JPH04253515A - Method for correcting light h-shape steel - Google Patents

Abstract

PURPOSE:To present the correcting method for light H-shape steel which easily and completely corrects the twist deformation and makes the structure of correcting device simple. CONSTITUTION:On the time when the flange of H-shape steel 2 is pressurized with the outer roll and the two inner rolls arranged on the both side positions by putting the web 7 of the H-shape steel 2 between them at the same positions of its longitudinal direction, the position where one side inner roll 10 comes into contact with the one side of the flange 5 is made to the position shifted by the prescribed distance (a) in the forward or backward direction of the advancing direction of H-shape steel 5 from the position in contact with the outer roll 6. And by shifting the contact position of the inner roll of one side the tensile force is generated on the upper and lower surfaces of the side of flange 5 in contact with this inner roll 10, by which the warpage deforming force opposite to the direction of the twist deformation generated on this flange 5 of H-shape steel is applied.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting torsional deformation that occurs in a lightweight H-section steel during the manufacturing process of the same.

0002

2. Description of the Related Art Conventionally, this type of correction method is generally known to be carried out using the following correction apparatus.

As shown in FIG. 11, this conventional straightening device consists of an upper outer roll 21 that is in contact with the upper end surface of an upper flange 20 and a lower outer roll that is in contact with the lower end surface of a lower flange 22 of an H-shaped steel. 23 and web 24 in H-beam steel
Two inner rolls 25, 26 and H
Two inner rolls 27 and 28 are provided on both sides of the shaped steel with the web 24 in between, and are in contact with the upper end surface of the lower flange 22.

[0004] By rolling down each of the rolls described above, bends, warps, and torsions are corrected. That is, the bending deformation is corrected by operating the lowering force between the inner roll 25 and the inner roll 27. In addition, the inner roll 27 corrects the warp deformation.
This is done by operating the rolling force between the inner roll 28 and the inner roll 28. Furthermore, the correction of twisting deformation is carried out by using diagonally opposing inner rolls 25,
28 and inner rolls 26 and 27 diagonally opposed to each other.

[0005]

[Problems to be Solved by the Invention] However, although the conventional torsion correction method can reduce the amount of torsion deformation, it is not possible to completely correct the torsion deformation.

[0006] Furthermore, when correcting the shape of a section steel that has undergone bending and twisting deformation, the twisting deformation becomes large due to the correction of the bending deformation. Furthermore, correcting twisting deformation may cause bending deformation and warping deformation.

As described above, when two or more shape defects occur, the shape defects will not be resolved unless the torsional deformation is completely corrected. Moreover, by correcting the torsional deformation of the H-section steel, new bending deformation and warping deformation may appear.

As described above, bending and warping deformations in shaped steel are simple shape defects in one direction, but when torsional deformation is included, the shape defects become complicated, making it extremely difficult to improve the shape of the shaped steel. becomes difficult.

[0009]Therefore, there has been a desire for a correction method that can create a state in which torsional deformation is completely corrected and that can then correct bending and warping deformations.

[0010] Conventionally, straightening of shaped steel has been described, for example, in Japanese Patent Publication No. 50-39624 and Japanese Patent Application Laid-open No. 54-123.
As shown in Japanese Patent Publication No. 565, Japanese Patent Application Laid-open No. 57-193232, and Japanese Patent Publication No. 58-37048, it is not possible to completely correct torsional deformation due to the above-mentioned reasons, and the correction device and its roll shape cannot be completely corrected. The trend is to make them complicated and expensive.

[0011] This invention was devised in view of the above-mentioned circumstances, and its purpose is to easily and completely correct twisting deformation, as well as to easily correct bending and warping deformations. Moreover, it is an object of the present invention to provide a method for straightening lightweight H-beam steel, which allows the straightening device to have a simple structure.

0012

[Means for Solving the Problems] A straightening method according to the present invention, that is, the upper and lower flanges of an H-section steel are separately placed at the same position in the longitudinal direction of the flange, and at both sides of the outer roll and the web of the H-section steel. The straightening method is performed by sandwiching and pressing from above and below between two disposed inner rolls. By shifting the position by a predetermined distance in the front-rear direction with respect to the traveling direction of the H-shaped steel, the tensile force applied to the upper and lower surfaces of the flange, which is the side that the inner roll is in contact with, is changed, This is done by applying a warping deformation force to this flange in a direction opposite to the direction of torsional deformation that occurs in the H-shaped steel.

[0013] By applying a warping deformation force to the flange in contact with the inner roll on the one side, a deformation force is actively applied in a direction opposite to the direction of torsional deformation, thereby torsion of the H-beam steel. This eliminates deformation.

[0014]

[Example] Hereinafter, the method for straightening lightweight H-beam steel according to the present invention will be explained.
This will be explained with reference to the illustrated embodiment.

First, a description will be given of the straightening device for carrying out the method of straightening lightweight H-beam steel according to the present invention.
3) is the upper outer roll 4 that is in contact with the upper end surface of the upper flange 3 of the H-section steel 2 at the latter stage of the H-section steel manufacturing process.
and a lower outer roll 6 that is in contact with the lower end surface of the lower flange 5.
and two inner rolls 8 and 9, which are arranged on both sides of the H-beam 2 with the web 7 in between, and which are in contact with the lower end surface of the upper flange 3, and the web 7 of the H-beam 2. Two inner rolls 10 and 11 are provided on both sides of the lower flange 5 and are in contact with the upper end surface of the lower flange 5.

[0016] Also, the inner rolls 8, 9 and the inner rolls 10,
11 is movable by a predetermined distance a in the front and rear directions with respect to the traveling direction of the H-section steel 2.

[0017] Then, with respect to the contact position of the upper outer roll 4 or the lower outer roll 6 with the H-section steel 2 in the longitudinal direction of the H-section steel, either the inner rolls 8, 9 or the inner rolls 10, 11 are It is configured such that torsional deformation of the H-section steel 2 can be corrected by shifting the H-section steel 2 forward and backward in the traveling direction by a distance of +a or -a. Note that warpage and bending deformation may be corrected after torsional deformation is corrected.

In order to correct torsional deformation by the method of the present invention using the straightening device 1 having such a configuration, one of the inner rolls 8, 9 and 10, 11, here. Now inner roll 10, H
+a and -a (here a
= 5 mm, but it is adjusted between 0 and 5 mm) (see Fig. 3).

At this time, by moving the inner roll 10 to the + side, the right-handed twist can be corrected, and by moving the inner roll 10 to the - side, the left-handed twist can be completely corrected without causing the bending or warping deformation to occur again. Can be done.

Next, it will be explained that the right-handed twist can be corrected by moving the inner roll 10 by +a.

Here, moving only the inner roll 10 of the four inner rolls means that the position of the rolling force applied to the lower flange 5 with which the inner roll 9 is in contact, that is, the position of the rolling force from above and the position of the rolling force from below. The lowering force position is shifted by a distance of +a as shown in FIG.

[0022] As a result, since the H-beam 2 always advances while applying a tensile force in the advancing direction (see Fig. 3), the outer surface of the lower flange 5 has less elongation (tensile force) relative to the inner surface. conversely, a compressive force is applied to the inner surface. This is because, although a tensile force is always acting on the upper and lower surfaces of the flange 5, the tensile force is smaller on the inner upper surface than on the outer lower surface.

In other words, only the lower flange 5, which is the side in contact with the inner roll 10, is subjected to a so-called upward warping deformation force in which the upper surface contracts due to compressive force and the lower surface expands due to tensile force. As a result, a force acts on the H-section steel 2 in the direction of correcting the right-handed twisting deformation.

FIGS. 4 and 5 show the results of a comparison between the implementation state of the correction method of the present invention as described above and the implementation state of the conventional correction method.

Here, the amount of bending in the table is the distance L shown in FIG. Further, the amount of warpage is the distance L shown in FIG. Furthermore, the amount of twist is the distance L shown in FIG. This amount of torsion is determined by twisting the H-beam 2 into the skid 12 as shown in FIG.
The measurements were taken with the device installed on top.

[0026] A problem that can be considered when carrying out the correction method of the present invention is flange deformation that occurs when a deforming force for upward warping is applied. However, when assuming the state shown in Fig. 3, the amount x is 100% plastically deformed.
=0.047mm. This is a flange thickness of 2.3
It is a very small amount of 0.047 mm with respect to the distance between both flanges, that is, with respect to the height of the H-beam 2, which is a range that satisfies the tolerance of lightweight H-beams.

[0027] Also, in this embodiment, the inner roll 10 of each inner roll is made movable, but the same effect can be obtained for each inner roll 8, 9, and 11 as well. Furthermore, the inner roll 10 of this invention has H
Although the section steel 2 was moved in parallel in the advancing direction, the same tendency as described above can be obtained even in the turning movement as shown in FIG.

[0028]

Effects of the Invention According to the straightening method of the present invention, the torsional deformation, which could only be reduced to a small size using conventional techniques and could not be completely corrected, can be corrected by moving the inner roll, thereby eliminating other shape defects and dimensional defects. It has become possible to easily and completely correct the condition without complications.

Further, according to the correction method of the present invention, since torsional deformation can be completely corrected, other shape defects caused by bending and warping can also be smoothly corrected.

Furthermore, it is possible to provide a straightening device with a simple structure in which only the inner roll is moved in the advancing direction of the H-section steel, and moreover, it is possible to reliably correct torsional deformation of the H-section steel.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing a correction device that implements the correction method of the present invention.

FIG. 2 is a view taken along line AA in FIG. 1;

FIG. 3 is a schematic view showing the straightening process using the inner roll in the straightening method of the present invention.

FIG. 4 is a comparison table showing the results of the correction method of the present invention and the conventional correction method.

FIG. 5 is a comparison table showing the results of the correction method of the present invention and the conventional correction method.

FIG. 6 is a schematic diagram showing a bending deformation state of an H-section steel.

FIG. 7 is a schematic diagram showing a state of warp deformation of an H-section steel.

FIG. 8 is a schematic diagram showing a state of torsional deformation of an H-section steel.

FIG. 9 is a schematic perspective view showing how the H-shaped steel is installed on the skit.

FIG. 10 is a schematic view showing another aspect of the rolling state of the inner roll in the straightening method of the present invention.

FIG. 11 is a schematic front view showing a correction device that performs a conventional correction method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Straightening device, 2... H-shaped steel, 3... Upper flange, 4... Upper outer roll, 5... Lower flange, 6... Lower outer roll, 7... Web, 8, 9, 10, 11... Inner roll.

Claims (1)

[Claims] [Claim 1] An upper flange and a lower flange of the H-section steel, respectively, are arranged at the same position in the longitudinal direction of the flange, and on both sides of the outer roll and the web of the H-section steel. In a method for straightening a lightweight H-beam steel by sandwiching and pressing it from above and below with an inner roll, the contact position of the one side inner roll that is in contact with the one flange with the flange is the contact position of the outer roll. The position is shifted by a predetermined distance in the front-rear direction with respect to the traveling direction of the H-shaped steel, and by shifting the contact position of the inner roll on the one side in this way, the side on which this inner roll is in contact is A lightweight H-section steel characterized by changing the tensile force applied to the upper and lower surfaces of the flange and applying a warping deformation force to the flange in a direction opposite to the direction of torsional deformation occurring in the H-section steel. How to correct it.