JP4924475B2 - Hot leveler and double tube - Google Patents

Description

  The present invention relates to a hot leveler equipped with a descaling mechanism and suitable for thick plates.

  When a thick steel plate is straightened with a hot leveler, a part of the scale formed on the surface of the thick steel plate after hot rolling until the start of leveling peels off from the surface of the thick steel plate, and the surface of the upper and lower leveling rolls and the thick steel plate May cause surface defects.

  FIG. 3 is a diagram for explaining the correction work by the hot leveler, and the plate material (thick steel plate) 18 is repeatedly bent while passing between the upper leveling rolls 17a to 17e and the lower leveling rolls 16a to 16e.

  The steel plate reaction force (contact surface pressure) during straightening was measured using the upper leveling roll No. When two-dimensional elasto-plastic contact analysis is performed by FEM for each, the first and third passes of the plate are No. 3 rolls, 2nd pass is No. The contact surface pressure (correction reaction force) is increased with 4 rolls, and a large number of avatars tend to be generated in the rolls.

  When an avatar is generated on the upper leveling roll, it is transferred to the surface of the steel sheet, resulting in poor quality. Therefore, it has been proposed to remove the scale peeled off during the leveling from the hot leveler to prevent the occurrence of the avatar.

  Patent Document 1 discloses a high-pressure fluid (water or air) in the roll axis direction at least at one place between the adjacent upper leveling rolls in the hot leveler body and in the front row with respect to the steel sheet entering direction and between the lower leveling rolls. ), And a hot leveler provided with a descaling device that blows away the peeled scale is described.

Patent Document 2 provides a pressurized air supply header between adjacent correction rolls, and attaches a plurality of nozzles that inject air at a predetermined inclination angle toward the material to be corrected in the roll axis direction of the correction rolls. A scale excluding device for blowing off the peeled scale is described.
Japanese Unexamined Patent Publication No. 63-101018 JP 2001-471132 A

  By the way, as shown in FIG. 4, the hot leveler supports the plate material 18 at three points by an upper leveling roll 17 and a lower leveling roll (not shown in the figure), and corrects bending and warping by repeated reduction, so The space between the leveling rolls is limited, and further, by providing a backup roll 19 above the upper leveling roll 17, the empty space 20 is a very narrow area (for example, height h: 65 mm, width w: about 100 mm). ).

  Further, the empty space 20 needs to be provided with a cooling water jetting mechanism for roll cooling, and it is not easy to attach the scale removing device to an existing hot leveler, and even when a new hot leveler is manufactured, there are restrictions. There are many.

  However, Patent Documents 1 and 2 do not describe a scale removing device that can be easily installed even in a narrow space by effectively using the empty space 20.

  Therefore, an object of the present invention is to provide a hot leveler having a descaling mechanism that can be easily attached even in a narrow space between upper and lower leveling rolls, and a piping structure suitable for use in the descaling mechanism.

The object of the present invention can be achieved by the following means.
1. A hot leveler comprising: a descaling mechanism that removes a scale separated during leveling from a surface of a rolled material by injecting a high-pressure fluid; and a roll outer periphery cooling pipe that supplies cooling water for cooling the outer periphery of the roll, The descaling mechanism includes a descaling high-pressure fluid supply pipe disposed at every adjacent roll interval, and a plurality of high-pressure fluid injection nozzles provided in a pipe axis direction of the descaling high-pressure fluid supply pipe. A hot leveler characterized in that the high-pressure fluid supply pipe for scaling and the pipe for cooling the outer periphery of the roll have a double pipe structure in which a part of one pipe outer wall becomes a part of the other pipe inner wall.
2. 2. The hot leveler according to 1, wherein one of the double pipes is a descaling high-pressure fluid supply pipe, and the other pipe is a roll outer periphery cooling pipe.
3. A double structure characterized in that a part of the outer surface of the descaling high-pressure fluid supply pipe is integrated with a part of the inner surface of the roll outer periphery cooling pipe for supplying cooling water for cooling the outer periphery of the roll. tube.

  According to the present invention, it is easy to provide a descaling mechanism in a new or existing hot leveler, which is extremely useful in the industry.

  The present invention is characterized in that the descaling mechanism high pressure fluid supply pipe is combined with the roll outer periphery cooling pipe to improve the space efficiency between the upper rolls.

  FIG. 1 is a schematic view of a duplexer in which a high-pressure fluid supply pipe for descaling of a descaling mechanism and a pipe for cooling the outer circumference of a roll for supplying cooling water for cooling the outer circumference of a roll are integrated in a hot leveler according to an embodiment of the present invention. A cross-sectional view of the tube in the direction perpendicular to the tube axis is shown, and FIG. 2 is an oblique external view of the double tube.

  In these figures, 1 is a double pipe, 11 is a roll outer periphery cooling pipe, 12 is a descaling high-pressure fluid supply pipe, 13 is a descaling high-pressure fluid injection nozzle, and 14 and 14a are on the roll outer periphery cooling pipe 11. The provided roll outer periphery cooling water jet nozzle, 15 and 15a are roll cooling jet water, and 17 is a descaling high-pressure fluid.

  In the double pipe 1, the distance e between the center position a of the roll outer periphery cooling pipe 11 and the center position b of the descaling high pressure fluid supply pipe 12 is such that the outer diameter Y1 of the roll outer periphery cooling pipe 11 and the descaling high pressure. The outer diameter Y2 of the fluid supply pipe 12 is smaller than the sum of the outer diameters Y2, and a part of the outer surface of the descaling high-pressure fluid supply pipe 12 is configured to be a part of the inner surface of the roll outer periphery cooling pipe 11.

  A descaling high-pressure fluid injection nozzle 13 is attached to the descaling high-pressure fluid supply pipe 12 so that the high-pressure fluid ejected from the nozzle port blows off the peeled scale.

  In addition, roll outer periphery cooling water ejection nozzles (for example, flat pattern nozzles) 14 and 14a are attached to the roll outer periphery cooling pipe 11 so as to cool the leveling roll.

  The illustrated double pipe 1 has high pressure fluid 17 ejected from a descaling high pressure fluid ejection nozzle 13 vertically downward, roll cooling water 15 and 15a ejected from roll outer periphery cooling water ejection nozzles 14 and 14a, and high pressure. A case is shown in which the fluid 17 is configured to be directed obliquely downward and outward in the vertical direction so as to sandwich the fluid 17 from the left and right.

  When the outer diameter Y1 of the roll outer periphery cooling pipe 11 exceeds the outer diameter Y2 of the descaling high pressure fluid supply pipe 12, the roll cooling water ejected from the roll outer periphery cooling water ejection nozzles 14 and 14a is supplied with the descaling high pressure fluid supply. This is preferable because it does not interfere with the pipe 12.

  In the double pipe 1, the distance e between the center position a of the roll outer periphery cooling pipe 11 and the center position b of the descaling high-pressure fluid supply pipe 12 is equal to the outer diameter Y1 of the roll outer periphery cooling pipe 11 and the descaling. As long as it is smaller than the sum of the outer diameters Y <b> 2 of the high pressure fluid supply pipe 12, a part of the inner surface of the descaling high pressure fluid supply pipe 12 may be a part of the outer surface of the roll outer periphery cooling pipe 11. .

  However, the outer diameter Y1 of the roll outer periphery cooling pipe 11 is set to the descaling high-pressure fluid supply pipe so that the scale from which the high-pressure fluid 17 is peeled is blown out of the apparatus and the roll cooling water 15 and 15a cools the leveling roll. It is preferable that the outer diameter is 12 or more.

  The double pipe 1 has two pipes that are concentrically doubled, and the pipe axis is offset. Therefore, the section modulus is large, the longitudinal rigidity is improved, and bending due to its own weight occurs. Few.

  Further, in contrast to the case where the two pipes are configured so that the pipe walls are in contact with each other, the arrangement is easy even in a narrow space.

  In the hot leveler in which the pipe for cooling the outer periphery of the roll and the high pressure fluid supply pipe for descaling have the above-described structure, the vertical rigidity of the double pipe 1 is improved, so that collision with the leveling roll and the material to be corrected is avoided. Is done.

  In addition, an integrated double pipe structure roll outer periphery cooling pipe and descaling high-pressure fluid supply pipe are installed between the leveling rolls, and by injecting the roll outer periphery cooling water and descaling high-pressure water during leveling, The peeled scale is removed from the plate material surface, and the scale attached to the leveling roll is removed.

  This prevents the scale from biting between the leveling roll and the plate material, and prevents wrinkles from occurring on the plate material surface and the leveling roll surface. As a result, it is possible to reduce the occurrence of defective products and improve productivity.

  Although the above description has been given of the case where the roll outer periphery cooling pipe and the descaling high-pressure fluid supply pipe are circular pipes, the pipe is not limited to the circular pipe.

  Either or both of the roll outer periphery cooling pipe and the descaling high-pressure fluid supply pipe can be applied, for example, even if they are square pipes. Moreover, although the case where the double pipe 1 was comprised with the pipe | tube for roll outer periphery cooling and the high pressure fluid supply piping for descaling was demonstrated, it is not limited to these.

  The distance between the center position a of the roll outer periphery cooling pipe 11 and the center position b of the descaling high pressure fluid supply pipe 12 is about 20 mm, and the roll outer periphery cooling pipe 11 of 40A_sch 40 and the descaling high pressure fluid supply pipe 12 of 25A_sch 40 are used. The double tube 1 shown in FIG.

  As a result, it was possible to arrange them in an empty space having a height h between the leveling rolls of 65 mm and a width of w of 100 mm.

  Further, the bending amount of the double pipe 1 is about 7 mm, and is reduced by about 30% with respect to the bending amount of about 10 mm of the conventional piping structure in which the roll outer periphery cooling pipe 11 and the descaling high-pressure fluid supply pipe 12 are separated from each other. It was done. When the roll outer periphery cooling pipe 11 and the descaling high-pressure fluid supply pipe 12 are arranged apart from each other, it is impossible to arrange both pipes in the empty space.

  Moreover, as a result of arranging the double pipe 1 in the empty space between the leveling rolls and operating it, the defect rate due to the occurrence of avatar flaws in the hot leveler is the occurrence of avatar flaws in the conventional equipment in which only the pipe for cooling the outer periphery of the roll is arranged. A significant reduction of 86% was achieved compared to the defect rate due to.

In a hot leveler according to one embodiment of the present invention, a double-tube tube shaft in which a high-pressure fluid supply pipe for descaling of a descaling mechanism and a pipe for cooling the outer circumference of a roll for supplying cooling water for cooling the outer circumference of the roll are integrated. It is sectional drawing of an orthogonal direction. It is a diagonal external view of the double pipe | tube shown in FIG. It is a figure explaining the correction work by a hot leveler. It is a figure explaining the empty space of a leveling roll of a hot leveler.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Double pipe 11 Roll outer periphery cooling piping 12 Descaling high pressure fluid supply piping 13 Descaling high pressure fluid injection nozzle 14, 14a Roll outer periphery cooling water ejection flat pattern nozzle 15, 15a Roll cooling ejection water 16a, 16b, 16c, 16d, 16e Lower leveling roll 17 High pressure fluid for descaling 17a, 17b, 17c, 17d, 17e Upper leveling roll 18 Plate material 19 Backup roll 20 Empty space

Claims (3)

  A hot leveler comprising: a descaling mechanism that removes a scale peeled during leveling from a surface of a rolled material by jetting a high-pressure fluid; and a roll outer periphery cooling pipe that supplies cooling water for roll outer periphery cooling, The descaling mechanism includes a descaling high-pressure fluid supply pipe disposed at every adjacent roll interval, and a plurality of high-pressure fluid injection nozzles provided in a pipe axis direction of the descaling high-pressure fluid supply pipe. A hot leveler characterized in that the high-pressure fluid supply pipe for scaling and the pipe for cooling the outer periphery of the roll have a double pipe structure in which a part of one pipe outer wall becomes a part of the other pipe inner wall.   2. The hot leveler according to claim 1, wherein one pipe of the double pipe structure is a descaling high-pressure fluid supply pipe, and the other pipe is a roll outer periphery cooling pipe.   A double structure characterized in that a part of the outer surface of the descaling high-pressure fluid supply pipe is integrated with a part of the inner surface of the roll outer periphery cooling pipe for supplying cooling water for cooling the outer periphery of the roll. tube.

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