JP3027503B2 - Rolling method for section steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method for freely forming a plurality of sizes in a shape steel in a rolling step.

[0002]

2. Description of the Related Art Shaped steels currently manufactured have various types, cross-sectional shapes and dimensions, and the number of types and sizes is extremely large. In order to produce these various types and sizes of shaped steel, a large number of rolling rolls are required. Therefore, the number of times of roll change is increased, the loss of required time is increased, and productivity is significantly impaired. In addition, it is necessary to exclusively hold rolls and guides corresponding to the shape of the product, and there is a disadvantage that it is not possible to easily respond to needs such as diversification of product dimensions.

FIG. 6 shows a typical example of a row of conventional H-section steel rolling equipment, in which a breakdown process (BD) 15,
Subsequently, a 4-roll universal rolling mill (R)
U) and an intermediate rolling mill group 16 composed of an edger rolling mill (E), and a finishing universal rolling mill (FU) 17. FIG. 7 shows the relationship between the configuration of the rolling rolls in the universal rolling method, the moving direction of the rolls, and the material to be rolled. In terms of the function of the universal rolling mill, the dimensions are such that the same set of roll pairs can be freely changed. Are only the gap 20 between the upper horizontal roll 18 and the lower horizontal roll 18 'and the gaps 21 and 21' between the left and right vertical rolls 19 and 19 'and the side surfaces of the horizontal rolls 18 and 18'.
Therefore, as shown in FIG. 8, the web thickness and the flange thickness of the H-section steel can be changed in the same roll set, but when the web inner width IW is constant and a product having a different flange thickness Tf is rolled, , Web inner width I
The web outer width OW, which is the sum of W and the right and left flange thicknesses Tf, changes. As a result, in order to manufacture an H-section steel having a constant web outer width and various flange thicknesses, or an H-section steel having a constant flange thickness and a different web outer width, rearrangement for each size is required, thereby increasing productivity. Was extremely low.

[0004] To solve this problem, Japanese Patent Laid-Open Publication No. Sho 59-202 discloses a technique for producing a plurality of shapes of steel without rearrangement.
No. 101, JP-A-61-27900, and JP-A-4-288902. JP-A-59-2021
As shown in FIG. 9, the technology disclosed in Japanese Patent Application Publication No. 01-001 No. 01 is characterized in that two oblique rolls 22 and 23 each contact the inner side of the flange of the material, and the roll axis and the rolling direction θH in a horizontal plane. By pressing down the web adjacent to the flange of the material while maintaining the angle of θV with the horizontal axis in the horizontal plane, the material in the pressed down portion flows in the width direction, and the web is moved in the width direction without generating web waves etc. Is to widen. In FIG. 9, the angle .theta.H that the oblique rolls 22 and 23 make with the rolling direction and the oblique rolls 22 and 22 '.
By adjusting the distance L between and 23, 23 ', it is possible to change the widening amount.

[0005] Fig. 10 shows a rolling mill train for forming a plurality of sizes without changing the H-shaped steel by adopting the above-mentioned technique. The rolling mill row is a universal rolling mill (RU)
A group of intermediate rolling mills consisting of 5 and an edger rolling mill (E) 6;
It comprises a widening rolling mill 7 and a universal rolling mill 8 with variable finishing cylinder width. In the intermediate rolling step, the beam blank supplied from the previous step is shaped to a web thickness and a flange thickness close to the final product, and a fillet is formed near the flange. The horizontal rolls 9, 9 'of the universal rolling mill 5 are provided with calipers for forming meat, and the width of the body corresponds to the minimum inner web width among the product sizes produced by the same roll. The side surface of the horizontal roll is tapered at about 5 °. The edger rolling mill 6 is a two-roll type rolling mill that reduces the flange width. The widening rolling mill 7 can produce products having different web inner widths by changing the width of the oblique rolls 22 and 23.
The variable finishing cylinder width universal rolling mill 8 makes the flange taper provided by the intermediate universal rolling mill a right angle and shapes the root of the flange and the web. The horizontal roll 11 is divided into two in the width direction so that the body width can be changed so that shaping can be performed according to different web inner widths.

[0006] The technique disclosed in Japanese Patent Application Laid-Open No. 61-279001 expands the width by reducing the material (filling) applied to the vicinity of the flange of the web in a universal rolling mill in which the vertical roll is opened. Kaihei 4-288902
In the technique disclosed in Japanese Patent Laid-Open Publication No. H10-207, the width is increased by rolling down a material (filling) applied near the flange of the web with a universal rolling mill. In both technologies, the rolling is carried out by a universal rolling mill arranged in place of the oblique rolls 22 and 23 in FIG. 10, but the width that can be widened is smaller than that in JP-A-59-202101, The size range that can be divided is narrow. However, even in this method, there is a limit on the product size that can be manufactured without recombination.

[0007]

Problems to be Solved by the Invention
The reason why the size of a product that can be separately manufactured without any change in the technology disclosed in Japanese Patent Application Publication No. 01-001 is limited will be described below. That is, in the above technique, it is necessary to form a fillet in the vicinity of the flange of the material web in accordance with the widening amount. If the amount of meat is insufficient compared to the amount of widening, the web may be constricted or the flange may be curved. Therefore, the horizontal rolls of the universal rolling mills of the intermediate rolling mill group have the largest width (the maximum inner web width of the size that can be separately manufactured by the same roll) among the sizes to be manufactured without rearrangement.
A caliber is provided to form the required meat (minimum web width).

In the intermediate rolling step, the rolling is performed in the same pass schedule even if the inner width of the web of the product is different, in order to roll the thickness of the web and the flange to the product thickness.
Therefore, the material shape after the intermediate rolling is the same irrespective of the inner width of the web of the product, and the meat required for the maximum widening by the oblique roll is formed near the flange of the web. As a result, in the case of manufacturing a product having an intermediate width in the web, the oblique roll mill rolls down the meat which is larger than the widening amount. Further, for the size having the minimum web inner width, since the width is not widened by the oblique rolls, it is necessary to eliminate the applied meat by the universal rolling mill in the finish rolling step. In the oblique rolling mill, the product shape will not be extremely deteriorated even if a large amount of meat is reduced compared to the widening amount, but if the amount of meat to be erased by the finishing universal rolling mill is excessive, the web Excessive metal flow to the center in the width direction causes buckling of the web.

In order to widen the size of the same roll, it is necessary to increase the amount of widening by the oblique rolls. The amount needs to be increased. Although there is some difference depending on the size, the amount of meat (thickening area) equal to or greater than the width of the web x the thickness of the web is required. However, in the prior art, since the material shape after the intermediate rolling step in the case of separately forming with the same roll is constant as described above, for the size having the smallest web inner width, the amount of meat to be erased by the finishing universal rolling mill as described above Becomes excessive, causing web buckling,
Significantly deteriorates product shape. For example, an H-section steel having a nominal dimension (web outer width × flange width × web thickness / flange thickness, the same applies hereinafter) of 700 × 200 × 9/22 was examined by a finishing universal rolling mill.
In the case of 0 mm ^2, the erasing could be performed without any problem. However, in the case of 400 mm ² , the buckling occurred in the web, and the erasing was not possible. At this size, a 300 mm ² fill corresponds to a 30 mm widening. That is, for the size of this example, the outer width of the web that can be formed by the same roll is limited to 700 mm to 730 mm. As described above, in the finishing universal rolling mill, there is a limit on the fillable area that can be eliminated without deteriorating the shape, and thus the amount of widening is limited.

[0010] The elimination of the meat by the finishing universal rolling mill every time each pass of the universal rolling mill for forming the meat in the intermediate rolling step is performed can increase the erasable meat amount. . However, as shown in FIG. 5, when the meat is removed by the finish rolling mill, the amount of reduction becomes larger near the flange of the web, so that the abrasion loss of this portion increases. Can not be done. Therefore, it is impossible to eliminate the meat in each pass by the universal rolling mill in the finish rolling process.

[0011] The present invention solves the above-mentioned problems, and in a rolling method in which a plurality of sizes of section steels are separately formed by the same roll by widening the web with a widening rolling mill, the web is widened to a size which is not widened. It is an object of the present invention to provide a method for producing a wide range of shapes of steel without rearrangement by providing a method for rolling down a flange and a web without forming meat.

[0012]

The gist of the present invention is to provide an intermediate universal rolling mill and an edger rolling mill provided with horizontal rolls provided with calipers for forming a meat blank by shaping the beam blank formed in the preceding step. Rolling of the formed intermediate rolling mill group, the widening rolling mill, and the horizontal roll, which are rolled by a finishing universal rolling mill with variable barrel width, and the widening rolling mill adjusts the widening amount to produce differently shaped steel sections In the method, when manufacturing a size without widening, the intermediate universal rolling mill, reverse rolling by a finishing universal rolling mill is performed, the vicinity of the flange of the web is reduced by the finishing universal rolling mill, and the center of the web is reduced by the intermediate universal rolling mill. Rolling only the part.

[0013]

Hereinafter, the present invention will be described in detail. FIG. 3 shows the shape of the material before and after being reduced by a universal rolling mill provided with a horizontal roll provided with a caliber for forming meat. Although the central portion of the web is reduced by the reduction, the vicinity of the flange of the web is not reduced because the caliber is applied to the roll, and this portion remains meat. Also,
The reason why the finishing universal rolling mill cannot erase the meat in each pass, as described above, is that the amount of wear differs because the amount of reduction in the width direction is not uniform. Therefore, in the case of performing uniform reduction in the width direction as shown in FIG. 4, a finishing universal rolling mill can be used for each pass.

From the above facts, the inventors first reduce the thickness of the web near the flange with a finishing universal rolling mill, and then perform rolling of an intermediate universal rolling mill.
It has been found that the thickness of the web and the flange can be reduced without forming a fillet without making the amount of reduction in the finishing universal rolling mill uneven in the width direction.

FIG. 10 shows a path flow in the case of performing rolling mill rows and widening which are the premise of the present invention. The rolling mill row is a universal rolling mill (RU) 5 and an edger rolling mill (E) 6
, A wide rolling mill 7, and a variable finishing cylinder width universal rolling mill. In the group of intermediate rolling mills,
The beam blank formed in the previous process is reduced to a web thickness and a flange thickness close to the final product, and a fillet is formed near the flange. A horizontal caliber 9 and 9 'of the universal rolling mill 5 is passed through a caliber for forming meat, and the width of the body corresponds to the minimum inner web width among the sizes of products manufactured by the same roll. The side surface of the horizontal roll is tapered at about 5 °. The edger rolling mill 6 is a two-roll type rolling mill that reduces the flange width. The widening rolling mill 7 can produce products having different web inner widths by changing the width of the oblique rolls 22 and 23. The variable finishing cylinder width universal rolling mill 8 makes the flange taper provided by the intermediate universal rolling mill a right angle, and also forms the root of the flange and the web. The horizontal roll 11 is divided into two parts in the width direction so that the forming can be performed according to the inner widths of the different webs, so that the body width can be changed. FIG. 10 shows the widening rolling mill 7.
Although an example in which an oblique roll rolling mill is used has been described, the same applies to a case in which another widening rolling mill is used.

The present invention is applied to a size having a minimum inner web width. FIG. 2 shows a path flow at that time, and FIG. 1 shows a material shape for each pass. First, the intermediate universal rolling mill 5 is opened, and the beam blank 1 formed in the previous process is opened.
Is rolled down only by the flange and the vicinity of the flange of the web by the universal rolling mill 8 to produce the material 2 having a thick central portion of the web. Subsequently, the intermediate universal rolling mill 5
, Only the flange and the center of the web are reduced to produce a material 4 with a flat web. Since the reverse rolling is performed, the reduction of the intermediate universal rolling mill 5 is continuous, so that the process of flattening the central portion of the web may be performed in two passes. Similarly, only the flange and the vicinity of the flange of the web are reduced by the finishing universal rolling mill 8 to produce a thick material only at the central portion of the web.
By reducing the flange and the central part of the web only, and repeating the flattening of the web, the amount of reduction in the width direction in the finish rolling mill is not made uneven, without forming the meat, The web can be reduced to the thickness of the product.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The product used in the present invention has a flange width of 200 m.
m, a web thickness of 9 mm, and a flange thickness of 16 mm, the web outer width was separately formed from 700 mm to 750 mm. The size of the beam blank at the start of intermediate rolling is 768
× 200 × 27/50. The width of the horizontal roll of the intermediate universal rolling mill is the minimum web width 70
The width was 668 mm corresponding to the inner web width of 0 mm. The horizontal roll of the intermediate universal rolling mill was provided with a caliber for forming 500 mm ² , which is a required thickness for widening 50 mm for a web thickness of 16 mm. A two-roll type edger rolling mill was arranged on the rear surface of the intermediate universal rolling mill.

The product having an outer web width of 750 mm was rolled in the same manner as in the prior art according to the schedule shown in Table 1 to form meat. Thereafter, the width of the web was increased to 50 mm by an oblique roll mill to make the outer width of the web 750 mm, and the product was shaped by a finishing universal mill to obtain a product having an outer width of 750 mm.

[0019]

[Table 1]

The product having an outer web width of 700 mm was rolled according to the pass schedule shown in Table 2. That is,
In the first and second passes, the flange and the vicinity of the flange of the web were reduced by a finishing universal rolling mill to increase the thickness of the central portion of the web. In the third and fourth passes, an intermediate universal rolling mill was used to reduce only the flange and the center of the web. Similarly, after a material having a small thickness near the flange of the web is produced by the finishing universal rolling mill, the intermediate universal rolling mill is repeatedly pressed down only at the central portion of the web, and is then reduced to the product web thickness and the flange thickness. After that, the product having an outer web width of 700 mm was obtained by performing shaping with a finish rolling mill without performing widening using an oblique roll.

[0021]

[Table 2]

[0022]

According to the present invention, in a rolling method in which webs are widened by a widening rolling mill to form a plurality of sizes of shaped steel on the same roll, a thickened meat is formed in a size that is not widened. Since it is possible to reduce the flange and the web without the need, it is possible to manufacture a wide range of shapes of steel without rearrangement.

[Brief description of the drawings]

FIG. 1 is a diagram showing a material shape for each pass according to the present invention.

FIG. 2 is a diagram showing a path flow of the present invention.

FIG. 3 is a view showing a material shape before and after being reduced by a universal rolling mill having a horizontal roll provided with a caliber for forming meat.

FIG. 4 is a diagram showing a relationship between a roll and a material when a web is pressed down on a flat material by a finishing universal rolling mill.

FIG. 5 is a view showing a relationship between a horizontal roll and a material in a case where meat is erased by a finishing universal rolling mill.

FIG. 6 is a diagram showing a typical example of a conventional section rolling mill train.

FIG. 7 is a diagram illustrating functions of a universal rolling mill based on a positional relationship between a rolling roll and an H-section steel.

FIG. 8 is a diagram showing an example of a product shape produced by a universal rolling mill.

FIGS. 9A and 9B are explanatory diagrams of a technique for separating the inner width of the web by oblique rolls.

FIG. 10 is a diagram showing a conventional rolling mill row and a pass flow for forming shaped steels of a plurality of sizes using a widening rolling mill.

[Explanation of symbols]

Reference Signs List 1 Beam blank on entry side of intermediate rolling mill group 2, 2 ', 2 "Finished universal rolling mill Rolled down material near the flange of web 3 Material rolled down a part of center of web 4 Rolled down web center 5 A universal rolling machine with a horizontal roll provided with a caliber for forming meat 6 An edger rolling mill 7 A widening rolling mill 8 A horizontal rolling roll width variable universal rolling mill 9, 9 'An intermediate universal with a caliber Horizontal rolls of rolling mill 10, 10 'Vertical rolls of intermediate universal rolling mill 11, 11' Variable horizontal width rolls of finishing universal rolling mill 12, 12 'Vertical rolls of finishing universal rolling mill 13 Material shape before meat formation 14 Material shape after meat formation 15 Breakdown rolling mill 16 Intermediate rolling mill group 17 Finishing rolling mill 18,1 8 'Horizontal roll of universal rolling mill 19, 19' Vertical roll of universal rolling mill 20 Gap between upper and lower horizontal rolls 21, 21 'Gap between horizontal roll side and vertical roll 22 Oblique roll 23 Oblique roll 24 Before widening Material 25 Material after widening

Claims (1)

(57) [Claims] 1. The beam blank formed in the preceding step is
An intermediate rolling mill group consisting of an intermediate universal rolling mill and an edger rolling mill equipped with horizontal rolls provided with calipers for forming meat, widening rolling mills, finishing universal rolling mills in which the width of the horizontal roll body is variable Rolling, in the method of rolling shaped steel to adjust the amount of widening with a widening rolling mill to produce shaped steel of different sizes, when manufacturing a size without widening, reverse by an intermediate universal rolling mill, finishing universal rolling mill A section steel rolling method in which rolling is performed, and near a web flange is reduced in a finishing universal rolling mill, and only a central portion of the web is rolled in an intermediate universal rolling mill.