JPH02112801A - Universal rolling method and rolling machine for flanged shape steel - Google Patents

Abstract

PURPOSE:To decrease the deviation of a center and to improve productivity by rolling down the entire surface of the outside surface of a flange by perpendicular rolls of one rolling mill and simultaneously rolling down the top and bottom ends of the flange by the horizontal rolls of one rolling mill. CONSTITUTION:The 1st universal rolling mill is a conventional universal roughening mill and a step part is provided to the horizontal roll side part, i.e., small-diameter roll part 40 of the 2nd universal rolling mill. Reverse rolling is executed by these two universal rolling mills. The step part 40 is pressed to a part or the whole of the end edge of the flange and the flange is rolled down. The outside surface of the flange is rolled down over the entire surface by the perpendicular rolls 32 simultaneously therewith. A shearing deformation is generated in the neck part of the web and the flange in this way and the deviation of the center is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a universal rolling method for flanged section steel such as H section steel and a rolling mill therefor. For details,
The present invention relates to a method of rolling a rough section of a flanged section steel such as an H section steel using a universal rolling mill, which is particularly efficient due to the U-U arrangement and has a small center deviation, and a rolling mill therefor.

(Prior art) In general, flanged sections (hereinafter referred to as
For example, as shown in Figure 1 (al), the hot rolling of "H-beam steel" will be explained by taking an example of "H-beam steel".
0, rough universal rolling mill 11, Enger rolling va1
2 and a finishing universal rolling mill 13. That is, after raw materials such as slabs, rectangular billets, and steel billets for H-beams are roughly shaped into a predetermined shape by a breakdown rolling mill 10, they are subjected to rough universal rolling [11 and an intermediate stage of multiple passes by an engagement rolling mill 12]. After rolling, it is rolled in one pass in a finishing universal rolling mill 13 to obtain a product H-shaped steel. The rolling process at this time is
As shown in FIG. 2(a), a web 2 of H-beam steel is rolled by horizontal rolls 20 in a rough universal rolling mill 11, and a flange 1
a and 1b are tapered and supported by vertical rolls 21. Next, as shown in FIG.
3, the flanges 1a and 1b are raised.

During the rolling process of such H-shaped steel, center deviation may occur due to uneven cross-sectional areas of the four flanges on the top, bottom, left and right, or poor relative positioning of the horizontal rolls and vertical rolls. Occur. This center deviation is defined as (a-b)/2 as shown in FIG.

Conventionally, to deal with the occurrence of such center deviation,
As proposed in No.-263801, Figure 1 (b
In the rolling mill row in which the intermediate rolling mill group shown in 1 is composed of the first and second rough universal rolling mills 11.14, while rolling a part of the flange surface with the vertical rolls of the second rough universal rolling mill 14, A method has been proposed in which the face plate portion and the flange side end of the web 2 are simultaneously rolled down using the horizontal rolls of the universal rolling mill. The rolling process at this time is as follows.
As shown in the figure, the web is rolled by a pair of horizontal rolls 31.31, and the flange surface is rolled down by a pair of vertical rolls 32.32.

(Problem B to be Solved by the Invention) Figure 5 fal and (bl are enlarged views of the roll arrangement shown in Figure 4 divided into the initial pass and final pass stages, respectively, and in particular the horizontal roll 31 and the vertical roll 31. This emphasizes the gap between the rollers 32 and the roll 32.It is true that the method disclosed in JP-A-61263801 improves the center deviation to some extent, but there are the following problems: Breakdown rolling The rolled material rolled by the machine 10 is shown in FIGS. 4 and 5 (
Universal rolling mill 11 having the structure as shown in a) and (b).
14, as is clear from FIG. 5, the width of the vertical roll 32 is always smaller than the distance between the upper and lower horizontal rolls when the minimum gap is between the upper and lower horizontal rolls 31 and 31. The rolling down of the flange by the vertical rolls 32, 32 is limited to only the parts that are in contact with the rolls. Therefore, there is always a part that is not rolled by the vertical rolls, although there are varying degrees of degree, in all passes from the start to the end of rolling, and this part serves as the unrolled part 33, where a predetermined flange thickness cannot be obtained. The boundary between the rolled portion 33 and the rolled portion remains as a linear flaw in the rolling direction.

Furthermore, when the universal rolling mill with the structure shown in Fig. 4 is put into practical use, each time the product flange width is changed, in addition to the horizontal roll pair, a vertical roll according to the horizontal roll shape and dimensions (minimum gap between the upper and lower horizontal rolls) is required. It becomes necessary to exchange the pair. For this reason, there are also problems that lead to an increase in the number of rolls held and an increase in the time required for replacing the rolls.

Therefore, an object of the present invention is to solve the problems faced by the prior art, to further reduce the center deviation without requiring complicated controls and equipment, and to prevent the occurrence of linear flaws as described above. It is an object of the present invention to provide a highly efficient universal rolling method and rolling mill for flanged section steel such as H section steel.

(Means for Solving the Problems) Therefore, the present inventors investigated in detail the above-mentioned problems faced by the prior art, and during universal rolling of flanged sections, rolled the entire outer surface of the flange of the section steel using vertical rolls. At the same time, by rolling down the step part installed on the side of the horizontal roll by contacting part or all of the flange edge, it is possible to suppress the occurrence of center deviation and to prevent the occurrence of linear flaws on the outer surface of the flange. The present invention was completed based on the discovery that this can also be prevented.

Here, the present invention provides a rolling mill group consisting of a first reversible universal rolling mill and a second reversible universal rolling mill, in which a flanged section steel material is rolled by the vertical rolls of at least one of the universal rolling mills. A flanged section steel characterized in that the outer surface of the flange of the section steel is rolled entirely, and at the same time, a part or all of the upper and lower end edges of the flange of the section steel rolled material are rolled down using horizontal rolls of at least one universal rolling mill. It is a universal rolling method.

According to an embodiment of the present invention, the rolled section steel material may be reverse rolled.

Further, among the rolling mill groups, the vertical roll shape of the first reversible universal rolling mill is spindle type, the vertical roll shape of the second reversible universal rolling mill is cylindrical, and the rolling mill group The steel rolled material may be reverse rolled.

In addition, these two versal rolling mills, the first and the second, are
A group of rolling mills may be arranged in a rolling line with a length of 1 m or more to perform rolling in one pass.

From another aspect, the present invention provides a universal rolling machine for rolling flanged sections such as H-beams, which has a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls coaxially arranged with the horizontal rolls. The universal rolling mill is characterized in that small-diameter roll portions are provided on both sides of the horizontal roll, and the roll width of the small-diameter roll portion is made variable.

In one embodiment of the present invention, at least two or more universal rolling mills are arranged in tandem, and each mill rolls down the entire surface of the flange surface and web, thereby significantly improving rolling efficiency. This is what I am trying to do.

(Function) Next, the universal rolling method for a section steel of the present invention will be described in detail below, taking an H section steel as an example of a flanged section steel, with reference to the accompanying drawings.

The basic configuration of the H-section steel rolling line to which the present invention is applied is the first
Fig. 6 shows the cross-sectional shape of the H-beam steel processed according to the present invention.Furthermore, Fig. 7+al, (bl) shows the rolling line when the present invention is applied Another arrangement example is shown below.

The roll shape of the universal rolling mill used in the present invention is
Figure fal, mountain), fcl. In Figure 8 fat, the first
The universal rolling mill 11 is a conventional rough universal rolling mill, and a step portion is provided on the horizontal roll side portion of the second universal rolling mill 14, that is, a small diameter roll portion 40 (hereinafter also referred to as a “step portion”), and both universal rolling mills are provided with a stepped portion. At step 11.14, reverse rolling is performed, and at the same time, the stepped portion 40 is brought into contact with a part or all of the flange end edge and rolled down, and at the same time, the vertical roll 3
2, the entire outer surface of the flange is rolled down. Also the 8th
In the figure (bl, there are stepped portions 4 on the sides of both the horizontal rolls of the first universal rolling mill 11 and the second universal rolling mill 614.
0, reverse rolling is performed with both universal rolling mills 11 and 14, and the stepped portion 40 rolls down a part or the entire flange edge, and at the same time, the vertical roll 32 rolls the entire flange outer surface. That is.

Here, the rolling process of the rolled section steel material in the present invention will be explained.

Fig. 6 fa), horizontal roll 3 with a stepped portion 40 in the mountain)
1 shows the states of the initial pass and final pass of the reverse rolling process of a rough-shaped steel piece (beam blank) of H-beam steel in the universal rolling mill according to the present invention consisting of 1.

As shown in FIG. 6 fat, in the initial pass, the flange thickness of the rolled section steel material is larger than the width of the stepped portion 40 of the horizontal roll 31, so the stepped portion 40 rolls down a part of the flange edge. Just do it. On the other hand, in the final pass shown in FIG. 6 fbl, the width of the stepped portion 40 is designed to be equal to the finished flange thickness, and the stepped portion 40 is used to roll down the entire surface of the flange edge to shape the flange end. .

In the case of the initial pass shown in FIG. 6 far, the stepped portion 40 of the horizontal roll 31 compresses only a part of the flange edge, so that the material does not bulge out in the unpressed lower part of the flange edge. Although this is a concern, this problem can be resolved by balancing the web rolling reduction ratio by the center of the horizontal roll 31 and the rolling reduction ratio of the outer surface of the flange by the vertical rolls 32, and suppressing the width expansion of the flange portion in the vertical direction.

The effect of preventing the center deviation of the finished product is better in Fig. 8 (ta+ and 8th roll mill) than in Fig. 8 (bl is in Fig. 8 + a), but on the other hand, the same (al) is better in the first universal rolling mill. This has the advantage of allowing a large reduction in the outer surface of the flange, increasing the efficiency of the entire rolling mill.

In either method, the shaped steel rolled material rolled by the breakdown rolling mill 10 is rolled by the first universal rolling mill 11 and the second universal rolling mill! At this time, even if the center deviation occurs in the breakdown rolling or in the case of the first universal rolling 11 in the case of FIG. Horizontal roll 3 provided with section 40
When the web and flange are rolled down in the universal rolling mill consisting of 1, the edge of the flange is also rolled down and rolled in a completely vertically symmetrical state, so the attachment of the web and flange causes shear deformation at the root. As a result, the center bias is eliminated.

The rolled section steel material that has undergone intermediate rolling is generally rolled into a product in the finishing universal rolling mill 13, but in this finishing rolling, only flanges are raised, so there is almost no center deviation. Thus, it is possible to roll a section steel with extremely small center deviation.

The above is an explanation of the case where the present invention is applied to the H-beam rolling line shown in Fig. 1 fb).
The universal rolling method for section steel is shown in Figure 7 (al).
It is also possible to apply it to a rolling line for section steel, and the roll shapes of the first and second universal mills in this case are shown in Figure 8 fcl, and in the rolling line of Figure 7 (al),
The rolled section steel material rolled by the breakdown rolling mill 10 is stretched by multiple passes of reverse rolling by the first and second universal rolling mills, and then stretched by the second universal rolling mill in the final pass.
'The unique feature is that the flange is raised into a rounded holly product shape at the same time as the flange edge is shaped using a universal rolling mill. Therefore, as shown in FIG. has a cylindrical shape, and the flange surface which was inclined by the first universal rolling mill 11 is straightened by the vertical rolls of the second universal rolling mill 14. As a result, the finishing universal rolling mill is omitted. can.

Further, according to the arrangement shown in FIG. 7fbl as another preferred example of the universal rolling method of H-beam steel of the present invention, the first and second: x nib as shown in FIG. -Sal rolling 111L 14 Two universal rolling mills are taken as one unit, and three rolling mill groups are arranged on the same rolling line. The rolled section steel material is subjected to first to sixth universal rolling ext, 14.15.
16, I7.1g Tei y < S Rolling and rolling - Finishing after one day; f The flange is raised with a universal rpiat 3 and finished into the final product shape. On this occasion,
When the web and the flange are rolled down in the universal rolling mill consisting of the horizontal roll 31 provided with the stepped portion 40 of the first to sixth universal rolling mills, the flange edge is also rolled down so that it is in a completely vertically symmetrical state. Because it is rolled, H-beam steel with extremely small center deviation can be manufactured. Furthermore, since the H-section steel is finished by one-pass rolling, it is possible to achieve significantly higher productivity than when reverse rolling is performed in multiple passes as described above.

Next, the following examples will be given as techniques similar to the Hf:m universal rolling method of the present invention, and the differences from the present invention will be clarified.

First, as an example, H
We will touch on the technologies proposed as rolling methods for shaped steel or similar shaped steel. This is the 9th rolling mill as the primary universal rolling mill 11 in the rolling line shown in the 1st report).
The structure shown in Fig. 9 (al) is adopted as the second universal rolling mill 12, and the structure shown in Fig. 9 (bl is adopted, 1
As an example, an H-shaped steel sheet pile is to be rolled. Here, FIG. 9 (al) has a configuration similar to that of a conventional universal rolling mill, while FIG. 9 (bl) has small diameter roll portions 43. 44 are integrally formed.The small-diameter roll portions 43 and 44 are brought into contact with the end edge of the flange 1 to be rolled and shaped.Furthermore, the vertical rolls 32. 32 has a roll width that allows it to be inserted between the upper and lower horizontal rolls 31.31 in a rolled state, and is in contact with the outer surface of the flange 1, or at most, to prevent the flange 1 from collapsing due to the rolling of the horizontal rolls 31.31. The reduction is only 10%.

Therefore, the vertical roll 3 in the universal rolling of the present invention
The structure is completely different from that in which the entire outer surface of the flange is rolled down as in No. 2, and the role of the vertical rolls 32 is also essentially different from that of the present invention.

That is, in the present invention, the entire outer surface of the flange is actively rolled down with the vertical rolls 32, contributing to an improvement in rolling efficiency, whereas the vertical rolls 32. The role of the flange 32 is nothing but to prevent bank ringing, such as the flange falling outward or bending, which occurs when the flange end edge is shaped.

In carrying out the present invention, the width of the stepped portion 40 provided on the side of the horizontal roll 31 of the universal rolling mill must be equal to the finished flange thickness of the H-section steel, as described above. Conversely, it is necessary to change the width of the stepped portion 40 according to the finished flange thickness of the H-section steel, which leads to an increase in the number of rolls and makes it difficult to finely adjust the flange thickness. Therefore, this problem can be solved by making the width of the stepped portion 40, that is, the stepped portion, variable by an appropriate mechanism (not shown). That is, when the product flange thickness is relatively large as shown in FIG. 10 f8+, the width of the stepped portion 40 is increased; By adjusting the width of the stepped portion 40 to a small value, the stepped portion 40 is surely brought into contact with the entire surface of the flange end edge in the final pass, thereby making it possible to shape the end edge. As a step adjustment method (not shown), it is possible to apply a method using a hydraulic mechanism built in the horizontal roll 31, a method using a screw mechanism, etc. The details of these methods will be clear to those skilled in the art from the above explanation. Probably.

Next, the effects of the present invention will be illustrated more specifically by examples.

Example nominal dimensions H3O0X 200 (mm), web thickness 1
0 (mm) and flange thickness of 16 (ml) was manufactured by the method according to the present invention. The configuration of the rolling mill at this time was the arrangement shown in FIG. 1 (bl), and the roll shapes of the first and second universal rolling mills were those shown in FIG. 8 fa+.

The H-shaped steel material subjected to breakdown rolling was reverse rolled by the first and second universal rolling mills 11 and 14, and then flanged by the finishing universal mill 13 to be finished into a product. For comparison, an H-section steel of the same product size was rolled using a conventional rolling method using the rolling mill configuration shown in FIG. 1 (al).

The roll shape of each universal rolling mill in this case was as shown in FIG.

The flange leg length of the product rolled by the above method was measured at regular intervals in the longitudinal direction, and the center deviation (mm) was determined. The results are shown in Table 1. In addition, the same table also shows the rolling cycle time (sec) for each rolling method.

From Table 1, it can be seen that in the examples according to the present invention, the center deviation of the products is significantly reduced in terms of both the average value and the standard deviation, compared to the examples according to the conventional method.

In addition, in the embodiment according to the present invention, the first and second universal rolling mills are arranged in tandem to perform reverse rolling, so the rolling cycle time is dramatically improved compared to the embodiment of the conventional method. High efficiency rolling has become possible.

Table 1 (Effects of the Invention) According to the present invention, as detailed above, center deviation can be significantly reduced during universal rolling of H-section steel, and linear flaws can be prevented from occurring on the outer surface of the flange. This method has an excellent effect on improving productivity, and can be applied to the manufacture of H-section steel of various sizes by making the step portion, that is, the roll width of the small diameter roll variable.

[Brief explanation of drawings]

Fig. 1 fa) and the first equivalent) are the configuration diagram of the FI type copper conditioning rolling line; Figure 3 is an explanatory diagram of the state of center deviation; Figure 4 is a front view of a universal rolling mill for preventing center deviation; Figure 5 fat and figure 5 ibl are conventional center deviation prevention FIG. 6 (al and FIG. 6 (bl) are explanatory diagrams showing the universal rolling process of the present invention; FIG. 7 (al and FIG. A configuration diagram of an H-shaped steel rolling line to which the invention is applied; FIGS. 8(a) to 8fcl are front views showing the roll shape of the universal rolling mill used in the present invention; FIG. 9(a)
and FIG. 9 (bl is an explanatory diagram of a universal rolling method similar to the present invention; and FIG. 10 t3+ and FIG. 10 [b) are explanatory diagrams of a universal rolling mill of the present invention. 10 Ni Breakdown rolling mill 11: First universal rolling mill 12: Fjer rolling mill 13: Finishing universal rolling mill 14: Second universal rolling mill 15-18; Universal rolling mill 31: Horizontal roll 32: Vertical roll 40: Step part (Small diameter roll part) Withered A closed (0) Double concave

Claims (5)

[Claims] (1) In a rolling mill group consisting of a first reversible universal rolling mill and a second reversible universal rolling mill, the outer surface of the flange of the flanged steel section is rolled by the vertical rolls of at least one of the universal rolling mills. 1. A universal rolling method for a flanged section steel, which comprises rolling down a part or all of the upper and lower edges of the flange of the section steel rolled material using horizontal rolls of at least one universal rolling mill at the same time as the entire surface rolling. (2) The universal rolling method for a flanged section steel according to claim 1, characterized in that the rolled section material is reverse rolled. (3) Among the rolling mill groups, the vertical roll shape of the first reversible universal rolling mill is spindle type, and the vertical roll shape of the second reversible universal rolling mill is cylindrical. 2. The universal rolling method for flanged section steel according to claim 1, wherein the rolled section steel material is reverse rolled. (4) A flange characterized in that the first and second universal rolling mills according to claim 1 are used as one unit, and one or more sets of these rolling mills are arranged in a rolling line to perform rolling in one pass. Universal rolling method for shaped steel. (5) In a universal rolling mill for rolling shaped steel having a pair of upper and lower horizontal rolls and a pair of left and right vertical rolls arranged coaxially with the horizontal rolls, small-diameter roll parts are provided on both sides of the horizontal rolls, A universal rolling mill characterized in that the roll width of the small diameter roll portion is variable.