JP3302783B2 - Rolling method and rolling device for section steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Large H-beams are prepared by subjecting a beam blank produced by continuous casting or ingot casting to rough rolling in a breakdown mill and then to intermediate rolling or finish rolling by a universal mill or the like. It is generally manufactured by: FIG. 2 schematically shows such a conventional general shaped steel rolling apparatus. In FIG. 2A, which is an arrangement diagram, 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 p to be rolled is heated in a heating furnace 1, and then, first, by a breakdown mill 13 as shown in FIG.
Rough rolling as in That is, the web is rolled in a direction to reduce the height of the web as shown in FIG. 3C while repeating the pass several times to several tens of times, and the closed caliber 13c and the open caliber 13o (each caliber is a breakdown mill 13). Is formed on the same roll) to roll the flange portion and the like.

The material subjected to the rough rolling is transfer 2
, And passed back and forth ten times to and from a universal mill 24 having horizontal and vertical rolls (see FIG. 2D) and an edger mill 25 having horizontal rolls (see FIG. 2E). Then, so-called intermediate rolling is performed. The vertical roll of the universal mill 24 has a double conical shape in which the upper and lower ends are thinner.
The horizontal roll No. 5 also has a shape corresponding to it, and the rolling is sometimes referred to as “X rolling” since the cross-section of each material is kept close to the X shape.

After the completion of the intermediate rolling, the material is passed through a finishing universal mill 31 as a finish rolling (FIG. 2).
(See (f))). Finish universal mill 31
This rolling is sometimes referred to as "H-rolling" because the vertical roll is a straight cylindrical type and the cross-sectional shape of the material is H-shaped. Using such an expression, the material after the rough rolling is subjected to X-rolling in a large number of passes and then H-rolled to be commercialized.

An apparatus similar to that shown in FIG.
As disclosed in Japanese Patent Publication No. 109101, a rolling apparatus as shown in FIG. 3 is also disclosed. 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, thereby reducing the length from the breakdown mill 13 to the finishing universal mill 31 to reduce the space occupied by the apparatus. However,
Since the roll interval of the finishing universal mill 31 is kept large between the intermediate rolling (X rolling) by the universal mill 24 and the edger mill 25, and the finishing rolling (H rolling) by the finishing universal mill 31 is performed after the completion of the intermediate rolling. The rolling process itself for p is no different from that in the apparatus of FIG.

[0007]

The rolling mill shown in FIG. 2 has disadvantages in production efficiency in each of the rough rolling and the intermediate rolling. That is, in each of the above stages, it is necessary to repeat about ten passes, and in the rough rolling stage, it is necessary to rotate the material by 90 ° as shown in FIG. 2 (c). The large number of passes required is disadvantageous in that the temperature of the material is likely to fall, which may further affect product deformation and residual stress. In addition, the fact that the overall length of the apparatus is considerably long has a great disadvantage in terms of equipment costs and installation space.

The rolling apparatus shown in FIG. 3 has the advantage of reducing the machine length required for intermediate rolling or finish rolling, but has little effect on improvement in production efficiency and the like. 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 for the intermediate rolling as described above. In other words, the disadvantages associated with the required number of passes and the temperature conditions of the material are not largely eliminated.

It is an object of the present invention to provide a novel rolling method which enhances the production efficiency in both the rough rolling and the intermediate / finishing rolling to make the temperature conditions of the material more advantageous, and which is preferable in terms of equipment cost and installation space. It is to provide a method and a rolling device.

[0010]

According to a method of rolling a section steel according to the present invention (claim 1), a beam blank is used as a material to be rolled, and the beam blank is subjected to rough rolling by repeatedly passing through a vertical mill and a horizontal mill. A universal mill and an edger mill for rolling the flange portion of the material by widening (for example, by rolling the cross section into an X shape when rolling an H-section steel), and making the flange portion of the material perpendicular to the web (for an H-section steel, And finish rolling by repeatedly passing through a universal mill that rolls (by H rolling into H shape).

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

The rolling device for section steel according to the present invention (claim 3) includes: a) a group of rough rolling mills (mills) including a vertical mill and a horizontal mill; and b) a vertical roll tapered toward an end. A finishing mill group including a universal mill having a horizontal roll, an edger mill for rolling down a flange end (edge) of a material with a horizontal roll, and a universal mill having a vertical roll of a straight cylindrical type is arranged. .

[0013]

According to the method for rolling a section steel according to the first aspect of the present invention, rolling of an H section steel, an I section steel, a groove section steel or the like is performed as follows.

First, a beam blank is used as a material to be rolled as described above. A beam blank is a crude steel slab manufactured by continuous casting or ingot casting.
By using this as a raw material in accordance with the usual practice of shaped steel rolling, it is possible to perform shaped steel rolling more efficiently than when using a steel piece having a simple rectangular cross section such as a slab or a bloom.

Such a material to be rolled is subjected to rough rolling as described above using a vertical mill and a horizontal mill instead of the conventional breakdown mill. The vertical mill performs rolling to reduce the web height (the distance between flanges) (see FIG. 1 (c)), and the horizontal mill applies the flange height (flange width) to the material whose web direction is horizontal. ) And rolling to reduce the web thickness (see FIG. 1 (d)).

[0016] Rough rolling of the material is performed by repeating the passing through the vertical mill and the horizontal mill in this manner.
Unlike rolling performed by a breakdown mill consisting of only upper and lower horizontal rolls, such rolling does not require the material to be turned, for example, by 90 ° for each pass, and also rolls mainly by reducing the height of the web and flange. Therefore, the number of required passes can be reduced to about half or less of the conventional one because there is no thickness reduction rolling of the web and the flange. Therefore, rough rolling can be performed efficiently,
As will be described later, the present invention is also advantageous with respect to the temperature condition of the material.

The material to be subjected to the rough rolling is passed through a universal mill, an edger mill, and another universal mill as described above, and finish-rolled by repeating the same. On the other hand, in the universal mill and the edger mill, so-called X rolling (rolling equivalent to the X-shape is not performed in the case of a channel steel or the like, but is performed in an expanded manner) by expanding the flange portion of the material (FIG. 1)
(e) and (f)), the other universal mill performs so-called H rolling (or equivalent) in which the flange portion of the material is perpendicular to the web (see FIG. 1 (g)). Since the material is continuously and repeatedly passed through each of these mills, in this finish rolling stage, so-called “XH
Rolling "will be repeated.

Such XH rolling is necessary if the H rolling is performed last in the final pass (that is, if the material is passed so that the universal mill that makes the flange portion perpendicular to the web is the last). In addition, appropriate finish rolling (including the intermediate rolling in the conventional method shown in FIGS. 2 and 3) can be performed, but in addition, the intermediate / finish rolling can be completed efficiently with a smaller number of passes than in the past. . This is because, in the past, the pass was repeated only to two mills (the universal mill and the edger mill), but in the XH rolling of the above method, the material was repeatedly passed through the three mills. Therefore, the intermediate or finish rolling of the H-section steel can be completed with about half to two-thirds of the pass number in the related art.

As described above, in the rolling method of the present invention, the number of necessary passes can be reduced and the production efficiency can be increased in each of the rough rolling and the finish rolling (including the intermediate rolling). If the number of passes is reduced and the production efficiency is increased, the temperature drop of the material during rolling is also reduced, so not only the advantage of energy saving in heating the material but also the power required for rolling, as well as the deformation and residual stress of the material There is. In the above, the number of passes is discussed, but if the number of mills of the same type is increased and the material is passed through them (in this case, the material will continue to be repeatedly passed through the same type of mill) Needless to say, the number of required paths decreases. Therefore, the above description regarding the number of passes is based on the premise that the number of mills at each stage of rough rolling and finish rolling is minimized.

In the rolling method according to the second aspect, the beam blank as the material to be rolled has a web thickness of 50 to 50.
A so-called near-net shape (that is, close to the product shape) of 100 mm 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, with the development of continuous casting techniques and the like, beam blanks having a thickness of 100 mm or less can be partially supplied. 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 will naturally decrease. Become.

The rolling apparatus according to the third aspect is an apparatus which can be directly used for implementing the rolling method according to the first or second aspect. That is, the beam blank as the material to be rolled (described above)
Is first passed through the group of rough rolling mills in the above a) to perform the above rough rolling, and then the above-mentioned finish rolling is performed by passing the material through the group of finishing rolling machines in b). In the finishing mill group, from a universal mill having a vertical roll narrowed toward the end to an edger mill, the above-described X-rolling is performed based on the shape of the vertical roll and the like, and a universal mill having a straight cylindrical vertical roll is used. The above-mentioned H-rolling is performed, and these are continuously repeated. As described above, rough rolling and finish rolling bring high production efficiency and advantageous temperature conditions, respectively.
This rolling mill can produce high-quality section steels 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 at each stage naturally decreases. However, conversely, when the minimum number of mills required for each rolling mill group is arranged, the overall length of the rolling mill becomes extremely short. In particular, a finishing mill group for intermediate or finish rolling is constituted by arranging the three mills shown in b) in close proximity to each other, and the required length of the portion is equal to that of a conventional rolling mill (of FIG. 2). This is because it is considerably shortened as compared with the intermediate / finish rolling part in the above. If the overall length is shortened, the rolling apparatus can be installed in a relatively small factory and used for production, and also has the advantage that the equipment cost is low, especially for the material conveying equipment.

[0023]

FIG. 1 shows an embodiment of the present invention. FIG. 1A is a schematic layout view of a rolling device for H-section steel,
(g) is a schematic diagram showing the cross section of the material p to be rolled and the shape of the rolling roll in each part in the apparatus. The H-shaped steel produced by the apparatus of this embodiment mainly has a height (outside 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 apparatus, first, a group of rough rolling mills 10 is arranged on the upstream side where the heating furnace 1 is provided, and a group of finishing mills 20 are arranged on the downstream side with the transfer 2 interposed therebetween. A cooling floor (not shown) is provided on the side (the right side of FIG. 1A). As shown in FIG. 1 (b), the material p to be rolled is a beam blank,
(Or directly conveyed from a continuous casting facility), and then first reciprocate several times in the rough rolling mill group 10 to perform rough rolling in a plurality of passes. Then, after the traverse is performed by the transfer 2, the finishing rolling is performed in the finishing rolling mill group 20 through a plurality of passes.

The following means are used for rolling an H-section steel with this rolling apparatus for the purpose of improving production capacity, reducing the cost of equipment and reducing the size of the equipment.

First, a thin material called a near net shape is used as a beam blank which is a material p to be rolled before rolling. FIG. 1 (b) shows a cross-sectional view. For the production of the H-section steel of the above size, for example, the dimensions (height h × width w × web thickness t shown) are 790 mm.
× 360mm × 100mm or 500mm × 225
Use the one with a size of 75 mm x 75 mm.

Second, the rough rolling mill group 10 is constituted by one vertical mill 11 and one horizontal mill 12, and the material p to be rolled is roughly rolled by reciprocating between the two.
As shown in FIGS. 1C and 1D, the vertical mill 11 and the horizontal mill 12
In the vertical mill 11, rolling is performed to reduce the web height by left and right vertical rolls 11 b, and in the horizontal mill 12, the material p is rolled without changing the direction of the material p (that is, without turning the material in the vertical and horizontal directions). Rolling is performed by the upper and lower horizontal rolls 12a mainly for reducing the height (width) of the flange and the web thickness.

Since the rolling that passes through the vertical mill 11 and the horizontal mill 12 is performed mainly by reducing the height of the web and the flange of the material p, the number of passes required for the rough rolling is reduced. In the embodiment, the rough rolling by the rough rolling mill group 10 is completed in 5 passes or less, and the number of passes is one half to one third as compared with the conventional (see FIG. 2) rough rolling using a breakdown mill. It was done with. Further, since the rough rolling is completed in a short time based on the reduction in the number of passes and the necessity of turning the material p, the surface temperature of the material p at the time of the completion is approximately 50 ° C. higher than in the past. became.

As a third point, as shown in FIG. 1 (a), one of the universal mill 21 and the edger mill 22 and the other universal mill 23 are arranged close to each other, so that A group 20 is formed for intermediate or finish rolling by successively passing the material p through these three mills. The universal mill 21 includes, as shown in FIG. 1 (e), a horizontal roll 21a in contact with the web and the flange of the material p,
A vertical roll 21b which is thinner near 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 widened according to the shape and the like, and rolling is performed to reduce the web thickness and the flange thickness by so-called X rolling. The edger mill 22 is provided with a horizontal roll 22a in contact with the flange end (edge) of the material p as shown in FIG. Since the horizontal roll 22a also has a portion that comes into contact with the inside of the spread flange, the edger mill 22 also has a so-called X
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 straight cylindrical vertical roll 23b. Based on the shapes of the horizontal roll 23a and the vertical roll 23b, the flange portion of the material p is set at right angles to the web, and rolling is performed by so-called H rolling to reduce the web thickness and the flange thickness.

The rough-rolled material p is reciprocatedly passed through such a group of finishing mills 20 and rolling (so-called XH rolling) is repeated to produce an H-section steel having a predetermined shape and dimensions. However, since the necessary and appropriate finish rolling can be performed by only three mills arranged close to each other, the finishing 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 reduced from three mills in one pass (from two of the mills for reducing the thickness of the web and flange), so that finish rolling can be performed with fewer passes than before. To In this embodiment, the finish rolling can be completed by 3 to 7 passes. However, this is the same as the conventional, that is, a usual single pass, in which the material p is removed from two mills (the web thickness and the flange thickness are This corresponds to almost half the number of passes for the finish (intermediate) rolling in the method of FIGS. When 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 in FIG. 1A), the universal mill 23 naturally performs H-rolling at the end to form the material p. Will be arranged. In addition,
Since the number of required passes is small, the surface temperature of the material p at the time when the finish rolling is completed is 100 ° C. higher than in the conventional example.
About higher.

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

(B) As the total length is shortened, the transport equipment between the mills is reduced in size and simplified, and the roll size can be reduced (the diameter of the vertical mill and the horizontal mill is smaller than that of the breakdown mill). 2) The overall equipment cost is reduced by 10% or more compared to a rolling mill of a type similar to FIG.

(C) 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, and it is also possible to carry out direct rolling without passing the heating furnace from the continuous casting facility. .

Although one embodiment has been described above, it goes without saying that the present invention is not limited to this embodiment. For example, when rolling an H-section steel other than the illustrated size,
Applied to rolling of section steels other than H-section steels (such as I-section steel and channel steel), a large number of mills are arranged in each group of roughing and finishing rolling mills to reduce the number of passes, or Implementation such as reversing the arrangement order of the vertical mill and the horizontal mill in the rolling mill group can be easily implemented within the scope of the technical idea of the present invention, and has the same operation and effect as described above.

[0035]

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

2) The required machine length is shortened and the roll size is reduced, so that it can be easily installed even in a small factory and the equipment cost is reduced.

3) Since the temperature drop of the material is small, not only a high-quality shaped steel with small deformation and residual stress is produced, but also the unit consumption is reduced in terms of heat and power. In addition, direct-feed rolling from a continuous casting facility becomes possible.

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

[Brief description of the drawings]

FIG. 1A is a schematic layout view of an H-beam rolling device as one embodiment of the present invention, and FIGS. 1B to 1G show materials to be rolled in each part of the device. FIG. 3 is a schematic view showing a cross section of a roll and a shape of a rolling roll.

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

FIG. 3 is a schematic layout view showing another conventional steel shape rolling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rough rolling mill group 11 Vertical mill 12 Horizontal mill 20 Finishing rolling mill group 21 · 23 Universal mill 22 Edger mill p Rolled material

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-52701 (JP, A) JP-A-4-258301 (JP, A) JP-A-56-109101 (JP, A) JP-A-58-58 90301 (JP, A) JP-A-52-88565 (JP, A) JP-B-59-1122 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 1/00-11 / 00 B21B 13/10

Claims (3)

(57) [Claims] 1. A universal mill and an edger mill, in which a beam blank is used as a material to be rolled, rough-rolled by repeatedly passing through a vertical mill and a horizontal mill, and a flange portion of the material is expanded and rolled, and a flange portion of the material. And a universal mill that rolls the steel at right angles to the web, and finish-rolls the steel by repeating the rolling. 2. The method according to claim 1, wherein the beam blank has a web thickness of 50 to 100 mm. 3. In addition to a group of rough rolling mills including a vertical mill and a horizontal mill, a universal mill having a vertical roll tapered toward an end, an edger mill for rolling down a flange end of a material with a horizontal roll, A rolling mill, comprising a finishing mill group including a universal mill having a vertical straight roll of a cylindrical shape.