JP6593457B2 - H-section steel manufacturing method and rolling device - Google Patents

Description

(Cross-reference of related applications)
This application claims priority based on Japanese Patent Application No. 2006-002066 for which it applied to Japan on January 7, 2016, and uses the content here.

  The present invention relates to a manufacturing method and a rolling device for manufacturing H-section steel using, for example, a slab having a rectangular cross section as a raw material.

  When manufacturing H-section steel, raw materials such as slabs and blooms extracted from a heating furnace are formed into a rough shape (so-called dogbone-shaped material to be rolled) by a roughing mill (BD), and intermediate universal rolling is performed. The thickness of the rough profile web and flange is reduced by a machine, and the edge reduction mill near the intermediate universal rolling mill is subjected to width reduction and forging and shaping of the flange of the material to be rolled. . And an H-section steel product is modeled by a finishing universal rolling mill.

  In such a method for manufacturing an H-shaped steel, when forming a so-called dogbone-shaped rough shape material from a slab material having a rectangular cross section, an interruption was applied to the slab end face in the first hole mold of the rough rolling process. Thereafter, a technique is known in which the interruption is extended in the second and subsequent hole molds, or the interruption depth is increased to perform edging rolling, and the interruption of the slab end face is erased in the subsequent hole molds (for example, Patent Document 1).

  Further, for example, Patent Document 2 discloses a technique in which an interruption is applied to the end face of the slab and the interruptions are gradually deepened and then expanded in a box hole type to form a flange-corresponding portion of H-shaped steel.

JP-A-7-88501 Japanese Patent Laid-Open No. 60-21101

  In recent years, with the increase in size of structures and the like, production of large H-shaped steel products has been desired. In particular, a product having a wider flange than the conventional one that greatly contributes to the strength and rigidity of the H-shaped steel is desired. In order to manufacture an H-shaped steel product having a wide flange, it is necessary to form a material to be rolled having a larger flange width than that of the prior art from modeling in the rough rolling process.

  However, for example, in the technique disclosed in Patent Document 1 described above, in the method of interrupting the end face of a material such as a slab (slab end face), edging the end face, and performing rough rolling using the width expansion, There is a limit to widening the flange. That is, in order to increase the width of the flange in the conventional rough rolling method, the width can be improved by techniques such as wedge design (interrupt angle design), reduction adjustment, and lubrication adjustment. Since it does not contribute significantly, the width expansion ratio indicating the ratio of the flange width expansion amount to the edging amount is about 0.8 even under the highest efficiency in the initial stage of edging. Under repeated conditions, it is known that the flange width decreases as the amount of expansion increases, and finally becomes about 0.5. In addition, it is conceivable to increase the edging amount of the material itself such as the slab, but there is an equipment limit on the equipment size, reduction amount, etc. of the roughing mill, so that it is not possible to realize a sufficiently wide product flange. There are circumstances.

  Further, for example, in the technique disclosed in Patent Document 2, edging rolling is immediately applied to a material such as an interrupted slab by using a box hole mold having a flat bottom surface without particularly changing the shape of the interrupt. The flange equivalent part is modeled, and in such a method, a shape defect associated with abruptly changing the shape of the material to be rolled tends to occur. In particular, the shape change of the material to be rolled in such shaping is determined by the relationship between the force of the contact portion between the material to be rolled and the roll and the bending rigidity of the material to be rolled, and has a larger flange width than conventional. When manufacturing H-section steel, there exists a problem that a shape defect tends to arise more.

  Furthermore, in recent years, various sizes (dimensions) have been desired even in products having a wider flange than conventional ones. For example, H-shaped steels having the same thickness but different flange widths are made of the same thickness. The technology of making them separately by rolls is desired.

  In view of such circumstances, the object of the present invention is to provide a deep interruption with a protrusion having an acute tip shape on the end face of a material such as a slab in a rough rolling process using a hole mold when manufacturing an H-section steel. In addition, by sequentially bending the flange portion formed thereby, the occurrence of shape defects in the material to be rolled is suppressed, and an H-shaped steel product having a larger flange width than the conventional one is manufactured efficiently and stably. An object of the present invention is to provide an H-section steel manufacturing method and a rolling device capable of separately manufacturing H-section steels having different flange widths with the same roll in an H-section steel product having a large width.

In order to achieve the above object, according to the present invention, there is provided a method for producing an H-section steel comprising a rough rolling process, an intermediate rolling process, and a finish rolling process, wherein a rolling mill that performs the rough rolling process includes: Seven or more hole molds for modeling the rolled material are engraved. In the plurality of hole molds, one or a plurality of pass moldings using a part of the plurality of hole molds are performed, and the plurality of hole molds Is a plurality of slotting hole molds provided with protrusions that interrupt vertically to the width direction of the material to be rolled, and a plurality of bendings for bending the flange-corresponding part of the material to be rolled formed by the slitting hole mold It is composed of a hole type, and the insertion hole type is composed of a three hole type for receiving three types of interrupts having different lengths, and the bending hole type has two-stage bending hole types having different bending angles. Each of the two-stage folding hole molds Placed in the hole type consists of two kinds of caliber dimension corresponding to the two flange corresponding portion of different lengths formed in the rolled material, the bending in the grooved, the material to be rolled in at least one pass or more shaped A method for producing an H-section steel is provided, in which the reduction is performed in a state where the end surface of the steel plate and the peripheral surface of the hole mold are in contact with each other.

  Each of the plurality of bending hole molds may be provided with a protrusion that bends the flange corresponding part by pressing against the flange corresponding part formed by the insertion hole mold.

  The tip angles of the protrusions provided in the plurality of the insertion hole molds may be 25 ° or more and 40 ° or less.

  In the plurality of bending hole molds, each of the hole molds having dimensions corresponding to two types of flange-corresponding portions having different lengths is provided in two stages with a configuration in which two types of protrusions having different tip angles are provided. Of the bent hole molds provided in the two steps, the tip angle of the projection of one hole mold is 70 ° or more and 110 ° or less, and the tip angle of the other projection is 130 ° or more and 170 ° or less. May be.

  The rough rolling step is performed in a sizing mill and a rough rolling mill, and a plurality of the insertion hole molds and a plurality of the bending hole molds are engraved in a roll of the sizing mill. Of the bending hole molds, the latter stage hole molds may be engraved on the roll of the rough rolling mill.

  The rough rolling step is performed in one rough rolling mill, and the shaping by the front hole mold among the plurality of interrupt hole molds and the plurality of bending hole molds is performed in the first heat of the rough rolling mill. Of the plurality of bending hole molds, the second hole mold may be formed in the second heat of the rough rolling mill.

  H-shaped steels having the same thickness and different widths, the same web height, and different flange widths may be manufactured.

According to the present invention from another point of view, it is a rolling device that performs a rough rolling process in the manufacture of H-section steel, and is formed with seven or more hole molds that perform one or multiple pass modeling of a material to be rolled, The plurality of hole molds include a plurality of insertion hole molds provided with projections that interrupt vertically to the width direction of the material to be rolled, and a flange-corresponding portion of the material to be rolled formed by the hole insertion mold. Is formed of a plurality of folding hole molds, and the interrupting hole mold includes a three hole mold for receiving three types of interrupts having different lengths, and the folding hole mold is a two-stage folding hole mold having different folding angles. Each of these two-stage bending hole molds is composed of two types of hole molds having dimensions corresponding to two types of flange-corresponding portions having different lengths formed in the rolled material in the above-described split hole mold. the folding hole type, And having a structure in which the end face and the grooved peripheral surface of the rolled material is contacted in the shaping of more than one pass even without rolling apparatus is provided.

  Each of the plurality of bending hole molds may be provided with a protrusion that bends the flange corresponding part by pressing against the flange corresponding part formed by the insertion hole mold.

  The tip angles of the protrusions provided in the plurality of the insertion hole molds may be 25 ° or more and 40 ° or less.

  In the plurality of bending hole molds, each of the hole molds having dimensions corresponding to two types of flange-corresponding portions having different lengths is provided in two stages with a configuration in which two types of protrusions having different tip angles are provided. Of the bent hole molds provided in the two steps, the tip angle of the projection of one hole mold is 70 ° or more and 110 ° or less, and the tip angle of the other projection is 130 ° or more and 170 ° or less. May be.

  It comprises a sizing mill and a rough rolling mill, and a front hole type of the plurality of insertion hole molds and the plurality of bending hole molds is engraved in a roll of the sizing mill, The latter stage die may be engraved on the roll of the rough rolling mill.

  According to the present invention, in the rough rolling process using the hole mold when manufacturing the H-section steel, the end face of the material such as the slab is deeply interrupted by the protrusion portion having an acute tip shape, and thereby formed. By bending the flange part sequentially, the occurrence of shape defects in the material to be rolled is suppressed, and H-shaped steel products with a larger flange width than conventional products are manufactured efficiently and stably, and H-shaped steel products with a larger flange width are produced. In this case, H-shaped steels having different flange widths can be separately produced with the same roll.

It is a schematic explanatory drawing about the production line of H-section steel. It is a schematic explanatory drawing of a 1st hole type | mold. It is a schematic explanatory drawing of a 2-1 hole type | mold. It is a schematic explanatory drawing of the 2-2 hole type | mold. It is a schematic explanatory drawing of a 3rd-1 hole type | mold. It is a schematic explanatory drawing of a 3-2 hole type | mold. It is a schematic explanatory drawing of a 4th-1 hole type | mold. It is a schematic explanatory drawing of a 4-2 hole type | mold.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is an explanatory diagram of an H-section steel production line T including a rolling facility 1 according to the present embodiment. As shown in FIG. 1, a heating furnace 2, a sizing mill 3, a roughing mill 4, an intermediate universal rolling mill 5, and a finishing universal rolling mill 8 are arranged in order from the upstream side on the production line T. Further, an edger rolling mill 9 is provided in the vicinity of the intermediate universal rolling mill 5. In the following description, the steel materials in the production line T will be collectively referred to as “rolled material A” for the sake of explanation, and the shape may be appropriately illustrated using broken lines, diagonal lines, etc. in each drawing.

  As shown in FIG. 1, in the production line T, a material A to be rolled such as a slab 11 extracted from the heating furnace 2 is roughly rolled in a sizing mill 3 and a roughing mill 4. Next, intermediate rolling is performed in the intermediate universal rolling mill 5. During the intermediate rolling, the edger rolling machine 9 applies a reduction to the end of the material to be rolled (flange corresponding portion 12) as necessary. Usually, the rolls of the sizing mill 3 and the roughing mill 4 are engraved with about 4 to 6 hole shapes in total, and the H-shaped rough profile is formed by reverse rolling in a plurality of passes via these. 13 is formed, and the H-shaped rough material 13 is subjected to a plurality of passes of rolling by using a rolling mill row composed of two rolling mills of the intermediate universal rolling mill 5-edger rolling mill 9. Modeled. Then, the intermediate material 14 is finish-rolled into a product shape in the finish universal rolling mill 8 to produce an H-section steel product 16.

  Next, the hole configuration and the hole shape formed in the sizing mill 3 and the roughing mill 4 shown in FIG. 1 will be described with reference to the drawings. In addition, in addition to the 1st hole type-4th hole type demonstrated below, the rough rolling mill 4 usually uses the so-called dogbone-shaped H-shaped rough shape material for the material A to be rolled. A hole type 13 is further provided. Since this hole type is already known, illustration and description in this specification will be omitted. The heating furnace 2, the intermediate universal rolling mill 5, the finishing universal rolling mill 8, the edger rolling mill 9 and the like in the production line T are general apparatuses conventionally used for manufacturing H-section steel. Since the configuration and the like are known, the description is omitted in this specification.

  2-8 is a schematic explanatory drawing about the hole type | mold engraved in the sizing mill 3 and the rough rolling mill 4 which perform a rough rolling process. Here, the 1st hole type-the 4th hole type to explain may be all engraved in the sizing mill 3, for example, and the 1st hole type-the 4th hole type are divided into the sizing mill 3 and the rough rolling mill 4. It may be engraved. That is, the first hole type to the fourth hole type may be engraved over both the sizing mill 3 and the rough rolling mill 4, or may be engraved in either one of the rolling mills. In the rough rolling process in the manufacture of normal H-section steel, modeling is performed in one or a plurality of passes in each of these perforations.

  In the present embodiment, the second hole type, the third hole type, and the fourth hole type are configured by two types of hole types having different dimensional shapes, and the second hole type includes the second-1 hole type and the second hole type. The -2 hole type and the third hole type are the 3-1 hole type and the 3-2 hole type, and the fourth hole type is the 4-1 hole type and the 4-2 hole type. 2 to 5, the approximate final path shape of the material A to be rolled at the time of shaping in each hole mold is illustrated by a broken line.

  FIG. 2 is a schematic explanatory view of the first hole mold K1. The first hole mold K1 is engraved in the upper hole roll 20 and the lower hole roll 21 which are a pair of horizontal rolls, and the material A to be rolled is placed in the roll gap between the upper hole roll 20 and the lower hole roll 21. Reduced and shaped. Further, on the peripheral surface of the upper hole type roll 20 (that is, the upper surface of the first hole type K1), a protruding portion 25 that protrudes toward the inside of the hole type is formed. Further, a projection 26 is formed on the peripheral surface of the lower hole roll 21 (that is, the bottom surface of the first hole mold K1) protruding toward the inside of the hole mold. These projecting portions 25 and 26 have a tapered shape, and the projecting length and other dimensions are equal between the projecting portion 25 and the projecting portion 26. The height (projection length) of the protrusions 25 and 26 is h1, and the tip angle is θ1a.

In the first hole mold K1, the protrusions 25 and 26 are pressed against the upper and lower ends (slab end surfaces) of the material A to be rolled, and interrupts 28 and 29 are formed. Here, the tip end angle (also referred to as wedge angle) θ1a of the protrusions 25 and 26 is preferably, for example, 25 ° or more and 40 ° or less.
The lower limit of the wedge angle is usually determined by the strength of the roll. When the material A to be rolled comes into contact with the rolls (the upper hole type roll 20 and the lower hole type roll 21 in the first hole mold K1), the roll expands due to the heat received between them, and the roll is released when the material A is separated from the roll. It cools and shrinks. These cycles are repeated during modeling, but if the wedge angle is too small, the heat input from the material to be rolled A is affected by the protrusions (the protrusions 25 and 26 in the first hole mold K1) are thin. It becomes easy to enter from the left and right of the part, and the roll is likely to be hotter. When the roll becomes high temperature, the thermal fluctuation width increases, so that heat cracks may occur and roll breakage may occur.
On the other hand, when the wedge angle is increased, deformation due to widening occurs during the formation of interruptions in each hole type (interruptions 28 and 29 in the first hole type K1), and in particular in modeling after the second hole type K2 described below. The generation efficiency of the flange decreases.
From the above viewpoint, as a result of intensive analysis and evaluation by the present inventors, the range of the wedge angle θ1a is preferably 25 ° or more and 40 ° or less in the hole configuration according to the present embodiment.

  Here, the hole width of the first hole mold K1 is preferably substantially equal to the thickness of the material A to be rolled (that is, the slab thickness). Specifically, by making the hole mold width and the slab thickness the same at the tips of the protrusions 25 and 26 formed in the first hole mold K1, the right and left centering property of the material to be rolled A is suitably secured. Is done. Moreover, by setting it as such a hole-type dimension, as shown in FIG. 2, at the time of modeling in the 1st hole type | mold K1, in the upper-lower-end part (slab end surface) of the to-be-rolled material A, the said protrusion The first holes are formed on the upper and lower ends of the slabs, which are partly in contact with the material A to be rolled, and divided into four elements (parts) by interruptions 28 and 29. It is preferable that no positive reduction is performed on the top and bottom surfaces of the mold K1. This is because the reduction by the upper and bottom surfaces of the hole mold causes the material A to be elongated in the longitudinal direction, thereby reducing the generation efficiency of the flange (a flange portion 100 described later). That is, in the first hole type K1, the protrusions 25 and 26 are pressed against the upper and lower ends (slab end surfaces) of the material A to be rolled, and the reduction in the protrusions 25 and 26 when the interrupts 28 and 29 are formed. The amount (wedge tip reduction amount ΔT) is sufficiently larger than the reduction amount (slab end surface reduction amount ΔE) at the upper and lower ends of the slab, whereby interrupts 28 and 29 are formed.

  FIG. 3 is a schematic explanatory diagram of the second hole mold K2-1. The 2nd hole type | mold K2-1 is engraved by the upper hole type | mold roll 30 and the lower hole type | mold roll 31 which are a pair of horizontal rolls. On the peripheral surface of the upper hole type roll 30 (that is, the upper surface of the second hole type K2-1), a protruding portion 35 that protrudes toward the inside of the hole type is formed. Further, a projection 36 that protrudes toward the inside of the hole mold is formed on the peripheral surface of the lower hole roll 31 (that is, the bottom surface of the second hole mold K2-1). These projecting portions 35 and 36 have a tapered shape, and the projecting length and other dimensions are configured to be equal between the projecting portion 35 and the projecting portion 36. It is desirable that the tip end angle of the projections 35 and 36 is a wedge angle θ1b of 25 ° or more and 40 ° or less.

  Further, the height (projection length) h2 of the projections 35 and 36 is higher than the height h1 of the projections 25 and 26 of the first hole mold K1, and h2> h1. Here, as described above, the tip angle (wedge angle θ1b) of the projections 35 and 36 is the same as the tip angle of the projections 25 and 26 of the first hole mold K1 (that is, θ1a = θ1b). It is preferable.

Here, the height h2 of the protrusions 35 and 36 formed in the second hole mold K2-1 is higher than the height h1 of the protrusions 25 and 26 formed in the first hole mold K1, and the to-be-rolled Similarly, the length of penetration into the upper and lower end portions (slab end surfaces) of the material A is longer in the second hole type K2-1. The penetration depth of the protrusions 35 and 36 into the material to be rolled A in the second hole mold K2-1 is the same as the height h2 of the protrusions 35 and 36. That is, the penetration depth h1 ′ of the projections 25 and 26 in the first hole mold K1 and the penetration depth h1 ′ of the projections 35 and 36 in the second hole mold K2-1 into the material A to be rolled. The depth h2 has a relationship of h1 ′ <h2.
Further, an angle θf formed by the hole top surfaces 30a and 30b and the hole bottom surfaces 31a and 31b facing the upper and lower ends (slab end surfaces) of the material A to be rolled and the inclined surfaces of the projections 35 and 36 is shown in FIG. The four locations shown are each configured at about 90 ° (substantially at right angles).

As shown in FIG. 3, since the intrusion length of the protruding portion when pressed against the upper and lower end portions (slab end surfaces) of the material A is long, in the second hole type K2-1, the first hole Modeling is performed so that the interrupts 28 and 29 formed in the mold K1 become deeper, and interrupts 38 and 39 are formed.
In addition, the modeling with the second hole mold K2-1 is performed by multiple passes. In the multi-pass modeling, the upper and lower ends (slab end surfaces) of the material A to be rolled and the holes facing it in the final pass. Modeling is performed such that the mold upper surfaces 30a and 30b and the hole mold bottom surfaces 31a and 31b come into contact with each other. This is because when the upper and lower ends of the material to be rolled A and the inside of the hole mold are not in contact with each other in the second hole mold K2-1, the flange-corresponding portion (flange portion 100 described later) is shaped asymmetrically. This is because there is a risk that a defective shape will occur, and there is a problem in terms of material permeability.

  FIG. 4 is a schematic explanatory diagram of the second hole type K2-2. The second hole mold K2-2 is engraved in the upper hole roll 40 and the lower hole roll 41 which are a pair of horizontal rolls. On the peripheral surface of the upper hole type roll 40 (that is, the upper surface of the second hole type K2-2), a protruding portion 45 that protrudes toward the inside of the hole type is formed. Further, a projection 46 is formed on the peripheral surface of the lower hole type roll 41 (that is, the bottom surface of the second hole type K2-2) protruding toward the inside of the hole type. These protrusions 45 and 46 have a tapered shape, and the protrusions 45 and the like have the same length, such as the protrusion 45 and the protrusion 46 of the second hole mold K2-1.

The shapes of the protrusions 45 and 46 are similar to the shapes of the protrusions 35 and 36 of the second hole mold K2-1, and the tip angle is a wedge angle of 25 ° to 40 °. θ1b. In addition, the height h2 ′ of the protrusions 45 and 46 is higher than the height h2 of the protrusions 35 and 36 (that is, h2 <h2 ′).
Further, an angle θf formed by the hole top surfaces 40a and 40b and the hole bottom surfaces 41a and 41b facing the upper and lower ends (slab end surfaces) of the material A to be rolled and the inclined surfaces of the protrusions 45 and 46 is shown in FIG. The four locations shown are each configured at about 90 ° (substantially at right angles).

As shown in FIG. 4, the intrusion lengths of the protrusions 45 and 46 when pressed against the upper and lower ends (slab end surfaces) of the material A to be rolled are the first hole type K1 and the second hole type K2-1. Therefore, deeper interrupts 48 and 49 are formed in the second hole type K2-2.
In addition, the modeling with the second hole mold K2-2 is performed by multiple passes. In the multi-pass modeling, the upper and lower ends (slab end surfaces) of the material A to be rolled and the holes facing it in the final pass. Modeling is performed such that the mold upper surfaces 40a and 40b and the hole mold bottom surfaces 41a and 41b come into contact with each other. This is because when the upper and lower ends of the material to be rolled A and the inside of the hole mold are not in contact with each other in the second hole mold K2-2, the flange-corresponding portion (flange portion 100 described later) is shaped asymmetrically. This is because there is a risk that a defective shape will occur, and there is a problem in terms of material permeability.

  These second hole molds K2-1 and K2-2 can be selectively used as necessary. For example, the material A to be rolled after passing through the first hole mold K1 is used only for the second hole mold K2-1. The case where modeling is performed by passing through the material and the case where modeling is performed by passing through both the second hole type K2-1 and the second hole type K2-2 are considered. Note that FIG. 3 shows a case where an H-shaped rough shaped material with a short flange piece width of a flange corresponding portion (a portion corresponding to a flange portion 100 described later) is formed by passing only through the second hole mold K2-1. The shape of the material to be rolled is shown. In FIG. 4, a material having a larger slab width (different material cross-section) than that shown in FIG. 3 is used, and the second hole type K2-1 and the second hole type K2-2 are used. The shape of a to-be-rolled material is shown in the case where an H-shaped rough shaped material having a long flange piece width at a flange corresponding portion (a portion corresponding to a flange portion 100 described later) is formed. When the flange piece width of the flange corresponding part (part corresponding to the flange part 100 to be described later) formed by interrupting the upper and lower end parts (slab end face) of the material A to be rolled is short by using properly in this way. Modeling can be carried out separately for long cases. That is, by using these two hole molds (second hole molds K2-1 and K2-2), two types of flanges can be obtained from the same slab thickness and H-shaped steel as the final product from materials with different widths. Modeling for manufacturing products with different widths can be performed.

As described above, the slabs used as a material have the same thickness when the molding is performed separately when the flange piece width of the flange corresponding portion (the portion corresponding to the flange portion 100 described later) is short or long. , Materials with different widths (slab widths). Therefore, when performing modeling by passing only the second hole mold K2-1 described above, a material having a short slab width is used, and both the second hole mold K2-1 and the second hole mold K2-2 are used. When modeling by letting the material pass, modeling can be performed separately when the flange piece width is short (see FIG. 3) and when the flange piece width is long (see FIG. 4). .
In addition, since the 1st hole type | mold K1 demonstrated above and the 2nd hole type | molds K2-1 and K2-2 make an interruption form in the upper-lower-end part (slab end surface) of the material A to be rolled, Also called a mold.

  FIG. 5 is a schematic explanatory diagram of the third hole mold K3-1. The third hole type K3-1 is engraved in the upper hole type roll 50 and the lower hole type roll 51 which are a pair of horizontal rolls. On the peripheral surface of the upper hole type roll 50 (that is, the upper surface of the third hole type K3-1), a protruding portion 55 that protrudes toward the inside of the hole type is formed. Further, a projection 56 that protrudes toward the inside of the hole mold is formed on the peripheral surface of the lower hole roll 51 (that is, the bottom surface of the third hole mold K3-1). These projecting portions 55 and 56 have a tapered shape, and the projecting length and other dimensions are configured to be equal between the projecting portion 55 and the projecting portion 56.

The tip angle θ2 of the protrusions 55 and 56 is configured to be wider than the angle θ1b, and the penetration depth h3 of the protrusions 55 and 56 into the material to be rolled A is that of the second hole mold K2-1. The intrusion depth h2 of the protrusions 35 and 36 is shorter (that is, h3 <h2).
Further, an angle θf formed by the hole top surfaces 50a and 50b and the hole bottom surfaces 51a and 51b facing the upper and lower ends (slab end surfaces) of the material A to be rolled and the inclined surfaces of the protrusions 55 and 56 is shown in FIG. The four locations shown are each configured at about 90 ° (substantially at right angles).

  As shown in FIG. 5, in the 3rd hole type | mold K3-1, it is the 2nd hole in the upper and lower end part (slab end surface) of the material A to be rolled with respect to the material A to be rolled after passing the 2nd hole type K2-1. The interrupts 38 and 39 formed in the mold K2-1 become interrupts 58 and 59 when the protrusions 55 and 56 are pressed against each other. That is, in the final pass in modeling with the third hole mold K3-1, the deepest part angle of the interrupts 58 and 59 (hereinafter also referred to as the interrupt angle) is θ2. In other words, in the second hole type K2-1, modeling is performed such that a divided part (part corresponding to a flange part 100 described later) formed with the interruptions 38 and 39 is bent outward.

  In addition, the modeling with the third hole mold K3-1 is performed by at least one pass, and in the modeling, the upper and lower end portions (slab end surfaces) of the material A to be rolled and the hole molds opposed thereto in the final pass. Modeling is performed such that the upper surfaces 50a and 50b and the hole bottom surfaces 51a and 51b come into contact with each other. This is because when the upper and lower ends of the material to be rolled A and the inside of the hole mold are not in contact with each other in the third hole mold K3-1, the flange-corresponding portion (flange portion 100 described later) is shaped asymmetrically. This is because there is a risk that a defective shape will occur, and there is a problem in terms of material permeability.

  FIG. 6 is a schematic explanatory diagram of the third hole mold K3-2. The third hole mold K3-2 is engraved in the upper hole roll 60 and the lower hole roll 61, which are a pair of horizontal rolls. On the peripheral surface of the upper hole type roll 60 (that is, the upper surface of the third hole type K3-2), a protruding portion 65 that protrudes toward the inside of the hole type is formed. Furthermore, a projection 66 that protrudes toward the inside of the hole mold is formed on the peripheral surface of the lower hole roll 61 (that is, the bottom surface of the third hole mold K3-2). These protrusions 65 and 66 have a tapered shape, and the protrusion 65 and the protrusion 66 are configured to have the same dimensions such as the protrusion length.

  Further, the shape of the projections 65 and 66 is similar to the shape of the projections 55 and 56 of the third hole mold K3-1, the tip end angle is the wedge angle θ2, and the projection 65 , 66 is configured to be higher than the height h3 of the protrusions 55 and 56 (that is, h3 <h3 ′). Further, an angle θf formed by the hole top surfaces 60a and 60b and the hole bottom surfaces 61a and 61b facing the upper and lower ends (slab end surfaces) of the material A to be rolled and the inclined surfaces of the protrusions 65 and 66 is shown in FIG. The four locations shown are each configured at about 90 ° (substantially at right angles).

  As shown in FIG. 6, in the 3rd hole type | mold K3-2, it is 2nd hole in the upper and lower end part (slab end surface) of the to-be-rolled material A with respect to the to-be-rolled material A after 2nd hole type | mold K2-2 passing material. Interruptions 48 and 49 formed in the mold K2-2 become interrupts 68 and 69 when the projections 65 and 66 are pressed. That is, in the final pass in modeling with the third hole mold K3-2, the deepest part angle of the interrupts 68 and 69 (hereinafter also referred to as the interrupt angle) is θ2. In other words, in the second hole type K2-2, modeling is performed such that a divided part (part corresponding to a flange part 100 to be described later) formed along with the formation of the interrupts 48 and 49 is bent outward.

  Further, the modeling with the third hole mold K3-2 is performed by at least one pass, and in the modeling, the upper and lower end portions (slab end surfaces) of the material A to be rolled and the hole molds facing the same in the final pass. Modeling is performed such that the upper surfaces 60a and 60b and the hole bottom surfaces 61a and 61b come into contact with each other. This is because when the upper and lower ends of the material to be rolled A and the inside of the hole mold are not in contact with each other in the third hole mold K3-2, the flange-corresponding portion (flange portion 100 described later) is shaped asymmetrically. This is because there is a risk that a defective shape will occur, and there is a problem in terms of material permeability.

The third hole mold K3-1 and the third hole mold K3-2 described with reference to FIG. 5 and FIG. 6 are both divided parts (parts corresponding to a flange part 100 described later) formed by interruption on the outside. Although it is a hole type for bending, the third hole type K3-1 is used to form the material A to be rolled using only the second hole type K2-1 as the previous hole type. On the other hand, the third hole mold K3-2 is formed on the material A to be rolled formed using the second hole molds K2-1 and K2-2 as the previous hole mold. .
That is, when manufacturing two types of products having different flange widths with the same roll chance, the third hole mold K3-1 is used when manufacturing a product with a short flange width, and the third hole mold K3-2 is used. Is used when manufacturing products with a long flange width. Of course, as can be seen by comparing FIG. 5 and FIG. 6, the third hole mold K3-2 was formed rather than the flange equivalent part (flange section 100 described later) formed by the third hole mold K3-1. The flange-corresponding portion (flange portion 100 described later) is shaped so that the flange piece width is longer.

The interrupt angle θ2 of the third hole molds K3-1 and K3-2 is desirably set to, for example, 70 ° to 110 °. When the interrupt angle θ2 is less than 70 ° or more than 110 °, there is a risk of deformation imbalance of the left and right flange portions 80 and a shape defect such that the outer surface of the flange portion 80 is crushed. In the dog-bone-shaped modeling in the known flat modeling hole mold, there is a possibility that a shape defect such that the center portion of the outer surface of the flange portion 80 becomes a meat accumulation shape and product defects occur.
From the above viewpoint, as a result of intensive analysis and evaluation by the present inventors, it is desirable that the range of the interrupt angle θ2 is 70 ° or more and 110 ° or more in the hole configuration according to the present embodiment.

  FIG. 7 is a schematic explanatory diagram of the fourth hole type K4-1. The fourth hole type K4-1 is engraved in the upper hole type roll 70 and the lower hole type roll 71 which are a pair of horizontal rolls. On the peripheral surface of the upper hole type roll 70 (that is, the upper surface of the fourth hole type K4-1), a protrusion 75 protruding toward the inside of the hole type is formed. Further, a projection 76 that protrudes toward the inside of the hole mold is formed on the peripheral surface of the lower hole roll 71 (that is, the bottom surface of the fourth hole mold K4-1). The protrusions 75 and 76 have a tapered shape, and the protrusion 75 and the protrusion 76 are configured to have the same dimensions such as the protrusion length.

The tip end angle θ3 of the projections 75 and 76 is configured to be wider than the angle θ2, and the penetration depth h4 of the projections 75 and 76 into the rolled material A is the penetration depth of the projections 55 and 56. The length is shorter than h3 (that is, h4 <h3).
Further, an angle θf formed between the upper surface 70a, 70b and the lower surface 71a, 71b of the mold mold facing the upper and lower ends (slab end surfaces) of the material A to be rolled and the inclined surfaces of the protrusions 75, 76 is shown in FIG. The four locations shown are each configured at about 90 ° (substantially at right angles).

  As shown in FIG. 7, in the 4th hole type | mold K4-1, with respect to the to-be-rolled material A after the 3rd hole type | mold K3-1 passage, the 3rd hole is in the upper and lower end part (slab end surface) of the to-be-rolled material A. The interruptions 58 and 59 formed in the mold K3-1 become interruptions 78 and 79 by the protrusions 75 and 76 being pressed. That is, in the final pass in modeling with the fourth hole mold K4-1, the deepest part angle of the interrupts 78 and 79 (hereinafter also referred to as the interrupt angle) is θ3. In other words, modeling is performed such that the divided part (part corresponding to the flange portion 100 described later) that is modeled together with the formation of the interrupts 58 and 59 in the third hole mold K3-1 is bent outward.

  In addition, the modeling with the fourth hole mold K4-1 is performed by at least one pass, and in the modeling, the upper and lower end portions (slab end surfaces) of the material A to be rolled and the hole molds opposed thereto in the final pass. Modeling is performed such that the upper surfaces 70a and 70b and the hole bottom surfaces 71a and 71b come into contact with each other. This is because when the upper and lower ends of the material to be rolled A and the inside of the hole mold are not in contact with each other in the fourth hole mold K4-1, the flange-corresponding portion (flange portion 100 described later) is shaped asymmetrically. This is because there is a risk that a defective shape will occur, and there is a problem in terms of material permeability.

  FIG. 8 is a schematic explanatory diagram of the fourth hole type K4-2. The fourth hole mold K4-2 is engraved in an upper hole roll 80 and a lower hole roll 81 which are a pair of horizontal rolls. On the peripheral surface of the upper hole type roll 80 (that is, the upper surface of the fourth hole type K4-2), a protrusion 85 protruding toward the inside of the hole type is formed. Furthermore, a projection 86 is formed on the peripheral surface of the lower hole type roll 81 (that is, the bottom surface of the fourth hole type K4-2) protruding toward the inside of the hole type. The protrusions 85 and 86 have a tapered shape, and the protrusions 85 and the protrusions 66 have the same dimensions such as the protrusion length.

  Further, the shape of the protrusions 85 and 86 is similar to the shape of the protrusions 75 and 76 of the fourth hole type K4-1, the tip end angle is also the wedge angle θ3, and the protrusion 85 , 86 is configured to be higher than the height h4 of the protrusions 75 and 76 (that is, h4 <h4 ′). Further, the angle θf formed between the upper surface 80a, 80b and the lower surface 81a, 81b of the mold mold facing the upper and lower ends (slab end surfaces) of the material A to be rolled and the inclined surfaces of the projections 85, 86 is shown in FIG. The four locations shown are each configured at about 90 ° (substantially at right angles).

  As shown in FIG. 8, in the 4th hole type | mold K4-2, with respect to the to-be-rolled material A after 3rd hole type | mold K3-2 passing material, the 3rd hole is in the upper and lower end part (slab end surface) of the to-be-rolled material A. The interrupts 68 and 69 formed in the mold K3-2 become interrupts 88 and 89 when the projections 85 and 86 are pressed against each other. That is, in the final pass in the modeling with the fourth hole mold K4-2, the deepest part angle of the interrupts 88 and 89 (hereinafter also referred to as the interrupt angle) is θ3. In other words, modeling is performed such that the divided part (part corresponding to the flange part 100 described later) which is modeled with the formation of the interrupts 68 and 69 in the third hole mold K3-2 is bent outward. The parts of the upper and lower ends of the material A to be rolled thus formed are parts corresponding to the flanges of the subsequent H-shaped steel product, and are referred to as flange parts 100 here.

  In addition, the modeling with the fourth hole mold K4-2 is performed by at least one pass, and in the modeling, the upper and lower end portions (slab end surfaces) of the material A to be rolled and the hole molds opposed thereto in the final pass. Modeling is performed such that the upper surfaces 80a and 80b and the hole bottom surfaces 81a and 81b come into contact with each other. This is because when the upper and lower ends of the material to be rolled A and the inside of the hole mold are not in contact with each other in the fourth hole mold K4-2, a shape defect such that the flange section 100 is shaped asymmetrically occurs. This is because there is a fear and there is a problem in terms of material permeability.

  The interrupt angle θ3 of the fourth hole types K4-1 and K4-2 is preferably set to an angle slightly smaller than 180 °, and is preferably set to 130 ° to 170 °, for example. This is because if the interrupt angle θ3 is set to 180 °, when the web thickness is reduced in the next step of the flat shaping hole mold, the outer side of the flange portion 100 expands, and in the rolling with the flat shaping hole mold, This is because the protrusion is likely to occur. That is, since the amount of expansion on the outside of the flange portion 100 is determined according to the shape of the flat shaping hole mold and the web thickness reduction in the next process, the interrupt angle θ3 here is the shape and web thickness of the flat shaping hole mold. It is desirable that the amount is suitably determined in consideration of the amount of reduction.

The fourth hole mold K4-1 and the fourth hole mold K4-2 described with reference to FIG. 7 and FIG. 8 are holes for folding outward the divided part (the rear flange part 100) formed by interruption. Although it is a type | mold, while the 4th hole type K4-1 is what shape | molds with respect to the to-be-rolled material A shape | molded using the 3rd hole type | mold K3-1 as a hole type | mold of a previous step, The 4th hole type K4-2 performs modeling with respect to the to-be-rolled material A shape | molded using the 3rd hole type K3-2 as a hole type | mold of the previous step.
That is, when manufacturing two types of products with different flange widths with the same roll chance, the fourth hole mold K4-1 is used when manufacturing a product with a short flange width, and the fourth hole mold K4-2. Is used when manufacturing products with a long flange width. Of course, as can be seen by comparing FIG. 7 and FIG. 8, the flange portion 100 formed with the fourth hole mold K4-2 is more than the flange section 100 formed with the fourth hole mold K4-1. It is shaped so that the flange piece width becomes long.
The third hole molds K3-1 and K3-2 and the fourth hole molds K4-1 and K4-2 described above are divided parts (rear parts) formed at the upper and lower ends (slab end surfaces) of the material A to be rolled. The flange portion 100) is bent outward so that it is also called a folding hole type.

  For the material A to be rolled formed by the first hole mold K1 to the fourth hole molds K4-1 and K4-2 described above, further reduction and modeling are performed using a known hole mold (flat shaped hole mold). In other words, the H-shaped rough member 13 having a so-called dogbone shape is formed. Usually, after this, the web thickness is reduced by a flat shaping hole mold which reduces the thickness corresponding to the slab thickness. Thereafter, using a rolling mill row composed of two rolling mills of the intermediate universal rolling mill 5-edger rolling mill 9 shown in FIG. Then, the intermediate material 14 is finish-rolled into a product shape in the finish universal rolling mill 8 to produce an H-section steel product 16.

  In the rolling modeling in the first hole mold K1 to the fourth hole molds K4-1 and K4-2 of the H-shaped rough shape member 13, the flange portion 100 is formed from slab materials having the same thickness and different widths. A process for manufacturing two types of H-shaped steel products having different half widths will be briefly described below. Specifically, a first H-shaped steel product (narrow product) with a flange piece width L1 and a second H-shaped steel product (wide product) with a flange piece width L2 (> L1) are manufactured. The modeling of the H-shaped rough shape material will be described.

  First, interruptions 28 and 29 are formed on the upper and lower ends of the slab material 11 extracted from the heating furnace 2 in the first hole mold K1 (see FIG. 2). Subsequently, in the second hole mold K2-1, modeling is performed to deepen the interrupts 28 and 29, and interrupts 38 and 39 are formed. The processes in the first hole mold K1 and the second hole mold K2-1 are performed in common for the first H-shaped steel product and the second H-shaped steel product (see FIG. 3). At this time, the thickness of the slab material 11 used is the same for both, but the slab width is longer for the material corresponding to the second H-shaped steel product.

In the production of the first H-shaped steel product, the material A to be rolled is shaped by the third hole mold K3-1, the interrupts 38 and 39 are expanded, and the divided parts are shaped with the formation of the interrupts 58 and 59. (A part corresponding to a flange part 100 described later) is bent outward (see FIG. 5). And the to-be-rolled material A is further shape | molded in the 4th hole type | mold K4-1 after shaping | molding in the 3rd hole type | mold K3-1, and the division | segmentation site | part (flange part 100 mentioned later) shape | molded with interruption 78 and 79 formation. Are further bent outward (see FIG. 7).
Here, the flange piece width L1 of the first H-shaped steel product depends on the piece width of the flange-corresponding portion formed together with the formation of the interrupts 38 and 39 in the second hole mold K2-1.

On the other hand, in the manufacture of the second H-shaped steel product, after shaping the upper and lower end surfaces of the material A to be rolled formed with the second hole shape K2-1, the material A to be rolled is the second hole shape K2-. At 2, modeling is performed to deepen the formed interrupts 38 and 39 to form interrupts 48 and 49 (see FIG. 4). Then, the material to be rolled A is further shaped in the third hole mold K3-2 after being shaped in the second hole mold K2-2, the interrupts 48 and 49 are expanded, and are shaped with the formation of the interrupts 68 and 69. The divided part (part corresponding to the flange portion 100 described later) is bent outward (see FIG. 6). Subsequently, the material A to be rolled is further shaped in the fourth hole mold K4-2 after being shaped in the third hole mold K3-2, and is divided with the formation of the interrupts 88 and 89 (the flange portion described later). The portion corresponding to 100) is further bent outward (see FIG. 8).
Here, the flange piece width L2 of the second H-shaped steel product depends on the piece width of the flange-corresponding portion that is formed together with the formation of the interrupts 48 and 49 in the second hole mold K2-2.

  As described above, the two types of H-shaped rough shapes formed in this manner have different flange piece widths at L1 and L2. On the other hand, in the width of the H-shaped rough shape, the width of the portion corresponding to the web is substantially equal. By shaping the H-shaped rough shape material with such a configuration, two types of H-shapes can be formed with the same roll chance in the rolling shaping by the intermediate universal rolling mill 5-edger rolling mill 9 and the finishing universal rolling mill 8 at the subsequent stage. It is possible to carry out rolling shaping of a rough shaped material.

Table 1 shows the first H-section steel product (narrow product) whose flange piece width is L1 and the second H-section steel product (wide product) whose flange piece width is L2 (> L1). It is the table | surface which put together the modeling process of the H-shaped rough shape material in the case of manufacturing. In addition, the hole type names G1 to G4-2 in Table 1 correspond to the first hole type K1 to the fourth hole type K4-2, and the stand No. is divided into two rolling mills for engraving the hole type. The description of the first and second times is divided into two roll chances in order to compensate for the shortage of the roll body length when there is only one rolling stand for rough rolling. An example of the rolling hole shape and the order in the case of carrying out operation by heating with two heats is shown.
The numbers 1 to 4 for the first H-shaped steel product (narrow product) and the numbers 1 to 5 for the second H-shaped steel product (wide product) indicate the hole types to be passed and their order. ing.

  By the modeling process as shown in Table 1, the first H-shaped steel product (narrow product) and the second H-shaped steel product (wide product) are produced separately. In addition, as described in Table 1 and the description in the present embodiment, when the first H-section steel product (narrow product) and the second H-section steel product (wide product) are separately manufactured, the second hole Type 2-1 (G2-1 in the table) is used in both products. This is because when the interrupts 28 and 29 formed at the upper and lower ends of the material A to be rolled are further deepened in the first hole mold K1, the flange-corresponding portion does not cause unevenness in the left and right, poor material passing, etc. This is to form an interrupt stably. In particular, when manufacturing an H-shaped steel product having a large flange width such as a flange width of 300 mm or more, for example, the shape of the flange equivalent portion is corrected once before the flange equivalent portion is shaped unevenly. Therefore, by using the second hole mold 2-1, the formation of a stable flange-corresponding portion and the formation of an interrupt are performed.

  As described above, the upper and lower ends (slab end surfaces) of the material A to be rolled are interrupted using the first hole mold K1 to the fourth hole mold K4-2 according to the present embodiment, and divided into right and left by these interrupts. Forming the H-shaped rough shape member 13 without rolling down the upper and lower end surfaces of the material A (slab) to be rolled by forming the flange portion 100 by performing a process of bending each portion left and right. It can be performed. That is, compared with the conventional rough rolling method in which the end face of the slab is always squeezed, the flange width can be widened to form the H-shaped rough shape 13, and as a result, a final product having a large flange width ( H-shaped steel) can be manufactured.

  Furthermore, in the modeling method using the first hole mold K1 to the fourth hole mold K4-2, for example, as shown in Table 1, the third hole mold is formed using slab materials having the same thickness but different widths. A flange formed by using K3-1 and the fourth hole mold K4-1 has a short half width, and a flange formed by using the third hole mold K3-2 and the fourth hole mold K4-2. Two types of rough shaped materials, one with a long half width of the portion 100, are formed, and they are formed into a so-called dogbone shape by a known flat forming hole mold (web thickness reducing hole mold), and the dimension of the flange portion is Different H-shaped rough members 13 are formed.

  That is, according to the modeling method according to the present embodiment, the H-shaped rough profile 13 having two different flange widths is modeled from the slab material having the same thickness and different widths at the same roll chance. The two types of H-shaped rough shapes 13 are subjected to a plurality of passes of rolling by using a rolling mill row consisting of two rolling mills of the intermediate universal rolling mill 5-edger rolling mill 9 shown in FIG. The intermediate material 14 is modeled. Then, the intermediate material 14 is finish-rolled into a product shape in the finish universal rolling mill 8 to produce an H-section steel product 16. Here, in the intermediate rolling process and the finishing rolling process, since rolling and shaping that greatly changes the flange piece width are not performed, the H-shaped rough profile 13 having two different flange widths has two different types. An H-shaped steel product with a flange width is produced.

  Moreover, in the modeling method according to the present embodiment, in the second hole mold K2-1 to the fourth hole mold K4-2, the upper and lower end portions (slab end surfaces) of the material A to be rolled are opposed to each other in the final pass. Modeling is performed such that the hole top surface and the hole bottom surface are in contact with each other. That is, the material A to be rolled is shaped in each hole rolling process while maintaining the dimensions with high accuracy in a shape along the hole shape. Therefore, the rough shape material corresponding to the 1st H section steel product (narrow width product) modeled using the 3rd hole type K3-1 and the 4th hole type K4-1, and the 3rd hole type K3-2. And the rough shape material corresponding to the 2nd H section steel product (wide-width product) modeled using the 4th hole type K4-2 is modeled in the shape along each hole type shape. By shaping in this way, the rough shape material corresponding to the first H-section steel product (narrow product) and the rough shape material corresponding to the second H-shape steel product (wide width product) are converted into the left and right flanges. Efficient and stable modeling can be performed while suppressing a shape defect such that the thickness of the corresponding portion (rear flange portion 100) becomes uneven.

  As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

In the above embodiment, the first H-section steel product (narrow product) with a flange piece width L1 and the second H-section steel product (wide product) with a flange piece width L2 (> L1). However, the H-shaped steel product having two types of flange widths manufactured in this way has the following dimensions. Illustrated. That is, for example, when a product with a flange width of 300 mm and 400 mm is manufactured from a slab material having the same thickness, a case with a product with a flange width of 400 mm and 500 mm is considered.
It is known that the dimension pitch of the flange width of a general H-section steel product is 50 mm, and when making two types of H-section steel products with different flange widths by 50 mm, a pass schedule with the same hole type It is also possible to make adjustments. However, when two types of H-shaped steel products with different flange widths of more than 50 mm (for example, 100 mm) are produced separately, the intermediate rolling process or the like hinders deformation of the material to be rolled, and the flange width from the rough shape forming stage Adjustment is required. Therefore, in such a case, by using the method according to the above-described embodiment, two types of H-shaped steel products having different flange widths are manufactured by the same roll chance.

  For example, in the above-described embodiment, the first hole mold K1 to the fourth hole mold K4-2 may be engraved over both the sizing mill 3 and the rough rolling mill 4, and may be engraved in one of the rolling mills. As described with reference to Table 1, the first hole mold K1 to the third hole mold K3-2 are engraved in a sizing mill 3 as a first rolling mill, It is more desirable to engrave the fourth hole molds K4-1 and K4-2 in the rough rolling mill 4 as the second rolling mill.

  Moreover, in the rolling equipment which has only one rolling mill which performs a rough rolling process, it shape | molds using the roll which engraved the 1st hole type K1-the 3rd hole type K3-2 in the 1st heat, You may roll-reform and shape | mold using the roll which engraved the 4th hole type | mold K4-1 and K4-2 in the 2nd heat.

  Moreover, although the slab was illustrated and demonstrated as a raw material at the time of manufacturing H-section steel, this invention is naturally applicable also to the other raw material of a similar shape. That is, for example, the present invention can also be applied to the case where an H-shaped steel is manufactured by shaping a beam blank material.

  The present invention can be applied to a manufacturing technique for manufacturing H-section steel using, for example, a slab having a rectangular cross section as a raw material.

DESCRIPTION OF SYMBOLS 1 ... Rolling equipment 2 ... Heating furnace 3 ... Sizing mill 4 ... Rough rolling mill 5 ... Intermediate universal rolling mill 8 ... Finishing universal rolling mill 9 ... Edger rolling mill 11 ... Slab 12 ... Flange corresponding part 13 ... H-shaped rough shape material 14 ... Intermediate material 16 ... H-shaped steel product 20 ... Upper hole type roll (first hole type K1)
21 ... Pre-hole type roll (first hole type K1)
25, 26 ... projection (first hole type K1)
28, 29 ... Interrupt (first hole type K1)
30 ... Upper hole type roll (second hole type K2-1)
31 ... Pilot hole roll (second hole type K2-1)
35, 36... Projection (second hole type K2-1)
38, 39 ... Interrupt (second hole type K2-1)
40 ... Upper hole type roll (second hole type K2-2)
41 ... Pilot hole type roll (second hole type K2-2)
45, 46... Projection (second hole type K2-2)
48, 49 ... interrupt (second hole type K2-2)
50 ... Upper hole type roll (third hole type K3-1)
51. Pre-hole type roll (third hole type K3-1)
55, 56 ... Projection (third hole type K3-1)
58, 59 ... interrupt (third hole type K3-1)
60 ... Upper hole type roll (third hole type K3-2)
61 ... Pilot hole type roll (third hole type K3-2)
65, 66 ... projection (third hole type K3-2)
68, 69 ... interrupt (third hole type K3-2)
70 ... Upper hole type roll (fourth hole type K4-1)
71 ... lower hole type roll (fourth hole type K4-1)
75, 76 ... projection (fourth hole type K4-1)
78, 79 ... interrupt (fourth hole type K4-1)
80 ... Upper hole type roll (fourth hole type K4-2)
81 ... Pilot hole type roll (fourth hole type K4-2)
85, 86 ... Projection (fourth hole type K4-2)
88, 89 ... interrupt (fourth hole type K4-2)
100 ... Flange A ... Rolled material T ... Production line

Claims (12)

A method for producing an H-section steel comprising a rough rolling step, an intermediate rolling step, and a finish rolling step
In the rolling mill that performs the rough rolling step, a plurality of seven or more hole molds for forming the material to be rolled are engraved,
In the plurality of hole molds, one or multiple pass modeling using a part of the plurality of hole molds is performed,
The plurality of hole molds include a plurality of insertion hole molds provided with projections that interrupt vertically to the width direction of the material to be rolled, and a flange-corresponding portion of the material to be rolled formed by the hole insertion mold. Consists of a plurality of folding hole molds,
The interruption hole type is a three-hole type for inserting three types of interrupts having different lengths.
The folding hole mold has two-stage folding hole molds having different folding angles, and each of the two-stage folding hole molds has two types of different lengths formed in the rolled material in the insertion hole mold. It consists of two types of holes with dimensions corresponding to the flange equivalent parts,
In the bending hole mold, the rolling is performed in a state where the end face of the material to be rolled and the hole mold peripheral surface are in contact with each other in modeling of at least one pass. The plurality of bending hole molds are respectively provided with protrusions that bend the flange equivalent parts by pressing against the flange equivalent parts formed by the insertion hole molds. Manufacturing method of H-section steel. The method for producing an H-section steel according to claim 1 or 2, wherein the tip angles of the protrusions provided in the plurality of insertion hole molds are 25 ° or more and 40 ° or less. In the plurality of bending hole molds, each of the hole molds having dimensions corresponding to two types of flange-corresponding portions having different lengths is provided in two stages with a configuration in which two types of protrusions having different tip angles are provided. ,
Among the bent hole molds provided in the two stages, the tip angle of the projection of one hole mold is 70 ° or more and 110 ° or less,
The method of manufacturing an H-section steel according to any one of claims 1 to 3, wherein the tip angle of the other protrusion is not less than 130 ° and not more than 170 °. The rough rolling step is performed in a sizing mill and a roughing mill,
Of the plurality of the insertion hole molds and the plurality of the bending hole molds, a front hole mold is engraved on a roll of the sizing mill,
The method for producing an H-section steel according to claim 4, wherein a latter-stage hole mold among the plurality of bending hole molds is engraved on a roll of the rough rolling mill. The rough rolling step is performed in one rough rolling mill,
Modeling by the former hole mold among the plurality of the insertion hole molds and the plurality of bending hole molds is performed in the first heat of the rough rolling mill,
5. The method for manufacturing an H-section steel according to claim 4, wherein the shaping by the latter stage hole mold among the plurality of bending hole molds is performed in the second heat of the rough rolling mill. Using materials with the same thickness and different widths,
The manufacturing method of the H-section steel as described in any one of Claims 1-6 which manufactures the H-section steel from which web height is the same, and flange width differs. A rolling apparatus for performing a rough rolling process in the manufacture of H-section steel,
7 or more perforations that perform one or multiple pass modeling of the material to be rolled are engraved,
The plurality of hole molds include a plurality of insertion hole molds provided with projections that interrupt vertically to the width direction of the material to be rolled, and a flange-corresponding portion of the material to be rolled formed by the hole insertion mold. Consists of a plurality of folding hole molds,
The interruption hole type is a three-hole type for inserting three types of interrupts having different lengths.
The folding hole mold has two-stage folding hole molds having different folding angles, and each of the two-stage folding hole molds has two types of different lengths formed in the rolled material in the insertion hole mold. It consists of two types of holes with dimensions corresponding to the flange equivalent parts,
The said bending hole type | mold has a structure which the end surface of a to-be-rolled material and a hole type | mold surrounding surface contact in modeling of at least 1 path | pass or more, The rolling apparatus characterized by the above-mentioned. The plurality of bending hole molds are respectively provided with protrusions that bend the flange equivalent parts by pressing against the flange equivalent parts formed by the insertion hole molds. Rolling equipment. 10. The rolling apparatus according to claim 8, wherein the tip angles of the protrusions provided in the plurality of insertion hole molds are 25 ° or more and 40 ° or less. In the plurality of bending hole molds, each of the hole molds having dimensions corresponding to two types of flange-corresponding portions having different lengths is provided in two stages with a configuration in which two types of protrusions having different tip angles are provided. ,
Among the bent hole molds provided in the two stages, the tip angle of the projection of one hole mold is 70 ° or more and 110 ° or less,
The rolling device according to any one of claims 8 to 10, wherein a tip angle of the other protrusion is not less than 130 ° and not more than 170 °. Consists of a sizing mill and a roughing mill,
Of the plurality of the insertion hole molds and the plurality of the bending hole molds, a front hole mold is engraved on a roll of the sizing mill,
The rolling apparatus according to claim 11, wherein a latter-stage hole mold among the plurality of bending hole molds is engraved on a roll of the rough rolling mill.

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