JP4613385B2 - Vertical strip steel roll - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a roll for vertical stripe steel plates, and more specifically, for vertical stripe steel plates suitable for hot rolling production of vertical stripe steel plates having a plurality of protrusions in the longitudinal direction that are often used as civil engineering and building materials. Regarding roles.
[0002]
[Prior art]
The vertically striped steel plate has a plurality of protrusions parallel to the longitudinal direction of the plate on one side, and is widely used as a civil engineering and building material. For example, a vertically striped steel plate as a material for spiral steel pipes for civil engineering is a concrete anchor in which the ridges are filled into the pipe by arranging the ridges on the inner surface of the pipe and making spiral pipes. Strengthen the adhesion of concrete to the inner wall of the pipe.
[0003]
The vertically striped steel plate is manufactured by rolling down a hot-rolled mother plate having flat surfaces on both sides using a caliber roll for forming ridges as an upper roll and a flat roll as a lower roll at the final stand of hot continuous rolling.
The said caliber roll has the caliber area (area | region where a roll surface makes an unevenness | corrugation) used as the female type | mold of a protrusion part in the center part of rolling width, and has a flat area | region (area | region where a roll surface is flat) on the both sides. For this reason, if there is a large difference in rolling reduction between the caliber area and the flat area, the product will grow in the ears and belly.
[0004]
As means for preventing the occurrence of such ear elongation and belly elongation, Japanese Patent Application Laid-Open No. 10-272501 discloses a ratio (r _m / r) between the average roll radius (r _m ) of the caliber region and the roll radius (r ₂ ) of the flat region. ₂ ) A vertically striped steel sheet roll having 0.98 to 1.02 is shown (see FIG. 2).
[0005]
[Problems to be solved by the invention]
However, in the caliber roll 1 described in JP-A-10-272501, as shown in FIG. 3, when the maximum roll radius r _{0 in} the caliber area is larger than the roll radius r ₂ in the flat area, the flat area is backed up during rolling. There was a problem that the repeated bending force 7 to the roll 2 side acted, and the cracks 5 and cracks 6 due to rolling fatigue were generated at the end of the caliber region that became the fulcrum of the repeated bending. In addition, in FIG. 3, 3 is a flat roll (lower roll), 4 is a steel plate (vertically striped steel plate).
[0006]
An object of the present invention is to provide a roll for a vertically striped steel sheet that solves the above-described problems and that can prevent the occurrence of ear elongation and belly stretch of the vertically striped steel sheet and can prevent damage due to rolling fatigue at the end of the caliber.
[0007]
[Means for Solving the Problems]
The present invention has a main caliber region in which convex portions having a roll radius r ₀ and concave portions having a roll radius r ₁ (<r ₀ ) are alternately arranged at the center in the roll axial direction, and both outer sides of the main caliber region. Vertical stripes characterized by having a secondary caliber area where roll radius r ₂ : 1.00 < r ₀ / r ₂ ≦ 1.02 and a flat area of roll radius r ₀ which is continuous on both outer sides of the secondary caliber area It is a roll for steel plates.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing an embodiment of the present invention. As shown, the present invention has a main caliber zone 10 and a recess 9 is disposed alternately convex portion 8 and the roll radius r ₁ of the roll radius r ₀ in the roll axial direction central portion _{(<r 0)} , Roll radius r ₂ connected to both outer sides of the main caliber region 10: a sub-caliber region 11 satisfying 1.00 < r ₀ / r ₂ ≦ 1.02, and a roll radius r ₀ connected to both outer sides of the sub-caliber region 11. This is a roll 20 for a vertically striped steel sheet having a flat region 12.
[0009]
In the present invention, since the secondary caliber region 11 having the roll radius r ₂ : 1.00 < r ₀ / r ₂ ≦ 1.02 is provided on both outer sides of the main caliber region 10, the reduction ratio of the width center portion and the width end portion of the steel plate is achieved. A large difference does not occur, and therefore it is possible to prevent the occurrence of ear extension and belly extension. Furthermore, in the present invention, since the flat area 12 with the roll radius r ₀ is connected to both the outer sides of the auxiliary caliber area 11, the flat area 12 comes into contact with the backup roll and restrains deformation in the vertical direction. The bending force does not act repeatedly outside the area 10. Therefore, rolling fatigue does not occur at the end of the main caliber region 10, and it is possible to prevent the occurrence of chipping or cracks at this portion.
[0010]
The width of the secondary caliber area 11 (meaning the length in the roll axis direction, hereinafter the same) is preferably the minimum necessary in consideration of the sum of the necessary ear allowance and the meandering allowance, and the width of the flat area 12 is preferably increased as much as possible. Further, in order to ensure the peak height of the steel sheet ridges, roll radius r ₂ of the sub-caliber area 11, and _{1.00 <r 0 / r 2 ≦} 1.02.
[0011]
【Example】
Conventionally, vertical striped steel sheets were manufactured by applying the roll 1 for vertical striped steel sheets shown in FIG. 3 to the upper roll of a finishing mill final stand of a hot rolling line. Instead of the conventional roll 1 for vertical stripe steel plate, the roll 20 for vertical stripe steel plate of the present invention shown in FIG. 1 was applied to carry out the present invention. In this example, the peak height (r ₀ -r ₁ ) of the unevenness was 3 to 5 mm, and the size of the auxiliary caliber region 11 was 100 mm in width and r ₀ / r ₂ = 1.01. As a result, it is possible to manufacture vertically striped steel plates that do not have ear or belly stretch, reduce the occurrence of cracks and cracks at the end of the roll caliber to about 20% of the conventional level, and roll polishing amount is about 15% of the conventional level. Reduced to
[0012]
【The invention's effect】
According to the present invention, there is an effect that it is possible to significantly reduce the occurrence of cracks and cracks in a roll without causing the ear-stretching and belly-stretching of the vertically striped steel sheet.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a conventional example of a roll for vertically striped steel sheets.
FIG. 3 is a cross-sectional view showing a problem of a conventional roll for vertical stripe steel sheets.
[Explanation of symbols]
1 Caliber roll (roll for vertically striped steel sheet, conventional)
2 Backup roll 3 Flat roll (lower roll)
4 Steel plate (Vertical striped steel plate)
5 Cracks 6 Crack 7 Repeat bending force 8 Convex 9 Concave
10 Main Kariba area
11 Deputy Kariba area
12 Flat area
20 Roll for vertical stripe steel sheet (present invention)

Claims (1)

A roll radius that has a main caliber region in which convex portions with a roll radius r ₀ and concave portions with a roll radius r ₁ (<r ₀ ) are alternately arranged at the center in the roll axis direction and that is continuous with both outer sides of the main caliber region A roll for a vertically striped steel sheet, having a secondary caliber region where r ₂ : 1.00 < r ₀ / r ₂ ≦ 1.02, and further having a flat region having a roll radius r ₀ connected to both outer sides of the secondary caliber region.

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