JPH09122758A - Method and equipment for straightening shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the straightening effect and the reducing effect of the residual stress by giving the slight rolling reduction function to a horizontal roller of a roller straightening machine, and straightening a work to be straightened through slight rolling reduction when the work is slightly reduced. SOLUTION: A work 20 to be straightened is straightened by a roller straightening machine 1. Rolls 3, 4 on the inlet side and rolls 10, 11 on the outlet side are provided with a roll pitch changing device so that the slight rolling reduction can be performed by moving an upper roll and a lower roll to approximately same position. Intermediate rolls 5-9 are located in a staggered manner. The rolls 3, 4, 10, 11 can be used in a staggered arrangement in a normal condition. When a work 20 to be straightened with large bend is straightened, the rolls 3, 4, 10, 11 are moved by the roll pitch changing device to set the upper and lower rolls opposite to each other to realize the arrangement of a slight rolling reduction mill. The large bend of the work 20 is straightened by the rolls 3, 4 on the inlet side, and further straightened by the repeated bend by the intermediate rolls 5-9 arranged in a staggered manner, and the whole work is straightened by the rolls 10, 11 on the outlet side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening method and apparatus for a shaped steel having a web and a flange in a shaped steel manufacturing facility, and more particularly, to a roller straightening machine having a light reduction rolling mill function. The present invention relates to a shaped steel straightening method and apparatus capable of straightening a shape including bending and reducing residual stress over the entire length of a material to be straightened.

[0002]

2. Description of the Related Art Shaped steel as it is manufactured by hot rolling causes bending in the length direction, defective cross-sectional shape and residual stress when cooled in a cooling bed. We have to solve such problems. Particularly, a shaped steel having a web and a flange, such as an H-shaped steel, is strongly required to improve the precision of the shape and reduce the residual stress. When correcting the bending and cross-sectional shape of shaped steel, generally, a roller straightening machine in which a plurality of horizontal rolls are arranged in a zigzag pattern is used, but with such a roller straightening machine alone, all of the bending and shape straightening can be performed. It cannot be solved and it is impossible to reduce the residual stress.

Therefore, in order to solve such a problem of the conventional roller straightening machine, a universal rolling machine is arranged for straightening instead of the conventional roller straightening machine, or the entrance side and the exit side of the roller straightening machine. There is a rolling mill installed in. For example, in Japanese Unexamined Patent Publication No. 52-45573, a universal rolling mill is arranged for straightening instead of a conventional roller straightening machine in the process of manufacturing a shaped steel by a universal rolling mill, and this universal rolling mill A method of manufacturing shaped steels is described which is intended to correct and reduce residual stress.

In Japanese Patent Laid-Open No. 59-209424, rolling straighteners are provided on the inlet side, outlet side, or both sides of the shaped steel roller straightening machine, and a flange of a steady portion of the shaped steel is formed by the shaped steel roller straightening machine. There is described a method of straightening a shaped steel, in which the web or both are repeatedly bent to straighten the bending of a steady portion and a rolling straightening machine is used to straighten the unsteady portion of the shaped steel. Further, in Japanese Patent Laid-Open No. 3-180209, a shaped steel having a web and a flange subjected to finish rolling is repeatedly bent by a leveler composed of a plurality of roll groups arranged along a rolling pass line, and then, A method of straightening a shaped steel is described, in which the web of the shaped steel is constrained vertically while a reduction is performed to reduce the height of the web.

[0005]

According to the inventions described in the above publications, the residual stress is reduced, the bending of the unsteady part is corrected, or the height of the web is corrected. The rolling mill has many advantages. However, if a universal rolling mill is installed in place of the roller straightening machine, or if a rolling mill is installed on the inlet side or the outlet side of the roller straightening machine, or on both sides, a large scale due to an increase in equipment costs, installation space, etc. It will be a straightening facility, and the number of rolls will increase, which will increase running costs.

The present invention has been made to solve the above problems, and by providing a function of a light reduction rolling mill in a roller straightening machine using straightening rolls, it is possible to bend the entire length of shaped steel with a small-scale facility. It is an object of the present invention to provide a method and an apparatus for straightening a shaped steel capable of straightening a shape and reducing residual stress.

[0007]

DISCLOSURE OF THE INVENTION As a result of research, the inventors of the present invention have found that shape reduction including bending of a structural steel having a web and a flange and reduction of residual stress can be achieved by light reduction rolling. I found it. The present invention has been made based on such knowledge. The method for straightening shaped steel according to the present invention is
A plurality of upper and lower horizontal rolls are arranged in a zigzag pattern and a roller straightening machine having vertical rolls on the inlet side and the outlet side is provided so that a light reduction rolling mill function can be imparted to the inlet side or the inlet and outlet side upper and lower horizontal rolls. According to the bending state of the material to be straightened, a function of a light rolling mill is applied to the horizontal rolls on the entrance side or the entrance side and the exit side to correct the material to be straightened.

The shaped steel straightening apparatus according to the present invention has a plurality of upper and lower horizontal rolls arranged in a zigzag pattern and has at least an inlet side and an outlet side of a roller straightening machine having vertical rolls on the inlet side and the outlet side. A roll pitch variable device is installed on the horizontal roll, and the horizontal roll on the inlet side or the inlet side and the outlet side is moved by the roll pitch variable device, and the upper and lower horizontal rolls on the inlet side or the inlet side and the outlet side are made to substantially face each other and lightly reduced. The rolling mill is arranged so that it can be arranged.

[0009]

1 is a schematic diagram of an embodiment of the present invention. In the figure, 1 is a roller straightening machine in which a plurality of horizontal rolls are arranged in a zigzag pattern, and 2 is its housing. The double-sided horizontal roll (which straightens the web of the material to be straightened) that constitutes the roller straightening machine is composed of split rolls, and the lower roll 3 and the upper roll 4, which can be a light pressure rolling mill arrangement I from the entrance side, are always staggered. A plurality of lower rolls 5, 7 and 9 and upper rolls 6 and 8 which are arranged in a zigzag shape to form a zigzag straightening machine II, a light rolling mill arrangement III on the exit side, and a lower roll 11 and an upper roll 10 which can be formed in this order. It is arranged. Although FIG. 1 shows the case where nine horizontal rolls are provided, the number is not limited to this, and the number can be appropriately increased or decreased.

The lower rolls 3, 5, 7, 9, 11 and the upper rolls 4, 6, 8, 10 are roll bearings 12, respectively.
Each roll bearing 12 is configured to be independently movable along the frame 2 in the inlet side direction or the outlet side direction of the roll straightener 1 by a roll pitch varying device (not shown). Has been done. Then, with this roll pitch varying device, the lower roll 3 and the upper roll 4 on the entrance side,
Further, by moving the lower roll 11 and the upper roll 10 on the delivery side to substantially the same position (positions that are substantially opposite to each other), the light rolling mill arrangements I and III can be obtained.

Further, each lower roll 3, 5, 7, 9, 11 is provided with a push-up device 13 for independently adjusting the roll gap with each upper roll 4, 6, 8, 10 respectively. In the embodiment, hydraulically, the lower rolls 3 and 11 can press the web of the material to be straightened up to 100 tons, and the other lower rolls 5, 7 and 9 can press up to 300 tons. Among these lower rolls 3, 5, 7, 9, 11 and upper rolls 4, 6, 8, 10, at least the lower roll 3 and the upper roll 4, which can be the light-side rolling mill arrangement I on the entry side, and the exit roll. It is desirable that the lower roll 11 and the upper roll 10, which can be arranged on the side light rolling mill arrangement III, be provided with a roll width varying device (not shown) for adjusting the interval between the split rolls.

Reference numerals 14a, 14b, 14c and 14d (only 14a and 14c are shown in FIG. 1) are a pair of vertical rolls for straightening the flange of the material to be straightened, and the first or second roll from the entrance side. Horizontal roll and exit side final or 2 from the end
It is installed on the second horizontal roll (upper roll 4
And 10 are shown), the pitch variable device moves in synchronization with the upper rolls 4, 10. The vertical rolls 14a, 14b, 14c, and 14d are horizontal rolls other than those described above (the lower roll 5, which constitutes the zigzag straightening machine II).
7, 9 and upper rolls 6, 8). And
Each vertical roll 14a, 14b, 14c, 14d is supported by a roll bearing 15 as shown in FIG.
The position of the material to be straightened is straightened by 6 to straighten the flange of the material to be straightened. In the embodiment, the pressing device 16 allows the flange of the material to be straightened to be pressed down to 100 tons from the outside. In addition, the lifting device 13 for the lower rolls 3 and 11 and the vertical roll 1 that can be arranged in the light rolling mills I and III.
It is desirable that the pressing devices 16 of 4a, 14b, 14c, and 14d be hydraulically operated to perform constant pressure control in terms of responsiveness and followability.

Reference numeral 20 denotes a material to be straightened which is conveyed in the direction of the arrow and is passed through the pass line of the roller straightening machine 1. In the figure, the case of straightening H-section steel is shown.
22a and 22b are flanges (see FIG. 3).

Next, H, which is the material to be straightened, is manufactured by hot rolling with the roller straightening machine configured as described above.
The function of straightening the shaped steel will be described. First, when the material to be straightened 20 has a small bend, as shown in FIGS. 2 and 3,
The lower roll 3 and the upper roll 4 on the entrance side of the roller straightening machine 1 are moved by the roll pitch varying device, and are made to face each other to a light reduction rolling mill arrangement I, which constitutes a light reduction rolling mill. Further, the roll width of the lower roll 3 and the upper roll 4 is adjusted by the roll width varying device according to the in-web normal size of the material to be straightened 20. When all the horizontal rolls are provided with a roll width varying device, the roll width of each horizontal roll is adjusted as described above. The horizontal rolls from the entry side onward are the zigzag arrangement including the lower roll 11 and the upper roll 10 on the exit side.

Then, the roll gaps of the lower rolls 5, 7, 9, 11 and the upper rolls 6, 8, 10 arranged in a zigzag pattern by the pushing-up device 13 corresponding to the web thickness of the material to be straightened 20 are formed. The vertical rolls 14a, 14b and 1 are adjusted according to the outer dimension of the material 20 to be straightened by the pressing device 16.
Adjust the roll spacing of 4c and 14d.

After setting the respective parts of the roller straightening machine as described above, when a material 20 to be straightened having a small bend is loaded from the entrance side, the material is bent by a light pressure rolling mill consisting of a lower roll 3 and an upper roll 4. Straightening and reduction of residual stress are performed, and subsequently, repeated bending is performed with a group of horizontal rolls arranged in a zigzag manner, the bending of the middle portion is corrected, and the entire material 20 to be straightened and residual stress are reduced. To do.

Next, in the case of straightening a material 20 to be straightened having a large bending, as shown in FIG. 4, the lower roll 3 and the upper roll 4 on the entrance side are moved by a roll pitch varying device so that they are substantially opposed to each other. In addition to the light reduction rolling mill arrangement I, the lower roll 11 and the upper roll 10 on the delivery side are moved so as to face each other to form the light reduction rolling mill arrangement III, and both the entry side and the exit side are light reduction rolling mills. . Then, the intermediate lower rolls 5, 7, 9 and the upper rolls 6, 8 are arranged in a staggered manner, and the lower rolls 5, 7, 9 are arranged.
The roll gap between the upper rolls 6 and 8 is adjusted, and the roll gap between the vertical rolls 14a, 14b and 14c, 14d is adjusted.

The material to be straightened 2 having a large bend from the entrance side
When 0 is loaded, the light rolling mill on the entry side consisting of the lower roll 3 and the upper roll 4 corrects large bends, straightens the leading and trailing edges, and reduces residual stress, and then staggered. Bending is repeatedly performed by a group of horizontal rolls arranged in the position to correct the bend in the middle portion. Finally, the light rolling mill on the delivery side, which is composed of the lower roll 11 and the upper roll 10, corrects the entire roll and reduces residual stress.

Next, with the roller straightener according to the present invention,
When straightening shaped steel that cannot be straightened with flat horizontal rolls (for example, steel sheet pile, equilateral angle steel, or irregular angle steel), arrange all horizontal rolls in a zigzag pattern and bend the material to be straightened repeatedly. To do. In this case, the horizontal roll reduction mechanism is controlled at a fixed position.

Example 1 Next, an H-section steel having a web height of 500 mm, a flange width of 200 mm and a small bend was formed by a roller straightening machine according to the present invention and a conventional roller straightening machine in which horizontal rolls are arranged in a staggered manner. The result of correction will be described. The straightening conditions are as shown in Table 1. As shown in FIG. 2, the lower roll 3 and the upper roll 4 on the inlet side are arranged in a light reduction rolling mill, and the lower rolls 5, 7, 9, 11 are arranged thereafter. The upper rolls 6, 8 and 10 are arranged in a staggered arrangement.

[0021]

[Table 1]

Tables 2 and 3 show the results of straightening the upper and lower bends and the left and right bends of the H-section steel (rolled material) having a product length of 12 m and a small bend under the above-mentioned straightening conditions.

[0023]

[Table 2]

[0024]

[Table 3]

Tables 4 and 5 show the results of straightening the upper and lower bends and the left and right bends of the H-section steel with a product length of 18 m and a small bend. Tables 6 and 7 show the results of the H-section steel with a product length of 20 m. Shown in.

[0026]

[Table 4]

[0027]

[Table 5]

[0028]

[Table 6]

[0029]

[Table 7]

As is clear from Tables 2 to 7, according to the present invention, the straightening effect can be remarkably improved as compared with the case where the H-section steel is straightened by the conventional apparatus. Further, as shown in FIG. 5, the residual stress was able to be significantly reduced as compared with the case where the residual stress was corrected by the conventional apparatus shown in FIG.

Example 2 Next, the result of straightening an H-section steel having the same product size as that of Example 1 and having a large bend will be described. The straightening conditions are as shown in Table 8 and, as shown in FIG. 4, the lower roll 3 and the upper roll 4 on the entrance side.
The lower roll 11 and the upper roll 10 on the delivery side are arranged in a light rolling mill, and the intermediate lower rolls 5, 7, 9 and the upper rolls 6, 8 are arranged in a zigzag pattern.

[0032]

[Table 8]

Each of the product lengths is 1 by the above-mentioned straightening condition.
Table 9 and Table 10, Table 11 and Table 12, and Table 13 and Table 14 show the results of correcting the vertical bending and the horizontal bending of the H-section steel having large bending at 2 m, 18 m, and 20 m.

[0034]

[Table 9]

[0035]

[Table 10]

[0036]

[Table 11]

[0037]

[Table 12]

[0038]

[Table 13]

[0039]

[Table 14]

As is clear from Tables 9 to 14, according to the present invention, even in the case of the H-section steel having a large bending, a remarkably excellent straightening effect is obtained as compared with the case of straightening with the conventional apparatus. . Also, with respect to the residual stress, the result as shown in FIG. 5 was obtained almost in the same manner as in Example 1.

[0041]

As described in detail above, the shaped steel straightening method and the straightening apparatus according to the present invention are configured such that the inlet side or the inlet side and the outlet side of the roller straightening machine can be arranged in a light rolling mill. Then
Depending on the bending state of the material to be rolled, the horizontal rolls on the inlet side or the inlet side and the outlet side are straightened as a light reduction rolling mill arrangement, so the straightening effect and the residual stress reduction effect are better than those of conventional straightening devices. It is possible to remarkably improve the shape steel with high dimensional accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention.

FIG. 2 is an operation explanatory view of FIG. 1;

FIG. 3 is a vertical cross-sectional view of the entrance side of FIG.

FIG. 4 is a diagram for explaining the operation of FIG.

FIG. 5 is an explanatory diagram showing a state in which residual stress is reduced according to the present invention.

FIG. 6 is an explanatory diagram showing a state in which residual stress is reduced by a conventional roller straightening machine.

[Explanation of symbols]

 1 Roller straightening machine 3,11 Lower roll that can be arranged with a light rolling mill 4,10 Upper roll that can be arranged with a light rolling mill 5,7,9 Lower roll 6,8 Upper roll 12,15 Roll bearing 13 Push up Device 14a-14d Vertical roll 16 Pressing device 20 Corrected material 21 Web 21a, 21b Flange

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Miyazato 1-2, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Makoto Watanabe 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd. (72) Inventor Kiyoo Omori 1-2, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Keiji Takagi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Inside Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. In a straightening process for a shaped steel for straightening a shape including bending of a material to be straightened and reducing residual stress, a plurality of upper and lower horizontal rolls are arranged in a zigzag pattern and vertical rolls are provided on an inlet side and an outlet side. A roller straightening machine having a configuration such that a light rolling mill function can be imparted to the upper and lower horizontal rolls on the entry side or the entry side and the exit side, and the entry side or the entry side depending on the bending state of the material to be straightened. A straightening method for a shaped steel, which comprises imparting a function of a light rolling mill to a horizontal roll on the delivery side to straighten the material to be straightened. 2. A straightening device for a shaped steel for straightening a shape including bending of a material to be straightened and reducing residual stress, wherein a plurality of upper and lower horizontal rolls are arranged in a zigzag pattern and vertical rolls are provided on an inlet side and an outlet side. A roller straightening device having a roll pitch variable device on at least the inlet and outlet horizontal rolls,
With the roll pitch varying device, the horizontal rolls on the inlet side or the inlet side and the outlet side are moved, and the upper and lower horizontal rolls on the inlet side or the inlet side and the outlet side are substantially opposed to each other so that a light rolling mill can be arranged. Shaped steel straightening device characterized by being configured as described above.