JP2008036661A - Tundish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tundish with a simple structure which does not disturb the flow of molten metal as far as possible in such a manner that the floating-up and separation of non-metallic inclusions can be promoted. <P>SOLUTION: In the tundish, a plurality of communication passages 4 each having a longitudinal direction are provided. The communication passages 4a(4b) have at least one cross part being a cross point α or a cross line mutually crossing in the tangential direction of the outer circumferential faces of the communication passages 4a(4b) in the parts AA(BB) at which the communication passages 4a(4b) are connected with a molten metal pouring chamber 5, and also the direction in which elongated faces A(B) obtained by elongating the outer circumferential faces along the longitudinal direction of the communication passages 4a(4b) go from a receiving chamber 3 to the molten metal pouring chamber 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tundish, which is a molten metal container used when pouring molten metal into a mold.

  Conventionally, in the separation and removal of non-metallic inclusions present in the molten metal received in the tundish, cleaning of the molten metal having a configuration in which non-metallic inclusions are adhered and absorbed on a plurality of plates made of CaO-based refractory. A method is known (see, for example, Patent Document 1). In this molten metal cleaning method, a plurality of plates made of CaO-based refractories are alternately arranged in a tundish, and the flow rate of molten metal passing between the plates of these CaO-based refractories is increased. This is a method of promoting adhesion and absorption of non-metallic inclusions to the CaO refractory by increasing the turbulence to be generated and taking a longer time for the molten metal to pass through the vicinity of the CaO refractory.

  A technique related to tundish is also known in which molten metal is received in a swirl tank and non-metallic inclusions are floated and separated by horizontally swirling the molten metal (see, for example, Patent Document 2). This technology for levitating and separating non-metallic inclusions applies a moving magnetic field to a swirling tank filled with molten metal to apply a centrifugal force due to horizontal swirling to the molten metal, and the non-metallic inclusions are caused by a difference in specific gravity between the molten metal and non-metallic inclusions. This is a technique in which metal inclusions are collected at the center of a swirl tank, and nonmetallic inclusions are floated and separated by promoting collision, adsorption, and aggregation.

  Also known is a technique relating to a tundish that receives molten metal in a circulating tank, horizontally swirls the molten metal, and flows non-metallic inclusions by flowing an inert gas through the circulating tank (for example, patents). Reference 3). This technology for floating and separating non-metallic inclusions introduces molten metal from the inside of a long nozzle having at least one discharge hole with an angle having a horizontal unidirectional component into the circulation tank when the molten metal is received in the circulation tank. In addition, while flowing an inert gas into the long nozzle, the molten metal is discharged in the tangential direction of the circulating tank at a position near the bottom surface away from the swirling center of the circulating tank, thereby imparting centrifugal force to the molten metal and non- At the same time as collecting metal inclusions in the center of the circulation tank, the bubbles of inert gas are concentrated in the center of the rotation, thereby aggregating and coalescing the nonmetallic inclusions in the molten metal into the gas bubbles and floating the nonmetallic inclusions. It is a technique of separation.

Japanese Patent Laid-Open No. 05-50193 Japanese Patent Laid-Open No. 06-597 JP 07-290210 A

  However, in the method of cleaning molten metal in which non-metallic inclusions are adhered and absorbed on a plurality of plates made of CaO-based refractories described in Patent Document 1, non-metallic inclusions of CaO-based refractory can be obtained by long-term continuous use. Adhesion absorption to the board formed with a thing accumulates, and it may become impossible to maintain an appropriate board interval. Therefore, in this configuration, since a preliminary path for flowing molten metal is not secured, there is a problem that the operation must be stopped because one path cannot be used. In addition, since this method actively generates turbulent flow, mixing of non-metallic inclusions is promoted, and in terms of floating separation of non-metallic inclusions in the tundish, it leads to a decrease in the floating rate. It will be.

  On the other hand, in the technology for horizontally swirling the molten metal described in Patent Document 2 to float and separate non-metallic inclusions, the swirl component of the flow rate of the molten metal generated in the swirl tank reaches the inside of the float tank, and the float tank The flow of molten metal in the inside may be disturbed, and the floating of non-metallic inclusions in the floating tank may be hindered. In addition, when there are a plurality of pouring nozzles provided in the levitation tank, the flow rate of the molten metal at each pouring nozzle outlet may become non-uniform due to the non-uniform flow velocity distribution in the levitation tank. is there. In addition, the present technology requires a moving magnetic field generator, which may increase cost and make the device complicated.

  Further, in the technology for horizontally rotating the molten metal described in Patent Document 3 and flowing the inert gas into the circulation tank to float and separate non-metallic inclusions, as in the technique described in Patent Document 2, the circulation tank The swirl component of the flow rate of the molten metal generated inside reaches the inside of the rectifying tank, and the flow of the molten metal in the rectifying tank is disturbed, which may hinder the rise of nonmetallic inclusions in the rectifying tank. . In addition, when there are a plurality of pouring nozzles provided in the rectifying tank, the flow rate of the molten metal at each pouring nozzle outlet may become non-uniform due to the uneven flow velocity distribution in the rectifying tank. is there. In addition, since the long nozzle is disposed at a position away from the swivel center of the circulation tank in the present technology, a long nozzle having a sufficient structure is required, and an inert gas injection device is also required. Therefore, it can be considered that the cost is increased and the apparatus is complicated.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tundish having a simple structure without disturbing the flow of molten metal as much as possible so as to promote floating separation of nonmetallic inclusions. There is to do.

Means and effects for solving the problems

  The tundish according to the present invention includes a receiving chamber for receiving molten metal from a ladle, a pouring chamber for pouring the molten metal into a mold, and the molten metal by communicating the receiving chamber and the pouring chamber. It relates to a tundish provided with a communication passage for flowing the water from the receiving chamber to the pouring chamber. The tundish according to the present invention has the following features in order to achieve the above object. That is, the tundish of the present invention has the following features alone or in combination as appropriate.

  The first feature of the tundish according to the present invention for achieving the above object is that the communication passage is provided in a plurality having a longitudinal direction, and the communication passage is in a portion where the communication passage is connected to the pouring chamber. A plurality of extended surfaces extending in the tangential direction of the outer peripheral surface and extending along the longitudinal direction of the communication passage intersect each other in the direction from the receiving chamber toward the pouring chamber. Having at least one intersection that is a line.

  According to this configuration, compared to the case where the communication path does not have a longitudinal direction, the effect of reducing the flow velocity in the communication path of the molten metal received from the ladle is large. Thus, the molten metal flow rate introduced into the molten metal chamber can be made smaller than the case where the communication path does not have a longitudinal direction. Further, by providing a plurality of communication passages, for example, when the total cross-sectional area of the communication passages is made equal, the total contact area of the molten metal with the communication passage walls becomes larger than in the case of one communication passage, resulting in pressure loss. Since the resistance increases, the effect of reducing the flow velocity of the molten metal in the communication path compared to the case where there is one communication path is large. Therefore, the communication path has a longitudinal direction and a plurality of communication paths are provided. The turbulence in the pouring chamber of the molten metal flow introduced into the pouring chamber via this communication path can be further reduced.

  Furthermore, by providing a plurality of communication paths, for example, even when one communication path is blocked, the remaining communication paths can be used, so that the operation is stopped due to the blockage of one communication path. It can also be avoided. In addition, for example, since there is no additional device such as a moving magnetic field generator described in Patent Document 2 or an inert gas injection device described in Patent Document 3, the cost can be suppressed and the structure can be simplified. Become.

  Here, there are a plurality of extension surfaces extending in the tangential direction of the outer peripheral surface of the communication passage at a portion where the communication passage is connected to the pouring chamber, and extending the outer peripheral surface along the longitudinal direction of the communication passage. And having at least one intersection that is an intersection or a crossing line that intersect each other in the direction from the receiving chamber to the pouring chamber has a spread introduced into the pouring chamber through a plurality of communication passages. Before the molten metal flow that flows in this way collides with the wall surface in the pouring chamber, at least a part of the flow merges into one large flow. Thereby, the molten metal flow which became one big flow implement | achieves a symmetrical flow on the horizontal surface in a pouring chamber. Compared to the case where a plurality of flows of molten metal individually collide and disperse against the wall surface of the pouring chamber and then collide with each other and interfere with each other, the turbulence of the flow of molten metal can be suppressed, Therefore, the floating rate of the nonmetallic inclusions present in the molten metal can be increased, and the floating separation of the nonmetallic inclusions can be promoted.

  Further, a second feature of the tundish according to the present invention is that the intersecting portion is an intersection or intersecting line where a plurality of the extension surfaces first intersect with each other in a direction from the receiving chamber toward the pouring chamber. It is a 1st crossing part, and the said communication path is provided so that the said 1st crossing part may exist in the said pouring chamber.

  According to this configuration, compared with the case where the first intersecting portion is outside the pouring chamber, the molten metal flow that flows through the communication path and that is introduced into the pouring chamber collides with the wall surface in the pouring chamber. The rate of merging before it increases. Accordingly, the plurality of molten metal flows merge with each other to form one larger flow. On the contrary, the ratio of the molten metal flow in which the plurality of flows of the molten metal each first impinge on the wall surface in the pouring chamber and disperse becomes small. Therefore, the rate at which a plurality of single molten metal flows collide with each other and interfere with each other is reduced. Therefore, the effect of suppressing the turbulence of the molten metal flow in the pouring chamber due to the collision of the molten metal flow is increased. Thereby, the floating rate of the nonmetallic inclusions present in the molten metal can be increased, and the floating separation of the nonmetallic inclusions can be promoted.

  Further, a third feature of the tundish according to the present invention is that the plurality of extending surfaces are opposed to the pouring wall facing the connecting wall of the pouring chamber where the communication path connects to the pouring chamber. The communication path is provided so as to be symmetrical with respect to the normal line.

  According to this configuration, the synthesized component of the molten metal flow obtained by synthesizing the plurality of molten metal flows is a component in a direction substantially perpendicular to the opposing wall surface. That is, as the entire flow of the molten metal, the molten metal flow colliding with the opposing wall surface collides with the opposing wall surface at a substantially right angle, and is distributed almost uniformly around the periphery. Here, for example, even when the opposing wall surface is not perpendicular to the horizontal plane but is inclined obliquely upward from the receiving chamber toward the pouring chamber, the molten metal flow is inclined obliquely upward. After colliding with the opposite wall surface, most of them do not flow upward along the opposite wall surface but are distributed almost evenly around. Therefore, even when the opposing wall surface is not perpendicular to the horizontal plane and is inclined obliquely upward from the receiving chamber toward the pouring chamber, the nonmetallic inclusions float and stay. It is possible to suppress a flow that causes a reduction in the removal rate of non-metallic inclusions such as stirring the surface layer in the pouring chamber.

  Further, a fourth feature of the tundish according to the present invention is that the intersecting portion has the pouring chamber 2 in a direction perpendicular to a connection wall surface of the pouring chamber where the communication path connects to the pouring chamber. The communication path is provided so as to lie on a vertically symmetric plane that equally divides.

  According to this configuration, since the plurality of molten metal flows introduced from the plurality of communication passages have an equal dispersion space on both sides in the horizontal direction in the pouring chamber, one side of the molten metal on one side of the horizontal side after the merge The uneven flow to the water can be prevented, and the disturbance of the flow in the pouring chamber can be suppressed. Therefore, the floating rate of the nonmetallic inclusions present in the molten metal can be increased, and the floating separation of the nonmetallic inclusions can be promoted.

  Further, a fifth feature of the tundish according to the present invention is that the communication passage is configured such that the pouring chamber is arranged in a direction perpendicular to a connection wall surface of the pouring chamber connected to the pouring chamber. It is to be provided symmetrically on both sides of a vertically symmetric plane that equally divides.

  According to this configuration, at the position where the molten metal is introduced into the pouring chamber, the space through which the molten metal flows from the receiving chamber toward the pouring chamber is ensured to be substantially the same on the left and right. Therefore, a non-uniform flow to one side in the horizontal direction in the pouring chamber can be prevented, and a reduction in the removal rate of nonmetallic inclusions can be suppressed.

  A sixth feature of the tundish according to the present invention is that the communication passages are equal in vertical height and are provided horizontally.

  According to this configuration, it is possible to prevent the flow of molten metal including non-metallic inclusions introduced from the communication path from going directly to the pouring outlet provided in the bottom surface of the pouring chamber, and to melt including non-metallic inclusions. It is possible to suppress a decrease in the removal rate of non-metallic inclusions such that the metal is discharged from the pouring outlet through the shortest path. Moreover, the flow toward the surface layer in the pouring chamber formed by non-metallic inclusions floating and staying can be prevented, and the non-metallic inclusions can be removed by stirring the surface layer containing the non-metallic inclusions. A flow that causes a decrease in rate can be suppressed.

  Further, a seventh feature of the tundish according to the present invention is that the pouring chamber has a plurality of pouring outlets for pouring the molten metal into a mold on a bottom surface, and the plural pouring outlets are The communication path is arranged on one straight line parallel to the connecting wall surface of the pouring chamber connected to the pouring chamber, and the intersecting portions are arranged at both ends of the plurality of pouring outlets. The communication path is provided so as to be equidistant from the two pouring outlets.

  According to this configuration, it is possible to make the flow rate of the molten metal poured into the mold of the subsequent equipment almost uniform. In addition, since there are multiple hot water outlets, for example, when maintenance such as cleaning is required for equipment after one hot water outlet, the equipment after the remaining hot water outlet can be used, so the equipment is completely There is no need to stop, and production efficiency and maintenance are excellent.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. The tundish according to the present invention is used, for example, for continuous casting in an iron making process. However, it can also be used in batch-type casting processes such as ingot ingot casting.

  FIG. 1 is a schematic vertical sectional view of a tundish 1 according to an embodiment of the present invention. The tundish 1 according to this embodiment floats and removes non-metallic inclusions contained in the molten metal received from the ladle, and pours the molten metal from which the non-metallic inclusions are removed into a mold. It is a container for casting. The tundish 1 is provided with a receiving nozzle 2 for receiving the molten metal from the ladle, floats and separates the receiving chamber 3 for receiving the molten metal, and non-metallic inclusions in the molten metal, and on the bottom surface. A pouring outlet 6 for pouring the molten metal into the mold is provided, and the pouring chamber 5 for pouring the molten metal into the mold is communicated with the receiving chamber 3 and the pouring chamber 5 to receive the molten metal. A molten metal container including a communication passage 4 for flowing from the hot water to the pouring chamber 5. The arrows in FIG. 1 indicate the flow direction of the molten metal.

  The receiving chamber 3 is for receiving the molten metal from the ladle through the receiving nozzle 2 and for flowing the molten metal to the pouring chamber 5 through the communication passage 4. A non-metallic inclusion layer 11 is formed in which non-metallic inclusions such as alumina or zirconia having a specific gravity lighter than that of metal are levitated. The pouring chamber 5 is for receiving the molten metal through the communication passage 4 and pouring the molten metal into the mold of the subsequent equipment through the pouring outlet 6 and is included in the molten metal. This is for floating and separating the non-metallic inclusions. A non-metallic inclusion layer 11 in which the non-metallic inclusions are levitated is formed on the top of the pouring chamber 5.

  FIG. 2 is a schematic plan view of a tundish 1 according to an embodiment of the present invention. The communication path 4 of the tundish 1 according to the present embodiment has a longitudinal direction, and has two communication paths 4 formed of a communication path 4a and a communication path 4b as shown in FIG. Here, the communication path 4 is not limited to two, and a plurality of communication paths 4 such as three may be provided. In addition, although the flow path cross-sectional shape of the communicating path 4 which concerns on this embodiment is both circular, the cross-sectional shape of the communicating path 4 may be a rectangle or a polygon. The cross-sectional area of the communication path 4 is preferably set to an optimum size according to the size of the tundish 1, the casting speed, the height at which the communication path 4 is provided, and the like. Further, an extension surface A extending in the tangential direction of the outer peripheral surface of the communication passage 4a in the portion AA where the communication passage 4a connects to the pouring chamber 5, and extending the outer peripheral surface along the longitudinal direction of the communication passage 4a; An extension surface B that is a tangential direction of the outer peripheral surface of the communication passage 4b in the portion BB where the communication passage 4b is connected to the pouring chamber 5 and that extends the outer peripheral surface along the longitudinal direction of the communication passage 4b. First, they cross each other in the direction from the chamber 3 to the pouring chamber 5. Further, the intersection α is present in the pouring chamber 5 and bisects the pouring chamber 5 in the direction perpendicular to the connecting wall surface of the pouring chamber 5 where the communication passage 4 connects to the pouring chamber 5. It is also on the vertical symmetry plane γ.

  In addition, the extended surface A which extended the outer peripheral surface of said communicating path 4a along the longitudinal direction of the communicating path 4a, and the extended surface B which extended the outer peripheral surface of the communicating path 4b along the longitudinal direction of the communicating path 4b The intersection is a point. Since the cross sections of the communication path 4a and the communication path 4b are both circular, and the extension surface A and the extension surface B are both cylindrical surfaces, the two cylindrical surfaces This is because, at the beginning, they intersect at a point. However, for example, when the cross sections of the communication path 4a and the communication path 4b are both rectangular, the above intersection may be a line.

  Here, as compared with the case where the intersection α is outside the pouring chamber 5, the molten metal flow that flows through the communicating passage 4 a or the communicating passage 4 b and having a spread introduced into the pouring chamber 5 is provided. The ratio of joining before colliding with the wall surface in 5 increases. Accordingly, the plurality of molten metal flows merge with each other to form one larger flow. On the other hand, the ratio of the molten metal flow in which the plurality of flows of molten metal each first impinge on the wall surface in the pouring chamber 5 and disperse becomes small. Therefore, the rate at which a plurality of single molten metal flows collide with each other and interfere with each other is reduced.

  Furthermore, since the molten metal flow from the communication path 4a and the molten metal flow from the communication path 4b merge on the vertical symmetry plane γ, the molten metal flow after merging is symmetric with respect to the vertical symmetry plane γ. Will be dispersed. Therefore, disturbance of the molten metal flow can be further suppressed.

  In the above-described embodiment, almost all of the molten metal flow from the communication passage 4 a and the molten metal flow from the communication passage 4 b merge in the pouring chamber 5. However, if at least a part of the flow of the molten metal flow that flows in a wide area joins before the molten metal flow collides with the wall surface in the pouring chamber 5, turbulence of the molten metal flow can be suppressed. That is, the extension surface A and the extension surface B may cross each other in the direction from the receiving chamber 3 toward the pouring chamber 5, and the intersecting portion is not limited to the pouring chamber 5.

  Further, the extension surface A and the extension surface B are symmetrical with each other with respect to the normal line of the facing wall surface of the pouring chamber 5 facing the connection wall surface of the pouring chamber 5 where the communication passage 4 connects to the pouring chamber 5. As described above, the communication path 4 is preferably provided.

  When the communication path 4a and the communication path 4b are arranged in this way, a combined component of the molten metal flow obtained by combining a plurality of molten metal flows is a component in a direction substantially perpendicular to the opposing wall surface. That is, as the entire flow of the molten metal, the molten metal flow colliding with the opposing wall surface collides with the opposing wall surface at a substantially right angle, and is distributed almost uniformly around the periphery. Here, for example, even when the facing wall surface is not perpendicular to the horizontal plane but is inclined obliquely upward from the receiving chamber 3 toward the pouring chamber 5, the molten metal flow is obliquely upward. After colliding with the opposing wall surface inclined in the direction, most of it does not flow upward along the opposing wall surface but is distributed almost uniformly around. Therefore, even if the opposing wall surface is not perpendicular to the horizontal plane and is inclined obliquely upward from the receiving chamber 3 toward the pouring chamber 5, non-metallic inclusions float and stay. Thus, it is possible to suppress a flow that causes a reduction in the removal rate of non-metallic inclusions such as stirring the non-metallic inclusion layer 11 in the pouring chamber 5 formed.

  In addition, the communication path 4 a and the communication path 4 b of the tundish 1 according to the present embodiment are connected to the connection wall surface of the pouring chamber 5 where the communication path 4 connects to the pouring chamber 5 as shown in FIG. 2. Both sides of a vertical symmetry plane γ that bisects the pouring chamber 5 in the vertical direction are provided symmetrically, and as shown in FIG. 1, both have the same vertical height and are provided horizontally. . It is preferable to arrange the communication passage 4 a and the communication passage 4 b in this way in order to prevent a non-uniform flow of molten metal in the pouring chamber 5. However, the arrangement of the communication path 4a and the communication path 4b is not limited to this.

  Further, two pouring outlets 6 are provided on the bottom surface of the pouring chamber 5 for pouring molten metal into the mold of the subsequent equipment. The communication path 4a and the communication path 4b are provided so that the intersection where the molten metal flows from the communication path 4a and the communication path 4b join is located at an equal distance from the pouring outlet 6a and the pouring outlet 6b. ing. By carrying out like this, the flow volume of the molten metal poured into a casting_mold | template via the pouring exit 6a and the pouring exit 6b can be made substantially uniform. In addition, it is preferable that a plurality of the pouring outlets 6 are provided as in the present embodiment in consideration of production efficiency and maintainability. However, it is not limited to two like this embodiment.

  Hereinafter, the numerical analysis result about the floating separation of the nonmetallic inclusions contained in the molten metal performed based on the tundish 1 according to the embodiment of the present invention shown in FIGS. 1 and 2 will be described. FIG. 3 shows a tundish in which the communication path 4′a and the communication path 4′b communicating with the receiving chamber 3 and the pouring chamber 5 are arranged in parallel to each other, and the other configurations are the same as the tundish 1 described above. 30 is a schematic diagram showing a numerical analysis result based on the tundish 30 as a comparison target.

  The analysis conditions were the same for both the numerical analysis of the tundish 1 and the numerical analysis of the tundish 30, and the flow analysis of alumina-based nonmetallic inclusion particles having a particle diameter of 100 μm was performed.

  As a numerical analysis result, the analysis result of the tundish 1 according to the embodiment of the present invention has a floating particle ratio of about 55%. On the other hand, in the analysis result of the tundish 30 in which the two communication paths are arranged in parallel, the ratio of the floating particles is about 38%. Therefore, the analysis result of the tundish 1 clearly has a higher ratio of floating particles, that is, the floating separation efficiency is high.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

  For example, FIG. 4 is a schematic plan view showing a tundish 101 according to another embodiment of the present invention. The tundish 101 shown in FIG. 4 is different from the communication path 4 of the tundish 1 in the shape of the communication path 7. The communication passage 7a and the communication passage 7b are initially substantially parallel to each other in the direction from the receiving chamber 3 to the pouring chamber 5, but the communication passage 7a (7b) is connected to the pouring chamber 5 in the middle. The portion AA ′ (BB ′) bends toward the tangential direction of the outer peripheral surface of the communication passage 7 a (7 b), and the extension surface A ′ and the extension surface B ′ intersect in the pouring chamber 5. (Intersection α1).

  The intersection α1 is also on a vertical symmetry plane γ that bisects the pouring chamber 5 in the vertical direction with respect to the connecting wall surface of the pouring chamber 5 where the communication passage 7 connects to the pouring chamber 5.

It is a longitudinal cross-sectional schematic diagram which shows the tundish which concerns on one Embodiment of this invention. It is a plane cross-sectional schematic diagram which shows the tundish which concerns on one Embodiment of this invention. It is a plane cross-sectional schematic diagram which shows the other tundish characterized by the two communication paths arrange | positioning in parallel. It is a plane cross-sectional schematic diagram which shows the tundish which concerns on other embodiment of this invention.

Explanation of symbols

1 Tundish 2 Receiving nozzle 3 Receiving chamber 4 Communication passage 5 Pouring chamber 6 Pouring outlet 11 Non-metallic inclusion layer A Extension surface of outer peripheral surface of communication passage 4a B Extension surface of outer peripheral surface of communication passage 4b α Intersection γ Note Vertically symmetric surface 30 of hot water chamber 5 Other tundish with parallel passages

Claims (7)

A receiving chamber for receiving molten metal from a ladle, a pouring chamber for pouring the molten metal into a mold, and the receiving chamber and the pouring chamber communicated with each other to allow the molten metal to be poured from the receiving chamber. A tundish with a communication passage for flowing into the chamber,
The communication path has a longitudinal direction and is provided in a plurality.
A plurality of extension surfaces extending in the tangential direction of the outer peripheral surface of the communication passage at a portion where the communication passage connects to the pouring chamber and extending the outer peripheral surface along the longitudinal direction of the communication passage, A tundish characterized by having at least one intersection that is an intersection or an intersection line that intersect each other in a direction from a chamber toward the pouring chamber. The intersecting portion is a first intersecting portion in which a plurality of extending surfaces are intersecting points or intersecting lines that first intersect each other in a direction from the receiving chamber toward the pouring chamber,
The tundish according to claim 1, wherein the communication path is provided so that the first intersecting portion is in the pouring chamber.   The plurality of extension surfaces are symmetrical with each other with respect to the normal line of the opposing wall surface of the pouring chamber facing the connecting wall surface of the pouring chamber where the communication path is connected to the pouring chamber. The tundish according to claim 2, wherein a communication path is provided.   The communication path is such that the intersecting portion is on a vertical symmetry plane that bisects the pouring chamber in a direction perpendicular to a connection wall surface of the pouring chamber connected to the pouring chamber. The tundish according to any one of claims 1 to 3, wherein the tundish is provided.   The communication path is provided symmetrically on both sides of a vertical symmetry plane that bisects the pouring chamber in the vertical direction with respect to the connection wall surface of the pouring chamber connected to the pouring chamber. The tundish according to any one of claims 1 to 4, wherein the tundish is characterized.   The tundish according to any one of claims 1 to 5, wherein the communication paths have the same vertical height and are provided horizontally. The pouring chamber has a plurality of pouring outlets for pouring the molten metal into a mold on the bottom surface,
The plurality of pouring outlets are arranged on one straight line parallel to the connecting wall surface of the pouring chamber where the communication path connects to the pouring chamber.
The communication path is provided so that the intersecting portion is located at an equal distance from two pouring outlets arranged at both ends of the pouring outlets. The tundish according to any one of claims 6 to 7.

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