Hot-rolled steel strip manufacturing apparatus and hot-rolled steel strip manufacturing method

Abstract

To provide a manufacturing device of a hot-rolled steel strip capable of realizing effective dewatering, and a manufacturing method of a hot-rolled steel strip.SOLUTION: A manufacturing device of a hot-rolled steel strip includes: an injection part for injecting fluid for dewatering cooling water which has been used for a hot-rolled steel strip; and a side guide which is provided at a position facing the injection part in a plate width direction of the steel strip, and which inclines in a direction of separating from a steel strip relative to a vertical direction, increasingly towards a lower part in the vertical direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a hot-rolled steel strip manufacturing apparatus and a hot-rolled steel strip manufacturing method. [Background technology]

[0002] The hot-rolled steel strip after finish rolling in the hot rolling process is cooled to a predetermined temperature by cooling devices provided above and below the run-out table while being transported by a run-out table from the finishing mill to a coiling device, and then wound onto the coiling device. In the hot rolling of the hot-rolled steel strip, the cooling history after this finish rolling is an important factor that determines the mechanical properties of the hot-rolled steel strip, such as strength, ductility, and toughness, as well as material properties such as formability and weldability, and therefore it is important to cool the hot-rolled steel strip uniformly to a predetermined temperature.

[0003] In the cooling process after this finish rolling, the hot rolled steel strip is usually cooled using, for example, water (hereinafter referred to as cooling water) as a cooling medium. Specifically, the hot rolled steel strip is cooled using cooling water in a cooling zone for obtaining a predetermined cooling history for building the material properties of the hot rolled steel strip. In order to uniformly cool the hot rolled steel strip to a predetermined temperature as described above, it is necessary to prevent excess cooling water from flowing out of areas other than this cooling zone.

[0004] Therefore, the excess cooling water on the hot rolled steel strip that has flowed out of the cooling zone (hereinafter also referred to as "on-plate water") is drained off (i.e., the cooling water is discharged from the surface of the hot rolled steel strip). As a method for draining the cooling water, for example, Patent Document 1 describes a technology in which a draining fluid is sprayed onto the cooling water to remove the cooling water remaining on the steel strip surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3970509 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the technique described in Patent Document 1 has the problem that some of the cooling water may remain on the steel strip, and there is still room for improvement in terms of effectively removing the cooling water.

[0007] Therefore, the present invention has been made in consideration of the above problems, and an object of the present invention is to provide a hot-rolled steel strip manufacturing apparatus and a hot-rolled steel strip manufacturing method that can achieve more effective drainage. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, according to one aspect of the present invention, a hot rolled steel strip is provided with a jetting section that jets a fluid for draining off the cooling water used for the hot rolled steel strip, and a side guide that is provided at a position opposite to the jetting section in the width direction of the steel strip and is inclined in a direction away from the steel strip with respect to the vertical direction as it goes downward in the vertical direction. An apparatus for producing hot rolled steel strip is provided.

[0009] The opposing position may be a position that includes a predetermined range of angles from the ejection direction of the fluid.

[0010] The predetermined angle may be determined by the following formula (1). α=arctan(p1 / p2) (1) where α is the predetermined angle p1: Momentum of the cooling water moving with the steel strip p2: Momentum of the above fluid

[0011] The side guide may be inclined in a direction away from the steel strip relative to the conveying direction as it moves upstream in the conveying direction of the steel strip.

[0012] The side guide may be inclined in a direction away from the steel strip as it moves downward in the vertical direction on the upstream side of the conveying direction of the steel strip, and may be aligned in the vertical direction on the downstream side of the conveying direction.

[0013] In order to solve the above problem, according to another aspect of the present invention, there is provided a method for manufacturing a hot-rolled steel strip, which includes injecting a fluid to drain off used cooling water onto a hot-rolled steel strip, and discharging the cooling water through a side guide that is located at a position opposite the position where the fluid is injected in the width direction of the steel strip and that is inclined in a direction away from the steel strip as it goes downward in the vertical direction. [Effects of the Invention]

[0014] As described above, according to the present invention, a hot-rolled steel strip manufacturing apparatus and a hot-rolled steel strip manufacturing method that can realize more effective draining are provided. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing an example of a schematic configuration of a hot-rolled steel strip manufacturing apparatus according to a first embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view showing an example of a schematic configuration of a cooling device and a draining device according to the prior art. [Figure 3] 1 is a perspective view showing an example of a schematic configuration of a cooling device and a draining device according to a first embodiment of the present invention. [Figure 4] 1 is a plan view showing an example of a schematic configuration of a side guide according to a first embodiment of the present invention. [Figure 5] FIG. 3 is a conceptual diagram for explaining a predetermined angle according to the first embodiment of the present invention. [Figure 6] 1 is a perspective view showing an example of a schematic configuration of a side guide according to a first embodiment of the present invention. [Figure 7] 1 is a flowchart showing an example of a manufacturing process of a hot-rolled steel strip according to a first embodiment of the present invention. [Figure 8]FIG. 10 is a plan view showing an example of a schematic configuration of a side guide according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view showing an example of a schematic configuration of a side guide according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a plan view showing an example of a schematic configuration of a side guide according to a third embodiment of the present invention. [Figure 11] FIG. 10 is a perspective view showing an example of a schematic configuration of a side guide according to a third embodiment of the present invention. [Figure 12] FIG. 11 is a plan view showing an example of a schematic configuration of a side guide according to a modified example of the third embodiment of the present invention. [Figure 13] FIG. 11 is a perspective view showing an example of a schematic configuration of a side guide according to a modified example of the third embodiment of the present invention. [Figure 14] 10 is a graph showing the comparison results of the amount of water on the plate according to the examples of the present invention. [Figure 15] FIG. 10 is a plan view showing an example of a schematic configuration of a side guide according to a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0017] First Embodiment First, the schematic configuration of a hot-rolled steel strip manufacturing apparatus 10 according to a first embodiment of the present invention will be described with reference to Figures 1 to 6. Figure 1 is a diagram showing the schematic configuration of the hot-rolled steel strip manufacturing apparatus 10.

[0018] In the hot-rolled steel strip manufacturing apparatus 10, a heated slab is sandwiched between rolls and continuously rolled, for example, to a thickness of 1 mm, and the hot-rolled steel strip 1 (hereinafter simply referred to as "steel strip 1") is wound up. The hot-rolled steel strip manufacturing apparatus 10 includes a heating furnace (not shown) for heating the slab, a width direction rolling mill (not shown) that rolls the slab heated in the heating furnace in the width direction, and a roughing mill (not shown) that rolls the slab rolled in the width direction from above and below to form a rough bar.

[0019] As shown in Figure 1, the hot-rolled steel strip manufacturing apparatus 10 includes a finishing mill 14 that continuously hot-finish-rolls the rough bar to a predetermined thickness, a cooling device 15 that cools the steel strip 1 that has been hot-finish-rolled by the finishing mill 14 with cooling water W, a draining device 16 that drains the cooling water sprayed from the cooling device 15, and a winding device 17 that winds up the steel strip 1 that has been cooled by the cooling device 15 into a coil.

[0020] The finishing mills 14 finish-roll the conveyed rough bars to a thickness of about several mm. These finishing mills 14 pass the rough bars through gaps between finishing rolls 14a arranged in a straight line above and below across 6 to 7 stands, gradually reducing the thickness. The steel strip 1 that has been finish-rolled to a predetermined thickness by this finishing mill 14 is transported by transport rolls 18 and sent to a cooling device 15.

[0021] The cooling device 15 is equipment that cools the steel strip 1 with cooling water W. The cooling device 15 is, for example, a pipe laminar nozzle type cooling device. That is, the cooling water W is supplied to the steel strip 1 from pipe laminar nozzles that are arranged in multiple rows along the conveying direction of the steel strip 1 (i.e., the Y direction shown in Figure 1) and in multiple rows along the width direction of the steel strip 1 (i.e., the X direction shown in Figure 1). However, the cooling method is not limited to this, and for example, a spray nozzle type cooling device may also be used.

[0022] The water draining device 16 is a device that sprays a fluid F onto the surface of the steel strip 1 to drain the cooling water W. The water draining device 16 is equipped with a water draining nozzle 16a. When the fluid F is sprayed from the water draining nozzle 16a, the cooling water W that has accumulated on the surface of the steel strip 1 is discharged outside the surface of the steel strip 1. Specifically, when the fluid F sprayed at a predetermined pressure and flow rate collides with the cooling water W, the cooling water W is forced to flow away from the surface of the steel strip 1 in the strip width direction. As a result, the cooling water W is discharged from the surface of the steel strip 1. The fluid F may be, for example, water, or a mixed fluid consisting of air and water. The pressure and flow rate at which the fluid F is sprayed are set appropriately depending on the flow rate of the cooling water W, etc.

[0023] The coiling device 17 coils the steel strip 1 cooled by the cooling device 15 at a predetermined coiling temperature. The steel strip 1 wound into a coil by the coiling device 17 is transported from the hot-rolled steel strip manufacturing apparatus 10 to the next process. The hot-rolled steel strip manufacturing apparatus 10 has been described above.

[0024] Here, when the steel strip 1 is transported, the steel strip 1 may meander (i.e., move in the strip width direction WD) due to changes in the tension generated in the steel strip 1 or changes in the transport speed of the steel strip 1. To prevent excessive movement in the strip width direction WD due to this meandering, the hot-rolled steel strip manufacturing apparatus 10 is provided with a side guide 19, as shown in FIG. 2. The side guide 19 is a plate-shaped member provided near the axial end 18a of the transport roll 18. The side guide 19 is arranged so that its thickness direction is aligned with the strip width direction WD of the steel strip 1. In other words, the side guide 19 is arranged so that a plane normal to the thickness direction faces the end face of the strip width direction WD of the steel strip 1. Here, consider a flat side guide having a longitudinal direction along the transport direction TD, such as the side guide 19 according to the prior art shown in FIG. 2. Since the side guides 19 are continuous along the conveying direction TD, some of the cooling water W that moves in the strip width direction WD by the water draining is discharged through the gaps between the conveying rolls 18, but the rest collides with the side guides 19. The side guides 19 are arranged so that their strip width direction is vertical. Therefore, most of the cooling water W is reflected by the side guides 19 and returns to the surface of the steel strip 1. As a result, excessive cooling occurs outside the cooling area, which may affect the material properties of the steel strip 1.

[0025] Therefore, the hot-rolled steel strip manufacturing apparatus 10 according to this embodiment is provided with a side guide section 100, as shown in FIG. 3. The side guide section 100 includes a first side guide 101 and a second side guide 102. As shown in FIGS. 3 and 4, the first side guide 101 is provided in a position opposite the drain nozzle 16a in the width direction WD of the steel strip 1 (i.e., the X direction shown in the figures). The first side guide 101 is a plate-shaped member, and is arranged with its surface, normal to the thickness direction, facing the steel strip 1. The first side guide 101 is provided near the axial end 18a of the transport roll 18.

[0026] As shown in Figure 3, the first side guide 101 is inclined in a direction away from the steel strip 1 relative to the vertical direction (i.e., the Z direction shown in Figure 3) as it goes downward in the vertical direction. In other words, the distance between the first side guide 101 and the axial end 18a of the conveying roll 18 becomes wider as it goes downward in the vertical direction. The inclination angle of the first side guide 101 is not particularly limited and is set within a range that enables the first side guide 101 to discharge the cooling water W while preventing the steel strip 1 from meandering. In addition, the upper edge 111 of the first side guide 101 is arranged so as to be on an extension of the area other than the upstream end 102a of the second side guide 102 in the conveying direction TD.

[0027] The second side guide 102 is a plate-like member and is arranged with its surface, normal to the plate thickness direction, facing the steel strip 1. The second side guide 102 is provided near the axial end 18a of the transport roll 18 other than the position where the first side guide 101 is provided. In the example shown in Figure 3, multiple second side guides 102 are provided. The multiple second side guides 102 are provided corresponding to each of the multiple transport rolls 18.

[0028] As shown in Figure 4, when the second side guide 102 is viewed from above, the upstream end 102a of the second side guide 102 in the conveying direction TD is inclined in a direction away from the steel strip 1 with respect to the conveying direction TD. By having the upstream end 102a of the second side guide 102 in the conveying direction TD inclined in a direction away from the steel strip 1, the cooling water W is more easily discharged. Note that the configuration in which multiple second side guides 102 are provided as shown in Figures 3 and 4 is merely an example, and the second side guides 102 may be continuous along the conveying direction TD or may be provided across multiple conveying rolls 18. Furthermore, the upstream end 102a of the second side guide 102 may have a shape that is not separated from the steel strip 1 in the conveying direction TD (i.e., a flat plate shape).

[0029] As shown in FIG. 4, the first side guide 101 is positioned opposite the drain nozzle 16a. Here, the "opposing position" refers to a position within a predetermined angle range from the direction of spraying of the fluid F from the drain nozzle 16a. Specifically, in a plan view of the steel strip 1 (i.e., a vertical view), a line along the direction of spraying of the fluid F from the drain nozzle 16a is defined as an imaginary line L1. Also, in a plan view of the steel strip 1, a line forming a predetermined angle α with the imaginary line L1 and inclined downstream in the conveying direction TD with respect to the strip width direction WD is defined as an imaginary line L2. The starting point of the imaginary line L2 is the position where draining of the steel strip 1 begins (i.e., the position where the fluid F begins to contact the steel strip 1). The draining start position is, for example, the center of the steel strip 1 in the strip width direction WD. The "opposing position" refers to the area sandwiched between the imaginary lines L1 and L2 near the axial end 18a of the conveying roll 18 where the side guide unit 100 is installed.

[0030] Here, the predetermined angle α is expressed by the following equation (1). α=arctan(p1 / p2) (1) where α is the predetermined angle p1: Momentum of cooling water W moving with steel strip 1 p2: Momentum of the fluid F injected from the drain nozzle 16a

[0031] The momentum p1 of the cooling water W moving together with the steel strip 1 is the product of the flow rate of the cooling water W and the moving speed of the cooling water W moving on the surface of the steel strip 1. Here, the moving speed of the cooling water W can be estimated, for example, as half the conveying speed of the steel strip 1. Furthermore, when two drain nozzles 16a are used to drain the steel strip 1 from both sides, the flow rate of the cooling water W can be estimated as half the cooling water W on the steel strip 1. Furthermore, the momentum p2 of the fluid F sprayed from the drain nozzle 16a is the product of the flow rate of the fluid F and the spray speed of the fluid F. An example of the fluid spray speed is 20 m / s.

[0032] The change in the moving direction of the cooling water W during draining will be explained below with reference to Figure 5. Note that in the following explanation, draining is performed from both sides of the steel strip 1 as shown in Figures 3 and 4, but this is merely an example. Draining may also be performed from one side of the steel strip 1. As shown in Figure 5, the predetermined angle α corresponds to the range of change in the moving direction of the cooling water W drained by the fluid F. The cooling water W moves on the steel strip 1 at a certain speed (e.g., 1.5 m / s) together with the steel strip 1. The cooling water W is then drained by the fluid F sprayed from the drain nozzle 16a. Here, it is assumed that the fluid F is sprayed from the drain nozzle 16a along the strip width direction WD. As a result, the cooling water W on the steel strip 1 acquires momentum represented by a momentum vector Vp3, which is a resultant vector of the momentum vector Vp1 associated with the movement of the steel strip 1 and the momentum vector Vp2 associated with the spray of the fluid F. 5, the angle formed by the momentum vector Vp3 and the momentum vector Vp1 is the angle α expressed by the above formula (1). That is, the direction of movement of the cooling water W changes within a predetermined angle α from the spray direction of the fluid F due to the drainage.

[0033] For example, the momentum p1 of the cooling water W moving with the steel strip 1 is assumed to be 250 L / min (assumed to be half the amount of cooling water W on the steel strip 1) x 1.5 m / s (flow velocity at the start of draining). Also, the momentum p2 of the fluid F is assumed to be 80 L / min x 20 m / s. In this case, the direction (α) of the combined momentum is 13°. Therefore, the range of change in the direction of movement of the cooling water W due to draining is considered to be a range that extends downstream by α = 13°.

[0034] As shown in Figure 6, the cooling water W is drained by the fluid F sprayed from the drain nozzle 16a (see Figures 3 and 4). Specifically, the cooling water W moves toward the end of the steel strip 1 in the strip width direction WD due to the spraying of the fluid F. Furthermore, a portion of the cooling water W collides with the first side guide 101. At this time, the first side guide 101 is inclined in a direction away from the steel strip 1 with respect to the vertical direction as it goes downward in the vertical direction. Therefore, the cooling water W that collides with the first side guide 101 changes its moving direction vertically downward (see arrow A in the figure). In other words, after colliding with the first side guide 101, most of the cooling water W is discharged vertically downward. In this way, the cooling water W is discharged from above the surface of the steel strip 1.

[0035] Next, a manufacturing method of a hot-rolled steel strip 1 according to this embodiment will be described with reference to FIG. 7. FIG. 7 is a flowchart illustrating a portion of the manufacturing process of a hot-rolled steel strip 1 according to this embodiment. As shown in FIG. 7, first, in step ST10, a fluid F is sprayed to drain off the cooling water W remaining on the surface of the steel strip 1. After step ST10 is performed, the manufacturing process proceeds to step ST12. In step ST12, the fluid F sprayed in step ST10 moves the cooling water W on the surface of the steel strip 1 toward the end of the steel strip 1 in the strip width direction WD. The cooling water W is then discharged via the first side guide 101. As described above, the first side guide 101 is inclined in a direction away from the steel strip 1 with respect to the vertical direction as it goes downward in the vertical direction. Therefore, most of the cooling water W is discharged downward in the vertical direction. After step ST12 is performed, a portion of the manufacturing process of a hot-rolled steel strip 1 according to this embodiment is completed.

[0036] As described above, the hot-rolled steel strip manufacturing apparatus 10 according to the first embodiment is provided with a first side guide 101 that is positioned opposite the drain nozzle 16a in the width direction WD of the steel strip 1 and that is inclined in a direction away from the steel strip 1 relative to the vertical direction as it moves downward in the vertical direction. As a result, after the cooling water W drained by the injection of the fluid F collides with the first side guide 101, most of it is discharged downward in the vertical direction. As a result, more effective draining of the cooling water W accumulating on the surface of the steel strip 1 is achieved.

[0037] That is, when the side guides 19 are arranged vertically as in the case of the side guides 19 shown in FIG. 2, most of the cooling water W that collides with the side guides 19 returns to the surface of the steel strip 1, which can result in insufficient draining. In the hot-rolled steel strip manufacturing apparatus 10 according to this embodiment, the cooling water W that has been drained by the injection of the fluid F is discharged vertically downward after colliding with the first side guide 101. This prevents the cooling water W from returning to the surface of the steel strip 1. As a result, more effective draining is achieved for the cooling water W that remains on the surface of the steel strip 1.

[0038] Furthermore, in the hot-rolled steel strip manufacturing apparatus 10 according to the first embodiment, the first side guide 101 is positioned opposite the drain nozzle 16a. The position opposite the drain nozzle 16a is a position that is within a predetermined angular range from the spray direction of the fluid F. That is, a line along the direction in which the fluid F is sprayed from the drain nozzle 16a is defined as a virtual line L1. Similarly, in a plan view of the steel strip 1, a line that forms a predetermined angle α with the virtual line L1 and is inclined downstream in the conveying direction TD with respect to the strip width direction WD is defined as a virtual line L2. In this case, the opposing position is within the range defined by the predetermined angle α. Therefore, according to this configuration, the first side guide 101 is positioned within a sufficient range relative to the spray direction of the fluid F, thereby effectively discharging the cooling water W and suppressing meandering of the steel strip 1 as a side guide unit 100.

[0039] Furthermore, in the hot-rolled steel strip manufacturing apparatus 10 according to this embodiment, the predetermined angle α is determined by the above formula (1). The above formula (1) is an equation that takes into account the momentum p1 of the cooling water W and the momentum p2 of the fluid F. Therefore, according to this configuration, the predetermined angle α is set within an appropriate range in relation to the momentum of the cooling water W and the fluid F, so that the cooling water W can be effectively discharged and meandering of the steel strip 1 can be suppressed as a side guide section 100.

[0040] That is, when the cooling water W remaining on the steel strip 1 is drained by the fluid F, the direction of movement of the cooling water W changes. In other words, as the cooling water W is drained, the range of the direction of movement of the cooling water W expands to the direction of the combined momentum of the cooling water W and the momentum of the fluid F. In the hot-rolled steel strip manufacturing apparatus 10 according to this embodiment, the first side guide 101 is arranged within a range defined by the predetermined angle α, so that the cooling water W whose direction of movement has changed can be effectively discharged.

[0041] <Second embodiment> Next, a hot-rolled steel strip manufacturing apparatus 10 according to a second embodiment of the present invention will be described with reference to Figures 8 and 9. In the hot-rolled steel strip manufacturing apparatus 10 according to the first embodiment, the first side guide 101 is inclined with respect to the vertical direction. However, the first side guide 101A according to this second embodiment is inclined not only with respect to the vertical direction but also with respect to the conveying direction TD as a whole when the steel strip 1 is viewed in plan. In the description of this second embodiment, a description of the configuration common to the first embodiment will be omitted.

[0042] As shown in Figure 8, the first side guide 101A according to this second embodiment is inclined in a direction away from the steel strip 1 with respect to the conveying direction TD of the steel strip 1 as it moves upstream in the conveying direction TD of the steel strip 1. In other words, the distance between the first side guide 101A and the axial end 18a of the conveying roll 18 becomes wider as it moves upstream in the conveying direction TD. In addition, the downstream end 111A of the upper edge 111 of the first side guide 101A is positioned so as to be on an extension of the portion of the second side guide 102 other than the upstream end 102a in the conveying direction TD.

[0043] The angle β of the first side guide 101A relative to the conveying direction TD is not particularly limited, and is set within a range that allows the first side guide 101A to discharge the cooling water W and does not deviate from the purpose of suppressing meandering of the steel strip 1. For example, the angle β is set based on the results of a fluid simulation regarding the discharge of the cooling water W or the results of a test using an actual machine.

[0044] The first side guide 101A is inclined in a direction away from the steel strip 1 with respect to the vertical direction as it goes downward in the vertical direction. Furthermore, the first side guide 101A is provided at a position facing the drain nozzle 16a. Here, the facing position is a position that includes a range of a predetermined angle from the spray direction of the fluid F sprayed from the drain nozzle 16a. The predetermined angle α is calculated using the above formula (1).

[0045] As shown in Figure 9, the cooling water W is drained by the fluid F sprayed from the drain nozzle 16a. Specifically, the cooling water W moves toward the end of the steel strip 1 in the strip width direction WD due to the spraying of the fluid F. Furthermore, a portion of the cooling water W collides with the first side guide 101A. The first side guide 101A is inclined in a direction away from the steel strip 1 with respect to the conveying direction TD as it moves upstream in the conveying direction TD of the steel strip 1. Therefore, a portion of the cooling water W that collides with the first side guide 101A changes its moving direction toward the upstream side in the conveying direction TD (see arrow B in the figure). In other words, after colliding with the first side guide 101A, a portion of the cooling water W is discharged toward the upstream side in the conveying direction TD. In this way, the cooling water W is discharged from above the surface of the steel strip 1.

[0046] Furthermore, the first side guide 101A is inclined in a direction away from the steel strip 1 with respect to the vertical direction as it goes vertically downward. Therefore, a portion of the cooling water W that collides with the first side guide 101A changes its moving direction vertically downward (see arrow A in the figure). In other words, after colliding with the first side guide 101A, a portion of the cooling water W is discharged vertically downward. In this way, the cooling water W is discharged from above the surface of the steel strip 1.

[0047] As described above, in the hot-rolled steel strip manufacturing apparatus 10 according to the second embodiment, the first side guide 101A is inclined away from the steel strip 1 with respect to the conveying direction TD as it moves upstream in the conveying direction TD of the steel strip 1. Therefore, according to this configuration, a portion of the cooling water W drained by the injection of the fluid F collides with the first side guide 101A at an angle greater than 90 degrees in a plan view of the steel strip 1. That is, there is a region in the first side guide 101A where the collision angle of the cooling water W with the first side guide 101A is greater than 90 degrees. As a result, after colliding with the first side guide 101A, a portion of the cooling water W is discharged toward the upstream side in the conveying direction TD. This prevents the cooling water W from returning to the surface of the steel strip 1. As a result, more effective draining of the cooling water W accumulating on the surface of the steel strip 1 is achieved.

[0048] Furthermore, the first side guide 101A according to the second embodiment is inclined in a direction away from the steel strip 1 with respect to the vertical direction as it goes downward in the vertical direction. Therefore, according to this configuration, after the cooling water W drained by the injection of the fluid F hits the first side guide 101A, a portion of it is discharged downward in the vertical direction. As a result, more effective draining of the cooling water W accumulating on the surface of the steel strip 1 is achieved.

[0049] In this way, the first side guide 101A according to the second embodiment allows a portion of the cooling water W to collide with the first side guide 101A at an angle greater than 90 degrees when viewed from above the steel strip 1. On the other hand, even when a portion of the cooling water W collide with the first side guide 101A at an angle of less than 90 degrees, because the first side guide 101A is inclined with respect to the vertical direction, a portion of the cooling water W is discharged downward in the vertical direction. Therefore, according to this configuration, even if the angle β of the first side guide 101A with respect to the conveying direction TD is not sufficiently large, the cooling water W is prevented from returning to the surface of the steel strip 1, and more effective draining is achieved.

[0050] <Third embodiment> Next, a hot-rolled steel strip manufacturing apparatus 10 according to a third embodiment of the present invention will be described with reference to Figures 10 and 11. In the hot-rolled steel strip manufacturing apparatus 10 according to the first embodiment, the entire first side guide 101B is inclined with respect to the vertical direction. However, in the first side guide 101B according to this third embodiment, only the upstream portion in the conveying direction TD is inclined with respect to the vertical direction. In the description of this third embodiment, a description of configurations common to the first embodiment will be omitted.

[0051] As shown in Figure 10, the first side guide 101B is inclined in a direction away from the steel strip 1 on the upstream side in the conveying direction TD as it moves vertically downward. On the other hand, the first side guide 101B is aligned with the vertical direction on the downstream side in the conveying direction TD. In other words, the upper edge 111 of the first side guide 101B is aligned with the conveying direction TD. On the other hand, the lower edge 113 of the first side guide 101B is inclined in a direction away from the steel strip 1 on the upstream side in the conveying direction TD.

[0052] 11, the first side guide 101B has a twisted shape such that a portion inclined with respect to the vertical direction gradually changes to a portion aligned with the vertical direction from the upstream side to the downstream side in the conveying direction TD. In other words, the first side guide 101B has a downstream edge 121 in the conveying direction TD aligned with the vertical direction, and an upstream edge 123 that is open downward in the vertical direction, and the two sides of the downstream edge 121 and the upstream edge 123 are connected by a curved surface. Note that "upstream of the first side guide 101B" refers to the area excluding the downstream edge 121 of the first side guide 101B. That is, as shown in Figure 11, this includes a configuration in which only the downstream edge 121 of the first side guide 101B is aligned vertically, with the area other than the downstream edge 121 being inclined, and further includes a configuration in which a predetermined range of area from the downstream edge 121 in the conveying direction TD is aligned vertically, with the other area being inclined. The degree of twist of the first side guide 101B is defined as the distance D (see Figure 10) between the upper edge 111 and the lower edge 113 when the first side guide 101B is viewed from above. In this case, the distance D is set within a range that allows the first side guide 101B to discharge the cooling water W and does not deviate from the purpose of suppressing meandering of the steel strip 1.

[0053] As described above, in the hot-rolled steel strip manufacturing apparatus 10 according to the third embodiment, the upstream side of the first side guide 101B is inclined in a direction away from the steel strip 1 as it goes vertically downward, and the downstream side is aligned vertically. As a result, after the cooling water W drained by the injection of the fluid F hits the first side guide 101B, most of it is discharged vertically downward (see arrow A in FIG. 11). As a result, more effective draining of the cooling water W accumulating on the surface of the steel strip 1 is achieved.

[0054] Furthermore, the downstream side of the first side guide 101B in this third embodiment is aligned vertically. Furthermore, a second side guide 102 is provided downstream of the first side guide 101B in the conveying direction TD. The second side guide 102 is arranged vertically. This reduces the difference in installation angle between the first side guide 101B and the second side guide 102, so that even if the steel strip 1 meanders, the phenomenon of the steel strip 1 getting caught between the first side guide 101B and the second side guide 102 (i.e., the steel strip 1 getting caught) is less likely to occur.

[0055] (Variation) In the third embodiment, the upper edge 111 of the first side guide 101B is aligned with the conveying direction TD, and the lower edge 113 is inclined with respect to the conveying direction TD. However, the present invention is not limited to this. In a modified example, the first side guide 101C is disposed so that the entire first side guide 101C is inclined with respect to the conveying direction TD.

[0056] 12, the entire first side guide 101C is disposed on the upstream side in the conveying direction TD, tilted at an angle β in a direction away from the steel strip 1 as it goes vertically downward. In other words, the distance between the first side guide 101C and the axial end 18a of the conveying roll 18 becomes wider as it goes upstream in the conveying direction TD.

[0057] The first side guide 101C is inclined in a direction away from the steel strip 1 as it goes vertically downward on the upstream side in the conveying direction TD. On the other hand, the first side guide 101C is aligned with the vertical direction on the downstream side in the conveying direction TD. In other words, the upper edge 111 of the first side guide 101C is inclined at an angle β with respect to the conveying direction TD. On the other hand, the lower edge 113 of the first side guide 101C is inclined in a direction away from the steel strip 1 further than the upper edge 111 on the upstream side in the conveying direction TD. That is, as shown in FIG. 13, the first side guide 101C has a twisted shape from the upstream side to the downstream side in the conveying direction TD so that the portion inclined with respect to the vertical direction becomes the portion aligned with the vertical direction. The degree of twist of the first side guide 101C is defined as the distance D between the upper edge 111 and the lower edge 113 when the first side guide 101C is viewed in a plan view (see FIG. 12). In this case, the distance D is set within a range that allows the cooling water W to be discharged by the first side guide 101C and does not deviate from the purpose of suppressing meandering of the steel strip 1. For example, the distance D is set based on the results of a fluid simulation regarding the discharge of the cooling water W or the results of a test using an actual machine so that the distance D decreases as the angle β increases.

[0058] As described above, according to this modification, the same effects as those of the first side guide 101B of the third embodiment can be obtained, and also the same effects as those of the first side guide 101A of the second embodiment can be obtained.

[0059] In the third embodiment and the modified example, the first side guides 101B and 101C are twisted into a curved shape, but the technology of the present disclosure is not limited to this. The first side guides 101B and 101C may be inclined with respect to the vertical direction on the upstream side and aligned along the vertical direction on the downstream side, and the twisted shape may be realized by combining a flat surface with a curved surface or by joining flat surfaces together. [Example]

[0060] In order to evaluate the performance of the hot-rolled steel strip manufacturing apparatus 10 and the hot-rolled steel strip manufacturing method according to the present invention, a fluid simulation was used to investigate the discharge behavior of the cooling water W. Specifically, based on the simulation results, the amount of water remaining on the surface of the steel strip 1 after draining was calculated.

[0061] In Comparative Example 1, the cooling water W was not drained off. As shown in FIG. 14, in Comparative Example 1, the amount of water remaining on the surface of the steel strip 1 (hereinafter referred to as the amount of water on the plate) was 502 (L / min). In Comparative Example 2, water was drained off and the side guide section 100 was composed of only the second side guide 102. In Comparative Example 2, the amount of water on the plate was 22 (L / min). In Comparative Example 3, water was drained off and the first side guide 101 was inclined only with respect to the conveying direction. In Comparative Example 3, the amount of water on the plate was 14 (L / min).

[0062] On the other hand, in Example 1, water was drained and the first side guide 101 was inclined with respect to the vertical direction. As shown in FIG. 14, in Example 1, the amount of water on the strip was 10 (L / min). In Example 2, water was drained and the first side guide 101 was inclined with respect to the vertical direction and with respect to the conveying direction. As shown in FIG. 14, in Example 2, the amount of water on the strip was 8 (L / min). As described above, in the hot-rolled steel strip manufacturing apparatus 10 according to this embodiment, the provision of the first side guide 101 allows the amount of water on the strip to be reduced, demonstrating that the cooling water W can be effectively discharged by water draining.

[0063] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications and applications within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

[0064] For example, in the above embodiment, an example was shown in which the drain nozzles 16a were provided on both sides in the strip width direction WD and the cooling water W on the steel strip 1 was drained from both sides in the strip width direction WD, but the present invention is not limited to such an example. For example, as shown in Figure 15, an embodiment may be such that the drain nozzle 16a is provided on one side in the strip width direction WD and the cooling water W is drained from one side in the strip width direction WD. In this case, the position where draining starts is, for example, the drain nozzle 16a side of the range where the drain water is sprayed onto the steel strip 1 (for example, near the end of the steel strip 1 in the strip width direction WD on the drain nozzle 16a side).

[0065] In the above embodiment, the side guide unit 100 includes the second side guide 102, but the present invention is not limited to this example. The side guide unit 100 according to the present invention only needs to have the first side guide 101 at a position facing the draining nozzle 16a, and the guide members in other areas may have the shape of, for example, a flat, long plate whose longitudinal direction is aligned with the conveying direction TD. [Explanation of symbols]

[0066] 1 Hot rolled steel strip 10. Hot-rolled steel strip manufacturing equipment 14 Finishing rolling mill 14a Finishing roll 15 Cooling device 16 Draining device 16a Drain nozzle (spray part) 17 Winding device 18 Transport roll 18a Axial end 19 Side guide 100 Side guide part 101, 101A, 101B, 101C First side guide (side guide) 102 Second side guide 111 upper edge 113 Lower edge 121 downstream edge 123 Upstream edge α angle β angle F fluid L1 Virtual line L2 Imaginary line ST10 Step ST12 Step W Cooling water TD conveying direction WD Sheet width direction

Claims

1. A side guide that suppresses meandering caused by the transport of a hot-rolled steel strip, the side guide being inclined in a direction away from the steel strip with respect to the vertical direction as it goes downward in the vertical direction; an injection section provided at a position facing the side guide in the width direction of the steel strip, which injects a fluid for draining the cooling water used on the steel strip so that the cooling water passes through the steel strip toward the side guide and hits the side guide and is discharged from above the steel strip; A hot rolled steel strip manufacturing apparatus comprising:

2. the opposing position is a position that includes a range of a predetermined angle from the ejection direction of the fluid, The predetermined angle is calculated by the following formula (1): The apparatus for manufacturing a hot rolled steel strip according to claim 1. α=arctan(p1 / p2)...(1) where α is a predetermined angle p1: Momentum of cooling water moving together with the steel strip p2: momentum of the fluid

3. The side guide is inclined in a direction away from the steel strip with respect to the conveying direction as it goes upstream in the conveying direction of the steel strip.

3. The apparatus for manufacturing a hot rolled steel strip according to claim 1 or 2.

4. The side guide is inclined in a direction away from the steel strip as it goes downward in the vertical direction on the upstream side of the conveying direction of the steel strip, and is aligned along the vertical direction on the downstream side of the conveying direction. The apparatus for manufacturing a hot rolled steel strip according to any one of claims 1 to 3.

5. Using cooling water for the hot-rolled steel strip that is transported in a state where meandering is suppressed by side guides; a fluid for draining the cooling water used on the steel strip is sprayed so that the cooling water passes through the steel strip, toward the side guides which are inclined in a direction away from the steel strip as they go downwards relative to the vertical direction, and is discharged from above the steel strip after hitting the side guides; A method for producing a hot rolled steel strip, comprising:

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