WO2017119196A1 - H形鋼の製造方法及び圧延装置 - Google Patents
H形鋼の製造方法及び圧延装置 Download PDFInfo
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- WO2017119196A1 WO2017119196A1 PCT/JP2016/084141 JP2016084141W WO2017119196A1 WO 2017119196 A1 WO2017119196 A1 WO 2017119196A1 JP 2016084141 W JP2016084141 W JP 2016084141W WO 2017119196 A1 WO2017119196 A1 WO 2017119196A1
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- hole
- mold
- rolled
- molds
- flange
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/18—Rolls or rollers
Definitions
- the present invention relates to a manufacturing method and a rolling apparatus for manufacturing H-section steel using, for example, a slab having a rectangular cross section as a raw material.
- 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.
- an H-section steel product is modeled by a finishing universal rolling mill.
- Patent Document 2 discloses a technique in which an interruption is applied to the end face of the slab, the interruptions are deepened in order, and then expanded in a box hole mold to form a flange-corresponding portion of H-shaped steel.
- JP-A-7-88501 Japanese Unexamined Patent Publication No. 60-21101
- 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.
- 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.
- 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.
- a material such as a slab in a rough rolling process using a hole mold when manufacturing an H-section steel.
- 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.
- a method for producing an H-section steel comprising a rough rolling process, an intermediate rolling process, and a finish rolling process
- a rolling mill that performs the rough rolling process includes: Seven or more hole molds for shaping the rolled material are engraved, and the plurality of hole molds form one or more passes of the material to be rolled, and the plurality of hole molds are arranged in the width direction of the material to be rolled.
- a plurality of slot holes as a front hole type provided with protrusions for vertically interrupting, and a plurality of holes as a rear hole type that bend the flange corresponding part of the material to be rolled formed by the hole type.
- mold has a hole type
- Dimensions corresponding to two different flange equivalent parts In the bent hole mold the reduction is performed in a state where the end surface of the material to be rolled and the peripheral surface of the hole mold are in contact with each other in modeling of at least one pass.
- a manufacturing method is provided.
- the plurality of bending hole molds may be provided with protrusions that bend the flange corresponding parts by pressing against the flange corresponding parts 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.
- 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.
- the tip angle of the projection of one hole mold is 70 ° or more and 110 ° or less
- 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.
- 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.
- 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.
- the present invention 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 are a plurality of insertion hole molds as a former hole mold provided with projections for interrupting perpendicularly to the width direction of the material to be rolled, and a rolled material formed by the insertion hole molds It is composed of a plurality of folding hole molds as a post-stage hole mold that bends the portion corresponding to the flange of the material, and the interrupting hole mold has a hole mold for inserting two types of interrupts having different lengths, and the bending hole mold is There is a hole mold having a dimension corresponding to two types of flange-corresponding portions having different lengths formed in the rolled material in the interrupted hole mold, and the bending hole mold is a material to be rolled in modeling of at least one pass or more.
- the plurality of bending hole molds may be provided with protrusions that bend the flange corresponding parts by pressing against the flange corresponding parts 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.
- 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.
- the tip angle of the projection of one hole mold is 70 ° or more and 110 ° or less
- 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.
- 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.
- 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.
- H-shaped steels having different flange widths can be separately produced with the same roll.
- FIG. 1 is an explanatory diagram of an H-section steel production line T including a rolling facility 1 according to the present embodiment.
- 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.
- an edger rolling mill 9 is provided in the vicinity of the intermediate universal rolling mill 5.
- 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.
- 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.
- intermediate rolling is performed in the intermediate universal rolling mill 5.
- the edger rolling machine 9 applies a reduction to the end of the material to be rolled (flange corresponding portion 12) as necessary.
- the rolls of the sizing mill 3 and the roughing mill 4 are engraved with about 4 to 6 holes, and the H-shaped rough profile is formed by reverse rolling in multiple passes via these.
- the H-shaped rough shaped material 13 is formed, and the H-shaped rough shaped 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.
- a material A to be rolled formed with these hole molds is a so-called dogbone-shaped H-shaped rough section.
- 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.
- FIGS. 2 to 8 are schematic explanatory views of the sizing mill 3 for performing the rough rolling process and the hole mold engraved in the rough rolling mill 4.
- the first to fourth hole molds to be described may be all engraved in the sizing mill 3, for example, and the first to fourth hole molds are divided into the sizing mill 3 and the roughing 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.
- modeling is performed in one or a plurality of passes in each of these perforations.
- 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 is the 2-1 hole type and the second hole type.
- the -2 hole type, 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 shown by a broken line.
- FIG. 2 is a schematic explanatory diagram 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.
- 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 ⁇ 1a.
- 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.
- the tip end angle (also referred to as wedge angle) ⁇ 1a 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.
- the range of the wedge angle ⁇ 1a is preferably 25 ° or more and 40 ° or less in the hole configuration according to the present embodiment.
- the hole width of the first hole mold K1 is 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.
- 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).
- 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 ⁇ T) is sufficiently larger than the reduction amount (slab end surface reduction amount ⁇ E) 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 type K2-1.
- the second hole mold K2-1 is engraved in an upper hole roll 30 and a lower hole 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.
- On the peripheral surface of the lower hole type roll 31 that is, the bottom surface of the second hole type K2-1
- a projecting portion 36 protruding toward the inside of the hole type is formed.
- 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 ⁇ 1b of 25 ° or more and 40 ° or less.
- 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.
- the height h2 of the protrusions 35 and 36 formed on the second hole mold K2-1 is higher than the height h1 of the protrusions 25 and 26 formed on the first hole mold K1, and the workpiece is rolled.
- the length of penetration into the upper and lower ends (slab end surfaces) of the material A is longer in the second hole type K2-1.
- the penetration depth of the projections 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 projections 35 and 36. That is, the penetration depth h1 ′ of the protrusions 25 and 26 into the rolled material A in the first hole mold K1, and the penetration of the protrusions 35 and 36 into the rolled material A in the second hole mold K2-1.
- the depth h2 has a relationship of h1 ′ ⁇ h2. Further, an angle ⁇ f 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 protrusions 35 and 36 is shown in FIG. The four locations shown are each configured at about 90 ° (substantially at right angles).
- the first hole in the second hole type K2-1 Modeling is performed so that the interrupts 28 and 29 formed in the mold K1 become deeper, and interrupts 38 and 39 are formed.
- the second hole mold K2-1 is formed by multiple passes. In the multipass formation, 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.
- FIG. 4 is a schematic explanatory diagram of the second hole type K2-2.
- the second hole mold K2-2 is engraved in a pair of horizontal rolls, an upper hole roll 40 and a lower hole roll 41.
- a protrusion 45 is formed that protrudes toward the inside of the hole type.
- a protruding portion 46 that protrudes toward the inside of the hole type is formed.
- the shapes of the protrusions 45 and 46 are similar to the shapes of the protrusions 35 and 36 of the second hole type K2-1, and the tip angle is a wedge angle of 25 ° to 40 °. ⁇ 1b.
- 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 ′).
- an angle ⁇ f 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).
- 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.
- the second hole mold K2-2 is formed by multiple passes. In the multipass formation, 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.
- the second hole molds K2-1 and K2-2 can be properly used as necessary.
- 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 modeling is performed by passing the material through, and the modeling is performed by passing the material through both the second hole mold K2-1 and the second hole mold K2-2.
- FIG. 3 shows a case where an H-shaped rough material having a short flange piece width at the flange corresponding portion (a portion corresponding to the 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.
- 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.
- 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.
- two types of flanges can be obtained from a material having the same slab thickness and a different width as an H-shaped steel as the final product. Modeling for manufacturing products with different widths can be performed.
- 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 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.
- 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).
- the first hole mold K1 and the second hole molds K2-1 and K2-2 described above are intended to form interrupts at the upper and lower ends (slab end surfaces) 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.
- a protruding portion 55 that protrudes toward the inside of the hole type is formed.
- a protrusion 56 protruding toward the inside of the hole type is formed.
- the tip angle ⁇ 2 of the protrusions 55 and 56 is configured to be wider than the angle ⁇ 1b, and the penetration depth h3 of the protrusions 55 and 56 into the material A to be rolled 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).
- an angle ⁇ f 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).
- the second hole is formed at the upper and lower end portions (slab end surfaces) of the material to be rolled A with respect to the material A to be rolled after passing through the second hole mold 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 interrupt angle) is ⁇ 2.
- interrupt angle the deepest part angle of the interrupts 58 and 59
- the shaping with the third hole mold K3-1 is performed by at least one pass, and in the shaping, the upper and lower ends (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 50a and 50b and the hole bottom surfaces 51a and 51b come into contact with each other. This is because if 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 to be 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 type K3-2 is engraved in an upper hole type roll 60 and a lower hole type 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.
- On the peripheral surface of the lower hole type roll 61 that is, the bottom surface of the third hole type K3-2
- a protruding portion 66 protruding toward the inside of the hole type is formed.
- 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.
- the shape of the protrusions 65 and 66 is similar to the shape of the protrusions 55 and 56 of the third hole type K3-1, the tip end angle is also the wedge angle ⁇ 2, and the protrusion 65 , 66 is configured to be higher than the height h3 of the protrusions 55 and 56 (that is, h3 ⁇ h3 ′). Further, an angle ⁇ f 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).
- the second hole is formed at the upper and lower ends (slab end surfaces) of the material A to be rolled with respect to the material A after passing through the second hole mold K2-2.
- the interrupts 48 and 49 formed in the mold K2-2 become interrupts 68 and 69 when the protrusions 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 ⁇ 2.
- the interrupt angle is ⁇ 2.
- modeling is performed such that a divided part (part corresponding to a flange part 100 described later) formed with the interruptions 48 and 49 is bent outward.
- the shaping with the third hole mold K3-2 is performed by at least one pass, and in the shaping, the upper and lower end portions (slab end faces) 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 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 to be 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 divided parts (parts corresponding to the flange portion 100 described later) formed by interruption are on the outside.
- the third hole mold K3-1 is used to form the material A to be rolled using only the second hole mold K2-1 as the previous hole mold.
- the third hole mold K3-2 is used to form the material A to be rolled 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.
- 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 ⁇ 2 of the third hole types K3-1 and K3-2 is desirably set to, for example, 70 ° to 110 °.
- the interrupt angle ⁇ 2 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.
- 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 ⁇ 2 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 an upper hole type roll 70 and a lower hole type roll 71 which are a pair of horizontal rolls.
- a protruding portion 75 protruding toward the inside of the hole type is formed.
- a protrusion 76 protruding toward the inside of the hole type is formed.
- 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 ⁇ 3 of the projections 75 and 76 is configured to be wider than the angle ⁇ 2, 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).
- an angle ⁇ f 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).
- the interruptions 58 and 59 formed in the mold K3-1 become interruptions 78 and 79 when the protrusions 75 and 76 are pressed against each other. That is, in the final pass in modeling with the fourth hole mold K 4-1, the deepest part angle of the interrupts 78 and 79 (hereinafter also referred to as the interrupt angle) is ⁇ 3.
- the interrupt angle is ⁇ 3.
- modeling is performed such that a divided part (part corresponding to a flange part 100 described later) formed with the interruptions 58 and 59 is bent outward.
- the shaping with the fourth hole mold K4-1 is performed by at least one pass, and in the shaping, the upper and lower end portions (slab end faces) 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 to be 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 type K4-2 is engraved in the upper hole type roll 80 and the lower hole type roll 81 which are a pair of horizontal rolls.
- a protrusion 85 protruding toward the inside of the hole type is formed.
- a protruding portion 86 protruding toward the inside of the hole type is formed.
- 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.
- 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 ⁇ 3, and the protrusion 85 , 86 is configured to be higher than the height h4 of the protrusions 75 and 76 (that is, h4 ⁇ h4 ′).
- the angle ⁇ f 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).
- the third hole at the upper and lower ends (slab end surfaces) of the material A to be rolled relative to the material A after the third hole mold K3-2 is passed.
- 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 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 ⁇ 3.
- the third hole mold K3-2 modeling is performed such that the divided parts (parts corresponding to the flange portion 100 described later) that are modeled together with the formation of the interrupts 68 and 69 are 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.
- the shaping with the fourth hole mold K4-2 is performed by at least one pass, and in the shaping, the upper and lower end portions (slab end faces) 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, there is a defective shape such that the flange 100 is shaped asymmetrically. This is because there is a fear and there is a problem in terms of material permeability.
- the interrupt angle ⁇ 3 of the fourth hole molds K4-1 and K4-2 is preferably set to an angle slightly smaller than 180 °, for example, preferably set to 130 ° or more and 170 ° or less. This is because if the interrupt angle ⁇ 3 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 ⁇ 3 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 type K4-1 and the fourth hole type K4-2 described with reference to FIG. 7 and FIG. 8 are holes for bending the divided part (the rear flange part 100) formed by interruption to the outside.
- the fourth hole mold K4-1 is a mold
- the fourth hole mold K4-1 molds the material A to be rolled using the third hole mold K3-1 as the previous hole mold.
- the fourth hole mold K4-2 is used for modeling the material A to be rolled which is modeled using the third hole mold K3-2 as the previous hole mold. That is, when manufacturing two types of products having 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.
- the flange portion 100 formed with the fourth hole mold K4-2 is more than the flange portion 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 on 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.
- the flange portion 100 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.
- interrupts 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).
- 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.
- 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). Then, the material to be rolled A is further shaped in the fourth hole mold K4-1 after being shaped in the third hole mold K3-1, and is divided with the formation of the interrupts 78 and 79 (the flange portion 100 described later). Are further bent outward (see FIG. 7).
- 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.
- the material A to be rolled is the second hole mold K2-.
- modeling is performed to deepen the formed interrupts 38 and 39 to form interrupts 48 and 49 (see FIG. 4).
- the material A to be rolled is shaped by the second hole mold K2-2, and further shaped by the third hole mold K3-2.
- the interrupts 48 and 49 are expanded, and are formed together 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).
- the material to be rolled A 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).
- 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.
- the two types of H-shaped rough shapes formed in this way have different flange piece widths of L1 and L2.
- the width of the H-shaped rough shape the width of the portion corresponding to the web is substantially equal.
- 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
- 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.
- the first H-section steel product (narrow product) and the second H-section steel product (wide product) are produced separately by the modeling process as shown in Table 1.
- the second hole Type 2-1 G2-1 in the table
- 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.
- 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, a stable flange equivalent portion can be formed and an interrupt can be formed.
- 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.
- the third hole mold is formed by using slab materials having the same thickness but different widths.
- the flange 100 formed using K3-1 and the fourth hole mold K4-1 has a short half width, and the flange formed 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.
- 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 an intermediate universal rolling mill 5-edger rolling mill 9 shown in FIG.
- the intermediate material 14 is modeled.
- 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.
- 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.
- 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, a rough shape material corresponding to the first H-shaped steel product (narrow width product) formed using the third hole mold K3-1 and the fourth hole mold K4-1, and the third hole mold K3-2.
- the rough shape material corresponding to the 2nd H section steel product (wide product) modeled using the 4th hole type K4-2 is modeled in the shape along each hole type shape.
- 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.
- 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.
- 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.
- 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.
- the first hole type K1 to the fourth hole type K4-2 may be engraved over both the sizing mill 3 and the rough rolling mill 4, or may be engraved in one of the rolling mills.
- 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.
- modeling is performed using a roll in which the first hole mold K1 to the third hole mold K3-2 are engraved in the first heat.
- the rolls may be rearranged and modeling may be performed using a roll in which the fourth hole molds K4-1 and K4-2 are engraved in the second heat.
- the slab has been described as an example of the material for manufacturing the H-shaped steel, the present invention is naturally applicable to other materials having similar shapes. 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.
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Abstract
Description
本願は、2016年1月7日に日本国に出願された特願2016-002066号に基づき、優先権を主張し、その内容をここに援用する。
ウェッジ角度の下限値は通常ロールの強度により決まる。被圧延材Aがロール(第1孔型K1では上孔型ロール20及び下孔型ロール21)と接触し、その間に受ける熱によりロールが膨張し、被圧延材Aがロールから離れるとロールが冷却され収縮する。造形中はこれらのサイクルが繰り返されるが、ウェッジ角度が小さすぎると、突起部(第1孔型K1では突起部25、26)の厚みが薄いために被圧延材Aからの入熱が当該突起部の左右から入りやすくなり、ロールがより高温になり易い。ロールが高温になると熱振れ幅が大きくなるためにヒートクラックが入り、ロール破損に至る恐れがある。
一方、ウェッジ角度が大きくなると、各孔型における割り込み(第1孔型K1では割り込み28、29)形成時に幅拡がりによる変形が生じ、特に、以下に説明する第2孔型K2以降での造形においてフランジの生成効率が低下する。
以上のような観点から、本発明者らが鋭意解析評価を行った結果、本実施の形態にかかる孔型構成においては、ウェッジ角度θ1aの範囲は25°以上40°以下であることが望ましい。
また、被圧延材Aの上下端部(スラブ端面)に対向する孔型上面30a、30b及び孔型底面31a、31bと、突起部35、36の傾斜面とのなす角度θfは、図3に示す4箇所ともに約90°(略直角)に構成されている。
また、この第2孔型K2-1での造形は多パスにより行われるが、当該多パス造形においては、最終パスにて被圧延材Aの上下端部(スラブ端面)と、それに対向する孔型上面30a、30b及び孔型底面31a、31bとが接触するような造形が行われる。これは、第2孔型K2-1での全てのパスにおいて被圧延材Aの上下端部と孔型内部とを非接触とすると、フランジ相当部(後述するフランジ部100)が左右非対称に造形されるといった形状不良が生じる恐れがあり、通材性の面で問題があるからである。
また、被圧延材Aの上下端部(スラブ端面)に対向する孔型上面40a、40b及び孔型底面41a、41bと、突起部45、46の傾斜面とのなす角度θfは、図4に示す4箇所ともに約90°(略直角)に構成されている。
また、この第2孔型K2-2での造形は多パスにより行われるが、当該多パス造形においては、最終パスにて被圧延材Aの上下端部(スラブ端面)と、それに対向する孔型上面40a、40b及び孔型底面41a、41bとが接触するような造形が行われる。これは、第2孔型K2-2での全てのパスにおいて被圧延材Aの上下端部と孔型内部とを非接触とすると、フランジ相当部(後述するフランジ部100)が左右非対称に造形されるといった形状不良が生じる恐れがあり、通材性の面で問題があるからである。
なお、以上説明した第1孔型K1ならびに第2孔型K2-1、K2-2は、被圧延材Aの上下端部(スラブ端面)に割り込みを形成させるものであることから、割り入れ孔型とも呼称される。
また、被圧延材Aの上下端部(スラブ端面)に対向する孔型上面50a、50b及び孔型底面51a、51bと、突起部55、56の傾斜面とのなす角度θfは、図5に示す4箇所ともに約90°(略直角)に構成されている。
即ち、同一のロールチャンスでもって2種類のフランジ幅が異なる製品を製造する場合において、第3孔型K3-1はフランジ幅の短い製品を製造する際に用いられ、第3孔型K3-2はフランジ幅の長い製品を製造する際に用いられる。当然、図5と図6を比較して分かるように、第3孔型K3-1で造形されたフランジ相当部(後述するフランジ部100)よりも、第3孔型K3-2で造形されたフランジ相当部(後述するフランジ部100)の方が、フランジ片幅が長くなるように造形される。
以上のような観点から、本発明者らが鋭意解析評価を行った結果、本実施の形態にかかる孔型構成においては、割り込み角度θ2の範囲は70°以上110°以上であることが望ましい。
また、被圧延材Aの上下端部(スラブ端面)に対向する孔型上面70a、70b及び孔型底面71a、71bと、突起部75、76の傾斜面とのなす角度θfは、図7に示す4箇所ともに約90°(略直角)に構成されている。
即ち、同一のロールチャンスでもって2種類のフランジ幅が異なる製品を製造する場合において、第4孔型K4-1はフランジ幅の短い製品を製造する際に用いられ、第4孔型K4-2はフランジ幅の長い製品を製造する際に用いられる。当然、図7と図8を比較して分かるように、第4孔型K4-1で造形されたフランジ部100よりも、第4孔型K4-2で造形されたフランジ部100の方が、フランジ片幅が長くなるように造形される。
なお、以上説明した第3孔型K3-1、K3-2ならびに第4孔型K4-1、K4-2は、被圧延材Aの上下端部(スラブ端面)に形成された分割部位(後のフランジ部100)を外側に折り曲げる造形を行うことから、折り曲げ孔型とも呼称される。
ここで、第1のH形鋼製品のフランジ片幅L1は、第2孔型K2-1での割り込み38、39の形成と共に造形されるフランジ相当部の片幅に依存する。
ここで、第2のH形鋼製品のフランジ片幅L2は、第2孔型K2-2での割り込み48、49の形成と共に造形されるフランジ相当部の片幅に依存する。
また、第1のH形鋼製品(狭幅製品)に関する1~4の番号ならびに第2のH形鋼製品(広幅製品)に関する1~5の番号は、通材させる孔型とその順序を示している。
一般的なH形鋼製品のフランジ幅の寸法ピッチは50mmであることが知られており、フランジ幅が50mm異なる2種類のH形鋼製品を造り分ける場合には、同一孔型でのパススケジュールの調整等でも行うことが可能である。しかしながら、フランジ幅が50mm超(例えば100mm)異なる2種類のH形鋼製品を造り分ける場合には、中間圧延工程等で被圧延材の変形に支障をきたし、粗形材の造形段階からフランジ幅の調整が必要となる。従って、そのような場合には、上記実施の形態に係る方法を用いることで同一のロールチャンスでの造り分けにより2種類の異なるフランジ幅のH形鋼製品が製造される。
2…加熱炉
3…サイジングミル
4…粗圧延機
5…中間ユニバーサル圧延機
8…仕上ユニバーサル圧延機
9…エッジャー圧延機
11…スラブ
12…フランジ対応部
13…H形粗形材
14…中間材
16…H形鋼製品
20…上孔型ロール(第1孔型K1)
21…下孔型ロール(第1孔型K1)
25、26…突起部(第1孔型K1)
28、29…割り込み(第1孔型K1)
30…上孔型ロール(第2孔型K2-1)
31…下孔型ロール(第2孔型K2-1)
35、36…突起部(第2孔型K2-1)
38、39…割り込み(第2孔型K2-1)
40…上孔型ロール(第2孔型K2-2)
41…下孔型ロール(第2孔型K2-2)
45、46…突起部(第2孔型K2-2)
48、49…割り込み(第2孔型K2-2)
50…上孔型ロール(第3孔型K3-1)
51…下孔型ロール(第3孔型K3-1)
55、56…突起部(第3孔型K3-1)
58、59…割り込み(第3孔型K3-1)
60…上孔型ロール(第3孔型K3-2)
61…下孔型ロール(第3孔型K3-2)
65、66…突起部(第3孔型K3-2)
68、69…割り込み(第3孔型K3-2)
70…上孔型ロール(第4孔型K4-1)
71…下孔型ロール(第4孔型K4-1)
75、76…突起部(第4孔型K4-1)
78、79…割り込み(第4孔型K4-1)
80…上孔型ロール(第4孔型K4-2)
81…下孔型ロール(第4孔型K4-2)
85、86…突起部(第4孔型K4-2)
88、89…割り込み(第4孔型K4-2)
100…フランジ部
A…被圧延材
T…製造ライン
Claims (12)
- 粗圧延工程、中間圧延工程、仕上圧延工程を備えたH形鋼の製造方法であって、
前記粗圧延工程を行う圧延機には、被圧延材を造形する7以上の複数の孔型が刻設され、
前記複数の孔型では被圧延材の1又は複数パス造形が行われ、
前記複数の孔型は、被圧延材の幅方向に対し鉛直に割り込みを入れる突起部が設けられた前段孔型としての複数の割り入れ孔型と、当該割り入れ孔型によって形成された被圧延材のフランジ相当部を折り曲げる後段孔型としての複数の折り曲げ孔型から構成され、
前記割り入れ孔型は、長さの異なる2種類の割り込みを入れる孔型を有し、
前記折り曲げ孔型は、前記割り入れ孔型において被圧延材に形成された長さの異なる2種類のフランジ相当部に対応した寸法の孔型を有し、
前記折り曲げ孔型では、少なくとも1パス以上の造形において被圧延材の端面と孔型周面とが接触した状態で圧下が行われることを特徴とする、H形鋼の製造方法。 - 複数の前記折り曲げ孔型には、前記割り入れ孔型によって形成されたフランジ相当部に押し当てることで当該フランジ相当部を折り曲げる突起部がそれぞれ設けられることを特徴とする、請求項1に記載のH形鋼の製造方法。
- 複数の前記割り入れ孔型に設けられた突起部の先端角度はいずれも25°以上40°以下であることを特徴とする、請求項1又は2に記載のH形鋼の製造方法。
- 複数の前記折り曲げ孔型においては、長さの異なる2種類のフランジ相当部に対応した寸法の孔型のそれぞれについて、先端角度の異なる2種類の突起部が設けられた構成で2段に設けられ、
当該2段に設けられた折り曲げ孔型のうち、一方の孔型の突起部の先端角度は70°以上110°以下であり、
他方の突起部の先端角度は130°以上170°以下であることを特徴とする、請求項1~3のいずれか一項に記載のH形鋼の製造方法。 - 前記粗圧延工程は、サイジングミル及び粗圧延機において行われ、
複数の前記割り入れ孔型及び複数の前記折り曲げ孔型のうちの前段孔型は前記サイジングミルのロールに刻設され、
複数の前記折り曲げ孔型のうちの後段孔型は前記粗圧延機のロールに刻設されることを特徴とする、請求項4に記載のH形鋼の製造方法。 - 前記粗圧延工程は、1基の粗圧延機において行われ、
複数の前記割り入れ孔型及び複数の前記折り曲げ孔型のうちの前段孔型による造形は、当該粗圧延機の1ヒート目にて行われ、
複数の前記折り曲げ孔型のうちの後段孔型による造形は、当該粗圧延機の2ヒート目にて行われることを特徴とする、請求項4に記載のH形鋼の製造方法。 - 厚みが同一且つ幅の異なる素材を用い、
ウェブ高さが同一であり、且つフランジ幅が異なるH形鋼を製造する、請求項1~6のいずれか一項に記載のH形鋼の製造方法。 - H形鋼の製造における粗圧延工程を行う圧延装置であって、
被圧延材の1又は複数パス造形を行う7以上複数の孔型が刻設され、
前記複数の孔型は、被圧延材の幅方向に対し鉛直に割り込みを入れる突起部が設けられた前段孔型としての複数の割り入れ孔型と、当該割り入れ孔型によって形成された被圧延材のフランジ相当部を折り曲げる後段孔型としての複数の折り曲げ孔型から構成され、
前記割り入れ孔型は、長さの異なる2種類の割り込みを入れる孔型を有し、
前記折り曲げ孔型は、前記割り入れ孔型において被圧延材に形成された長さの異なる2種類のフランジ相当部に対応した寸法の孔型を有し、
前記折り曲げ孔型は、少なくとも1パス以上の造形において被圧延材の端面と孔型周面とが接触する構成を有することを特徴とする、圧延装置。 - 複数の前記折り曲げ孔型には、前記割り入れ孔型によって形成されたフランジ相当部に押し当てることで当該フランジ相当部を折り曲げる突起部がそれぞれ設けられることを特徴とする、請求項8に記載の圧延装置。
- 複数の前記割り入れ孔型に設けられた突起部の先端角度はいずれも25°以上40°以下であることを特徴とする、請求項8又は9に記載の圧延装置。
- 複数の前記折り曲げ孔型においては、長さの異なる2種類のフランジ相当部に対応した寸法の孔型のそれぞれについて、先端角度の異なる2種類の突起部が設けられた構成で2段に設けられ、
当該2段に設けられた折り曲げ孔型のうち、一方の孔型の突起部の先端角度は70°以上110°以下であり、
他方の突起部の先端角度は130°以上170°以下であることを特徴とする、請求項8~10のいずれか一項に記載の圧延装置。 - サイジングミル及び粗圧延機から構成され、
複数の前記割り入れ孔型及び複数の前記折り曲げ孔型のうちの前段孔型は前記サイジングミルのロールに刻設され、
複数の前記折り曲げ孔型のうちの後段孔型は前記粗圧延機のロールに刻設されることを特徴とする、請求項11に記載の圧延装置。
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CN201680076931.7A CN108430659B (zh) | 2016-01-07 | 2016-11-17 | H型钢的制造方法和轧制装置 |
US16/065,985 US20190009315A1 (en) | 2016-01-07 | 2016-11-17 | Method for producing h-shaped steel and rolling apparatus |
KR1020187020714A KR20180097665A (ko) | 2016-01-07 | 2016-11-17 | H형 강의 제조 방법 및 압연 장치 |
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