JP5343546B2 - Thick steel plate rolling equipment and thick steel plate rolling method - Google Patents

Description

  The present invention relates to a thick steel plate rolling facility capable of shortening the rolling pass time without significantly modifying the rolling equipment such as mill descaling equipment and mill conveying equipment in so-called thick steel plate rolling, and The present invention relates to a method for rolling thick steel plates.

  Since the scale generated during hot rolling is harder than the material to be rolled, if it is rolled as it is, it will be hard to get into the material and scale wrinkles will be generated. In this case, the scale wrinkles are removed in the care process, and depending on the scale wrinkles, there is a case where the scale wrinkles are lost. For this reason, it is common to install a descaling header with multiple nozzles on the front and back surfaces or one side of the thick plate mill, spray high pressure water during the rolling pass, and remove the scale on the steel plate surface. It is. FIG. 3 shows an example of a mill descaling facility (Patent Document 1).

  The upper descaling header 2 is provided between the housing posts 7A of the thick plate mill 1, and the lower descaling header 3 is indicated at the center of the rolling mill (in FIG. 3, indicated as mil CL. Here, CL means a center line). The same shall apply hereinafter)) and is provided at a lower position between the feed roller 5 and the table roller 6 which are farthest from the above. Here, the feed roller refers to a roller supported by a bearing installed on the housing post. On the other hand, the table roller is installed outside the feed roller with respect to the center line of the rolling mill, and the bearing is supported separately from the rolling mill main body.

  In addition, each descaling header 2 and 3 is installed up and down across the pass line, and is connected to the high-pressure water supply pump. The high pressure water scatter prevention hood 12 is for preventing the high pressure water sprayed from the plurality of lower nozzles from being scattered around when the thick steel plate W is not directly above the lower descaling header 3. Yes, provided on the housing post 7 </ b> A of the plate mill 1.

In the manufacture of a thick steel plate, such a mill descaling facility may be used to roll 10 passes or more while injecting high-pressure water per thick steel plate W. In thick plate rolling, shortening the rolling pass time without significantly modifying the rolling equipment leads to an increase in production of thick plates, which is an important issue.
Japanese Patent Laid-Open No. 7-178440

However, the mill descaling facility described in Patent Document 1 has the following problems when attempting to move the lower descaling header 3 to a position close to the center of the rolling mill.
Hereinafter, problems of the conventional thick steel plate rolling equipment will be described.
2A is a plan view showing the position of the lower descaling header 3 installed in a conventional thick steel plate rolling facility, and FIG. 2B is an example of the lower nozzle 4 provided at the nozzle interval P. FIG. It is a top view which shows the injection pattern.

  The inner width A between the feed roller bearings 10 and 11 is narrower than the width dimension of the lower descaling header 3 corresponding to the maximum plate width, as shown in FIG. Therefore, the lower descaling header 3 is placed between the feed rollers 5 without changing the width dimension of the lower descaling header 3 (determined by the number of lower nozzles 4 and the nozzle interval P) and the shape of the feed roller bearings 10 and 11. When installed at the lower position, the high-pressure water sprayed from the lower nozzle 4 at the outermost side in the header width direction interferes with the inner portions of the feed roller bearings 10 and 11.

If such interference can be eliminated and the lower descaling header 3 can be installed at a position close to the center of the rolling mill, there is an effect in shortening the rolling pass time, leading to an increase in production.
Here, as shown in FIGS. 4A to 4C, the rolling pass time refers to the rolling start in which the leading end in the rolling direction of the thick steel plate W is positioned directly above the lower nozzle 4 that is spraying high-pressure water. From the previous time (FIG. 4 (a)), as shown in FIG. 4 (b), the difference in time from the time in the rolling direction of the thick steel plate W to the time of engagement until the engagement time of the upper and lower work rolls 8; Thereafter, as shown in FIG. 4 (c), it is given as the sum of the net rolling time for rolling to the tail end in the rolling direction of the thick steel plate W with the upper and lower work rolls while performing descaling by injecting high pressure water from the upper and lower nozzles. It is done. In FIG. 4, the high pressure water sprayed from the upper nozzle arranged in the upper descaling header is not shown, but the high pressure water sprayed from the upper nozzle is more than the high pressure water sprayed from the lower nozzle. Since it reaches the surface of the thick steel plate W at a position near the center, the rolling pass time is not affected.

That is, the rolling pass time is given by the sum of the time required for the steel plate W to be transported the distance L1 from the center of the lower nozzle to the center of the rolling mill and the net rolling time. If it can be installed close to the center of the rolling mill, the rolling pass time can be shortened.
Further, in the case of a reverse rolling mill, it is necessary to move the tail end of the material to be rolled immediately after rolling to a position farther from the mill than the lower descaling header on the immediately preceding pass exit side. This is because it is necessary to descal from the front end of the material to be rolled in subsequent passes. From this point of view, it is desired to install the lower descaling header at a position as close as possible to the center of the rolling mill.

  In view of the problems of conventional thick steel sheet rolling equipment, the present invention is capable of shortening the rolling pass time without significantly modifying the rolling equipment such as mill descaling equipment and mill conveying equipment. An object of the present invention is to provide a rolling facility and a method for rolling a thick steel plate.

As a result of intensive studies on the mill descaling equipment of the rolling mill, the present inventors have optimized the shape of the feed roller bearings on the operation side and the drive side, and without rolling the plate equipment, It was found that the pass time can be shortened, and the present invention has been made based on this finding.
That is, the present invention is as follows.
1. A plurality of table rollers, a plurality of feed rollers, a feed roller bearing that supports the plurality of feed rollers between the housing posts, a plurality of upper and lower nozzles, and a miller equipped with a lower descaling header. and scaling facilities, in a rolling steel plate comprising equipment, by shifting the feed roller bearing in the interference is not part of the Ha Ujinguposuto remote from the rolling mill center outward, between the feed roller bearings shifted to the outer the inner width of spread than the inner width between the feed roller bearing portion close to the mill center, and a feed roller which is supported by the feed rollers bearing shifted to the outer feed rollers bearing portion closer to the mill center is supported by, and feed that is supported by the feed rollers bearing shifted to the outer Downwardly between the feed roller adjacent to the over La, rolling equipment of steel plate, characterized in that it has established a lower descaling header.
2. 1. The cutout portion is formed on the inner surface of the feed roller bearing that interferes with the housing post . The thick steel plate rolling equipment described in 1.
3. Above 1. Or 2. A method for rolling thick steel plates, comprising rolling using the rolling equipment described in 1.

  According to the present invention, the feed roller bearing has been optimized in shape so that the lower descaling header is brought closer to the center of the rolling mill without significantly modifying the rolling equipment such as mill descaling equipment and mill transport equipment. It can be installed, and the rolling pass time can be shortened.

Hereinafter, the present invention will be described in detail.
Fig.1 (a) is a top view which shows the position of the lower descaling header 3 installed in the rolling equipment of the thick steel plate which concerns on this invention, FIG.1 (b) is the X section partial enlarged view.
In the case of this embodiment, the number of the plurality of feed rollers 5 is three, which are hereinafter referred to as No. 1, No. 2, and No. 3 feed rollers in order from the center of the rolling mill. As shown in FIG. 1 (a), the thick steel plate rolling facility according to the embodiment of the present invention includes a lower descaling header 3 in which a plurality of lower nozzles 4 are arranged as a No. 2 feed roller and a No. 2 feed roller. Since it is installed below the three feed rollers, the shapes of the feed roller bearings 10 and 11 that interfere with the high-pressure water sprayed from the lower nozzle 4 are optimized. That is, the feed roller bearings 10 and 11 on the operation side and the drive side are shifted from the center of the rolling mill and have no interference with the housing post 7A to the outside, and the bearing 14 built in the portion shifted to the outside Further, the distance between the operation side and the drive side is widened, and a planar shape is formed in which the inner width C of the part far from the rolling mill center is wider than the inner width A of the part near the rolling mill center.

Since the inner width C of the part away from the center of the rolling mill is the feed roller bearings 10 and 11 wider than the inner width A of the part near the center of the rolling mill, high-pressure water sprayed from the lower nozzle 4; The lower descaling header 3 can be installed below the No2 feed roller and the No3 feed roller without interference with the feed roller bearings 10 and 11.
In addition, it is preferable to form a notch 13 extending in the vertical direction on the inner surface of the portion shifted to the outside of the feed roller bearings 10 and 11.

  This is because the high-pressure water sprayed from the lower nozzle 4 toward the lower surface of the thick steel plate W inevitably has a slight spread of the water flow, and the high-pressure water sprayed toward the width edge portion of the material to be rolled. Although it is inevitable that a part of the roller will be in contact with the feed roller bearing, a notch 13 is formed on the inner surface of the portion shifted to the outside so as to extend vertically in the rolling direction notch dimension α and width direction notch dimension β. Therefore, even if the inner width C between the feed roller bearings 10 and 11 is not excessively widened, the high-pressure water sprayed from the lower nozzle 4 at the outermost side in the header width direction passes through the notch 13 from the bottom to the top. This is because the lower surface of the thick steel plate W can be reached. The position where the notch is provided may be determined according to the shape and arrangement of the lower descaling header and the nozzle. Preferably, the region includes an extended line of the nozzle row constituting the lower descaling header.

  For example, when 18 lower nozzles 4 having an injection angle θ in the injected high pressure water are arranged in the lower descaling header 3 with a nozzle interval P = 300 mm, the interval between the lower nozzles 4 on the outermost side in the header width direction is 5100 mm. (= (18-1) × P = 17 × 300). According to the lower descaling header 3 in which the interval between the lower nozzles 4 on the outermost side in the header width direction = 5100 mm, the injection angle θ = 15 degrees, and the nozzle interval P = 300 mm, it corresponds to a thick steel plate having a plate width of about 5400 mm. Is possible.

In that case, on the inner surfaces of the operation-side and drive-side feed roller bearings 10 and 11 that are shifted outward, a notch extending in the vertical direction with a notch dimension α = 100 mm in the rolling direction and a notch dimension β = 100 mm in the width direction is provided. The part 13 can be formed.
Other than that, it is the same structure as the rolling equipment of the conventional thick steel plate shown to Fig.2 (a) and FIG.

In the case of the conventional thick steel plate rolling equipment, the lower descaling header 3 is installed below the No. 3 feed roller and the table roller 6 away from the center of the thick plate rolling mill. The distance L1 to the center was 2845 mm (see FIG. 2A).
On the other hand, in the case of the thick steel plate rolling equipment of the present invention, the distance L2 from the center of the lower nozzle to the center of the rolling mill can be set to 2210 mm by optimizing the shapes of the operation-side and drive-side feed roller bearings. Compared to the conventional case, the lower descaling header 3 can be placed close to the center of the rolling mill by 635 mm (= L1-L2) corresponding to one feed roller (see FIG. 1A). ).

As a result, in a rolling pass in which the leading end in the rolling direction of the thick steel plate is positioned immediately above the lower nozzle that is spraying high-pressure water, and then the leading end in the rolling direction of the thick steel plate is engaged with the upper and lower work rolls by a plurality of feed rollers. As a result, the rolling pass time can be shortened by the time required to convey the thick steel plate by 635 mm, and the production of the thick plate can be increased.
In the present specification, the installation position of the lower descaling header on one side of the rolling mill has been described above. However, if this technology is applied to a reverse type rolling mill, the lower descaling header on both sides of the rolling mill is removed from the rolling mill. It can be brought close to the center line, and a great effect can be obtained in improving the production efficiency. That is, when the present technology is applied to a reverse rolling mill, not only can the time from the state before rolling to the work roll biting be shortened, but also the lower end of the material to be rolled is lowered after one pass of rolling. Since the distance to be moved to a position far from the rolling mill center line becomes shorter than the descaling header, it contributes to shortening the total rolling time.

(A) is a top view which shows the position of the lower descaling header installed in the rolling equipment of the thick steel plate of this invention, (b) is the X section partial enlarged view. (A) is a top view which shows the position of the lower descaling header installed in the rolling equipment of the conventional thick steel plate, (b) is a top view which shows the injection pattern of an example of a lower nozzle. It is a side view which shows the structure of the rolling equipment of the conventional thick steel plate. It is process drawing explaining the problem at the time of using the rolling equipment of the conventional thick steel plate.

Explanation of symbols

W Thick Steel Plate 1 Thick Mill 2 Upper Descaling Header 3 Lower Descaling Header 4 Lower Nozzle 5 Feed Roller 6 Table Roller 7A, 7B Housing Post 8 Work Roll 9 Backup Roll
10, 11 Feed roller bearing
12 High pressure water splash prevention hood
13 Notch
14 Bearing α Notch dimension in rolling direction β Notch dimension in width direction P Nozzle spacing L1, L2 Distance from lower nozzle center to rolling mill center A, C Inner width B Housing post spacing

Claims (3)

A plurality of table rollers, a plurality of feed rollers, a feed roller bearing that supports the plurality of feed rollers between the housing posts, a plurality of upper and lower nozzles, and a miller equipped with a lower descaling header. and scaling facilities, in a rolling steel plate comprising equipment, by shifting the feed roller bearing in the interference is not part of the Ha Ujinguposuto remote from the rolling mill center outward, between the feed roller bearings shifted to the outer the inner width of spread than the inner width between the feed roller bearing portion close to the mill center, and a feed roller which is supported by the feed rollers bearing shifted to the outer feed rollers bearing portion closer to the mill center is supported by, and feed that is supported by the feed rollers bearing shifted to the outer Downwardly between the feed roller adjacent to the over La, rolling equipment of steel plate, characterized in that it has established a lower descaling header. 2. The thick steel plate rolling equipment according to claim 1, wherein a notch is formed in an inner surface of the feed roller bearing that interferes with the housing post .   A method for rolling thick steel plates, comprising rolling using the rolling equipment according to claim 1 or 2.

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