Title of the invention: Side seal device, twin roll type continuous casting device, and method for manufacturing thin cast piece
Technical field
[0001]
　The present invention is a side seal device used in a twin roll type continuous casting device for producing a thin cast piece by supplying a molten metal to a space formed by a pair of cooling rolls and a pair of side dams to form a molten metal pool, The present invention relates to a twin roll type continuous casting device equipped with this side seal device, and a method for manufacturing a thin cast piece.
　The present application claims priority based on Japanese Patent Application No. 2017-214782 filed in Japan on November 7, 2017, and the content thereof is incorporated herein.
Background technology
[0002]
　As a method for producing a thin-walled slab of metal, a pair of cooling rolls having a water-cooling structure and rotating in opposite directions are provided inside, and molten metal is contained in a space formed by a pair of rotating cooling rolls and a pair of side dams. To form a molten metal pool, to form and grow a solidified shell on the peripheral surface of the cooling roll, the solidified shells respectively formed on the outer peripheral surface of the pair of cooling rolls are crimped at a roll kiss point to a predetermined A twin-roll continuous casting machine for producing a thin-walled slab having a thickness is provided. Such a twin roll type continuous casting apparatus is applied to various metals.
[0003]
　In the twin roll type continuous casting apparatus described above, the molten metal is continuously supplied from the tundish arranged above the cooling roll to the molten metal pool section through the immersion nozzle. The molten metal is discharged toward the peripheral surface of the cooling roll from an immersion nozzle arranged in the center of the molten metal pool portion, and flows to the pair of side dams along the peripheral surface of the cooling roll. On the peripheral surface of the rotating cooling roll, the molten metal solidifies and grows to form a solidified shell, and the solidified shell on the peripheral surface of each cooling roll is pressure-bonded at roll kiss points.
[0004]
　Here, in the above-mentioned twin roll type casting device, the side dam is pressed against both end faces of the cooling roll to form the molten metal pool portion. The part of the side weir that comes into contact with the end surface of the cooling roll has excellent heat resistance because it withstands high temperatures and wears itself to maintain a seal with the end surface of the cooling roll. Is also made of a soft material, and a boron nitride refractory is usually used when manufacturing a thin cast piece of steel.
[0005]
　Further, when the gap between the end surface of the cooling roll and the contact surface of the side dam exceeds 0.2 mm, the molten metal is inserted into this gap and solidifies to form burrs, which impairs the quality of the thin cast piece. Not only that, with the rotation of the cooling roll, the burr scrapes the contact surface of the side weir, the gap becomes larger, the seal breaks, and the molten metal may leak out. Therefore, it is necessary to suppress the gap between the end surface of the cooling roll and the contact surface of the side dam to 0.2 mm or less.
[0006]
　Here, even when the contact state between the end surface of the cooling roll and the contact surface of the side weir is adjusted at room temperature, the side weir becomes high temperature during casting, so the side weir is deformed by thermal expansion, and A gap is created between the end surface and the contact surface of the side dam.
　Further, since the side weir is brought into contact with the rotating cooling roll, the friction force between the end surface of the cooling roll and the contact surface of the side weir causes a positional deviation of the side weir as described later, and a gap is still generated. There was a risk that it would grow.
　Furthermore, in the vicinity of the closest point of the cooling roll (roll kiss point), when the solidified shells on the peripheral surface of the cooling roll are stuck together and pressed down by the cooling roll, the outermost end slightly protrudes from the end face of the cooling roll to the outside, This produces a force in the direction in which the side dam is pushed out of the chill roll. As a result, the gap between the side wall and the end surface of the cooling roll becomes large especially below the side dam, and the sealing may be deteriorated.
[0007]
　As a method of suppressing the deterioration of the seal, for example, Patent Documents 1 and 2 propose a technique of strongly pressing the side weir against the end surface of the cooling roll.
　Further, Patent Document 3 proposes a technique of pushing according to the rigidity of the side weir, and Patent Document 4 proposes a technique of clamping and fixing the backlash of pushing.
　Further, Patent Document 5 proposes a technique for precisely controlling the pushing amount of the side dam.
　Further, in Patent Document 6, the side weir refractory is heated by raising the side weir according to its damage speed and raising the molten metal surface height of the basin according to the rising speed of the side weir. Techniques have been proposed to prevent the peeling of the metal generated by the meniscus of the pool.
Prior art documents
Patent literature
[0008]
Patent Document 1: Japanese Unexamined Patent Publication No. 04-046656
Patent Document 2: Japanese Unexamined Patent Publication No. 05-161944
Patent Document 3: Japanese Unexamined Patent Publication No. 06-277807
Patent Document 4: Japanese Unexamined Patent Publication No. 05-253647 JP
Patent Document 5: Japanese Patent Laid-Open 05-161943 discloses
Patent Document 6: Japanese Patent 2002-219559 JP
Summary of the invention
Problems to be Solved by the Invention
[0009]
　By the way, in the techniques disclosed in Patent Documents 1 and 2, if the side weir is excessively strongly pressed for sealing, it hinders the rotation of the cooling roll, and if the side weir is further strongly pressed, the side weir is destroyed. There was a risk that it could not be performed stably.
　In addition, in the techniques disclosed in Patent Documents 3 and 4, when the rotation speed of the cooling roll, the state of the end surface of the cooling roll, or the like changes, it is possible to follow the change in the frictional force between the cooling roll and the side dam. Therefore, there is a possibility that the seal cannot be kept in good condition.
　Further, the technique disclosed in Patent Document 5 does not have a configuration in which the contact state of the contact surface of the side weir is sufficiently taken into consideration, so it is very difficult to stably control the amount of pushing in the side weir. there were.
　Further, in the technique disclosed in Patent Document 6, the side dam is raised by raising and lowering the pressing device that presses the side dam on both end surfaces of the cooling drum. However, in such a configuration, since the upper side of the side weir is displaced toward the front side toward the cooling roll, it is very difficult to stably control the pushing amount of the side weir.
[0010]
　The present invention has been made in view of the above circumstances, and suppresses the positional deviation of the side weir, and suppresses an increase in the gap between the contact surface of the side weir and the end surface of the cooling roll. An object of the present invention is to provide a side seal device in a twin-roll type continuous casting device capable of stably casting a thin-wall cast product, a twin-roll type continuous casting device, and a method for manufacturing a thin-wall cast product.
Means for solving the problem
[0011]
　In order to solve the above problems, the side sealing device according to the present invention supplies molten metal through a dipping nozzle to a molten metal pool portion formed by a pair of rotating cooling rolls and a pair of side dams, and the cooling is performed. Forming and growing a solidified shell on the peripheral surface of the roll, in a twin roll type continuous casting apparatus for manufacturing a thin cast piece, a side seal device for sealing the end surface side of the cooling roll with the side dam, It is characterized by comprising side weir pressing means for pushing the side weir toward the end surface of the cooling roll, and side weir pulling means for pulling the side weir at least vertically upward.
[0012]
　When the side weir is pressed against the end surface of the cooling roll, a frictional force with the end surface of the rotating cooling roll exerts a downward force on the contact surface of the side weir. Here, the device that holds the side weir and presses against the cooling roll is on the opposite side of the contact surface, and since the side weir is in a cantilever state, if a force pulling it down is applied to the contact surface, As the weir moves downward, the upper side of the side weir falls toward the cooling roll side, leading to a positional deviation. In particular, at the start of casting, the contact surface between the cooling roll end surface and the side dam is static friction and has a large friction coefficient, so that the force of pulling it down becomes large and the side dam tends to be displaced.
[0013]
　Therefore, in the side seal device of the present invention, since the side weir pulling means that pulls the side weir at least vertically upward is provided, the side weir pushing means directs the side weir toward the end surface of the cooling roll. Even if the side weir is pressed, the side weir is prevented from being pulled down, and the positional displacement of the side weir is suppressed. As a result, it is possible to suppress the formation of a large gap between the end surface of the cooling roll and the contact surface of the side dam, and it is possible to stably manufacture the thin cast piece.
[0014]
　Here, in the side seal device according to the present invention, it is preferable that the side weir pulling means is connected to a region above the center of gravity of the side weir.
　In this case, the side dam is connected so as to pull up in the reverse rotation direction in consideration of the axial center of the rotational displacement in which the side dam falls forward toward the cooling roll, and the displacement of the side dam can be further suppressed, and the end surface of the cooling roll can be further suppressed. It is possible to suppress the formation of a large gap between the contact surface of the side weir and the side surface.
[0015]
　Further, in the side seal device according to the present invention, the side dam pulling means supports the side dam or the side dam when the side dam pressing means presses the side dam against the end surface of the cooling roll. The side dam may be engaged with a member and pulled at least vertically upward.
　In this case, when the side weir is pressed against the end surface of the cooling roll, the side weir pulling means is configured to engage with the side weir or a supporting member that supports the side weir, so at the start of casting, It is not necessary to move the side weir pulling means together with the side weir.
[0016]
　Further, in the side seal device according to the present invention, the side dam pulling-up means may be composed of a cylinder that pulls the side dam at least vertically upward by a fluid pressure.
　In this case, the side weir can be reliably pulled at least vertically upward by a hydraulic cylinder, a gas cylinder, or the like.
[0017]
　Further, in the side seal device according to the present invention, the side dam pulling-up means may be configured to pull the side dam at least vertically upward by a biasing force of a biasing member.
　In this case, since the side dam pull-up means is configured to be pulled by a biasing member such as a spring member, an electric system for operating is unnecessary, and the structure is simplified. The tension force can be set by adjusting the biasing force of the biasing member in advance.
[0018]
　The twin roll type continuous casting apparatus according to the present invention supplies the molten metal to the molten metal pool portion formed by the pair of rotating cooling rolls and the pair of side dams, and forms a solidified shell on the peripheral surface of the cooling roll. A twin roll type continuous casting apparatus for producing a thin cast piece by growing, characterized by comprising the above-mentioned side seal apparatus.
　According to the twin roll type continuous casting apparatus of this configuration, since the above-mentioned side sealing device is provided, it is possible to suppress the occurrence of a large gap between the end surface of the cooling roll and the contact surface of the side dam, and to perform thin wall casting. The piece can be manufactured stably.
[0019]
　The method for producing a thin cast piece according to the present invention, the molten metal is supplied to a molten metal pool portion formed by a pair of rotating cooling rolls and a pair of side dams, and a solidified shell is formed on the peripheral surface of the cooling roll. A method of manufacturing a thin cast product for growing a thin cast product, wherein the side seal device is used to press the side dam toward the end face of the cooling roll, and at least the side dam is vertical. The feature is that it is pulled upward in the direction.
[0020]
　According to the twin roll type continuous casting apparatus having this configuration, the side weir is pressed toward the end surface of the cooling roll and the side weir is pulled upward at least in the vertical direction by using the side seal device described above. Therefore, it is possible to suppress the positional deviation of the side weir, prevent the large gap between the end surface of the cooling roll and the contact surface of the side weir, and it is possible to stably manufacture the thin cast piece. ..
Effect of the invention
[0021]
　As described above, according to the present invention, the positional deviation of the side weir is suppressed, the increase in the gap between the contact surface of the side weir and the end surface of the cooling roll is suppressed, and stable thin wall casting is achieved. It is possible to provide a side seal device in a twin roll type continuous casting device capable of casting a piece, a twin roll type continuous casting device, and a method for manufacturing a thin cast piece.
Brief description of the drawings
[0022]
FIG. 1 is an explanatory view showing an example of a twin-roll type continuous casting apparatus used in the method for manufacturing a thin cast piece which is an embodiment of the present invention.
FIG. 2 is a partially enlarged explanatory view of the twin roll type continuous casting apparatus shown in FIG. 1.
FIG. 3 is an explanatory cross-sectional view of a side seal device that is an embodiment of the present invention.
FIG. 4 is an explanatory view of the side seal device according to the embodiment of the present invention as viewed from the side dam side.
FIG. 5 is an explanatory diagram of a side seal device that is another embodiment of the present invention.
FIG. 6 is an explanatory diagram of a side seal device that is another embodiment of the present invention.
FIG. 7 is an explanatory diagram of a side seal device that is another embodiment of the present invention.
FIG. 8 is an explanatory view of a side weir pulling means of the side seal device shown in FIG. 7.
FIG. 9 is an explanatory diagram showing measurement points of a vertical displacement amount and a horizontal displacement amount of the side dam in the example.
FIG. 10 is an explanatory diagram showing a positional deviation state of a side weir in a conventional side seal device.
MODE FOR CARRYING OUT THE INVENTION
[0023]
　Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following embodiments, the target metal to be cast will be described as steel. The present invention is not limited to the embodiments below.
　Here, examples of the steel type constituting the thin cast piece 1 manufactured in the present embodiment include 0.001 to 0.01% C ultra low carbon steel, 0.02 to 0.05% C low carbon steel, 2. 0.06 to 0.4% C medium carbon steel, 0.5 to 1.2% C high carbon steel, austenitic stainless steel typified by SUS304 steel, ferritic stainless steel typified by SUS430 steel, and 3. Examples include 0 to 3.5% Si grain-oriented electrical steel, 0.1 to 6.5% Si non-oriented electrical steel and the like (where% is% by mass).
　Further, in the present embodiment, the width of the thin cast piece 1 to be manufactured is within the range of 500 mm or more and 2000 mm or less, and the thickness is within the range of 1 mm or more and 5 mm or less.
[0024]
　A twin roll type continuous casting apparatus 10 used in the method for manufacturing a thin cast piece according to the present embodiment will be described with reference to FIGS. 1 to 4.
　The twin-roll type continuous casting apparatus 10 shown in FIG. It is defined by a pair of pinch rolls 13 and 13 to support, a side weir 15 disposed at the widthwise ends of the pair of cooling rolls 11 and 11, and a pair of the cooling rolls 11 and 11 and the side weir 15. A tundish 18 for holding the molten steel 3 supplied to the molten steel pool section 16 and a dipping nozzle 19 for supplying the molten steel 3 from the tundish 18 to the molten steel pool section 16 are provided.
[0025]
　In this twin roll type continuous casting apparatus 10, the molten steel 3 is brought into contact with the rotating cooling rolls 11 and to be cooled, so that the solidified shells 5 and 5 grow on the peripheral surfaces of the cooling rolls 11 and 11. The solidified shells 5, 5 respectively formed on the pair of cooling rolls 11, 11 are pressure-bonded to each other at the roll kiss points to cast the thin cast piece 1 having a predetermined thickness.
[0026]
　Here, as shown in FIG. 2, the molten steel pool portion 16 is defined by disposing the side dam 15 on the end surface of the cooling roll 11.
　As shown in FIG. 2, the molten steel pool portion 16 has a molten metal surface having a rectangular shape surrounded on four sides by the peripheral surfaces of the pair of cooling rolls 11 and the pair of side dams 15 and 15. An immersion nozzle 19 is arranged at the center of the molten metal surface.
[0027]
　As described above, the side weir 15 has a sealing action of slidingly contacting the end surface of the cooling roll 11 and preventing the molten steel 3 from leaking from the end of the cooling roll 11.
　It is important that the side dam 15 stably holds the molten steel 3 and does not adversely affect the formation of the solidified shell 5 on the peripheral surface of the cooling roll 11. Therefore, a heat-resistant material having a low reactivity with the molten steel 3 is used as a material forming the side dam 15, and, for example, graphite, boron nitride, aluminum nitride, silicon nitride, alumina, silica, or the like is used. Composite materials are used. In this embodiment, the side dam 15 made of boron nitride is used.
[0028]
　Then, as shown in FIG. 3, the side weir 15 is brought into contact with the end surface of the cooling roll 11 by the side sealing device 30.
　The side seal device 30 includes a side weir holder 31 that holds the side weir 15, a back plate 32 that is connected to the back side of the side weir holder 31, and a side that presses the side weir 15 toward the end surface of the cooling roll 11. The weir pushing means 35, the slide guide 36 for guiding the operation of the back plate 32, and the side weir pulling means 40 for pulling the side weir 15 at least upward are provided.
　Here, the side dam holder 31 and the back plate 32 are fastened together by a plurality of connecting members 33, as shown in FIG.
[0029]
　Further, as the above-mentioned side dam pressing means 35, for example, an existing pressing device such as a hydraulic cylinder can be used. In the present embodiment, as shown in FIG. 3, a hydraulic cylinder is used as the side dam pressing means 35. The side weir pressing means 35 may be one or plural.
　In the present embodiment, as shown in FIG. 4, two side weirs 15 and two side weir holders 31 are provided in the upper region, and one is provided in the lower region, for a total of three. The side dam pressing means 35 arranged in the lower region is located near the roll kiss point.
[0030]
　Further, as shown in FIG. 3, the slide guide 36 includes a guide bar 37 and a support cylinder portion 38 through which the guide bar 37 is inserted, and the slide guide 36 is guided by a ball housed inside the support cylinder portion 38. The bar 37 is supported.
　Here, as shown in FIG. 4, two slide guides 36 are arranged above and below the back plate 32.
[0031]
　The side weir pulling means 40 described above can use, for example, a hydraulic cylinder or the like. In the present embodiment, as shown in FIG. 3, a hydraulic cylinder is used as the side weir lifting means 40. The number of the side weir pulling means 40 may be one or plural.
　In the present embodiment, as shown in FIGS. 3 and 4, one side weir pulling means 40 is connected to the upper end surface of the back plate 32, and pulls the side weir 15 together with the back plate 32 vertically upward. Are arranged as follows. That is, in this embodiment, the side weir pulling means 40 is connected to a region above the center of gravity of the side weir 15.
[0032]
　Next, a method for manufacturing the thin cast piece 1 of the present embodiment using the twin roll type continuous casting apparatus 10 described above will be described.
[0033]
　The molten steel 3 is supplied from the tundish 18 through the immersion nozzle 19 to the molten steel pool portion 16 formed by the pair of cooling rolls 11, 11 and the side weir 15, and the pair of cooling rolls 11, 11 is rotated in the rotation direction R. The cooling rolls 11 and 11 are rotated toward each other, that is, so that the regions where the pair of cooling rolls 11 and 11 are close to each other are directed toward the drawing direction (downward in FIG. 1) of the thin cast piece 1.
　Then, the solidified shell 5 grows on the peripheral surface of the cooling roll 11, and the solidified shells 5 and 5 formed on the pair of cooling rolls 11 are pressed against each other at the roll kiss point, thereby reducing the thickness of the predetermined thickness. The slab 1 is cast.
[0034]
　Here, the side dam 15 is pressed against the end surface of the cooling roll 11 by the side dam pressing means 35 of the side seal device 30 described above, and the end surface of the cooling roll 11 and the contact surface of the side dam 15 are slidably contacted with each other to form the molten steel pool. The part 16 is sealed.
　At this time, the pressing force FP of the side weir 15 is usually within the range of 500 kgf or more and 2000 kgf or less (4903 N or more and 19613 N or less).
[0035]
　Further, the side dam 15 is pulled upward in the vertical direction by the side dam lifting means 40 of the side seal device 30 described above. As a result, the side weir 15 is prevented from being displaced downward with the rotation of the cooling roll 11.
　Here, the coefficient of friction μ between the end surface of the cooling roll 11 and the contact surface of the side dam 15 depends on the wear state of the side dam 15, the end surface shape of the cooling roll 11, and the like, but is usually 0.2 or more and 0.1. It is within the range of 7 or less.
[0036]
　Therefore, the downward force (pulling down force) FD acting on the side dam 15 with the rotation of the cooling roll 11 is FD=μ×FP. Here, the pulling down force FD is applied to the connecting member 33, the slide guide 36, the side dam pressing means 35, and the like, but the mechanical movement causes the side dam 15 to be displaced downward and cause a positional shift. It will be.
[0037]
　Here, in the present embodiment, in order to suppress the positional deviation of the side weir 15 by the side weir pulling means 40, the upward pulling force FU in the vertical direction is in the range of 10 kgf or more and 1500 kgf or less (98 N or more and 14709 N or less). It is set within.
　It should be noted that the necessary tensile force FU is preferably experimentally obtained in advance because external influences such as thermal expansion are applied during casting.
[0038]
　According to the twin roll type continuous casting device 10 and the side seal device 30 of the present embodiment configured as described above, the side dam raising means 40 for pulling the side dam 15 upward in the vertical direction is provided. Even if the side dam 15 is pressed toward the end surface of the cooling roll 11 by the side dam pressing means 35, the side dam 15 is prevented from being pulled down, and the positional displacement of the side dam 15 is suppressed. As a result, it is possible to suppress the formation of a large gap between the end surface of the cooling roll 11 and the contact surface of the side dam 15, and it is possible to stably manufacture the thin cast piece 1.
[0039]
　In particular, at the start of casting, the contact surface of the side weir 15 is not flat due to thermal expansion, so the friction coefficient between the end surface of the cooling roll 11 and the contact surface of the side weir 15 becomes large, and the positional deviation of the side weir 15 becomes large. Although it is likely to occur, in the present embodiment, since the side weir pulling means 40 is provided as described above, it is possible to suppress the positional deviation of the side weir 15 at the start of casting, and to stably start casting.
[0040]
　Further, in the present embodiment, the side weir pulling means 40 is connected to a region above the center of gravity of the side weir 15, and specifically, the side weir pulling means 40 is connected to the upper end surface of the back plate 32. Therefore, when the back plate 32 and the side weir 15 are pulled upward in the vertical direction by the side weir pulling means 40, the side weir 15 can be prevented from tilting, and the cooling roll 11 is provided in the lower region of the side weir 15. It is possible to suppress the formation of a large gap between the end surface of the side wall and the contact surface of the side dam 15.
[0041]
　Further, in the present embodiment, the vertical upward pulling force FU by the above-mentioned side weir pulling means 40 is set within the range of 10 kgf or more and 1500 kgf or less (98 N or more and 14709 N or less), so the side weir 15 is downward. It is suppressed that the side weir 15 is pulled down toward the front side, and the positional deviation of the side dam 15 can be appropriately suppressed. Thereby, casting can be stably started.
[0042]
　Further, in the present embodiment, as shown in FIG. 4, the side dam pressing means 35 are provided in the upper region of the side dam 15 and the side dam holder 31, two in total, and one in the lower region, for a total of three. Since the side weir pressing means 35 disposed in the lower region is located near the roll kiss point, the side weir 15 can be sufficiently pressed against the end surface of the cooling roll 11, and the molten steel pool portion 16 can be sufficiently secured. Can be sealed on.
[0043]
　Although the side seal device, the twin roll type continuous casting device, and the method for manufacturing a thin cast piece which are the embodiments of the present invention have been specifically described above, the present invention is not limited thereto and the technique of the invention. It can be changed as appropriate without departing from the spirit of thought.
　For example, in the present embodiment, as shown in FIG. 1, the twin roll type continuous casting apparatus in which the pinch rolls are arranged has been described as an example, but the arrangement of these rolls is not limited, and the design may be changed appropriately. May be.
[0044]
　Further, in the present embodiment, the side seal device is described as including three side dam pressing means, but the present invention is not limited to this, and there is no restriction on the configuration, number, and arrangement of the side dam pressing means. ..
　Furthermore, in the embodiment, the side seal device has been described as including two slide guides, but the present invention is not limited to this, and there is no limitation on the configuration, number, or arrangement of slide guides.
[0045]
　Further, in the present embodiment, as shown in FIGS. 3 and 4, one side weir pulling means 40 is connected to the upper end surface of the back plate 32, and the back plate is pulled upward in the vertical direction. However, the invention is not limited to this, and there is no limitation on the direction in which the side weir is pulled by the side weir pulling means as long as there is a component that pulls upward in the vertical direction.
　For example, like the side seal device 130 shown in FIG. 5, the back plate 32 may be pulled by two side dam pulling up means 140 connected to both ends of the upper end surface of the back plate 32 in the width direction. ..
[0046]
　Further, like the side seal device 230 shown in FIG. 6, the side dam pulling up means 240 connected to the upper end surface of the back plate 32 pulls the back plate 32 obliquely upward in the direction away from the end surface of the cooling roll 11. You may comprise. In this case, by pulling by the side weir pulling means 240, the lower end of the side weir 15 is pressed against the end surface of the cooling roll 11, and the generation of a gap between the side weir 15 and the cooling roll 11 is suppressed. You can
[0047]
　When the back plate 32 is pulled obliquely upward in the direction away from the end surface of the cooling roll 11 by the side weir pulling means 240, the horizontal component of the tensile force of the side weir pulling means 240 is It acts in the direction of separating the upper side of the side dam 15 from the cooling roll 11. Therefore, in order to surely press the upper side of the side weir 15 against the end surface of the cooling roll 11, the horizontal weir pressure of the side weir pulling-up means 240 is taken into consideration, and the side weir presser arranged in the upper region of the side weir 15 is pressed. It is preferable to set the pressing force in the means 35.
[0048]
　Furthermore, in the present embodiment, the side dam pulling means 40 is connected to the upper end of the back plate 32 that supports the side dam 15, but the present invention is not limited to this, and the side seal device shown in FIG. Like 330, the side weir pulling means 340 is provided independently of the supporting member (the back plate 32 and the side weir holder 31) that supports the side weir 15, and the side weir pushing means 35 moves the side weir 15 to the side weir 15. The support member (the back plate 32 and the side dam holder 31) that supports the side dam 15 and the side dam pull-up means 340 may be configured to engage with each other when pressed against the end surface of the cooling roll 11. The upper side of FIG. 7 is a top view and the lower side is a side view. In the side seal device 330 of FIG. 7, as shown in the top view, two side weir pulling means 340 are arranged in the width direction of the side weir 15.
[0049]
　Before the start of casting, the side weir 15 is preheated by the preheating device 350 in a state of being separated from the cooling roll 11, as shown in FIG. In this state, the side weir pulling means 340 is not engaged with the supporting member (the back plate 32 and the side weir holder 31) that supports the side weir 15.
　Then, as shown in FIG. 7B, when the side weir 15 is pressed against the end surface of the cooling roll 11 at the start of casting, the side weir pulling-up means 340 supports the side weir 15 (back plate 32). And the side weir holder 31) is engaged, and the side weir 15 is pulled upward in the vertical direction.
[0050]
　In the side seal device 330 shown in FIG. 7, the side weir pulling means 340 is fixed to the frame 39 located above the side weir holder 31, and is arranged on the frame 39 as shown in FIG. Spring member 341, a pressing member 342 disposed on the upper side of the spring member 341, a rod 343 which is inserted into the spring member 341 and the pressing member 342, and protrudes to the lower side of the frame 39, and an upper end side of the rod 343. And an adjusting nut 344 for adjusting the biasing force of the spring member 341 by pressing the pressing member 342 downward. An engagement roller 345 is arranged at the lower end of the rod 343.
[0051]
　On the other hand, as shown in FIG. 7, on the upper end side of the side dam holder 31, an engagement claw portion 31 a that engages with the engagement roller 345 of the side dam lifting means 340 is provided. The engaging claw portion 31a has a tip end portion (end portion on the cooling roll side) that is an inclined surface that retreats toward the base end side as it goes downward. When the side dam 15 is pressed against the end surface of the cooling roll 11, the engaging claw portion 31 a engages with the engaging roller 345 provided at the lower end of the rod 343.
[0052]
　Here, in a state where the side dam 15 is separated from the cooling roll 11, the height of the upper end of the engaging roller 345 is lower than the upper surface of the engaging claw portion 31a and higher than the lower surface of the engaging claw portion 31a. Set to the position. Therefore, when the side dam 15 is pressed against the end surface of the cooling roll 11, the engagement roller 345 and the rod 343 are displaced downward along the inclined surface of the tip end portion of the engagement claw portion 31a. As a result, the spring member 341 contracts, and the side dam holder 31 is pulled upward in the vertical direction by the restoring force (biasing force) of the spring member 341.
[0053]
　In the side seal device 330 having such a configuration, when the side weir 15 is pressed against the end surface of the cooling roll 11, the side weir pulling-up means 340 supports the side weir 15 (the back plate 32 and the side weir). Since it is configured to engage with the holder 31), it is not necessary to move the side dam pulling up means 340 together with the support member (the back plate 32 and the side dam holder 31) of the side dam 15 at the start of casting.
　Further, since the side weir pulling means 340 is provided with the spring member 341, an electric system for operating is unnecessary, and the structure is simplified.
Example
[0054]
　Below, the results of experiments conducted to confirm the effects of the present invention will be described.
[0055]
(Example 1)
　First, using the twin roll type continuous casting apparatus 10 and the side seal apparatus 30 described in the present embodiment, the displacement amount of the side weir 15 was measured without using molten steel, and it is shown in FIG. Displacement meters S1 and S2 were installed at the positions, and the displacement in the horizontal direction (pressing direction) and the displacement in the vertical direction of the upper end of the side dam holder 31 holding the side dam 15 were measured.
[0056]
　With the side dam 15 made of boron nitride heated to 1250° C., two side dam pressing means 35 arranged in the upper region are pressed against the end surface of the Cu sleeve Ni-plated cooling roll 11 having a diameter of 1000 mm and a width of 1000 mm. The force was 100 kgf, and the pressing force of one side dam pressing means 35 arranged in the lower region was 400 kgf. The total pressure was 600 kgf, and the cooling roll 11 was rotated at a speed of 20 mpm.
[0057]
　Here, as Example 1 of the present invention, the side weir pulling means 40 pulled up the side weir 15 vertically upward with a thrust of 100 kgf. In Comparative Example 1, the side weir pulling means 40 did not pull up.
　Then, the amount of horizontal displacement and the amount of vertical displacement 30 seconds after the start of sliding were measured. The evaluation results are shown in Table 1.
[0058]
[table 1]

[0059]
　In Comparative Example 1, the side weir 15 had a horizontal displacement amount of 2.4 mm and a vertical displacement amount of 3.9 mm.
　In Comparative Example 1, as shown in FIG. 10A, no gap is formed between the side weir 15 and the end surface of the cooling roll 11 when the side weir 15 is in contact. Then, after the sliding time with the cooling roll 11 elapses, the side dam 15 is displaced downward and the upper end of the side dam 15 falls toward the end face side of the cooling roll 11 as shown in FIG. 10B. It was displaced, and at the lower end of the side dam 15, a gap was created between the end surface of the cooling roll 11 and the contact surface of the side dam 15.
[0060]
　On the other hand, in Example 1 of the present invention in which the side dam 15 is pulled vertically upward by the side dam pulling means 40, the horizontal displacement amount of the side weir 15 is 0.2 mm and the vertical displacement amount is 0.0 mm. Became. It was confirmed that the positional deviation of the side dam 15 was sufficiently suppressed.
[0061]
(Example 2)
　Next, the thin cast piece 1 of steel was manufactured using the twin roll type continuous casting apparatus 10 and the side seal devices 30 and 330 described in the present embodiment. Incidentally. The composition of this thin cast piece was 0.05% C, 0.6% Si, 1.5% Mn, 0.03% Al, the balance Fe and impurities in terms of mass %.
　With a Cu sleeve Ni plating cooling roll 11 having a diameter of 1000 mm and a width of 1000 mm, a thin cast piece 1 having a plate thickness of 2.0 mm was cast at a casting speed of 50 mpm.
[0062]
　With the side dam 15 made of boron nitride heated to 1250° C., two side dam pressing means 35 arranged in the upper region are pressed against the end surface of the Cu sleeve Ni-plated cooling roll 11 having a diameter of 1000 mm and a width of 1000 mm. The force was set to 100 kgf, and the pressing force of the side dam pressing means 35 arranged in the lower region was set to 400 kgf, and the total pressure was 600 kgf.
[0063]
　Here, as Example 2 of the present invention, the side weir pulling means 40 pulled up the side weir 15 vertically upward while changing the thrust from 20 kgf to 400 kgf.
　In addition, as Example 3 of the present invention, the side weir 15 was pulled up vertically by the side weir pulling means 340 shown in FIGS. 7 and 8. At this time, the spring member was arranged so that the pulling force by one side weir pulling means 340 would be 200 kgf.
　In Comparative Example 2, the side weir pulling means 40 did not pull up.
　Table 2 shows the evaluation results obtained by evaluating the casting conditions and the side weir wear conditions after casting.
[0064]
[Table 2]

[0065]
　In Comparative Example 2, the molten steel leaked from below the side dam after the start of casting, and the degree gradually became severe, so that the casting was stopped. After casting, on the surface of the side weir, a groove was found in an area above 25 mm above the roll kiss point, but there was no groove in an area below that. The maximum depth of the groove was 0.3 mm, and a gap of at least 0.3 mm was present between the side dam surface and the roll end surface.
[0066]
　On the other hand, in Inventive Example 2, the casting could be stably continued in the pulling force range of 20 kgf to 400 kgf. After casting, a groove in which the shape of the roll end face was engraved was found on the surface of the side dam. The depth of the groove was within the range of 0.7 to 1.1 mm on the entire surface. It is presumed that this is because the positional deviation of the side weir 15 was suppressed and the same portion slidably contacted the end surface of the cooling roll 11.
　Further, also in Inventive Example 3, casting could be continued stably. After casting, a groove in which the shape of the roll end face was engraved was found on the surface of the side dam. The depth of the groove was within the range of 0.8 to 1.2 mm on the entire surface.
[0067]
　As described above, according to the example of the present invention, the positional deviation of the side weir is suppressed, it is possible to suppress the formation of a large gap between the end surface of the cooling roll and the contact surface of the side weir, and stable casting is possible. It was confirmed that it could be implemented.
Industrial availability
[0068]
　Advantageous Effects of Invention According to the present invention, it is possible to suppress the positional deviation of the side weir, suppress an increase in the gap between the contact surface of the side weir and the end surface of the cooling roll, and stably cast a thin cast piece. It is possible to provide a side seal device in a twin roll type continuous casting device, a twin roll type continuous casting device, and a method for manufacturing a thin cast piece capable of performing the above.
Explanation of symbols
[0069]
1 Thin-walled slab
3 Molten steel
5 Solidified shell
11 Cooling roll
15 Side weir
16 Molten steel pool part (molten metal pool part)
30, 130, 230, 330 Side seal device
35 Side weir pressing means
40, 140, 240, 340 Side weir pull up means
The scope of the claims
[Claim 1]
　A molten metal is supplied through a dipping nozzle to a molten metal pool portion formed by a pair of rotating cooling rolls and a pair of side dams, a solidified shell is formed and grown on the peripheral surface of the cooling roll, and a thin cast piece is formed. A twin roll type continuous casting apparatus for producing a side seal device for sealing
　the end surface side of the cooling roll with the side dam, and a side dam pressing means for pressing the side dam toward the end surface of the cooling roll. And a
　side weir pulling means for pulling the side weir at least vertically upward
.
[Claim 2]
　The side seal device according to claim 1, wherein the side weir pulling means is connected to a region above the center of gravity of the side weir.
[Claim 3]
　The side weir pulling means engages with the side weir or a supporting member that supports the side weir when the side weir pushing means presses the side weir against the end surface of the cooling roll, and the side weir is at least vertical. The side seal device according to claim 1 or 2, wherein the side seal device is configured to be pulled upward in the direction.
[Claim 4]
　4. The side according to any one of claims 1 to 3, wherein the side weir pulling means is configured by a cylinder that pulls the side weir upward at least in the vertical direction by the pressure of fluid. Sealing device.
[Claim 5]
　4. The side weir pulling means is configured to pull the side weir at least vertically upward by an urging force of an urging member. Side seal device.
[Claim 6]
　A twin roll type that supplies a molten metal to a molten metal pool portion formed by a pair of rotating cooling rolls and a pair of side dams to form and grow a solidified shell on the peripheral surface of the cooling roll to produce a thin cast piece. a continuous casting apparatus,
　twin-roll continuous casting apparatus, characterized in that it comprises a side seal device according to any one of claims 1 to 5.
[Claim 7]
　A thin cast piece for producing a thin cast piece by supplying a molten metal to a molten metal pool portion formed by a pair of rotating cooling rolls and a pair of side dams to form and grow a solidified shell on the peripheral surface of the cooling roll. A method for manufacturing the
　same, wherein the side weir is pressed toward the end face of the cooling roll by using the side seal device according to any one of claims 1 to 5, and at least the side weir is provided. A method of manufacturing a thin cast slab, which comprises pulling vertically upward.