JPS61126930A - Shaping method of h-shape steel flange tip - Google Patents

Abstract

PURPOSE:To produce an H shape steel having the flange part formed to a highly accurate dimensional shape by passing the shaping roll consisting of the specified upper and lower rolls in continuation to a finishing universal mill in case of producing the H shape steel by a hot rolling. CONSTITUTION:A blank steel id worked to the H shape steel 6 having a flange 6a and web 6b by rough rolling mills 20, 21, rough universal mill 24 and in succession the shape of the flange 6a is shaped by a shaping roll 25 and finished to the dimensional shape accuracy to the degrees of a butt welding capable by a robot weld. The shaping roll 25 has upper and lower rolls to shape the H shape steel 6 and equips with the device 32 to adjust the height of the lower roll, the gap adjusting device 33 of upper and lower rolls and rolling reduction force adjusting device 31 and the uncompleted tip part of the flange is shaped and rolled by these devices. The H shape steel of which shape and dimension being shaped to the accuracy of the degrees of a butt welding capable by a robot weld can be produced.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a method for shaping the tip of an H-section steel flange.

``Prior Art'' As is well known, H-beam steel is manufactured by continuously casting bloom 1^, beam blank 1B, or slab IC after reheating the material, as shown in Fig. 2 (A) to (F). , a breakdown rolling mill or the like to form a phase steel slab 2, which is then manufactured through a universal rolling mill group as shown in FIGS. 1(C) to 1(E). FIG. 1(F) shows H-type &H6 as a product, where part 6a is called flage and part 6b is called web.

In the universal rolling process, in the rough universal mill shown in FIG. 1(C), the flange portion is rolled by hard rolls 3B and horizontal rolls 3A, and the web portion is rolled by upper and lower horizontal rolls 3A.

Then, the tip of the flange that became the roll opening and was not formed in the rough universal mill is shown in Figure 1 (D).
It is molded using an edger mill 4 shown in FIG. Normally, this rough universal mill and Fujar mill are used for continuous rolling, and 2 to 1
After being subjected to 0-bus reverse rolling and rolled to a specified thickness, it is finished rolled in the finishing universal mill shown in FIG. 1(E) to complete the rolling.

In the finishing universal mill, the web is rolled down by the upper and lower horizontal rolls 5A, and the flange part is rolled down by the hard rolls 5B and horizontal rolls 5A, but the flange tips become roll openings and are not formed.

As mentioned above, since the flange tip end portion is not formed during finish rolling, the flange width of hot rolled H-section steel varies widely.

For this reason, the JIS dimensional tolerance is as large as ±3 tm.

``Problem to be solved by the invention'' However, up until now, there have been no particular problems in use with this tolerance, but recently, robot welding has started to be carried out, and robot welding now requires a tolerance of ±1.0fi or less to be used. Because of this, problems have arisen with conventional flange width accuracy in the case of flange butt welding.

``Means for Solving the Problems'', ``Function The present invention has been made in view of the above circumstances, and its gist is that immediately after the finishing universal mill in the rolling of hot-rolled H-section steel, A shaping roll consisting of upper and lower rolls is arranged in which the distance between the upper and lower rolls and the rolling force can be arbitrarily adjusted using a rolling mechanism with a buffering capacity such as air pressure, and the tip of the flange is shaped and rolled through the shaping roll. The point is that the width accuracy can be made suitable for robot welding in the case of flange butt welding.

"Example" Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a diagram showing an example of a rolling mill row to which the present invention is applied.

In the figure, 20.21 is a rough rolling mill, 22 is a rough universal mill, 23 is an edger mill, and 24 is a finishing universal mill. And 25 is a shaping roll which rolls down the tip of a specially installed flange immediately after the finishing universal mill 24 in the present invention.

3 and 4 are a plan view and an elevation view showing the layout of the shaping roll 25. FIG.

In the figure, 26 is a cam waltz, and 27 is a driving motor.

Reference numeral 28 denotes side rollers for guiding the H-section steel to the shaping rolls 25.As will be described later, the widths of the left and right flanges of the H-section steel are different, and for this reason, the material is This is a device to guide and correct this as it tends to bend.

FIG. 5 is a detailed view of only the shaping roll 25. In the figure, 32 is a device for adjusting the height of the lower roll, 33 is a device for adjusting the distance between the upper and lower rolls, and 29 is a torque limiter. This is an example of driving the rolls to improve the biting property of H-section steel, but always matching the peripheral speed of the shaping rolls to the finishing universal rolling speed.

There are various dimensions of the H-shaped steel 6 to be formed. For example, in a medium-sized steel rolling line, H100X 100~H2O0~2
00. H-beams with dimensions of H100X50 to H250X150 are manufactured. In other words, the web height is 100w
Products with a weight of ~2501 and a flange width of 50 to 200 fl are manufactured. In addition, the flange plate thickness in this case is 4.5n
~ #20㽽■.

As described above, since products of various dimensions are targeted, the shaping roll 25 should: (1) be able to adjust the height of the lower roll;

(2) The upper and lower roll spacing C can be adjusted.

(3) The rolling force can be adjusted.

is necessary.

In the figure, reference numeral 31 denotes a device for adjusting the rolling force, which is composed of a rolling mechanism having a buffering capacity such as an air cylinder, and is a device for changing the rolling force in accordance with the flange thickness of the H-section steel to be rolled.

The reason why the device 31 is made simple and inferior in strong pressure forming force, unlike the edger mill 4 in the previous step, is for the following reason.

That is, the flange width distribution of the H-shaped steel 6 before passing through the shaping rolls of the present invention is as shown in FIG. 6, and the left and right flanges have an excess portion 6c and a deficiency portion 6d, making them unbalanced. However, when the shaping roll 25 acts on this,
As shown in Figure 7 a - d, the results are a) without shaping, an appropriate amount of shaping (b), and an excessive amount of shaping (c, d), but if the rolling force is too large, the result shown in figure d is This is to prevent the flange from buckling.

The purpose of the present invention is to produce a product free of defects such as blistering (C) and buckling (d), and as described below, even with such a slowly acting shaping force, it is sufficient to achieve the desired purpose. It is played.

In other words, the present invention is H200X 100X 3.2X 4
．． Figure 8 shows the degree of variation in flange width for the H-beam steel No. 5 with and without flange width.

As is clear from the figure, by using the shaping roll, the variation range of the flange width can be reduced from 98.5 to 10
It decreased from 2m turtle to 99.0=101.5+n, 1
Pass rate within 00n±1.0m is 84.2% to 97.
%.

The setting conditions for the shaping roll at this time are: Roll diameter: φ200 Tsuru Rolling force: =1000kg Upper and lower roll spacing: 101. (hm Met.

``Effects of the Invention'' As described above, according to the present invention, in rolling hot-rolled H-section steel, the requirements for robot/rotate welding can be met by carrying out a simple process immediately after the finishing universal mill. This can be achieved with a light burden from a cost standpoint, and is extremely meaningful in practice.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a rolling line to which the present invention is applied, FIG. 2 is a rolling process procedure diagram for hot-rolled H-beam steel, and FIG. FIG. 4 is a plan view and an elevation view of a rolling down device according to the present invention;
FIG. 5 is a front view of the shaping roll section according to the present invention, and FIG.
The figure is a longitudinal cross-sectional view of the H-section steel before being shaped according to the present invention, Figure 7 a w d is an explanatory diagram of the flange section after being subjected to shaping reduction, and Figure 8 is a comparative chart showing the shaping effect of the present invention. It is. IA...bloom, IB...beam blank, IC
... Slab, 2 ... Rough shaped steel piece, 3A ... Horizontal roll, 3B ... Hard roll, 4 ... Edger mill, 5
A...Horizontal low/[/, 5B...Hard roll, 6...
・H-shaped steel, 6a...flange, 6b...web, 6
c...Excess part, 6d...Insufficient part, 20.2
1...Roughing mill, 22...Roughing universal mill, 2
3... Edger mill, 24... Finishing universal mill, 25... Shaping roll, 26... Cam waltz, 27... Motor, 28... Side roller, 2
9... Torque limiter 131... Device for adjusting the rolling force, 32... Device for adjusting the lower roll height, 33
...A device that adjusts the distance between upper and lower rolls. Figure 1 Figure 3 Figure 6 Figure 7 a, b, c, d. Figure 8

Claims (1)

[Claims] Immediately after the finishing universal mill during rolling of hot-rolled H-section steel, a shaping roll consisting of upper and lower rolls is installed, which allows the spacing between the upper and lower rolls and the rolling force to be arbitrarily adjusted using a rolling mechanism with a buffering capacity such as air pressure. A method for shaping the tip of an H-section steel flange, characterized in that the tip of the flange is shaped and rolled through this process.