JPH06335701A - Method and device for rolling shape steel - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rolling method / rolling apparatus that enhances the production efficiency in each stage of rough rolling or finish rolling and is preferable in terms of material temperature conditions, equipment costs, installation space, and the like. [Composition] A universal mill in which a beam blank is a material to be rolled p and rough rolling is performed by repeatedly passing it through a horizontal mill 11 and a universal mill 12 successively, and then a flange portion of the material p is widened to form an X-shaped cross section. 21 and the edger mill 22 and the universal mill 23 which rolls the flange portion of the material p at right angles to the web and having an H-shaped cross section, and then repeatedly finish-rolls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shaped steel, especially large H
The present invention relates to a rolling method and rolling apparatus suitable for manufacturing shaped steel and the like.

[0002]

2. Description of the Related Art Large H-shaped steel is produced by roughly rolling a beam blank manufactured by continuous casting or ingot ingot in a break mill, and then subjecting it to intermediate rolling or finish rolling in a universal mill. It is generally manufactured by. FIG. 2 shows an outline of such a conventional general shape rolling mill. In FIG. 2 (a) which is a layout drawing, reference numeral 13 is a breakdown mill, reference numerals 24 and 31 are universal mills, and reference numeral 25 is an edger mill having a horizontal roll.

In the apparatus shown in FIG. 2 (a), a beam blank (see FIG. 2 (b)) as a material to be rolled p is heated in a heating furnace 1, and then, first, a breakdown mill 13 is used to move the beam blank shown in FIG. 2 (c).
Rough rolling like. That is, rolling is repeated in the direction of decreasing the height of the web as shown in (c) while repeating several passes to a dozen or more passes back and forth, and the closed caliber 13c and the open caliber 13o (each caliber is a breakdown mill 13). Are formed on the same roll), so that the flange portion and the like are rolled.

The material subjected to the rough rolling is the transfer 2
In addition to the horizontal feed, the universal mill 24 having horizontal and vertical rolls (see FIG. 2 (d)) and the edger mill 25 having horizontal rolls (see FIG. 2 (e)) are passed back and forth about ten times. Then, so-called intermediate rolling is performed. The vertical roll of the universal mill 24 has a double cone shape with the upper and lower ends being narrower.
The horizontal roll of No. 5 also has a shape corresponding to it, and all of them maintain the cross-section of the material in a shape close to the X shape, so this rolling may be referred to as "X rolling".

After the completion of such intermediate rolling, the material is passed through a finishing universal mill 31 as finishing rolling (see FIG. 2).
(See (f)), and make it a product. Finishing universal mill 31
Since the vertical roll of is a right cylinder type and the material has an H-shaped cross-section, this rolling is sometimes called "H rolling". If such an expression is used, the material after rough rolling is subjected to X-rolling in multiple passes and then H-rolled to be commercialized.

An apparatus similar to that shown in FIG.
Although it is also introduced in Japanese Patent Publication No. 109101, the rolling device as shown in FIG. 3 is also disclosed in this publication. In the apparatus of FIG. 3, the position of the finishing universal mill 31 is brought closer to the edger mill 25 or the like, so that the length from the breakdown mill 13 to the finishing universal mill 31 is shortened and the space occupied by the apparatus is reduced. However,
During the intermediate rolling (X rolling) by the universal mill 24 and the edger mill 25, the roll interval of the finishing universal mill 31 is left open, and after the intermediate rolling is finished, the finishing rolling (H rolling) is performed by the finishing universal mill 31. The rolling process itself for p is no different than in the apparatus of FIG.

In addition, Japanese Patent Publication No. 59-1122 discloses a rolling apparatus shown in FIG. In the apparatus shown in FIG. 4, the rolling mills (universal mills 24 and 31 and the edger mill 25) for intermediate and finishing are the same as those in FIG. 2, but the horizontal mill 14 and the universal mill 15 are used as rolling mills for rough rolling. They are placed close to each other. The horizontal mill 14 comprises a horizontal roll having a part for pressing down a web of material and a part for pressing down a flange end (edge), the universal mill 15 together with a vertical roll,
It is equipped with a horizontal roll with a web reduction section that is the same shape as the horizontal mill. In a breakdown mill consisting of only upper and lower horizontal rolls, the flange portion cannot be rolled efficiently, whereas the horizontal mill 14 and the universal mill 15 arranged in this way reduce the number of necessary passes. Therefore, it is advantageous in terms of rolling efficiency in the rough rolling stage.

[0008]

The rolling apparatus shown in FIG. 2 has a disadvantage in terms of production efficiency at each stage of rough rolling and intermediate rolling. That is, it is necessary to repeat the pass about 10 times in each of the above steps, and it is necessary to rotate the material by 90 ° in the rough rolling step as shown in FIG. 2 (c). The large number of required passes is also disadvantageous in that the temperature of the material is likely to drop, which may further affect product deformation and residual stress. In addition, since the total length of the device is considerably long, there are great disadvantages in terms of equipment cost and installation space.

The rolling apparatus shown in FIG. 3 has the advantage of shortening the machine length required for intermediate rolling or finish rolling, but has little effect on the improvement of production efficiency. This is because there is no difference in the rough rolling stage as compared with the apparatus of FIG. 2 and the rolling process itself has not changed as described above for the intermediate rolling. That is, the disadvantages associated with the required number of passes and the temperature conditions of the material are not largely eliminated.

On the other hand, in the rolling apparatus of FIG. 4, the number of passes required for the rough rolling step is reduced, so that there are considerable merits in terms of production efficiency and temperature conditions, but intermediate rolling and finish rolling are performed. 2 is not improved from the device of FIG. Therefore, the intermediate and finishing steps still require a large number of passes, are disadvantageous with respect to temperature, and have to prepare a long installation space. Further, in the technique of the above-mentioned publication related to FIG. 4, it is considered that there is still room for study on the material to be rolled in order to reduce the number of passes of rough rolling.

The object of the present invention is to provide a novel rolling method which enhances the production efficiency and makes the temperature condition of the material advantageous at any stage of the rough rolling and the intermediate / finish rolling, and is preferable in terms of the cost of equipment and the installation space. A method and rolling apparatus are provided.

[0012]

The method for rolling shaped steel according to the present invention (Claim 1) uses a beam blank as the material to be rolled, and rough rolling is performed by repeatedly passing it through a horizontal mill and a universal mill. , Universal mills and edger mills that spread the flange part of the material and roll it (for example, by rolling X section with X section if rolling H section steel), and make the flange section of the material at right angles to the web (H section section (By H-rolling into the H-shape) and then finish rolling by repeatedly passing it through a universal mill.

The rolling method is described in claim 2.
As described above, it is preferable to use a beam blank having a web thickness of 50 to 100 mm.

The apparatus for rolling shaped steel of the present invention (Claim 3) comprises: a) a rough rolling mill (mill) group including a horizontal mill and a universal mill, and b) a vertical roll thinned toward the end. A finishing rolling mill (mill) group including a universal mill having the same, an edger mill that reduces the flange end portion (edge) of the material with a horizontal roll, and a universal mill having a right cylindrical vertical roll is arranged. .

[0015]

In the method of rolling shaped steel according to the first aspect of the present invention, rolling of H-shaped steel, I-shaped steel and groove-shaped steel is performed as follows.

First, the beam blank is used as the material to be rolled as described above. Beam blanks are coarse shaped steel slabs produced by continuous casting or ingot ingots.
By using this as a raw material in accordance with the conventional method of rolling a shaped steel, the shaped steel rolling can be performed more efficiently than in the case of using a billet having a simple rectangular cross section such as a slab or a bloom.

Such a material to be rolled is roughly rolled as described above by a horizontal mill and a universal mill instead of the conventional breakdown mill. The horizontal mill performs rolling to reduce the height of the flange (flange width) and the thickness of the web (see Fig. 1 (c)) for the material with the web oriented horizontally. Rolling is performed mainly for the purpose of reducing or increasing the thickness (distance between flanges) and reducing the web thickness and the flange thickness (see FIG. 1 (d)).

Rough rolling of the material is carried out by repeatedly passing the material through the horizontal mill and the universal mill in this manner. Such rolling is carried out by a breakdown mill consisting of only upper and lower horizontal rolls (per caliber rolling). It is possible to reduce the number of passes to less than half that of the conventional method, because the flange part of the material can be efficiently reduced in pressure. Further, it is not necessary to rotate the material by 90 ° for each pass. Therefore, rough rolling can be performed efficiently, which is advantageous in terms of material temperature conditions as described later.

The rough-rolled material to be rolled is finally rolled by passing it through the universal mill, the edger mill, and the other universal mill as described above, and repeating it. On the other hand, the universal mill and the edger mill perform so-called X rolling in which the flange portion of the material is widened (in the case of channel steel or the like, it does not become X-shaped, but equivalent rolling).
(See (e) and (f)), but in the other universal mill, so-called H rolling (or equivalent) is performed with the flange portion of the material perpendicular to the web (see FIG. 1 (g)). Since the material is continuously and repeatedly passed through each of such mills, at this stage of finish rolling, the so-called “X-H
Rolling "will be repeated.

Such X-H rolling is necessary if the H rolling is finally performed in the final pass (that is, the material is passed so that the universal mill that makes the flange portion at right angles to the web is the last). And proper finish rolling (including intermediate rolling in the conventional method shown in FIGS. 2 to 4) can be performed, but in addition to that, the intermediate and finish rolling can be efficiently completed with a smaller number of passes than in the past. . This is because conventionally, the pass was repeated only for two mills (universal mill and edger mill), whereas in the XH rolling of the above method, the material is repeatedly passed through three mills. Therefore, it becomes possible to finish the intermediate or finish rolling of the H-section steel with the number of passes which is about half or two-thirds that of the conventional method.

As described above, in the rolling method of the present invention, the required number of passes can be reduced and the production efficiency can be increased at each stage of rough rolling and finish rolling (including intermediate rolling). If the number of passes decreases and the production efficiency increases, the temperature drop of the material during rolling also decreases, so not only the advantage of energy saving for heating the material but also the power required for rolling and the deformation and residual stress of the material are advantageous. There is. In addition, although the number of passes was discussed above, if the number of mills of the same type is increased and the material is passed through them (in this case, the material is passed through the mill of the same type repeatedly) It goes without saying that the number of required passes is reduced. Therefore, the above description regarding the number of passes is based on the assumption that the number of mills at each stage of rough rolling and finish rolling is set to a necessary minimum.

According to the rolling method of claim 2, the beam blank as the material to be rolled has a web thickness of 50 to 50.
A so-called near net shape of 100 mm (that is, close to the product shape) is used, whereby the production efficiency can be further improved. Conventional beam blanks generally have a web thickness of about 120 mm, but in recent years, some beam blanks having a thickness of 100 mm or less can be supplied due to the development of continuous casting technology and the like. In the rough rolling stage, multiple passes are mainly required to reduce the thickness of the web, so if a material with a small thickness is used in the material stage, the number of required passes naturally decreases. Become.

The rolling device of claim 3 is a device which can be directly used for carrying out the rolling method of claim 1 or 2. That is, the beam blank as the material to be rolled (described above)
Is first passed through the rough rolling mill group of the above a) to perform the rough rolling described above, and then the finish rolling is performed by passing the material through the group of finish rolling mills of the b). In the finishing rolling mill group, from the universal mill having vertical rolls that are narrower toward the end to the edger mill, the above-described X rolling is performed based on the shape of the vertical rolls, etc. The above H rolling is performed, and these are continuously repeated. Since the rough rolling and finish rolling of each bring high production efficiency and advantageous temperature conditions as described above,
This rolling mill can produce high-quality shaped steel with excellent productivity.

If a large number of mills are provided in each rolling mill group in this rolling mill, the space occupied by the mill increases, but the number of passes required to reciprocate the material in each stage naturally decreases. However, conversely, when arranging the minimum required number of mills for each rolling mill group, the total length of this rolling mill becomes extremely short. In particular, it is constructed by arranging a group of finish rolling mills for intermediate to finish rolling by arranging three mills shown in b) close to each other, and the required length of the portion is the same as that of a conventional rolling mill (of FIG. 2). This is because it is considerably shortened as compared with the intermediate and finish rolling part in. If the total length is shortened, the rolling mill can be installed in a relatively small factory for production, and has an advantage that the facility cost is reduced mainly for the material transport device.

[0025]

FIG. 1 shows an embodiment of the present invention. FIG. 1 (a) is a schematic layout drawing of a rolling apparatus for H-section steel.
(g) is a schematic diagram showing a cross section of the material to be rolled p and a shape of a rolling roll in each portion in the apparatus. The H-section steel to be produced by the apparatus of this embodiment is centered at a height (outer edge between flanges) of 600 mm × width (flange width) of 300 mm to a height of 200 mm × width of 100 mm.

As shown in the drawing, in this rolling mill, a rough rolling mill group 10 is first arranged on the upstream side where a heating furnace 1 is installed, a finishing rolling mill group 20 is arranged on the downstream side across a transfer 2, and further downstream. A cooling floor (not shown) is provided on the side (right side of FIG. 1 (a)). The material p to be rolled is a beam blank as shown in FIG.
After being heated at 1, the rough rolling mill group 10 is reciprocated several times to perform rough rolling in a plurality of passes. Then, after being laterally fed by the transfer 2, the finishing rolling machine group 20 also makes a plurality of passes to perform finish rolling.

Regarding the rolling of the H-section steel by this rolling apparatus, the following means are adopted for the purpose of improving the production capacity, reducing the cost of the equipment and downsizing.

First, as the beam blank which is the material p to be rolled before rolling, a thin one called a near net shape is used. The cross-sectional view is shown in FIG. 1 (b). For the production of the H-section steel of the above size, for example, the dimensions (height h shown in the figure x width w x web thickness t) are 525 mm
× 310mm × 75mm, or 295mm × 210
mm × 75 mm is used properly.

Secondly, the rough rolling mill group 10 is composed of one horizontal mill 11 and one universal mill 12, and the material to be rolled p is roughly rolled by reciprocating between the two. As shown in FIGS. 1 (c) and 1 (d), it is assumed that the material p is passed through the horizontal mill 11 and the universal mill 12 without changing the direction of the material p (that is, without vertical or horizontal turning), and The horizontal roll 11a performs rolling to reduce the height (width) of the flange and the thickness of the web, and the universal mill 12 mainly aims to reduce or increase the height of the web and reduce the thickness of the web and the thickness of the flange. Roll it.

According to the rolling which is continuously passed through the horizontal mill 11 and the universal mill 12, the flange portion of the material p can be efficiently subjected to high pressure, so that the number of passes required for rough rolling is reduced. This is because the flange portion is efficiently rolled down, so that the width w of the material p as a raw material is reduced.
However, it is also very important that the width of the H-section steel as a product (flange width) may be as thin as approximately. In the embodiment, the rough rolling by the group of rough rolling mills 10 is 3 to 3 of the material p.
It was completed by 5 passes, and the number of passes was 1/2 to 1/3 as compared with the conventional rough rolling using a breakdown mill (see FIG. 2). Further, since the rough rolling is completed in a short time based on the decrease in the number of passes and the fact that the material p does not need to be turned, the surface temperature of the material p at the time of completion is about 50 ° C. higher than in the conventional case. became.

As a third point, as shown in FIG. 1 (a), by arranging each one of the universal mill 21 and the edger mill 22 and the other universal mill 23 in close proximity to each other, a finish rolling mill is provided. A group 20 is constructed so that material p can be successively passed through these three mills for intermediate or finish rolling. As shown in FIG. 1 (e), the universal mill 21 includes a horizontal roll 21a contacting the inside of the web and the flange of the material p,
It has a vertical roll 21b which is thin toward the upper and lower ends and is in contact with the outside of the flange. The vertical roll 21b
The flange portion of the material p is expanded in accordance with the shape and so on, and so-called X rolling is performed to reduce the web thickness and the flange thickness. The edger mill 22 is provided with a horizontal roll 22a which is in contact with the flange end (edge) of the material p as shown in FIG. Since this horizontal roll 22a also has a portion that contacts the inside of the flange in the expanded state, the edger mill 22 also has a so-called X-shape.
The material p is rolled by rolling. The universal mill 23 shown in FIG. 1 (g) has a flat horizontal roll 23a in contact with the web of the material p and a vertical cylindrical vertical roll 23b. Based on the shapes of the horizontal rolls 23a and the vertical rolls 23b, the flange portion of the material p is erected at a right angle to the web, and so-called H rolling is performed to reduce the web thickness and the flange thickness.

The rough-rolled material p is reciprocally passed through the finishing rolling mill group 20 and repeatedly rolled (so-called X-H rolling) to manufacture an H-section steel having a predetermined shape and size. However, since the necessary and appropriate finish rolling can be performed by only three mills arranged close to each other, the finish rolling mill group 20 first has a small number of mills (base number) and an occupied space. Has the advantage of being small (short). In addition, the material p is alternately rolled down from three mills (two of them are used to reduce the web thickness and flange thickness) by one pass, so finishing rolling can be performed with fewer passes than before. To In this example, finish rolling could be completed in 3-5 passes, which is conventional, i.e., in a single pass from a mill with two materials p (web thickness / flange thickness). This corresponds to almost half the number of passes for the finish (intermediate) rolling of the system of FIGS. If finish rolling is completed in an odd number of passes and the material p is sent to the cooling bed on the downstream side (right side of FIG. 1 (a)), the universal mill 23 will of course perform H rolling to finish the shape of the material p. Will be prepared. In addition,
Since the required number of passes is small, the surface temperature of the material p at the time of completion of finish rolling is 100 ° C. higher than that of the conventional example.
It gets higher.

By adopting the above-mentioned three means together, this rolling mill has the following excellence in terms of productivity and cost. That is, a) The production capacity will be greatly improved, and the annual production of 900,000 tons, that is, the production amount equivalent to about 80% increase when the rolling mill of the same type as the conventional mill shown in Fig. 2 is operated under the same conditions can be expected. It became so.

(B) The entire length of the rolling apparatus (the length from the heating furnace 1 to the universal mill 23 in FIG. 1 (a)) is about 14
The result is 0 m, which is a result of extremely shortening 200 m, which was a conventional common sense as an H-shaped steel rolling device.

C) Since the conveying devices between the mills have been downsized and simplified due to the shortened overall length, FIG.
The total equipment cost is about 1 compared to a rolling mill of similar type to
It was reduced by 0%.

D) Since the temperature drop of the material is small, the heat consumption in the heating furnace and the power consumption for driving each mill are reduced.

Although one embodiment has been introduced above, it goes without saying that the present invention is not limited to this embodiment. For example, rolling H-section steel other than the exemplified sizes,
It is applied to the rolling of shaped steels other than H-shaped steel (I-shaped steel, grooved steel, etc.), reduces the number of passes by arranging a large number of mills in each of the roughing and finishing rolling mill groups. Implementation such that the arrangement order of the horizontal mill and the universal mill in the rolling mill group is reversed can be easily implemented within the scope of the technical idea of the present invention, and the same operational effects as described above are brought about. In addition, although it is expressed as "repeatedly threaded" in claim 1, rough rolling or finish rolling may be completed in one pass depending on the sectional size of the beam blank used as a raw material or the sectional size of the product shaped steel. , That does not exclude that case.

[0038]

The rolling method (claim 1) and the rolling apparatus (claim 3) of the present invention have the following effects. That is, 1) The number of passes required in each stage of rough rolling and finish rolling is reduced, and it is not necessary to turn the material, so that the production efficiency is improved.

2) Since the required machine length is shortened, it is easy to install in a small factory and the equipment cost is reduced.

3) Since the temperature drop of the material is small, it is possible to produce high-quality shaped steel with a small amount of deformation and residual stress, and also to reduce the basic unit in terms of heat and electric power.

According to the rolling method of the second aspect, the production efficiency is further improved.

[Brief description of drawings]

FIG. 1 (a) is a schematic layout diagram of an H-section steel rolling apparatus as one embodiment of the present invention, and FIGS. 1 (b) to (g) show materials to be rolled in respective portions in the apparatus. FIG. 3 is a schematic view showing a cross section of and a shape of a rolling roll.

FIG. 2 (a) is a schematic layout diagram of a conventional general shaped steel rolling device, and FIGS. 2 (b) to (f) are cross-sectional views of a material to be rolled and rolling rolls at respective portions in the device. It is a schematic diagram which shows the shape of.

FIG. 3 is a schematic layout view showing another conventional shaped steel rolling apparatus.

FIG. 4 is a schematic layout diagram showing still another conventional shaped steel rolling apparatus.

[Explanation of symbols]

 10 rough rolling mill group 11 horizontal mill 12 universal mill 20 finishing rolling mill group 21/23 universal mill 22 edger mill p rolled material

Claims (3)

[Claims] 1. A universal mill and an edger mill for rolling a beam blank as a material to be rolled, which is roughly rolled by successively passing it through a horizontal mill and a universal mill and then expanding the flange portion of the material, and a flange portion of the material. A method for rolling shaped steel, characterized in that finish rolling is carried out by repeatedly passing it through a universal mill that rolls at right angles to the web. 2. The method of rolling a shaped steel according to claim 1, wherein a web thickness of 50 to 100 mm is used as the beam blank. 3. In addition to a rough rolling mill group including a horizontal mill and a universal mill, a universal mill having a vertical roll that is narrowed toward the end, and an edger mill that reduces the flange end of the material by the horizontal roll, A rolling mill having a group of finishing rolling mills including a universal mill having a right cylindrical vertical roll.