JP2002282945A - Roller leveler for h-shaped steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller leveler capable of stably flatten an H-shaped steel without causing a local high reduction to a web and a flange. SOLUTION: The outer sides 3a of the flange 3 are repeatedly compressed vertically and alternately to be flattened by collar parts 10 of a pair of collared rollers 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller straightening device for straightening an H-section steel manufactured by rolling or welding assembly.

[0002]

2. Description of the Related Art As a method for continuously correcting the bending and warping of an H-section steel manufactured by rolling or welding assembly in a cold state, a method of correcting the web portion by repeatedly pressing down a web portion with a correcting roller is generally used. It is a target. FIG. 8 shows a state of continuous cold straightening of the H-section steel 50 by the straightening roller 51, which is generally performed. That is, the H-section steel 5
A plurality of straightening rollers 51 are arranged in a staggered manner vertically with respect to the web passing position along the transport direction of 0, and the upper and lower surfaces of the web 50a of the H-shaped steel 50 being transported are straightened rollers 51 (horizontal rollers). By repeatedly performing the draft correction alternately, plastic deformation is applied to the flange 50b having high rigidity through the web 50a, whereby the bending and the warping are corrected.

[0003]

However, when the flange 50b having high rigidity is deformed via the web 50a, a high surface pressure is locally generated on the web 50a, so that the web height L is increased or the web 50a is deformed. Shape defects such as bending of 50a were likely to occur.

In the above-described method, the web 50a is reduced while the side surface of the correction roller 51 is in contact with the inner side surface of the flange 50b, but the boundary between the circumferential surface and the side surface of the correction roller 51 is reduced. Of the H-section steel must be replaced every time the radius of the H-shaped steel changes, which hinders the size-free device. It is a factor.

In order to avoid such disadvantages of the web press correction system, for example, Japanese Patent Application Laid-Open No.
There is disclosed a straightening system in which a load is directly applied to a flange by pressing a tip end surface of a flange of a section steel with a straightening roller. However, when directly pressing the front end face of the flange, there are the following problems.

[0006] That is, since the H-section steel produced by hot rolling is usually formed by a combination of a universal rolling mill and an edging rolling mill, the flange width of the product cannot be compared with the thickness of the web. There is fluctuation, and it is difficult to obtain a stable pressing amount. In addition, pressing the flange tip surface locally increases the surface pressure at the flange tip, causing problems such as a reduction in flange width due to deformation due to rolling down and an uneven thickness due to bulging of the flange tip. It was easy.

[0007] That is, in the web press correction system, since a local high surface pressure is generated on the web, there is a problem in shape and material. In a method in which the front end face of the flange is directly lowered and the web is not damaged, it is difficult to obtain a target reduction amount (pressing amount) stably due to the dimensional fluctuation of the flange width, and the front end face of the flange is crushed. In addition, there is a problem that the width is narrowed and the thickness of the flange end portion is not uniform.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is capable of stably correcting an H-shaped steel roller without causing local high pressure on a web or a flange. It is an object to provide a straightening device.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention is directed to the invention in which a plurality of straightening rollers are provided along the conveying direction of the H-shaped steel to be straightened. H-shaped steel webs are placed in a zigzag pattern with respect to the passing position,
In the roller straightening device for performing the correction by repeatedly applying the plastic strain of the bending to the H-section steel conveyed by the correction roller, each of the above-mentioned correction rollers can have a circumferential surface that can contact a tip end face of the H-section steel flange. And a pair of disc-shaped flanges disposed coaxially with the roller body and projecting radially outward from the roller body. Side faces of the pair of flanges facing each other are H-shaped. The steel flanges are arranged so as to be in contact with and pressurized on the outer side surfaces thereof, and the interval between the opposing side surfaces is set so as to increase continuously as going outward in the radial direction. Things.

Next, the invention described in claim 2 is characterized in that at least the facing distance between the pair of flanges can be changed with respect to the invention described in claim 1. is there. Next, according to a third aspect of the present invention, in the configuration described in the first or second aspect, each of the correction rollers is provided between the pair of roller bodies with the H-shaped steel web passing position interposed therebetween. Is characterized in that a web support roller for contacting the web of the H-section steel is provided on the opposite side.

[0011] Next, according to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the side surface of the flange portion is formed along the radial direction of the flange of the H-section steel. It is characterized in that it can contact the outer side surface with at least half of the flange width. Next, according to the invention described in claim 5, the configuration according to any one of claims 1 to 4, with respect to the preceding stage of the correction roller group, H-shaped steel,
It is characterized by including a guiding roller for guiding the biting into the correcting roller group while regulating the position in the flange width direction.

According to the present invention, when the bending and warping of an H-section steel is continuously corrected in a cold state, the disadvantages caused by the large plastic deformation in the dimensions, shape, mechanical properties and the like caused by the cold state can be reduced. It is a roller straightening device that performs straightening while suppressing. That is, since the present invention corrects by directly applying a load to the flange governing the bending and warpage of the H-section steel, the damage to the web is greatly reduced as compared with the case where a bending load is applied to the flange via the web. Is reduced.

Further, even when a bending load is directly applied to the flange, if a main load for correction is applied to the front end face of the flange as in the above-described conventional example, a local high surface pressure is generated in a narrow area. However, there is a problem in that the thickness is uneven at the tip of the flange and the flange width is reduced.
On the other hand, in the present invention, since the bending load is applied so as to be received in a wide range on the outer surface of the flange, it is possible to prevent the flange width from being reduced and the flange tip portion from being crushed.

That is, the interval between the pair of flanges is continuously narrowed from the outer diameter direction to the inner diameter direction. As a result, the contact area between the outer surface of the flange and the side surface of the flange is increased, and the phenomenon that a locally high surface pressure acts can be reduced. Then, the bending and warping of the H-section steel are changed by alternately repeating the indentation reduction.

Further, by applying a compressive force to the web, the height of the web that is larger than the target value is reduced in accordance with the web height, thereby correcting the web height. Here, the horizontal component force of the reaction force acting on the side surface of the flange acts as a compressive force on the web, but the distance between the pair of flange portions may be adjusted so that most of the reaction can be accommodated by deformation within the elastic range. . That is, as described in the second aspect, the distance between the pair of flanges can be changed according to the web height of the material to be corrected, thereby enabling correction of H-shaped steel having different dimensions.

Since the interval between the pair of flanges is continuously narrowed from the outer diameter direction to the inner diameter direction, when a compressive force is applied to the web, the web is moved in the thickness direction. Bend. As the correcting roller deforms the flange interval of the material to be corrected narrower on the roller inner diameter side, as described above, the web deforms so as to expand toward the opposite side to the roller body.
If the deformation of the web is not suppressed, the horizontal component of the bending reaction force may be reduced accordingly.

On the other hand, according to the third aspect, the deformation such as swelling of the web is suppressed by the web support roller, and the correction roller can surely receive the horizontal component force of the bending reaction force. . Thereby, the correction is performed more efficiently. Further, according to the invention described in claim 4, the side surface of the flange restrains the outer surface of the flange so as to include the extension line of the web, so that the horizontal component force at the time of straightening is securely and efficiently transmitted to the web. It becomes possible.

Further, when the correction roller starts to bite,
Since the flange starts to come into contact with the side surface of the flange at the point contact, if the shape difference between the correcting roller and the H-shaped steel is large, it is difficult for the correcting roller to rotate and draw in the H-shaped steel. On the other hand, according to the invention of claim 5, the H-section steel is guided by the guide roller, and the H-section steel can be advanced to near the center of the correction roller. When the H-section steel is advanced to near the center of the correction roller, the H-section steel can be transported by the rotation of the correction roller.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a roller straightening device according to the present embodiment, and FIG. 2 shows a configuration of a straightening roller of the present embodiment. In the present embodiment, a case where the straightening is performed while the H-shaped steel 1 is being conveyed in a state where the web 2 is in a horizontal position will be described as an example. In the following description, H
The web of section steel 1 is simply called web 2 and the flange of H section steel 1 is simply called flange 3.

As shown in FIG. 1, the roller straightening device is provided with a plurality of straightening rollers 4 arranged along the conveying direction of the H-shaped steel 1 to be straightened, and at a stage preceding the straightening rollers 4 group. And a guiding roller 5. In FIG. 1, N
o. Nos. 1 and 2 are the guiding rollers 5, 3-8
Are the correction rollers 4 described above. In addition, No. Reference numeral 9 denotes a transport roll 12 without a collar.

Each of the correcting rollers 4 includes a flanged roller 6 and a web supporting roller 7, as shown in FIG. The configuration of the flanged roller 6 will be described.
And a pair of roller bodies 9 supported so as to be able to change the axial position with respect to the shaft member 8. The shaft member 8 is arranged orthogonal to the conveying direction of the H-section steel 1 and has a horizontal axis. That is, it extends along the facing direction of the pair of flanges 3. Also, each of the roller bodies 9 has a disk-shaped flange 10 whose surface is in contact with the outer surface 3 a of the flange 3.
Are formed integrally.

That is, a pair of flanges 10 are opposed to the flanged roller 6 so as to sandwich the pair of flanges 3 and a roller body 9 portion (hereinafter referred to as a tip) inside the flange 10. Pressing portions) can be opposed to the front end surfaces of the flanges 3 respectively. A side surface of the flange portion 10 that contacts the flange 3 is a flange contact surface 10a.
In other words, the facing distance H between the pair of opposed flange contact surfaces 10a is set so as to gradually increase as the distance from the roller body 9 in the outer diameter direction increases. That is, the collar 1
0 is inclined outward (in a direction away from the flange 3) with respect to the direction perpendicular to the roller axis (FIG. 6).
reference). The contour of the tip of the flange contact surface 10a has an arc shape.

Further, by displacing the pair of roller bodies 9 along the shaft member 8, the facing distance H between the pair of flanges 10 can be adjusted according to the web height. For example, this is realized by providing the roller body 9 with a spline connection to the shaft member 8 and fixing means for fixing at the position after the position adjustment. Then, with respect to the facing distance H between the pair of flange contact surfaces 10a, the facing distance H at the boundary portion (the innermost portion) with the tip pressing portion is set smaller than the web height, and the tip portion of the flange portion 10 ( The facing distance H at the outermost portion is set to be larger than the web height.

The web support roller 7 is a horizontal roller disposed on the opposite side of the flanged roller 6 in the vertical direction with the web 2 of the H-section steel 1 interposed therebetween, and includes a shaft member and a shaft member. A roller body is provided at the center and has a circumferential surface that can contact the surface of the web 2. The correction roller 4 having the above-described configuration includes a set of a flanged roller 6 and a web support roller 7 similar to the above-described configuration.
Plural pieces are arranged in a zigzag pattern so as to be alternately arranged on the upper side and the lower side with the web 2 of the section steel 1 interposed therebetween.

Further, as shown in FIG. 3, the guiding roller 5 is configured by arranging the flanged roller 11 having the above-described configuration vertically above and below the web 2 passing position. Next, the operation, operation and effect of the roller straightening device having the above configuration will be described. The engagement of the H-section steel 1 into the flanged roller 6 is as follows.
Since the contact between the flange 3 and the flange contact surface 10a starts at a point contact, it is difficult to pull in only the rotation of the straightening roller by rotation. It is necessary to reach near the center. After reaching the vicinity of the roller center, the H-shaped steel 1 can be transported by the rotation of the correction roller 4.

In view of this, in the present embodiment, the guiding roller 5 is constituted by a pair of flanged rollers 11 which are arranged parallel to each other and vertically opposed to each other so that the flange width can be reduced. And at the same time, it is easy to push the N0.3 flanged roller 6 that constitutes the correction roller 4 at the most upstream position into the flanged roller 6. From the viewpoint of the flange width regulation, it is preferable that the vertical distance between the two rollers 11 is passed through in accordance with the smallest width of the product measured by the cold dimension meter in the preceding process.

As described above, the two guide rollers 5 reduce the flange width difference to a small extent, and the no. 3
Of the correction rollers 4 arranged in a staggered manner, the bending rollers 6 of the plurality of correction rollers 4 are repeatedly bent in the vertical direction, and the curvature of the web 2 generated at the time of the correction is reduced. It is regulated by the web support roller 7.

As a result, a correction is made, and then N
o. 9 are transported downstream by the transport rollers 12. Next, the principle that the straightness can be obtained by giving the above-described plastic deformation by the straightening roller group will be described with reference to FIGS. 4 and 5. 4 and 5 are schematic diagrams, in which the rotation axis of the web support roller 7 is illustrated as being displaced up and down, but does not actually move.

For example, as shown in FIG. 4, taking the correction roller 4 in which the flanged roller 6 is disposed on the upper side as an example, the pair of flanges 3 is in an H-shape with the flanged roller 6 in the inverted C state. When the steel 1 starts to bite, as shown in FIG. 4 (a), the outer surface 3a of the flange 3 slides into the flange contact surface 10a of the inclined flange portion 10 and starts biting, and the flange contact surface 10a The flange 3 penetrates in the inner diameter direction along the inclination (see FIG. 4B), and the front end surface of the flange 3 comes into contact with the circumferential surface of the roller body 9 and the outer surface 3a of the flange 3 becomes the flange contact surface 10a. (See FIG. 4 (c)). At this time, the web 2 bends to the opposite side (downward) from the flanged roller.
When the web 2 is deformed in this manner, the outer surface 3a of the flange 3 (the roller flange 10
The tip of the flange 3 is pressed down by the roller body 9 at a high surface pressure.

FIG. 5 shows a state from the start of biting to the completion of biting when the flanged roller 6 is on the lower side. The behavior is the same as that of FIG. However, in the present embodiment, by providing the web support roller 7, when the H-section steel 1 starts to bite into the flanged roller 6, the web 2 does not contact the support roller and the bite proceeds. In a state where the circumferential surface of the support roller comes into contact with the lower surface of the web 2 and the biting is completed, the curvature of the web 2 is regulated by the web support roller 7. As a result, the ratio of the force that bends the H-section steel 1 in the vertical direction to the outer surface 3a of the flange 3 increases, so that the local surface pressure generated at the front end surface of the flange 3 is reduced, and the flange width B decreases. In addition, it is possible to prevent a problem that the thickness of the tip bulges and becomes uneven.

The outer surface 3a of the flange 3 has a large contact area with the side surface of the flange 10 (flange contact surface 10a), as shown in FIG. 6, so that a bending force for straightening is applied. In addition, a phenomenon in which locally high surface pressure acts can be reduced. In addition, since a compressive force corresponding to the web height L is applied to the web 2, the web height L is also corrected.

Here, the flange contact surface 10a of the flange 10
A flange angle θ (see FIG. 6), which is an inclination from a direction perpendicular to the axis,
When the relationship between the deformation force Pw applied to the web 2 and the surface pressure Pr at the tip of the flange 3 was obtained, the result shown in FIG. 7 was obtained. That is, as the flange angle θ increases, the deformation force Pw applied to the web 2 increases, and conversely, the surface pressure Pf at the tip of the flange 3 decreases.

When the allowable value is determined according to the cross section and the material properties of the H-section steel 1, the range of inclination θ1 to θ2 of the flange 10 suitable for straightening is determined. In the present invention, as a result of applying the method to a standard external constant H-beam 1, a flange 1 suitable for straightening is obtained.
Since the inclinations θ1 to θ2 of 0 were 1 to 3 degrees, the flange angle was set to 1 to 3 degrees. Here, the outer surface 3a of the flange 3 and the flange contact surface 10a of the flange portion 10 come into contact with each other, so that the horizontal component force of the bending force is sufficiently replaced by the compressive force of the web 2 so as to extend along the radial direction. Contact length W
Correction conditions that can maintain a relationship of> 0.5B are preferable (see FIG. 6).

As described above, since the flange is not bent via the web 2, it is possible to continuously correct the bending and warpage of the H-shaped steel 1 without causing deformation of the web 2 and deterioration of mechanical properties. In addition, since the reaction force is applied over a wide range of the outer surface 3a of the flange 3 instead of the method of rolling down only the front end surface of the flange 3, fluctuations in the width of the flange 3 and uneven thickness of the front end portion can be reduced.

Further, a compressive force is exerted on the web 2, and a web having a large web height L is reduced and a web having a small web height L does not change as it is, so that the web height accuracy is improved.
In addition, when the correction roller 4 starts to bite, the difference in shape between the flanged roller 6 and the H-shaped steel 1 is generally large, so that it is difficult to pull in the H-shaped steel by the rotation of the correction roller 4. On the other hand, by providing the guide roller 5 at the front stage, the H-section steel advances to the vicinity of the center of the roller by the external force of the pinch roller or the like. As a result, the conveyance of the H-section steel by the rotation of the correction roller 4 is prevented. It becomes possible.

Here, the flange contact surface 10a is inclined by a flange angle θ with respect to the direction perpendicular to the axis. In accordance with this inclination, the circumferential surface of the roller body 9 is also inclined by θ with respect to the axial direction. The intersection angle between the circumferential surface of the roller body 9 and the flange contact surface 10a may be set to 90 degrees. Further, in the above embodiment, the case where the roller body 9 and the flange 10 are integrated is illustrated, but the roller body 9 and the flange 10 may be configured separately. For example, the shaft member 8 is a roller body,
The flanged roller 6 may be configured by attaching the flange portion 10 to the shaft member 8 so as to be movable in the axial direction.

[0037]

As described above, when the roller straightening apparatus of the present invention is employed, it is possible to continuously correct the bending and warpage of the H-shaped steel while suppressing the adverse effects such as the deformation of the web and the fluctuation of the width of the flange. . In addition, correction of the web height is also performed.

At this time, according to the second aspect of the invention,
Correction of H-shaped steel with different dimensions can be handled by the same correction roller. According to the third aspect of the invention, there is an effect that the correction can be performed efficiently. According to the fourth aspect of the invention, since the contact of the flange portion with the outer surface of the flange includes an extension of the web, the horizontal component force of the bending force applied to the outer surface of the flange is ensured. In addition, since the web can be efficiently replaced with the web compression force, the web height can be efficiently corrected.

Further, according to the fifth aspect of the present invention, the H-section steel can be engaged with the straightening roller without any problem.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a roller row in a roller straightening device according to an embodiment based on the present invention, where (a) shows a plan view and (b) shows a side view.

FIG. 2 is a front view showing a configuration of a correction roller according to the embodiment based on the present invention.

FIG. 3 is a front view showing a configuration of a guiding roller according to the embodiment based on the present invention.

FIG. 4 is a diagram illustrating an example of a behavior of the H-shaped steel and the straightening roller according to the embodiment based on the present invention in a case where a flanged roller is disposed on the lower side. ,
(B) shows a state in which biting is in progress, and (c) shows a state in which biting is completed.

FIGS. 5A and 5B are diagrams illustrating an example of a case where a flanged roller is disposed on an upper side, illustrating behaviors of an H-section steel and a correction roller according to an embodiment of the present invention. FIG.
(B) shows a state in which biting is in progress, and (c) shows a state in which biting is completed.

FIG. 6 is a schematic diagram showing a relationship between a straightening roller and an H-section steel.

FIG. 7 is a diagram showing the relationship between the flange angle θ, the surface pressure at the tip of the flange and the deformation force applied to the web.

FIG. 8 is a perspective view illustrating a roller straightening machine in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H-shaped steel 2 Web 3 Flange 4 Correction roller 5 Guide roller 6 Roller with flange 7 Web support roller 8 Shaft member 9 Roller body 10 Flange 10a Flange contact surface θ Flange angle L Web height B Flange width W Contact length S H Opposition distance

Claims (5)

[Claims] Along the conveying direction of the H-shaped steel to be straightened,
A roller straightening device in which a plurality of straightening rollers are arranged in a zigzag manner with respect to the position where the web of the H-shaped steel passes, and a straightening is performed by repeatedly applying plastic strain to the H-shaped steel conveyed by the straightening rollers. In each of the above-mentioned correction rollers, a roller body whose circumferential surface can be in contact with the tip end surface of the H-section steel, respectively, and a pair of coaxial rollers arranged coaxially with the roller body and projecting radially outward from the roller body. And a pair of flanges, wherein opposing side surfaces of the pair of flanges are arranged so as to be in contact with and pressable with the outer surface of the H-section steel flange, respectively, and the distance between the opposing side surfaces. The roller straightening device for an H-section steel is set so as to continuously increase as it goes radially outward. 2. The roller straightening apparatus for an H-section steel according to claim 1, wherein at least the facing distance between the pair of flanges is changeable. 3. The correction roller according to claim 1, further comprising a web supporting roller abutting on the H-shaped steel web on a side opposite to the pair of roller bodies with respect to the H-shaped steel web passing position. H according to claim 1 or claim 2
Roller straightening device for shaped steel. 4. The method according to claim 1, wherein the side surface of the flange portion is capable of making contact with the outer surface of the flange of the H-section steel at least half the flange width along the radial direction. Item 4. A roller straightening device for H-section steel according to any one of Items 3. 5. A guide roller for guiding a bite of an H-section steel into the correction roller group while regulating a position in a flange width direction with respect to a preceding stage of the correction roller group. The roller straightening device for an H-section steel according to any one of claims 1 to 4.