JPH0947817A - H-section steel straightening method and straightening device - Google Patents

Abstract

(57) An object of the present invention is to provide an H-section steel straightening device capable of sufficiently correcting the warp of the H-section steel without breaking the fillet portion even if both widthwise end portions of the web are pressed down with a large force. SOLUTION: An H-shaped steel straightening device 30 is a truncated cone-shaped roll 3.
2, the outer peripheral surface 32a and the side surface 32 of the roll 32 are provided.
The boundary portion 34 with b is in contact with the boundary portion (fillet portion) 16 between the flange 12 and the web 14. The outer peripheral surface 32 a is in contact with the surface 14 a of the web 14.
In this way, the two rolls 32 are placed on the web 14 while the predetermined surface of the roll 32 and the predetermined surface of the H-section steel 10 are in contact with each other.
Are arranged at both ends in the width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an H-section steel straightening method and a straightening apparatus for straightening a warp of an H-section steel by rolling down both widthwise end portions of a web.

[0002]

2. Description of the Related Art As a method for straightening the warp of an H-section steel in a cold state, a continuous bending method using a plurality of rolls is generally adopted because of its high straightening efficiency. As this continuous bending method, as shown in FIG. 3 (a), a method of simultaneously rolling down the flange 12 and the web 14 of the H-section steel 10 using rolls 22 and 24, and FIG. 3 (b). As described above, a method of rolling the web 14 of the H-section steel 10 using the roll 24 is known. In the method shown in FIG. 3A, the equipment cost is high and the roll 22 must be replaced every time the flange width is changed. Therefore, the method shown in FIG. 3B is the mainstream.

A case where the warp of the H-section steel is corrected by the method shown in FIG. 3B will be described. Web 14
Since it is rolled down by the roll 24, it tends to deform depending on the rolling down amount. On the other hand, the portion of the flange 12 in the vicinity of the roll 24 tends to deform in the inclining direction in response to the deformation of the web 14, but the portion of the flange 12 distant from the roll 24 in the longitudinal direction of the H-section steel is made of the web 14. This distant part is not deformed because it is not affected by deformation. Therefore,
The part of the flange 12 near the roll 24 is constrained by the distant part of the flange 12, and the deformation of the part near the roll 24 in the direction of falling toward the inside of the flange 12 is suppressed. As a result, only the web 14 is deformed and the web 14 is deformed.
A large stress may be generated in the boundary portion (fillet portion 16) between the flange 12 and the flange 12, and the fillet portion may be broken.

As one of the methods for preventing the fillet portion 16 from breaking, as shown in FIG. 4, the gap L between the inner surface 12a of the flange 12 and the outer surface 24a of the roll 24 is set to several mm. Inner surface 12a of 12 and roll 24
There is known a method of forming a gap between the outer surface 24a and the outer surface 24a. Without this gap, as shown in FIG.
When the roll is rolled by the roll 24, the flange 12 that should be deformed as shown by the broken line 12 ′ is restrained at the position of the flange 12 shown by the solid line. When the flange 12 is constrained in this manner, stress is further generated in the fillet portion 16 where large stress is generated as described above, and the possibility that the fillet portion 16 is broken becomes extremely high.

On the other hand, however, if the distance L is increased, the bending moment in the fillet portion 16 is increased, and a large bending stress is generated in the fillet portion 16. Therefore, it is not necessary to increase the interval L. Therefore, the setting of the interval L becomes very delicate, and in actual operation, in order to prevent the breakage of the fillet portion 16, both ends of the web 14 in the width direction are pressed down with a relatively small force. Therefore, the warp of the H-section steel is not sufficiently corrected, it is difficult to make the shape of the H-section steel into a target shape, and the rate of requiring manual re-correction of the press is high.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method of pressing down both widthwise ends of a web with a large force.
An object of the present invention is to provide an H-section steel straightening method and a straightening apparatus capable of sufficiently correcting the warp of the H-section steel without breaking the fillet portion.

[0007]

The H-section steel straightening method of the present invention for achieving the above-mentioned object is an H-section steel by pressing both end portions in the width direction of the web from one surface of both surfaces of the web. In the H-section steel straightening method for straightening the warp of steel,
(1) Prepare a truncated cone-shaped roll (2) so that the boundary portion between the outer peripheral surface and the side surface of this roll contacts the fillet portion of the H-shaped steel and the outer peripheral surface contacts one of the surfaces. It is characterized in that the roll is arranged at both ends in the width direction of the one surface, and (3) the both ends in the width direction are pressed down by the roll to correct the warp of the H-section steel.

The H-section steel straightening apparatus of the present invention for achieving the above object is provided with a plurality of split type rolls for respectively pressing down both widthwise end portions of one side of both sides of the web. In the H-shaped steel straightening device for straightening the warp of the H-shaped steel by rolling down the both ends in the width direction using a roll, the roll has a boundary portion between the outer peripheral surface and the side surface of the H-shaped steel fillet portion. It is characterized in that it is in the shape of a truncated cone in which the outer peripheral surface is in contact with and is in contact with the one surface.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing an H-section steel straightening device of the present invention, and FIG. 2 is an enlarged view showing a contact portion between a roll and the H-section steel. The H-section steel straightening device 30 is a truncated cone-shaped roll 3
2, the outer peripheral surface 32a and the side surface 32 of the roll 32 are provided.
The boundary portion 34 with b is in contact with the boundary portion (fillet portion) 16 between the flange 12 and the web 14. The outer peripheral surface 32 a is in contact with the surface 14 a of the web 14.
In this way, when the predetermined surface of the roll 32 and the predetermined surface of the H-section steel 10 are in contact with each other, the two rolls 32 are in contact with each other.
Are arranged at both ends in the width direction. Side 3 of roll 32
The angle θ formed by 2b and the inner surface 12a of the flange 12 is 5
It is within the range of 10 °. If the angle θ is less than 5 °, the deformation of the flange 12 may be restrained when the web 14 is largely pressed, and even if the angle θ exceeds 10 °, it is not useful for canceling the deformation constraint of the flange 12. On the contrary, on the contrary, the product surface flaw is caused by the slip between the web 14 and the outer peripheral surface 32a of the roll.

The H-section steel straightening device 30 includes a roll 32,
An adjusting machine 34 that can adjust the distance between the two rolls 32 is provided. By adjusting the adjuster 34, it is possible to handle H-section steels having different widths of the web 14 in the width direction. Further, the H-section steel straightening device 30 also includes an elevator 36 that uses a hydraulic cylinder to move the roller 32 up and down.
The elevator 36 allows the H of different thicknesses of the web 14 to be produced.
It can also be used for shaped steel. The roll 32 is rotatably connected to a shaft 40 via a roller bearing 38. Incidentally, among the members of the H-section steel straightening device, the members other than the above-mentioned members are the same as those conventionally used, and therefore the description thereof will be omitted here.

In straightening the H-section steel by using the H-section steel straightening device 30, the outer peripheral surface 32a of the roll 32 and the side surface 3 are formed.
The rolls 32 are arranged at both ends in the width direction of the web 14 so that the boundary portion 34 with 2b contacts the flange 12 and the fillet portion 16 of the web 14 and the outer peripheral surface 32a contacts the surface 14a of the web 14. Both ends in the width direction are rolled down by a roll 32. Roll 3 arranged in this way
When both widthwise ends of the web 14 are pressed down by 2, the flange 12 is bent toward the side where the roll 32 is arranged according to the deformation of the web 14. The space 40 is formed because the inner surface 12a of the flange 12 and the side surface 32b of the roll 32 are separated from the fillet portion 16 toward the widthwise end of the flange 12, and the bent portion of the flange 12 is the space 40. Will be accepted by. Therefore, since the deformation of the flange 12 is not restrained by the roll 32, the stress generated in the fillet portion 16 can be reduced, and the breakage of the fillet portion 16 can be prevented. Further, since the roll 32 is arranged so that the fillet portion 16 and the boundary portion 34 are in contact with each other, the bending moment in the fillet portion 16 is reduced and the bending stress generated in the fillet portion 16 is reduced. Breakage can be prevented. As a result, both ends of the web 14 in the width direction can be pressed down with a large force, and the warp of the H-section steel 10 can be sufficiently corrected without breaking the fillet portion 16.

Table 1 shows a comparison of press re-correction rates by the correction method of the present invention and the conventional correction method (method shown in FIG. 4). An H-section steel straightening device using rollers may not be able to completely straighten the H-section steel, and in such a case, a manual press re-straightening is performed using an offline press machine. As shown in Table 1, the H-section steel straightening method of the present invention has a press re-straightening rate of 6%, whereas the conventional H-section steel straightening method has a press re-straightening rate of 15%. Proved to be excellent.

[0013]

[Table 1] ────────────────────────── Press re-correction rate Present invention 6% Conventional method 15% ───────── ────────────────── In addition, both ends of the width direction of the web 14 are pressed down 2
It is preferable that the distance between the two rolls 32 can be adjusted so as to accommodate various web widths.

[0014]

As described above, according to the H-shaped steel straightening method of the present invention, the boundary portion between the outer peripheral surface and the side surface of the truncated cone-shaped roll is the boundary portion (fillet portion) between the flange and the web.
And the outer peripheral surface of the roll is in contact with the surface of the web. Therefore, from the fillet portion in contact with each other toward the widthwise end portion of the flange,
The inner surface of the flange is separated from the side surface of the roll.
Therefore, the flange can be bent toward the roll, the deformation of the flange is not restrained, the stress generated in the fillet portion can be reduced, and the breakage of the fillet portion can be prevented. Further, since the boundary portion between the outer peripheral surface and the side surface of the roll is in contact with the fillet portion, it is possible to reduce the bending moment in the fillet portion, reduce the bending stress generated in the fillet portion, and prevent the fillet portion from breaking. As a result, both widthwise ends of the web can be pressed down with a large force, and the warp of the H-section steel can be sufficiently corrected without breaking the fillet portion.

According to the H-section steel straightening device of the present invention,
The frusto-conical roll is placed at both ends in the width direction of the web so that the boundary portion between the outer peripheral surface and the side surface of the frusto-conical roll contacts the fillet portion of the H-shaped steel and the outer peripheral surface of the roll contacts the web surface. Therefore, the inner surface of the flange and the side surface of the roll are separated from each other in the width direction end of the flange from the fillet portion in contact with each other. Therefore, the deformation of the flange is not restricted, the flange can be bent toward the roll, the stress generated in the fillet portion can be reduced, and the breakage of the fillet portion can be prevented. Further, since the boundary portion between the outer peripheral surface and the side surface of the roll is in contact with the fillet portion, it is possible to reduce the bending moment in the fillet portion, reduce the bending stress generated in the fillet portion, and prevent the fillet portion from breaking.

As a result, the widthwise ends of the web can be pressed down with a large force, and the warp of the H-section steel can be sufficiently corrected without breaking the fillet.

[Brief description of drawings]

FIG. 1 is a schematic view showing an H-section steel straightening device of the present invention.

FIG. 2 is an enlarged view showing a contact portion between a roll and an H-shaped steel.

FIG. 3 shows a conventional H-section steel straightening method, (a) is a schematic view showing a method of simultaneously pressing a flange and a web, and a schematic view showing a method of pressing a web.

FIG. 4 is a schematic view showing a state in which the roll of the conventional H-section steel straightening device is arranged at the widthwise end of the web.

FIG. 5 is a schematic view showing the deformation of the flange when the web is pressed down by the conventional H-section steel straightening device.

[Explanation of symbols]

 12 flange 14 web 16 fillet part 30 H-shaped steel straightening device 32 frustoconical roll 32a roll outer peripheral surface 32b roll side surface 34 boundary part

Claims (2)

[Claims] 1. A H-shaped steel straightening method for straightening the warp of an H-shaped steel by pressing down both widthwise end portions of the web from one of both surfaces of the web, wherein a truncated cone-shaped roll is prepared. The roll in such a manner that the boundary portion between the outer peripheral surface and the side surface contacts the fillet portion of the H-shaped steel and the outer peripheral surface contacts the one surface. And rectifying the warp of the H-section steel by rolling down both ends in the width direction with the rolls. 2. A plurality of split rolls for respectively pressing down both widthwise end portions of one surface of both sides of the web,
In an H-section steel straightening device for straightening the warp of an H-section steel by rolling down both ends in the width direction using the roll, the roll comprises a fillet of H-section steel at a boundary between an outer peripheral surface and a side surface of the roll. An H-shaped steel straightening device, wherein the H-shaped steel straightening device is in the shape of a truncated cone that comes into contact with a portion and the outer peripheral surface comes into contact with the one surface.