JP2010240660A - Descaling device in hot rolling line, descaling method for material to be rolled in hot rolling, and method for manufacturing hot-rolled metal strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a descaling device in a hot-rolling line capable of preventing problems of break or the like of a support mechanism or a hose from occurring due to deformation of a flexible hose when the descaling device is lifted or lowered corresponding to variation of thickness or warp of a material to be rolled, and also to provide a descaling method for the material to be rolled in hot rolling, and further to provide a method for manufacturing a hot-rolled metal strip. <P>SOLUTION: Pipes 4 for supplying water toward upper descaling headers 3 are made bendable through swivel joints 4a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a descaling apparatus in a hot rolling line, a descaling method for a material to be rolled in hot rolling, and a method for producing a hot rolled metal strip.

  As an example, the case of a hot strip rolling line 100 as shown in FIG. 5 is taken as an example.

  Hot rolling is generally a hot rolling line after heating a slab-like metal material produced by continuous casting, ingot-making, or ingots to several hundred to several hundreds of degrees Celsius in a heating furnace. It is a series of processes that are extracted upward and rolled thinly by rotating the roll while being pinched by a pair or a plurality of pairs of rolls, and winding it into a coil.

  A metal material (hereinafter, material to be rolled) 8 having a thickness of 150 to 300 mm heated to several hundred to several hundreds of degrees Celsius by the heating furnace 10 is rolled to a thickness of 1.2 to 25 mm by a roughing mill 12 and a finishing mill 18. After being thinly extended into a metal plate (metal strip) shape and cooled by the cooling facility 26, it is wound up in a coil shape by a coiler (winding device) 24.

  The table roll 7 conveys the material to be rolled 8 between the rolling mills except between the rolling mills constituting the finish rolling mill 18. The table roll 7 between the finishing mill 18 and the coiler 24 is particularly called a run-out table 23.

  14 is a crop shear and 1 is a descaling device. In addition, various sensors for measuring the temperature, dimensions (thickness, width), shape, and the like of the material 8 to be rolled are installed at various locations in the hot rolling line 100. 50 is a control device, 70 is a process computer, and 90 is a business computer.

  FIG. 6A schematically shows a front view of the descaling apparatus 1. From the nozzles 2 arranged in the width direction of the material to be rolled, high pressure water of 10 to 60 MPa is jetted as a pressure when discharged from a pump (not shown). Although only the upper side is shown as a representative, nozzles 2 are also arranged in the lower side in the width direction of the material to be rolled.

  Since the water sprayed from the nozzle 2 spreads away from the nozzle 2, especially the upper nozzle 2 is designed to be a table roller by design so that a wrap region d having an appropriate range of 10 to 150 mm is usually formed. The height of the nozzle 2 is determined from a virtual line (pass line PL) formed by connecting the seven vertices.

  And considering the maximum and minimum thickness of the material 8 to be rolled, any thickness of the material 8 to be rolled is suitable for the water sprayed from the adjacent nozzle 2 on the surface of the material 8 to be rolled. I want to create a wrap region d with a range length.

  However, in the case of the descaling apparatus 1 on the entrance side of the finishing mill 18, the thickness of the material 8 to be rolled is 60 mm at the maximum, 20 mm at the minimum, and the difference is only 40 mm at most. In the case of the descaling apparatus 1 on the exit side of the furnace 10, as shown in FIG. 6B, the difference is 200 mm at the maximum, 300 mm at the maximum, and 100 mm at the minimum.

  Therefore, as the maximum and minimum intervals of the thickness of the material to be rolled 8 become wider, the water sprayed from the adjacent nozzle 2 on the surface of the material to be rolled 8 is the surface of the material to be rolled 8 regardless of the thickness of the material to be rolled 8. Therefore, it is difficult to design the wrap region d in an appropriate range.

  The water sprayed from the adjacent nozzles 2 is strictly as shown in the front view shown in FIG. 7A and the plan view shown in FIG. Are jetted with a turning angle α of 10 to 20 °, so that even if a lap region d is formed when viewed from the front, they usually do not interfere with each other directly.

  However, if the wrap region d becomes too large, high-pressure water interferes on the material 8 to be rolled, resulting in poor scale peelability, and even if the wrap region d becomes too small, the scale peelability also deteriorates. From the above, the larger the difference between the maximum and minimum thicknesses of the material 8 to be rolled that passes under the descaling apparatus 1 in question, the more appropriate the wrap region d in the water sprayed from the adjacent nozzle 2. It becomes difficult to design for it.

  Moreover, even if the thickness is constant over the entire length of the material 8 to be rolled, when viewed in the longitudinal direction of the material 8 to be rolled, as shown in FIG. In such a case, due to the same reason as described above, in the region where no warp occurs, as shown in FIG. When the region d is formed and the rolled material 8 is viewed from above in plan view, as shown in FIG. 8 (d), good descaling property can be obtained over the entire surface of the rolled material 8, but warpage occurs. In the region where the material to be rolled 8 is viewed in the width direction, as shown in FIG. 8 (e), the wrap region d cannot be formed or deviated from an appropriate range, and the material to be rolled 8 is flattened. When viewed from above, as shown in FIG. 8 (f), part of the entire surface of the material to be rolled 8 has good descaling. Sex or not obtained, a problem that occurs.

  In patent document 1 and patent document 2, it proposes raising / lowering the piping which arranged the nozzle 2 called the descaling header 3 in the descaling apparatus 1 according to the fluctuation | variation of the thickness of the material 8 to be rolled. ing.

  Patent Document 1 does not clarify the specific mechanism, but Patent Document 2 supplies high-pressure water to the descaling header 3 via the flexible hose 5 as shown in FIG. Has proposed. Reference numeral 6 denotes a vertical movement device.

JP-A-63-068213 JP 05-228526 A

  However, a high pressure is applied to the flexible hose 5 while high pressure water is being discharged from a pump (not shown), and at this time, the flexible hose 5 tends to be extended. When the pump stops, the internal pressure is almost lost, and the flexible hose 5 bends.

  The design of the mechanism that supports the flexible hose 5 that stretches and bends becomes a problem. However, Patent Document 2 does not mention anything about this.

  That is, if a strong support mechanism is not provided, the support mechanism may be destroyed when the flexible hose 5 tries to extend, and even if a strong support mechanism is provided. When trying to extend the flexible hose 5 by applying a high pressure to the pin and forcibly bending it, there arises a problem that the flexible hose 5 is broken.

  The present invention has been made to solve such problems of the prior art, and even when the descaling device is moved up and down in accordance with the thickness variation and warpage of the material to be rolled, Providing a descaling device in a hot rolling line, a method for descaling a material to be rolled in hot rolling, and a method for producing a hot rolled metal strip, which can prevent problems such as breakage of a support mechanism and a hose The purpose is to do.

That is, the present invention is as follows.
(1) A descaling header which is provided across the width direction of the material to be rolled up and down across the material to be rolled conveyed by rotating the table roll, and nozzles are arranged in the width direction of the material to be rolled. A descaling device in a hot rolling line comprising: a pipe for supplying water for spraying from the nozzle toward the descaling header; and a vertical movement device for raising and lowering the descaling header on the upper side. ,
A descaling apparatus in a hot rolling line, wherein a pipe for supplying water toward the descaling header on the upper side is bendable through a swivel joint.
(2) A row of descaling headers provided across the width direction of the material to be rolled up and down across the material to be rolled toward the upper and lower surfaces of the material to be rolled conveyed by rotating the table roll. In the method for descaling the material to be rolled in hot rolling, the scaled material is descaled by spraying water from the nozzle that has been made,
By making the pipe for supplying water toward the descaling header on the upper side bendable via a swivel joint, the height of the nozzle is made variable, and depending on the thickness and / or warpage of the material to be rolled The height from the upper surface of the material to be rolled to the nozzle so that the length of the wrap region of water sprayed from the adjacent nozzle on the surface of the material to be rolled falls within an appropriate range. A method for descaling a material to be rolled in hot rolling, characterized by adjusting.
(3) A method for producing a hot-rolled metal strip using the method of (2).

  According to the present invention, even when the descaling device is raised and lowered according to the thickness variation and warpage of the material to be rolled, problems such as breakage of the support mechanism and the hose occur as in the case of the flexible hose. It is possible to provide a descaling device in a hot rolling line, a descaling method for a material to be rolled in hot rolling, and a method for producing a hot rolled metal strip.

The diagram for explaining one embodiment of the present invention Diagram for explaining the operation of the present invention Diagram for explaining another embodiment of the present invention Diagram for explaining the effect of the present invention Diagram for explaining an example of a hot rolling line Diagram for explaining the prior art Diagram for explaining how to install nozzles Diagram for explaining the prior art Diagram for explaining the prior art

  (Embodiment of First Invention) FIG. 1 shows a descaling apparatus in a hot rolling line according to an example of an embodiment of the first invention. The case where the present invention is applied to the descaling apparatus 1 on the most upstream side of the hot rolling line 100 shown in FIG.

  The descaling device 1 in the hot rolling line according to an example of the first embodiment of the present invention shown in FIG. 1 moves up and down across the material to be rolled 8 conveyed by rotating the table roll 7. The descaling header 3 provided in the width direction of the material 8 to be rolled, and the nozzles 2 arranged in the width direction of the material 8 to be rolled, and a pipe for supplying water for spraying from the nozzle 2 toward the descaling header 3 4 and an up-and-down moving device 6 for raising and lowering the upper descaling header 3, for example, in the descaling device 1 in the hot rolling line 100 described with reference to FIG. 5, the upper descaling header 3 is characterized in that the pipe 4 for supplying water toward the pipe 3 can be bent via a swivel joint 4a.

  The upstream side of the pipe 4 connected to the swivel joint 4a, that is, the side opposite to the nozzle 2 is connected to a pump (not shown). Reference numeral 3a denotes a wiper that serves to scoop off excess water on the material 8 to be rolled.

  As shown in FIG. 2 (a), the swivel joint 4a is bent or stretched even when the rolled material 8 is thick or even when the rolled material 8 is thin as shown in FIG. 2 (b). In order to form a lap region d having an appropriate length and the same length in the water sprayed from the adjacent nozzle 2 on the surface of the material 8 to be rolled, the pass line PL The most preferable method for obtaining the effect of the present invention is to adjust the height of the nozzle 2 from the nozzle to a constant level.

  (Second Embodiment of the Present Invention) The descaling device 1 on the entry side of the width press 9 is the device configuration of the descaling device 1 according to the first embodiment of the present invention described above, and the upper side By making the piping 4 for supplying water toward the descaling header 3 bendable via a swivel joint 4a, the height of the nozzle 2 can be made variable, and the individual material to be rolled 8 conveyed one after another. Depending on the thickness of the material to be rolled, the height from the upper surface of the material to be rolled 8 to the nozzle 2 is appropriate, and the length d of the wrapping region of water sprayed from the adjacent nozzle 2 on the surface of the material to be rolled 8 is appropriate. Adjust to be within range.

  As shown in FIG. 3A, a warp amount sensor 17 (which can be configured with a laser distance meter or the like) that measures the warp amount of the material 8 to be rolled conveyed in the conveyance direction A by rotating the table roll 7. In addition, the control device 50 captures a pulse from a pulse generator PG that generates a pulse each time the table roll 7 rotates a certain circumference, and the process material 70 conveys the material 8 to be rolled directly under the descaling device 1. The thickness of the material to be rolled at that time is sent to the control device 50 as data.

  As shown in FIG. 3 (b), the control device 50 first waits at a sufficiently high position toward the vertical movement device 6, and the point when the tip of the material 8 to be rolled reaches directly below the warpage sensor 17. Then, at the height H where the warp is generated from the pass line PL, the wrap region d having an appropriate length when viewed in the width direction of the material to be rolled 8 in the water sprayed from the adjacent nozzle 2 is A command is given to move the tip of the nozzle 2 to a height including the possible height h, and the material to be rolled 8 is a distance D from directly below the warpage sensor 17 to just below the exit nozzle 2 of the two. Is conveyed from the upper surface of the material 8 to the nozzle 2 in accordance with the change in the amount of warpage in the longitudinal direction of the material 8 to be always sprayed from the adjacent nozzle 2. When viewed in the width direction of the material 8 to be rolled, there is a wrap region d having a length in an appropriate range. To be maintained that the height h, with distance to be transported in the rolled material 8, the position of the nozzle 2 is gradually controlled so it descends.

  According to the method of the second aspect of the present invention, even when the descaling device is moved up and down in accordance with the thickness variation and warpage of the material to be rolled, the support mechanism and the hose are In addition to preventing problems such as tearing, it is possible to prevent the problem that good descalability cannot be obtained for a part of the entire surface of the material 8 to be rolled.

  As described above, the present invention is not limited to the embodiment described above. That is, in the embodiment described above, the case where the present invention is applied to the descaling apparatus 1 on the most upstream side of the hot rolling line 100 shown in FIG. However, the present invention is not limited to this, and can be applied to the descaling apparatus 1 in every place from the zone where the width press 9 and the rough rolling mill 12 are located to the zone on the entrance side of the finishing mill 18.

  In the above-described embodiment, the case where the descaling apparatus 1 having two pairs of descaling headers is used as an example. However, the present invention is not limited to this, and the descaling header is The present invention can also be applied when there are only one pair or three or more pairs.

  The descaling device 1 on the entry side of the width press 9 is the device configuration of the descaling device 1 according to the first embodiment of the present invention described above, and 20 mm is set as a wrap region d having an appropriate length. When the height h can be 260 mm and the thickness of the material 8 to be rolled is 300 mm and 260 mm, the operation is performed for one month as in the second embodiment of the present invention. As shown in FIG. 2, conventionally, the descaling failure has occurred at a rate of 1%, and is zero when the present invention is applied.

DESCRIPTION OF SYMBOLS 1 Descaling apparatus 2 Nozzle 3 Descaling header 3a Wiper 4 Piping 4a Swivel joint 5 Flexible hose 6 Vertical movement apparatus 7 Table roll 7a Motor 8 Rolled material 9 Width press 10 Heating furnace 12 Rough rolling mill 13 Edger roll 14 Crop shear DESCRIPTION OF SYMBOLS 15 Finishing side thermometer 18 Finishing rolling mill 19 Work roll 19A Backup roll 20 Looper 21 Finishing side thermometer 22 Finishing side thickness gauge 23 Runout table 24 Coiler 25 Coiler inlet side thermometer 26 Cooling equipment 50 Control apparatus 70 Process computer 90 Business computer 100 Hot rolling line A Conveying direction d Lapping area PL Pass line PG Pulse generator

Claims (3)

A descaling header provided across the width direction of the material to be rolled up and down across the material to be rolled conveyed by rotating the table roll, and a nozzle arranged in the width direction of the material to be rolled, In a descaling apparatus in a hot rolling line comprising a pipe for supplying water for spraying from the nozzle toward the descaling header, and a vertical movement device for raising and lowering the descaling header on the upper side,
A descaling apparatus in a hot rolling line, wherein a pipe for supplying water toward the descaling header on the upper side is bendable through a swivel joint. Nozzles arranged in a descaling header provided across the width direction of the material to be rolled up and down across the material to be rolled toward the upper and lower surfaces of the material to be rolled conveyed by rotating the table roll. From the method of descaling the material to be rolled in hot rolling, by descaling the material to be rolled by spraying water,
By making the pipe for supplying water toward the descaling header on the upper side bendable via a swivel joint, the height of the nozzle can be made variable, depending on the thickness and / or warpage of the material to be rolled. The height from the upper surface of the material to be rolled to the nozzle so that the length of the wrap region of water sprayed from the adjacent nozzle on the surface of the material to be rolled falls within an appropriate range. A method for descaling a material to be rolled in hot rolling, characterized by adjusting. A method for producing a hot-rolled metal strip using the method according to claim 2.

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