JPH01309701A - Rolling method for h-shaped steel - Google Patents

Abstract

PURPOSE:To roll H-shaped steels of many sizes without exchanging rolls by constituting the horizontal rolls of a universal roughing mill to divided rolls movable in the axial direction of the rolls and subjecting the web part to partial rolling while changing the positions of the intermediate divided rolls at every pass. CONSTITUTION:The left side divided rolls 21 and the right side divided rolls 2 are previously so fixed as to attain a prescribed roll width and the intermediate divided rolls 23 are moved to the left and are brought into tight contact with the left side divided rolls 21 in the first pass, then the web of a stock 7 is partially rolled. Namely, rolled parts 7 and an unrolled part 72 are formed to the web. Flange parts 73 are then rolled by the left and right divided rolls 21, 22 and vertical rolls 25, 25. The rolls 23 are then moved to the right side and are brought into tight contact with the right end divided rolls 22 and the web is partially rolled. The flange parts 73 are rolled by the rolls 21, 22 and the rolls 25, 25. The rolling of the web and the flanges is executed by repeating the above-mentioned state several times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for rolling H-section steel of various sizes without changing rolls.

[Prior art] - When hot-rolling an H-shaped steel, as shown in the rolling process diagram in FIG. The product is then rolled into an H-beam steel product by rolling multiple passes using a rough universal rolling mill 2 and an edger rolling mill 3, followed by one pass rolling using a finishing universal rolling mill 4.

Figures 4 (A), (B), and (C) respectively show the rolling process of the raw material in the universal rolling mill vU2, edge rolling mill 3, and finishing rolling mill 4. The horizontal roll dimensions of the rolling mill and finishing universal rolling mill are determined.

In other words, the web internal normal heights (a), (b), (
c) are rolled so that they are approximately equal. Therefore,
It was necessary to replace the horizontal rolls every time the web dimensions of the product changed.Normally, H-beams are rolled in small quantities in multiple sizes.
The rolls are frequently replaced, and it takes 25 to 30 minutes to replace the rolls twice, which leads to a decrease in the operating rate. Further, it is necessary to have rolls for each rolling mill for each size, which poses a problem that the number of rolls to be held increases.

In order to solve these problems, there is a rolling method using split rolls as disclosed in JP-A-61-137601 and JP-A-61-283401.

These methods involve disposing a primary roughing universal rolling mill 5 and a secondary roughing universal rolling mill 6 before and after an edger rolling mill 3, as shown in FIG.
, 6 are divided and made movable in the axial direction of the rolls, and the web is partially rolled by the horizontal rolls of the primary rough universal rolling mill 5 as shown in FIG. 6(A). As shown in FIG. 6(C), the web is partially rolled using horizontal rolls including the unrolled portion of the web in the primary rough universal rolling mill. Here, Fig. 6 (B) is produced by rolling the sixth
Figure (D) shows the rolling process by the finishing universal rolling mill.

[Problems to be Solved by the Invention] However, in order to implement the conventional method, two universal rolling mills are required, and moreover, they must be installed close to each other in order to prevent the temperature of the steel billet from decreasing. Also,
A rolling mill arrangement having two rough universal rolling mills in close proximity to each other is not necessarily common, and this method cannot be applied to a factory with a rolling mill arrangement having only one rough universal rolling mill.

[Means for Solving the Problems] This invention attempts to solve the above-mentioned problems, and it is an object of the present invention to solve the above-mentioned problems by making it possible to move the horizontal rolls of a rough universal rolling mill in the direction of the roll axis when manufacturing H-section steel. This is a rolling method for an H-section steel, which is characterized in that the web is configured with three or more split rolls, and the position of the intermediate split roll is changed every pass to repeat partial rolling of the web.

Effect] The effect of the method of the present invention will be explained in the case of a three-part roll. In this case, it is composed of a left end split roll, a right end split roll, and a middle split roll. First, fix the left-most divided roll and the right-most divided roll so that they have a predetermined roll width, and in the first pass, move the middle divided roll to the left so that it is in close contact with the left-most divided roll, and then press the horizontally divided roll. rolling the web of material in sections. That is, the part of the material between the right-most split roll and the middle split roll becomes an unrolled part, and the other parts of the material become a rolled part. and,
The flange is rolled with each split roll and vertical rolls on both sides. In the next pass, the intermediate split roll is moved to the right and brought into close contact with the right end split roll, and the horizontal split roll rolls the unrolled part in the previous pass, and the material between the left end split roll and the intermediate roll is rolled. The part becomes the unrolled part. Then, the flange portion is rolled by each divided roll and both vertical rolls.

By repeating partial rolling by moving the intermediate roll left and right in this manner, the web and flange of the material are rolled. If the roll width of the left and right end rolls of the 3-part roll is 11, and the roll width of the intermediate roll is ρ2, the inner height of the web will vary from the minimum (2Jt+Jz) to the maximum (242,
H-beam steel in the range of +2ρ2) can be rolled with the same horizontally split rolls.

The reason why the horizontal roll is divided into three or more parts is because it is necessary to perform partial rolling of the web and rolling of the flange portion at the same time.

[Embodiments of the Invention] The method of the present invention will be explained below based on the drawings. FIGS. 1(A) and 1(B) are diagrams showing one roll configuration and rolling process of a rough universal rolling mill implementing the present invention. The horizontal roll is divided into a left end divided roll 21, an intermediate divided roll 23, and a right end divided roll 22, and these divided rolls are movable in the roll axis direction. And 25
is a vertical roll.

Next, a method of rolling an H-section steel material using the rolls configured as described above will be described. First, the left end split roll 21 and the right end split roll 22 are fixed so that they have a predetermined roll width, and in the first pass, the middle split roll 23 is moved to the left as shown in FIG. 1(A). and left end split roll 2
1, and partially roll the web of material 7 using horizontally split rolls. That is, the web has a rolled part 71 and an unrolled part 7.
2 is formed. Next, as shown in FIG. 1(B), the intermediate dividing roll 23 is moved to the right end, and the right end dividing roll 22 is rolled. The web is partially rolled. The previous unrolled portion 72 is rolled by this partial rolling, and a part of the web rolled last time becomes the unrolled portion.

Then, left and right divided rolls 21.22 and vertical rolls 25.2
5, the flange portion 73 is rolled. Below, (A> and (B)
The web and flange are rolled by repeating the process several times.In this way, if the horizontal roll is divided into three parts, and the roll width of the left and right divided roll is pl, and the roll width of the intermediate divided roll is g2, the web is The inner height is the minimum (2η10ρ
2) to a maximum of (2ρ1+2ρ2) H-beams can be rolled with the same horizontally split rolls. For example, f+=150m
m, ρ2 = 300mm, the internal height of the web that can be rolled is 600 to 900mm, H700X300 (web internal height 652m+++)
.

) (800X300 (web inner height 748mm).

H900X300 (web inner height 844mm)
Shaped steel can be rolled.

FIG. 2 is another embodiment diagram showing another roll configuration and rolling process of a rough universal rolling mill embodying the present invention. This embodiment is an example of a four-split horizontal roll with two middle split rolls 23 and 24, and left and right split rolls 21.2 and 24.
2 is fixed at a predetermined roll width, and the intermediate divided rolls are moved left and right to repeat partial rolling of the web several times to roll the web and flange. The use of a four-divided horizontal roll has the advantage that the unrolled portion 72 can be made bilaterally symmetrical, and bending of the material in the length direction during rolling is less than in the case of a three-divided horizontal roll.

The method of the present invention can be applied to a rolling mill arrangement including one rough universal rolling mill as shown in FIG. 3, and moreover, the number of horizontal rolls to be owned can be reduced.

[Effects of the Invention] Since the present invention is configured as described above, the rough universal rolling mill can be applied to a single rolling mill arrangement, and it is possible to roll H-section steel of multiple sizes without changing rolls. This has the effect of improving rolling efficiency and reducing the number of rolls owned.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one roll configuration and rolling process of a rough universal rolling mill implementing the present invention, FIG. 2 is a diagram showing another roll configuration and rolling process implementing the present invention, and FIG. 3 is a diagram showing a conventional rolling mill. Figure 4 is a diagram showing a conventional rolling process, Figure 5 is a diagram of a conventional rolling process with primary and secondary roughing universal rolling mills, and Figure 6 is a diagram showing a primary and secondary roughening process. It is a figure which shows the rolling process in the conventional rolling process which has a universal rolling mill. DESCRIPTION OF SYMBOLS 1... Breakdown rolling mill, 2... Rough universal rolling mill, 3... Edger rolling mill, 4... Finishing universal rolling mill, 21... Left end split roll, 22
...Right end divided roll, 23.24...Middle divided roll, 25...Vertical roll, 71...Rolling part, 72...
- Unrolled part, 73...flange.

Claims (1)

[Claims] When manufacturing H-section steel, the horizontal roll of a rough universal rolling mill is configured into three or more split rolls that can move in the roll axis direction, and the position of the middle split roll is changed for each pass to separate the parts of the web. H characterized by repeated rolling
Method of rolling section steel.