WO2019156078A1 - Procédé de production pour des poutrelles en h - Google Patents

Procédé de production pour des poutrelles en h Download PDF

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Publication number
WO2019156078A1
WO2019156078A1 PCT/JP2019/004082 JP2019004082W WO2019156078A1 WO 2019156078 A1 WO2019156078 A1 WO 2019156078A1 JP 2019004082 W JP2019004082 W JP 2019004082W WO 2019156078 A1 WO2019156078 A1 WO 2019156078A1
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WIPO (PCT)
Prior art keywords
rolling
hole
rolled
mold
raised portion
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PCT/JP2019/004082
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English (en)
Japanese (ja)
Inventor
浩 山下
Original Assignee
日本製鉄株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本製鉄株式会社 filed Critical 日本製鉄株式会社
Priority to US16/755,860 priority Critical patent/US20200391261A1/en
Priority to JP2019520918A priority patent/JP6614396B1/ja
Priority to CN201980006415.0A priority patent/CN111479638A/zh
Priority to EP19751407.8A priority patent/EP3698894A1/fr
Publication of WO2019156078A1 publication Critical patent/WO2019156078A1/fr

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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
    • B21B2273/00—Path parameters
    • B21B2273/22—Aligning on rolling axis, e.g. of roll calibers

Definitions

  • the present invention relates to a manufacturing method 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.
  • the web equivalent portion is stretched in the longitudinal direction, and the flange equivalent portion is also stretched in the longitudinal direction by being pulled by the stretching, so that the thickness of the flange equivalent portion is reduced.
  • the phenomenon was a concern.
  • Patent Document 2 discloses a technique for selectively reducing the web equivalent part, and an uncompressed lower part is provided in the center of the web equivalent part, and the convex formed thereafter. By removing the portion (corresponding to the raised portion of the present invention) and widening the web-corresponding portion, large H-section steel is efficiently manufactured.
  • a large coarse material may be rolled and shaped in the rough rolling process.
  • flat shaping rolling is performed by the technique described in Patent Document 2 above. It has been found that problems such as elongation in the web height direction and deformation of the flange-corresponding portion occur.
  • the inventors of the present invention have a process for erasing the uncompressed lower part in the subsequent process in addition to the preceding process having a recess for generating an uncompressed lower part (a raised part to be described later) on the web. Evaluation is conducted by an integrated process including Specifically, as described in the embodiment of the present invention described later, for example, when a 300-thick slab is used as a raw material, the uncompressed lower portion has a width of 25% or more and 50% or less of the in-web method of the material to be rolled. The inventors have found that the flange generation efficiency is increased by setting the width, and have led to the present invention.
  • the present invention provides a large-sized rough shape material without causing problems such as elongation in the web height direction and deformation of the flange-corresponding portion in the rough rolling process using the hole mold when manufacturing the H-section steel.
  • An object of the present invention is to provide a technique for efficiently and stably producing an H-shaped steel product having a larger flange width than conventional ones.
  • a method for producing an H-section steel comprising a rough rolling step, an intermediate rolling step, and a finish rolling step, wherein the rough rolling step is performed by applying a predetermined material to be rolled.
  • the hole molds at least one hole type upper and lower hole rolls are provided with a recess for forming a raised portion at the center of the web part of the material to be rolled at the center of the roll body length of the upper and lower hole rolls.
  • the hole mold for performing the rolling process there is a raised portion erasing hole mold for rolling down the raised portion with respect to the rolled material on which the raised portion is formed and expanding the inner width of the web portion of the rolled material. Further included, rolling modeling with the raised portion elimination hole mold Is performed on the material to be rolled after the bulge portion is formed in the hole mold having the dent portion for forming the bulge portion, and the rolling modeling for forming the bulge portion is performed after the bulge portion is reduced. There is provided a method for producing H-section steel, characterized in that it is not performed.
  • the rolling shaping with the raised portion erasure hole mold is performed in a plurality of passes, and the rolling shaping is performed in a state where the flange inner surface of the material to be rolled and the hole roll are in contact in at least one of the plurality of passes. May be.
  • Rolling shaping with the raised portion erasure hole mold is performed in a plurality of passes, and rolling shaping is performed in a state where the flange inner surface of the material to be rolled and the hole roll are in contact in the first pass among the plurality of passes. Also good.
  • the protruding part may be partially erased, and the remaining raised part may be erased by rolling modeling with any subsequent hole mold.
  • the width of the raised portion formed in the flat rolling step may be set to 25% or more and 50% or less of the web inner portion method of the material to be rolled.
  • the reduction ratio with respect to the raised portion in the raised portion erasing hole mold may be 2.1 or less.
  • the edging process is performed by using a plurality of four or more hole molds, and one or a plurality of passes of the material to be rolled are formed in the plurality of hole molds.
  • the mold is formed with a protrusion that vertically interrupts the width direction of the material to be rolled to form a divided portion at the end of the material to be rolled, and the holes after the third hole type among the plurality of hole types
  • the mold may be formed with a protrusion that abuts against the interruption and sequentially folds the formed divided portions.
  • a large-sized rough shape is formed without causing problems such as elongation in the web height direction and deformation of the flange equivalent portion.
  • Rolling can be performed to efficiently and stably produce an H-shaped steel product having a larger flange width than before.
  • FIG. It is a schematic explanatory drawing about the structure of a desirable 6th hole type. It is the schematic based on the simulation which shows the to-be-rolled material shape after each protruding part elimination
  • FIG. It is a graph which shows the relationship between an escape rate and the flange width increase / decrease rate after H-shaped rough shape shaping.
  • 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 rectangular cross-section material for example, 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 reduces the flange tip portion (flange corresponding portion 12) of the material to be rolled as necessary.
  • the rolls of the sizing mill 3 and the roughing mill 4 are engraved with so-called flat shaping hole molds for reducing the thickness of the edging hole mold and the web part and forming the shape of the flange part.
  • the H-shaped rough profile 13 is formed by reverse rolling of a plurality of passes, and the H-shaped rough profile 13 is formed by using a rolling mill row composed of two rolling mills, the intermediate universal rolling mill 5-edger rolling mill 9. A plurality of passes of reduction are applied, and the intermediate material 14 is formed. 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.
  • the slab thickness T of the slab 11 extracted from the heating furnace 2 is in a range of 290 mm to 310 mm, for example. This is a dimension of a slab material called a so-called 300-thick slab used when manufacturing a large H-shaped steel product.
  • FIG. 1 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.
  • FIG. 1 the first to sixth hole molds to be described may be all engraved in the sizing mill 3, for example, and the sizing mill 3 and the roughing mill 4 have six holes of the first to sixth hole molds.
  • the hole mold may be engraved separately. That is, the first to sixth hole molds may be engraved over both the sizing mill 3 and the roughing mill 4, or may be engraved on either one of the mills.
  • modeling is performed in one or a plurality of passes in each of these perforations.
  • the number of hole types is not necessarily 6 hole types, and the number of hole types is not less than 6. It may be.
  • any hole configuration suitable for modeling the H-shaped rough member 13 may be used. 2 to 7, 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 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 top 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 (flange portion 80 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) is sufficiently larger than the reduction amount (slab end surface reduction amount) 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.
  • mold K2 is engraved by the upper hole type
  • a protruding portion 35 that protrudes toward the inside of the hole type is formed.
  • 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).
  • 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 wedge angle ⁇ 1a of the first hole mold K1 is a wedge angle of the second hole mold K2 in the subsequent stage in order to secure the tip end thickness of the flange-corresponding portion, increase the inductivity, and ensure the stability of rolling.
  • the angle is preferably the same as ⁇ 1b.
  • the height (projection length) h2 of the protrusions 35 and 36 is configured to be higher than the height h1 of the protrusions 25 and 26 of the first hole type K1, and h2> h1.
  • the material A to be rolled after the first hole K1 passing material is further shaped.
  • the height h2 of the protrusions 35 and 36 formed on the second hole mold K2 is higher than the height h1 of the protrusions 25 and 26 formed on the first hole mold K1, and the material A to be rolled A Similarly, the length of penetration into the upper and lower ends (slab end face) of the second hole mold K2 is longer.
  • the penetration depth of the projections 35 and 36 into the material to be rolled A in the second hole mold K2 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 depth of the protrusions 35 and 36 into the rolled material A in the second hole mold K2.
  • 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 intrusion length of the protrusion when pressed against the upper and lower ends (slab end face) of the material A is long, in the second hole type K2, the first hole type K1.
  • Modeling is performed so that the interrupts 28 and 29 formed in step 1 are further deepened, and interrupts 38 and 39 are formed.
  • the flange piece width at the end of the flange shaping process in the rough rolling process is determined based on the dimensions of the interrupts 38 and 39 formed here.
  • the second hole mold K2 shown in FIG. 3 is formed by multiple passes.
  • the material A is actively reduced at the upper and lower ends (slab end surfaces) of the material A. Is not done. This is because the rolling causes elongation of the material A to be rolled in the longitudinal direction and reduces the generation efficiency of a flange-corresponding portion (corresponding to a flange portion 80 described later).
  • FIG. 4 is a schematic explanatory diagram of the third hole type K3.
  • the third hole type K3 is engraved in the upper hole type roll 40 and the lower hole type roll 41 which are a pair of horizontal rolls.
  • a protrusion 45 that protrudes toward the inside of the hole type is formed.
  • a projection 46 is formed on the peripheral surface of the lower hole roll 41 (that is, the bottom surface of the third hole mold K3) protruding toward the inside of the hole mold.
  • the protrusions 45 and 46 have a tapered shape, and the protrusion 45 and the protrusion 46 have the same dimensions such as the protrusion length.
  • the tip end angle ⁇ 2 of the projections 45 and 46 is configured to be wider than the angle ⁇ 1b, and the penetration depth h3 of the projections 45 and 46 into the material to be rolled A is the penetration depth of the projections 35 and 36.
  • the length is shorter than h2 (that is, h3 ⁇ h2).
  • This angle ⁇ 2 is preferably 70 ° or more and 110 ° or less, for example.
  • 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 shaping with the third hole mold K3 shown in FIG. 4 is performed by at least one pass, and the rolling material A is not actively reduced in these passes in the pass shaping. This is because the rolling causes elongation of the material A to be rolled in the longitudinal direction and reduces the generation efficiency of a flange-corresponding portion (corresponding to a flange portion 80 described later).
  • FIG. 5 is a schematic explanatory diagram of the fourth hole type K4.
  • mold K4 is engraved by the upper hole type
  • a protrusion 55 is formed that protrudes toward the inside of the hole mold.
  • 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 fourth hole mold K4).
  • 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 end angle ⁇ 3 of the projections 55 and 56 is configured to be wider than the angle ⁇ 2, and the penetration depth h4 of the projections 55 and 56 into the rolled material A is the penetration depth of the projections 45 and 46.
  • the length is shorter than h3 (that is, h4 ⁇ h3).
  • the angle ⁇ 3 is preferably 130 ° or more and 170 ° or less.
  • the 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 the third angle.
  • the four locations shown in FIG. 5 are each configured at about 90 ° (substantially perpendicular).
  • the projections 55 and 56 are pressed against each other, they are expanded and interrupts 58 and 59 are generated. That is, in the final pass in modeling with the fourth hole mold K4, the deepest part angle of the interrupts 58 and 59 (hereinafter also referred to as the interrupt angle) is ⁇ 3.
  • modeling is performed such that the divided part (part corresponding to the flange portion 80 described later) which is modeled with the formation of the interrupts 48 and 49 in the third hole mold K3 is further bent outward.
  • the portions of the upper and lower end portions of the material A to be rolled thus formed are portions corresponding to the flanges of the subsequent H-shaped steel product, and are referred to as flange portions 80 here.
  • the shaping with the fourth hole mold K4 shown in FIG. 5 is performed by at least one pass, and the rolling material A is not actively reduced in these passes. This is because the rolling material A is elongated in the longitudinal direction and the generation efficiency of the flange portion 80 is lowered.
  • the rolling modeling using the first hole mold K1 to the fourth hole mold K4 is also referred to as an edging rolling process in which the material A to be rolled is shaped to have a predetermined substantially dog-bone shape, and a material slab having a rectangular cross section is formed. Implemented in an upright position.
  • FIG. 6 is a schematic explanatory view of the fifth hole type K5.
  • the fifth hole type K5 includes an upper hole type roll 85 and a lower hole type roll 86 which are a pair of horizontal rolls.
  • the material A to be rolled formed up to the fourth hole mold K4 is rotated by 90 ° or 270 °, and until the fourth hole mold K4, the material A of the material to be rolled A is rotated.
  • the flange portions 80 located at the upper and lower ends are arranged so as to be on the rolling pitch line.
  • the web part 82 which is a connection part which connects the two flange parts 80 is reduced.
  • the upper and lower hole type rolls 85 and 86 of the fifth hole type K5 have a shape in which hollow parts 85a and 86a having a predetermined length W1 are formed at the center part of the roll body length.
  • the reduction of the web part 82 is partially performed from the first pass of the hole type to the path where the raised part 82 b is filled.
  • rolling modeling is performed in which a raised portion 82b is formed on the web portion 82 in a so-called dogbone-shaped material to be rolled.
  • the hole mold In the fifth hole mold K5, rolling modeling is performed such that the web part 82 is partially reduced and the raised part 82b is formed. Therefore, the hole mold is also referred to as a “web partial rolled hole mold”. Call it. Moreover, the length same as the width length of the protruding part 82b after formation becomes the same length as the width length W1 of the said recessed parts 85a and 86a (the escape amount W1 mentioned later).
  • the width W1 of the recesses 85a and 86a in this specification is a width at a depth that is 1 ⁇ 2 of the depth hm of the recesses 85a and 86a.
  • the escape amount W1 which will be described later, is defined according to the same rule.
  • FIG. 7 is a schematic explanatory diagram of the sixth hole type K6.
  • the sixth hole type K6 includes an upper hole type roll 95 and a lower hole type roll 96 which are a pair of horizontal rolls.
  • the raised part 82b formed in the web part 82 is erased from the material A to be rolled formed in the fifth hole mold K5, and the inner method of the web part 82 is widened. Rolling modeling is performed.
  • the sixth hole type K6 rolling is performed in which the upper and lower hole type rolls 95 and 96 are brought into contact with the raised part 82b formed in the web part 82 to reduce (erase) the raised part 82b.
  • Rolling modeling by the sixth hole mold K6 promotes the web height direction expansion and the metal flow to the flange portion 80 accompanying the rolling down of the raised portion 82b, and performs the rolling modeling without causing the flange surface reduction as much as possible. It becomes possible. Since the sixth hole type K6 erases the raised portion 82b formed in the web portion 82, it is also referred to as “a raised portion erased hole type”.
  • the web part 82 may be further subjected to widening rolling as needed for the material A to be rolled that has passed through the first hole mold K1 to the sixth hole mold K6 described above.
  • widening rolling using one or a plurality of widening hole molds may be performed in the subsequent stage of the rolling modeling with the sixth hole mold K6.
  • the hole mold for widening rolling is a conventionally known hole mold, description of the hole mold for widening rolling in this specification is omitted.
  • Rolling modeling using the above-mentioned fifth hole mold K5 and sixth hole mold K6 (and a hole mold for widening as required) rotates the material A to be rolled formed in the edging rolling process by 90 ° or 270 °. Since it is carried out in a substantially H-shaped posture, it is also called a flat rolling process.
  • a multi-pass reverse rolling is performed on the H-shaped rough shaped material 13 formed in this way by using a rolling mill row consisting of two rolling mills, an intermediate universal rolling mill 5-edger rolling mill 9, which is a known rolling mill. Is added to form the intermediate material 14. And the intermediate material 14 is finish-rolled by the finishing universal rolling mill 8 to a product shape, and the H-section steel product 16 is manufactured (refer FIG. 1).
  • 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.
  • the upper and lower end surfaces of the material A (slab) to be rolled are substantially reduced in the vertical direction.
  • the shaped rough shape 13 can be shaped.
  • 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.
  • flat modeling rolling performed after edging rolling is performed by removing the fifth hole mold K5 for forming the raised portion 82b and the raised portion 82b and widening the inner method of the web portion 82. It is supposed to be implemented in a hole type configuration provided with a six hole type K6. Thereby, it becomes possible to roll-form the H-shaped rough shaped member 13 having a larger flange width than before, and as a result, it becomes possible to manufacture an H-shaped steel product having a larger flange width than before.
  • the raised portion 82b formed on the web portion 82 is erased. However, the web portion 82 is removed along with the removal of the raised portion 82b.
  • the inner method is expanded, and between the inner surface of the flange portion 80 and the rolls (in this embodiment, the upper hole type roll 95 and the lower hole type roll 96) at the time of rolling modeling with the sixth hole type K6. There may be a gap. If a gap is generated between the inner surface of the flange part 80 and the roll, a flange left-right thickness deviation or the like is likely to occur, and rolling stability such as material permeability is likely to be impaired.
  • the rolling state that impairs the rolling stability in flat shaping rolling represented by rolling shaping with the sixth hole mold K6 is that the flange thickness unbalance occurs when the raised portion 82b is eliminated.
  • the inner surface of the flange portion 80 and the roll are required to be in contact with each other in at least one pass in rolling modeling with the sixth hole type K6.
  • the hole mold design of the sixth hole mold K6 is preferable. Or it is necessary to make the pass schedule in the sixth hole type K6 suitable.
  • FIG. 8 is a schematic explanatory view when rolling modeling is performed in a state where the inner surface of the flange portion 80 and the roll are in contact with each other in the rolling modeling with the sixth hole mold K6.
  • FIG. 8 shows only the upper half of the material A to be rolled.
  • rolling molding is performed in a state where the inner side surface 80 a of the flange portion 80 is in contact with the upper hole-type roll 95 under the pressure of the raised portion 82 b by the upper hole-type roll 95. It is preferable.
  • the state in which the inner side surface 80a of the flange portion 80 is in contact with the upper hole type roll 95 may be in such a state in all passes when the rolling shaping in the sixth hole type K6 is performed in a plurality of passes. It may be in such a state in a part pass (for example, the first pass). That is, it is only necessary that the inner side surface 80a of the flange portion 80 is in contact with the upper hole-type roll 95 in rolling modeling of at least one pass.
  • the shape of the sixth hole mold K6 is set to a predetermined shape. It is done.
  • a configuration in which the roll and the entire inner surface 80a of the flange portion 80 are in the first pass rolling modeling is desirable.
  • FIG. 9 is a schematic explanatory diagram of the configuration of a desirable sixth hole type K6, in which the roll shape is indicated by a solid line and the material A to be rolled is indicated by a mesh.
  • the configuration of the sixth hole mold K6 is such that the entire inner surface 80a of the flange portion 80 (the broken line portion in FIG. 9) is in contact with the roll, so that at least the tip of the flange portion 80 is molded. Therefore, rolling stability is maintained.
  • the moment arm to be rotated is longer on the tip side of the flange portion 80 (L1> L2 in the figure), and it is considered that rolling is likely to be stable even if asymmetric deformation occurs in the material A to be rolled.
  • the adjustment of the conditions related to the configuration of the sixth hole mold K6 can be controlled by, for example, the value of the inner diameter of the hole mold, the inclination angle of the hole facing flange portion, or the like.
  • Table 1 below shows roll hole type specifications showing a conventional hole shape design, and conditions for performing widening of the in-web method by flat rolling shaping and widening rolling without forming a raised portion in flat rolling shaping. An example is shown.
  • Table 2 below shows roll hole type specifications showing the hole type design according to the present invention. After forming the raised part, the hole type (first stage widening) that simultaneously performs the ridge removal and widening (first stage widening) The conditions including K6) in the table are shown.
  • Each of the rolls K1 to K6 shown in Table 2 corresponds to the first hole type K1 to the sixth hole type K6 according to this embodiment, and K7 to K9 are general wide hole types.
  • K2-1 and K2-2 indicate interrupt hole types having different protrusion heights, and both are hole types having a function corresponding to the second hole type K2 according to the present embodiment.
  • a pass schedule for rolling modeling in the sixth hole mold K6 is suitably designed.
  • the web accompanying the erasure of the raised portion 82b is suitably adjusted by appropriately adjusting the amount of reduction in the hole type (here, the sixth hole type K6) that performs the erasure of the raised portion, and suppressing the amount of reduction of the raised portion 82b. Expansion of the inner method of the part 82 is suppressed, and maintenance of rolling stability is realized.
  • the roll gap including the longitudinal variation of the raised portion 82 b is evaluated, and the minimum value thereof Is set so that the inner surface 80a of the flange portion 80 and the inner surface of the roll come into contact with each other.
  • the inner surface 80a of the flange portion 80 can be reliably formed by setting the first pass in the roll gap that actually matches the web portion roll gap to the height of the raised portion 82b.
  • maintenance of rolling stability is realized.
  • a suitable pass schedule it is also possible to control the contact state of the flange inner surface by adopting a pass schedule that partially erases the raised portion in the hole mold that performs the raised portion erased rolling modeling.
  • a pass schedule that partially erases the raised portion in the hole mold that performs the raised portion erased rolling modeling.
  • the web internal method expands due to the erasure (reduction) of the raised portion 82b. This makes it difficult for the inner side surface 80a to come into contact with the roll, and tends to impair rolling stability.
  • the inner surface 80a of the flange portion 80 can be reliably formed, and the rolling stability can be maintained.
  • elimination of a protruding part is performed partially, it is preferable that erasure
  • the bulging portion remaining by the universal rolling in the intermediate universal rolling mill 5 (see FIG. 1) that performs the intermediate rolling process may be reduced and erased.
  • Tables 3 and 4 shown below are examples of a pass schedule when the above-described fifth hole type K5 and sixth hole type K6 are used to form and erase the raised portion 82b, and Table 3 shows a conventional pass.
  • Table 4 is a path schedule according to the present invention.
  • the hole types K5 and K6 shown in Tables 3 and 4 correspond to the fifth hole type K5 and the sixth hole type K6 according to the present embodiment.
  • the ridge 82b is completely erased in the first pass (14th pass) in the sixth hole type K6, and the web end thickness and the web are Whereas the protrusions (protrusions) have the same thickness (100.0 mm), in the pass schedule according to the present invention, the protuberances 82b are not completely erased and the protuberances 82b remain (150.0 mm). ).
  • FIG. 10 is a schematic diagram based on a simulation showing the shape of the material to be rolled after each ridge elimination in the pass schedules in Tables 3 and 4 above, (a) is a schematic diagram in the conventional pass schedule, b) is a schematic diagram of a path schedule according to the present invention.
  • FIG. 10 (a) when the bulging part is completely erased in the rolling modeling for erasing the bulging part, with the widening of the in-web method accompanying the erasing of the bulging part, the perforated roll and the flange of the material to be rolled A gap is generated between the inner surface (see the broken line in the figure).
  • FIG. 10 is a schematic diagram based on a simulation showing the shape of the material to be rolled after each ridge elimination in the pass schedules in Tables 3 and 4 above, (a) is a schematic diagram in the conventional pass schedule, b) is a schematic diagram of a path schedule according to the present invention.
  • FIG. 10 (a) when the bulging part
  • the rolling modeling when the erasure of the raised portion is limited to a part, the rolling modeling can be completed in a state where the hole roll and the inner surface of the flange of the material to be rolled are in contact. Thereby, the left-right deformation
  • the raised portion 82b is formed at the center of the web portion 82 of the material A to be rolled, and the formed raised portion 82b It is erased in the sixth hole type K6. And, after the bulging part erasure, widening rolling of the in-web method is performed as necessary, and an H-shaped rough shaped material is formed, but in order to produce a large H-shaped steel product having a larger flange width than before, It is desirable to make the flange width of the H-shaped rough shape as large as possible.
  • the inventors finally changed the width W1 of the raised portion 82b formed in the fifth hole mold K5 (that is, the escape amount of the in-web method in the rolling modeling with the fifth hole mold K5), and finally It has been found that there is a difference in the flange width of the obtained H-shaped rough profile. This is because, as the width of the raised portion 82b is increased, the flange thickness is easily secured, but the flange width is reduced by the longitudinal stretching action of the material A to be rolled when the raised portion is subsequently erased.
  • the present inventors set the escape rate and the H-shaped roughness in order to determine a suitable range of the escape amount of the in-web method (hereinafter also simply referred to as “relief amount W1”) in rolling shaping with the fifth hole mold K5. Focusing on the relationship between the increase and decrease of the flange width after shape shaping, a suitable numerical range of the escape rate was derived.
  • FIG. 11 is a graph showing the relationship between the escape rate and the flange width increase / decrease rate after forming the H-shaped rough profile.
  • the flange width increase / decrease rate in FIG. 11 is the flange width when the escape rate is each value (12% to 56%) with the flange width when the escape rate is 0% as a reference (1.000). It is the value which showed.
  • the flange width of the H-shaped rough profile tends to increase.
  • the flange width increase / decrease is almost constant (in the graph). (Refer to the broken line part in FIG. 4). From the results shown in FIG. 11, in the case of manufacturing a large H-shaped steel product having a larger flange width than in the past, in view of the fact that rolling shaping is desired so that the flange width of the H-shaped rough profile is increased, the relief is required. It can be seen that the numerical range of the rate is preferably 25% to 50%.
  • the numerical range of the relief rate when forming the raised portion 82b is preferably 25% to 50%. It is necessary to further examine the value of the thickness of the web reduction portion 82a when the raised portion 82b is formed at the escape rate. This is because, after forming the raised portion 82b, when the rolling modeling for erasing the raised portion 82b is performed with the sixth hole mold K6, the reduced portion 82a is too thin, and the metal movement of the raised portion 82b is within the cross section. It is estimated that this is a result of the metal movement in the longitudinal direction of the material A to be rolled.
  • the present inventors use the first hole molds K1 to K6 according to the present embodiment when manufacturing H-section steel having a product flange width of 400 mm or more using a rectangular cross-section slab of 2000 ⁇ 300 mm as a material.
  • the moldability rolling stability
  • the cases where the thickness after the reduction of the reduction portion 82a was 200 mm, 160 mm, 140 mm, 120 mm, and 100 mm were set to levels 1 to 5, respectively.
  • the case where web thickness reduction was implemented without forming the protruding part 82b as a comparative level was set to level 6.
  • Table 5 below shows the pass schedule of the above level 1 to level 6, and each hole type G1, G2-2, G3-1, G3-2, G4-1, G4-2 in the table is shown below. This corresponds to the first hole type K1 to the sixth hole type K6 described in the present embodiment.
  • it is described at the bottom of Table 5 as “failure” when a passing material failure / shape failure occurs, and “good” when no passing material failure / shape failure occurs. Yes.
  • FIG. 12 is an explanatory diagram relating to warpage of the material A to be rolled, and is a schematic side view when warping occurs at the longitudinal end portion of the material A to be rolled. As shown in FIG. 12, the difference between the end portion and the steady portion when warpage occurs at the end portion in the longitudinal direction of the material A to be rolled is defined as the “warp amount”.
  • Warpage (%) Warpage amount / Length of material to be rolled with warpage
  • FIG. 13 is a graph showing the relationship between warpage and web thickness (thickness after the reduction of the reduction portion 82a). Note that the graph shown in FIG. 13 is data under a condition where the escape rate is about 33%.
  • the warpage tends to increase as the thickness of the reduced portion 82a after the reduction decreases.
  • the warpage is as small as about 3% or less, and when the thickness after the reduction of the reduction portion 82a exceeds 140 mm, the warpage is as large as about 10% or more and the shape is deteriorated. Is known to be significant.
  • the warpage generated in the material A to be rolled becomes 10% or more, the dimensional shape deterioration after the next pass is remarkably difficult to continue rolling. That is, from the results shown in FIG.
  • the threshold for warping is set to 10% because when the maximum warpage amount of about several hundred mm is generated at a rate of 10% with respect to the number m of the ends of the material to be rolled, a difference in the upper and lower meat amount occurs. This is because it is easily confirmed by those skilled in the art, and the value that clearly indicates that it is difficult to continue rolling in operation is 10%. In addition, when the warpage is several percent (less than 10%) under the same conditions, warpage of about several tens of millimeters is observed in normal operation, but it is a person skilled in the art that there is no problem in operation. Can be easily inferred.
  • the web thickness thickness after the reduction of the reduction portion 82a
  • the web thickness is set to a predetermined value (for example, 140 mm) or more in the fifth hole mold K5
  • the web thickness is further reduced in the subsequent sixth hole mold K6. It is also possible to reduce the thickness of the web.
  • FIG. 14 is a graph showing a relationship between the thickness after the reduction of the reduction portion 82a (finished web thickness after the reduction) and the height before the reduction of the raised portion 82b in the fifth hole mold K5.
  • the “relief rate” described above with reference to FIG. 11 is set to a suitable condition (for example, 25% to 50%)
  • the extending action in the longitudinal direction of the raised portion 82b is small, and the height of the raised portion is increased by the hole shape.
  • the ridge height remains the slab thickness of the material.
  • the slab thickness is 300 mm and the height of the raised portion 82b is set to a sufficient height
  • the raised portion height remains at 300 mm.
  • the material to be rolled A is formed using four hole molds of the first hole mold K1 to the fourth hole mold K4, and then the fifth hole mold K5, the sixth hole mold K6 (
  • the number of hole types for performing the rough rolling process is not limited to this, and the first hole is not limited to this.
  • the rolling shaping process shown in the mold K1 to the fourth hole mold K4 may be performed using more hole molds. That is, the hole shape configuration shown in the above embodiment is an example, and the number of hole shapes engraved in the sizing mill 3 and the rough rolling mill 4 can be arbitrarily changed, and the rough rolling process is preferably performed. It is suitably changed to such an extent that it can be performed.
  • the upper and lower end portions (slab end surfaces) of the material A to be rolled are interrupted, and the respective parts divided into right and left by the interrupt are left and right.
  • the modeling method of performing the bending process and forming the flange portion 80 is described.
  • the rolling modeling technique using the sixth hole mold K6 according to the present invention is not applied only to the material A to be rolled that is modeled by such a technique.
  • the present invention can also be applied to a conventional H-shaped rough shape material (so-called dog bone material).
  • the present invention can be applied to a manufacturing method for manufacturing H-section steel using, for example, a slab having a rectangular cross section as a raw material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

Le procédé selon l'invention permet à un laminage de forme plate d'une grande préforme d'être réalisé sans créer de problèmes tels que l'allongement dans le sens de la hauteur de la bande et la déformation d'une partie équivalente à une bride et à des produits à poutrelle en H ayant une bride plus large que les produits à poutrelle en H classiques d'être produits de manière efficace et stable. Dans ce procédé, une étape de laminage de dégrossissage comprend une étape de laminage vertical et une étape de laminage à plat qui consiste à faire tourner un matériau de laminage qui a subi l'étape de laminage vertical et à enrouler la bande. Parmi les calibres utilisés pour réaliser l'étape de laminage à plat, au moins un calibre présente des cylindres de calibre supérieur et inférieur, sur le centre longitudinal du corps de rouleau, dotés d'un évidement pour former une arête le long du centre de la bande du matériau de laminage. Les calibres qui sont utilisés dans la réalisation de l'étape de laminage à plat comprennent en outre un calibre d'effacement d'arête qui appuie sur l'arête formée sur le matériau de laminage et élargit la dimension interne de la bande du matériau de laminage. Le laminage de forme utilisant le calibre d'effacement d'arête est réalisé sur le matériau de laminage une fois que l'arête a été formée sur celui-ci, le calibre ayant l'évidement pour former l'arête et le laminage de forme pour former l'arête n'est pas effectué après la pression vers le bas sur l'arête.
PCT/JP2019/004082 2018-02-09 2019-02-05 Procédé de production pour des poutrelles en h WO2019156078A1 (fr)

Priority Applications (4)

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US16/755,860 US20200391261A1 (en) 2018-02-09 2019-02-05 Method for producing h-shaped steel
JP2019520918A JP6614396B1 (ja) 2018-02-09 2019-02-05 Ｈ形鋼の製造方法
CN201980006415.0A CN111479638A (zh) 2018-02-09 2019-02-05 H型钢的制造方法
EP19751407.8A EP3698894A1 (fr) 2018-02-09 2019-02-05 Procédé de production pour des poutrelles en h

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JP2018022105 2018-02-09

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CN114042750A (zh) * 2021-10-27 2022-02-15 中重科技(天津)股份有限公司 一种热轧h型钢在线调宽的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57146405A (en) 1981-03-05 1982-09-09 Kawasaki Steel Corp Broadside rolling method and rolling roll for large sized blank material for rough shape
JPS57171501A (en) * 1981-04-13 1982-10-22 Kawasaki Steel Corp Rolling method for rough shape billet
JPH0531553A (ja) * 1991-07-30 1993-02-09 Kawasaki Steel Corp Ｈ形鋼用鋳片とその鋳造方法およびｈ形鋼用粗形材の圧延方法
JPH0788501A (ja) 1993-09-21 1995-04-04 Nippon Steel Corp Ｈ形鋼用中間粗形鋼片の製造方法
JP2017221947A (ja) * 2016-06-13 2017-12-21 新日鐵住金株式会社 Ｈ形鋼の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57146405A (en) 1981-03-05 1982-09-09 Kawasaki Steel Corp Broadside rolling method and rolling roll for large sized blank material for rough shape
JPS57171501A (en) * 1981-04-13 1982-10-22 Kawasaki Steel Corp Rolling method for rough shape billet
JPH0531553A (ja) * 1991-07-30 1993-02-09 Kawasaki Steel Corp Ｈ形鋼用鋳片とその鋳造方法およびｈ形鋼用粗形材の圧延方法
JPH0788501A (ja) 1993-09-21 1995-04-04 Nippon Steel Corp Ｈ形鋼用中間粗形鋼片の製造方法
JP2017221947A (ja) * 2016-06-13 2017-12-21 新日鐵住金株式会社 Ｈ形鋼の製造方法

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US20200391261A1 (en) 2020-12-17
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CN111479638A (zh) 2020-07-31
JPWO2019156078A1 (ja) 2020-02-27

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