JPH09314235A - Method and device for straightening shape steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the control method, and to realize the excellent accuracy and efficiency in straightening a shape steel by adding the light pressure and tension to a member to be straightened to straighten the shape steel using a light reduction rolling mill and a succeeding roller straightening machine. SOLUTION: In a straightening method, a flange part or a web part of a member 10 to be straightened is lightly reduced by upper and lower horizontal rolls 11, 12 of a light reduction rolling mill 1, and the differential speed between the light reduction rolling mill 1 and a succeeding roller straightening machine 2 is kept constant to straighten a shape steel while tension is given to the member 10 to be straightened. In the straightening method of the shape steel, the light reduction rolling mill 1 is provided with a feedback means for the tension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for straightening a shaped steel manufactured by hot rolling or welding.

[0002]

2. Description of the Related Art Shaped steel as it is manufactured by hot rolling or welding generally bends or warps in whole or locally, and it is normally shipped after straightening cold. Is. As a cold straightening method for shaped steel,
In many cases, it is performed by press straightening or roller straightening, but in the former press straightening method, deformation is appropriately applied by a press fitting while observing the shape before straightening, so it is inefficient and is not suitable for mass production. On the other hand, the latter roller straightening method is a method of straightening a shape steel by repeatedly bending it with a large number of rollers, which is efficient and is installed and used as an online facility in a factory.

However, the deformed or asymmetrical shaped steel as shown in FIG. 8 has a strain inherent in each product and in each of the flange and the web, and it cannot be completely corrected by only repeated bending in one direction. Have difficulty.
As a result, there was no choice but to use correction with an offline press, resulting in a significant reduction in efficiency.

In order to solve the above problems, for example, in JP-A-59-209424 and JP-A-64-78626, a rolling straightening machine is provided on the inlet side or the outlet side of a shaped steel roller straightening machine. A method has been proposed in which a bend that cannot be corrected by a roller straightening machine is straightened by rolling. However, in the straightening by rolling, it is difficult to control the rolling reduction, and if the balance is lost, the appearance shape is deteriorated and twisting occurs. Further, in Japanese Patent Laid-Open No. 64-78626, the bending is measured in advance to control the rolling reduction, but the amount of strain due to the bending is very small, and it is necessary to correct it only by setting the rolling reduction. However, very accurate control is required, and it is practically difficult to correct it.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, an object of the present invention is to make it possible to efficiently and favorably correct a complicated bend of a deformed or asymmetrical shaped steel by a simple method.

[0006]

In order to solve the above-mentioned problems, a method for straightening a shaped steel according to the present invention is to lightly reduce a flange portion or a web portion of a material to be straightened by a light reduction rolling mill, and The material is straightened while applying tension to the material to be straightened by a reduction rolling mill and a roller straightening machine following it. As a method of applying tension to the material to be straightened,
It is carried out by providing a constant speed difference between the roll speed of the light reduction rolling mill and the roll speed of the roller straightening machine. Further, the shaped steel which is the target of the straightening of the present invention is mainly shown in FIG.
As shown in (1), it is a deformed or asymmetrical shaped steel such as unequal side unequal thick angle section steel (A), channel section steel (B), T section steel (C), and unequal side H section steel (D).

Further, the shaped steel straightening apparatus according to the present invention comprises a light reduction rolling mill for lightly reducing the flange portion or the web portion of the material to be straightened, and a roller straightening machine following the light reduction rolling mill. It is characterized in that tension is applied to the material to be straightened by keeping a constant speed difference between the light reduction rolling mill and the roller straightening machine. Further, the light reduction rolling mill has a tension feedback means.

The flange portion or the web portion on the curved side of the material to be straightened is provided with a horizontal or vertical roll of a light reduction rolling mill,
Alternatively, lightly reducing with both rolls, and adjusting the roll speed of this light reduction mill and the roller straightening machine following it to maintain a constant speed difference to straighten the material to be straightened while applying tension to it. While the rolling mill removes residual stress in the flange or web on the side where tension is applied and straightens the bend, the subsequent roller straightening machine repeatedly bends it up and down. It can be corrected with high precision.

Further, in the present invention, it is important that the light rolling mill and the roller straightening machine are continuous in order to have a function of self-rectifying the shape by applying tension, which makes it possible to perform light rolling. The machine can have a tension feedback mechanism. That is, by making the roller straightening machine continuous, when the tension applying side of the flange portion or the web portion tries to greatly expand due to the reduction of the light reduction rolling machine, the elongation in the longitudinal direction becomes large and the tension is not applied, and the rolling load is Feedback control of tension is performed so as to increase and act in the direction of opening the gap.
By applying tension to the material to be straightened in this way, it is possible to control excessive bending of the material to be straightened due to the reduction of the light reduction rolling mill. It has a mechanism.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1A and 1B are configuration diagrams of a correction device according to Embodiment 1 of the present invention, in which FIG. 1A is a side view and FIG. 1B is a plan view. In FIG. 1, 1 is a light reduction rolling mill, and 2 is a succeeding roller straightening machine continuously provided on the downstream side of the light reduction rolling mill 1. 3 is a drive unit for the light reduction rolling mill 1, 4 is a drive unit for the roller straightening machine 2, and these drive units 3 and 4 are provided.
Can control the speed independently. 10 is a shaped steel as a material to be straightened, 11 and 12 are upper and lower horizontal rolls of the light reduction rolling mill 1, 21 and 22 are upper and lower horizontal rolls arranged in a zigzag pattern of the roller straightening device 2, and 30 is a light reduction rolling mill 1. And the tension applied to the material 10 to be straightened by the roller straightening machine 2.

In the straightening apparatus shown in FIG. 1, the light reduction rolling mill 1
With the upper and lower horizontal rolls 11 and 12, the flange portion or the web portion on the bent side of the material to be straightened 10 is lightly pressed,
The roll straightening machine 2 is set to have a higher roll speed than the light reduction rolling mill 1 to maintain a constant speed difference between the roll speeds of the light reduction rolling mill 1 and the roller straightening machine 2 so that the tension 3
The material 10 to be corrected is corrected by applying 0. By thus applying the tension 30 to the material to be straightened 10 to straighten it, the light reduction rolling mill 1 removes the residual stress of the flange portion or the web portion on the tension applying side and corrects the bending by the reduction. Since the machine 2 performs straightening by repeatedly bending up and down, residual strain can be efficiently removed.

Further, the straightening device shown in FIG.
0 is intended for the non-equal unequal thick angle steel in FIG. 8, and the upper and lower horizontal rolls 11 and 12 of the light reduction rolling mill 1 are
Further, as shown in FIG. 2, it is formed in a shape having a roll gap 13 that is bent in a V-shape, and is configured to be movable not only in the vertical direction but also in the axial direction. That is, the upper horizontal roll 11 has a concave conical surface 11c having a shape in which the small diameter portions of the two trapezoidal conical surfaces 11a and 11b are connected, and the lower horizontal roll 12 has the large diameter portions of the two trapezoidal conical surfaces 12a and 12b. It has a convex conical surface 12c having a connected shape, and the above-mentioned "V" -shaped roll gap 13 is formed between the concave conical surface 11c and the convex conical surface 12c. By moving the upper and lower horizontal rolls 11 and 12 in the axial direction and reducing the pressure in the vertical direction, the flange portion or the web portion of the angle steel 10A is reduced. And FIG.
When the upper and lower horizontal rolls 11 and 12 are axially moved in the direction indicated by the arrow in (a), the flange portion 10 of the angle steel 10A is obtained.
When f is rolled down, and when the upper and lower horizontal rolls 11 and 12 are axially moved in the direction indicated by the arrow in FIG. 3B, the web portion 10w of the angle steel 10A is rolled down.

FIG. 4 is a diagram showing a straightening method for unequal-height unequal thick angle steel 10A. The straightening method when the angle side of the angle steel 10A is bent will be described with reference to the flowchart of FIG. FIG. 5 shows a feedback control mechanism for shape correction by reduction and tension.

First, in step S1, the angle steel 10 is used.
During the straightening of A, the light reduction rolling mill 1 and the roller straightening mill 2 are controlled so as to keep the speed difference constant by adjusting the respective roll speeds. When the angle side of the angle steel 10A is bent, the light reduction rolling mill 1 includes the upper and lower horizontal rolls 11 and 1.
By the reduction of 2, the tension 30 effectively acts on the flange side having the shorter length in the longitudinal direction, and the tension distribution tends to extend the flange side having the shorter length (step S2). On the contrary, if the flange side of the shorter length is excessively elongated by the fine rolling of the light reduction rolling mill 1 (step S3), the flange side becomes long and tension is not applied, so that the rolling load increases and the roll gap 13 becomes smaller. The spread does not occur (step S4). Then, the process returns to step S2 again, and the operations after step S2 are repeated. Since the lengths of the flange and the web are made uniform by such a tension feedback mechanism, the bending and warping of the angle steel 10A are corrected (step S5).

As described above, the straightening apparatus of the present invention has a self-correcting function of the shape by the tension feedback mechanism by making the light reduction rolling mill 1 and the roller straightening machine 2 continuous. Moreover, even when the web side of the angle steel 10A is bent, the same operation as above can be performed.

Embodiment 2 6A and 6B are configuration diagrams of a correction device according to a second embodiment of the present invention, in which FIG. 6A is a side view and FIG.
FIG. 3 is a front view of the light reduction rolling mill 1. This example shows a straightening method for a channel steel 10B, and a light reduction rolling mill 1
Is provided with an upper horizontal roll 11 that is inserted into the left and right flange inner surface portions of the channel steel 10B and a stepped lower horizontal roll 12 that restrains the flange and the left and right outer surface portions of the web of the channel steel 10B. When the left flange side is bent, the upper and lower horizontal rolls 11 and 12 are axially moved in the direction of the arrow to slightly reduce the left flange portion. The upper and lower horizontal rolls 21 and 22 of the roller straightening machine 2 are arranged in a staggered manner with the same roll configuration as the upper and lower horizontal rolls 11 and 12 of the light reduction mill 1.

Also in the case of the channel steel 10B, it can be satisfactorily corrected by feedback control of reduction and tension application by the above-mentioned tension feedback mechanism. The T-section steel (C) and the scalene H-section steel (D) in FIG. 8 can also be straightened in accordance with the channel steel 10B.

[0018]

Embodiments of the present invention will be described below. In this example, the straightening machine shown in FIG. 1 was used, and in the conventional method, only the existing roller straightening machine was used to straighten the angle steel. Table 1 shows the dimensions of each portion of the angle steel of the material to be straightened (see FIG. 7). Table 2 shows the specifications of the actual straightening machine. The intermesh of the straightening machine was set so that both methods would have the same effect by themselves. Table 3 shows the effect of the method of the present invention compared with the conventional method.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Table 3]

As can be seen from Table 3, the present invention has a larger shape-correcting effect than the conventional roller-correcting machine alone.

[0023]

As described above, according to the present invention, a light reduction rolling mill and a subsequent roller straightening machine are used to straighten a material to be straightened by applying a light reduction and tension. It is easy and highly accurate correction is possible. Further, since the correction is online, it is possible to carry out the correction with high efficiency.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a correction device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of shapes and mechanisms of upper and lower horizontal rolls of a light reduction rolling mill.

FIG. 3 is an explanatory view showing a flange rolled-down state and a web rolled-down state by the upper and lower horizontal rolls.

FIG. 4 is an explanatory diagram showing a method of straightening angle steel.

FIG. 5 is a flowchart of a tension feedback mechanism.

FIG. 6 is a configuration diagram of a correction device according to a second embodiment of the present invention.

FIG. 7 is a diagram showing dimensions of each part of a material to be straightened which was subjected to a comparative test.

FIG. 8 is a diagram showing an example of a shaped steel targeted by the present invention.

[Explanation of symbols]

 1 Light reduction rolling mill 2 Roller straightening machine 3 Light reduction rolling mill drive device 4 Roller straightening machine drive device 10 Material to be straightened 11, 12 Vertical horizontal roll of light reduction rolling mill 21, 22 Vertical horizontal roll of roller straightening machine

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Fujii 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (3)

[Claims] 1. A light reduction rolling mill lightly reduces the flange or web portion of a material to be straightened, and straightens while applying tension to the material to be straightened by the light reduction rolling mill and a roller straightening machine following it. A method for straightening a shaped steel, characterized by: 2. A light rolling mill for lightly rolling down a flange portion or a web portion of a material to be straightened, and a roller straightening machine subsequent to the light rolling mill. The light rolling mill and the roller straightening machine include: A shaped steel straightening device, which applies tension to a material to be straightened by maintaining a constant speed difference. 3. The shaped steel straightening device according to claim 2, wherein the light reduction rolling mill has the tension feedback means.