JP2021035687A - Curve correcting method and correcting device - Google Patents

Abstract

To provide a curve correcting method with which further excellent curve correcting capability can be acquired, and to provide a correcting device.SOLUTION: A curve correcting method for correcting a curve in a shaped steel having a web and a flange includes a step of rolling an inner flange that is a flange inside a curve and a fillet that is a boundary between the inner flange and a web.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bending straightening method and a straightening device for removing and straightening a bend of a shaped steel having a web and a flange.

Shaped steels having webs and flanges, typified by H-shaped steels, are manufactured by welding and assembling steel plates and hot rolling steel materials. In such H-beams, due to non-uniform heating, cooling, and plastic deformation in the manufacturing process, bending or warping occurs in all or part of the product in the longitudinal direction, and a straight product can be obtained. It may not be. In addition, a defective shape product having a twist in which bending and warping are combined may occur. In order to remove such bending and warping to obtain a straight product, in the production of H-section steel, cold straightening is generally performed before the product is shipped.

In the following description, bending and warping are defined as shape defects below. Bending and warping will be described by taking H-section steel 1 as an example with reference to FIGS. 7 and 8. The H-beam 1 is connected to both ends of the web 10 extending in one direction and the extending direction of the web 10 (hereinafter, also referred to as “horizontal direction” or “height direction”) in a cross-sectional shape orthogonal to the longitudinal direction. The steel has a pair of flanges 11 extending in the vertical direction (hereinafter, also referred to as “width direction”) orthogonal to the horizontal direction. In such an H-shaped steel 1, a posture in which the extending direction of the web 10 is the horizontal direction and the width direction of the flange 11 is the vertical direction is called the H posture. In this H posture, the bending is the bending in the left-right direction (web height direction) as shown in FIG. 7 (A), and the warping is the vertical direction (web thickness) as shown in FIG. 8 (A). It is a curve in the vertical direction.

As a method for straightening a shaped steel, a method of bending the shaped steel using a press and a roller straightening method of pressing down a web using a plurality of rollers arranged in a staggered pattern on the upper and lower sides are common. Further, Patent Document 1 discloses a method of efficiently correcting the bending of a shaped steel by rolling and stretching a flange. In the straightening method of Patent Document 1, an outer surface roll that presses the flange from the outer surface and two inner surface rolls that press the flange from the inner surface and are provided so as to sandwich the web are used, and a predetermined rolling force is applied by these rolls. And roll the flange. By rolling in this way, the straightening method of Patent Document 1 can straighten the bend more efficiently than the press straightening or the roller straightening.

Japanese Unexamined Patent Publication No. 2014-1480898

For example, in the case of the conventional straightening method in which the bending of a shaped steel having a web and a flange is corrected as in Patent Document 1, only the flat portion of the flange is rolled to correct the bending. However, in such a conventional method, when correcting a bend having a large amount of bending, the amount of reduction becomes too large, so that the bending may not be sufficiently corrected.
Therefore, the present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to provide a bending straightening method and a bending straightening device capable of obtaining a higher bending straightening ability.

As a result of repeated studies, the present inventors have obtained a higher bending straightening ability with the same rolling force by rolling not only the flat portion of the flange but also the fillet near the web when straightening the shaped steel. I understood. The present invention is based on the above findings.
According to one aspect of the present invention, a bending straightening method for straightening a bend of a shaped steel having a web and a flange, the inner flange which is the inner flange of the bend, and the boundary between the inner flange and the web. A method of straightening a bend is provided in which a part, a fillet, is rolled.

According to one aspect of the present invention, it is a bending straightening device for straightening a bending of a shaped steel having a web and a flange, and is an outer surface of an inner flange which is an inner flange of the bending and is an opposite surface of the web. A pair of outer rolls in which the peripheral surface of the roll contacts the flange, the inner surface of the flange which is the surface of the inner flange on the web side, and the fillet which is the boundary between the inner flange and the web. The inner surface roll is provided, and the inner flange and the fillet are rolled by the outer surface roll and the pair of inner surface rolls, and the pair of inner surface rolls are arranged with the web sandwiched between them, and the web side is provided. Provided is a bending straightening device in which each of the web-side corners, which is the end face corner portion of the flange, has a rounded shape, and the web-side corner is in contact with the fillet.

According to one aspect of the present invention, there is provided a bending straightening method and a bending straightening device that can obtain a higher bending straightening ability.

It is a front view which shows the correction apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the cross-sectional shape of H-shaped steel. It is a front view which shows the inner surface roll. It is sectional drawing which shows the cross-sectional shape of T-shaped steel. It is a front view which shows the method of straightening the bending of a T-shaped steel. It is a front view which shows the modification of the bending correction device. It is a schematic diagram which shows the bending of the H-shaped steel, (A) shows the plan view of the H-shaped steel, and (B) shows the cross-sectional view of the H-shaped steel. It is a schematic view which shows the warp of the H-shaped steel, (A) shows the side view of the H-shaped steel, and (B) shows the sectional view of the H-shaped steel. It is a front view which shows the conventional straightening apparatus used for straightening a bend in a comparative example.

The following detailed description illustrates many specific details by exemplifying embodiments of the invention to provide a complete understanding of the invention. However, it is clear that one or more embodiments can be implemented without such particular detail description. Also, for the sake of brevity, the drawings are schematic representations of well-known structures and devices.

<Bending correction device>
The bending straightening device 2 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the straightening device 2 includes an outer surface roll 20 and a pair of inner surface rolls 21 and 22. The straightening device 2 corrects the bending of the H-shaped steel 1, which is one of the shaped steels having a web and a flange, and is provided, for example, in a rolling line having a plurality of rolling mills.

As shown in FIG. 2, the H-section steel 1 has a web 10 and a pair of flanges 11 in a cross-sectional shape orthogonal to the longitudinal direction. The web 10 and the pair of flanges 11 are as described above. Further, with respect to the bent H-shaped steel 1, of the pair of flanges 11, the flange 11 on the inner side of the bend is also referred to as the inner flange 11a. Further, regarding the left-right end faces of the pair of flanges 11, the surfaces on the web 10 side are referred to as flange inner surfaces, and the surfaces on the opposite sides of the web 10 are referred to as flange outer surfaces. Further, in the H-section steel 1, the boundary portion where the web 10 is connected to the flange 11 is called a fillet 12. That is, the H-section steel 1 has a pair of fillets 12 at the boundary between both end sides of the web 10 and the pair of flanges 11. The pair of fillets 12 are formed so that the web 10 and the flange 11 are gently connected in the cross-sectional view shown in FIG. 2, and specifically, the angle at which the web 10 and the flange 11 are connected is arcuate. Is formed in. In this embodiment, the arcuate radius of the flange 11 is R _b . Further, in the H-beam 1 in the H posture, the length of the flange 11 in the vertical direction is referred to as the flange width B, and the length of the web 10 in the left-right direction is referred to as the web height H.

The outer surface roll 20 is a roll extending in the vertical direction (vertical direction in FIG. 1), and is rotatably provided about a central axis parallel to the vertical direction. The outer surface roll 20 is arranged so that the roll peripheral surface faces the flange outer surface of the inner flange 11a, which is one of the flanges 11, and the roll peripheral surface comes into contact with the flange outer surface. The length of the outer surface roll 20 in the longitudinal direction (length in the vertical direction) is preferably longer than the flange width B. Further, as shown in FIG. 1, the outer surface roll 20 is preferably arranged so that the peripheral surface of the roll is in contact with the entire length of the inner flange 11a in the extension direction.

The pair of inner surface rolls 21 and 22 are rolls extending in the vertical direction and are rotatably provided about a central axis parallel to the vertical direction. The pair of inner surface rolls 21 and 22 are arranged side by side in the vertical direction with the peripheral surface of the roll facing the inner surface of the flange of the inner flange 11a and sandwiching the web 10. It is preferable that the length of the pair of inner surface rolls 21 and 22 in the longitudinal direction (length in the vertical direction) is longer than the length of the flange 11 on the upper and lower surfaces side of the web 10.
Further, the outer surface roll 20 and the pair of inner surface rolls 21 and 22 are configured to be movable in the left-right direction, and the H-shaped steel 1 arranged between them during straightening can be pressed with a predetermined load (rolling load). To.

Further, the pair of inner surface rolls 21 and 22 have web side corner portions 211 and 221 and flat portions 212 and 222, respectively.
The web side corners 211 and 221 are end face corners on the web 10 side of both end faces in the longitudinal direction of the inner rolls 21 and 22. The web-side corners 211 and 221 come into contact with the upper and lower surfaces of the fillet 12 at the time of correction described later. Further, the web side corners 211 and 221 each have a rounded shape according to the shape of the fillet 12. That is, the pair of inner surface rolls 21 and 22 have a shape in which the corners of the ends on the web 10 side are cut out in an arc shape according to the shape of the fillet 12 in a cross-sectional view passing through the central axes of the inner surface rolls 21 and 22. Each has. Incidentally, the radius _{R a} (arcuate radius) of the web-side corners 211 and 221, the following radius _{R b} of straightening the previous fillet 12 (arcuate radius) of the fillet 12 products radius _{R b} (arcuate It is desirable that it is equal to or greater than the lower limit of (radius). Note that the lower limit of the radius R _b of the fillet 12 the product, which is the lower limit of the radius R _b of the fillet 12 which is acceptable as a product.
The flat portions 212 and 222 are portions of the roll peripheral surface excluding the portions where the web side corner portions 211 and 221 are formed, and are portions that come into contact with the inner surface of the flange of one of the flanges 11 during correction described later. The flat portions 212 and 222 have a constant cylindrical radius (length from the central axis to the outer peripheral surface) regardless of the location in the vertical direction.

<Bending correction method>
Next, a method for correcting bending according to the present embodiment will be described. In the present embodiment, the bending of the H-section steel 1 rolled by a plurality of rolling mills is corrected by the straightening device 2. In the correction of bending, first, of the pair of flanges 11, the inner flange 11a, which is the flange 11 inside the bending, is H-shaped so as to be located between the outer surface roll 20 and the pair of inner surface rolls 21 and 22. The steel 1 is arranged in the H posture. Then, the H-shaped steel 1 is conveyed to the straightening device 2, and is reduced (rolled) by pressing the inner flange 11a with the outer surface roll 20 and the pair of inner surface rolls 21 and 22. At this time, the roll peripheral surface of the outer surface roll 20 comes into contact with the flange outer surface of the flange 11, and the flat portions 212 and 222 of the pair of inner surface rolls 21 and 22 are flat portions of the flange inner surface of the flange 11 (parts excluding the fillet). It comes into contact with the flat portion. Then, the outer surface roll 20 and the pair of inner surface rolls 21 and 22 convey the H-shaped steel 1 so that the flange 11 passes through the roll gap while pressing the flange 11 with a predetermined rolling load. Is rolled. Further, when the flange 11 is reduced, the web-side corners 211 and 221 of the pair of inner surface rolls 21 and 22 are in contact with the fillet 12. Therefore, at the same time as the flange 11, the fillet 12 on the inner side of the bend is also pressed and pressed by the outer surface roll 20 and the web-side corners 211 and 221 of the pair of inner surface rolls 21 and 22.

The effect of pressing the fillet 12 in addition to the flange 11 will be described. Generally, in a shaped steel having a flange and a web manufactured by hot rolling, the flange thickness t _f (for example, in the case of H-shaped steel 1, t _f shown in FIG. 2), which is the thickness of the flange, is the thickness of the web. Since it is thicker than a certain web thickness t _w (for example, in the case of H-section steel 1, t _f shown in FIG. 2), the temperature of the flange at the end of hot rolling is higher than the temperature of the web. Therefore, in the product cooled to room temperature, a residual stress in the length direction of compression is generated on the web and a residual stress in the length direction of tension is generated on the flange. Since the fillet where the web and the flange intersect is thicker than the flange, the temperature at the end of hot rolling is the highest in the cross section. Therefore, the largest tensile residual stress is generated in the fillet in the cross section of the product cooled to room temperature.

With residual stress in the length direction, the tensile part has the property of being easily stretched by rolling. Therefore, if the rolling force is the same, the larger the tensile residual stress is reduced, the larger the stretching can be obtained. In the bending straightening method in which the flange 11 of the H-shaped steel 1 is reduced and stretched as in the present embodiment, the larger the stretching of the flange 11, the greater the bending straightening effect. Therefore, by reducing the fillet 12 having a large tensile residual stress in addition to the flange 11, the extension of the flange 11 becomes large as a whole. As a result, the bending straightening effect is improved even with the same rolling force, as compared with the case where only the flange 11 is rolled without rolling the fillet 12.
Further, when the conventional fillet 12 is not reduced, the fillet 12 is not plastically deformed, but in the correction method according to the present embodiment, the fillet 12 is also plastically deformed. Therefore, in the straightening method according to the present embodiment, the entire flange 11 is uniformly stretched, so that the flange 11 is easily stretched.

Here, as described above, the radius _{R a} of the web side corner portion 211, 221 is preferably below the radius _{R b} of the fillet 12, it is not less than the lower limit value of the radius _{R b} of the fillet 12 to be acceptable as a product ..
From the viewpoint of stretching the fillet 12 of the H-shaped steel 1 to improve the bending straightening ability, the web side corners 211 and 221 need to have a shape capable of appropriately reducing the fillet 12. When the radius R _a of the web side corners 211 and 221 is larger than the radius R _{b of} the fillet 12, there is a gap between the fillet 12 and the web side corners 211 and 221 of the inner rolls 21 and 22, so that the fillet It is difficult to effectively reduce 12. _{Therefore, in the present embodiment, it is desirable that the radius R a} of the web side corners 211 and 221 is equal to or less than the radius R _{b of the fillet 12.}

Further, the fillet 12 of the H-shaped steel 1 manufactured by hot rolling is formed into a _{radius R b equal to the fillet radius of the roll used for hot rolling. Further, a dimensional tolerance is generally set for the radius R b} of the fillet 12 of the product, and an upper limit value and a lower limit value are set. Therefore, as the radius R _b of the fillet 12 of the product is not less than the lower limit of the dimensional tolerance, the radius R _a of the web side corner portions 211 and 221, the lower limit value of the radius R _b of the fillet 12 to be acceptable as a product It is desirable that the above is the case.

As described above, in the straightening method according to the present embodiment, one flange 11 of the H-shaped steel 1 and one fillet 12 on the flange 11 side are rolled by using the straightening device 2, and the steel 1 is bent. The inner flange 11 of the is stretched. As a result, the length of one of the flanges 11 in the longitudinal direction becomes long, and bending can be corrected.
The adjustment of the roll gap between the outer surface roll 20 and the pair of inner surface rolls 21 and 22, that is, the adjustment of the reduction amount of the flange 11 and the fillet 12 is appropriately set according to the degree of bending such as the bending amount.

Further, the region in the longitudinal direction of the H-shaped steel 1 which is rolled and straightened by the straightening device 2 is appropriately set according to the aspect of bending. For example, when the bending occurs over the entire length of the H-shaped steel 1 in the longitudinal direction, the straightening may be performed by rolling the entire length of the H-shaped steel 1. Further, when the H-shaped steel 1 is partially bent in the longitudinal direction, the correction may be performed by rolling only the bent portion.

<Modification example>
Although the present invention has been described above with reference to specific embodiments, it is not intended to limit the invention by these descriptions. By reference to the description of the invention, one of ordinary skill in the art will appreciate the disclosed embodiments as well as other embodiments of the invention that include various modifications. Therefore, it should be understood that the embodiments of the invention described in the claims also include embodiments including these modifications described herein alone or in combination.

For example, in the above embodiment, the shaped steel to be straightened is H-shaped steel 1, but the present invention is not limited to such an example. The shaped steel to be straightened may have other cross-sectional shapes as long as it has a web and a flange. For example, as shown in FIG. 4, the section steel to be straightened has a cross-sectional shape of a web 10 extending in the left-right direction and a flange 11 connected to one end of the web 10 and extending in the vertical direction. Shaped steel 1A may be used. In the case of such a T-shaped steel 1A, since the flange 11 is at one place, the fillet 12 is also at one place. As for bending, the straightening method can be applied when the flange 11 is inside the bending, that is, when the flange 11 of the T-shaped steel 1A corresponds to the inner flange 11a in the above embodiment. Even in such a T-shaped steel 1A, as shown in FIG. 5, bending can be corrected by rolling the flange 11 and the fillet 12 using the straightening device 2.

Further, as shown in FIG. 6, dents 213 and 223 may be provided in the center of the end faces of the inner rolls 21 and 22 on the web 10 side. By doing so, the contact between the inner rolls 21 and 22 and the web 10 is suppressed.
Further, in the above embodiment, the H-section steel 1 is manufactured by hot rolling, but the present invention is not limited to such an example. The H-section steel 1 may be manufactured by welding assembly. Further, not only the H-shaped steel 1 but also the shaped steels of other shapes having a web and a flange as in the above-mentioned modified example, which are manufactured not only by hot rolling but also by welding assembly, can be corrected. May be applied. As the shaped steel to which the bending straightening method is applied, a shaped steel produced by hot rolling is more preferable. This is because shaped steel produced by welding assembly does not have a uniform arcuate shape, which may give the fillet excessive reduction compared to that produced by hot rolling. Is. However, the bending straightening method and apparatus of the present invention may be applied as long as the welded shaped steel has a smooth welded portion shape and little variation in the welded shape in the length direction.

Further, in the above embodiment, the H-section steel 1 is pressed and rolled by a pair of inner surface rolls 21 and 22, but the present invention is not limited to this example. For example, by fixing a pair of inner surface rolls 21 and 22 and making the outer surface roll 20 movable in the left-right direction, the H-shaped steel 1 may be pressed by the outer surface roll 20 for rolling. Further, the H-shaped steel 1 may be pressed and rolled by both the pair of inner surface rolls 21 and 22 and the outer surface roll 20.

Further, in the above embodiment, the correction is performed by using the outer surface roll 20 and the pair of inner surface rolls 21 and 22, but the present invention is not limited to such an example. In order to obtain a high bending straightening ability, the inner flange 11a and the fillet 12 may be rolled at the same time as described above, and the rolling may be performed using a roll or the like having a shape different from that of the above embodiment. When the outer surface roll 20 and the pair of inner surface rolls 21 and 22 are used as in the above embodiment, when the conventional straightening device for rolling only the flange is existing equipment, the pair of inner surface rolls 21 and 22 are on the web side. It can be applied only by providing the corners 211 and 221. Therefore, it can be easily and inexpensively applied to existing equipment.

Further, in the above embodiment, the fillet 12 has an arcuate shape, and the web-side corners 211 and 221 in contact with the fillet 12 are rounded in an arcuate shape. Not limited. If the shape of the fillet 12 does not need to be exactly arcuate as a product specification, the shape of the fillet 12 and the web side corners 211 and 221 may not be exactly arcuate according to this specification. .. In this case, the shape of the fillet 12 and the corners 211 and 221 on the web side may be such that the web 10 and the flange 11 are smoothly connected with a roundness. Further, for the web side corners 211 and 221 and the radii R _a and R _b of the fillet, the radius when approximated to an arc shape may be used.

Further, in the above embodiment, as shown in FIG. 1, the roll configuration of the straightening device 2 is composed of an outer surface roll 20 and a pair of inner surface rolls 21 and 22, but the present invention is not limited to such an example. The outer roll 20 and the pair of inner rolls 21 and 22 shown in FIG. 1 may be used as one roll set, and the straightening device 2 may be further provided with another roll set. In this case, the additionally provided roll set is provided on the opposite flange 11 side of the other roll set, and is configured to roll the opposite flange 11 of the other roll set. In such a case, by using one of the roll sets according to the bending direction of the H-shaped steel 1, the H-shaped steel 1 can be straightened without turning, so that the straightening can be performed efficiently. it can. Further, even if the H-shaped steel 1 is bent in both the left and right directions in an S shape, it can be corrected efficiently by correcting it using both roll sets.

<Effect of embodiment>
(1) The bending straightening method according to one aspect of the present invention is a bending straightening method for straightening the bending of a shaped steel having a web 10 and a flange 11 (for example, H-shaped steel 1 or T-shaped steel 1A). Then, the inner flange 11A, which is the inner flange 11 of the bend, and the fillet 12 which is the boundary between the inner flange 11A and the web 10 are rolled.
According to the configuration of (1) above, in addition to the flat portion of the flange 11 inside the bend, the fillet 12 is also rolled and stretched at the same time. Therefore, as compared with the conventional straightening method in which only the flat portion of the flange 11 is rolled and the fillet 12 is not rolled, the amount of stretching is large even with the same rolling amount, and a larger bend can be straightened. Further, since the fillet 12 is also plastically deformed at the time of straightening, the entire flange 11 is uniformly stretched, and the flange 11 is easily stretched. Therefore, a higher bending straightening ability can be obtained.

(2) In the configuration of the above (1), when the inner flange 11A and the fillet 12 are rolled, the outer surface roll 20 in which the peripheral surface of the roll comes into contact with the outer surface flange which is the opposite surface of the web 10 of the inner flange 11A. The inner flange 11A and the fillet 12 are rolled by a pair of inner surface rolls 21 and 22 in which the roll peripheral surface contacts the inner surface of the flange and the fillet 12, which are the surfaces of the inner flange 11A on the web side, and the pair of inner surface rolls 21. , 22 are arranged with the web 10 in between, and have a shape in which the web-side corners 211 and 221 which are the end face corners on the web 10 side are rounded and cut out, respectively, and the web-side corners 211 and 221 are respectively. Contact the fillet 12.
According to the configuration of (2) above, when a conventional straightening device for rolling only the flange 11 is provided as an existing facility, the straightening method can be easily and inexpensively applied to the existing facility.

(3) In the configuration of (2) above, the arcuate radius R _{a of the web side corners 211 and 221 is equal to or less than the radius R b} of the fillet 12 before correction, and the lower limit value _{of the radius R b} of the fillet 12 of the product. That's all.
According to the configuration of (3) above, it is possible to obtain a higher bending straightening ability while satisfying the specifications of the shaped steel product.

(4) The bending straightening device 2 according to one aspect of the present invention is a bending straightening device 2 for correcting the bending of a shaped steel having a web 10 and a flange 11, and is an inner flange 11 which is an inner flange 11 of the bending. The outer surface roll 20 in which the peripheral surface of the roll contacts the outer surface flange which is the opposite surface of the web 10 of the flange 11a, the inner surface of the flange which is the surface of the inner flange on the web 10 side, and the boundary between the inner flange 11A and the web 10. A pair of inner surface rolls 21 and 22 in which the peripheral surfaces of the rolls are in contact with the fillet 12, and a pair of inner flanges 11a and the fillet 12 are rolled by the outer surface roll 20 and the pair of inner surface rolls 21 and 22. The inner surface rolls 21 and 22 of the above are arranged with the web 10 sandwiched between them, and have a shape in which the web side corners 211 and 221 which are the end face corners on the web 10 side are rounded and cut out, respectively, and the web side corners. The portions 211 and 221 come into contact with the fillet 12.
According to the configuration of (4) above, the same effect as the configurations of (1) and (2) above can be obtained.

(5) In the configuration of (4) above, the arcuate radius R _{a of the web side corners 211 and 221 is equal to or less than the radius R b} of the fillet 12 before straightening, and is the lower limit value _{of the radius R b} of the fillet 12 of the product. That is all.
According to the configuration of the above (5), the same effect as the configuration of the above (3) can be obtained.

As an example of the present invention, the bending of the H-shaped steel 1 was straightened by using the straightening device 2 shown in FIG. In the examples, the bending of the H-section steel 1 having a web height H of 600 mm, a flange width B of 300 mm, a web thickness t _w of 16 mm, a flange thickness t _f of 22 mm, and a yield strength standard of 320 MPa was corrected. Further, as the H-shaped steel 1 to be straightened, a steel having a length of 8 m in the longitudinal direction and having a bend having substantially the same curvature as a whole was used. The total bending (bending amount defined by δ in FIG. 7) of the H-shaped steel 1 before straightening was 23 mm, which exceeded the dimensional tolerance of ± 8 mm (1 mm per 1 m in length).

In the embodiment, in order to correct this bending, the flange inside the bending was rolled with a rolling load of 115 tonf. When the bending amount was measured after rolling the total length, the bending amount of the total length was reduced to 3 mm, and it was possible to correct the bending amount within the dimensional tolerance.
Next, using the H-section steel 1 having the same cross-sectional dimensions and length and a bending amount of 24 mm, bending was corrected by a straightening device that does not reduce the fillet 12 as in Patent Document 1 (comparative example). The configuration of the orthodontic appliance 3 in the comparative example is shown in FIG. As shown in FIG. 9, the straightening device 3 used in the comparative example has an outer surface roll 30 and a pair of inner surface rolls 31 and 32. The outer surface roll 30 has the same configuration as the outer surface roll 20 in the above embodiment. Further, unlike the pair of inner surface rolls 21 and 22 in the above embodiment, the pair of inner surface rolls 31 and 32 do not have the web side corner portions 211 and 22 as the shape of the roll peripheral surface, and the flat portions 212 and 222 are configured. Only made similar.

Further, in the comparative example, the flange 11 on the bent inner side was rolled with the rolling load set to 115 tonf as in the embodiment. When the bending was measured after rolling the total length, the bending of the total length was reduced to 8 mm, but there was no margin because it was the upper limit of the dimensional tolerance, and the amount of correction of the bending was insufficient.
As described above, according to the bending straightening method according to one aspect of the present invention, a bending straightening effect larger than the conventional one can be obtained even with the same reducing force. Therefore, it is possible to correct a larger bend. Further, since it can be applied to the conventional straightening equipment as shown in FIG. 9 only by modifying the inner rolls 31 and 32, it is possible to obtain a large bending straightening effect with a small equipment cost even with the existing equipment. it can.

1 H-section steel 1A T-section steel 10 Web 11 Flange 11A Inner flange 12 Fillet 2 Straightening device 20 Outer surface roll 21,22 Inner surface roll 211,221 Web side corner part 212,222 Flat part 213,223 Indentation 3 Straightening device 30 Outer surface roll 31,32 Inner surface roll

Claims (5)

A bending straightening method that straightens the bending of shaped steel with webs and flanges.
A method for straightening a bend, in which an inner flange, which is an inner flange of the bend, and a fillet, which is a boundary between the inner flange and the web, are rolled. When rolling the inner flange and the fillet
The outer surface of the roll, whose peripheral surface contacts the outer surface flange of the inner flange on the opposite side of the web, and the inner surface of the flange, which is the surface of the inner flange on the web side, come into contact with the fillet. The inner flange and the fillet are rolled with a pair of inner rolls.
The pair of inner surface rolls are arranged with the web sandwiched between them, and each of the web side corners, which are the end face corners on the web side, has a rounded shape, and the web side corners are on the fillet. The method for correcting a bend according to claim 1, wherein the bend is brought into contact. The method for straightening a bend according to claim 2, wherein the arcuate radius of the web side corner is equal to or less than the radius of the fillet before straightening and equal to or greater than the lower limit of the radius of the fillet of the product. A bending straightening device that straightens the bending of shaped steel with webs and flanges.
An outer roll in which the peripheral surface of the roll contacts the outer flange, which is the opposite surface of the web of the inner flange, which is the inner flange of the bend.
A pair of inner surface rolls in which the peripheral surfaces of the rolls come into contact with the inner surface of the flange, which is the surface of the inner flange on the web side, and the fillet, which is the boundary between the inner flange and the web.
With
The inner flange and the fillet are rolled by the outer roll and the pair of inner rolls.
The pair of inner surface rolls are arranged with the web sandwiched between them, and each of the web side corners, which are the end face corners on the web side, has a rounded shape, and the web side corners are on the fillet. Bending straightening device that comes into contact. The bending straightening device according to claim 4, wherein the arcuate radius of the web side corner is equal to or less than the radius of the fillet before straightening and is equal to or greater than the lower limit of the radius of the fillet of the product.

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