JPS6076202A - Method for finish rolling steel shape - Google Patents

Abstract

PURPOSE:To roll channels having each different web height without rearranging rolls by bisecting upper and lower horizontal rolls freely movably in their axial directions respectively and adjusting the distances between respectively bisected horizontal rolls and between vertical rolls in accordance with the cross-sectional dimensions of a steel shape to be rolled. CONSTITUTION:A steel shape having a web and flanges is finish rolled by an universal mill having upper and lower horizontal rolls and a pair of vertical rolls 11, 12. The upper and lower horizontal rolls are divided respectively into two pairs of horizontal rolls 21, 22, 23, 24 freely movably in their axial directions, and the distances between respective divided horizontal rolls 21, 22, 23, 24 and between the vertical rolls 11, 12 are adjusted respectively in accordance with the cross-sectional dimensions of a steel shape to be rolled, to perfrom finish rolling. Accordingly, innumerable H-beams having each the same flange thickness fF and different web height WF can be manufactured without rearranging the rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing steel sections having webs and flanges of various cross-sectional dimensions with high precision and economically.

(Prior art) Taking H-beam steel as an example of a shaped copper having webs and flanges, the conventional H-beam manufacturing process consists of steel ingots, continuously cast slag, bloom, and beam blanks, as shown in Figure 1. The thick rolled material is cast as it is or after being reheated to an appropriate temperature, and is then processed by grooved rolls 1 and 2 installed in an appropriate processing device such as a continuous or reciprocating double rolling mill or a forging machine. B. The first step of manufacturing the rough shaped steel billet 3, horizontal rolls 4, 5 and vertical rolls 6 incorporated in a continuous or reciprocating universal rolling mill consisting of a universal rolling mill and an edging rolling mill.
．． 7, a second step of manufacturing an intermediate material 8 by reducing the thickness of the part and adjusting the flange width in the edging rolling mill, and a horizontal roll 9 incorporated in the universal rolling mill; The process is roughly divided into a third step in which the finished product 13 is produced by passing the next roll 11t12. The first step to the third step are each comprised of a single rolling mill or a plurality of rolling mills.

To explain the conventional method of changing the cross-sectional dimensions of the rolled material without changing the rolls (including changing the hole shape) in each of these steps, first, in the first step, as shown in FIG. (or tilt between left and right) rolls
C,, to CB□ (If the size of the dimensions shown in the diagram matters, this also includes changing cB2 to cBl. The same applies below)
Change the web thickness to tB, change the width to tB2, and change the flange width to BBl to BB2. in this case,
The web inner width WB% web height W cannot be changed unless the rolls are rearranged (including roll hole type changes). ). Also, tBl and “B21 B
The changeable range of Bj and B10 is the size of the cross section of the rolled material,
(Restrictions on stretching balance within the cross section, hole size, etc.) have their own upper and lower limits, and at the same time cannot be changed freely individually.

In addition, in the second step, as shown in Fig. 2(b) and (c), in a universal rolling mill, the horizontal roll gap is changed and the web thickness is changed from tul to jl.
) tu2, and by changing the gap between the horizontal roll and the vertical roll, the flange thickness is changed to fu2 (in this case, the flange thickness fu1 r fu
2), the web height, wLll, also changes automatically to wLI2), and in the edging mill, the upper and lower roll gap tej is set to t. If you change it to 2, the flange width will be B. 1yoj5B. Change to 2. In this case as well, if you do not perform role reshuffling, please refer to @Town, W on the web.

cannot be changed. In addition, the range of changes in these dimensions tends to be limited due to constraints such as the dimensional range of each part that can be manufactured in the first process and the reduction balance within the cross section in the second process. The range of dimensional changes is also limited.

Furthermore, in the third step, as shown in FIG. 2(d), by changing the gap between the upper and lower rolls, the web thickness is reduced to t.
Fl is changed to tF2, and by changing the gap between the horizontal roll and the horizontal roll, the 7-larger/ji thickness fF1 is changed to fF2 (at the same time, the web height w, changes to WF2). In this step, as in the case of the above two steps, the inner web width wF cannot be changed unless the rolls are rearranged. In addition, due to constraints such as the range of dimensions that can be manufactured in the second process and the balance of cross-sectional reduction in the third process, there is a natural limit to the range of changes in these dimensions. The range of changes is also limited.

Regarding the conventional method of changing the cross-sectional dimension of a rolled material in each of the above-mentioned steps, focusing on the third step in particular, Fig. 2 (d
), in this method, the inner web width W cannot be changed unless the rolls are rearranged, so the sifting flange thickness can be adjusted to F1 by adjusting the gap between the horizontal roll and the filling roll: If you change it to rt, the web height will automatically change to WFl! 1) Changed to WF2. For this reason, it is well known that one series of H-section steel is composed of several sizes with different web heights, as exemplified in Table 1, as an expedient method for manufacturing H-section steel economically. It is a fact.

Table l Despite this, in the conventional rolling method of the third step shown in Fig. 2(d), one set of horizontal rolls with different roll widths is required for each series with different inner web widths w2. In order to produce all series of such H-beams, it was necessary to keep a large number of horizontal roll sets on hand. Furthermore, if the number of series is expanded, the number of horizontal roll sets required will increase accordingly. For example, if one series is configured with webs of the same size, twice the number of horizontal roll sets will be required. Number of rolls in stock, roll turning,
Considering roll changes, etc., there is no way to economically produce H-beams with different web widths, which can be said to be almost infinite, and this is one of the reasons for restricting the number of H-beam series and sizes. It had become.

Furthermore, as shown in Fig. 3, since the side wall (portion a) of the horizontal roll for finish rolling of H-beam steel is configured almost vertically, if the core part is worn out during rolling, the web inner width W ,1
If the roll is repaired without changing it at all, there will be a huge loss in roll diameter, and economical production cannot be expected at all.
A repair method is used to reduce Fl. In this case, of course, there is a loss in roll diameter. Therefore, the web inner width gradually decreases from wFl at the beginning of roll use to "F2" at the end of roll use after repeated repairs. In this case, if we focus on the dimensions of the rolled product, the web inner width changes from wFl to WF2. In this case, if you try to keep the web height WF constant, the flange thickness needs to increase from fFl to fF2, and conversely, if you try to keep the flange thickness fF constant, the web height decreases from WFl to WF2. I understand that I have no choice but to do so.

Dimensional tolerances are determined for the web height and 7-zinge thickness within a range that does not interfere with use, and the flange thickness and
The permissible dimensional variations in web height etc. are limited to minute forces, but it is unavoidable that the average value of these dimensions differs slightly depending on the roll chance, so for special applications,
In addition to requiring complicated product management such as using products with the same roll chance, this was also a factor in rolling yield fluctuations.

(Structure of the Invention) As a result of repeated detailed studies, experiments, and observations regarding the rolling form, behavior of rolled material, and rolling mechanism, the present inventors have developed an innovative method that solves these problems all at once. This led to the invention of a method for rolling section steel, the gist of which is to produce section steel with sill nibs and flanges using a universal rolling mill with upper and lower horizontal rolls and a pair of left and right rolls. When finishing rolling, the upper and lower horizontal rolls are movably divided into two on a coaxial line, and the finish rolling is performed by adjusting the interval between the two divided horizontal rolls according to the cross-sectional dimensions of the steel section to be rolled. It is something to do.

(Examples and effects of the invention) The present invention will be explained in detail below with reference to the drawings.

4 and 5 show the combination of rolls in the third step according to the present invention, and FIG. 4 shows the horizontal rolls 21, 22, 23, .
24 and the next rolls 11 and 12 are rolled in the same direction as the horizontal rolls 21 and 22, and 23 and 24 are close to each other in the web height direction of the rolled material, and the next roll 11t12 is in the same direction as the horizontal rolls 21 and 23 and 22 and 24, respectively. This is when they move the same distance. In this case, the horizontal roll 21 and the vertical roll 11
(and 22 and 12.23 and 11 z 24 and 12) are kept constant, so the flange thickness f2 is kept constant. However, since the next roll 11°12 moves, the web height can be changed from WF to W, for example. That is, the horizontal rolls 21 and 2 are movably divided on a coaxial line.
2, 23, 24 and the following rolls 11 and 12 are rolled in a single roll set, and it is necessary to adjust the roll position. It can be manufactured without any replacement. Such rolling is completely impossible with conventional finish rolling methods, and if it were to be realized, countless sets of horizontal rolls would be required, making such a method completely impossible industrially. I had no choice.

What makes the method of the present invention possible is that the horizontal roll is movably divided into two on a coaxial line and moved in the web height direction, thereby making it possible to freely select the web inner width WF. As a result of detailed observation and analysis of the finishing rolling situation of H-section steel, we found that in order to finish the web thickness t to the expected value and prevent shaking on the exit side of the rolling mill, as with the conventional method, , a slight reduction must be applied to the entire web by the horizontal rolls, and for this purpose, despite the stereotype that the web contact surface of the horizontal rolls must be constructed in one piece. , the dimensional accuracy of the web thickness tF is the second
This is based on the completely new knowledge that finishing rolling only requires forming the flange and preventing shaking on the exit side of the rolling mill, and there is no need to lightly roll down the entire web with horizontal rolls, as it is fully guaranteed during the process. .

FIG. 5 shows another application example of the present invention, in which only the horizontal rolls 21, 22, 23, and 24, which are movably divided into two on the same axis, are moved without moving the next roll 11, 12. This is the case when In this case, next roll 11.12
does not move, so the web height WF is constant, but the horizontal rolls 21, 22, which are movably divided into two on the same axis,
Since the spacing between 23 and 24 is adjusted, the flange thickness changes from fFl to f1□, for example. In other words, a single roll set consisting of horizontal rolls 21, 22, 23° 24 and vertical rolls 11, 12, which are movably divided into two parts on a coaxial line, can be used to create countless H-beams with the same web height and different flange thicknesses. It is possible to manufacture In addition, horizontal rolls 2t, 23 sets and 22.2
It is easy to see that by making the moving distances of the four sets unequal, it is possible to produce H-beams with different left and right flange thicknesses.

As described in detail in the above two examples, according to the present invention, the horizontal roll 21°22.23.2 is movably divided into two parts on the same axis.
By adjusting the spacing between a single set of vertical rolls 11 and 12, it is possible to roll H-beams with an infinite number of cross-sectional dimensions. There is no need to prepare horizontal rolls for each series of section steel.
Moreover, since there is no need for roll reshuffling, immeasurable economic effects can be obtained.

Furthermore, according to the invention, for example, the side wall of the horizontal roll may be worn and repaired by turning.

Since the same flange thickness and web height can be obtained by simply moving the horizontal rolls (even during rolling, in the case of average smooth wear), these dimensions can be changed as required by the roll rolls as in the conventional method. There is no slight variation from chance to chance, dimensional accuracy is greatly improved, it is convenient to use, and the rolling yield is stabilized.

Regarding other cross-sectional dimensions, the web thickness is adjusted by adjusting the gap between the upper and lower sets of horizontal rolls 21 and 23, 22 and 24, which are movably divided into two parts on the coaxial line, and the flange width is determined by adjusting the gap between the upper and lower sets of horizontal rolls 21 and 23, 22 and 24. Body length and horizontal roll 21.2
This can be achieved by selecting a diameter of 2.23224 according to the production plan, but these values are precisely determined in the second process and there is little room for change in the third process.

The present invention has been described above in detail with respect to H-section steel as an example of a section steel having a web and a flange, but it is also applicable to other section steels having a web and a flange, such as the channel steel illustrated in FIGS. 6 and 7. It is possible. FIG. 6 shows horizontal rolls 21, 22, 23, and 24 that are movably divided into two parts on a coaxial line, and the next roll 11° 12. This is the case when the vertical rolls 11 and 12 are moved in the same direction and the same distance as the horizontal rolls 21 and 23 and 22 and 24, respectively. In this case, the horizontal roll 21 and the next roll 11 (and 22 and 1
2. Since the intervals between 23 and 11 and 24 and 12) are kept constant, the flange thickness f is kept constant. However, since the next rolls 11 and 12 move, the web height can be changed from WFl to WF2, for example. That is, horizontal rolls 21, 22, which are movably divided on a coaxial line. [By adjusting the roll position of a single set of rolls 3, 24 and the following rolls 11 and 12, rolling of channel steel with the same flange thickness and different web heights can be performed using a single set of rolls. It is possible without any change.

FIG. 7 shows that among the horizontal rolls 21, 22, 23, 24 which are movably divided into two on the same axis, only the lower roll 23, 24 is moved in the web height direction, and the upper rolls 21, 22 and the next roll 11, 12 is the case where it is not moved. In this case, the next roll '11.12 is not moved, so the web height WF is constant, but the horizontal rolls 21, 22, 23, Since the interval between the lower rolls 23 and 24 is adjusted from inside 24, the flange thickness can be changed from 'F1 to 'F2, for example. In other words, the horizontal rolls 21, 22°23.2 are movably divided into two parts on a coaxial line.
By using a single roll set of 4 and vertical rolls 11 and 12 and appropriately adjusting the roll spacing, it is possible to roll an infinite number of channel steels with the same sheave height and different flange thicknesses. Note that, as in the case of H-section steel, it is possible to roll channel steel having different left and right flange thicknesses by varying the amount of movement of the horizontal rolls 23 and 24.

Note that the shape of the roll to be used differs depending on the cross-sectional shape of the required product, as illustrated in FIGS. Although the combination of rolls to be used may vary, the present invention is necessarily applicable to these cases as well.

[Brief explanation of the drawing]

Figure 1 (a), (b), (e), Figure 2 (a)
p (b), Ca) p (d), Figure 3 (a)
l(b) is a diagram of a conventional shaped copper manufacturing process, a diagram of how to change cross-sectional dimensions in the process, and an explanatory diagram of a finishing roll, respectively;
4, 5, 6 and 7 are detailed explanatory diagrams of the present invention. 1.2... Groove roll 3... Crude steel piece 4.5...
Horizontal rolls 6, 7...Vertical rolls 8...Intermediate material
9,10...Horizontal roll 11.12...Next roll
13... Finished products 21. 22, 23, 24... Horizontal rolls Fig. 5 g,) P Fig. 6 Fig. 7

Claims (1)

[Claims] When finish rolling a section steel having a shirella and a flange in a universal rolling mill having upper and lower horizontal rolls and a pair of left and right subsequent rolls, the above-mentioned upper and lower horizontal rolls are movably divided into two on a coaxial line, and the cross section of the section steel to be rolled is A method for finish rolling copper shaped copper, characterized in that finish rolling is carried out by adjusting the interval between the two divided horizontal rolls and the low roll according to the dimensions.