JP7514690B2 - Rolled material manufacturing system and method for manufacturing rolled material - Google Patents

Description

The present invention relates to a rolling material manufacturing system for rolled material produced by hot rolling, and a method for manufacturing rolled material.

One type of steel material used in structures and buildings is H-shaped steel, which has an H-shaped cross section. H-shaped steel is a rolled material manufactured by hot rolling, and has a pair of flanges and a web connecting the pair of flanges. An oxide film called scale is formed on the surface of the rolled material during the rolling process. The scale formed on the surface of the rolled material causes defects in the rolled material. In addition, differences in the thickness of the scale cause localized uneven cooling of the rolled material, which can also cause thermal deformation of the rolled material. Therefore, in the rolling process, it is necessary to remove the scale formed on the surface of the rolled material before finishing rolling. For example, Patent Document 1 describes a descaling device that performs a descaling process to remove scale by spraying high-pressure water onto the surface of the rolled material during the rolling process.

JP 2017-80786 A

However, in the descaling process, high-pressure water is sprayed onto the rolled material, lowering its temperature. At this time, the amount of cooling by the high-pressure water is not uniform above and below the rolled material, resulting in a temperature difference between the top and bottom of the rolled material. This temperature difference between the top and bottom causes the rolled material to deform, making it more likely to have poor flange squareness.

The present invention was made in consideration of the above problems, and aims to provide a rolled material manufacturing system and a rolled material manufacturing method that can improve the dimensional stability of the flange perpendicularity of hot-rolled rolled material.

The rolled material manufacturing system for solving the above problem is a rolled material manufacturing system that performs a finish rolling process on a rolled material that has been subjected to a rough rolling process and has a pair of flanges and a web connecting the pair of flanges, and includes a descaling device that performs a descaling process to remove scale from the rolled material that has been subjected to the rough rolling process using high-pressure water, a finishing rolling mill that performs the finish rolling process on the rolled material that has been subjected to the descaling process, an induction device that induces the rolled material to the finishing rolling mill, a first cooling mechanism that is disposed between the descaling device and the induction device, and a second cooling mechanism and a third cooling mechanism that are provided in the induction device, and the first cooling mechanism and the second cooling mechanism spray cooling liquid toward the lower corner of the rolled material formed by the web and the flange, and the third cooling mechanism sprays cooling liquid toward the upper corner of the rolled material formed by the web and the flange.

According to the above configuration, by providing a third cooling mechanism for the upper part of the rolled material, which is easier to cool, and providing two cooling mechanisms, the first and second cooling mechanisms, for the lower part of the rolled material, which is harder to cool, cooling liquid can be sprayed at appropriate locations according to the tendency of the flange perpendicularity of the rolled material before the finish rolling process, thereby reducing the temperature difference between the top and bottom of the rolled material caused by the descaling process. Therefore, the dimensional stability of the flange perpendicularity of the rolled material can be improved.

In the above-mentioned rolled material manufacturing system, it is preferable that the finishing rolling machine includes a roll located above the rolled material and a fourth cooling mechanism for cooling the roll, and the induction device includes a shielding member located between the rolled material and the roll. According to the above-mentioned configuration, the shielding member reduces the amount of coolant from the fourth cooling mechanism that flows into the upper part of the rolled material, thereby further reducing the temperature difference between the top and bottom of the rolled material, and also reducing the difference between the temperature difference between the top and bottom at the leading end side and the terminal end side of the rolled material. This further improves the dimensional stability of the flange squareness of the rolled material.

In the above-mentioned rolling material manufacturing system, it is preferable that the shielding member is provided so that its position can be adjusted in the conveying direction of the rolling material. According to the above-mentioned configuration, the shielding member can be changed to a suitable position in the conveying direction of the rolling material. This makes it possible to easily change the position of the shielding member according to, for example, the diameter of the rolls in the finishing rolling mill.

In the above-mentioned rolled material manufacturing system, a cutting machine for cutting the rolled material that has been subjected to the finishing process is further provided, and the cutting machine is provided with a blade that cuts the rolled material by rotating, a cover that covers the blade, and a fifth cooling mechanism that cools the blade, and it is preferable that the cover is provided with a water draining portion arranged on the inner surface opposite each surface of the blade. If the cooling liquid of the fifth cooling mechanism flows down onto the rolled material and the rolled material is cut in an excessively cooled state, the flange may be deformed and the flange squareness may be adversely affected. In such a case, the water draining portion provided on the cover reduces the amount of the cooling liquid of the fifth cooling mechanism that flows down onto the rolled material, thereby preventing the cut portion of the rolled material 10 from being excessively cooled. This can further improve the dimensional stability of the flange squareness of the rolled material.

In the above-mentioned rolled material manufacturing system, the induction device includes a detection unit that detects when the leading end of the rolled material in the front-rear direction reaches the induction device, and a control device that controls the second cooling mechanism and the third cooling mechanism, and the control device preferably drives the second cooling mechanism and the third cooling mechanism at a specific timing based on the time when the detection unit detects the leading end. According to the above-mentioned configuration, a specific area in the front-rear direction of the rolled material can be cooled by the second cooling mechanism and the third cooling mechanism based on the position of the leading end of the rolled material detected by the detection unit and the line speed of the production line. This can further improve the dimensional stability of the flange squareness of the rolled material.

The method for manufacturing rolled material to solve the above problem is a method for manufacturing rolled material in which a finish rolling process is performed on a rolled material that has been subjected to a rough rolling process and has a pair of flanges and a web connecting the pair of flanges, and includes a descaling process in which scale of the rolled material that has been subjected to the rough rolling process is removed by high-pressure water from a descaling device, a first cooling process in which the rolled material is cooled by a first cooling mechanism to adjust the temperature difference of the rolled material that accompanies the descaling process, and a second cooling mechanism and a third cooling mechanism provided in an induction device that induces the rolled material to a finishing rolling mill to adjust the temperature difference. The method includes a second cooling process in which the rolled material is cooled to obtain a finished product, and a finish rolling process in which the finish rolling mill performs a finish rolling process on the rolled material cooled in the first and second cooling processes. In the first cooling process, the first cooling mechanism sprays cooling liquid toward the lower corners formed by the web and the flange at the bottom of the rolled material, and in the second cooling process, the second cooling mechanism sprays cooling liquid toward the lower corners, and the third cooling mechanism sprays cooling liquid toward the upper corners formed by the web and the flange at the top of the rolled material.

The present invention can improve the dimensional stability of the flange squareness of hot-rolled rolled material.

FIG. 1 is a schematic diagram showing the configuration of a rolled material production system. FIG. FIG. 2 is a schematic diagram showing the configuration of a descaling device as viewed from the cross-sectional direction of a rolled material. FIG. 4 is a schematic diagram showing the configuration of a cooling device as viewed from a cross-sectional direction of a rolled material. FIG. 2 is a schematic diagram showing the internal configuration of an upstream guide device and the configuration of a finishing rolling mill. FIG. 4 is a schematic diagram showing the configurations of the second cooling mechanism and the third cooling mechanism in the upstream induction device as viewed from the cross-sectional direction of the rolled material. FIG. 4 is a block diagram showing a configuration of a control device that controls a lower cooling unit and an upper cooling unit in the upstream induction device. FIG. 1 is a schematic diagram showing the configuration of a shielding member and a finishing rolling machine as viewed from above, the shielding member being provided above an upstream guiding device to prevent the cooling liquid for cooling the finishing rolling rolls from flowing into the space above the rolled material. FIG. 4 is a schematic diagram showing a configuration of a downstream guide device as viewed from a cross-sectional direction of the rolled material. FIG. 4 is a schematic diagram showing the configuration of a cut-off machine as viewed from the cross-sectional direction of a rolled material. FIG. FIG. 13 is a cross-sectional view showing an example of a defective perpendicularity in a rolled material, in which the rolled material is deformed into an inverted eight shape. FIG. 13 is a cross-sectional view showing an example of a squareness defect in a rolled material, in which the rolled material is deformed into a figure eight shape. 6 is a flowchart showing a procedure of a process in which the control device drives the second cooling mechanism and the third cooling mechanism.

A rolled material manufacturing system to which the present invention is applied will be described below with reference to Figs.
[Rolled material manufacturing system]
The rolled material manufacturing system 1 is a manufacturing system for manufacturing H-shaped steel by hot rolling, and is a manufacturing equipment row composed of a plurality of devices. As shown in FIG. 1, the rolled material manufacturing system 1 includes, in order from the upstream, a descaling device 20, a cooling device 30, an upstream induction device 40 and a shielding member 50, a finishing rolling machine 60, a downstream induction device 70, and a cutting machine 80. In addition, a roughing rolling machine (not shown) is provided upstream of the rolled material manufacturing system 1, and the rolled material 10 formed into an H-shaped cross section by the roughing rolling machine is transported to the descaling device 20. In the rolled material manufacturing system 1, the rolled material 10 is transported at a constant speed from upstream to downstream by a transport line (not shown).

The descaling device 20 uses high-pressure water to remove scale that has formed on the surface of the rolled material 10 that has been roughly rolled upstream. The cooling device 30 is located between the descaling device 20 and the upstream induction device 40, and sprays cooling liquid from below onto the rolled material 10 transported from the descaling device 20. The upstream induction device 40 guides the rolled material 10 transported from the descaling device 20 to the finishing rolling machine 60 located downstream of the upstream induction device 40. The finishing rolling machine 60 is a universal rolling machine composed of multiple rolling rolls, and performs a finishing rolling process on the rolled material 10. In addition, an air blow device 100a is provided downstream of the descaling device 20, and an air blow device 100b is provided downstream of the air blow device 100a and upstream of the upstream induction device 40. The air blow devices 100a and 100b remove the high-pressure water remaining on the rolled material 10 due to the descaling process before the finishing rolling process. The downstream guide device 70 is equipped with a straightener, which straightens the shape of the rolled material 10 that has been subjected to the finish rolling process. The cutter 80 cuts the rolled material 10 that has been subjected to the finish rolling process.

[Rolled material]
As shown in FIG. 2, the rolled material 10 extends in the front-rear direction, which is the conveying direction. The rolled material 10 includes a pair of flanges 11 extending in the up-down direction, a web 12 provided to connect the central parts of the pair of flanges 11, and a fillet 13 provided at a corner formed by the pair of flanges 11 and the web 12. The rolled material 10 further includes an upper space 14, which is an area surrounded by the upper parts of the pair of flanges 11 and the upper surface of the web 12, and a lower space 15, which is an area surrounded by the lower parts of the pair of flanges 11 and the lower surface of the web 12. In the rolled material 10, the upper part of the upper space 14 is open, whereas the upper part of the lower space 15 is closed by the web 12. Therefore, the rolled material 10 is in a state in which the temperature of the upper side is more likely to decrease than that of the lower side due to air cooling during conveyance.

[Descaling device]
As shown in FIG. 3, the descaling device 20 includes an exterior box, and the roughly rolled rolled material 10 is transported inside the exterior box. The descaling device 20 includes a high-pressure water unit 21 inside the exterior box in the up, down, left and right directions perpendicular to the transport direction. The high-pressure water unit 21 includes a plurality of injection nozzles 22, and injects high-pressure water onto the entire surface of the rolled material 10. The roughly rolled rolled material 10 has an oxide film called scale formed on its surface. The descaling device 20 performs a descaling process to remove the scale formed on the surface of the rolled material 10 by injecting high-pressure water from above, below, left and right of the rolled material 10 using the injection nozzles 22.

In the descaling device 20, the high-pressure water injected from the injection nozzle 22 reduces the temperature of the rolled material 10. Specifically, the high-pressure water injected from below the rolled material 10 reaches the rolled material 10 with its momentum weakened by gravity compared to the high-pressure water injected from above the rolled material 10. Therefore, the temperature drop due to the high-pressure water is greater on the upper side of the rolled material 10 than on the lower side. In addition, the high-pressure water that reaches the lower part of the rolled material 10 tends to flow downward through the lower space 15, whereas the high-pressure water that reaches the upper part of the rolled material 10 tends to remain in the upper space 14. Although the high-pressure water that remains in the upper space 14 is removed by the air blowing devices 100a, 100b (see FIG. 1), the high-pressure water that remains in the upper space 14 also reduces the temperature of the upper side of the rolled material 10. From this point of view, the descaling process causes the upper side of the rolled material 10 to have a lower temperature than the lower side, resulting in a temperature difference between the upper and lower sides of the rolled material 10. If finish rolling is performed with a temperature difference between the top and bottom of the rolled material 10, the top and bottom of the rolled material 10 will deform in different ways, making it more likely that defects in the flange squareness will occur.

[Cooling system]
As shown in FIG. 4, the cooling device 30 is located on the conveying line downstream of the descaling device 20 and upstream of the upstream induction device 40, and more specifically, is provided between the air blow devices 100a and 100b. The cooling device 30 is a first cooling mechanism for reducing the temperature difference between the top and bottom of the rolled material 10 caused by the descaling process. The cooling device 30 includes first cooling nozzles 31a and 31b facing the lower fillet 13 of the rolled material 10. The first cooling nozzles 31a and 31b inject cooling liquid onto the lower fillet 13 of the rolled material 10 to cool the lower part of the rolled material 10. As an example, the cooling liquid here is cooling water. By injecting cooling liquid onto the fillet 13, deformation due to the temperature difference between the top and bottom of the rolled material 10, which causes defects in the flange squareness, can be effectively suppressed. In addition, the temperature difference between the top and bottom of the rolled material 10 caused by the descaling process is reduced by cooling the lower part of the rolled material 10 by the cooling device 30 in the entire area in the front-rear direction, which is the transport direction of the rolled material 10. The first cooling nozzles 31a, 31b are provided with on-off valves, and only one of them can be opened or both can be closed depending on the tendency of flange squareness defects caused in the rolled material 10.

[Upstream guidance device]
As shown in FIG. 5, the upstream guide device 40 is located downstream of the descaling device 20 and the cooling device 30, and includes a main body 41 having a box shape, a first guide member 42 provided on the upper side of the main body 41, and a second guide member 43 provided on the lower side of the main body 41. In FIG. 5, the cross-sectional structure of the rolled material 10 and the main body 41 is illustrated for convenience. The first guide member 42 and the second guide member 43 extend parallel to the conveying direction of the rolled material 10 inside the main body 41, and both ends are located outside the main body 41. The first guide member 42 is located in the upper space 14 and is supported by a support member (not shown) provided on the upper part of the main body 41. The second guide member 43 is located in the lower space 15 and is supported by a support member (not shown) provided on the lower part of the main body 41.

As shown in FIG. 6, the first guide member 42 has a width slightly narrower than the distance between the pair of flanges 11. Similarly, the second guide member 43 has a width slightly narrower than the distance between the pair of flanges 11. With the first guide member 42 positioned in the upper space 14 and the second guide member 43 positioned in the lower space 15, the rolled material 10 is guided in the horizontal direction perpendicular to the conveying direction to a position corresponding to the rolling rolls of the finishing mill 60 located downstream. For convenience, the main body 41 is not shown in FIG. 6.

As shown in FIG. 5, the upstream guiding device 40 includes a sensor 44 such as a photoelectric tube provided on the upstream side. The sensor 44 is provided, for example, on the upstream side inside the main body 41. The sensor 44 may be provided on the outside of the main body 41. The upstream guiding device 40 also includes a lower cooling unit 45 provided on the upper surface of the second guide member 43 and located downstream of the sensor 44, and an upper cooling unit 46 provided on the lower surface of the first guide member 42, downstream of the lower cooling unit 45, and located outside the main body 41. The positions of the lower cooling unit 45 and the upper cooling unit 46 may be located downstream of the sensor 44 in the conveying direction, and for example, both the lower cooling unit 45 and the upper cooling unit 46 may be provided inside the main body 41.

The sensor 44 is a detection unit for detecting that the leading end of the rolled material 10 transported from upstream has been transported to the upstream induction device 40. The lower cooling unit 45 is a second cooling mechanism for reducing the temperature difference between the top and bottom of the rolled material 10 caused by the descaling process. The upper cooling unit 46 is a third cooling mechanism for reducing the temperature difference between the top and bottom of the rolled material 10 caused by the descaling process. The lower cooling unit 45 and the upper cooling unit 46 are controlled by a control device 90 provided in the upstream induction device 40.

As shown in FIG. 6, the lower cooling unit 45 includes second cooling nozzles 45a, 45b that face the lower fillet 13 of the rolled material 10. The second cooling nozzles 45a, 45b spray coolant onto the lower fillet 13 of the rolled material 10 to cool the lower portion of the rolled material 10. In addition, a pipe for coolant (not shown) is provided on the lower surface of the second guide member 43, and supplies coolant to the second cooling nozzles 45a, 45b.

The upper cooling unit 46 is equipped with third cooling nozzles 46a, 46b that face the upper fillet 13 of the rolled material 10. The third cooling nozzles 46a, 46b spray coolant onto the upper fillet 13 of the rolled material 10 to cool the upper portion of the rolled material 10. In addition, a pipe for coolant (not shown) is provided on the upper surface of the first guide member 42, and supplies coolant to the third cooling nozzles 46a, 46b.

The flow rate and pressure of the second cooling nozzles 45a, 45b and the third cooling nozzles 46a, 46b are appropriately selected taking into consideration the size of the rolled material 10, etc. Also, as an example, the cooling liquid here is cooling water. By cooling the rolled material 10 by the lower cooling unit 45 and the upper cooling unit 46 while the rolled material 10 is guided, i.e., positioned, toward the finishing rolling machine 60 by the first guide member 42 and the second guide member 43, the cooling liquid can be sprayed accurately onto the fillet 13, and the cooling efficiency can be improved.

As described above, the temperature of the upper side of the rolled material 10 tends to drop more easily than that of the lower side due to the descaling process. In addition, the temperature difference between the top and bottom of the rolled material 10 is also increased by air cooling during transportation. Therefore, there are cases where the temperature difference between the top and bottom of the rolled material 10 cannot be sufficiently reduced by only one of the cooling device 30 and the lower cooling unit 45. In such cases, the temperature difference between the top and bottom of the rolled material 10 can be more reliably reduced by using the cooling device 30 and the lower cooling unit 45 in cooperation to cool the lower part of the rolled material 10.

[Control device]
As shown in FIG. 7, the upstream induction device 40 includes a control device 90 that controls the lower cooling unit 45 and the upper cooling unit 46. The control device 90 is a computer system included in a control system that controls the rolled material manufacturing system 1. In the control system, in addition to the lower cooling unit 45 and the upper cooling unit 46, the control system also controls the roll cooling unit 62 (see FIG. 8) included in the finishing mill 60, the blade cooling unit 83 (see FIG. 10) included in the cutting machine 80, and the air blow devices 100a and 100b, which will be described later, in addition to the above-mentioned cooling device 30. The control device 90 includes a control unit 91 that controls the driving of the lower cooling unit 45 and the upper cooling unit 46, a storage unit 92 in which manufacturing conditions and the like are stored, and a touch panel 93 for operating the control device 90. The control unit 91 is, for example, a CPU, and executes a process of controlling the lower cooling unit 45 and the upper cooling unit 46 according to a control program stored in the storage unit 92. The storage unit 92 is, for example, a storage medium such as a memory, and has installed therein software for the control unit 91 to control the lower cooling unit 45 and the upper cooling unit 46. The storage unit 92 also stores various manufacturing conditions in the rolled material manufacturing system 1, such as the line speed. The touch panel 93 outputs an operation signal to the control unit 91 based on an operation by an operator, and displays various statuses, such as the cooling conditions of the lower cooling unit 45 and the upper cooling unit 46.

The control unit 91 is also connected to the sensor 44, and recognizes that the leading end of the rolled material 10 has been transported to the upstream guide device 40 and that the trailing end of the rolled material 10 has been transported to the upstream guide device 40 by a detection signal input from the sensor 44. The control unit 91 executes a process of spraying cooling liquid from any of the second cooling nozzles 45a, 45b and the third cooling nozzles 46a, 46b at a specific timing according to the tendency of flange squareness defects occurring in the rolled material 10, based on the time when the leading end of the rolled material 10 is transported to the upstream guide device 40.

[Shielding member]
As shown in FIG. 8, the shielding member 50 is a T-shaped plate-like member provided on the upper part of the main body 41. The shielding member 50 includes a shielding portion 51 extending downstream of the main body 41, and a fixing portion 52 that is narrower than the shielding portion 51 and extends upstream of the main body 41. The shielding portion 51 has a width equal to or greater than the width of the rolled material 10. The shielding portion 51 is provided downstream of the main body 41, between an upper roll 61 of a finishing mill 60 (described later) and the main body 41, so as to cover the upper space 14 of the rolled material 10. The fixing portion 52 includes a plurality of guide holes 53 and a plurality of fixing members 54. The guide holes 53 are through holes of a substantially rectangular shape that penetrate the shielding member 50 in the plate thickness direction, and the conveying direction of the rolled material 10 is the longitudinal direction. The fixing members 54 are attached to the main body 41 via the guide holes 53. The shielding member 50 is fixed to the main body 41 by a fixing member 54 so as to be slidable in the conveying direction. As an example, the fixing member 54 is a bolt and a nut, and the shielding member 50 can be moved upstream or downstream in the conveying direction by loosening the bolt and the nut. Therefore, since the shielding member 50 is slidable in the conveying direction, it is configured to be easily moved to a suitable position according to the diameter of the upper roll 61.

[Finishing rolling machine]
The finishing rolling mill 60 is located downstream of the upstream induction device 40. The finishing rolling mill 60 is a universal rolling mill equipped with rolling rolls for performing a finishing rolling process on the rolling material 10 in each of the up, down, left and right directions perpendicular to the conveying direction of the rolling material 10. In addition, for convenience, in FIG. 5 and FIG. 8, of the multiple rolling rolls constituting the finishing rolling mill 60, only the upper roll 61 located above the rolling material 10 is illustrated. The upper roll 61 has a rolling surface formed on the outer circumferential surface and an opposing side surface. The finishing rolling mill 60 is equipped with a roll cooling unit 62 as a fourth cooling mechanism for cooling the upper roll 61 in the vicinity of the upper roll 61. The roll cooling unit 62 is equipped with fourth cooling nozzles 62a, 62b. The fourth cooling nozzles 62a, 62b spray cooling liquid onto the rolling surface and side surface of the upper roll 61 from a position facing the side surface of the upper roll 61. The cooling liquid here is, for example, cooling water.

The cooling liquid sprayed from the fourth cooling nozzles 62a and 62b flows down after reaching the upper roll 61, and flows into the upper space 14 of the rolled material 10 located below and remains there. The cooling amount of the upper part of the rolled material 10 increases due to the cooling liquid that remains in the upper space 14, and the temperature difference between the top and bottom of the rolled material 10 increases. Therefore, as shown in FIG. 5, in this embodiment, the above-mentioned shielding member 50 is arranged below and upstream of the upper roll 61 so as to cover the upper space 14. This reduces the amount of cooling liquid sprayed from the fourth cooling nozzle 62a that flows into the upper space 14, and the cooling amount at the top of the rolled material 10 is reduced, so that the temperature difference between the top and bottom of the rolled material 10 can be reduced. In addition, since the shielding member 50 is slidable in the transport direction, it is easily moved to a suitable position according to the diameter of the upper roll 61.

In addition, at the end side in the front-rear direction of the rolled material 10, the cooling liquid remaining in the upper space 14 at the front end side remains, and the cooling liquid from the fourth cooling nozzles 62a and 62b flows in, so the amount of cooling liquid remaining in the upper space 14 increases compared to the front end side. As a result, the temperature at the end side of the rolled material 10 becomes lower than at the front end side, and the temperature difference between the top and bottom is also larger at the end side. For this reason, at the end side of the rolled material 10, flange squareness defects are more likely to occur, and the degree of deformation is greater than at the front end side. In this embodiment, the shielding member 50 reduces the amount of cooling liquid sprayed from the fourth cooling nozzle 62a that flows into the upper space 14, so the temperature difference between the top and bottom in the entire front-rear direction of the rolled material 10 can be reduced, and the difference between the temperature difference between the top and bottom at the front end side of the rolled material 10 and the temperature difference between the top and bottom at the end side can be reduced.

[Downstream guide device]
As shown in FIG. 9, the downstream guiding device 70 is located downstream of the finishing rolling mill 60 and includes a pair of straightening rollers 71 provided on both sides in the left-right direction perpendicular to the conveying direction of the rolled material 10. The pair of straightening rollers 71 are straightening machines for straightening the shape of the finish-rolled rolled material 10. The straightening rollers 71 are rolls with a difference in diameter in the vertical direction, and in this embodiment, the upper side has a larger diameter than the lower side. The pair of straightening rollers 71 guide the finish-rolled rolled material 10 downstream of themselves and correct the flange squareness of the finish-rolled rolled material 10. In addition, the lower side of the straightening roller 71 may have a larger diameter than the upper side, and is appropriately selected depending on the finish of the flange squareness of the finish-rolled rolled material 10.

Here, an example of a conventional flange squareness defect in a rolled material 10 is shown. As shown in FIG. 11, the rolled material 10 has a leading end 10a and a trailing end 10b, which are both ends in the front-rear direction. The leading end 10a and the trailing end 10b have a lower temperature at the top than at the bottom due to descaling. In addition, the cooling liquid from the fourth cooling nozzles 62a and 62b is retained in the upper space 14, so that the temperature difference between the top and bottom of the trailing end 10b is greater than the temperature difference between the top and bottom of the leading end 10a. If finish rolling is performed in this state, the flange squareness T after finish rolling will deteriorate due to deformation caused by the temperature difference between the top and bottom. Specifically, as shown in FIG. 12, the lower sides of the pair of flanges 11 are deformed into an inverted eight shape approaching each other, and the flange squareness T becomes larger. At this time, the deformation caused by the temperature difference between the top and bottom of the trailing end 10b is greater than that of the leading end 10a.

If there is a large difference in flange squareness T between the front and rear of the rolled material 10, and an attempt is made to use a straightening roller 71 to straighten the terminal end 10b, which has a large flange squareness T, within the tolerance, the flange squareness T may improve at the terminal end 10b, but may worsen at the tip end 10a. In such a case, as shown in Figure 13, the upper sides of the pair of flanges 11 at the tip end 10a are deformed into a figure eight shape, with the upper sides approaching each other.

For this reason, if the difference between the top and bottom temperatures at the leading end 10a and the terminal end 10b is large, it becomes difficult to correct the flange squareness T of both the leading end 10a and the terminal end 10b using the correction roller 71. In this embodiment, the shielding member 50 reduces the amount of coolant remaining in the upper space 14, thereby reducing the difference between the top and bottom temperature difference at the leading end of the rolled material 10 and the top and bottom temperature difference at the terminal end, making it possible to correct the flange squareness T using the correction roller 71.

[Cutting machine]
As shown in FIG. 10, the cutting machine 80 is located downstream of the downstream induction device 70, and includes a blade 81 having a rotating mechanism and a cover 82 that covers the blade. The blade 81 has a circular shape, and its outer periphery is configured in a sawtooth shape. The cutting machine 80 is driven in a direction perpendicular to the conveying direction of the rolled material 10, and cuts the rolled material 10 with the rotating blade 81. The cover 82 covers the blade 81 so that the lower part of the blade 81 is exposed, and on its inner surface, it includes a blade cooling unit 83 as a fifth cooling mechanism that cools the blade 81, and a plurality of water drains 84 arranged to face both sides of the blade 81. The blade cooling unit 83 includes fifth cooling nozzles 83a and 83b. The fifth cooling nozzles 83a are provided at positions facing both sides of the blade 81, respectively, and spray coolant onto both sides of the blade 81. The fifth cooling nozzles 83b are provided above the blade 81, and spray coolant from above the blade 81. The drain portion 84 is a plate-shaped member provided on the inner surface of the cover 82. ...

When cutting the rolled material 10, the cooling liquid sprayed from the fifth cooling nozzles 83a, 83b may flow down onto the rolled material 10, causing excessive cooling of the portion of the rolled material 10 to be cut by the blade 81. If the portion is cut in this state, the flange 11 may deform, adversely affecting the flange squareness T. In this embodiment, the draining portion 84 reduces the amount of cooling liquid flowing down onto the rolled material 10 from the fifth cooling nozzles 83a, 83b, and prevents the cut portion of the rolled material 10 from being excessively cooled, thereby preventing deterioration of the flange squareness T.

[Procedure for driving the cooling unit by the control device]
Next, an example of a processing procedure in which the control device 90 drives the lower cooling unit 45 and the upper cooling unit 46 to cool the rolled material 10 will be described with reference to FIG.

As shown in FIG. 14, in step S1, the sensor 44 detects that the tip 10a of the rolled material 10 has been transported to the upstream guide device 40, and outputs a first detection signal to the control unit 91. The control unit 91 starts measuring the elapsed time in the cooling process using a timer based on the time when the first detection signal is input from the sensor 44.

In step S2, the control unit 91 executes a process of driving the upper cooling unit 46 when a first predetermined time has elapsed from the reference time. As a result, cooling liquid is sprayed from the third cooling nozzles 46a, 46b onto the upper fillet 13 at the tip 10a of the rolled material 10. At this time, the lower cooling unit 45 is not driven. The first predetermined time here is calculated from the line speed of the rolled material manufacturing system 1 and the product size of the rolled material 10 stored in the memory unit 92, based on the time when the first detection signal is input from the sensor 44, and is the time it takes for the tip 10a of the rolled material 10 to reach below the upper cooling unit 46.

Next, in step S3, the control unit 91 executes a process of driving the lower cooling unit 45 when a second predetermined time has elapsed from the reference time. As a result, cooling liquid is sprayed from the second cooling nozzles 45a, 45b to the lower fillet 13 at the end portion 10b of the rolled material 10. At this time, the upper cooling unit 46 is not driven. The second predetermined time here is calculated from the line speed of the rolled material manufacturing system 1 stored in the memory unit 92 and the product size of the rolled material 10, based on the time when the first detection signal is input from the sensor 44, and is the time when the end portion 10b of the rolled material 10 reaches above the lower cooling unit 45.

In addition, in step S4, the sensor 44 detects that the terminal end 10b of the rolled material 10 has been transported to the upstream guide device 40, and outputs a second detection signal to the control unit 91. Based on the second detection signal input from the sensor 44, the control unit 91 ends the cooling process at the timing when the terminal end 10b has passed through the upstream guide device 40.

In this way, the control unit 91 can drive the lower cooling unit 45 and the upper cooling unit 46 at a specific timing to cool specific areas in the front-to-rear direction of the rolled material 10, thereby suitably cooling each part in the front-to-rear direction of the rolled material 10. In the above example, at the leading end 10a, the upper fillet 13 is cooled by the upper cooling unit 46, and at the terminal end 10b, the lower fillet 13 is cooled by the lower cooling unit 45, thereby reducing the difference between the upper and lower temperatures at the leading end 10a and the terminal end 10b.

According to the above embodiment, the following effects can be obtained.
(1) An upper cooling unit 46 is provided for the upper part of the rolled material 10 which is easy to cool, and two cooling mechanisms, the cooling device 30 and the lower cooling unit 45, are provided for the lower part of the rolled material 10 which is difficult to cool. As a result, before the finish rolling process, a coolant is sprayed to an appropriate location according to the tendency of the flange squareness T of the rolled material 10, thereby reducing the temperature difference between the top and bottom of the rolled material 10 which occurs during the descaling process. Therefore, the dimensional stability of the flange squareness T of the rolled material 10 can be improved.

(2) By providing the lower cooling unit 45 and the upper cooling unit 46 in the upstream induction device 40, the cooling liquid can be precisely sprayed at the appropriate location on the rolled material 10 that is positioned by the upstream induction device 40, thereby improving the cooling efficiency. This further improves the dimensional stability of the flange squareness T of the rolled material 10.

(3) The cooling device 30, the lower cooling unit 45, and the upper cooling unit 46 spray cooling liquid onto the fillet 13, which effectively suppresses deformation caused by the temperature difference between the top and bottom of the rolled material 10, which causes deterioration of the flange squareness T. Therefore, the dimensional stability of the flange squareness T of the rolled material 10 can be further improved.

(4) By providing a shielding member 50 below the upper roll 61, the amount of cooling liquid sprayed from the roll cooling unit 62 onto the upper roll 61 that flows down into the upper space 14 can be reduced, and the amount of cooling liquid remaining in the upper space 14 can be reduced. This further reduces the temperature difference between the top and bottom of the rolled material 10, and also reduces the difference between the temperature difference between the top and bottom at the leading end 10a and the temperature difference between the top and bottom at the terminal end 10b. Therefore, the dimensional stability of the flange squareness T of the rolled material 10 can be further improved.

(5) By configuring the shielding member 50 to be slidable in the conveyance direction, it becomes easy to move the shielding member 50 to a suitable position according to the diameter of the upper roll 61.
(6) By providing a drainage section 84 on the cover 82, the cooling liquid sprayed from the fifth cooling nozzles 83a, 83b flows down onto the rolled material 10, thereby preventing the portion of the rolled material 10 that is cut by the blade 81 from being excessively cooled, thereby reducing deformation of the rolled material 10 due to cutting.

(7) Using the time when the sensor 44 detects the leading end 10a of the rolled material 10 as a reference, the control unit 91 drives each of the lower cooling unit 45 and the upper cooling unit 46 at a specific timing, thereby cooling a specific area in the front-to-rear direction of the rolled material 10. This makes it possible to effectively reduce the temperature difference between the top and bottom at each part in the front-to-rear direction, even if the temperature difference trends differ between the top and bottom in the front-to-rear direction of the rolled material 10. Therefore, the dimensional stability of the flange squareness T of the rolled material 10 can be further improved.

(8) At the tip portion 10a, the upper fillet 13 is cooled by the upper cooling unit 46, and at the end portion 10b, the lower fillet 13 is cooled by the lower cooling unit 45, thereby reducing the difference between the upper and lower temperatures at the tip portion 10a and the upper and lower temperatures at the end portion 10b.

(9) By providing air blow devices 100a, 100b upstream of the finishing rolling mill 60, the high-pressure water that has accumulated in the upper space 14 due to the descaling process can be removed. This can further reduce the temperature difference between the top and bottom of the rolled material 10, and can also reduce the difference between the temperature difference between the top and bottom at the leading end 10a and the terminal end 10b. Therefore, the dimensional stability of the flange squareness T of the rolled material 10 can be further improved.

The above embodiment can be modified as follows.
The configuration has been exemplified in which the control unit 91 cools the upper fillet 13 at the front end portion 10a with the upper cooling unit 46, and cools the lower fillet 13 at the rear end portion 10b with the lower cooling unit 45. However, the present invention is not limited to this, and the cooling location may be appropriately selected depending on the tendency of the flange perpendicularity T of the rolled material 10. The control unit 91 may also be configured to switch the drive states of the lower cooling unit 45 and the upper cooling unit 46 even in the central portion located between the front end portion 10a and the rear end portion 10b.

- The control unit 91 drives each of the lower cooling unit 45 and the upper cooling unit 46 at a specific timing. However, this is not limited to the above. For example, when the difference in flange perpendicularity T between the front and rear directions of the rolled material 10 is small, the control may be configured to always drive one of the second cooling nozzles 45a, 45b and the third cooling nozzles 46a, 46b depending on the tendency of the flange perpendicularity T, instead of controlling by timing.

- The control unit 91 may be configured to control the cooling device 30 in addition to the lower cooling unit 45 and the upper cooling unit 46. In this case, for example, a detector equivalent to the sensor 44 is provided in the descaling device 20 or the like, and the detector is connected to the control unit 91. This allows the control unit 91 to drive each of the cooling device 30, the lower cooling unit 45, and the upper cooling unit 46 located downstream of the detector at a specific timing, and control them to spray cooling liquid at any location in the front-to-rear direction of the rolled material 10.

- The upstream guidance device 40 is not limited to a configuration including a sensor 44, and may be configured, for example, such that any device located upstream of the upstream guidance device 40 includes a detector that detects the leading end of the rolled material 10, and a device located downstream of the device that includes the detector operates in conjunction with the device. Even in this case, the control unit 91 can drive the second cooling nozzles 45a, 45b and the third cooling nozzles 46a, 46b to cool specific regions in the up-down and front-to-back directions of the rolled material 10.

- An example of a configuration in which the upstream induction device 40 is equipped with a control device 90, and the control unit 91 drives the lower cooling unit 45 and the upper cooling unit 46 at a predetermined timing based on when the sensor 44 detects the leading end of the rolled material 10 has been shown. However, the configuration is not limited to the upstream induction device 40 being equipped with a control device 90, and for example, the configuration may be such that the lower cooling unit 45 and the upper cooling unit 46 are driven at a predetermined timing by a control system that controls the entire rolled material manufacturing system 1.

The cutting machine 80 is not limited to a configuration including a water draining section 84, and may be configured, for example, without the water draining section 84, to include an air blowing mechanism that sprays high-pressure air and prevents the cooling liquid sprayed from the fifth cooling nozzles 83a, 83b from flowing downward onto the rolled material 10. Even in this case, the amount of cooling liquid remaining in the upper space 14 can be reduced, and excessive cooling of the portion of the rolled material 10 that is cut by the blade 81 is suppressed, thereby reducing deformation of the rolled material 10 due to cutting.

The shielding member 50 is not limited to being slidable in the conveying direction, and may be configured to be position adjustable by removing and moving the fixing member 54 according to the diameter of the upper roll 61, for example. Even in this case, the amount of cooling liquid flowing from the roll cooling unit 62 into the upper space 14 can be reduced.

- An example of a configuration in which a shielding member 50 is provided on the upper part of the upstream guide device 40 has been given. However, this is not limited to this, and for example, if the cooling device 30, the lower cooling unit 45, and the upper cooling unit 46 can sufficiently reduce the difference in temperature between the top and bottom of the leading end 10a and the top and bottom of the terminal end 10b, the shielding member 50 does not need to be provided.

-An example of a configuration in which the air blow devices 100a and 100b are used to remove the cooling liquid remaining in the upper space 14 has been given. However, this is not limited to this, and if, for example, the cooling device 30, the lower cooling unit 45, and the upper cooling unit 46 can sufficiently reduce the difference in temperature between the top and bottom of the leading end 10a and the top and bottom of the terminal end 10b, the air blow devices 100a and 100b do not need to be provided. Also, a configuration in which only one of the air blow devices 100a and 100b is provided may be used.

- The shape of the shielding member 50 is not limited to a T-shape, and may be any shape that can cover the upper space 14, for example, a rectangle. Even in this case, the amount of cooling liquid remaining in the upper space 14 can be reduced.

- The number of cooling nozzles in each of the cooling device 30, the lower cooling unit 45, the upper cooling unit 46, the roll cooling unit 62, and the blade cooling unit 83 is not limited, and may be provided in the required quantity as appropriate based on, for example, the location requiring cooling, the required amount of cooling, and the amount of cooling per cooling nozzle.

- In each of the cooling device 30, the lower cooling unit 45, the upper cooling unit 46, the roll cooling unit 62, and the blade cooling unit 83, the cooling liquid is not limited to cooling water, but may be, for example, hot rolling oil.

Reference Signs List 1...Rolled material manufacturing system 10...Rolled material 11...Flange 12...Web 13...Fillet 20...Descaling device 30...Cooling device 40...Upstream guidance device 44...Sensor 45...Lower cooling unit 46...Upper cooling unit 50...Shielding member 60...Finishing rolling machine 61...Upper roll 62...Roll cooling unit 70...Downstream guidance device 80...Cutting machine 81...Blade 82...Cover 83...Blade cooling unit 84...Draining section 90...Control device

Claims (6)

A rolled material manufacturing system for performing a finish rolling process on a rolled material that has been subjected to a rough rolling process and that has a pair of flanges and a web connecting the pair of flanges,
A descaling device that performs a descaling process to remove scale from the rolled material that has been subjected to the rough rolling process using high-pressure water;
a finishing rolling mill which performs the finish rolling process on the rolled material that has been subjected to the descaling process;
A guide device that guides the rolling material to the finishing rolling mill;
a first cooling mechanism disposed between the descaling device and the induction device;
A second cooling mechanism and a third cooling mechanism are provided in the induction device,
The first cooling mechanism and the second cooling mechanism spray a cooling liquid toward a lower corner portion formed by the web and the flange, which is a lower portion of the rolled material,
The third cooling mechanism injects a cooling liquid toward an upper corner portion formed by the web and the flange, which is located above the rolled material ;
The finishing rolling mill includes a roll located above the rolled material and a fourth cooling mechanism that cools the roll,
The induction device includes a shielding member positioned between the rolled material and the roll,
The shielding member is located upstream of the roll in the conveying direction of the rolled material and is provided so as to be adjustable in position in the conveying direction with respect to the roll.
Rolled material manufacturing system. The rolling machine further includes a cutter for cutting the rolled material that has been subjected to the finish rolling treatment.
The cutting machine includes a blade that rotates to cut the rolled material, a cover that covers the blade, and a fifth cooling mechanism that cools the blade.
The rolled material production system according to claim 1 , wherein the cover includes a water cutting portion disposed on an inner surface opposite each surface of the blade. A rolled material manufacturing system for performing a finish rolling process on a rolled material that has been subjected to a rough rolling process and that has a pair of flanges and a web connecting the pair of flanges,
A descaling device that performs a descaling process to remove scale from the rolled material that has been subjected to the rough rolling process using high-pressure water;
a finishing rolling mill which performs the finish rolling process on the rolled material that has been subjected to the descaling process;
A guide device that guides the rolling material to the finishing rolling mill;
a first cooling mechanism disposed between the descaling device and the induction device;
A second cooling mechanism and a third cooling mechanism provided in the induction device;
a cutting machine that cuts the rolled material that has been subjected to the finish rolling treatment,
The first cooling mechanism and the second cooling mechanism spray a cooling liquid toward a lower corner portion formed by the web and the flange, which is a lower portion of the rolled material,
The third cooling mechanism injects a cooling liquid toward an upper corner portion formed by the web and the flange, which is located above the rolled material;
The cutting machine includes a blade that cuts the rolled material by rotating, a cover that covers the blade, and a fifth cooling mechanism that cools the blade,
The cover includes a drainage portion disposed on an inner surface opposite each surface of the blade.
Rolled material manufacturing system. The induction device includes a detection unit that detects that a front end portion of the rolled material in a front-rear direction has reached the induction device, and a control device that controls the second cooling mechanism and the third cooling mechanism,
The rolled material manufacturing system according to any one of claims 1 to 3 , wherein the control device drives each of the second cooling mechanism and the third cooling mechanism at a specific timing based on the time when the detection unit detects the tip portion. A method for manufacturing a rolled material, comprising: performing a finish rolling process on a rolled material having a pair of flanges and a web connecting the pair of flanges after rough rolling;
a descaling step of removing scale from the rolled material after the rough rolling process using high-pressure water from a descaling device;
a first cooling step of cooling the rolled material by a first cooling mechanism in order to adjust a temperature difference of the rolled material caused by the descaling step;
a second cooling step of cooling the rolled material to adjust the temperature difference by a second cooling mechanism and a third cooling mechanism provided in an induction device that induces the rolled material to a finishing rolling mill;
a finish rolling process in which the finish rolling process is performed on the rolled material cooled in the first cooling process and the second cooling process by the finish rolling mill,
In the first cooling step, the first cooling mechanism injects a cooling liquid toward a lower corner portion formed by the web and the flange, which is located below the rolled material;
In the second cooling step, the second cooling mechanism sprays a cooling liquid toward the lower corner portion, and the third cooling mechanism sprays a cooling liquid toward an upper corner portion formed by the web and the flange, which is located above the rolled material ,
The finishing rolling mill includes a roll located above the rolled material and a fourth cooling mechanism that cools the roll,
The induction device includes a shielding member positioned between the rolled material and the roll,
The shielding member is located upstream of the roll in the conveying direction of the rolled material and is provided so as to be positionally adjustable in the conveying direction with respect to the roll.
Manufacturing method of rolled material. A method for manufacturing a rolled material, comprising: performing a finish rolling process on a rolled material having a pair of flanges and a web connecting the pair of flanges after rough rolling;
a descaling step of removing scale from the rolled material after the rough rolling process using high-pressure water from a descaling device;
a first cooling step of cooling the rolled material by a first cooling mechanism in order to adjust a temperature difference of the rolled material caused by the descaling step;
a second cooling step of cooling the rolled material to adjust the temperature difference by a second cooling mechanism and a third cooling mechanism provided in an induction device that induces the rolled material to a finishing rolling mill;
a finish rolling process in which the finish rolling process is performed on the rolled material cooled in the first cooling process and the second cooling process by the finish rolling mill;
A cutting step of cutting the rolled material that has been subjected to the finish rolling treatment by a cutting machine,
In the first cooling step, the first cooling mechanism injects a cooling liquid toward a lower corner portion formed by the web and the flange, which is located below the rolled material;
In the second cooling step, the second cooling mechanism sprays a cooling liquid toward the lower corner portion, and the third cooling mechanism sprays a cooling liquid toward an upper corner portion formed by the web and the flange, which is located above the rolled material,
The cutting machine includes a blade that cuts the rolled material by rotating, a cover that covers the blade, and a fifth cooling mechanism that cools the blade,
The cover includes a drainage portion disposed on an inner surface opposite each surface of the blade.
Manufacturing method of rolled material.