JP2797938B2 - Method and apparatus for straightening 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 H-shaped steel which is straightened by simultaneously pressing a web and a flange.
The present invention relates to a method and an apparatus for correcting a shape steel.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a part of a contact state between a straightening roller and an H-section steel in a conventional roller straightening method. (A) of each figure is a side view,
(B) is a front view. In the figure, 20 is an H-section steel 10
Correction rollers arranged alternately in the upper and lower directions in the traveling direction. As can be seen from these figures, the conventional load straightening method of the roller straightener includes a web rolling method in which the web surface of the H-section steel 10 is loaded by the outer peripheral surface of the roller 20 as shown in FIG. The flange end surface of the H-section steel 10 is loaded by the outer peripheral surface of the roller 20 in the flange rolling down method 2
There are types.

[0003] The web rolling method has a drawback in that the contact portion between the web (near the fillet portion) and the roller undergoes plastic deformation, and the web height fluctuates. In order to solve this drawback, Japanese Patent Application Laid-Open No. 64-71524, "H-shaped steel straightening apparatus" and Japanese Patent Application Laid-Open No. 3-90215, "H-shaped steel straightening method and apparatus", use a roller height variation by a roller. An attempt is made to solve the problem by installing a fluctuation preventing roll at the subsequent stage of the straightening machine, but there is a problem that the effect is limited only to the prevention of the fluctuation of the web height. Also, a method of restraining both side surfaces of the flange simultaneously with the web reduction (for example, Japanese Patent Application Laid-Open No.
The straightening method for shaped steel and similar shaped steels ”) has a problem that the effect is limited to camber (horizontal) bending straightening only.

On the other hand, in the flange rolling down method, deterioration of mechanical properties in the vicinity of a fillet portion can be prevented by rolling down the flange end surface (upper and lower flange surfaces). For example, Japanese Patent Publication No. 57-48287, "H-shaped steel straightening roll". However, this proposal has a risk of so-called collapse of the toes due to fluctuations in the flange width. Japanese Patent Publication No. 56-45684, "H-Shaped Steel Roller Straightening Method" relates to a flange straightening method, which is intended to correct a vertical or horizontal (camber) bend. Because the peripheral speeds of the parts are different, deformation is induced in the direction in which the flange falls down, and when the load on the part that starts to contact the flange and the part that comes off from the contact with the flange increases, the shape of the material before straightening and the material being straightened There is a problem with the biteability considered.

Japanese Patent Publication No. 57-11728 "Roller straightening machine" adopting simultaneous rolling method of flange and web, and Japanese Patent Publication No. 55-3
No. 2450 "Method and apparatus for straightening H-section steel" is equipped with a roller for lowering the flange tip (with a lowering adjustment mechanism) coaxially with the roller for lowering the web. (Including prevention of damage to the fillet portion), but there is a problem that the effect is small for lateral (camber) bending and twisting.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to prevent damage near a fillet portion (including deterioration of mechanical properties). The present invention provides a method and an apparatus for correcting an H-section steel capable of simultaneously performing a correction of a horizontal (camber) bend and a correction of a torsion.

[0007]

A method for straightening an H-section steel according to the present invention is a method for straightening an H-section steel with a roller, wherein the vicinity of a fillet portion of a web of the H-section steel is alternately arranged vertically in the traveling direction of the H-section steel. At the same time as pressing with the arranged upper roll and lower roll, the upper inclined roll and the lower inclined roll having respective roll axes in a plane perpendicular to the traveling direction of the H-section steel on the same plane as the axis of the upper roll or the lower roll. The upper and lower surfaces and the outer surface of the flange of the H-section steel are pressed by the inclined rolls.

Further, the upper roll and the upper inclined roll, and the lower roll and the lower inclined roll can be tilted within respective roll axis planes, so that the H-shaped steel can be further corrected for torsion. is there.

An apparatus for carrying out the straightening method comprises an upper roll and a lower roll which are arranged alternately up and down in the traveling direction of the H-section steel and press the vicinity of a fillet portion of the web of the H-section steel; An upper inclined roll and a lower inclined roll having respective roll axes in a plane perpendicular to the traveling direction of the H-section steel on the same plane as the axis of the H-section steel and pressing the upper and lower surfaces and the outer side surface of the H-section steel flange; It is characterized by having.

[0010]

The upper roll and the lower roll press the vicinity of the fillet portion of the H-section steel web, and at the same time, each of the rolls is placed on a plane flush with the axis of the upper roll or the lower roll and perpendicular to the traveling direction of the H-section steel. The upper and lower surfaces and the outer surface of the flange of the H-section steel are pressed by the upper inclined roll and the lower inclined roll having the axis. Further, the H-shaped steel is torsionally corrected by changing the inclination direction and the inclination angle of the upper roll and the upper inclined roll and the lower roll and the lower inclined roll in the respective roll axis planes.

[0011] Since the flanges are restrained by the upper and lower inclined rolls, the effect of preventing damage to the vicinity of the fillet portion (including the prevention of deterioration of mechanical properties) and the effect of correcting the vertical bending are increased by the web reduction of the upper and lower rolls. Further, by restraining the upper and lower surfaces of the flange and the outer surface of the flange with the vertically inclined rolls, the effect of preventing the fluctuation of the web height, the prevention of the flange from falling and the correction of the lateral (camber) bend is increased. Further, in the conventional flange rolling down method, there is a danger of flange toe collapse, but in the present invention, the load can be shared by simultaneously rolling down the web and the flange, which can be avoided. Further, by making the upper and lower rolls and the upper and lower inclined rolls tiltable within the roll axis plane, twist correction is possible.

[0012]

FIG. 1 is a front view of an apparatus for straightening an H-section steel according to an embodiment of the present invention, and FIG. 2 is a side view. This straightening device is
An upper roll 1 and a lower roll 2 having a shape in contact with the vicinity of the fillet portion of the web 11 of the H-section steel H
The upper inclined roll 3 which is arranged alternately in the vertical direction with respect to the traveling direction of the section steel 10 and has a shape in contact with the upper surface and the outer side of the flange 12 of the H section steel 10, and the lower surface of the flange 12 of the H section steel 10 The lower inclined roll 4 having a shape contacting the side surface is formed such that the roll axis 5 of each of the inclined rolls 3 and 4 is the same plane as the axis 6 of the upper roll 1 or the lower roll 2 and the traveling direction a of the H-section steel 10 It is arranged so as to be in a plane perpendicular to. Reference numerals 3a and 3b denote a roll portion for pressing the flange upper surface and a roll portion for pressing the outer surface of the flange of the upper inclined roll 3, and 4a and 4b denote a roll portion for pressing the lower surface of the flange and a roll portion for pressing the outer surface of the flange of the lower inclined roll 4, respectively. It is. The inclination angle θ of each of the inclined rolls 3 and 4 is generally 45 °, but depends on the angle between the upper or lower surface of the flange and the outer surface of the flange. Also, upper roll 1
And the upper inclined roll 3 and the lower roll 2 and the lower inclined roll 4,
A plane (axis center plane) 7 including the respective axes 6 and 5 identically.
It is configured to be tiltable inside. Although this tilting means is not shown, for example, it is possible to tilt the stand frame by the right and left lifting devices. The inclined rolls 3 and 4 may be arranged on the entire upper roll 1 and lower roll 2 or on a part thereof.

In the present embodiment, the upper roll 1 and the lower roll 2 configured as described above press the fillet portion of the H-section steel 10 near the fillet portion, and at the same time, the upper inclined roll 3 and the lower inclined roll 4
The H-shaped steel 10 is straightened while pressing the upper and lower surfaces and the outer side surface of the flange 12 of the H-shaped steel 10.

FIG. 3 is a view showing a straightened state of the H-shaped steel 10 in a vertical direction. As shown in FIG.
The vertical bending of the H-section steel 10 can be corrected by simultaneously applying bending moments from above and below to the web 11 and the flange 12 by the upper and lower rolls 1 and 2 and the upper and lower inclined rolls 3 and 4, respectively. Further, since the flange 12 is restrained by the vertically inclined rolls 3 and 4, the web height does not fluctuate and the flange does not fall even when the vicinity of the fillet is reduced by the upper and lower rolls 1 and 4. Damage (including deterioration of mechanical properties) can be prevented.

Next, FIG. 4 is a view showing a state in which the horizontal (camber) bending of the H-section steel 10 is corrected. As shown in FIG. 4, a horizontal bending moment is repeatedly applied to the H-section steel 10 by the vertically inclined rolls 3 and 4. Thereby, the lateral (camber) bending of the H-section steel 10 can be corrected.

FIG. 5 is a view showing a state in which the torsion of the H-section steel 10 is corrected, and FIG. 6 is a front view showing a part of the H-shaped steel 10 taken out. That is, the upper and lower rolls 1 and 2 and the upper and lower inclined rolls 3 and 4 are alternately inclined in the plane 7 including the roll axes 6 and 5 in the inclination direction and the inclination angle α, β (α and β are the entrance portions of the straightening device. It is not always necessary to make them equal, but they are both set to 0 at the exit.)
Twisting moments in opposite directions are alternately applied to the H-beam 10 to correct the torsion.

[0017]

As described above, according to the present invention, the vicinity of the fillet portion of the web of the H-section steel is pressed by the upper roll and the lower roll, and at the same time, the H-section steel is coplanar with the axis of the upper roll or the lower roll. The upper and lower surfaces and the outer surface of the flange of the H-section steel are pressed by the upper inclined roll and the lower inclined roll each having a roll axis in a plane perpendicular to the traveling direction, so that the quality and shape are excellent. This has the effect that an H-shaped steel can be obtained.

In addition, by making the upper roll and the upper inclined roll and the lower roll and the lower inclined roll tiltable in the respective roll axis planes, damage near the fillet portion (including deterioration of mechanical properties) is prevented. , Web height fluctuation prevention,
In addition to preventing the flange from falling down, increasing the effect of correcting the vertical bending, and increasing the effect of correcting the lateral (camber) bending, the twist can be corrected, so that there is a remarkable effect in improving the straightness rate of the H-section steel.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a side view of the present embodiment.

FIG. 3 is a view showing a straightened state of the H-shaped steel in the vertical bending.

FIG. 4 is a view showing a state in which horizontal (camber) bending of an H-section steel is corrected.

FIG. 5 is a diagram showing a state in which H-shaped steel torsion is corrected.

FIG. 6 is a front view showing a part of FIG.

FIG. 7 is a view showing a conventional web straightening type roller straightening method.

FIG. 8 is a view showing a conventional roller reduction method using a flange pressure reduction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper roll 2 Lower roll 3 Upper inclined roll 4 Lower inclined roll 5 Axis of vertical inclined roll 6 Axis of vertical roll 7 Axis plane 10 H section

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuji Matsuoka 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Shinichi Nagahashi 1-1-2, Marunouchi, Chiyoda-ku, Tokyo Japan (56) References JP-A-53-14654 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 3/05 B21D 3/02

Claims (3)

(57) [Claims] 1. A method for straightening an H-section steel with a roller, wherein the vicinity of a fillet portion of a web of the H-section steel is pressed by upper rolls and lower rolls arranged alternately up and down in the traveling direction of the H-section steel. Upper and lower surfaces and outer surfaces of a flange of the H-shaped steel with an upper inclined roll and a lower inclined roll having respective roll axes in a plane perpendicular to an axis of the roll or the lower roll and perpendicular to a traveling direction of the H-shaped steel. Pressurizing the H-shaped steel. 2. The method according to claim 1, wherein the upper roll and the upper inclined roll, and the lower roll and the lower inclined roll are tiltable in respective roll axis planes, so that the torsion correction of the H-section steel is further enabled. The straightening method for an H-section steel according to claim 1, wherein 3. An upper roll and a lower roll which are arranged alternately in the vertical direction in the traveling direction of the H-section steel and press the vicinity of the fillet portion of the web of the H-section steel, and on the same plane as the axis of the upper roll or the lower roll. Each roll axis in a plane perpendicular to the direction of travel of the H-section steel,
An H-beam straightening device having an upper inclined roll and a lower inclined roll for pressing the upper and lower surfaces and the outer surface of an H-shaped steel flange.