JP2014184455A - Manufacturing facility for shaped steel and manufacturing method for shaped steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing facility for a shaped steel and a manufacturing method for a shaped steel whereby a shaped steel, of which a curve is eliminated and which is corrected, can be manufactured with a good efficiency and at a low cost.SOLUTION: A manufacturing facility for manufacturing a shaped steel 10 having a web 11 and flanges 12, 12 comprises: a hot rolling device 1 for forming a steel raw material into a long shaped steel of a predetermined cross-sectional shape having the web 11 and the flanges 12, 12; a curve leveler 2 which rolls the flange 12 and levels a curve of the long shaped steel; and a cutter 3 for cutting a long H-shaped steel. From the upstream side to the downstream side in a transportation direction of the steel raw material or the shaped steel in the manufacturing facility, the hot rolling device 1, the curve leveller 2 and the cutter 3 are disposed in this order.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing equipment and a manufacturing method for a shape steel having a web and a flange, and more particularly to a manufacturing equipment and a manufacturing method for a shape steel capable of manufacturing a shaped steel having a bent shape removed and corrected.

  Shaped steels with webs and flanges typified by H-shaped steel are manufactured by welding assembly and hot rolling of steel plates, but due to non-uniform heating, cooling and plastic deformation in the manufacturing process. In some cases, the whole or part of the longitudinal direction is bent or warped, and a straight product may not be obtained. In addition, a defective product having a twist in which bending and warping are combined may occur. In order to remove such bends and warpage and make a straight product, cold correction is generally performed before product shipment.

  In the present invention, bending and warping are as follows. Referring to FIGS. 5 and 6, an H-section steel will be described as an example. The H-section steel 10 includes a web 11 and two flanges 12 and 12 provided on both sides of the web 11 in the height direction. However, in the posture in which the web 11 is horizontal and the flange 12 is vertical (hereinafter also referred to as “H posture”), the bending is the left-right direction (web) as shown in FIG. The curvature δ in the height direction means warpage, and the warp means the curvature S in the vertical direction (flange width direction) as shown in FIG.

  As a method of straightening the shape steel, a method of applying a bending stress to the shape steel using a press as disclosed in Patent Document 1 or a plurality of staggered arrangements as disclosed in Patent Document 2 are provided. A roller correction method in which a web is crushed using a roller is generally used. Further, as disclosed in Patent Document 3, there is also known a method for efficiently correcting the bending of a shape steel by rolling and stretching a flange.

  The method disclosed in Patent Document 3 will be described in detail. This straightening method includes an outer surface roll that presses the flange from the surface opposite to the web, and both of the web rolls from both ends of the web in the height direction. A pair of straightening rolls that press a flange having flange portions (referred to here as a right flange portion and a left flange portion) from the surface on the web side and sandwich the right flange portion and the left flange portion between the outer surface rolls. And a bending correction method in which a predetermined rolling force is applied to both opposing rolls inside and outside the flange to pinch the flange. Such a correction method by rolling can correct local bending of the shaped steel. Moreover, since it can correct | amend while conveying a shape steel, it is advantageous at the point of the processing efficiency of correction.

JP 2008-030090 A Japanese Patent Application Laid-Open No. H8-174069 JP 2002-282934 A

  However, the straightening method using a press as disclosed in Patent Document 1 can correct both the bending and warping of the shape steel, but the longitudinal position to be reduced in the shape steel is selected according to the bending situation. After that, it was necessary to correct by reducing with an appropriate reduction force. Moreover, since there are many cases where a plurality of reductions are required for correction, there is a problem that the time required for correction is long.

  On the other hand, the straightening method using the roller disclosed in Patent Document 2 is a highly efficient straightening method capable of removing warping of various sizes in addition to a short time required for straightening. However, there is a problem that the correction ability is low for bending. Patent Document 2 discloses a roller straightening machine in which not only a horizontal roll but also a saddle roll is installed, but according to the study by the present inventors, the curling straightening ability of the roller straightening machine is not improved even when a saddle roll is added. Often not enough.

  On the other hand, the method of patent document 3 which corrects a curvature by extending | stretching a flange by rolling the flange inside the curvature radius direction of a curvature with a roller has a high curvature correction effect, and is excellent also from the surface of processing capacity. However, since the straightening device disclosed in Patent Document 3 is a device for cold rolling a flange of a section steel, it is necessary to apply a large rolling load to the flange in straightening. Therefore, there is a problem that the load resistance required for the straightening device is large and the equipment cost is high.

In addition, since the bend correction is performed on the short shape steel cut to the product length, there is a problem that the time required for the correction is long and the efficiency is low. In many cases, the material passing speed when the shape steel passes through the straightening device is slow at the tip and tail ends of the shape steel and fast at the intermediate portion (steady portion). Further, when the end portion of the shape steel is bitten between the two rolls of the straightening device, it takes time because alignment for guiding the shape steel to the center of the straightening device is necessary. From these circumstances, the time required for correction increases as the length of the shape steel is shorter and the number of shape steels to be corrected is larger.
Therefore, the present invention solves the problems of the prior art as described above, and provides a shape steel production facility and a shape steel production method for efficiently and low-cost production of a shaped steel having a curved portion removed and corrected. The issue is to provide.

  In order to solve the above-described problems, an aspect of the present invention has the following configuration. In other words, the structural steel manufacturing facility according to one aspect of the present invention is a structural steel manufacturing facility for manufacturing a structural steel having a web and a flange, and a steel material having a predetermined cross-sectional shape having the web and the flange. A hot rolling device for forming a long shaped steel, a bend straightening machine for rolling the flange to correct the bending of the long shaped steel, and a cutting machine for cutting the long shaped steel. The steel material or the shape steel in the manufacturing facility is arranged from the upstream side to the downstream side in the conveying direction of the hot rolling device, the bend straightening machine, and the cutting machine in this order. And

In this shape steel manufacturing facility, a bending measuring device for measuring the bending of the long shape steel may be provided between the hot rolling device and the bend straightening machine.
Further, a method for manufacturing a section steel according to another aspect of the present invention is a method for manufacturing a section steel having a web and a flange, wherein the web and the flange are formed by hot rolling a steel material. It is formed into a long section steel having a predetermined cross-sectional shape, and a flange of the formed long section steel is rolled to correct the bending of the long section steel, and then the long section steel is It is characterized by cutting.
In this method of manufacturing a shaped steel, the bending of the long shaped steel may be measured after the forming, and the correction may be performed based on the measurement result of the bending.

The shape steel manufacturing facility according to the present invention has a bend straightening machine disposed between a hot rolling device and a cutting machine, so that it is possible to efficiently and inexpensively produce a shape steel with the bend removed and straightened. it can.
In addition, the method for producing a shaped steel according to the present invention corrects the bending until it is cut after being formed into a long shaped steel having a predetermined cross-sectional shape. Can be manufactured efficiently and at low cost.

It is a schematic diagram explaining one Embodiment of the manufacturing equipment of the shaped steel which concerns on this invention. It is the schematic diagram which expanded and showed a part of manufacturing equipment of the shape steel of FIG. It is a figure explaining the structure of the straightening machine with which the manufacturing equipment of the shape steel of FIG. 1 is provided. It is a schematic diagram explaining the modification of the manufacturing equipment of the shape steel of FIG. It is a figure explaining the bending of H-section steel. It is a figure explaining the curvature of H-section steel.

  DESCRIPTION OF EMBODIMENTS Embodiments of a section steel manufacturing facility and a section steel manufacturing method according to the present invention will be described in detail with reference to the drawings. Drawing 1 is a mimetic diagram explaining one embodiment of the manufacturing equipment of the shape steel concerning the present invention. FIG. 2 is an enlarged schematic view showing a part of the structural steel production facility of FIG. Further, FIG. 3 is a diagram for explaining the structure of the bending straightening machine provided in the equipment for manufacturing the shaped steel of FIG. 1, and is a front view of the H-shaped steel as viewed from the end in the longitudinal direction.

  FIGS. 1 and 2 are structural steel manufacturing equipment for manufacturing a H-section steel 10 having a web 11 and flanges 12 and 12 by hot rolling. For example, a steel material having a rectangular cross section is hot-rolled and formed. A hot rolling apparatus 1 for forming a long H-shaped steel having a predetermined cross-sectional shape having a web 11 and a flange 12, and a bend straightening machine 2 for rolling the flange 12 to correct the bending of the long H-shaped steel. The cutting machine 3 for dividing the long H-shaped steel into, for example, product lengths, and the cooling bed 4 for cooling the cut short H-shaped steel 10 are provided from the upstream side of the manufacturing equipment. The hot rolling device 1, the bend straightening machine 2, the cutting machine 3, and the cooling bed 4 are arranged in this order toward the downstream side.

  Since the long H-section steel manufactured by the hot rolling apparatus 1 may be bent or warped, the long H-section steel having the bend is transferred to the conveying line 9 of the manufacturing equipment for the section steel. Is introduced into the bend straightening machine 2 and the bend is straightened by rolling the flange 12. Then, the long H-shaped steel whose curvature is corrected is introduced into the cutting machine 3 by the conveying line 9 and cut into a desired length.

  Next, the H-section steel 10 cut into the product length is conveyed to the cooling bed 4 by the conveyance line 9 and cooled to, for example, 200 ° C. or less. And the cooled H-section steel 10 is introduce | transduced into the curvature correction machine (not shown) by the conveyance line 9, and the curvature of the H-section steel 10 is corrected. For example, if a straightening machine using a roller is used as the warp straightening machine, it is possible to efficiently remove the warp of the H-section steel 10, so it is necessary to correct the warp before the cutting with the cutting machine 3. The nature is small. And the H-section steel 10 made into the product of a desired shape by correct | amending a curvature and curvature is conveyed by the conveyance line 9 at a shipping process.

The configuration of the hot rolling apparatus 1 is not particularly limited, but a general configuration can be adopted. For example, in the shape steel manufacturing facility shown in FIG. 1, the hot rolling apparatus 1 includes a rough rolling mill 1A, an intermediate rolling mill 1B, and a finishing rolling mill 1C. For example, a universal rolling mill can be suitably used as the finishing mill 1C. A steel material heated in a heating furnace (not shown) is conveyed by a conveying line 9 and introduced into the rough rolling mill 1A, the intermediate rolling mill 1B, and the finishing rolling mill 1C in this order, and sequentially hot rolled, thereby forming a long H shape. Steel is obtained.
Moreover, the cutting method in the cutting machine 3 is not particularly limited, and for example, saw cutting with a saw blade can be mentioned.

  Further, the straightening machine 2 uses a straightening machine that uses a roll to roll the flange in the longitudinal direction of the long H-shaped steel. That is, as shown in FIG. 3, the bending straightener 2 is arranged facing the surface of the flange 12 opposite to the web 11 (flange outer surface), and the direction of the roll shaft 21 a is the flange width direction, An outer surface roll 21 that supports the flange 12 from the outer surface side of the flange on the outer peripheral surface of the roll, and a surface on the web 11 side (flange inner surface) of the flange 12 are arranged opposite to each other, and the direction of the roll shaft 22a is the flange width direction. The flange portions 12a and 12b projecting perpendicularly to the height direction of the web 11 from the end in the height direction of the web 11 to the one surface side and the other surface side of the web 11 are respectively pressed by the outer peripheral surface of the roll. A pair of inner surface rolls 22, 22.

  If the flange 12 inside the curvature radius direction is sandwiched between the outer surface roll 21 and the inner surface rolls 22 and 22 and rolled under predetermined rolling conditions, the flange outer surface is stretched, so that the long H-shaped steel is bent. It will be corrected. In such bending correction by flange rolling, correction can be performed while conveying the H-shaped steel in the longitudinal direction, so that, for example, the time required for correction is shorter than that of a correction apparatus using a press, and correction is performed over the entire length. It is also possible.

The shape of each roll 21 and 22 used for the bending straightener 2 of this embodiment is not limited to what is shown in FIG. For example, you may give arbitrary distribution to the roll diameter of each roll 21 and 22 which rolls the flange 12. FIG.
In addition, there are various patterns in the bend generated in the long H-shaped steel, and a bent shape pattern in which the entire region in the longitudinal direction is bent, or only a part of the region in the longitudinal direction (for example, only the end portion). There is a bent shape pattern in which a bend occurs. In addition, there are a bent shape pattern (dish shape, inverted plate shape) in which only one direction of bending occurs, and a bent shape pattern (S shape) in which a bending in two directions occurs. Further, the amount of bending differs in any bent shape pattern.

  In the bend straightening machine 2, bend straightening is performed in accordance with the longitudinal direction region, the bend direction, and the amount of bend in which the long H-shaped steel is bent. That is, rolling conditions such as the longitudinal direction area where rolling is performed, the rolling reduction or the rolling load are sequentially changed according to the longitudinal direction area where the bending occurs, the bending direction, and the amount of bending. Therefore, no rolling is applied to the longitudinal region where no bending occurs, and no rolling is applied to the flange 12 on the outer side in the curvature radius direction of the bending even if bending occurs.

  For example, when the bent pattern is S-shaped, it is necessary to hot-roll both flanges 12 and 12, so that the bend straightening machine 2 has the flange 12 as shown in FIGS. It is preferable that the outer surface roll 21 and the inner surface rolls 22 and 22 for rolling are respectively provided (that is, it is preferable that two sets of the outer surface roll 21 and the inner surface rolls 22 and 22 are provided).

  In the case of the bend straightening machine 2 provided with one set of the outer roll 21 and the inner rolls 22, 22, it is necessary to roll the long H-shaped steel after rolling one flange 12 and roll the other flange 12. is there. Therefore, the bend straightening machine 2 needs to be provided with a turning device for turning a long H-shaped steel. For turning the long H-section steel, it may be turned 180 ° (turned over) with the central axis along the longitudinal direction of the long H-section steel as the rotation axis, or the central axis perpendicular to the web surface is the rotation axis. It may be rotated 180 degrees (turning).

  Alternatively, the other flange 12 may be rolled by moving the outer roll 21 and the inner rolls 22 and 22 after rolling one flange 12 without rolling the long H-shaped steel. In this case, the bend straightening machine 2 needs to be provided with a mechanism capable of rolling the flange 12 selected according to the bending direction with the outer roll 21 and the inner rolls 22 and 22.

Further, the postures of the long H-shaped steel and the cut short H-shaped steel 10 in the shape steel manufacturing facility are not particularly limited, and the web 11 is horizontal and the flanges 12 and 12 are vertical. It can also be set to H attitude | position, and it can also be set as the attitude | position (what is called I attitude | position) which the web 11 becomes vertical and the flanges 12 and 12 make horizontal.
When the posture of the long H-shaped steel in the bend straightening machine 2 is the H position, the roll shafts 21a and 21b of the outer roll 21 and the inner roll 22 in the bend straightening machine 2 are installed vertically as shown in FIG. In the case of the I posture, the roll shafts 21a and 21b of the outer roll 21 and the inner roll 22 are installed horizontally in the bending straightener 2.

However, since the hot rolling apparatus 1 often rolls in the H posture, the bend straightening machine 2 can perform rolling on the long H-shaped steel flange 12 in the H posture. It is preferable. Then, between the hot rolling apparatus 1 and the straightening machine 2, the posture is changed by turning the long H-shaped steel 90 ° around the central axis along the longitudinal direction of the long H-shaped steel. Since it is not necessary to carry out, conveyance time can be shortened.
In the shape steel manufacturing facility of the present embodiment as described above, as shown in FIGS. 1 and 2, the bending straightener 2 is arranged between the hot rolling device 1 (finishing mill 1 C) and the cutting machine 3. As a result, the H-section steel 10 with the curvature removed and straightened can be manufactured efficiently and at low cost. The reason will be described in detail below.

Correcting the bending of the long H-shaped steel produced by the hot rolling device 1 before cutting is because the straightening of the long H-shaped steel 10 individually corrects the short H-shaped steel 10 after cutting. This is because the time required to correct the bending can be shortened. The material passing speed when the H-section steel passes through the bending straightening machine 2 is often slow at the tip and tail ends of the H-section steel and fast at the stationary part (intermediate part). Further, when the end portion of the H-shaped steel is caught between the rolls 21 and 22 of the bending straightening machine 2, alignment for guiding the H-shaped steel to the center of the bending straightening machine 2 is necessary. Under these circumstances, the length of the H-section steel to be corrected is shorter and the number of H-section steels to be corrected is larger, the time required for the bending correction becomes significantly longer. Therefore, if the bend correction of the H-section steel is performed in a long state before cutting, the time required for the bend correction can be dramatically shortened.
Moreover, since the long H-section steel manufactured with the hot rolling apparatus 1 is in a high temperature state, it can give a relatively large deformation even with a small rolling load. Therefore, since the load resistance required for the bending straightener 2 can be reduced, the equipment cost can be reduced.

  Next, a more preferred modification of the above embodiment will be described. When bending correction is performed by the bending corrector 2, the longitudinal direction region where the bending occurs, the bending direction, the bending amount, and the like are measured in advance by the bending measuring device 5, and the bending correction is performed based on the measurement result. It is more preferable. For this purpose, it is preferable that a bending measuring device 5 is arranged between the hot rolling device 1 and the bending straightener 2 as the manufacturing equipment for the shape steel. This is because it is possible to measure the bending state of the shaped steel formed by the hot rolling apparatus 1 online, and to send the shaped steel after measuring the bending to the bending straightening machine 2 without back feeding online. is there.

  That is, as shown in FIG. 4, a bending measuring device 5 is installed between the finishing mill 1 </ b> C and the bending straightening machine 2, and the bending of the long H-shaped steel manufactured by hot rolling is performed by the bending measuring device 5. taking measurement. Then, the measurement result is transmitted to the bend straightening machine 2, and based on the measurement result, the rolling condition such as the longitudinal direction area where the rolling is performed, the rolling reduction or the rolling load is set in the bend straightening machine 2. In this way, by performing bend correction based on the measurement result of the bend measurement device 5, bend correction can be performed under more appropriate conditions, and therefore, the H-section steel 10 with higher dimensional accuracy is manufactured. Can do.

  Here, the method of measuring the bending in the bending measuring device 5 is not particularly limited, and for example, a method using a laser distance meter can be mentioned. As a method of using a laser distance meter, a laser distance meter is installed on the side of the conveyance line 9 so as to face the flange of the H-shaped steel, and the flange of the H-shaped steel and the laser distance meter are conveyed while conveying the H-shaped steel. The distance between the two is measured for each position in the longitudinal direction of the H-section steel, and the bending state in the longitudinal direction of the H-section steel is measured, or a plurality of laser distance meters are opposed to the flange along the conveying line 9 In the state where the H-shaped steel is stopped, the distance between the flange of the H-shaped steel and the laser rangefinder is measured at each position in the longitudinal direction of the H-shaped steel, and the bending condition in the longitudinal direction of the H-shaped steel. A method of measuring

  In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. For example, the size of the H-section steel to which the present invention can be applied is not particularly limited, and can be applied to any size H-section steel such as large and small. Moreover, in this embodiment, although the H-shaped steel was taken as an example and the shape steel manufacturing equipment and the shape steel manufacturing method were described, the present invention can be applied to a shape steel having a web and a flange. Is possible.

〔Example〕
The present invention will be described more specifically with reference to the following examples. 1 and 2, the first embodiment in which a H-section steel having a web height H of 600 mm, a flange width B of 300 mm, a web thickness t1 of 16 mm, and a flange thickness t2 of 22 mm was manufactured using the section steel manufacturing equipment shown in FIGS. Will be described. First, a steel material was hot-rolled using a hot rolling device to produce a long H-shaped steel. Since the obtained long H-shaped steel was bent, light bending was applied to the inner radius of the bending radius of 10 m from the tip of the long H-shaped steel using a bending straightener. The bend was corrected by extending the outer surface of the flange. As a result, the amount of bending of the long H-shaped steel could be greatly reduced.

  The long H-shaped steel whose curvature was corrected was cut at a position 10 m from the tip using a cutting machine, and cooled to room temperature on a cooling bed. After cooling, the warp of a short H-shaped steel was corrected with a warp straightening machine using a roller, and the amount of bending and the amount of warpage were measured. As a result, both were corrected to within 10 mm or less.

Next, a description will be given of a second embodiment in which an H-section steel having the same dimensions as described above is manufactured using the section steel manufacturing facility shown in FIG.
First, a steel material was hot-rolled using a hot rolling device to produce a long H-shaped steel. Since the obtained long H-shaped steel was bent, the longitudinal region where the bending occurred, the bending direction, and the amount of bending were measured by a bending measuring device. As a result, the longitudinal region from the tip to a position of 12 m was bent, and the bending amount of this longitudinal region was 23 mm.

  Therefore, using a straightening machine, rolling was performed on the inner flange in the radius direction of curvature over a length of 12 m from the tip of the long H-shaped steel, and the outer surface of the flange was stretched to correct the bending. The rolling load was set to 40 tons based on the data indicating the relationship between the bending amount and the appropriate rolling load investigated in advance. As a result of this bending correction, the bending amount of the long H-shaped steel could be greatly reduced.

  The long H-shaped steel whose curvature was corrected was cut at a position 12 m from the tip using a cutting machine, and cooled to room temperature on a cooling bed. After cooling, the warp of a short H-section steel was corrected with a warp straightening machine using a roller, and the bending and warpage were measured. As a result, the bending amount over the entire length was 8 mm, and the dimensional tolerance was corrected to 12 mm or less. On the other hand, the amount of warpage has been reduced from 15 mm outside the dimensional tolerance to 6 mm by roller correction. Thus, both bending and warping could be corrected within dimensional tolerances.

Next, a description will be given of a comparative example in which an H-shaped steel having the same dimensions as described above is manufactured without using the straightening machine 2 but using the straightening machine 2 shown in FIGS.
First, a steel material was hot-rolled using a hot rolling device to produce a long H-shaped steel. And it cut | disconnected in the position of 12 m from the front-end | tip using the cutting machine, and cooled to room temperature with the cooling bed. After cooling, the warp of a short H-shaped steel was corrected with a warp straightening machine using a roller, and the amount of bending and the amount of warpage were measured. As a result, the amount of warpage was 7 mm, which was within the range of the dimensional tolerance. However, since the amount of bending was 17 mm and was outside the dimensional tolerance, additional press correction was required.
As described above, according to the structural steel manufacturing equipment and the structural steel manufacturing method of the present invention, it is possible to efficiently correct the bending of the structural steel, and to efficiently manufacture the structural steel with good dimensional accuracy. It was possible.

DESCRIPTION OF SYMBOLS 1 Hot rolling apparatus 1A Rough rolling mill 1B Intermediate rolling mill 1C Finish rolling mill 2 Bending straightener 3 Cutting machine 5 Bending measuring apparatus 10 H-section steel 11 Web 12 Flange 21 Outer roll 22 Inner roll

Claims (4)

  A shape steel manufacturing facility for manufacturing a shape steel having a web and a flange, a hot rolling apparatus for forming a steel material into a long shape steel having a predetermined cross-sectional shape having the web and the flange, and the flange A bending straightening machine that corrects the bending of the long shaped steel and a cutting machine that cuts the long shaped steel, and the conveying direction of the steel material or the shaped steel in the manufacturing facility From the upstream side to the downstream side, the hot-rolling apparatus, the bend straightening machine, and the cutting machine are arranged in this order, and the shaped steel manufacturing equipment is characterized in that   The equipment for manufacturing a section steel according to claim 1, further comprising a bending measuring device for measuring the bending of the long shaped steel between the hot rolling apparatus and the bend straightening machine.   A method for manufacturing a shape steel having a web and a flange having a flange, wherein the steel material is hot-rolled and formed into a long shape steel having a predetermined cross-sectional shape having the web and the flange. A method for producing a shaped steel, comprising: rolling a flange of a long shaped steel to correct bending of the long shaped steel, and then cutting the long shaped steel.   The method for producing a shape steel according to claim 3, wherein the bending of the long shape steel is measured after the forming, and the correction is performed based on the measurement result of the bending.

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