an opposite surface.

The first surface 111 may include a recess 113 in a central portion thereof. The concave portion 113 may refer to a portion recessed concave in the direction of the second surface 112, that is, the x-axis direction. The sigmoid cross-sectional shape of the recess 113 is illustrated by way of example and may be modified in various shapes. For example, the cross section of the concave portion 113 may have an elliptical shape, a circular shape, a polygonal shape, or the like, and may further include at least one inflection portion.

The recess 113 may serve to widen the width of the injection portion of the molten metal for casting. This shape can be useful for reducing casting time by widening the injection portion of the melt when forming a thin cast. For example, the recess 113 may be formed by a predetermined depth along the casting direction from the top of the first surface 111. Accordingly, the depth of the recess 113 in the x-axis direction may become shallower along the casting direction, for example, the -z direction.

On the other hand, since the concave portion 113 does not define the shape of the cast steel, the lower portion of the first surface 111, that is, the portion below the concave portion 113, may have a proper shape to define the cast steel shape. For example, when the slab has a slab shape, the flat portion 114 may be disposed below the concave portion 113 to define the shape of one surface of the slab. Further, the flat surface portion 114 can be extended on both sides of the concave portion 113 at the top of the first surface 111 so as to surround the concave portion 113.

At least one first cooling slot 115a may extend to intersect with the casting direction (± z axis direction). The at least one second cooling slot 115b may extend in a direction opposite to the stretching direction of the first cooling slot 115a to cross the casting direction (± z axis direction). For example, the first cooling slots 115a and the second cooling slots 115b may extend from the center portion of the second surface 112 in both end directions (± y-axis direction), respectively. The extending direction (± y axis direction) and the casting direction (± z axis direction) of the first cooling slots 115a and the second cooling slots 115b may be perpendicular to each other.

The first cooling slots 115a and the second cooling slots 115b may be part or all of the cooling medium, eg, the first cooling channels 128a and the second cooling channels 128b through which the cooling water flows. It can be used to initially or primary cool the melt on the first side 111. In this embodiment, the first cooling channels 128a and the second cooling channels 128b may be substantially the same as the first cooling slots 115a and the second cooling slots 115b. The mold plate 110 may be made of a material having high thermal conductivity, such as copper or copper alloy.

The number of first cooling slots 115a and second cooling slots 115b is shown by way of example and does not limit the scope of this embodiment. For example, the plurality of first cooling slots 115a are arranged in parallel along the casting direction (± z axis direction) of the cast steel, and the plurality of second cooling slots 115b are also spaced apart from each other in the column. It can be arranged in parallel along the casting direction (± z axis direction). The first cooling slots 115a and the second cooling slots 115b are equal in number to each other for uniformity of cooling, and arranged in a symmetrical structure with respect to the casting line or the casting direction (± z axis line). Can be. However, in a modified example of this embodiment, the number and arrangement of the first cooling slots 115a and the second cooling slots 115b may be asymmetrically modified to adjust the cooling distribution. As shown in FIG. 2B, the distance from the bottom surface of the first cooling slots 115a and the second cooling slots 115b to the first surface 111 may be constant.

The first cooling slots 115a and the second cooling slots 115b may be formed to be recessed in the direction of the first surface 111 (−x-axis direction) from the second surface 112. As shown in FIG. 2, the cooling medium flows from the central portion of the second surface 112 and follows the first cooling slots 115a and the second cooling slots 115b, that is, across the casting direction of the melt. And then flows out at both ends of the second face 112. Accordingly, since the temperature of the cooling medium may be warmed up from the centers of the first cooling slots 115a and the second cooling slots 115b to both ends, the flow of the cooling medium may be increased from the mold plate 110. It is possible to make the temperature of the cooling medium higher at both ends than at the center of c).

For example, the thickness T _c from the bottom surface of one ends of the first cooling slots 115a and the second cooling slots 115b adjacent to the center portion of the second surface 112 to the first surface 111. ) Is greater than zero and the thickness (from the bottom surface of the other ends of the first cooling slots 115a and the second cooling slots 115b adjacent to both ends of the second surface 112 to the first surface 111). T _e ). Furthermore, the thickness from the bottom surface of the first cooling slots 115a and the second cooling slots 115b to the first surface 111 may gradually increase from the center portion of the second surface 112 to both ends thereof. . Furthermore, the thickness distribution from the bottom surface of the first cooling slots 115 to the first surface 111 may be symmetrical with respect to the casting line of the molten metal.

This structure can be achieved by adjusting the depth of the first cooling slots 115 and / or the depth of the recess 113. For example, if the depth of the recess 113 is greatest at the center of the first face 111, the depth of the first cooling slots 115 is constant or at both ends at the center of the second face 112. Can be increased or decreased gradually or stepwise. Furthermore, the depth distribution of the first cooling slots 115 may be symmetric with respect to the center of the casting line or the second surface 112 of the melt for cooling symmetry.

This structure of the first cooling slots 115a and the second cooling slots 115b can change the cooling distribution of the mold plate 110. That is, the distance between the cooling medium and the molten metal is greater than the cooling rate at both ends because the distance (T _c ) at the center portion of the mold plate 110 is smaller than the distance (T _e ) at both ends. Therefore, according to this structure, the cooling rate at the end of the mold plate 110 can be adjusted lower than the cooling rate at the central portion thereof.

This change in cooling distribution can be described in more detail with reference to the simulation results below.

12 is a schematic view showing a mold plate according to a comparative example for temperature simulation. 13 is a schematic view showing a mold plate according to an experimental example for temperature simulation.

12 and 13, mold plates according to Comparative Examples and Experimental Examples show a half model extending from the center portion to the one end portion of the actual model. In this case, the other half model can be understood to have a symmetric model with respect to the half model and the center part. Although not clearly shown in FIG. 13, the above-described recess is formed on the upper left side of the rear portion of FIG. 13.

As shown in FIG. 12, the mold plate according to the comparative example extends parallel to the casting direction (in the ± z-axis direction of FIG. 1) and includes first cooling slots having a constant depth regardless of the position. As shown in FIG. 13, the mold plate according to the experimental example includes first cooling slots extending perpendicular to the casting direction (in the ± y-axis direction of FIG. 1) and decreasing in depth from the center portion to the end portion. The mold plate according to the experimental example may correspond to the mold plate 110 of FIG. 1.

In this simulation, the mold plates according to Comparative Examples and Experimental Examples were made of the same copper alloy, and their thermal conductivity was about 320 W / mK, and the first cooling slot had the same cooling water of about 30 ° C. as the cooling medium. Assume that it is supplied to the center part. It is assumed that the molten metal is supplied at about 1500 ° C during the casting process.

14 is a schematic diagram showing a color simulation result of a temperature simulation on a mold plate according to a comparative example. 15 is a schematic diagram showing a color simulation result of a temperature simulation on a mold plate according to an experimental example. 16 is a graph showing a simulation temperature distribution in one cross section of mold plates according to Comparative Examples and Experimental Examples. 14 and 15, the color distribution of the temperature indicates that the temperature is higher toward the red direction in the bar color distribution, and the temperature is lower toward the blue direction. The temperature distribution in FIG. 16 shows the temperature distribution seen in the cross-section parallel to the casting direction of the initial portion where the molten metal starts to solidify, that is, the upper red portion of FIGS. 14 and 15.

14 and 15, it can be seen that as the hot melt is supplied from the top to the bottom of the mold plate, the temperature of the mold plates is generally lowered from the top to the bottom.

Referring to FIG. 16, in the case of the mold plate according to the comparative example, it can be seen that the temperature difference between the center portion C and the end portion E is not large, but the temperature fluctuates like a wave as it passes across the first cooling slots. have. On the other hand, in the case of the mold plate according to the experimental example it can be seen that the temperature rises from the central portion (C) toward the end (E).

This temperature distribution shows that in the mold plate according to the experimental example, the cooling rate at the center thereof is greater than the cooling rate at the end thereof. On the other hand, the temperature distribution for the other half model can be understood to be symmetrical with respect to the center part. Therefore, as described above, the cooling rate at both ends of the mold plate can be adjusted to be lower than the cooling rate at the center thereof. This cooling rate distribution of the mold plate of a single structure can contribute to the uniformity of the cooling rate distribution in the mold structure as described below.

3 (a) and 3 (b) show a cross section and a longitudinal section of a mold plate 110 ′ according to another embodiment of the present invention, respectively. The mold plate 110 ′ according to this embodiment further adds some components to the mold plate 110 of FIGS. 1 and 2, and thus duplicated description is omitted in the two embodiments.

Referring to FIG. 3, the first cooling slot 115a includes at least one first inlet 116a and at least one first outlet 117a, and the second cooling slot 115b is at least one. It may include a second inlet 116b and at least one second outlet 117b. For example, the first inlets 116a and the second inlets 116b may have one end of the first cooling slots 115a and the second cooling slots 115b adjacent to the central portion of the second face 112. The first outlets 117a and the second outlets 117b are disposed in the portions, and the first outlet slots 117b and the second outlet slots 117b are adjacent to both ends of the second face 112. It may be disposed at the other ends. The cooling medium, such as cooling water, may be supplied to the first inlets 116a and the second inlets 116b and discharged to the first outlets 117a and the second outlets 117b.

The lid member 118 is provided with first cooling slots 115a and first between the first inlet 116a and the first outlet 117a and between the second inlet 116b and the second outlet 117b. 2 may be spaced apart from the bottom surface of the cooling slots (115b). As a result, the first cooling channel 128a is defined between the lid member 118 and the bottom surface of the first cooling slot 115a, and between the lid member 118 and the bottom surface of the second cooling slot 115b. The second cooling channel 128b may be defined.

The thickness from the second face 112 of the lid member 118 toward the first face 111 may be adjusted to adjust the width of the first cooling channels 128a and the second cooling channels 128b. . For example, the thickness of the cover member 118 is closer to the first outlets 117a and the second outlets 117b than one side adjacent to the first inlets 116a and the second inlets 116b. Can be smaller.

Furthermore, the cover member 118 inside the first cooling channels 128a and the second cooling channels 128b in order to make the widths of the first cooling channels 128a and the second cooling channels 128b constant. The inner wall of the) may maintain a constant distance from the bottom surface of the first cooling slots (115a) and the second cooling slots (115b). For example, the outer wall opposite the inner wall of the lid member 118 is aligned with the second face 112 and the thickness of the lid member 118 is at the first inlets 116a and the second inlets 116b. It may become smaller or larger toward the first outlets 117a and the second outlets 117b.

The coolant flows into the first inlets 116a and the second inlets 116b and then flows along the first cooling channels 128a and the second cooling channels 128b and the first outlets 117a and the first outlets 116a and 116b. 2 may be discharged through the outlets 117b. As described above, the flow of the cooling medium may make the temperature of the cooling medium higher at both ends than the center of the mold plate 110 ′.

4 is a perspective view illustrating a mold plate assembly 130 according to an embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line V′-V ′ of the mold plate assembly 130 of FIG. 4. 6 is an exploded perspective view of the mold plate assembly 130 of FIG. 4. FIG. 7 is a perspective view illustrating the second mold plate 120 of the assembly 130 of the mold plate of FIG. 4.

4 and 5, the mold plate assembly 130 may include a first mold plate 110 and a second mold plate 120. The first mold plate 110 may refer to the mold plate 110 of FIGS. 1 and 2. The second mold plate 120 may be coupled to the first mold plate 110 to supply or discharge a cooling medium to the first mold plate 110.

In a modified example of this embodiment, the first mold plate 110 may be replaced with the mold plate 110 ′ of FIG. 3.

6 and 7, the second mold plate 120 may include a third surface 121 and a fourth surface 122. The third surface 121 may be coupled to face the second surface 112 of the first mold plate 110 and the fourth surface 122 may be disposed on the opposite side thereof. The second mold plate 120 may be coupled to cover the remaining portions except for portions of the first cooling slots 115a and the second cooling slots 115b.

The second mold plate 120 may be referred to as a water jacket in that it supplies a cooling medium to the first mold plate 110. The second mold plate 120 may be made of a material having high thermal conductivity, such as copper or copper alloy. The first mold plate 110 and the second mold plate 120 may be tightly coupled by suitable fastening means, such as a high tension bolt structure.

At least one inlet 123 and at least one pair of outlets 124a, 124b penetrate through the second mold plate 120 from the fourth side 122 to form the first cooling slots of the first mold plate 110 ( The second mold plate 120 may be provided to be connected to the 115a) and the second cooling slots 115b. For example, the inlet 123 is connected to one ends of the first cooling slots 115a and the second cooling slots 115b adjacent to the center portion of the second face 112 and the outlets 124a and 124b. May be connected to the first cooling slots 115a and the other ends of the second cooling slots 115b adjacent to both ends of the second surface 112.

For example, the inlet 123 may be disposed at the center of the second mold plate 120, and the outlets 124a and 124b may be disposed at both ends of the second mold plate 120. The number and arrangement of inlets 123 and outlets 124a and 124b are shown by way of example and may be modified as appropriate.

At least one third cooling slot 125 may be disposed in the second mold plate 120 to be connected to the inlet 123. The third cooling slot 125 may be commonly connected to one ends of the first cooling slots 115a and the second cooling slots 115b adjacent to the center portion of the first mold plate 110. For example, the third cooling slot 125 is recessed in the direction from the third face 121 to the fourth face 122 and is parallel to the casting direction of the molten metal and has the first cooling slots 115a and the second cooling slots. May extend to intersect with 115b (eg, in the ± z-axis direction). For example, the third cooling slot 125 may be disposed to be orthogonal to the first cooling slots 115a and the second cooling slots 115b.

The third cooling slot 125 may be disposed therebetween to commonly connect the inlets 123 and the ends of the first cooling slots 115a and the second cooling slots 115b. Accordingly, the cooling medium introduced into the inlet 123 may be branched in the third cooling slot 125 to be uniformly introduced into the first cooling slots 115a and the second cooling slots 115b. The number of third cooling slots 125 is shown by way of example and does not limit the scope of this embodiment. For example, the number of third cooling slots 125 may be adjusted according to the number of inlets 123.

The pair of fourth cooling slots 126a and 126b may be disposed in the second mold plate 120 to be connected to the outlets 124a and 124b, respectively. The fourth cooling slots 126a and 126b are common to portions adjacent to the other ends of the first cooling slots 115a and the second cooling slots 115b adjacent to both ends of the second face 112. Can be connected. For example, the fourth cooling slots 126a and 126b are recessed in the direction from the third surface 121 to the fourth surface 122 and parallel to the casting direction of the molten metal, and the first cooling slots 115a and the second cooling slots. It may extend to intersect with the cooling slots 115b (eg, in the ± z-axis direction). For example, the fourth cooling slots 126a and 126b may be disposed to be orthogonal to the first cooling slots 115a and the second cooling slots 115b.

One side of the fourth cooling slot 126a is disposed between the outlets 124a and the other ends of the first cooling slots 115a in common, and the other side of the fourth cooling slot 126b is the outlet 124b. ) And the other ends of the second cooling slots 115b may be disposed therebetween. Accordingly, the cooling medium from the first cooling slots 115a and the second cooling slots 115b may be collected in the fourth cooling slots 126a and 126b and discharged to the outlets 124a and 124b. . The number of fourth cooling slots 126a, 126b is shown by way of example and does not limit the scope of this embodiment. For example, the number of fourth cooling slots 126a and 126b may be adjusted according to the number of outlets 124a and 124b.

The first cooling channels 128a and the second cooling channels 128b may represent movement paths of the cooling medium. For example, the first cooling channel 128a may be connected to the outlet 124a from the inlet 123 via the third cooling slot 125, the first cooling slot 115a, and the fourth cooling slot 126a. It may refer to part or all. The second cooling channel 128b may partially or entirely cover the path from the inlet 123 to the outlet 124b via the third cooling slot 125, the second cooling slot 115b, and the fourth cooling slot 126b. May be referred to.

The first cooling slots 115a and the second cooling slots 115b are exposed to the second surface 112 when viewed as the first mold plate 110 alone, but the third cooling slots 125 and Except for overlapping portions with the four cooling slots 126a and 126b, the third surface 121 of the second mold plate 120 may be tightly coupled and sealed.

8 is a cross-sectional view illustrating a mold plate assembly 130 ′ according to another embodiment of the present invention. The mold plate assembly 130 ′ according to this embodiment corresponds to a modification of some configurations in the mold plate assembly 130 of FIGS. 4 to 6, and thus duplicated description is omitted in both embodiments.

Referring to FIG. 8, the second mold plate 120 ′ may include a pair of inlets 123a and 123b and a pair of third cooling slots 125a and 125b. The inlets 123a and 123b may be connected to the first cooling slots 115a and the second cooling slots 115b through the third cooling slots 125a and 125b, respectively. For example, one inlet 123a is connected to the first cooling slot 115a through the third cooling slot 125a, and the other inlet 123b is second cooled through the third cooling slot 125b. May be connected to the slot 115b. 4 to 6 in that the cooling medium in the mold plate assembly 130 'is separated into each of the first cooling slots 115a and the second cooling slots 115b through the inlets 123a and 123b. It may be distinguished from the mold plate assembly 130.

In a modified example of this embodiment, the first mold plate 110 may be replaced with the mold plate 110 ′ of FIG. 3.

In another embodiment of the present invention, in the above-described mold plate assembly 130 of FIGS. 4 to 6, the first mold plate 110 and the second mold plate 120 are integrally provided, and the mold plate of FIG. 8 is provided. In the assembly 130 ′, the first mold plate 110 and the second mold plate 120 ′ may be integrally provided. In this case, the mold plate assemblies 130, 130 ′ may be referred to simply as a mold plate.

9 is a perspective view showing a mold 100 according to an embodiment of the present invention. FIG. 10 is a schematic plan view of the mold 100 of FIG. 9.

Referring to FIG. 9, the mold 100 may include a plurality of mold plate assemblies 131, 132, 133, and 134. At least one of the mold plate assemblies 131, 132, 133, 134 may refer to the mold plate assembly described above. For example, the mold plate assemblies 131, 132, 133, 134 may include the structure of FIGS. 4, 5, 6, and 8 and variations thereof. The first mold plate 110 in the mold plate assemblies 131, 132, 133, and 134 may include the structure of FIGS. 1 to 3 and a variant thereof.

The mold plate assemblies 131, 132, 133, 134 may be combined into a suitable shape to define the slab shape. For example, as shown in FIG. 9, the four mold plate assemblies 131, 132, 133, 134 are joined using a suitable fastening means, such as a bolt structure, in a quadrangular shape for producing slab shaped slabs. Can be.

The mold plate assemblies 131 and 132 form the light side surfaces of the mold 100 and the mold plate assemblies 133 and 134 may form the short side surfaces of the mold 100. In this case, when the mold plate assemblies 133 and 134 are moved in the y-axis direction, the width of the slab shape may be changed. The shape of the mold 100 is shown by way of example, and may be appropriately modified according to the shape of the cast steel.

The recesses (113 in FIG. 1) of the mold plate assemblies 131, 132 on the light side surfaces may define a funnel shape. The length of the mold plate assemblies 133, 134 on the side surfaces of the short sides is shortened during the casting of the flake-shaped casting, and therefore the injection of the molten metal may be difficult. However, because of the above-described funnel shape, the width of the molten metal outlet portion can be widened while the width of the molten metal outlet portion is kept thin, thereby increasing the casting speed and efficiency.

Referring to FIG. 10, the four corner regions C are subjected to overlapping cooling from two intersecting ones of the mold plate assemblies 131, 132, 133, 134, thereby effecting cooling from a single mold plate assembly. There is a risk of cooling faster than the other parts received. However, since the cooling temperature at the individual ends of the mold plate assemblies 131, 132, 133, 134 is lower than the cooling temperature at the center, the cooling rate of the cast steel in the four corner regions C in the mold 100 is different. Part will be approximately equal to the cooling rate of the cast steel. Therefore, when the mold 100 is used, the initial cooling rate of the cast steel can be made uniform throughout the cast steel.

11 is a schematic view showing a casting apparatus according to an embodiment of the present invention. For example, the casting device according to this embodiment may be part of a continuous casting device.

Referring to FIG. 11, the tundish 152 may include a molten metal formed at a high temperature, such as molten steel 50. The immersion nozzle 154 may be connected to the bottom surface of the tundish 152 so that an end thereof may be inserted into the mold 100. The mold 100 may refer to the mold of FIG. 10. Accordingly, the molten steel 50 is injected into the mold 100 from the tundish 152 through the immersion nozzle 154 to form the solidification layer 51 and undergo an initial solidification process. The solidification layer 51 exiting the mold 100 is cooled by a cooling medium injected through the spray nozzle 156 to form a slab 55 having a predetermined shape, for example, a slab shape. Subsequently, the cast steel 55 is guided by the guide roll 158 and moved to the next step.

The initial solidification process of the molten steel 50 flowing into the mold 100 is one of the important factors that determine the properties of the cast steel is completed continuous casting. The mold 100 may provide a primary cooling process for forming a solidification shell having a uniform initial solidification layer having appropriate strength during initial solidification of the molten steel 50. The solidification shell formed during the primary cooling process may be solidified while undergoing the secondary cooling process through the spray nozzle 156 to become a cast steel 55 such as slabs.

According to the casting apparatus according to this embodiment, as described above, by uniformly controlling the cooling conditions in the mold 100 during primary cooling, the cast steel 55 is distorted or cracks are generated in the cast steel 55. Can be suppressed.

The foregoing description of specific embodiments of the invention has been presented for purposes of illustration and description. Therefore, the present invention is not limited to the above embodiments, and various modifications and changes can be made by those skilled in the art within the technical spirit of the present invention in combination with the above embodiments. Do.

110, 120: mold plate 111: first side
112: second side 113: recessed portion
114; Flat portion 115a; First cooling slot
115b: second cooling slot 118: cover member
128a: first cooling channel 128b: second cooling channel
116a and 116b: inlet 117a and 117b: outlet
130, 131, 132, 133, 134: mold plate assembly
123: inlet 124a, 124b: outlet
125: third cooling slot 126a, 126b: fourth cooling slot
100: mold 152: tundish
154: immersion nozzle 156: spray nozzle
158: guide roll

Claims (12)

A first surface including a recess in an upper portion thereof;
A second face opposite the first face;
At least one first cooling channel extending from the center of the second surface to intersect with the casting direction of the molten metal; And
At least one second cooling channel extending in a direction opposite to an extending direction of the at least one first cooling channel so as to intersect a casting direction of the molten metal from a central portion of the second surface,
The thickness from the bottom surface of the one ends of the at least one first and second cooling channels adjacent to the central portion of the second surface to the first surface is equal to the at least one first and adjacent surfaces of the second surface. The mold plate for casting smaller than the thickness from the bottom surface of the other ends of the second cooling channels to the first surface. 2. The casting mold plate of claim 1, wherein the thickness from the bottom surface of the at least one first and second cooling channels to the first surface increases gradually from the central portion of the second surface to both ends. The method of claim 1, wherein the at least one first cooling channel comprises at least one first cooling slot formed recessed in the direction of the first surface from the second surface,
Wherein the at least one second cooling channel comprises at least one second cooling slot recessed in the direction of the first surface from the second surface and disposed in parallel with the at least one first cooling slot. plate. 4. The casting mold plate of claim 3, wherein the depth of the at least one first and second cooling slots in the first face direction decreases gradually from the center of the second face toward the both ends. The method of claim 3, wherein the at least one outlet portion defines at least one inlet portion through which a cooling medium flows into a central portion of the second surface, and defines at least one pair of outlet portions through which cooling medium is discharged at both ends of the second surface. And a lid member spaced apart from the bottom surface of the first and second cooling slots of the casting mold plate. The casting mold plate of claim 5, wherein a distance from an inner side wall of the lid member within the at least one first and second cooling slots to a bottom surface of the at least one first and second cooling slots is constant. . A first mold plate and a second mold plate;
The first mold plate,
A first surface in contact with the molten metal and including a concave portion at an upper portion thereof;
A second face opposite the first face,
At least one first cooling slot extending from the central portion of the second surface to intersect with the casting direction of the molten metal, and
At least one second cooling slot extending in a direction opposite to an extending direction of the at least one first cooling slot so as to intersect with the casting direction of the molten metal from a central portion of the second surface,
The second mold plate,
A third surface coupled to face the second surface of the first mold plate, and
A fourth face opposite the third face,
The thickness from the bottom surface of the one ends of the at least one first and second cooling slots adjacent to the central portion of the second surface to the first surface is equal to the at least one first and second surfaces adjacent to both ends of the second surface. A casting mold plate assembly, which is smaller than the thickness from the bottom surface of the other ends of the second cooling slots to the first surface. The method of claim 7, wherein the second mold plate,
At least one inlet connected to one ends of the at least one first and second cooling slots adjacent the central portion of the second face; And
And at least a pair of outlets connected to the other ends of said at least one first and second cooling slots adjacent to both ends of said second face. 9. The method of claim 8, wherein the second mold plate is formed recessed in the direction of the fourth surface from the third surface and extends across the at least one first and second cooling slots and the at least one inlet and And at least one third cooling slot commonly connected to said at least one first and second cooling slots. 9. The method of claim 8, wherein the second mold plate is formed recessed in the direction of the fourth surface from the third surface and extends across the at least one first and second cooling slots and the at least one pair of outlets. And at least a pair of fourth cooling slots connecting the at least one first and second cooling slots to each other. 9. The apparatus of claim 8, wherein the first mold plate further comprises a lid member spaced apart from a bottom surface of the at least one first and second cooling slots between the at least one inlet and the at least one pair of outlets. Including,
And a distance from an inner wall of the lid member within the at least one first and second cooling slots to a bottom surface of the at least one first and second cooling slots is constant. A plurality of mold plate assemblies coupled to define the slab shape,
At least one of the plurality of mold plate assemblies comprises a casting mold plate according to any one of claims 1 to 6 or a mold plate assembly for casting according to any one of claims 7 to 11. Casting mold characterized by the above-mentioned.

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