JPH10235415A - Stepped edger roll and method for rolling wide-flange shape steel using same edger roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent the generation of the deviation of the web center by forming a recessed linear groove in which the flange part of a wide- flange shape steel fits into the flange rolling part of edger rolls which are vertically opposed. SOLUTION: The recessed linear groove is formed at the end parts of the web rolling pats of the flange rolling parts 8 on the edger rolls 4, 4'. Rolling is executed by always bringing the edger rolls 4, 4' into contact with or approaching the web 7 of a material to be rolled. Between the tips of the flanges 6 of the material to be rolled and the recessed linear groove 10 of the flange rolling part 8, there is a clearance in a state of the initial pass, but the both are in contact in the state of the final pass. In the abovementioned manner, in the wide-flange shape steel in the state of the final pass, the center position of web thickness is made to completely coincide with the center position of flange width. Consequently, the deviation of the web center is prevented or remarkably reduced and also the range of the dimension F of a material on the inlet of a Ru is extended, so the number of passes with the BD mill in reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepped edge roll for rolling into an H-section steel and a method for rolling an H-section steel using the edge roll.

[0002]

2. Description of the Related Art When an H-section steel is manufactured by rolling, rolling is performed so that the center position of the web thickness coincides with the center position of the flange width as much as possible, that is, the occurrence of deviation of the center of the web is suppressed as much as possible. Is extremely important from the viewpoint of product quality.

Conventionally, the following method has been known as a method for preventing the web center of the H-section steel from being shifted. (1) As shown in FIG. 1, the web guides 2 and 2 'are attached to the horizontal rolls 1 and 1' of the Ru and Fu stands, and the web 7 of the material 11 to be rolled and the web guides 2 and 2 'are connected. The material to be rolled 11 is guided to the center of the upper and lower rolls by reducing the gap.

(2) As shown in FIG.
The flanges 6, 6 'of the H-section steel are pressed down in the width direction by the flange rolling portions 5, 5' of the screws 4, 4 ', so that the upper and lower flange widths are made uniform.

[0005]

However, the method (1) has a limit in reducing the space between the upper and lower web guides 2 and 2 'to reduce the gap between the upper and lower web guides 2 and 2'. The minimum value of the gap (A + B in FIG. 3) between the web guide and the web is 5 to prevent scratches and accidents, because the web guide rubs the web and scratches the web, or causes an accident by piercing the web guide. Must be 10 mm.

On the other hand, the offset of the center of the web (= (C in FIG. 4)
-D) / 2) is JIS tolerance ± 2.
Since it is defined as 5 ± 3.5, in order to produce an H-section steel, it must be smaller than the above-mentioned gap. That is, when the product A is 3 mm in FIG. 3, if the product comes out as it is, the deviation is 3 mm, which deviates from the product having a tolerance of ± 2.5, and even the product having a tolerance of ± 3.5 is at the margin of tolerance. Therefore, one-sided adjustment is required. In the case of continuous rolling, if the tolerance is ± 3.5, ±
It is necessary to set it to 2.5.

In the above method (2), reversing rolling is performed by using edger rolls 4, 4 'and a roughing mill (Ru). The flange length (==) of the edger roll is used.
E) in FIG. 5 is fixed, so that the conventional hole type (calibur) is used.
In the case of the shape, the gap between the web 7 of the material and the web rolling portion of the edge roll cannot be reduced in each pass, so that the deviation becomes large.

Further, as shown in FIG. 6, by making the F dimension of the Ru inlet material substantially equal to the E dimension of FIG.
Material web and edger in each pass of edger roll
Although the gap between the roll and the web portion can be reduced, since the F dimension of the Ru inlet material is fixed,
The number of passes in a breakdown mill (BD mill) increases.

SUMMARY OF THE INVENTION The present invention provides an edge roll and an edge roll capable of effectively preventing the center of the web from being deviated or significantly reducing the size of the edge roll in comparison with the conventional method. An object of the present invention is to provide a method for rolling an H-section steel using the method.

[0010]

According to the present invention, there is provided an edge roll having upper and lower edge rolls which form a roll hole of an H-section steel. The rolled flange is formed with a groove (step) into which the flange of the H-shaped steel fits.

Further, the rolling method of the present invention is characterized in that the rolling of the material to be rolled by hot rolling with a roll form is sequentially repeated for a plurality of types of roll forms so that a predetermined rectangular steel ingot can be formed. In a rolling method for forming an H-section steel having a cross-sectional shape, a groove is formed in a flange rolling section of an edge roll forming the groove, and a web rolling section of the edge roll and an H-section steel are formed. The method is characterized in that the H-shaped steel flange is guided to the concave groove from the initial pass to the final pass by rolling the web in contact or close proximity.

In short, the present invention is to form a groove in a flange rolled portion of an edge roll and to roll the web roll of the edge roll and an H-section steel in contact or close proximity. The gist of the invention is that the center of the web is effectively prevented from being shifted.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings. Edger roll 4 of the present invention
As shown in FIGS. 7 and 8, a groove 4 'is provided at the end of the flange rolls 8, 8' on the side of the web rolls 9, 9 '.
0, 10 '.

The concave grooves 10, 10 'are formed in the longitudinal direction of the flange rolled portions 8, 8', and the depth thereof is determined by the flanges 6, 6 of the H-section steel (rolled material) 11 in the final pass. 'The length is such that both ends touch. The flange rolling sections 8, 8 '
The flanges 6, 6 'of the material to be rolled are formed on an inclined slope so as to be easily moved inward.

The web 7 of the material to be rolled 11 is rolled in contact with or close to the edge rolls 4, 4 '.
Specifically, the contact or proximity is preferably about 0 to 2 mm. Thus, the H-shaped steel 11 in which the center position of the web thickness substantially coincides with the center position of the flange width is obtained.

FIG. 9 shows a state in which rolling is performed from an initial pass to a final pass, and edge rolls 4, 4 'are shown.
Is always in contact with or near the web 7 of the material to be rolled. There is a gap between the tip of the flange 6 (6 ') of the material to be rolled 11 and the concave grooves 10, 10' of the flange rolled portion 8 (8 ') in the initial pass state, but in the final pass state. ing. By rolling in this manner, the center position of the web thickness of the H-section steel 11 in the final pass state completely matches the center position of the flange width.

As shown in FIG. 9, for each pass of the edge roll, the portion where the flange rolled portion 8 of the edge roll contacts the material 11 to be rolled is different. As shown in FIG. 10, at the time of the initial pass, the material 11 to be rolled contacts the portion B of the flange rolling section 8, and at the time of the final pass, the material to be rolled 8
Part A. The length T 'of the portion A is preferably set to be approximately (1) to 5 mm (thickness (T) of the flange of the product H-section steel).

As shown in FIG. 10, the portion from the portion B to the portion A is formed on an inclined surface. By forming in this way, the flange is smoothed to the part A over the final pass.
Can lead to The angle α of the inclined surface is 10 to 45
° It is good to form. The depth L of the concave groove 10 is
The thickness is preferably about 2 to 20 mm.

FIGS. 11 and 12 show a conventional rolling method. FIG. 11 shows an initial pass and FIG. 12 shows a final pass. At the time of the initial pass, as shown in FIG. 11, the web rolling portions 9 and 9 'of the edge roll are in contact with the web 7 of the material to be rolled.
As shown in FIG. 2, a gap 13 is formed between the web rolling sections 9 and 9 ′ and the web 7. Thus, in the conventional method,
Since the gap 13 is inevitably formed, the center of the web is shifted.

According to the present invention, since the recessed groove in which the flange of the material to be rolled is formed is formed in the flange rolled portion of the edge roll, the web rolled portion of the edge roll is formed as follows.
In the state of being in contact with or close to the web of the material to be rolled, rolling can be performed up to the final pass, so that the lengths of the upper and lower flanges of the H-section steel are uniform, so that the offset of the center of the web is extremely small as compared with the conventional method. can do.

Further, according to the present invention, the F dimension (FIG. 6) of the Ru inlet material can be freely set, so that the number of passes in a breakdown mill (BD mill) can be reduced. In the conventional method, F (FIG. 6) = E (FIG. 5) ± 2 to 3 mm
However, in the method of the present invention, F = E ± 10 to 15 mm
It is because it can be.

That is, when F = E−10 to 15 mm,
Since the hole depth of the BD mill can be small, the roll basic unit of the BD mill can be reduced, and the material used is small, so that the number of BD passes can be reduced. F = E + 10-15
mm, if the material used is a beam blank, the BD
The number of passes decreases.

[0023]

According to the present invention, the deviation of the center of the web can be prevented or significantly reduced as compared with the conventional method, and the range of the F dimension of the Ru inlet material can be expanded. , The number of passes can be reduced, and a good quality product can be provided at low cost.

[0024]

[Brief description of the drawings]

FIG. 1 is a side view showing a conventional rolling method.

FIG. 2 is a side view showing another conventional rolling method.

FIG. 3 is a schematic front view of the conventional rolling method of FIG.

FIG. 4 is a front view of an H-shaped steel obtained by a conventional method.

FIG. 5 is a schematic front view of a conventional edge roll.

FIG. 6 is a front view of a conventional material to be rolled.

FIG. 7 is a cross-sectional view illustrating an initial pass of the embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a last pass in the embodiment of the present invention.

FIG. 9 is a partial sectional view of the method of the present invention from an initial pass to a final pass.

FIG. 10 is a partial sectional view of an edge roll according to the present invention.

FIG. 11 is a sectional view showing an initial pass in a conventional method.

FIG. 12 is a cross-sectional view showing a final pass in a conventional method.

[Explanation of symbols]

 4,4 'Edge roll 5,5' Flange rolled part 6,6 'F-shaped steel flange 7 H-shaped steel web 9,9' Web rolled part 10,10 'Concave groove 11 Rolled material

Claims (11)

[Claims] 1. An edge roll having an H-section steel roll hole formed by upper and lower edge rolls.
A stepped edge roll formed with a concave groove into which a flange portion of a shaped steel fits. 2. The edge roll according to claim 1, wherein the concave groove is formed at an end of the flange rolling section on the web rolling section side in a longitudinal direction of the flange. 3. The edge roll according to claim 1, wherein the depth of the concave groove is formed so that both ends of the flange of the product H-section steel are in contact with each other. 4. The opposed flange rolling portion is formed on an inclined surface whose opposite surface expands inward.
Or the edge roll according to 3. 5. An edge roll according to claim 1, wherein a boundary wall between said flange rolling portion and said groove is formed as an inclined surface. 6. An H-shaped steel having a predetermined cross-sectional shape is obtained from a rectangular parallelepiped steel ingot by successively repeating rolling of a material to be rolled by a hot roll die for a plurality of types of roll die. In the rolling method for forming, a concave groove is formed in a flange rolling portion of an edge roll forming the die, and the web rolling portion of the edge roll and the web of the H-section steel are in contact with or in close proximity to each other. Wherein the flange of the H-section steel is guided to the concave groove from the initial pass to the final pass. 7. A web rolling section of said edge roll and said H
The rolling method according to claim 6, wherein the gap between the section steel and the web is 0 to 2 mm. 8. The rolling method according to claim 6, wherein the concave groove is formed at an end of the flange rolling portion on the web rolling portion side in a longitudinal direction of the flange. 9. The opposed flange rolling portion is formed on an inclined surface whose opposite surface expands inward.
The rolling method according to any one of items 1 to 8, above. 10. An edge roll according to claim 6, wherein a boundary wall between said flange rolled portion and said concave groove is formed as an inclined surface. 11. The rolling method according to claim 6, wherein the flange height of the edge roll is substantially the same for the plurality of types of roll holes.