JPH09108707A - Manufacturing device of t-steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of processes and the period of production so as to make a T-steel efficiently by decreasing residual stress of an H-steel, applying web cutting or preliminary working to it, correcting its shape vertically and horizontally, and thereby securing the post-cutting straightness of T-steel. SOLUTION: A light screw-down type universal rolling mill 10 removes residual stress while rolling down the root of the web of an H-steel 1 through the reduction by its vertical roll 12, and also cuts the web by the pre-working roll. A roller straightener 20, performing repeated bend and left/right bend by the upper and lower rolls while pinching the web and flange by the horizontal rolls 21, 22 and the vertical roll 23, cuts the web, straightens the T-steel thus cut to produce a cut T-steel. In addition, with the purpose of fully demonstrating this effect, the light screw-down type universal rolling mill 10 is equipped with a driving unit 15 and a reduction gear 16, as is the roller straightener 20 with a driving unit 25 and a reduction gear 26, so that both driving units 15, 25 are properly controlled.

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 or a T-longe section steel obtained by cutting an H-section steel web.
In particular, the present invention relates to ensuring the straightness of these T-section steels and improving the production efficiency.

[0002]

2. Description of the Related Art Conventionally, T-section steel has been used as a steel material for construction, but in recent years, its application has been expanded as a section steel for shipbuilding as a hull reinforcing member. Since this T-section steel is easy to produce, it is common to cut the web of the H-section steel to produce a cut T-section steel having the shape shown in FIG. However, when the H-section steel web is gas-cut, for example, bending to the flange side occurs as shown in FIG. This is due to the presence of compressive residual stress in the rolled H-section steel web and the tensile residual stress in the flange, as shown in FIG. 9, which is released by cutting the web. It is a phenomenon. This phenomenon has become more remarkable due to the thinning of the web of H-section steel in recent years for the purpose of reducing the unit consumption of steel materials.

If the bend shown in FIG. 8 is straightened by straightening it, the web is compressed and buckling occurs as shown in FIG. 10, resulting in a marked decrease in commercial value. In order to prevent this, in general, the web is preheated and cut, or, as proposed in JP-A-4-81225, a part of the web is left uncut and then cut. As shown in FIG. 11, it is adapted to bend to the web side. Note that the bending direction and its reference numeral are as shown in FIG. 12, and in FIG. 11, the bending is in the “+” direction. The cut T-section steel cut in this manner is generally a roller straightening machine, a press straightening machine, or the above-mentioned JP-A-4-81225.
The bending is corrected by using the correction device disclosed in the publication.

[0004]

As described above, in the conventional method for producing the cut T-section steel, since the residual stress in the flange portion of the H-section steel before the web cutting is not reduced, for example, laser cutting is performed. Even if a cutting machine capable of high-speed cutting such as a cutting machine or a plasma arc cutting machine is used, the method of preheating the web or cutting the web by cutting a part of the web must be adopted. I can't. Further, a roller straightening machine or a press straightening machine is generally used also for straightening the bend after cutting the cut T-section steel, but in that case, the cutting place of the cut T-section steel and the straightening machine are In many cases, they are located far apart from each other due to the equipment layout. Therefore, the number of man-hours for handling the cut T-section steel after cutting increases, and due to problems such as ensuring the corrective timing, the process often takes a long time, which is not a work with good productivity. It was Such a problem was the same in the T-longe section steel.

The present invention has been made in order to solve the above problems, and ensures the straightness of the T-shaped steel after cutting, shortens the number of man-hours and the construction period, and improves the efficiency of the T-shaped steel. It is intended to obtain a T-shaped steel manufacturing apparatus for manufacturing In the present invention, the cut T-section steel and the T-longe section steel are collectively referred to as T-section steel.

[0006]

An apparatus for producing a T-section steel according to one aspect of the present invention is a universal rolling mill for reducing the residual stress of an H-section steel and for cutting or preforming a web. It has a roller straightening machine, which is arranged on the downstream side of the light rolling universal rolling mill, straightens the shape of the H-section steel vertically and horizontally, or cuts the web and straightens it. Each straightening machine is controlled independently. In the apparatus for manufacturing a T-section steel according to another aspect of the present invention, the light reduction universal rolling mill includes a pair of upper and lower horizontal rolls respectively abutting the inner surface of the flange of the H-section steel and an outer surface of the flange of the H-section steel. A horizontal roll having a pair of vertical rolls for pressing each other and a pair of pre-processing rolls each of which is arranged between the pair of horizontal rolls and has a diameter difference in vertical symmetry. And the vertical roll are controlled independently of each other.

In the apparatus for manufacturing a T-section steel according to another aspect of the present invention, the light reduction universal rolling mill is in contact with the flange inner surface of the H-section steel on which the web has been shear pre-processed in hot rolling. A pair of upper and lower horizontal rolls, H
It has a pair of vertical rolls that press the flange outer surface of the shaped steel, and a pair of cutting rolls respectively arranged between the pair of horizontal rolls, and the rotation speed of the horizontal rolls and the rotation speed of the vertical rolls. Are controlled independently. In the apparatus for manufacturing a T-section steel according to another aspect of the present invention, the light reduction universal rolling mill is applied to the flange inner surface of the H-section steel of the H-section steel subjected to shear pre-working of the web in hot rolling. It has a pair of upper and lower horizontal rolls that are in contact with each other, and a pair of vertical rolls that press the flange outer surface of the H-section steel,
The rotation speed of the horizontal rolls and the rotation speed of the vertical rolls are independently controlled, and the roller straighteners are alternately arranged one above the other along the length direction of the H-section steel, and are arranged on the inner surface of the flange of the H-section steel. The web is cut by vertically bending the H-section steel, which has a pair of upper and lower horizontal rolls that are in contact with each other and at least one pair of vertical rolls that press the flange outer surface of the H-section steel.

In the apparatus for manufacturing T-section steel according to another aspect of the present invention, the roller straightening machines are alternately arranged in the vertical direction along the length direction of the H-section steel, and are respectively arranged on the inner surface of the flange of the H-section steel. It has a pair of abutting horizontal rolls and at least a pair of vertical rolls that press the flange outer surface of the H-shaped steel, respectively, and the horizontal rolls and the vertical rolls are movably supported in the axial direction of the horizontal rolls, and The rotation speed of the horizontal roll and the rotation speed of the vertical roll are independently controlled. A manufacturing apparatus for T-section steel according to another aspect of the present invention is a laser cutting machine or a plasma arc machine for cutting the web of H-section steel from which residual stress at the root portion of the web is removed by the roller straightening machine in the above-mentioned manufacturing apparatus. It further has a cutting machine. An apparatus for manufacturing a T-section steel according to another aspect of the present invention is the above manufacturing apparatus, further including a web end surface finishing device for finishing the cut web end surface.

[0009]

Next, an embodiment of the present invention will be described. FIG. 1 is a basic configuration diagram of the present invention.
Shows a front view thereof, and FIG. 6 (b) shows a plan view thereof. 2 is a configuration diagram showing the details of the light reduction universal rolling mill, and FIG. 3 is a configuration diagram showing the details of the roller straightening machine. The manufacturing apparatus in the illustrated example includes a light reduction universal rolling mill 10 and a roller straightening machine 20. The light reduction universal rolling mill 10 is equipped with a pair of upper and lower horizontal rolls (web reduction rolls) 11, a pair of vertical rolls 12, and a pair of pre-processing rolls 13 and 14. Further, the roller straightening machine 20 includes a pair of horizontal rolls (web reduction rolls) 21 and 22, which are alternately arranged vertically along the length direction of the H-section steel and respectively come into contact with the inner surface of the flange, and the H-shape. A pair of vertical rolls 23 that press the outer surface of the steel flange,
Equipped with 24.

The light reduction universal mill 10 removes residual stress while reducing the root portion of the web of the H-section steel 1 by the reduction of the vertical roll 12 thereof, and also the pre-forming rolls 13 and 14 together. Pre-processing to cut the. Then, the roller straightener 20 applies the web and the flange to the horizontal rolls 21 and 22 and the vertical rolls 23 and 2.
While pinching with 4, the web is cut and the cut T-shaped steel is straightened while repeatedly bending and laterally bending with upper and lower rolls to manufacture a cut T-shaped net. Further, in order to sufficiently exert this effect, the light reduction universal rolling mill 10 and the roller straightening machine 20 have independent driving devices. That is, the light reduction universal rolling mill 10 is equipped with the driving machine 15 and the speed reducer 16, and the roller straightening machine 20 is equipped with the driving machine 25 and the speed reducer 26. These drive devices 15,
By appropriately controlling 25, the roll speed of the light reduction universal rolling mill 10 and the roll speed of the roller straightening machine 20 are made to have a difference, so that the tension T is generated between the two, so that the effect is more remarkable. I am trying to show it to you.

In the roller straightening machine 20 shown in FIG. 1, the stands on which the vertical rolls 23 are installed are preferably all stands in order to effectively exert the left-right bending effect, but the vertical rolls 12 of the light rolling universal rolling machine 1 are preferable. Since it is possible to give a left and right bend by interaction with
The effect is exhibited if it is installed in at least one or more of the stands that are bent by the web reduction.

In the light-rolling universal rolling machine 10 of FIG. 2, the H-shaped steel 1 is rolled down by the horizontal roll 11 that abuts the inner surface of the flange of the H-shaped steel 1 and the vertical roll 12 that presses the outer surface of the flange, and the flange is And reduce the residual stress at the root of the web. Also, the vertical bending is corrected to some extent by this reduction. In addition, pre-processing roll 1
The rolls 3 and 14 having different diameters are arranged above and below the center of the web portion, and a shearing force is applied to the web by this roll to cut or pre-process the center portion of the web portion.
As for the setting of the vertical roll 12, when the residual stresses at both flange roots of the H-shaped steel are different, it is possible to control by changing the load distribution of the vertical roll 12 by the left and right flanges. Since the asymmetry of the residual stress cannot be known until after cutting T, in many cases, a large amount of reduction is applied to both flanges so that after bending, a bending as shown in FIG. Subsequently, the horizontal rolls 21 and 22 and the vertical rolls 23 are used for straightening up, down, left and right, that is, by passing through the roller straightening machine 20, thereby achieving more efficient straightening. Further, in addition to the above-mentioned reduction, the effect of the tension T due to the speed difference with the roller straightening machine 20 allows the function to be exhibited more efficiently. The roll speed of the horizontal roll 11 and the roll speed of the vertical roll 12 in FIG. 2 are controlled independently of each other, and the tension T as shown is generated by the difference in speed.

In the roller straightening machine 20 of FIG. 3, the light rolling universal rolling machine 10 reduces residual stress of the web and the flange, pre-processes to cut the web, or cuts the web. Straightening shaped steel. Since the residual stress of the web and the flange that has passed through the light reduction universal rolling mill 10 is basically as shown in FIG. 9, a vertical roll 23 is provided to correct the shape of the web and the flange by right and left bending. . Left and right bending is provided by the side surface of the horizontal roll 21 and the vertical roll 23. In addition, vertical rolls 21 and 22 are also used to correct vertical bending.
Are removed by repeated bending. Note that the roll speeds of the horizontal rolls 21 and 22 and the roll speed of the vertical roll 23 in FIG. 3 are also independently controlled.
1, 22 and the vertical roll 23 are movably supported in the axial direction of the horizontal roll. Therefore, the horizontal rolls 21 and 2
For No. 2, the interval can be adjusted according to the H-shaped steel, and for the vertical roll 23, the pressing force can be adjusted.

FIG. 4 is a diagram showing another example of the structure of the light reduction universal rolling mill 10, in which the conventional type cutting roll 15 is arranged as the web reduction roll of the light reduction universal rolling mill 10. This is applied when the web of H-section steel 1 is pre-processed by the hot finishing mill as shown in FIG. Further, when the above-mentioned pre-working is applied to the H-section steel in the hot rolling, only the residual stress is removed without installing the pre-working rolls 13 and 14 or the cutting roll 15 in the light rolling universal rolling machine. Go and do
It can also be cut by repeated bending in the subsequent roller straightening machine 20.

By the way, the installation interval and the number of the vertical rolls 23 for applying the left-right bending to the cut T-section steel are desirably installed at each stage of the conventional horizontal rolls (web reduction rollers) 21 and 22, and it is preferable that the vertical rolls 23 are installed. The effect is exhibited both with and without drive. Of course, cantilever,
Applicable to both cantilever straightening machines. Further, by properly laying a guide for correctly inserting the roller straightening machine 20, a vertical roller pair spacing adjusting device, a vertical position adjusting device, a driving device, etc., it is possible to continuously and effectively cut T-shaped steel having various cross-sectional dimensions. Production becomes possible.

Further, in the above-mentioned apparatus, even H-section steel is cut, but residual stress is sufficiently removed in the apparatus, and thereafter, it is cut by a high-speed cutting apparatus such as a laser cutting machine or a plasma arc cutting machine. It goes without saying that you can do so.

FIG. 7 is a view showing a cut T manufacturing process after the apparatus according to the present invention. In this process, a cut T-section steel transport table 40, a cut T-section steel web end surface finishing device 41, a cut T-section steel transport table 42 and a cut T are provided downstream of the apparatus 30 (see FIG. 1) according to the present invention. The carry-out table 43 is arranged. The cut section of the web portion of the cut T-section steel, which has been cut into two pieces in the apparatus 30 according to the present invention, is passed through the web end surface finishing device 41 for the cut T-section steel to obtain a higher quality cut T-section.
Shaped steel can be manufactured.

Although the above description has been made on the cut T-section steel, the above-described embodiments are similarly applied to the T-longe section steel and have the same effect.

[0019]

【Example】

Example 1 The effect of the cut T-shaped copper manufacturing apparatus (FIG. 1) according to the present invention is shown in comparison with the conventional method. Table 1 shows the specifications of this manufacturing apparatus. Table 2 shows the operating conditions of this manufacturing apparatus. And Table 3
Is the effect of the present invention compared with the conventional method.

[0020]

[Table 1]

[0021]

[Table 2]

[0022]

[Table 3]

As is apparent from Table 3, conventionally, it was necessary to equip a normal straightening machine, a horizontal holding gas cutting machine, and a horizontal holding cutting straightening machine, but in the present invention, only the apparatus of FIG. 1 is sufficient. Moreover, the straightness of the T-shaped steel after cutting is maintained, and high-efficiency manufacturing is realized. In addition, significant rationalization of personnel has been achieved.

[0024]

As described above, according to the present invention, the residual stress of the H-section steel is reduced and the web is cut or pre-processed, and then the H-section steel is straightened in the vertical and horizontal directions or the web is cut. Since the T-section steel is cut and the shape is corrected, the straightness of the T-section steel after cutting is secured, the man-hours and the construction period are shortened, and the T-section steel can be manufactured with high efficiency. .

[Brief description of the drawings]

1A and 1B are diagrams showing a basic configuration of the present invention, in which FIG. 1A is a front view and FIG. 1B is a plan view.

FIG. 2 is a view showing a mechanism of the light reduction universal mill of FIG.

FIG. 3 is a view showing a mechanism of the roller straightening machine of FIG.

FIG. 4 is a view showing another example of the mechanism of the light reduction universal rolling mill of FIG. 1.

FIG. 5 is a view showing the shape of an H-section steel subjected to web pre-processing.

FIG. 6 is a view showing the shape of a cut T-section steel.

FIG. 7 is a view showing a cut T manufacturing process after the device according to the present invention.

FIG. 8 is a diagram showing bending when the web is gas-cut without reducing residual stress.

FIG. 9 is a diagram showing a residual stress condition of an H-section steel manufactured by a normal process.

FIG. 10 is a diagram showing a buckling situation that occurs when the curved cut T-section steel of FIG. 6 is straightened.

FIG. 11 is a diagram showing a state in which a web is preheated and cut, or a part of the web is left uncut, and then the web is cut while being controlled so as to bend toward the web by a cutting method.

FIG. 12 is a diagram showing meanings of bending directions and numeral symbols.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Watanabe 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Toru Morinori 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd. (72) Inventor Minoru Komatsubara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Inventor Yukio Fujii 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Inventor Kiyoo Omori 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Tube Co., Ltd.

Claims (7)

[Claims] 1. The residual stress of H-section steel is reduced, and
A light rolling universal rolling mill for cutting or pre-processing a web, and a downstream side of the light rolling universal rolling mill to correct the shape of the H-section steel in the vertical and horizontal directions, or cut the web and correct the shape. A roller straightening machine, wherein the light rolling universal rolling machine and the roller straightening machine are independently controlled.
Shaped steel manufacturing equipment. 2. The light-rolling universal rolling mill comprises a pair of upper and lower horizontal rolls that abut against the inner surface of the flange of the H-section steel, and a pair of vertical rolls that press against the outer surface of the flange of the H-section steel. And a pair of pre-processing rolls each of which is arranged between the pair of horizontal rolls and has a diameter difference in vertical symmetry, and the rotation speed of the horizontal rolls and the vertical rolls. 2. The T-shaped steel manufacturing apparatus according to claim 1, wherein the rotation speeds of the T-shaped steels are independently controlled. 3. The light-rolling universal rolling mill comprises a pair of upper and lower horizontal rolls respectively abutting inner side surfaces of a flange of H-section steel subjected to shear pre-working of the web in hot rolling, and the H-section steel. Each of which has a pair of vertical rolls that press the flange outer surface and a pair of cutting rolls that are respectively disposed between the pair of horizontal rolls, and the rotation speed of the horizontal rolls and the rotation of the vertical rolls. 2. The T-shaped steel manufacturing apparatus according to claim 1, wherein the speeds are independently controlled. 4. The light-rolling universal rolling mill comprises a pair of upper and lower horizontal rolls respectively abutting inner side surfaces of a flange of H-section steel subjected to shear pre-working of a web in hot rolling, and the H-section steel. And a pair of vertical rolls that press the flange outer surfaces of the vertical rolls, and the rotation speed of the horizontal roll and the rotation speed of the vertical roll are independently controlled,
Further, the roller straightening machine is alternately arranged vertically along the length direction of the H-section steel, and a pair of horizontal rolls respectively contacting the inner surface of the flange of the H-section steel and the outer surface of the flange of the H-section steel. 2. The apparatus for producing a T-shaped steel according to claim 1, further comprising at least one pair of vertical rolls for pressing the H-shaped steel, and cutting the web by bending the H-shaped steel up and down. 5. The pair of roller straightening machines, which are alternately arranged in the vertical direction along the length direction of the H-section steel, and which are in contact with the inner surface of the flange of the H-section steel, respectively, and a pair of horizontal rolls of the H-section steel. At least one pair of vertical rolls that press the flange outer surfaces, respectively, the horizontal rolls and the vertical rolls are supported so as to be movable in the axial direction of the horizontal rolls, and the rotation speed of the horizontal rolls and the vertical rolls. The T-shaped steel manufacturing apparatus according to claim 1, wherein the rotation speeds of the rolls are independently controlled. 6. The T according to claim 1, further comprising a laser cutting machine or a plasma arc cutting machine for cutting the H-section steel web from which the residual stress at the root of the web is removed by the roller straightening machine. Shaped steel manufacturing equipment. 7. The apparatus according to claim 1, further comprising a web end face finishing device for finishing the cut web end face.
The described T-shaped steel manufacturing apparatus.