JP3027504B2 - Rolling method of profile with flange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method for freely forming various sizes in a shape having a flange, that is, H-shape and similar shape products in a rolling process.

[0002]

2. Description of the Related Art Profiles currently manufactured are characterized by a wide variety of types, cross-sectional shapes and dimensions, and a very large number of types and sizes. In order to produce these multi-products and multi-size profiles, the known conventional rolling method requires the preparation of a large number of rolling rolls and associated equipment. FIG. 8 shows an example of a conventional rolling equipment row for rolling a profile having a flange and a roll hole shape corresponding to the rolling equipment. FIG. 8 (a)
Fig. 8 (b), (c), and (d) show an example in which a double or triple horizontal rolling mill is provided from rough rolling to finish rolling to roll I-shaped steel and channel steel. Fig. 3 shows an example in which a double-type or triple-type horizontal rolling mill and a universal rolling mill are appropriately used in rough rolling to finish rolling following intermediate rolling to roll a straight steel sheet pile. In the conventional rolling method as shown in FIG. 8, in accordance with the type and size of a product to be manufactured, a rolling roll used from rough rolling to finish rolling and a guide as an accessory of the rolling roll are basically guides. Must be prepared for exclusive use. Therefore, in order to satisfy the needs of customers, such as diversification of product dimensions and expansion of the manufacturing range, there is a disadvantage that the cost is high and it is not easy to respond to the needs.

[0003] As a specific example, the case of H-section steel will be described below. In recent years, with the progress of the welding method, the production of so-called build-up H-section steel, which joins steel plates by welding and assembles them, has been growing. The reason is that a product of any size of the H-section steel can be freely manufactured according to needs.
That is, a typical example is an H-section steel having a web thickness that is relatively thin compared to the thickness produced by a conventional rolling method, or an H-section steel product series having various flange thicknesses in which the outer width of the web is kept constant. Needs. Here, when H-section steels with various flange thicknesses with the outer width of the web kept constant are used as members of beams, despite the fact that they are products that are advantageous for joining and construction between beams, the conventional rolling method Uses that are not being manufactured are shown below.

FIG. 9 (a) shows a typical example of a conventional row of H-section rolling equipment, in which one breakdown rolling mill 1 is used.
(BD), followed by a 4-roll universal rolling mill (RU) and an edger rolling mill (E) group 2 (RU-
E), 4-roll universal rolling mill 3 for finishing (FU)
It is composed of FIG. 9B shows shapes 4, 5, and 6 of the rolled material formed by the rolls of the rolling mills 1, 2, and 3 in FIG. 9A. FIG. 10 shows the relationship between the rolling rolls of the universal rolling method for rolling an H-section steel and the material to be rolled. Due to the function of the universal rolling mill, it is possible to freely change with the same set of roll pairs during rolling. The dimension is the gap 9 between the upper horizontal roll 7 and the lower horizontal roll 8.
And a gap 12, between left and right vertical rolls 10, 11,
13 only. Therefore, the web thickness 9 and the flange thicknesses 12 and 13 of the H-section steel can be changed, but the web inner width IW must be constant. As a result, when rolling a series of H-section steel products having different flange thicknesses, if the left and right flange thicknesses 12 and 13 are changed, the web inner width IW and the right and left flange thicknesses 12 and 1 are naturally changed.
The web outer width OW obtained by adding 3 has to be changed to various dimensions.

That is, as shown in FIG. 11, the H-section steel rolled by the conventional rolling method has a constant web inner width IW and a change in the flange thicknesses Tf ₁ , Tf ₂ , resulting in a change in the outer width O of the web.
It is a so-called product series having a constant inner web width in which W ₁ and OW ₂ change, and it is difficult to manufacture a product series having a constant outer web width. If an H-shaped steel product series having a constant web outer width OW is manufactured by a conventional rolling method using a universal rolling mill, the entire process of rough rolling to intermediate rolling to finish rolling is performed according to the change in the web inner width. Therefore, most of the upper and lower horizontal rolls need to be prepared, so that a large number of rolls need to be manufactured, and frequent rearrangement work of the rolls must be performed.

[0006] It is basically difficult to produce various sizes of a series of the same type in small lots by a conventional rolling method as shown in FIG. In response to this fact, techniques that have been proposed as methods for overcoming the problems have been disclosed in JP-A-59-202101 and JP-A-6-202101.
There are JP-A-279001 and JP-A-4-288902. The features of JP-A-59-202101 are as follows.
As shown in FIG. 12, two upper and lower skew rolls 14 are provided.
And 15 are in contact with the inside of the flange of the material, and the roll axis is reduced by rolling down the web adjacent to the flange of the material while maintaining the angle of the rolling direction and θ _{H in} the horizontal plane and θ _{V in} the horizontal plane. The object of the present invention is to widen the web in the width direction without causing web waves or the like by flowing the material in the width direction. In FIG. 12, the amount of widening can be adjusted by adjusting the angle θ _H formed by the skew rolls 14 and 15 with the rolling direction and the distance L between the skew rolls 14 and 14 ′ and between 15 and 15 ′. .

FIG. 13 shows a row of rolling mills for forming a plurality of sizes without changing the H-shaped steel by adopting the above-mentioned technology. The intermediate rolling step 27 includes a universal rolling mill and an edger rolling mill.
Is formed to a web thickness and a flange thickness close to the final product by a universal rolling mill (RU), and a material required for widening is provided near the flange of the web. (Hereinafter, the applied material is referred to as meat). The horizontal rolls 7 and 8 of the universal rolling mill are provided with a caliber for forming meat. The width of the cylinders of the horizontal rolls 7 and 8 corresponds to the minimum inner web width among the product sizes produced by the same roll. Widening process 3
By changing the amount of widening by the skew rolls 14 and 15, products having different inner web widths can be manufactured. No enlargement is performed for the size having the smallest web inner width.

[0008] The finishing universal rolling mill 4 is provided with a horizontal roll 1 so that shaping can be performed corresponding to different web inner widths.
6 and 17 are divided into two parts, and the width of the body can be changed. Japanese Patent Application Laid-Open No. 61-279001 discloses a method in which a material provided near a flange of a web is rolled down by a horizontal roll of a universal rolling machine in which a vertical roll is opened. There is disclosed a technique for widening a web by rolling down a material applied near a flange of a web with a machine. Fig. 13
In the above, the rolling is performed in a rolling mill row in which a universal rolling mill is arranged instead of the skew roll rolling mill.

[0009]

In any of the above-mentioned methods, it is possible to increase the width of the web by providing meat by a caliber of a horizontal roll of a universal rolling mill in an intermediate rolling process and rolling the meat in a subsequent process. It is important in doing it. By the way, as described above, since the fillet is generally formed by a caliber of a horizontal roll of a universal rolling mill in the intermediate rolling step, when the web thickness, the flange thickness, and the flange width are the same, after the intermediate rolling step, Regardless of the width, the shape is almost the same as that of the universal rolling mill horizontal roll caliber in the intermediate rolling process. On the other hand, in the web widening step, in principle, a large meat thickness is required for a large width, and a small meat thickness is required for a small width. Therefore, if a larger width is desired, it is desirable to form a large meat in the intermediate step.
If the width of the widening step in the widening step after the intermediate step is small, or if the width of the width is zero, the same shape of the meat is used, and in that case, the thickness of the meat becomes excessive. For this reason, the meat remaining after the widening process is shaped by a universal rolling mill in the subsequent finish rolling process, but if the shaping amount is large, the meat is not sufficiently shaped (erased), There is a problem that a part of the meat is left up to the final product, or a problem that a shape defect such as a web wave occurs at the time of shaping the meat.

[0010] Therefore, the fillet shape given in the intermediate rolling step assumes that the fillet is shaped in the finish rolling step when the widening amount is small or zero, and the shaping in that case is sufficiently possible. Need to be limited to just the size. In other words, in order to manufacture products of more sizes with the same roll combination, it is necessary to perform a large width in the widening step, but since the excess meat must be shaped in the finish rolling step, There is a problem in that a sufficiently large meat cannot be formed in the intermediate rolling step, and as a result, the size that can be manufactured is limited because a large width cannot be formed.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention utilizes an edger rolling mill in an intermediate rolling step to control the shape of a meat fill before a widening step.
That is, in the gist of the present invention, the rough rolling step, the intermediate rolling step, the web rolling step and the intermediate rolling step in the profile rolling method having a flange consisting of the finish rolling step, the web portion and the front end face of the flange simultaneously. An edger rolling mill having a function of independently reducing the amount of reduction and each reduction amount is provided, and a concave caliber is provided near a flange of a roll of the edger rolling machine, and the web portion and the flange are formed by the rolling mill. There is provided a method for rolling a profile having a flange, wherein the shape of a web portion adjacent to the flange is controlled by simultaneously lowering a front end surface.

[0012]

In general, the intermediate rolling process comprises a universal rolling mill and an edger rolling mill as described above.
For example, as shown in FIG.
It is arranged at a position adjacent to the universal rolling mill and controls the flange width as shown in FIG. 2 when rolling is performed continuously with the universal rolling mill and the edger rolling mill in one rolling pass. There is also an example in which a universal rolling mill, an edger rolling mill, a universal rolling mill and three rolling mills are arranged in series. The inventors have studied a method of controlling the shape of the meat in the intermediate rolling step by using the edger rolling mill. That is, as described above, in the conventional method, a beam blank is formed in a rough rolling step, and is rolled to a shape close to a final product in a subsequent intermediate rolling step.
At that time, a calender provided to the horizontal roll of the universal rolling mill in the intermediate rolling step forms a meat on the web near the flange. In the widening step after the intermediate rolling step, the meat is rolled and the web is widened. In the widening step, since the amount of reduction of the meat varies depending on the width, the excess meat is shaped in the subsequent finishing step.

[0013] However, in the conventional method of forming a predetermined meat in the intermediate rolling step and shaping the excess meat in the finishing rolling step after the widening rolling, there is a limit in the ability to shape the meat in the finishing rolling step. In addition, the amount of meat that can be formed in the intermediate rolling step is limited, and therefore the amount of widening is limited. Therefore, a method of controlling the amount of meat applied in the intermediate rolling step in accordance with the amount of widening is desirable. According to this method, since the excess meat after the widening step can be made very small, the ability to shape the meat in the finish rolling step, which has been a factor limiting the widening amount in the conventional method, does not matter.

As shown in FIG. 3, in order to perform shaping of the meat by the edger rolling mill in the intermediate rolling step, the flange tip and the meat forming portion (web portion) are formed in a plurality of rolling passes by the edger rolling machine. ) Must be rolled simultaneously. Here, since the thickness of the web gradually decreases with the progress of the intermediate rolling step, the dimension 1 in FIG. 3 differs for each rolling pass. Therefore, it is necessary for the edger rolling mill to independently control 2 and 3 in FIG.

As an edger rolling mill having such a function, for example, an eccentric type variable diameter edger rolling mill shown in FIG. 4 is known. This edger rolling mill has been developed for the purpose of equalizing A1 and A2 in FIG. 4 by rolling.
Can be changed. That is, by the rolls 1 and 3 of the edger rolling mill, the web portion and the front end portion of the flange can be simultaneously reduced, and the reduction amount of each portion can be controlled independently. FIG. 5 (a) shows a conceptual diagram of the case where this edger rolling mill is applied to meat shaping.
(B).

However, although the meat is shaped by the edger rolling, in this method, since the amount of reduction in the meat portion is larger than the amount of reduction in the center of the web, the rolled meat is moved in the direction of the flange. The phenomenon that A (hereinafter referred to as web inner width) increases due to flow and rolling occurs. On the other hand, as described above, the inner width in universal rolling is always constant. Therefore, in this method, in the intermediate rolling step, the expansion of the inner width of the web by the edger rolling and the reduction of the inner width of the web by the universal rolling are repeatedly performed. It has been found through studies by the inventors that a problem such as occurrence of a problem occurs.

The inventors have found that the concave caliber shown in FIG. 6 is provided to an edger rolling mill. FIG. 1 shows a conceptual rolling diagram when this edger rolling mill is applied to meat shaping in an intermediate rolling process. Since the edger rolling mill has a concave caliber, the difference in the amount of reduction between the center of the web and the fillet is small, so that the fillet easily flows in the rolling direction and the inner width of the web is increased by the edger rolling. Buckling and occurrence of rolling flaws can be eliminated.

The shape of the concave caliber may be determined in consideration of the degree of meat provided by a universal rolling mill, etc.
In principle, the height in the web thickness direction of the meat formed by one universal rolling pass in the intermediate rolling process does not greatly exceed the thickness reduction in the thickness direction of the web in the pass. After rolling 2
Considering that the edger rolling is performed again after obtaining the universal rolling of the pass, the depth A of the concave caliper of the edger in FIG. 6 is set to a depth corresponding to the reduction amount in the web thickness direction by the two-pass universal rolling. For example, by the edger rolling, it is possible to prevent the meat filling portion from being excessively rolled as compared with the central portion of the web. According to this method, the minimum height of the fillet formed by the intermediate rolling step is the same as A in FIG. 6, but this is because even if the feed reduction in the widening step is zero, It is high enough to be shaped. The width B of the concave caliber in FIG. 6 may be approximately the same as the meat width. In addition, when the amount of widening is large and a large amount of meat is required, the reduction of the meat by the edger in the intermediate rolling process is limited to only a few passes before the intermediate rolling process, or is set to zero. It is possible.

[0019]

FIG. 7 shows a web height of 600 mm and a flange width of 200 mm.
With respect to a web thickness of 12 mm and a flange thickness of 16 mm, a comparison was made of the shape of the meat when the meat was reduced by the edger mill of the present invention in the intermediate rolling step and when the meat was not reduced. The rolling pass on the horizontal axis in FIG. 3 is defined as one pass including universal rolling and edger rolling that are continuous in the intermediate rolling process. As for the conditions for reducing the meat, the meat was reduced by all edger rolling. The concave caliber applied to the edger mill had a width of 60 mm and an average depth of 2 mm. A test piece was sampled from the rolled material at the end of each pass, and the meat area was measured. It can be seen that the meat shape is divided depending on the presence or absence of meat pressure by the edger.

[0020]

According to the present invention, the range of the widening rolling is widened, and the production size with the same roll combination is increased.

[Brief description of the drawings]

1 (a) and 1 (b) are explanatory diagrams relating to a method of reducing meat by an edger with a caliber.

FIG. 2 is an explanatory diagram of functions of a general edger rolling mill.

FIG. 3 is a view for explaining simultaneous reduction of a flange tip and a web portion by an edger rolling mill.

FIGS. 4A and 4B are explanatory views of an eccentric type edger rolling mill.

FIGS. 5A and 5B are conceptual diagrams when an eccentric edger rolling mill without a caliber is applied to meat shaping.

FIG. 6 is an explanatory diagram showing a caliber of an edger devised in the present invention.

FIG. 7 is a view showing the results of an example.

8 (a), (b), (c) and (d) are explanatory views showing a conventional section steel rolling method.

FIGS. 9A and 9B are views showing a conventional H-section rolling process.

FIG. 10 is a diagram showing a method for producing an H-section steel by a universal rolling mill.

FIG. 11 is a diagram for explaining that the inner web width of the H-section steel is constant.

FIGS. 12A and 12B are diagrams illustrating a web widening rolling method using skew rolls.

FIG. 13 is a diagram showing a rolling mill row for performing web widening rolling.

[Explanation of symbols]

 1: rolling mill (BD) 2: rolling mill (RU-E) 3: rolling mill (FU) 4, 5, 6: rolling mill 7: upper horizontal roll 8: lower horizontal roll 9: gap (web thickness) 10, 11: vertical roll 12, 13: gap (flange thickness) 14, 15: skew roll 16, 17: horizontal roll 18: vertical roll 19: shaped steel before widening 20: shaped steel after widening

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-199001 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 1/08-1/14

Claims (1)

(57) [Claims] 1. A method for rolling a profile having a flange comprising a rough rolling step, an intermediate rolling step, a web widening step and a finish rolling step, wherein in the intermediate rolling step, a web portion and a flange tip face are simultaneously reduced, and In addition to disposing an edger rolling mill having a function of independently controlling the reduction amount of the roll, a concave caliber is provided near the flange of the roll of the edger rolling mill, and the web portion and the flange end face are simultaneously lowered by the rolling mill. And controlling the shape of the web portion adjacent to the flange.