JPH08215703A - Equipment for manufacturing cut tee - Google Patents

Abstract

PURPOSE: To provide a cut tee manufacturing equipment with which the straightness of the cut tee is ensured, the man-hour and manufacturing term at the time of manufacture are shortened and the cut tee is manufactured by cutting the web of a wide flange shape at high efficiency. CONSTITUTION: This equipment is provided with horizontal rolls 11-14 with which the web of the wide flange shape 1 is reduced and which are in contact with the inner side faces of the flange 2 and vertical rolls 15 for respectively reducing both outer side faces of the flange and has a light-reduction universal mill 10 for cutting or preliminarily working the web while decreasing residual stress in the wide flange shape. And, this equipment is provided with the horizontal rolls 21 with which the web 3 is reduced and which is in contact with the inner side faces of the flange and vertical rolls 22 for respectively reducing both outer side faces of the flanges and has a roller straightening machine 20 for correcting the shape or for shearing and correcting the shape of the wide flange shape 1 sheared or prelimiarily worked with the light-reduction universal mill 10.

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 / T-longe section steel (hereinafter simply referred to as a cut T-section steel) 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-section steel has been used as a building steel material, but in recent years, its application has been expanded as a ship-building section steel as a hull reinforcing member. Since this T-shaped steel is easy to manufacture, it is common to shear the web of the H-shaped steel to manufacture it into the shape shown in FIG. Therefore, when the H-section steel web is subjected to gas shearing, for example, bending toward the flange side occurs as shown in FIG. This is because, as shown in FIG. 7, there is a compressive residual stress in the rolled H-section steel web and a tensile residual stress in the flange, and the residual stress is released by the shearing of the web. It is a phenomenon that occurs because of being.
This phenomenon has become more prominent due to the recent trend toward thin web H-shaped steel for the purpose of reducing the unit consumption of steel materials.
If the bend shown in FIG. 6 is corrected and straightened, the web is compressed and the buckling shown in FIG. 8 occurs, resulting in a marked decrease in commercial value. The bending direction of T-shaped steel is shown in Fig. 1.
0, and takes a positive or negative value depending on the direction.

In order to prevent such a phenomenon, generally, the web is preheated and sheared, or the method described in Japanese Patent Laid-Open Publication No. Hei 4-
As disclosed in Japanese Patent No. 81225, a method is adopted in which a part of the web is left uncut and then sheared.
The T-section steel thus sheared is bent toward the web side as shown in FIG. The cut T-section steel is generally straightened by using 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 conventional production of the cut T-section steel, since the residual stress of the flange of the H-section steel before web shearing is not reduced, for example, a laser shearing machine or 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 in which a part of the web is left uncut and sheared is inevitable, and high-efficiency shearing cannot be performed.

In general, a roller straightening machine or a press straightening machine is also used for straightening the bend of cut T-section steel after shearing. In that case, the shearing location of the cut T-section steel and the straightening machine are used. Are often located far apart in terms of equipment layout. Therefore, the number of man-hours for handling the cut T-section steel after shearing increases, and due to problems such as securing the corrective timing, the process often takes a long time, and it cannot be said to be a work with good productivity. It was

The present invention has been made in order to solve the above-mentioned problems, and secures the straightness of the cut T-section steel, shortens the man-hours and the construction period at the time of production, and improves the H-section steel. An object of the present invention is to provide an apparatus for producing a cut T-section steel capable of producing a cut T-section steel by shearing a web with high efficiency.

[0007]

An apparatus for producing a cut T-section steel according to an aspect of the present invention includes a first horizontal roll that rolls down a web of H-section steel and abuts an inner surface of a flange. A light rolling universal rolling machine that includes a first vertical roll that rolls down both outer side surfaces of the flange and that performs web shearing or pre-working while reducing the residual stress of the H-section steel,
Second for pressing down the web and abutting the inner surface of the flange
No. 2 horizontal rolls and second vertical rolls for rolling down both outer side surfaces of the flange, respectively, and roller straightening for H-shaped steel sheared or pre-processed by a light rolling universal rolling mill Have a machine. An apparatus for producing a cut T-section steel according to another aspect of the present invention is the above-described apparatus for producing a cut T-section steel, in which the first horizontal roll of the light reduction universal rolling mill is provided on the inner surface of the flange of the H-section steel. It has a diameter difference of up and down point symmetry with the abutting horizontal roll.
A horizontal roll for shearing the shaped steel web. An apparatus for producing a cut T-section steel according to another aspect of the present invention reduces a web of H-section steel and also reduces a first horizontal roll that abuts an inner side surface of a flange and both outer side surfaces of the flange. The first vertical roll is provided, and a light reduction universal rolling machine that shears the web while reducing the residual stress of the H-section steel in which the web has been shear pre-processed in hot rolling, and a web that is used to roll down the flange and the flange. A roller for straightening the shape of the T-shaped steel sheared by the light rolling universal rolling machine, comprising a second horizontal roll that abuts the inner surface and a second vertical roll that rolls down both outer surfaces of the flange. Have. An apparatus for producing a cut T-section steel according to another aspect of the present invention is the apparatus for producing a cut T-section steel as described above, wherein the first horizontal roll of the light reduction universal rolling mill is pre-sheared into a web in hot rolling. It has a horizontal roll that abuts the inner surface of the flange of the H-shaped steel that has been subjected to, and a horizontal roll that shears the web. An apparatus for producing a cut T-section steel according to another aspect of the present invention reduces a web of H-section steel and also reduces a first horizontal roll that abuts an inner side surface of a flange and both outer side surfaces of the flange. H with a first vertical roll and pre-shearing of the web in hot rolling
A light rolling universal rolling mill that reduces the residual stress of shaped steel, a second horizontal roll that rolls down the web and contacts the inner surface of the flange, and a second vertical roll that rolls down both outer surfaces of the flange. And a roller straightening machine for shearing and straightening the shape of the H-section steel whose residual stress has been reduced by a light rolling universal rolling mill. An apparatus for producing a cut T-section steel according to another aspect of the present invention is the apparatus for producing a cut T-section steel described above, wherein the second horizontal roll and the second vertical roll are the shafts of the second horizontal roll. Is supported so as to be relatively movable in the direction, and pressurizes and controls the flange of the H-section steel. Furthermore,
An apparatus for producing a cut T-section steel according to another aspect of the present invention is the above-described apparatus for producing a cut T-section steel, which is provided downstream of the roller straightening machine and finishes the sheared cut T-section steel web end surface. It is equipped with a device.

That is, according to the present invention, the residual stress is removed while rolling down the root portion (fillet portion) of the web by rolling down the first vertical roll of the light rolling universal rolling mill, and at the same time, H is fed by the first horizontal roll. Pre-processing for shearing the shaped steel web is performed, and then the web and flange are pinched by the second horizontal roll and the second vertical roll by the roller straightening machine, and repeatedly bent by the upper and lower rolls and left and right bends. While performing the shearing of the web and straightening of the cut T-section steel, the above object is achieved.

[0009]

First, the operation of the present invention will be described with reference to FIG.
FIG. 1A is a diagram showing the configuration of the present invention and the principle thereof. Residual stress removal of the H-section steel 1 and shear pre-processing of the web 3 are performed by the light rolling universal rolling machine 10. After that, the horizontal roll 2 is continuously rolled by the roll straightener 20.
The web 3 is sheared and straightened by repeatedly bending the web 3 vertically and horizontally by the vertical rolls 1 and 22. The stand on which the vertical rolls 22 are installed is preferably all stands in order to effectively exert the left-right bending effect, but since the left-right bending can be given also by the interaction with the vertical rolls 15 of the light reduction universal rolling mill 10. , The effect is exhibited if it is installed on at least one or more of the stands which are bent by the web reduction.

FIG. 1 (b) is a light reduction universal rolling mill 1
It is a figure explaining the mechanism of 0, and its action. This light reduction universal rolling mill 10 includes a horizontal roll 1 which is disposed close to the vertical roll 15 and the inner surface of the flange 2 of the H-section steel 1.
1 and 12 reduce the residual stress at the root (fillet portion) of the flange 2 and the web 3. Further, the vertical bending is also corrected to some extent by this reduction. Also, the horizontal roll 1 in the center of the web 3
The rolls 3 and 14 are arranged vertically 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 rolls 15 can be controlled by changing the load distribution of the vertical rolls 15 between the left and right flanges 2 when the residual stresses at the roots of the flanges 2 of the H-section steel 1 are different. In this case, the asymmetry of the residual stress is not known until after the cut T shearing, so in many cases, a large reduction is applied to both flanges 2 so that the bending becomes as shown in FIG. 9 after shearing. In addition, a method of passing the roller straightening machine 20 that straightens up, down, left and right by the subsequent vertical roll 22 and horizontal roll 21 is effective.

FIG. 1C is a view for explaining the mechanism of the roller straightening machine 20 and its operation. The roller straightening machine 20 uses the above-described light reduction universal rolling machine 10 to form the web 3
And H-section steel that has been pre-machined to reduce the residual stress of the flange 2 and cut the web 3 or the web 3 has been sheared. Since the residual stress of the web 2 and the flange 3 which have passed through the light reduction universal rolling machine 10 is basically as shown in FIG. 9, the vertical roll 22 is indispensable for straightening the shape by right and left bending straightening. is there. The vertical roll 22 and the inner surface of the horizontal roll 21 provide left-right bending. The horizontal roll 21 is also used for straightening up and down.
Are removed by repeated bending. In addition, vertical roll 2
2 and the horizontal roll 21 are supported so as to be relatively movable in the axial direction of the horizontal roll 21, and can correspond to H-section steels having different sizes.

FIG. 2 is a view for explaining the mechanism and operation of another embodiment of the light reduction universal rolling mill 10. In this embodiment, conventional type rolls 11 and 12 are introduced into the web reduction roll 14 of the light reduction universal rolling mill 10, which is used for a web as shown in FIG. 3 in a hot finish rolling mill. It is applied when the pre-processed rolling is performed and is sheared by the shearing roll 16.
Further, when the H-shaped steel is subjected to the above pre-working in hot rolling, the shearing / pre-working rolls are not used in the light reduction universal mill 10 and only residual stress is removed. The subsequent roll straightening machine 20 can repeatedly bend and shear.

It is desirable to install the vertical rolls 22 for laterally bending these cut T-shaped steels at each stage of the conventional web pressing roller, and the effect is exhibited whether they are driven or not. It is a thing. Of course, it can be applied to both a cantilever type and a double-sided type straightener. Then, by properly laying a guide for properly inserting the straightening machine of the present invention, a vertical roller set spacing adjusting device, a vertical position adjusting device, and a driving device, it is possible to continuously cut H-section steel with various cross-sectional dimensions. Effective correction is possible.

FIG. 6 is a diagram showing the relationship between the devices 10 and 20 according to the present invention and the equipment arranged downstream thereof. A cut T-section steel conveying table 30 is provided downstream of the light reduction universal rolling machine 10 and the roll straightening machine 20, and the cut T-section steel conveyed thereby is subjected to a predetermined treatment by an end surface finishing machine 40. That is, the end surface finishing machine 40 finishes the sheared cross section of the web portion of the cut T-section steel that has been cut into two pieces, and sends it to the cut T-section unloading table 60 via the cut T-section steel transport table 50.

[0015]

【Example】

Example 1. The effects of the cut T-section steel manufacturing apparatus (FIG. 1) according to this example are shown in comparison with the conventional method. Table 1 is a table showing the specifications of the manufacturing apparatus. Further, Table 2 is a table showing the operating conditions of the manufacturing apparatus. Table 3 is a table showing the effect of the method of the present invention in comparison with the conventional method.

[0016]

[Table 1]

[0017]

[Table 2]

The "offset position setting" here is # 2
With the roll position as a reference, a positive value is set on the free side and a negative value is set on the drive side in the horizontal roll axis direction.

[0019]

[Table 3]

It can be seen that the straightening according to this embodiment maintains the straightness after the cut T and realizes high-efficiency manufacturing. In addition, significant rationalization of personnel has been achieved.

[0021]

As described above, according to the present invention, in a light reduction universal rolling mill, a web of H-section steel is reduced by a first horizontal roll, and a first horizontal roll and a first horizontal roll are used.
By pressing down the flange with the vertical roll of
The residual stress of the H-section steel is reduced, the web is sheared, pre-processed, and the like. Further, in the roller straightening machine, the web is rolled down by the second horizontal roll, and the second horizontal roll and the second horizontal roll are pressed. By pressing down the flange with a vertical roll, H processed by a light rolling universal mill
Since the shape of the shaped steel is corrected and sheared,
The straightness of the cut T-section steel is secured, the number of man-hours and the manufacturing period are shortened, and the H-section steel web 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 the web was sheared was controlled by the shearing method, and it was manufactured by a method that requires man-hours and a period of time. According to the present invention, the cutting T
It is possible to manufacture steel.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention, (a)
Is a diagram showing the configuration of the present invention and its principle, (b) is a diagram showing the configuration and operating principle of a light reduction universal rolling mill,
(C) is a figure showing the composition and operation principle of a roller straightener.

FIG. 2 is a diagram showing another configuration example of the light rolling universal rolling mill of the present invention and its operating principle.

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

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

FIG. 5 is a diagram showing a manufacturing process of the cut T-section steel after the roll straightening machine.

FIG. 6 is a perspective view of H-section steel with the web sheared without reducing residual stress.

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

FIG. 8 is a diagram showing a buckling situation that occurs when the curved cut T-section steel of FIG. 7 is straightened.

FIG. 9 is a diagram showing a state in which the web is preheated and sheared, or a part of the web is left uncut and then sheared while being controlled so as to bend toward the web side. .

FIG. 10 is an explanatory diagram showing the directions of bending and the meanings of reference numerals.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Watanabe 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. Inside the Steel Pipe Corporation (72) Inventor Atsushi Watanabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Pipe Corporation

Claims (7)

[Claims] 1. A first horizontal roll that rolls down a web of H-section steel and abuts an inner surface of a flange, and a first vertical roll that rolls down both outer surfaces of the flange, respectively.
A light rolling universal rolling mill that cuts or pre-processes the web while reducing the residual stress of the shaped steel, and a second rolling mill that rolls down the web and contacts the inner surface of the flange.
Roller for straightening the shape of the H-section steel that has been sheared or pre-processed by the light rolling universal rolling machine, or for shearing / shape-correcting the horizontal roll and the second vertical roll that rolls down both outer surfaces of the flange. An apparatus for producing a cut T-section steel, which has a straightening machine. 2. The H-shaped web of the first horizontal roll of the light-rolling universal rolling mill has a diameter difference in vertical symmetry with the horizontal roll abutting the inner surface of the H-shaped steel flange. An apparatus for producing the cut T-shaped steel according to claim 1, further comprising a horizontal roll for shearing the. 3. A hot rolled H-shaped steel web is provided with a first horizontal roll that is in contact with the inner surface of the flange and a first vertical roll that is pressed down on both outer surfaces of the flange. A web mill that reduces the residual stress of the H-section steel pre-sheared by the web while shearing the web, and a second rolling mill that reduces the web and abuts the inner surface of the flange.
And a second vertical roll for respectively rolling down both outer side surfaces of the flange, and a roller straightening machine for straightening the T-section steel sheared by the light rolling universal rolling machine. Equipment for manufacturing cut T-section steel. 4. The first horizontal roll of the light reduction universal rolling mill comprises a horizontal roll that comes into contact with an inner surface of a flange of H-section steel whose web is pre-sheared in hot rolling, and the web. The apparatus for producing a cut T-shaped steel according to claim 3, further comprising a horizontal roll for shearing. 5. A hot roll is provided with a first horizontal roll that rolls down the H-section steel web and abuts against the inner surface of the flange, and a first vertical roll that rolls down both outer surfaces of the flange. A light rolling universal rolling mill that reduces the residual stress of the H-section steel that has been pre-sheared by the web, and a second rolling mill that rolls down the web and abuts the inner surface of the flange.
And a second vertical roll for respectively rolling down both outer side surfaces of the flange, and a roller straightening machine for shearing and straightening the H-section steel whose residual stress has been reduced by the light rolling universal mill. An apparatus for producing a cut T-shaped steel, which is characterized in that 6. The second horizontal roll and the second vertical roll of the roller straightening machine are supported so as to be relatively movable in the axial direction of the second horizontal roll, and have an H-shaped steel flange. The apparatus for manufacturing the cut T-section steel according to claim 1, wherein pressure control is performed. 7. The cut according to claim 1, further comprising a device which is provided downstream of the roller straightening machine and which finishes a sheared cut T-section steel web end surface. T-section steel manufacturing equipment.