JPS6178501A - Manufacture of h-beam - Google Patents

Abstract

PURPOSE:To manufacture an H-beam excellent in the shape of its flange front- end by using plural edging rolls, having different front-end forming parts respectively, and forming the inner-surface side of a flange front-end larger in height than the outer-surface side thereof at the first half pass and subjecting the flange front-end to rolling reduction approximately perpendicularly at the latter half pass. CONSTITUTION:In an H-beam rolling line consisting of a break down mill 1, a group 2' of roughing universal mills and a finishing universal mill 3, etc.; an edging mill A5a, having an included angle theta of about 90 deg. between the rolling- reduction surface 21 of the flange front-end of an edging roll 13 and the corresponding surface 22 of the flange inner-surface, and an edging mill B5b, having said included angle theta of 85-89 deg., are arranged at the front and back of an universal mill 4 of said group 2' of roughing universal mills. A rough H-beam billet formed by the mill 1, is rolled only by the mill B5b at the first half pass of rolling of the group 2', to form the inner surface-side of the front-end of flange larger in height than its outer-surface side, and the billet is rolled only by the mill A5a at the latter half of pass to flatten the front end of flange, before finish rolling it.

Description

[Detailed Description of the Invention] [Object of the Invention] Industrial Application Field The present invention relates to a method for manufacturing H-beam steel, and more specifically, it relates to a method for manufacturing H-section steel, and more specifically, a method for manufacturing H-beam steel, in which two or more sets of edger rolls with different shapes of flange end shaping portions are used. The present invention relates to a method of manufacturing a product with an excellent shape of a flange tip.

Conventional technology In general, H-section steel is manufactured by a universal rolling mill train as shown in FIG. This rolling mill train consists of a breakdown mill 1, a rough universal mill group 2, and a finishing universal mill 3, and the rough universal mill group 2 consists of a universal mill 4 and an edger mill 5.

In the breakdown mill 1, a rough shaped steel piece 6 of the shape 1 (as shown in Fig. 6) is rolled, and this is rolled into a rough universal mill 8.
Sent to 2. In the universal mill 4, as shown in FIG. 7, upper and lower horizontal rolls h. At the same time the wear part 7 is rolled down by the horizontal roll h'. Side ha of h′, h8′
The flange part 8.8' is rolled down by the vertical rolls 12.12' and 12.12'.

[10. In the edger mill 5, which is installed close to the one-wheel versal mill 4, upper and lower rolls 13.
13', the end of the flange 8 is rolled down. Rolling at the mouth is performed by sequentially narrowing the O-ru gap 8 in each pass.
After rolling the material to the specified web thickness and flange thickness, it is sent to the finishing universal mill 3, where the wear part is lightly rolled down with horizontal rolls and the flange part is rolled at the same time. 1L with a vertical roll
jl Pressure shaping and rolling is completed.

By the way, in the above-mentioned conventional rolling method, when the flange end is shaped and rolled by the upper and lower rolls 13.13 of the edger mill, the outer surface 10 of the flange end of the material is not restrained from deforming, so as shown in FIG. It protrudes with a bare, S, and dimple 10 corresponding to the reduction m of the flange tip. Yes
Since the inner corner 9 of the flange of the rough-shaped steel piece rolled by breakdown forms a curved surface, the edge sail roll 1
There is a phenomenon in which it is difficult for U jJl to fully reach the corners of the flange inner corner corresponding portion 14 of No. 3.

For this reason, when the flange 8 was then rolled by the universal mill 4, the .S. dimples 10 on the outer surface of the flange were rolled and expanded in the width direction of the flange as shown in FIG. 10, and the corners 9 on the inner surface were chipped. It becomes a shape. Due to the rolling down of the flange tip by the Edger Mill 5 and the rolling down of the flange thickness by the Universal Mill 4, the shape of the flange tip is improved by repeating the rolling passes, but it is not completely resolved. Finishing pressure i
Your product may also have a protrusion 15 on the outside of the flange tip and a corner drop 16 on the inside (see Figure h), and this phenomenon is more likely to occur as the flange of the product is thicker.

Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned problems. Specifically, the pressure of the coarse universal mill group, 1. ',
1.(・Th1 As shown in the figure, it solves the problems that cause shape defects such as the outer protrusion at the flange tip and the inner corner falling off.

<'Fl Light Configuration> Means for solving the problem and its operation, the present invention provides a method for solving the problem, from a breakdown mill, a rough universal mill, and a finishing universal mill to an H-shaped steel rolling mill. The group includes two edger mills A and B, and in the first half of the pass, the inner side is shaped higher than the outer side, which is the shape of the flange tip.
Rolling is performed in the same manner as in the conventional example in one and a half passes to prevent defects in the shape of the tip of the flange shown in Fig. h.

-εko'(-2 Figures 1, 2, 3, and 4 are shown as rL2 in the middle C!): A more detailed explanation of the invention is as follows.

First, FIG. 1 is a layout diagram of a row of rolling mills used in the non-inventive process. As shown in FIG.
Roughly rolled and finished with Universal Mill 3 [Ii
be done. In this rolling equipment row, the breakdown mill 1 and finishing universal mill 3 are the same L as the conventional one:
However, in the rough universal mill group 2', unlike the conventional one, there is a rough universal mill 4 and two edger mills A 5a and 2 edger mills adjacent to it.
Place Mill B 5b. Further, on the back side of these edger mills 5a and 5b, in the edger mill A 5a, only the upper roll is shown for convenience in the upper and lower rolls 1]i2. ) of the flange end rolling surface 21 and the roll surface 22 corresponding to the flange inner surface (hereinafter referred to as the flange inner surface corresponding surface 2
The included angle θ formed by The included angle θ formed by the cap surface 22 is set to 85° to 89°. .)
Roll cauterization part 2 corresponding to the inner corner of the flange tip 71
4 (hereinafter referred to as the flange tip inner corner corresponding part 24 on the instep,
, ) is the distance t in the roll of Edger Mill A 5a! Make it larger than ih.

Therefore, when rolling the rough shaped steel slab rolled by the breakdown mill 1 in the rough universal mill group 2' as described above, in the first half of the reciprocating few passes, the upper and lower roll gaps of the edger mill A 5a are The material is set so that the tip of the flange does not touch the rolling surface 21 of each flange end of the upper and lower rolls, and the material is passed through Edger Mill A 5a in an empty pass.
Rough rolling is performed using a universal mill 6 and an edger mill B 5b. 4+ <; In the first pass, the universal mill 4's h.h' and vertical rolls 12. /1.'FJ Rudake Edger Mill B 5b's upper and lower rolls each flange end rolling surface 2
1, the flange tip is shaped and rolled.

At this time, the shape of the flange tip is the same as that of the conventional example shown in Fig. 9, with 5 and 10 dimples on the outside and a corner drop 9 on the inside, but in the upper and lower rolls of Edge Mill B 5b, As shown in FIG. 10, since the included angle θ formed by the flange inner surface 22 and the flange tip rolled surface 21 is smaller than 90°, even if the universal mill 4 is used next to roll the flange outer surface as shown in FIG.・The outer surface will not be high due to blinding. That is, the smaller the included angle θ is, as shown in FIG. 10, the cross-section of the pressurized material h1 has a shape in which the inner side is higher than the outer side at the flange tip.

Mouth-like Universal Mill 4 and Edge 1 Armill B
5b is repeated until the predetermined pass, and in the latter pass, the rolling is carried out by Edger Mill A 5a and Universal Mill 4.
and rolling.

That is, this time, conversely, the tip of the flange, which is the roll gap of Edger Mill B 5b, is opened wide enough not to be rolled down, and an empty pass is made, whereas the roll gap of Edger Mill A, '+a, is rolled down, which is the tip of the flange, which is the tip of the flange. Although the flange end corner of the material is smaller than 90°, the edger The included angle θ of the O-R corresponding portion of Mill A 5a is approximately 90° as described above. , as shown in Fig. 4, the material starts to contact the rolled flange end face 21 of the roll from the flange tip corner 27, so even if there is a corner drop 26 (see Fig. 3) before rolling, The material is easily pushed into the corners of the roll, and the corner drop 1'j is eliminated or the degree of corner drop is reduced. Furthermore, in the case of T Shiji\・-Roll A 5a, the roll distance r + If to Etsujiya Roll B
By appropriately setting the 1" clearance, which is smaller than 5b, it is possible to set the amount of reduction at the tip of the outer surface of the flange to either extremely light or about 1[1/1/1".
Shown in Figure 9? I, 5, and 10 do not occur.

As mentioned above, Etsiya Mill A 5a with a pass of one and a half shells.
After performing rough rolling for one or more passes with the universal mill 4 and the finishing roll hE with the finishing universal mill 3, it is possible to produce a product with good perpendicularity and no discoloration at the tip of the flange.

Note that the included angle θ of Edger Mill A 5a is normally set to approximately 90° in order to improve the perpendicularity of the flange of the product, but the deviation from 90° is slight due to the slight deviation from 90° when the flange is suppressed with Finishing Universal Mill 4. Decide by considering changes in the angle of. Furthermore, if the included angle θ of the edger mill B 5b is made too small, the edger mill A 5a will not roll down to the outer corner of the flange, which will deteriorate the shape of the outer corner of the flange.

These spots occur on the product's flange thickness and on the flange outer surface.

5. Kurami 10, Edger Mill A Although it varies depending on the amount of reduction of the flange tip with 5a, the results of each experiment are as follows.
It has been found that the appropriate included angle θ of Edger Mill B 5b is 85° to 89°. In addition, the distance from the web corresponding surface to the inner corner corresponding part of the tip of the flange is set so that the material to be rolled is sufficiently rolled down at the tip of the flange by the edger mill A 5a.
so that it is larger.

Also, around the above time, 2M Edger Mill 5a, 5
b is installed before and after the rough universal mill 4, but both of the two edger mills 5a and 5b may be placed in front of or after the rough universal mill 4.
The positions of the mills 5a and 5b may be exchanged.

As explained in detail above, the method of the present invention includes one universal mill in the coarse universal mill group and at least two edger mills in the group, and these On the back, first, the distance Mh from the web facing surface to the flange tip inner corner corresponding part is approximately 85 to 89 degrees.
Rough rolling is performed using a long edge semi-mill B and a universal mill, and then the included angle θ between the flange tip rolled surface of each roll and the flange inner surface corresponding surface is approximately 90°, and from the web corresponding surface to the flange tip inner corner corresponding part. The edger mill A, whose distance mh is shorter than that of the edger mill B, and the universal mill are used for rough rolling, followed by top rolling.

Therefore, in the first half of the pass, the flange tip 9 can be shaped and rolled without causing the 7S/darkening 10 shown in FIG. Can be shaped and rolled.

[Brief explanation of the drawing]

Figure 1 shows a pressure of 5ff and an installation W'il for carrying out the method of the present invention.
2, 3, and 4 are layout diagrams of an example of the rough universal mill I of the present invention! T-i,: Each explanatory diagram of the deformation mode during rough rolling, FIG. 5 is a layout diagram of a conventional rolling equipment, FIG. 6, FIG. 7, FIG. 8, FIG. 9, FIG. 10, and Fig. h is an explanatory diagram of various deformations during rough rolling in a conventional compact packed row. Go No. 1...Breakdown mill 2.2'...
...Rough universal mill revision 3...Finishing universal mill 4...Universal mill 5.5a, 51+...Edge sail mill 6...
...Rough shaped steel billet 7 after breakdown rolling...
Web 8...Flange 9...
Flange tip inner corner 10...S, blinding h, on the outer surface of the flange tip
... Universal mill horizontal roll 12 ...
Vehicle neck roll 1' - L sojour roll 1... J tour roll flange tip inner corner corresponding portion 15... Flange 5li: End outer corner 16 -・
...Flange tip inner corner drop 21...Ezier roll flange tip reduction surface 22...Edge sail roll flange inner surface λj response part 23...Edgeer roll wear compatible Side 2/1
...Etsuya roll flange tip 9 seat inner corner corresponding part 25...Flange S'i: Qg outer corner part 2G,
27... Inner corner of flange tip 9 Fig. 1 Atsushi 2 Fig. 3 Fig. 4 Atsushi 5 Fig. 6 Whistle q' / Fig. 7 S Fig. 10 Fig. 1'1 Fig. h1

Claims (1)

[Claims] When rolling H-section steel through a rough universal mill group consisting of a breakdown mill, an edger mill, and a rough universal mill, and a finishing universal mill, at least two edger mills A and B are arranged in the rough universal mill group, and In each roll of Edger Mill A, the angle θ between the flange tip reduction surface and the flange inner surface corresponding to the surface is set to approximately 90°, and in the edger mill B roll, the flange tip reduction surface and the flange inner surface corresponding to the angle θ are set to approximately 90°. The trapping angle is set to 85° to 89°, and furthermore, the distance h from the web-corresponding surface of the roll of both edger mills to the inner corner corresponding part of the flange tip is made longer for edger mill B than that of edger mill A,
After rolling in the breakdown mill, edger mill A is used in the first half of multiple passes in the rough universal mill group.
A method for manufacturing an H-beam steel, characterized in that rough rolling is performed only with edger mill B while making an empty pass, and in the second half pass, conversely, while making an empty pass with edger mill B, rough rolling is performed only with edger mill A.