JP2910606B2 - Roller straightening device for H-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 straightening an H-section steel by using a roller straightening machine for straightening an H-section steel web by bending the web, and more particularly to an apparatus for manufacturing the same by hot rolling or welding. The present invention relates to shape correction of H-section steel.

[0002]

2. Description of the Related Art H-shaped steels manufactured by hot rolling or welding are generally straightened in a cold state and then shipped because of bending or warping as a whole or locally. It is. In many cases, the cold straightening method is performed by press straightening or roller straightening. However, the former is not suitable for mass production because the former is appropriately deformed by a pressing tool while checking the shape before straightening. On the other hand, the latter (roller straightening method) is a method of straightening by repeatedly bending an H-section steel with a large number of rollers.
in use.

FIGS. 8 and 9 show a part of a contact state between a correcting roller and an H-section steel in a conventional roller correcting method, and show the contact state. As can be seen from these figures, the conventional load straightening method of the roller straightening machine includes a web rolling method in which the surface of the web 3 of the H-section steel 1 is loaded by the outer peripheral surface of the roller 4 as shown in FIG. H-shaped steel 1 like 9
There are two types of flange reduction systems in which the end surface of the flange 3 is loaded by the outer peripheral surface of the roller 5. However, whichever rolling down method is employed, the following problems cannot be avoided.

[0004] That is, the drawback of the web rolling method is that, in the case of an H-section steel having a flange width larger than the web thickness, the load by the roller is converted into the radius of the web, and sufficient bending deformation occurs in the flange. Not only does it mean that only the local contact between the roller and the web plastically deforms and can even crack in severe cases. In Japanese Patent Publication No. 57-61488, in order to suppress such local deformation, the shape of a roll for holding the web is devised. Such a method cannot solve the essential problem.

A disadvantage of the flange pressing down method is that when the flange width is large and a large bending load is required, the flange end face in contact with the roller is crushed, and the flange width is greatly reduced. is there. Such problems are described in JP-B-56-40646 and JP-A-53-1.
As proposed in Japanese Patent No. 41158, the load can be reduced to some extent by reducing the load by increasing the distance between the rollers and by increasing the contact area between the roller and the flange by increasing the diameter of the roller. In addition to increasing the size of the equipment and raising construction costs, if the distance between the rollers is increased, the length of the uncorrectable portion at both ends of the H-shaped steel will also be increased, and these means will naturally have limitations. .

[0006]

As described above, it is obvious that the H-section steel having a large cross section cannot be effectively corrected by any of the web reduction method and the flange reduction method. The current state is to adopt a web rolling method. In order to solve the disadvantages of the above two methods, FIG.
(For example, Japanese Patent Publication No. Sho 57-11728), a method has been proposed in which the flange 2 and the web 3 are simultaneously lowered by the rollers 4 and 5, but this method is also distributed to the flange 2 and the web 3. It is difficult to set the load
If the height of the web 3 is also increased and the toes of the flange 2 may be crushed, the mechanism is complicated, and if the web thickness is further reduced, the above-mentioned problems are inevitably exposed.

Japanese Patent Publication No. Sho 56-45684 proposes a rather clever method for lowering the surface pressure applied to the flange when the flange is lowered. Because the speed is different, deformation is induced in the direction of the flange falling, the load on the part that starts to contact the flange and the part that comes off from the contact with the flange increases, and as a straightening machine, a special H-shaped steel machine And so on.

In Japanese Patent Application Laid-Open No. 4-59124,
By providing a vertical roll outside the flange and restraining the flange, the bending rigidity of the web is increased, and the above problem is solved by suppressing the deformation.
Even in the current straightening, the flange is actually restrained by the web reduction roll as shown in FIG.
In this apparatus, the bending stiffness of the web is almost the same as that of a normal method. Therefore, simply restricting the vertical roll does not suppress the change in the height of the web as compared with the conventional method.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a roll straightening apparatus for an H-section steel which can be used even for a large H-section steel having a small web thickness. .

[0010]

According to one aspect of the present invention, there is provided an apparatus for straightening a roll of an H- section steel having a tapered portion on an outer side surface, and a rolling force applied to an inner side of a web and a flange of the H- section steel.
A horizontal roller to be provided, and a tapered portion having a shape corresponding to the horizontal roller. The horizontal roller is pinched together with the horizontal roller to repeatedly bend the vertical bend of the H-beam, and a fillet is formed from the outer surface of the flange. And a vertical roll for applying a compressive force to the portion. Roller straightening device for H-section steel according to another aspect of the present invention is a roller straightening device for H-section steel provided with horizontal rolls that are arranged alternately up and down along the traveling direction of the H-section steel and press down the web, A horizontal roller which has a tapered portion on the outer side surface and applies a rolling force to the inner surface of the flange of the H-section steel, and a tapered portion having a shape corresponding to the horizontal roller, and the flange of the H-section steel is pinched together with the horizontal roller to form an H It has at least one pair of vertical rolls that repeatedly apply bending to the vertical bending of the section steel and apply a compressive force to the fillet portion from the outer surface of the flange.
The H-shaped steel roll straightening device according to still another aspect of the present invention is the H-shaped steel roller straightening device, wherein the taper angle of the horizontal roll having the tapered portion is reduced toward the downstream stage, and The horizontal rollers of the step are arranged so that the taper angle is zero and there is a gap with respect to the web.

That is, according to the present invention, a taper is applied to the outer side surface of the horizontal roll of the conventional roller straightening device, and a rolling force is applied to the inner side surface of the H-section steel flange at the tapered portion. By pinching the flange with a vertical roll having a tapered portion shaped to match the horizontal roll taper, the H-section steel is repeatedly bent and a compressive stress is applied to the web, ie, the fillet portion, from the outer surface of the flange. Thereby, the change in the height of the web is suppressed, and the above object is achieved.

[0012]

First, the operation of the present invention will be described. FIG. 1 shows the configuration of the present invention and its operating principle. FIG.
FIG. 2 is a side view, and FIG. 2B is an explanatory view of the front operation. In this roller straightening device, the horizontal roll 1
Numerals 0 are arranged alternately up and down along the traveling direction of the H-section steel 1, and vertical rolls 20 are provided corresponding to the horizontal rolls 10. The outer side surface of the horizontal roll 10 has a taper inclined toward the center as shown in the figure, and the taper portion 12 applies a rolling force to the inner side surface of the flange 2 of the H-section steel 1. The side portion of the vertical roll 20 is also provided with a tapered portion 22 shaped to match the tapered portion 12 of the horizontal roll 10. The tapered portion 12 of the horizontal roll 10 and the tapered portion 22 of the vertical roll 20 pinch the flange of the H-shaped steel 1 to repeatedly bend the H-shaped steel 1 and, at the same time, use the vertical roll 20 from the outer surface of the flange 2. Apply compressive stress to web 3
By performing control, there is no change in web height, and correction is performed so as not to cause fillet cracks.

Here, the stand on which the vertical rolls are installed is shown as an entire stand, but at least one of the stands provided with a bend is provided with a horizontal roll 10 having a tapered portion, and a vertical roll for reducing the pinch web. If the roll 20 is provided, the effect can be exhibited. However, when the horizontal roller 10 having a tapered portion is provided in multiple stages, the taper angle is reduced toward the downstream stage, the taper angle is set to zero in the final stage horizontal roller, and It is arranged so as to have a gap to it.

Hereinafter, the principle of the present invention will be described. FIG. 2 is a view showing a stress state in a cross section of an H-section steel by the web rolling method. The web 3 is compressed and pulled by the bending by the roll 4, and a similar stress is applied to the fillet portion. Bending is applied to the flange 2 by pressing the web 3, and the toe has compressive and tensile stresses in the longitudinal direction, respectively. Changes in web height and cracks in the fillet are the main causes of this tensile stress.
This needs to be reduced in some way. The present inventors have recognized that the change in the web height and the cracks in the fillet portion are due to tensile stress.To reduce this, the force applied to the web itself should be suppressed as much as possible, and the web It was found that it was necessary to apply compressive stress to the steel.

To this end, a taper is provided on the side surface of the horizontal roll, and the force required for bending the flange is shared by the pinch force with the vertical roll, thereby reducing the force acting on the web. Further, in order to reduce the tensile stress of the web, it is necessary to apply a compressive stress by rolling down the flange from the outer surface to the fillet portion by a vertical roll. FIG. 4 is a diagram showing the stress state at this time. That is, FIG. 4 shows that the H-section steel is repeatedly bent by pinching the flange of the H-section steel by the taper portion of the horizontal roll and the taper portion of the vertical roll, and the vertical roll is applied to the web portion from the outer surface of the flange. It shows a bending stress state in a state where a compressive stress is applied. From this figure, since the force required for bending the flange is reduced by the pinch between the horizontal roll and the vertical roll each having a taper (the force to push down the flange by the pinch force is applied), the absolute level of the stress is reduced. It can be seen that it has dropped and that the harmful tensile stress has been reduced to within the elastic range.

The interval and the number of vertical rolls that apply a compressive stress to the fillet portion while pinching the flange in combination with a horizontal roll having a tapered portion on the outer side surface can be adjusted in each step of the conventional web lowering roller. It is desirable to install the device in any position, and the effect is exhibited regardless of whether the device is driven or not. Further, a vertical roller pair combined with a horizontal roll having a tapered portion of the present invention may be provided only in the front part where the load is large, and the rear part may be a normal web or flange roller straightening. Of course, the present invention can be applied to both cantilever type and doubly supported straightening machines.
By properly laying the guide for correctly inserting the straightening machine of the present invention, the interval adjusting device of the vertical roll set, the vertical position adjusting device, and the driving device of the present invention, the continuous formation of the H-section steel having various cross-sectional dimensions is possible. And effective correction can be achieved.

[0017]

【Example】

Embodiment 1 FIG. The effect of the straightening device (FIG. 1) according to the present embodiment will be described in comparison with the conventional method. Although the overall configuration of the roll straightening device is as shown in FIG. 1, details of each device are as shown in FIG. 5, and the vertical roll 20 is pressed against the flange 2 by a hydraulic cylinder 30-. Controlled. Table 1 is a table showing the dimensions of the material to be corrected and the specifications of the straightening machine. Table 2 is a table showing an intermesh as compared with a conventional web straightening method. Table 3 is a table showing the effect of the present invention as compared with the conventional method.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

According to the straightening of this embodiment, it can be seen that there is no change in the web height as compared with the conventional web drafting straightening. FIG. 6 is a characteristic diagram showing a change in the web height due to the vertical roll reduction. It is also understood from this characteristic that the web height itself can be controlled by the vertical roll reduction load. In addition, it can be seen from this characteristic that simply restraining the plunge by the vertical roll has no effect. In addition, all the data of FIG. 6 have shown the average value. FIG. 7 is a characteristic diagram of the hardness distribution of the fillet portion. The graph shows how the vertical roll reduction affects the flange and the web in terms of hardness. It can be seen that the hardness of the fillet portion is increased by the vertical roll reduction.

Embodiment 2 FIG. The effect of the straightening device (FIG. 1) according to the present embodiment will be described in comparison with the conventional method. Here, the effect when the vertical roll is installed only in the upper roll is shown. Table 4 shows the dimensions of the material to be straightened and the specifications of the straightening machine. Table 5 is a table showing an intermesh as compared with a conventional web straightening method. Table 6 is a table showing the effect of the method of the present invention as compared with the conventional method.

[0023]

[Table 4]

[0024]

[Table 5]

[0025]

[Table 6]

According to the correction according to the present embodiment, it can be seen that there is no change in the web height as compared with the conventional web reduction correction.

Embodiment 3 FIG. Straightening device according to the present embodiment (FIG. 1)
The effect of the above is shown in comparison with the conventional method. Here, the effect in the case where the vertical roll is installed only in the # 2 roll to which the maximum straightening is given is shown. Table 7 is a table showing the dimensions of the material to be corrected and the specifications of the actual machine straightening machine. Table 8 is a table showing an intermesh compared with a conventional web straightening method. Table 9 is a table showing the effect of the present invention as compared with the conventional method.

[0028]

[Table 7]

[0029]

[Table 8]

[0030]

[Table 9]

According to the correction according to the present embodiment, it can be seen that there is no change in the web height as compared with the conventional web reduction correction.

[0032]

As described above, according to the present invention, web breakage
In a state where the bending stress is exerted on the surface by web reduction , the H-shaped steel flange is pinched by a horizontal roller and a vertical roll to repeatedly bend the H-shaped steel up and down, and the outside of the flange is bent by the vertical roll. Since the H-shaped steel is straightened by applying a compressive force to the fillet from the side, appropriate correction is made even for a large H-shaped steel with a small web thickness. Conventionally, there is no effective straightening method. An H-shaped steel that has been straightened with a press while reducing productivity can also be efficiently straightened, and an excellent effect of improving product quality can be exhibited.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention and an operation principle thereof, and FIG. 1A is a side view thereof, and FIG.
FIG.

FIG. 2 is a diagram showing a stress state in a conventional correction method.

FIG. 3 is a view showing a state of constraint of a flange in a conventional method.

FIG. 4 is a diagram showing a bending stress state in the present invention.

FIG. 5 is a diagram showing a configuration of a roll straightening device according to the present invention.

FIG. 6 is a characteristic diagram showing a change in web height due to vertical roll reduction in an example of the present invention.

FIG. 7 is a characteristic diagram of a hardness distribution of a fillet portion in the example of the present invention.

FIG. 8 is a view showing a conventionally proposed method (part 1) of correcting an H-section steel.

FIG. 9 is a view showing a conventionally proposed method of straightening an H-section steel (No. 2).

FIG. 10 is a view showing a method (part 3) for correcting an H-shaped steel that has been conventionally proposed.

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 Co., Ltd. (72) Inventor Atsushi Watanabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-3-285721 (JP, A) JP-A-62-268624 (JP, A) JP-A-57-137028 (JP, A) JP-A-4-59124 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 3/05

Claims (3)

(57) [Claims] 1. An H-shaped steel having a tapered portion on an outer side surface .
A horizontal roller for applying a rolling force to the inner surface of the web and the flange, and a tapered portion having a shape corresponding to the horizontal roller, and the flange of the H-shaped steel is pinched together with the horizontal roller, and the vertical bending of the H-shaped steel is repeated. And a vertical roll for applying a compressive force to the fillet portion from the outer surface of the flange while providing bending. 2. A roller straightening device for an H-section steel, which is provided with horizontal rolls which are arranged alternately up and down along the traveling direction of the H-section steel and press down the web, wherein a taper portion is provided on an outer side surface of the H-section steel. A horizontal roller that applies a rolling force to the inner surface of the flange, and a tapered portion having a shape corresponding to the horizontal roller, and the H-shaped steel flange is pinched together with the horizontal roller to repeatedly bend the vertical bending of the H-shaped steel. A roller straightening device for H-shaped steel, comprising at least one pair of vertical rolls for applying a compressive force to the fillet portion from the outer surface of the flange. 3. The taper angle of the horizontal roller having a tapered portion is reduced toward a downstream stage so that the taper angle of the final horizontal roller is zero and a gap is formed with respect to the web. The roller straightening device for H-section steel according to claim 2, wherein the device is arranged.