JPH06297002A - Method for rolling wide flange shape - Google Patents

Abstract

(57) [Summary] [Objective] To provide a rolling method of H-section steel capable of reducing the number of rolls possessed, eliminating the need for roll recomposition, and improving the product yield. [Structure] A body rolling mill for rolling an H-shaped web portion is installed between a rough universal rolling mill for roughly rolling an H-shaped material to be rolled and an edger rolling mill for rolling an H-shaped edge portion. At the same time, a finishing universal rolling machine for finishing rolling into an H shape is arranged behind the edger rolling mill, and each of the horizontal rolls of the rough universal rolling mill, the edger rolling mill and the finishing rolling mill is divided into two in the width direction, and the control signal is supplied. The outer width of each horizontal roll is set to a predetermined value before the material to be rolled is bitten, and the rough universal rolling machine, body rolling mill and edger are used. After 3 tandem reverse rolling with a rolling mill, 1 pass rolling with a finishing universal rolling mill.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rolling H-section steel.

[0002]

2. Description of the Related Art Generally, rolling equipment for H-section steel is shown in FIG.
As shown in, a rough universal rolling machine 10 for roughly rolling the material 1 to be rolled into an H shape, an edger rolling machine 20 for rolling an edge portion of the H shape, and a finish universal rolling machine 30 for finish rolling to an H shape. Is equipped with.

In this case, as shown in FIG. 2 (b), the rough universal rolling mill 10 has a pair of horizontal rolls 11 forming a web portion on the outer peripheral surface and flange portions on both end surfaces, and a pair of horizontal rolls on the outer peripheral surface. And a pair of vertical rolls 12 forming a flange portion. As shown in FIG. 2 (c), the edger rolling machine 20 has a pair of horizontal rolls 21 for forming the edge of the flange portion with the outer peripheral surface of the end portion whose diameter is reduced. Also,
As shown in Fig. 2 (d), the finishing universal rolling mill 30 has two pairs of horizontal rolls divided in the height direction of the web portion in order to raise the flange portion and adjust the height of the web portion.
31A, 31B and a pair of vertical rolls 32 that raise the flange
And have.

The material to be rolled 1 is a rough universal rolling machine 10
And the edger rolling machine 20 perform reciprocating rolling a plurality of times, that is, 2 tandem reverse rolling, and then, in the final pass, the finishing universal rolling machine 30 rolls to a product shape.

As is well known, there are various H-section steels having different dimensions of the web portion. In this case, since the horizontal widths of the horizontal rolls 11 and 21 of the rough universal rolling mill 10 and the edger rolling mill 20 are fixed, the horizontal rolls of the finishing universal rolling mill 30 are divided into two, 31A and 31B. In order to reduce the height, the outer width of the horizontal rolls 31A and 31B is adjusted to the height of the web, and the mutual interval of the vertical rolls 32 is shortened to perform continuous rolling, that is, so-called running change rolling. This is called a partial reduction rolling method.

On the other hand, in order to increase the height of the web portion, as shown in FIG. 3 (a), a widening rolling mill 40 is installed between the edger rolling mill 20 and the finishing universal rolling mill 30, and the rough universal rolling mill is installed. The material to be rolled 1 is subjected to 2 tandem reverse rolling by the rolling mill 10 and the edger rolling mill 20, and then the widening rolling mill
The web portion is enlarged by 40, and further, finish universal rolling mill 30 finish-rolls it into an H shape.

In this case, the rough universal rolling mill 10 performs rough rolling by the horizontal rolls 11 and the vertical rolls 12 as shown in FIG. 3 (b), and the edger rolling mill 20 as shown in FIG. 3 (c). The H-shaped edge is rolled by the horizontal roll 21. Further, as shown in FIG. 3 (d), the widening rolling mill 40 has a shape of a truncated cone corresponding to the inclination of the web portion, and two pairs of horizontal rolls 41A and 41B divided in the height direction of the web portion. have. The horizontal rolls 41A and 41B are installed with their axes inclined at a certain angle in the longitudinal direction of the material to be rolled, and increase the height of the web portion without affecting the shape of the flange portion. Then, the finishing universal rolling mill 30 uses the horizontal roll 31A, the material to be rolled with the height of the web portion expanded,
31B and vertical roll 32 finish to the specified dimensions. This is called a widening rolling method.

[0008]

In both the partial reduction rolling method and the widening rolling method described above, since the rolling must be performed within a range in which buckling or wall thinning of the web portion does not occur, the height of the web portion cannot be increased. The variable range was narrow.

Therefore, in order to obtain products of various sizes and different sizes, it was necessary to replace the horizontal rolls of different sizes in the rough universal rolling machine 10 and the edger rolling machine 20.

However, in the conventional rolling method for H-section steel, a large number of rolls having different sizes must be held, the rolls must be frequently recombined, and the product yield is lowered. there were.

The present invention has been made to solve the above problems, and can reduce the number of rolls held, and
It is an object of the present invention to provide a rolling method for H-section steel that can improve the product yield while eliminating the need for roll combination.

[0012]

According to the present invention, the material to be rolled is H
Between the rough universal rolling machine for rough rolling into the shape and the edger rolling machine for rolling the edge portion of the H shape, the body rolling mill for rolling the H-shaped web portion is installed, and at the rear of the edger rolling machine. A finishing universal rolling machine for finishing rolling in H shape is arranged, and each of the horizontal rolls of the rough universal rolling machine, the edger rolling machine and the finishing rolling machine is divided into two in the width direction, and the outer width dimension can be adjusted by the control signal. Before the biting of the material to be rolled, the outer width of each horizontal roll is set to a predetermined value, and 3 tandem reverse rolling is performed by a rough universal rolling mill, a body rolling mill and an edger rolling mill. After that, it is rolled in one pass by a finishing universal rolling mill.

[0013]

The present invention can be applied to any size H-section steel if the height of the web can be changed at the time of tandem reverse rolling with the rough universal rolling mill and the edger rolling mill. And, as each horizontal roll of the edger rolling mill, one that is divided into two in the width direction and whose outer width dimension can be adjusted by a control signal is used, and before the biting of the material to be rolled, the outer width of each horizontal roll Is set. In this case, if a horizontal roll divided into two is used, a thickening portion is generated between the rolls separated in the axial direction. Therefore, a widening rolling mill is installed between the rough universal rolling mill and the edger rolling mill to increase the thickness. The generation of meat is suppressed.

[0014]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows the rolling process and the roll shape thereof according to the present invention, and those denoted by the same reference numerals as those in FIG. 2 respectively show the same elements.

Here, the equipment configuration differs from that shown in FIG. 2 in that, as shown in FIG. 1 (a), a body rolling machine 50 is installed between the rough universal rolling machine 10 and the edger rolling machine 20. There is. Further, as shown in FIG. 1 (b), the rough universal rolling mill 10 is divided into two in the width direction and is equipped with two pairs of horizontal rolls 11A and 11B whose outer width dimensions can be adjusted by a control signal. The machine 20 is also different from that of FIG. 2 in that, as shown in FIG. 1 (d), it is divided into two in the width direction and has two pairs of horizontal rolls 21A and 21B whose outer width can be adjusted by a control signal. ing. In addition, as shown in FIG. 1 (c), the body rolling mill 50 is
As shown in FIG. 1 (e), the finishing universal rolling mill 30 is provided with the cylindrical horizontal rolls 51 and the horizontal rolls 31A and 31B and the vertical rolls 32 which are exactly the same as those described above.

When rolling H-section steel, the optimum shape after tandem reverse rolling in the rough universal rolling mill 10 and the edger rolling mill 20 can be predicted according to the final product size. Therefore, in the present embodiment, the outer width dimension of each horizontal roll divided into two in the width direction is determined in advance for each pass, and the reduction amount of the horizontal roll 51 of the cylinder rolling mill 50 is also determined for each pass. Every time, the width and the reduction amount of these rolls are set online before starting the rolling, and then the rolling is started. Then, at the same time when the material to be rolled 1 passes through the body rolling mill 50, the outer width dimension of the horizontal roll and the roll reduction amount are reset to the values of the next pass and rolled.

As described above, the outer width dimension and the reduction amount of each horizontal roll are determined for each pass, and the outer width dimension and the reduction amount are set again for each rolling of one pass. 3 tandem reverse rolling is possible for all types of H-section steels with different heights. The body-rolling mill 50 removes the thickened portion 2 generated between the horizontal rolls 11A and 11B having variable widths.

As described above, the material 1 to be rolled which has been subjected to the three tandem reverse rolling is rolled into the final product shape by the finishing universal rolling machine 30 having a variable roll width in the final pass.

Incidentally, in the final pass, the outer width dimensions of the horizontal rolls 11A and 11B of the rough universal rolling mill 10 and the outer width dimensions of the horizontal rolls 31A and 31B of the finishing universal rolling mill 30 become the same.

[0021]

As is apparent from the above description, according to the present invention, each horizontal roll of the rough universal rolling mill and the edger rolling mill is divided into two in the width direction, and the outer width dimension is adjusted by the control signal. It is possible to set the outer width of each horizontal roll to a predetermined value before biting the material to be rolled, so it is possible to reduce the number of rolls owned and it is not necessary to reassemble the rolls. In addition, the product yield can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view for explaining a rolling process, a rolling roll and a rolling shape according to the present invention.

FIG. 2 is an explanatory view for explaining a rolling roll and a rolling shape according to a conventional H-section steel rolling method.

FIG. 3 is an explanatory view for explaining a rolling roll and a rolling shape according to another conventional H-section steel rolling method.

[Explanation of symbols]

 10 Rough Universal Rolling Machine 11A, 11B Horizontal Roll 12 Vertical Roll 20 Edger Rolling Machine 21A, 21B Horizontal Roll 30 Finishing Universal Rolling Machine 31A, 31B Horizontal Roll 32 Vertical Roll 50 Cylinder Rolling Machine 51 Horizontal Roll

Claims (1)

[Claims] 1. A body rolling mill for rolling an H-shaped web portion between a rough universal rolling mill for roughly rolling an H-shaped material to be rolled and an edger rolling mill for rolling an H-shaped edge portion. At the same time as the installation, a finishing universal rolling mill for finishing rolling into an H shape is arranged behind the edger rolling mill, and each of the horizontal rolls of the rough universal rolling mill, the edger rolling mill and the finishing rolling mill is divided into two in the width direction. The outer width of each of the horizontal rolls is set to a predetermined value before the material to be rolled is caught, and the rough universal rolling mill is used. A method for rolling H-section steel, comprising performing 3 tandem reverse rolling with a body rolling mill and an edger rolling mill, and then performing 1 pass rolling with the finishing universal rolling mill.