JP3183083B2 - Manufacturing equipment for cut T-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 an apparatus for producing a cut T-section steel and a T-section steel section (hereinafter simply referred to as a cut T-section steel section) obtained by shearing an H-section steel web.
In particular, it relates to its straightness and its productivity.

[0002]

2. Description of the Related Art Conventionally, T-shaped steel has been used as a steel material for building. However, in recent years, its use has also been expanded as a steel for shipbuilding as a hull reinforcing member. Since this T-section steel is easy to manufacture, it is common to shear the web of the H-section steel to produce the shape shown in FIG. Therefore, when the web of the H-section steel is gas-sheared, for example, bending to the flange side occurs as shown in FIG. This is because, as shown in FIG. 7, there are compressive residual stresses in the rolled H-section steel web, tensile residual stresses in the flange, and release of these residual stresses by web shearing. This is a phenomenon that occurs because
This phenomenon has become more remarkable due to the recent use of thin web H-shaped steels for the purpose of reducing the unit consumption of steel materials.
If the bend shown in FIG. 6 is straightened and straightened, the web is compressed, causing buckling as shown in FIG. 8, and the commercial value is significantly reduced. The bending direction of the T-section is shown in FIG.
0, and takes a positive or negative value depending on the direction.

In order to prevent such a phenomenon, the web is generally preheated and sheared.
As disclosed in Japanese Patent No. 81225, a method is employed in which a part of the web is left uncut and then sheared.
The T-section steel thus sheared is bent toward the web as shown in FIG. The cut T-shaped steel is generally straightened by using a straightening device such as a roller straightening machine, a press straightening machine or a straightening device as disclosed in JP-A-4-81225. ing.

[0004]

As described above, in the production of the conventional cut T-section steel, since the residual stress of the flange of the H-section steel before the web shearing is not reduced, for example, a laser shearing machine, Even when using a shearing machine capable of high-speed shearing such as a plasma arc shearing machine, preheating of the web,
Alternatively, a method of shearing while leaving a part of the web inevitably had to be adopted, and high-efficiency shearing could not be performed.

[0005] Further, it is common to use a roller straightening machine or a press straightening machine also for straightening a cut T-section steel after bending. In that case, the shearing place of the cut T-section steel and the straightening machine are used. Are often located far apart on the equipment layout. Therefore, man-hours for handling the cut T-section steel after shearing, etc. increase, and due to problems such as securing the straightening timing, the process is often long, and it cannot be said that this is a work with good productivity. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made to ensure the straightness of a cut T-section steel, shorten the man-hours and time required for manufacturing, and reduce An object of the present invention is to provide an apparatus for manufacturing a cut T-section steel, which is capable of producing a cut T-section steel by shearing a web with high efficiency.

[0007]

According to one aspect of the present invention, there is provided an apparatus for manufacturing a cut T-section steel, comprising: a first horizontal roll for rolling down an H-section steel web and abutting against an inner surface of a flange; A first vertical roll for rolling down both outer surfaces of the flange, and a light rolling universal rolling mill for shearing the web while reducing the residual stress of the H-section steel on which the web has been pre-sheared in hot rolling And squeeze the web,
And a second horizontal roll abutting against the inner surface of the flange, and second vertical rolls respectively reducing both outer surfaces of the flange, and a roller straightening device for correcting the shape of a T-shaped steel sheared by a light rolling universal rolling mill. Machine. Further, in the apparatus for producing a cut T-section steel according to another aspect of the present invention, in the above-described apparatus for producing a cut T-section steel, the first horizontal roll of the universal rolling mill under light reduction shears the web in hot rolling. It has a horizontal roll abutting on the inner surface of the pre-processed H-section steel flange, and a horizontal roll having a symmetrical diameter difference between the upper and lower points and shearing the web. In addition, the apparatus for manufacturing a cut T-section steel according to another aspect of the present invention reduces the web of the H-section steel, and contacts the first horizontal roll contacting the inner surface of the flange and the outer surfaces of the flange respectively. A light rolling universal rolling mill comprising a first vertical roll for rolling, reducing the residual stress of an H-section steel having a web pre-sheared in hot rolling; A roller straightening machine that includes a second horizontal roll that abuts and second vertical rolls that respectively reduce both outer surfaces of the flange, and that shears and shapes the H-section steel whose residual stress has been reduced by a light rolling universal rolling mill. And In addition, the apparatus for manufacturing a cut T-section steel according to another aspect of the present invention reduces the web of the H-section steel, and contacts the first horizontal roll contacting the inner surface of the flange and the outer surfaces of the flange respectively. A light rolling universal rolling mill that includes a first vertical roll that reduces the pressure, reduces the residual stress of the H-section steel formed by hot rolling, and pre-shears the web; A roller for shearing and correcting the shape of an H-section steel pre-sheared by a light rolling universal rolling mill, comprising a second horizontal roll abutting on the inner surface, and second vertical rolls respectively reducing both outer surfaces of the flange. It has a straightening machine. Moreover, the manufacturing apparatus of the cut T-section steel which concerns on another aspect of this invention WHEREIN: In the said manufacturing apparatus of each cut T-section steel, the 2nd horizontal roll and the 2nd vertical roll are the 2nd horizontal roll. Are supported to be relatively movable in the axial direction of
The flange of the section steel is pressurized. Further, the apparatus for manufacturing a cut T-section steel according to another aspect of the present invention includes the above-described cut T-sections.
The apparatus for manufacturing a section steel is provided with a device provided downstream of the roller straightening machine to finish the web end face of the cut cut T-section steel.

That is, according to the present invention, the residual stress is removed while reducing the root portion (fillet portion) of the web by the reduction of the first vertical roll of the light reduction universal rolling mill. Pre-working etc. for shearing the web of the shaped steel is performed, and subsequently, the web and the flange are pinched by the second horizontal roll and the second vertical roll by the roller straightener, and repeatedly bent by the upper and lower rolls and left and right bent. While performing, the web is sheared and the cut T-shaped steel is straightened to achieve the above object.

[0009]

First, the operation of the present invention will be described with reference to FIG.
FIG. 1A is a diagram showing the configuration and principle of the present invention. The residual rolling of the H-section steel 1 and the pre-shearing of the web 3 are performed by the universal rolling mill 10 under light pressure. Then continue, the horizontal roll 2 by low-La straightening machine 20
The web 3 is sheared and shaped by repeated bending of the web 1 and the vertical roll 22. The stand on which the vertical rolls 22 are installed is desirably an entire stand for effectively exerting the right-left bending effect, but the left-right bending can be given by the interaction with the vertical rolls 15 of the universal rolling mill 10 under light pressure. If it is installed on at least one or more of the stands to which bending is given by web reduction, the effect is exhibited.

FIG. 1B is a light rolling universal rolling mill 1.
FIG. 4 is a diagram illustrating a mechanism and its operation. The universal rolling mill 10 for light reduction includes a horizontal roll 1 disposed close to the vertical roll 15 and the inner surface of the flange 2 of the H-section steel 1.
This reduces the residual stress at the root (fillet portion) of the flange 2 and the web 3 by the pressure reduction by the first and second members. Also, the vertical bending is corrected to some extent by this reduction. Also, a horizontal roll 1 in the center of the web 3
The rolls 3 and 14 are arranged one above the other with different diameters. The rolls 13 and 14 apply a shearing force to the web 3 to shear or pre-process the center of the web 3. The setting of the vertical roll 15 can be controlled by changing the load distribution of the vertical roll 15 between the left and right flanges 2 when the residual stresses at the roots of both flanges 2 of the H-section steel 1 are different. In this case, since the asymmetry of the residual stress is not known until after the cut T shearing, in many cases, a large reduction is applied to both flanges 2 so that the bending as shown in FIG. In this case, it is effective to pass the roller straightening machine 20 for straightening up, down, left, and right by the subsequent vertical roll 22 and horizontal roll 21.

FIG. 1C is a diagram for explaining the mechanism of the roller straightening machine 20 and its operation. The roller straightening machine 20 is used for the web 3 by the above-described light rolling universal rolling mill 10.
In order to reduce the residual stress in the flange 2 and to cut the web 3, the pre-processed or web 3 is passed through a sheared H-beam. Since the residual stress of the web 2 and the flange 3 which have passed through the light rolling universal rolling mill 10 is basically as shown in FIG. 9, the vertical roll 22 is indispensable in order to correct the shape by the right and left bending correction. is there. A right and left bend is given by the vertical roll 22 and the inner surface of the horizontal roll 21. Also, the straight roll 21 is used to correct the vertical bending.
By repeated bending. In addition, vertical roll 2
The horizontal roll 21 and the horizontal roll 21 are supported so as to be relatively movable in the axial direction of the horizontal roll 21, and can cope with H-shaped steels having different dimensions.

FIG. 2 is a view for explaining the mechanism of another embodiment of the light rolling universal rolling mill 10 and its operation. In this embodiment, the conventional rolls 11 and 12 are provided as the web reduction rolls 14 of the light reduction universal rolling mill 10, which is used in a hot finish rolling mill for forming a web as shown in FIG. This is applied when pre-processed rolling is performed, and is sheared by the shear roll 16.
In addition, when the above-mentioned pre-processing is performed on the H-section steel in hot rolling, the roll for shearing / pre-processing is unnecessary in the light rolling universal rolling mill 10, and only the residual stress is removed, may be'll sheared by repeated bending by subsequent rows La straightener 20.

It is preferable that the vertical rolls 22 to bend left and right be added to the cut T-section steel at intervals and in the number of the vertical rolls at each stage of the conventional web lowering roller. Things. Of course, the present invention can be applied to both cantilever type and doubly supported straightening machines. By properly laying a guide, a vertical roller set interval adjusting device, a vertical position adjusting device, and a driving device for properly inserting the straightening device of the present invention, the continuous cutting of the cut H-section steel having various cross-sectional dimensions can be performed. Effective correction is possible.

FIG. 5 is a diagram showing the relationship between the devices 10 and 20 according to the present invention and equipment arranged downstream thereof. Cut T-shaped steel carrier table 30 on the downstream side of the soft reduction universal rolling mill 10 and the low-La straightener 20 is provided, it cut T-shaped steel that has been conveyed by the predetermined process by the end surface finishing machine 40 is performed. That is, the end face finishing machine 40 finishes the sheared cross section of the web portion of the cut T-shaped steel which has been sheared into two pieces, and sends out the cut T-shaped steel to the cut T-shaped discharge table 60 via the cut T-shaped steel transfer table 50.

[0015]

【Example】

Embodiment 1 FIG. The effect of the apparatus for manufacturing a cut T-section steel (FIG. 1) according to the present embodiment will be described in comparison with a conventional method. Table 1 is a table showing the specifications of the manufacturing apparatus. Table 2 is a table showing operating conditions of the manufacturing apparatus. Table 3 is a table showing the effect of the method of the present invention as compared with the conventional method.

[0016]

[Table 1]

[0017]

[Table 2]

Here, the "offset position setting" is # 2.
This value is positive on the free side and negative on the drive side in the horizontal roll axis direction based on the roll position.

[0019]

[Table 3]

It can be seen that the straightness after the cut T is maintained by the correction according to the present embodiment, and high-efficiency manufacturing is realized. Significant rationalization of personnel has also been achieved.

[0021]

As described above, according to the present invention, in the light rolling universal rolling mill, the web of the H-section steel is reduced by the first horizontal roll, and the first horizontal roll and the first horizontal roll are combined with each other.
By rolling down the flange with the vertical roll of
The residual stress of the H-section steel is reduced, the web is subjected to processing such as web shearing, pre-processing and the like. Further, the web is reduced by a second horizontal roll in a roller straightening machine. By rolling down the flange with vertical rolls, H
Since the shape correction, shearing, etc. of the shape steel were performed,
The straightness of the cut T-section steel is ensured, the man-hour and time required for production are shortened, and the web of the H-section steel can be sheared with high efficiency. That is, in the conventional straightening method, since the residual stress at the base of the flange and the web was not reduced, the bending shape after web shearing was controlled by the shearing method, and the method was manufactured by a method requiring man-hours and work period. According to the present invention, the object is dramatically cut at a high efficiency.
It has become possible to produce steel.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention, in which (a)
Is a diagram showing the configuration and principle of the present invention, (b) is a diagram showing the configuration and operating principle of a light rolling universal rolling mill,
(C) is a figure which showed the structure and operating principle of the roller straightening machine.

FIG. 2 is a view showing another configuration example of the light rolling universal rolling mill of the present invention and the operation principle thereof.

FIG. 3 is a view showing an H-section steel pre-processed by a hot rolling mill.

FIG. 4 is a perspective view showing a cut T-section steel.

FIG. 5 is a diagram showing a manufacturing process of low-La straightening machine and later cut T-shaped steel.

FIG. 6 is a perspective view of an H-section steel whose web has been sheared without reducing residual stress.

FIG. 7 is a diagram showing a residual stress state of an H-section steel manufactured by a normal process.

FIG. 8 is a view showing a buckling state that occurs when the bent cut T-section steel of FIG. 7 is straightened.

FIG. 9 is a view showing a state where a web is preheated and sheared, or a web is partially sheared and then sheared while being controlled to bend toward the web side. .

FIG. 10 is an explanatory diagram showing the direction of the bend and the meaning of the reference numerals.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Makoto Watanabe 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Toru Morimi 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan (72) Inventor Atsushi Watanabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-64-15203 (JP, A) JP-A-58-135704 (JP) JP-A-7-16601 (JP, A) JP-A-60-83702 (JP, A) JP-A-1-5601 (JP, A) JP-A-4-59124 (JP, A) 4-288901 (JP, A) JP-A-5-277502 (JP, A) JP-B-43-8194 (JP, B1) JP-B-49-38980 (JP, B1) JP-B-59-36580 (JP, A) Y2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B21B 1/0 8 B21D 3/05

Claims (6)

(57) [Claims] A first horizontal roll for rolling down an H-section steel web and abutting against an inner surface of a flange; and a first vertical roll for lowering both outer surfaces of a flange. A light rolling universal rolling mill that shears the web while reducing the residual stress of the H-section steel on which the web has been subjected to shearing; and a second rolling mill that reduces the web and abuts against the inner surface of the flange.
A horizontal roll, and a second vertical roll for rolling down both outer surfaces of the flange, and a roller straightener for straightening the shape of the T-section steel sheared by the light rolling universal rolling mill. Equipment for manufacturing cut T-section steel. 2. The first horizontal roll of the universal rolling mill under light reduction includes a horizontal roll abutting on an inner side surface of an H-shaped steel flange whose web has been subjected to shear pre-processing in hot rolling, and an upper and lower point. The apparatus for manufacturing a cut T-section steel according to claim 1, further comprising a horizontal roll having a symmetrical diameter difference and shearing the web. And a first horizontal roll for rolling down the web of the H-section steel and abutting against the inner surface of the flange, and first vertical rolls for lowering both outer surfaces of the flange. A light rolling universal rolling mill for reducing the residual stress of an H-section steel having a pre-sheared web;
A horizontal roll, and a second vertical roll for rolling down both outer surfaces of the flange, respectively, and a roller straightening machine for shearing and shaping the H-section steel having the residual stress reduced by the light rolling universal rolling mill. An apparatus for manufacturing a cut T-section steel. 4. A first horizontal roll for rolling down an H-section steel web and abutting against the inner surface of the flange, and first vertical rolls for lowering both outer surfaces of the flange, respectively, and are hot-rolled. A light rolling universal rolling mill that pre-shears the web while reducing the residual stress of the formed H-section steel; and a second rolling mill that lowers the web and abuts the inner surface of the flange.
A horizontal straight roll, and a second vertical roll for rolling down both outer surfaces of the flange, and a roller straightening machine for shearing and correcting the shape of the H-section steel pre-sheared by the light rolling universal rolling mill. Cut T characterized by
Equipment for manufacturing shaped steel. 5. The second horizontal roll and the second vertical roll of the roller straightener are supported so as to be relatively movable in the axial direction of the second horizontal roll, and a flange of an H-section steel is provided. The apparatus for producing a cut T-section steel according to any one of claims 1 to 4, wherein the apparatus controls pressurization. 6. The cut T-shape according to claim 1, further comprising a device provided downstream of the roller straightening machine, for finishing a web end surface of the sheared cut T-section steel. Steel manufacturing equipment.