JP2626330B2 - Edger rolling mill for H-section steel rolling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edger rolling mill used for hot rolling of an H-section steel, and more particularly to an H-section steel intermediate rolling step comprising a universal rolling mill and an edger rolling mill. The present invention relates to an edger rolling mill effective for reducing the center deviation of the web.

[0002]

2. Description of the Related Art In general, hot rolling of a section steel represented by an H section steel is performed, for example, as shown in FIG. 5 (a), using a breakdown rolling mill 10, a rough universal rolling mill 11, an edger rolling mill.
12 and finishing universal rolling mill 13 in combination. That is, slabs, rectangular billets, H
After roughly forming a rolling material such as a billet for section steel into a predetermined shape by a breakdown rolling machine 10 to obtain a rough shaped material, rolling in an intermediate stage of multiple passes by a rough universal rolling mill 11 and an edger rolling machine 12 is performed. Thereafter, the finished H-shaped steel is obtained by rolling in one pass in the finishing universal rolling mill 13.

FIG. 6A shows the rolling process at this time. In the figure, in a rough universal rolling mill (UR) 11, a web 2 of a rough material 1 is rolled by a horizontal roll 20, and flanges 1a, 1b are tapered and supported by a vertical roll 21.
Next, the edger roll 22 of the edger rolling mill (E) 12
As a result, the upper and lower ends of the flanges 1a and 1b are pressed down. This rolling process may be repeated two or more times. Then, in the finishing universal rolling mill (UF) 13, the flanges 1a and 1b are raised by the cooperation of the horizontal roll 23 and the vertical roll 24, and the H-section steel 3 is finished.

As a method for producing a highly efficient H-section steel, as disclosed in Japanese Patent Publication No. 50-21984,
An edger rolling mill is placed at the center of the base coarse universal rolling mill, and is positioned close to each other so as to enable simultaneous biting.
There is a method in which the base rolling mills are arranged in a skewer shape, the rolled material after breakdown rolling is subjected to reversible multiple-pass rolling in the above-mentioned rolling mill group, and sent to the finishing universal rolling mill group to produce a product.

[0005] Fig. 5 (b) shows the layout of each rolling mill in this case, and Fig. 6 (b) shows the rolling process of the rolling mill at that time.
The rough material 1 roughly formed by the breakdown rolling mill 10 is the first material.
Coarse universal rolling mill (UR1) 11, edger rolling mill (E) 1
2 and reversible rolling between the second coarse universal rolling mill (UR2) 14 and finally the universal finishing mill (UF) 13
As a result, the final shape of the H-section steel 3 is obtained. The rolling process is basically the same as that of FIG. 6A, and the same members in FIG. 6B are denoted by the same reference numerals.

As described above, in the conventional edger rolling mill 12 shown in FIGS. 6 (a) and 6 (b), only the ends of the flanges 1a and 1b are rolled to restrict the expansion of the flange width and the shaping and forging effect of the flange end. The purpose is to issue. Therefore, it is general that the large-diameter portion at the center of the edger roll 22 is not brought into contact with the coarse material (rolled material).

However, in such a rolling process of the H-section steel, the rough sectional slab has irregularities in the flange cross-sectional area at the four locations of upper, lower, left and right, or poor relative positional relationship between the horizontal roll and the vertical roll. As a result, a web center deviation occurs. This web center deviation is defined by (a−b) / 2 as shown in FIG. Here, a and b are distances from both ends of the upper and lower flanges to the upper and lower surfaces of the web, respectively. FIG. 7 also shows the names of each part of the H-section steel for reference.

Conventionally, in order to prevent such a web center deviation, a horizontal roll pair of a rough universal rolling mill is relatively moved to an entrance side or an exit side as disclosed in Japanese Patent Publication No. 59-13921. And a method in which first and second coarse universal rolling mills are provided as proposed in JP-A-62-263801, and a flange and a web are simultaneously reduced in a second universal rolling mill. Proposed.

According to the latter method, FIG. 5 (c) and FIG.
As shown in the rolling process, the vertical rolling of the second coarse universal rolling mill 14 is performed in a rolling mill row in which an intermediate rolling mill group includes first and second coarse universal rolling mills 11 and 14.
The horizontal rolls 31, 31 'of the rough universal rolling mill 14 simultaneously lower the entire surface of the web 2 of the crude material 1 and the flange end while lowering a part of the flange surface by 32, 32'. That is, at the time of rolling in the second coarse universal rolling mill 14, the web and the flange end face are rolled by the horizontal rolls 31, 31 'and the vertical rolls 32, 32', and the flange outer face is rolled by the vertical roll pair 32, 32 '. Is performed.

Further, as described above, the conventional edging mill shown in FIG. 6 is based on the basic edging rolling condition that the same edging roll is used for rolling different web thicknesses within the same name series. The fact is that the width of the flange piece of the H-section steel of the product must be constant within each designation series. In fact, even in the JIS standard, a part of it is shown in Table 1, but the width of the flange piece is fixedly defined in each designation series. However, this is inconsistent with the fact that it is advantageous from the viewpoint of utilization technology of the H-section steel that it is more convenient for the entire flange width to be constant within each of the designation series, and this has been a problem.

In the prior art as well, the problem that the flange piece width is constant and the overall flange width fluctuates as described above is solved, and the flange one-width adjustment is performed so that the overall flange width is constant within each of the designation series. Edger rolling mills that can be performed online in a stepless manner have already been proposed. For example, in an edger rolling mill disclosed in Japanese Patent Application Laid-Open No. 62-77107, as shown in FIG. 9, an eccentric ring 42 is fitted on each edging roll 40, and a web restraining ring 44 is provided thereon. . At this time, since the position of the edging roll 40 that performs the flange end face reduction does not change,
According to such a configuration, the eccentric ring 42 is fixed at an appropriate rotation position, and the distance between the upper and lower web restraining ring pairs, that is, the flange piece width can be changed online.

Further, as shown in FIGS. 10 (a) and 10 (b), an edger rolling mill disclosed in Japanese Patent Application Laid-Open No. Sho 62-77101 has a back-up roll supported on a shaft 46 of a split horizontal roll 45. A roll 47 and an operating roll 48 for lowering the flange are provided,
By changing the position of the backup roll 47, the distance between the pair of working rolls is changed, and the amount of reduction in the flange end face, that is, the entire width of the flange can be adjusted.

[0013]

By the way, the recent use technology of H-section steel is not used for machines and structures as in the past, but is widely used in the field of construction. It has been required that the web be attached to the center of the flange, that the entire width of the flange be constant, and that the dimensional accuracy be high. However,
The conventional H-shaped steel could not satisfy such requirements.

For example, first, in the method of manufacturing an H-beam as shown in FIG. 5 (a) or (b), FIG. 6 (a) or (b)
As shown in the rolling process, only the end faces of the flange are rolled by the edger rolling mill 12, and the large diameter portion at the center of the edger roll is generally made to have a gap of about 1 to 3 mm without contacting the rolled material. there were. Therefore, the upper and lower end faces of the flange portion of the H-section steel being rolled by the edger rolling mill are restrained by the edger rolls, and the flange end face is positioned almost vertically symmetrically with respect to the pass center of the rolling mill. However, since the web portion is not restrained by the edger roll, there is a possibility that the web portion can freely move up and down.

[0015] Therefore, in the case of forming into a rough shaped steel slab (beam blank) having irregularities in the flange cross-sections at four locations in the upper, lower, left and right directions in the upstream breakdown rolling, a plurality of passes are required in the intermediate rolling mill group including the edger rolling mill. In the process of repeating the rolling, the web surface is easily replaced vertically asymmetrically with respect to the pass center of the rolling mill, and the web center is biased as shown in FIG. According to the method disclosed in Japanese Patent Application Laid-Open No. Sho 62-263801, the center deviation of the web is somewhat improved, but it is still not sufficient, and it is not a practical means because of the following problems. .

That is, FIGS. 11 (a) and 11 (b) show the sectional shape and the position of the roll of the rough material 1 shown in FIG.
In particular, the gap between the horizontal roll 31 and the vertical roll 32 is emphasized. Therefore, when the rough material 1 as a rolling material rolled by the breakdown rolling machine is rolled by a universal rolling mill having a structure as shown in FIG. 8, it is clear from FIGS. 11 (a) and 11 (b). So that the width of vertical rolls 32 and 32 'is
Upper and lower horizontal rolls 31, 31 'with the minimum gap between 1, 31'
The vertical rolls 32, 3 are always smaller than the distance between them.
The rolling down of the flange by 2 'is limited to the area where the rolls are in contact. Therefore, there is always a portion of the vertical rolls 32, 32 'which is not subjected to the reduction of the rolls from the start to the end of rolling, with a certain degree of difference from the start to the end of rolling, and this portion does not have a predetermined flange thickness as an unrolled portion. In addition, the boundary between the unrolled portion 33 'and the rolled portion 33 remains as a linear flaw in the rolling direction.

Further, when the universal rolling mill having the structure shown in FIG. 8 is realized, each time the product flange width is changed, in addition to the horizontal roll pair, the horizontal roll shape and dimensions (minimum gap between the upper and lower horizontal rolls) are determined. It will be necessary to replace with a vertical roll pair. For this reason, there is a new problem that the number of rolls is increased and the time required for the roll change is increased. Further, when the edger rolling mill disclosed in Japanese Patent Application Laid-Open No. Sho 62-77107, which adjusts the width of the flange piece, as shown in FIG. 9, the following problem is observed, which is not practical. .

Since the eccentric mechanism is provided, the entire apparatus becomes extremely complicated. Because bearings (not shown) are provided between the horizontal roll 40 and the eccentric ring 42 and between the eccentric ring 42 and the web restraining ring 44, there are difficulties in lubricating the bearing and sealing it from surrounding water and scale. And the durability may be extremely deteriorated. On the other hand, when the edger rolling mill disclosed in Japanese Patent Application Laid-Open No. 62-77101 that freely adjusts the width of the flange piece of the product, the following problems are seen as can be seen from the description of FIG. , Not practical.

The working roll for rolling down the flange must be smaller in diameter than the edger roll of the current edger rolling mill, and the bite of the rolled material deteriorates, so the amount of reduction of the flange width is restricted. Since the split type horizontal roll and the working roll for lowering the flange have completely different rotational motions, the two rolls cannot be brought into contact with each other. Therefore, it is necessary to keep the side gap between the two rolls at an appropriate level. For this reason, there is a possibility that the rolled material may be caught in the gap when the front end portion of the flange is lowered, causing trouble. Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to eliminate the center deviation of the web, to freely adjust the width of the flange piece, and to make the entire width of the flange constant for rolling an H-beam. An edger rolling mill is provided.

[0020]

The present invention has been made as a result of various studies in order to achieve the above object, and the gist of the present invention is to provide a set of a pair of rolls constituting an edger rolling mill main body. And a pair of horizontal rollers for restraining the upper and lower surfaces of the web disposed on the line between the axes of the roll pairs, and a reaction force applied to the pair of horizontal rollers between the roll pair and the pair of horizontal rollers during rolling. above as supported by the roll pair
An edger rolling machine for rolling an H-section steel , comprising: at least one intermediate roller disposed at each lower part . According to a preferred aspect of the present invention, by changing the distance between the intermediate roller and the center line of the roll pair, the horizontal roller according to the web thickness of the rolled material in each pass of rolling or a plurality of passes. You may comprise so that the space | interval of a pair may be adjusted.

[0021]

Next, the structure and operation of the present invention will be described more specifically with reference to the accompanying drawings. That is, FIGS. 1 (a) and (b)
As shown in, the edger rolling mill 50 according to the present invention,
One set of roll pairs 52, 52 constituting the body of the edger rolling mill
And a pair of horizontal rollers 54, 54 for restraining the upper and lower surfaces of the web disposed on the line between the axes of the roll pairs, and a roll roller between the roll pair and the horizontal roller pair, which is applied to the horizontal roller pair during rolling. At least one so that the force is supported by the roll pair
And two intermediate rollers 56, 56 in the illustrated example. These horizontal roller pairs 54, 54 and intermediate rollers 56, 56 are supported by web guides 60 provided before and after the pair of rollers constituting the edger roll.

The intermediate roller 56 and the roll pair 5
2, further comprising a mechanism for adjusting the distance between the horizontal roller pair 54, 54 in accordance with the web thickness of the rolled material in each pass of rolling or a plurality of passes by changing the distance between the axes of the 52, 52 You may. Figures 2 (a) and (b) show the web guide
FIG. 1B is a schematic explanatory view of a mode of attaching the web-constrained horizontal roller 54 and the intermediate roller 56 to 60. In the figure, a web guide 60 whose shape is not particularly limited is, as is clear from FIG. Each roller is supported from the inside, and the web guide 60 itself is appropriately supported from the outside.

In FIG. 2, the edger roll (body) 52
As a mechanism for adjusting the distance between the horizontal roller pair 54 and the horizontal roller pair 54, a hydraulic cylinder 62 having one end attached to the web guide 60 and supporting the intermediate roller 56 at the other end is exemplified.

The distance between the body of the edger roll 52 and the web surface of the rolled material can be changed according to the desired flange width and the amount of reduction of the flange end face.
(A) As shown in (b), depending on the diameter of the web restraining horizontal roller 54 and the intermediate roller 56 provided therebetween.
Determined edger roll 52 and web restrained horizontal row
The distance (L) between the centers of the shafts 54 is set to the upper limit (Lmax),
By adjusting appropriately within the limit (Lmin).
It is possible to change it. Therefore, according to the present invention, the gap between the roller pairs is adjusted according to the web thickness for each rolling pass by the horizontal roller pairs 54, 54 arranged on the axis between the upper and lower edger rolls 52, 52. The upper and lower edges of the flange are rolled down by the upper and lower edger rolls 51, 51 while holding the upper and lower surfaces of the web symmetrically with respect to the center of the rolling mill so that the flange width is equal to the upper and lower edges of the web center. In other words, it is possible to manufacture an H-section steel having extremely small web center deviation.

Further, according to the present invention, as shown in FIGS. 1 (a) and 1 (b), the intermediate between the pair of edger rolls (body portion) 52, 52 and the pair of horizontal rollers 54, 54 for restraining the web. By arranging two rollers 56 each at the top and bottom, the rolls and the rollers are always in contact with each other, so that when the web surface is constrained by the horizontal rollers, a load is applied to the horizontal rollers 54, 54 from the rolled material. The rolling reaction force can be shared by the edger roll (body portion) 52 having high rigidity via the intermediate roller 56, and the web restraining effect by the pair of horizontal rollers (54, 54) can be significantly enhanced. Things.

Incidentally, the intermediate roller 56 is provided as shown in FIG.
In addition to the arrangement of two upper and lower rollers between the pair of edger rolls and the pair of horizontal rollers as shown in (b), a method of arranging one roller as shown in FIG. Further, as illustrated in FIG. 4, a method of connecting the intermediate roller 56 and the horizontal roller 54 by using a connection fitting 64 may be used. In this case, the intermediate roller 56
Is not in direct contact with the horizontal roller 54, so that the horizontal roller 54 is not driven. In such a configuration, a mechanism for adjusting the distance between the edger roll (body portion) 52 and the horizontal roller 54 is an angle adjusting mechanism for the two connection fittings 64.

The basic configuration of the H-section steel rolling line to which the edger rolling mill according to the present invention is applied is as shown in FIG. 5 (a) in the example of the UR-E arrangement. FIG. 6 (a) shows the state of the processing of the section steel by the change in the cross-sectional shape of the crude material. Further, in the example of the UR-E-UR arrangement, the rolling line when the present invention is applied is as shown in FIG. 5 (b), and the change in the cross-sectional shape of the rolling material at that time is shown in FIG. 6 (b). It is as follows. In these respects, the case of the present invention is not substantially different from the case of the prior art.

Here, a method of rolling an H-section steel using the edger rolling mill according to the present invention will be described. First,
Breakdown rolling may be performed in the same manner as in the conventional method, and the rolled material is rolled into a beam blank (coarse billet). Next, the intermediate material is subjected to intermediate rolling using a rough universal rolling mill and an edger rolling mill in a UR-E configuration or a UR-E-UR configuration to finish the rolled material to the final dimensions of the flange width, flange thickness, and web thickness.

Therefore, the web thickness and the flange thickness are reduced by the universal rolling mill by introducing the edger rolling mill according to the present invention into the intermediate rolling mill group, and the flange width is reduced to a predetermined value by the edger rolling mill. In each of the repetitive passes, the vertical movement of the web surface in the edger rolling mill is restricted, so that the occurrence of the center deviation of the web can be significantly suppressed. UR-E placement and
When performing multi-pass reversible continuous rolling of H-section steel in a rolling mill group in the UR-E-UR arrangement, while constraining the web surface of the crude material with a pair of horizontal rollers as described above, a predetermined flange width is used in an edger rolling mill. In order to perform the edging up to the above, it is necessary to change the distance between the axis of the horizontal roller and the edger roll at every rolling pass or every several rolling passes.

However, when the edger rolling mill according to the present invention is used, for example, as shown in FIG.
Intermediate roller 56 from the center line between the pair of horizontal rollers 54, 54 and the pair of edger rolls 52, 52 for restraining the web.
By changing the distance (S) , the distance (L) between the horizontal roller and the edger roll axis can be changed within a certain range. For example, FIG. 2A shows a state where the distance between the axes is maximum (= Lmax , where S is a minimum value Smin ), and FIG. 2B shows a state where the distance between the coaxial centers is minimum (= Lmi).
n , at this time, S indicates a state where the maximum value is reached (Smax ).

As a specific example, in FIG. 2, the diameter of the edger roll body (= d1) is 900 mm, and the diameter of the intermediate roller (= d2)
Is 30 mm and the diameter of the web-constrained horizontal roller (= d3) is 50 mm, Lmax = 501.9 mm and Lmin = 475 mm. Therefore, it is possible to adjust 26.9 mm with the flange piece width of Lmax-Lmin = 501.9-475 = 26.9 mm. In order to move the intermediate roller 56, a method using a hydraulic cylinder or an electric motor (not shown) as shown is practical. Next, finish universal rolling is performed, which may be performed in the same manner as in the conventional method, and there is no particular limitation in the case where the edger rolling mill according to the present invention is used. Thus, according to the present invention, an H-section steel can be efficiently produced without any deviation in the center of the web and with a constant overall flange width.

[0032]

EXAMPLES The present invention will be described in detail with reference to examples. (Example 1) In the rolling line shown in FIG.
By introducing the edger rolling mill according to the present invention shown in (a) and (b), a JIS size H-section steel H800 × 300 series was manufactured. First, after the continuous cast slab was heated, reversible rolling was performed by a breakdown rolling machine having a roll die to form a beam blank. Furthermore, the coarse universal rolling mill (U
R) and reversible rolling were performed by an edger rolling mill (E), and the product was rolled to a shape and dimensions close to the flange thickness, web thickness, and flange width.

The specifications of the edger rolling mill of the present invention are as follows: the diameter of the edger roll (body portion) is 900 mm, the diameter of the intermediate roller is 30 mm, the diameter of the web-constrained horizontal roller is 50 mm, and the intermediate roller is moved horizontally by an electric motor. The distance between the axes of the edger roll and the horizontal roller with a flange piece width of 25 mm was adjusted by shifting with a mechanism using. Thus, the position of the intermediate roller was adjusted for each rolling pass so that the gap between the large diameter portion at the center of the edger roll and the web surface of the rolled material was ± 1 mm. Next, the rolled material after the intermediate rolling is slightly reduced in thickness of the web and flange by one-pass rolling in a finishing universal rolling mill (UF),
The product was finished by flattening the outer surface of the flange and further making the opening of the flange and the web at a right angle.

Table 2 shows the measurement results of the center deviation of the web of the product when the edger rolling mill according to the present invention is used for three sizes of the H800 × 300 series. In the same table, the results of measuring the center deviation of the web center of a product when a conventional edger rolling mill without the horizontal roller pair shown in FIG. 1 is applied to the same rolling line as a comparative example (referred to as UR-E method) are shown. Is also indicated. From the results in Table 2, it can be seen that the use of the edger rolling mill according to the present invention significantly reduces the web center deviation of the product regardless of the size of the H-section steel, and provides a product with excellent dimensional accuracy.

(Example 2) In the rolling line shown in FIG. 5 (b), the edger rolling mill according to the present invention shown in FIG.
Production of three sizes of H-section steel of the 200 series was performed.
Also in the case of this embodiment, after heating the continuous casting bloom, reversal rolling was performed by a breakdown rolling mill, and rolling was performed through the same process as in the first embodiment until a beam blank was formed.

Next, two coarse universal rolling mills (UR1,
UR2) and an edger rolling mill (E) located in the middle of the reversal mill, and rolled to a shape and dimensions close to the product flange thickness, web thickness, and flange width. The specifications of the edger rolling mill of the present invention include an edger roll (body) diameter of 900 mm, an intermediate roller diameter of 20 mm, a web-constrained horizontal roller diameter of 30 mm, and a motor provided in the horizontal direction for the intermediate roller. By shifting with a mechanism, the distance between the center axes of the edger roll and the horizontal roller with a flange piece width of 15 mm can be adjusted. As a result, the gap between the large diameter portion at the center of the edger roll and the web surface of the rolled material is ± 1 mm.
The position of the intermediate roller was adjusted for each rolling pass so that

Next, the rolled material after the above-mentioned intermediate rolling is slightly reduced in thickness of the web and the flange by one-pass rolling in a finishing universal rolling mill (UF), and the outer surfaces of the flange are flattened. The product was finished to have a right angle opening. Table 3 shows the measurement results of the center deviation of the web of the product when the edger mill according to the present invention is used for three sizes of the H500 × 200 series. The table also shows the results of measuring the center deviation of the web center of a product when a conventional edger mill without the horizontal roller pair shown in FIG. 1 was applied to the same rolling line as a comparative example (referred to as the UR1-E-UR2 method). Is also indicated.

In the rolling by the conventional method, when the entire width of the flange of the product is constant, the width of the flange piece becomes larger as the web thickness (tw) of the product becomes smaller. ) And the web surface of the rolled material must be increased. For this reason, the possibility that the center of the web is replaced up and down increases, and the center deviation of the web of the product becomes worse. On the other hand, by introducing the edger rolling mill of the present invention, by operating the position of the intermediate roller pair online in response to the change in the product flange piece width, the horizontal roller pair is constantly rolled during edging rolling. Since the web of material can be restrained from above and below, it is unlikely that the center of the web will be replaced up and down, and it can be seen that the web center deviation of the product is significantly improved as compared with the conventional method.

[0039]

[Table 1]

[0040]

[Table 2]

[0041]

[Table 3]

[0042]

According to the present invention, as described above, the present invention can significantly reduce the center deviation of the web during universal rolling of H-section steel, and can be applied to the production of H-section steels of various sizes. It is extremely useful in industry.

[Brief description of the drawings]

FIG. 1 shows a rolling process of an edger rolling mill according to the present invention, wherein FIG. 1 (a) is a side view and FIG. 1 (b) is a front view.

FIG. 2 is an explanatory view of a center distance between an edger roll and a horizontal roller in the edger rolling mill of the present invention shown in FIG. 1; FIG. 2 (a) is a view for explaining a maximum center distance;
(b) is a diagram for explaining the minimum center-to-center distance.

FIG. 3 is a side view showing another embodiment of the edger rolling mill according to the present invention.

FIG. 4 is a side view showing still another embodiment of the edger rolling mill according to the present invention.

FIG. 5 is a configuration diagram of an H-section steel rolling line.

FIG. 6 is a cross-sectional view illustrating a process of hot rolling a conventional H-section steel.

FIG. 7 is an explanatory diagram of a web center deviation.

FIG. 8 is a front view of a universal rolling mill according to a conventional center deviation preventing method.

FIG. 9 is a front view showing a universal rolling process in an initial pass and a final pass in a conventional web center deviation preventing method.

FIG. 10 is an explanatory view showing a structure of an edger rolling mill in a conventional center deviation preventing method.

FIG. 11 is an explanatory view showing another structure of the edger rolling mill in the conventional center deviation preventing method.

[Explanation of symbols]

 50: Edger rolling mill 60: Web guide 52: Edger roll 62: Hydraulic cylinder 54: Horizontal roller 64: Connecting bracket 56: Intermediate roller

Claims (2)

(57) [Claims] 1. A pair of rolls constituting a main body of an edger rolling mill, a pair of horizontal rollers for restraining upper and lower surfaces of a web disposed on a line between the axes of the pair of rolls, a pair of the rolls and the pair of horizontal rollers And at least one intermediate roller disposed on each of the upper and lower sides such that the reaction force during rolling applied to the horizontal roller pair is supported by the roll pair. Edger rolling machine for steel rolling. 2. The distance between the horizontal roller pair according to the web thickness of the rolled material in each pass or a plurality of passes by changing the distance between the intermediate roller and the center line of the roll pair. 2. The H-shape steel rolling edger rolling machine according to claim 1, further comprising a mechanism for adjusting.