WO2018186379A1 - フランジを有する鋼矢板の製造方法及び製造設備 - Google Patents

フランジを有する鋼矢板の製造方法及び製造設備 Download PDF

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Publication number
WO2018186379A1
WO2018186379A1 PCT/JP2018/014214 JP2018014214W WO2018186379A1 WO 2018186379 A1 WO2018186379 A1 WO 2018186379A1 JP 2018014214 W JP2018014214 W JP 2018014214W WO 2018186379 A1 WO2018186379 A1 WO 2018186379A1
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WIPO (PCT)
Prior art keywords
flange
hole
rolling
steel sheet
sheet pile
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Application number
PCT/JP2018/014214
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English (en)
French (fr)
Japanese (ja)
Inventor
慎也 林
浩 山下
和典 関
雅典 河合
Original Assignee
新日鐵住金株式会社
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 新日鐵住金株式会社 filed Critical 新日鐵住金株式会社
Priority to EP18781109.6A priority Critical patent/EP3603832A1/en
Priority to JP2018554413A priority patent/JP6493636B2/ja
Priority to CN201880021446.9A priority patent/CN110475623A/zh
Priority to US16/495,033 priority patent/US20200269294A1/en
Publication of WO2018186379A1 publication Critical patent/WO2018186379A1/ja
Priority to PH12019502224A priority patent/PH12019502224A1/en

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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
    • B21B1/082—Piling sections having lateral edges specially adapted for interlocking with each other in order to build a wall
    • 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
    • B21B1/095—U-or channel sections
    • 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
    • B21B1/14—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 in a non-continuous process, i.e. at least one reversing stand
    • 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
    • B21B2001/081—Roughening or texturing surfaces of structural sections, bars, rounds, wire rods
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02—Sheet piles or sheet pile bulkheads
    • E02D5/03—Prefabricated parts, e.g. composite sheet piles
    • E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel

Definitions

  • the present invention relates to a manufacturing method and manufacturing equipment for a steel sheet pile having a flange such as a hat-shaped steel sheet pile or a U-shaped steel sheet pile.
  • a steel sheet pile having joints at both ends has been manufactured by a perforated rolling method.
  • a perforated rolling method As a general process of the perforated rolling method, it is known that a rectangular material heated to a predetermined temperature in a heating furnace is first rolled in order by a roughing mill, an intermediate rolling mill and a finishing mill equipped with a perforated mold. It has been.
  • a perforated rolling method for example, in Patent Document 1, a plurality of perforations are arranged on a roll in rough rolling, intermediate rolling, and finish rolling, and each of these perforations is rolled one or two passes to form a hat-shaped steel sheet pile. Techniques for manufacturing are disclosed.
  • Patent Document 2 a hole mold is formed so that the stretch balance between the web and the flange is maintained in the manufacture of the U-shaped steel sheet pile, and the material to be rolled is reciprocated several times in the same hole mold for rolling. Techniques to do are disclosed. Further, for example, Patent Document 3 discloses a technique for reducing the placing resistance during the construction of the steel sheet pile, and proposes a configuration in which a gently inclined portion is provided in the flange portion.
  • Patent Document 4 discloses a Z-shaped steel including a step of forming a preform having two flange / web transition sections parallel to the rolling surface and a central section inclined with respect to the rolling surface in the vicinity of the neutral line.
  • a manufacturing technique of a sheet pile is disclosed.
  • reverse rolling in the present specification refers to a process in which rolling is repeatedly performed by reciprocating a multi-pass rolled material while gradually narrowing a roll gap in the same hole mold constituted by upper and lower hole rolls. It is.
  • Patent Document 4 is presumed to be a technique for performing one-pass one-pass rolling, so-called reverse, in which the upper and lower roll gaps are gradually narrowed with the same hole mold and multiple-pass rolling is performed. There is no description of rolling. This is because, in the technique described in Patent Document 4, when reverse rolling is performed with the same hole shape, stretching is uneven for each part in the cross section, metal flow occurs, and the filling state of the joint portion changes. In addition, it is believed that the flange / web transition section stretch is geometrically larger than the center section stretch and is more likely to twist.
  • Patent Document 4 does not mention anything about the generation of a flange wave that may occur during reverse rolling, and naturally does not mention any suppression of the flange wave.
  • an object of the present invention is to provide a steel having a flange capable of suppressing the occurrence of shape defects such as a flange wave due to reverse rolling and improving product dimensional accuracy and rolling stability.
  • the purpose is to provide sheet pile manufacturing technology.
  • a manufacturing method for forming a steel sheet pile having a flange from a material to be rolled by perforated roll rolling, and reverses the material to be rolled by the same hole die includes a step of forming a first flange portion straddling a neutral line and second and third flange portions disposed on both sides of the first flange portion.
  • the hole mold has a first flange facing portion for forming the first flange portion, a second flange facing portion for forming the second flange portion, and a third flange portion. And a third flange facing portion, wherein an inclination angle of the first flange facing portion with respect to a horizontal plane is larger than an inclination angle of the second and third flange facing portions.
  • the reverse rolling step includes a step of forming a web corresponding portion and an arm corresponding portion, and the hole mold forms a web facing portion for forming the web corresponding portion and the arm corresponding portion.
  • An arm facing portion, and the hole type includes a web side flange facing portion group including at least one second flange facing portion and an arm side flange facing portion group including at least one third flange facing portion. And a second straight line connecting a boundary portion between the web side flange facing portion group and the web facing portion and a boundary portion between the arm side flange facing portion group and the arm facing portion.
  • the flange facing portion may have a convex shape in the flange outer direction
  • the third flange facing portion may have a convex shape in the flange inner direction.
  • rolling may be performed such that the flange extension ⁇ f1 in the first flange portion is smaller than the flange extensions ⁇ f2 and ⁇ f3 in the second flange portion and the third flange portion.
  • the step of forming the first flange portion, the second flange portion, and the third flange portion may be an intermediate rolling step.
  • the hole mold may have a hole shape in which both ends in the width direction are open.
  • the bent flange-corresponding portion formed on the material to be rolled by the step of forming the first flange portion, the second flange portion, and the third flange portion is formed into a desired flat shape by rolling in the latter-stage hole mold of the step. It may be rolled and formed into a shape.
  • rolling may be performed so that the flange stretching ⁇ f1 in the first flange portion is equal to or less than the web stretching ⁇ w.
  • the steel sheet pile may be a hat-shaped steel sheet pile.
  • a rolling mill that includes a rolling mill and performs the reverse rolling includes a first flange portion straddling a neutral line, and a hole mold that forms second and third flange portions disposed on both sides of the first flange portion.
  • the hole mold includes a first flange facing portion for forming the first flange portion, a second flange facing portion for forming the second flange portion, and a third flange portion.
  • a third flange-facing portion wherein the first flange-facing portion has an inclination angle greater than the inclination angle of the second and third flange-facing portions with respect to a horizontal plane.
  • Manufacturing facility of the plate is provided.
  • the rolling mill for performing reverse rolling includes a web corresponding part and a hole mold for forming an arm corresponding part, and the hole mold forms a web facing part for forming the web corresponding part and the arm corresponding part.
  • An arm-facing portion, and the hole mold includes a web-side flange-facing portion group including at least one second flange-facing portion and an arm-side flange facing including at least one third flange-facing portion.
  • the second flange facing portion may be convex in the flange outer direction
  • the third flange facing portion may be convex in the flange inner direction
  • the flange extension ⁇ f1 in the first flange portion may be smaller than the flange extensions ⁇ f2 and ⁇ f3 in the second flange portion and the third flange portion.
  • the hole mold may be a hole mold provided in an intermediate rolling mill.
  • the hole mold may have a hole shape in which both ends in the width direction are open.
  • a mold may be provided.
  • the flange extension ⁇ f1 in the first flange portion may be equal to or less than the web extension ⁇ w.
  • the steel sheet pile may be a hat-shaped steel sheet pile.
  • the present invention it is possible to suppress the occurrence of shape defects such as flange waves due to reverse rolling, and to improve product dimensional accuracy and rolling stability.
  • the material to be rolled having a substantially hat-shaped steel sheet pile shape is described as being rolled in a posture in which the web is positioned below the flange (so-called U posture), but naturally the scope of application of the present invention is as follows. It extends to rolling in other postures (for example, reverse U posture).
  • the applicable range of this invention is a steel sheet pile product which has various flanges, such as a hat shape and U shape
  • the steel sheet pile product manufactured in this Embodiment is demonstrated as what is a hat type steel sheet pile product. .
  • the material A to be rolled described below indicates a steel material that is rolled when a hat-shaped steel sheet pile product is manufactured, and the steel material that is passed through the rolling line L is collectively referred to as the material A to be rolled.
  • the material A to be rolled in each rolling mill is described with a different name (A1 to A5 described below) as necessary.
  • the material A to be rolled has a substantially hat-shaped shape, a web-corresponding portion 3 that is substantially horizontal, flange-corresponding portions 5 and 6 that are connected to both ends of the web-corresponding portion 3 at a predetermined angle, and each flange.
  • part which comprises the to-be-rolled material A is illustrated and demonstrated with said each code
  • the rolling direction is referred to as the “longitudinal direction” of the material to be rolled
  • the direction perpendicular to the longitudinal direction and parallel to the rolling roll axis is the “width direction” of the material to be rolled.
  • the direction perpendicular to both the longitudinal direction and the width direction is referred to as the “height direction” of the material to be rolled and will be described.
  • thickness reduction of the material to be rolled refers to plate thickness reduction with respect to the thickness direction of the material to be rolled.
  • FIG. 1 is an explanatory diagram of a rolling line L for producing a hat-shaped steel sheet pile, a rolling mill provided in the rolling line L, and the like.
  • the rolling progress direction of the rolling line L is a direction indicated by an arrow, and the material A to be rolled flows in the direction, and each of the perforating rolling mills on the line (rough rolling mill and intermediate rolling described below).
  • Rolling machine, finish rolling machine), and product is formed.
  • the some conveyance roll which is not shown in figure is installed on the rolling line L, and the to-be-rolled material A is conveyed on the rolling line L by these conveyance rolls.
  • a rolling line L includes a roughing mill (BD) 17, a first intermediate rolling mill (R1) 18, a second intermediate rolling mill (R2) 19, a finish rolling mill ( F) 30 is arranged.
  • BD roughing mill
  • R1 first intermediate rolling mill
  • R2 second intermediate rolling mill
  • F finish rolling mill
  • the material A to be rolled such as slab and bloom, heated in a heating furnace (not shown) (not shown) is sequentially rolled in the roughing mill 17 to the finishing mill 30.
  • a heating furnace not shown
  • the finishing mill 30 As a result, the hat-shaped steel sheet pile as the final product is manufactured.
  • FIGS. 2 to 6 a cross section of the material A to be rolled when the reduction in each hole mold is completed is indicated by a one-dot chain line for reference.
  • FIG. 2 is a schematic cross-sectional view showing a hole shape of the first hole mold 49 (hereinafter also simply referred to as a hole mold 49).
  • the hole mold 49 includes an upper hole roll 45 and a lower hole roll 48.
  • a hole die 49 constituted by the upper hole roll 45 and the lower hole roll 48 is provided in, for example, the roughing mill 17, and thickness reduction is performed on the entire material to be rolled A by hole rolling in the hole mold 49 (that is, Rough rolling) is performed.
  • hole rolling is performed such that a slab heated to a predetermined temperature in a heating furnace approximates a hat shape, and a rough material A1 indicated by a one-dot chain line in FIG. 2 is formed.
  • the rough rolling at this time may be performed, for example, by reverse rolling in the same hole mold 49.
  • FIG. 3 is a schematic cross-sectional view showing a hole shape of a second hole mold 59 (hereinafter also simply referred to as a hole mold 59).
  • the hole mold 59 includes an upper hole roll 55 and a lower hole roll 58.
  • a hole mold 59 composed of the upper hole roll 55 and the lower hole roll 58 is provided, for example, in the first intermediate rolling mill 18, and the thickness of the whole material A to be rolled is reduced by hole rolling in the hole mold 59 ( That is, the first intermediate rolling) is performed.
  • thickness reduction is performed at the same time as the nail height of the claw portions 14 and 15 is adjusted to a desired height.
  • the rough material A1 carried out from the hole mold 49 is further shaped into a hat. Pore rolling is performed so as to approximate the shape. Thereby, 1st intermediate material A2 shown to the dashed-dotted line in FIG. 3 is modeled. Note that the rolling here is performed, for example, by reverse rolling in the same hole mold 59.
  • FIG. 4 is a schematic cross-sectional view showing a hole shape of a third hole mold 69 (hereinafter also simply referred to as a hole mold 69).
  • the hole mold 69 includes an upper hole roll 65 and a lower hole roll 68.
  • a hole die 69 constituted by the upper hole roll 65 and the lower hole roll 68 is provided, for example, in the second intermediate rolling mill 19, and thickness reduction is performed on the whole material to be rolled A by hole rolling in the hole die 69 ( That is, second intermediate rolling) is performed.
  • hole rolling is performed so that the first intermediate material A2 unloaded from the hole mold 59 is brought closer to a hat shape, and the second intermediate material A3 indicated by the one-dot chain line in FIG. 4 is formed.
  • the hole mold 69 has a shape in which both end portions in the width direction are open, the claw portions 14 and 15 of the material A to be rolled have a shape extending in the width direction due to thickness reduction. Note that the rolling here is performed, for example, by reverse rolling in the same hole mold 69.
  • FIG. 5 is a schematic sectional view showing a hole shape of a fourth hole mold 79 (hereinafter also simply referred to as a hole mold 79).
  • the hole mold 79 includes an upper hole roll 75 and a lower hole roll 78.
  • a hole die 79 constituted by the upper hole roll 75 and the lower hole roll 78 is provided in, for example, the second intermediate rolling mill 19, and the claw portions 14 and 15 of the material A to be rolled are formed by the hole die 79, for example. It is done with emphasis.
  • the second intermediate material A4 is formed by performing the reduction so that the claw heights of the claw portions 14 and 15 in the state extended by the third hole mold 69 are aligned to a desired height. . Note that the rolling here may reduce the thickness.
  • FIG. 6 is a schematic sectional view showing a hole shape of a fifth hole mold 89 (hereinafter also simply referred to as a hole mold 89).
  • the hole mold 89 includes an upper hole roll 85 and a lower hole roll 88.
  • a hole mold 89 constituted by the upper hole roll 85 and the lower hole roll 88 is provided in the finishing mill 30, for example, and the claw portions 14 and 15 are mainly bent with respect to the material A to be rolled by the hole mold 89.
  • Molding ie, finish rolling
  • the second intermediate material A4 is subjected to reduction using a finishing material A5 having a substantially hat shape (substantially hat-shaped steel sheet pile product shape). Note that finish rolling is usually not performed by reverse rolling but by rolling of only one pass.
  • the material A to be rolled is pierced and finally the finishing material A5 is formed.
  • the configurations of the first to fifth hole molds described above in the present embodiment are merely examples, and are not limited to the illustrated forms.
  • the shape of the holes and the increasing / decreasing arrangement of the modified hole types of various hole types can be changed as appropriate according to conditions such as equipment conditions and product dimensions. Further, depending on the type of material, it is conceivable to separately provide a hole mold such as a preformed hole mold used in the rough modeling process from the material.
  • the rolling is performed while maintaining the balance between the extension of the web corresponding part 3 and the flange corresponding parts 5 and 6. 3 and 4, since the upper and lower hole rolls have different upper and lower roll diameters depending on the part, the relative sliding speed between the material to be rolled A (particularly the flange-corresponding portions 5 and 6) and the roll is the part. It depends on. In the flange-corresponding portions 5 and 6, in a portion where the difference between the upper and lower roll diameters is large, the elongation of the material to be rolled is suppressed by the peripheral speed difference between the upper and lower rolls.
  • the elongation of the flange near the neutral line tends to be relatively large relative to the elongation of the web.
  • 6 is subjected to a compressive stress in the longitudinal direction from the inside of the roll bite. Further, the buckling limit stress is also reduced, and as a result, the flange wave is likely to be remarkably generated.
  • flange waves can be suppressed by designing the shape of the hole shape in consideration of flange stretching and web stretching in relation to the shape of the previous hole shape.
  • the hole mold 69 which is the latter hole mold, rolls the material to be rolled A (especially the flange-corresponding portions 5 and 6) more thinly. Form defects such as occurrence tend to be remarkable. In addition, in the process closer to finish rolling, when a shape defect occurs, it tends to be directly connected to a product shape defect. That is, from the viewpoint of product dimensional accuracy and rolling stability, it is important to solve the above-described problems particularly in the hole mold 69 which is the latter hole mold.
  • the present inventors have intensively studied the shapes of the hole molds 59 and 69 described with reference to FIGS. Invented a hole shape that satisfies the above conditions.
  • the detailed shape of the hole mold 69 ′ is described with reference to the drawings, in which the shape of the hole mold 69 is further improved so that the flange wave is not generated.
  • the hole die targeted in the present invention performs thickness reduction on the whole material A to be rolled. It is a hole type, and is not limited to the hole types 59 and 69.
  • FIG. 7 is a schematic explanatory view of a hole mold 69 ′ having an improved configuration of the third hole mold 69.
  • FIG. 7A is a schematic overall view
  • FIG. 7B is a portion facing the flange corresponding portion 6. The enlarged view of the vicinity (the part enclosed with the broken line in Fig.7 (a)) is shown.
  • FIG. 7B shows a state after rolling in the hole mold 69 ′, and the rolled material A is shown by a one-dot chain line.
  • components having the same functional configuration as the hole mold 69 described with reference to FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.
  • the facing portion 100 facing the flange-corresponding portion 6 of the material to be rolled A is different in shape from the hole mold 69, specifically, the side closer to the web. In this order, it is composed of a plurality of flange facing portions 100a, 100b, 100c having different inclinations. Regarding these flange facing portions 100a, 100b, and 100c, in this specification, the flange facing portion 100b is referred to as a “first flange facing portion”, and the flange facing portions 100a and 100c disposed on both sides thereof are referred to as “second flange facing portions”. It may be defined and referred to as “third flange facing portion”.
  • first flange part the part of the flange corresponding part 6 formed by rolling by the flange facing part 100b located at the center
  • second flange part each part of the flange corresponding part 6 disposed on both sides thereof (by the flange facing parts 100a and 100c).
  • the part to be rolled and shaped) may be defined and referred to as “second flange part” and “third flange part”.
  • second flange part and “third flange part”.
  • Fig.7 (a) about the part 101 which opposes the flange corresponding
  • the inclination angles of the flange facing portions 100a, 100b, and 100c with respect to the horizontal line are ⁇ f2, ⁇ f1, and ⁇ f3, respectively, and ⁇ f1 is larger than ⁇ f2 and ⁇ f3. Also, ⁇ f2 and ⁇ f3 may be equal angles.
  • Spaces tf2, tf1, and tf3 (also referred to as roll gaps) between the upper hole roll 65 and the lower hole roll 68 in the flange facing portions 100a, 100b, and 100c are respectively constant (upper hole roll 65 and lower hole roll 68).
  • the angles ⁇ f2, ⁇ f1, and ⁇ f3 of the upper hole roll 65 and the lower hole roll 68 are equal.
  • the angles ⁇ f2, ⁇ f1 and ⁇ f3 are the same as those of the upper hole roll 65 and lower hole roll 68. What is necessary is just to set it as the average value of the angle which a flange opposing part and a horizontal line make.
  • the inclination angles ⁇ f2, ⁇ f1, and ⁇ f3 are substantially the same even if they are defined by the angle formed by the center line S and the horizontal line in the roll gap of the upper and lower hole type rolls.
  • the flange facing portion 100b is configured at a position so as to straddle the neutral line O in the height direction.
  • the flange facing portion 100a is positioned closer to the web than the flange facing portion 100b, and is close to the arm (joint).
  • the flange facing portion 100c is located on the side. That is, the flange facing portion 100b is positioned so as to straddle the neutral line O, and the flange facing portions 100a and 100c are positioned on both sides thereof.
  • the stretching per pass is defined by the ratio of the thickness before rolling to the thickness after rolling (after 1 pass), and the thickness is represented by the roll gap in the plate thickness direction in the hole die 69 ′.
  • the amount of roll gap reduction in the vertical direction of one pass during reverse rolling is ⁇ g
  • the stretching ⁇ f1, ⁇ f2, and ⁇ f3 per pass of the flange facing portions 100b, 100a, and 100c are expressed by the following equations (1) to (3 ).
  • tf′1, tf′2, and tf′3 are roll gaps corresponding to the thickness before rolling of the flange corresponding portions 6 corresponding to the flange facing portions 100b, 100a, and 100c in the hole mold 69 ′.
  • tf1, tf2, and tf3 are roll gaps corresponding to the thicknesses of the flange corresponding portions 6 that are rolled in the flange facing portions 100b, 100a, and 100c in the hole mold 69 ′. That is, by setting ⁇ f1 to an angle larger than ⁇ f2 and ⁇ f3 based on the relationship between tf1, tf2, and tf3, the following formulas (4) and (5) are satisfied in rolling with the hole mold 69 ′. ⁇ f1 ⁇ f2 (4) ⁇ f1 ⁇ f3 (5)
  • the above formulas (1) to (3) show the stretching per one pass of rolling, but the formulas (1) to (3) also apply to the case of total stretching in reverse rolling performed in a plurality of passes.
  • the material A to be rolled formed by the hole mold 69 ′ has a bent shape having a plurality of inclination angles at the flange corresponding parts 5 and 6.
  • This shape is a hole type downstream of the hole mold 69 ′ provided in the intermediate rolling mill, for example, the fourth hole mold 79, the fifth hole mold 89 of the finishing mill 30 (finish rolling process), or those.
  • a desired flat flange shape (a flange shape of a hat-shaped steel sheet pile product) is obtained by both hole types. In such flange flattening, reverse rolling is not performed.
  • after bending back of the flange part there may be a streak-like trace in the longitudinal direction due to the difference in the scale adhesion state with the other part at the boundary part of the bent part. It does not reduce the strength of the part, and does not affect the quality of the steel sheet pile.
  • the effect of suppressing the generation of the flange wave is realized by lowering relative to the flange extension at a position distant from the neutral line O.
  • by reducing the angles ⁇ f2 and ⁇ f3 an increase in the height of the flange is suppressed, and the extension of the cross section of the flange corresponding portion 6 is maintained.
  • the flange facing portion (100a of the hole mold 69 ′) is considered.
  • the angle ⁇ f2 and ⁇ f3 should be designed so that the length of the center line S corresponding to the flange 69 of the hole mold 69 is the same as the length of the center line and the horizontal position of the joint does not change. It ’s fine. That is, when reverse rolling is performed with the improved hole mold 69 ′, the flange extension is reduced in the flange facing portion 100b as compared to the hole mold 69 shown in FIG.
  • the flange facing portions 100a and 100c are compared with the hole mold 69. Since the flange extension increases, the flange as a whole can maintain the same flange cross-section extension as the hole mold 69. In addition, if the line length of the center line S corresponding to the flange facing part (100a, 100b, 100c) of the hole mold 69 ′ is the same as the line length of the center line of the flange facing part of the hole mold 69, it means completely the same. However, it is sufficient that the error is within the same range (for example, less than ⁇ 1% with respect to the length of the center line of the flange facing portion).
  • the flange extension ⁇ f1 in the steeply inclined portion 100b and the web corresponding portion 3 are used. It is preferable to set the angle ⁇ f1 so that the relationship with the stretching ⁇ w satisfies the following formula (6). ⁇ f1 ⁇ ⁇ w (6) As a more detailed condition, it is desirable that ⁇ f1 / ⁇ w per path be within a range of 0.967 ⁇ ⁇ f1 / ⁇ w ⁇ 1.000. The reason for this numerical value will be described in an embodiment described later.
  • the extension of the flange corresponding part in the vicinity of the neutral line O is expressed in relation to the extension of the web in the technique of the present invention.
  • the extension of the arm corresponding portions 8 and 9 and the extension of the web corresponding portions 5 and 6 are substantially equal, and since the U-shaped steel sheet pile has no arm corresponding portion, the vicinity of the neutral line O
  • the extension of the flange-corresponding portion can be substantially expressed in relation to the web extension.
  • the stretching ⁇ w of the one-pass web during reverse rolling is expressed by the following formula (7).
  • tw ′ is a roll gap corresponding to the thickness before rolling of the web corresponding portion 3 in the hole mold 69 ′.
  • tw is a roll gap corresponding to the thickness of the web corresponding part 3 rolled by the hole mold 69 ′.
  • ⁇ w is an inclination angle with respect to the horizontal line of the roll gap corresponding to the web corresponding portion 3.
  • the thicknesses of the flange facing portions 100a, 100b, and 100c in the final pass are excluded in the hole die 69 ′ immediately before finish rolling, except for errors due to roll wear and the like.
  • the hole shape is designed such that the inclination angle ⁇ f1 of the flange facing portion 100b is different from the inclination angles ⁇ f2 and ⁇ f3 of the flange facing portions 100a and 100c, each thickness of the intermediate path of the hole mold 69 ′ is different. It will not be constant.
  • the inclination angle and width of the facing portion may be determined.
  • the flange extension in the vicinity of the neutral line O can be reduced, and the compressive stress generated in this portion can be reduced.
  • the hole shape of the hole mold 69 ′ provided in the second intermediate rolling mill 19 is a shape having a plurality of flange facing portions 100a, 100b, 100c having different inclination angles.
  • the flange corresponding portions in the rolling modeling with the hole 69 ' It is possible to reduce the compressive stress generated in the vicinity of the neutral line O of 6 and suppress the generation of the flange wave. Furthermore, it is possible to reduce the restoration of the flange thickness in which meat gathers in the vicinity of the neutral line of the flange-corresponding portion 6 in reverse rolling, and the generation of flange waves is further suppressed.
  • the extension of the flange that occurs in the flange facing portions 100a and 100c is relatively increased compared to the extension of the flange that occurs in the vicinity of the neutral line O (that is, the extension of the flange in the flange facing portion 100b).
  • the compressive stress which arises also increases, in addition to being away from the neutral line O, since the metal flow to the web corresponding
  • the portions corresponding to the flange facing portions 100 a and 100 c are connected to the web corresponding portion 3 and the arm corresponding portion 9 and are not easily buckled. Hard to do.
  • the hole shape of the hole mold 69 ' is a shape having a plurality of flange facing portions 100a, 100b, 100c having different inclination angles, so that the conventional hole shape (hole) shown in FIG. Compared with rolling modeling with the die 69), it is possible to suppress the flange wave generated near the neutral line O of the flange-corresponding portions 5 and 6 of the material A to be rolled, thereby improving the product dimensional accuracy and rolling stability. Is done.
  • the extension of the flange corresponding portions 5 and 6 is larger than the extension of the web corresponding portion 3, and the balance can be maintained. In some cases, the flange wave cannot be suppressed.
  • the inclination angle ⁇ f1 of the steeply inclined portion 100b is made larger than the flange inclination angle of the conventional hole shape, and the flange facing portion 100a and By making it larger than 100c, an increase in the height of the material A to be rolled during rolling modeling can be suppressed, and the flange wave can be effectively suppressed.
  • the subject to which the technique of the present invention is applied and the hole shape is improved is described as the third hole 69, and particularly regarding the rolling shaping of the flange corresponding portion 6 of the material A to be rolled, FIG.
  • the scope of application of the present invention is not limited to this. That is, in the rolling modeling with the third hole mold 69, the present invention can be applied to both the flange corresponding portions 5 and 6, and can also be applied to the rolling modeling of the second hole mold 59. That is, the same improvement can be applied to the hole mold 59 described with reference to FIG. 3 to suppress, for example, a flange wave generated in the first intermediate rolling.
  • the technique of the present invention may be applied to the hole shape of both the second hole mold 59 and the third hole mold 69.
  • the second hole mold 59 and the third hole mold 69 whose main components are thickness reduction
  • the second hole mold 59 has a hole shape in which both ends in the width direction are opened, and the third hole mold 69 is provided.
  • the same improvement can be applied to the case where the hole shape is such that the nail height is simultaneously formed.
  • the hole shape of the hole mold 69 ′ has been described as a shape having a plurality of flange facing portions 100a, 100b, and 100c having different inclination angles, but the important point of the technology of the present invention is that In the hole mold for performing intermediate rolling, the inclination angle ⁇ f1 of the flange facing portion 100b in the vicinity of the neutral line O is set to a larger angle than that of other flange facing portions, and the compressive stress acting on the material A to be rolled is reduced in the vicinity of the neutral line O. There is to make it.
  • the hole shape of the intermediate rolling mill is configured as a shape having a plurality of flange facing portions having different inclination angles
  • the three flange facing portions as shown in FIG.
  • the inclination angle ⁇ f1 of the flange facing portion 100b in the vicinity of the neutral line O is larger than that of other flange facing portions
  • any number of flange facing portions having different inclination angles may be used. That is, for example, as shown in FIG. 10, a hole mold for performing intermediate rolling may be configured to have four or more flange facing portions having different inclination angles.
  • the boundary part on the arm side (of the material to be rolled) and the web side (of the material to be rolled) With respect to the straight line connecting the boundary portion, it is convex in the flange inner side on the arm side from the flange facing portion near the neutral line O, and is convex in the flange outer direction on the web side from the flange facing portion in the vicinity of the neutral line O. May be.
  • the shapes of the flange facing portions 100a to 100c do not necessarily have to be linear. If the inclination angles of the flange facing portions 100a, 100b, and 100c are in a suitable condition as shown in the above formulas (4) to (6), for example, part or all of the flange facing portions 100a to 100c are curved. It may be constituted by.
  • the steeply inclined portion 100b is defined as a range between the intersection with the flange facing portion 100a and the intersection with the flange facing portion 100c, and the steeply inclined portion 100b is configured to straddle the neutral line O.
  • FIG. 8 is a schematic explanatory view according to a modification of the present invention, and is a schematic enlarged view showing an example of the vicinity of a portion facing the flange corresponding portion 6.
  • the flange facing portions 100a and 100c are configured in a curved shape.
  • the process of performing reverse rolling includes at least a web corresponding portion 3 connected to a flange portion (also referred to as a web side flange portion) including at least one second flange portion, and a third flange portion. It is preferable to include a step of forming an arm corresponding portion 9 connected to a flange portion (also referred to as an arm side flange portion) including one.
  • the hole mold according to the present invention preferably includes a web facing portion 100 d for forming the web corresponding portion 3 and an arm facing portion 100 e for forming the arm corresponding portion 9.
  • the hole type includes a web side flange facing portion group including at least one flange facing portion 100a (second flange facing portion) and an arm side flange including at least one flange facing portion 100c (third flange facing portion). It is preferable to provide an opposing portion group.
  • the boundary between the web side flange facing portion group and the web facing portion 100d is Pa
  • the boundary between the arm side flange facing portion group and the arm facing portion 100e is Pc. In the example shown in FIG.
  • the arm side boundary portion Pc (the boundary between the arm facing portion 100e and the flange facing portion 100c facing the arm corresponding portion 9) and the web side boundary Pa (the web corresponding portion in the hole 65).
  • the flange facing portion 100 a has a curved shape that protrudes outwardly from the flange
  • the flange facing portion 100 c has a flange shape with respect to the straight line Q connecting the web facing portion 100 d and the flange facing portion 100 a.
  • the curved shape is convex in the inner direction.
  • the steeply inclined portion 100b is illustrated as a linear shape, but the steeply inclined portion 100b may be curved.
  • the inclination angles ⁇ f2 and ⁇ f3 of the flange facing portions 100a and 100c are tangents at the center in the height direction of the flange facing portions 100a and 100c with respect to the horizontal line. What is necessary is just to determine with the inclination angle of (Qa, Qc in FIG. 8).
  • the inclination angle may be determined based on the tangent line that maximizes the angle.
  • the straight line Q and the tangent lines Qa and Qc have been described with the lower hole type roll 68, but the upper hole type 65 roll may be determined in the same manner.
  • the hole shape of the hole mold 69 ′ is described as a shape having a plurality of flange facing portions 100a, 100b, 100c having different inclination angles, and details of the portions 100a, 100b, 100c are described.
  • the shapes of the flange corresponding portions 5 and 6 may be configured by a plurality of straight lines or curves, or a combination of both, and the shapes of the portions 100a, 100b, and 100c can be arbitrarily designed according to the shapes. If a curved portion is formed in the flange corresponding portions 5 and 6, the inclination angle of the curved portion may be defined by the angle of the tangent line.
  • the flange-corresponding part has a thickness distribution in which the thickness changes in the direction along the surface of the flange-corresponding part, or a plurality of bends in which the flange-corresponding part has a large inclination angle near the neutral line. It is very effective to apply to a product having a shape having a portion, and is included in the scope of the present invention.
  • the flange-corresponding portion has a thickness distribution in the direction along the surface, it is conceivable to relatively reduce the thickness in the vicinity of the neutral line from the cross-sectional efficiency of the hat-shaped steel sheet pile product.
  • the flange-facing portion 100b has a larger inclination angle than the flange-facing portions 100a and 100c. Therefore, the flange extension at the flange-facing portion 100b is larger than that of the conventional hole shape. It is hard to become, and the effect similar to the said embodiment or more is acquired.
  • the rolling state in the bent shape shown in FIGS. 7 and 8 can be applied to the product shape. Useful for.
  • the boundary portions of the flange facing portions 100 a, 100 b, 100 c may have R.
  • the boundaries of the portions 100a, 100b, and 100c may be intermediate points of the corner R.
  • the flange wave generated in the conventional hole 69 has a peak position of the wave height in the cross section of the flange corresponding portion, and the neutral line of the hole 69 shown in FIG. It became clear that it was included in the range of 10% of the hole mold depth D in the height direction from O. Therefore, when the steeply inclined portion 100b near the neutral line O is a straight line, as shown in FIG. 11, the steeply inclined portion 100b that reduces the flange extension has a hole depth D up and down from the neutral line O in the height direction. It is desirable to include a range of 10%.
  • the hole mold depth D is defined by the vertical height of the entire flange facing portion (100a, 100b, 100c) of the pilot hole roll forming the hole mold, and as shown in FIG.
  • the upper end position of the height D is the upper end in the height direction of the boundary between the flange corresponding portion and the arm corresponding portion
  • the lower end position is the lower end in the height direction of the boundary between the flange corresponding portion and the web corresponding portion.
  • the steeply inclined portion 100b (range P1 to P2 in the figure) It is desirable to include a range of 10% of the hole depth D in the vertical direction from the neutral line O. In these cases, in the line segment corresponding to the steeply inclined portion 100b in the center line S, the above-described effect is more remarkable when the position Fd at which the angle with respect to the horizontal line is maximum coincides with the neutral line O.
  • FIG. 12 shows that in the line segment corresponding to the steeply inclined portion 100b in the center line S, the above-described effect is more remarkable when the position Fd at which the angle with respect to the horizontal line is maximum coincides with the neutral line O.
  • the effect of the present invention can be enjoyed even if the position Fd is deviated from the neutral line O in the height direction. This is also the same reason as that when the flange facing portion 100b is a straight line.
  • the inclination angle at the position of the maximum inclination angle may be ⁇ f1
  • the flange extension may be ⁇ 1. Therefore, these cases are also included in the scope of the present invention as the vicinity of the neutral line.
  • the second flange facing portion and the third flange facing portion are disposed adjacent to the first flange facing portion. However, they are not necessarily adjacent to each other. There is no need to be placed. That is, the second flange facing portion and the third flange facing portion have an inclination angle smaller than that of the first flange facing portion, and are respectively between the first flange facing portion and the web facing portion, and between the first flange facing portion and the arm facing. It can also set between parts according to a product shape.
  • the present invention is applicable to steel sheet piles having variously shaped flanges that may generate flange waves in intermediate rolling. Specifically, it can be applied to a U-shaped steel sheet pile in addition to a hat-shaped steel sheet pile.
  • Example 1 As Example 1 of the present invention, a hole mold corresponding to the improved hole mold 69 ′ described above with reference to FIG. 7 is an intermediate rolling hole mold (the second hole mold and the third hole mold in the above embodiment). And rolled molding of the material to be rolled was performed under conditions 1 to 5 shown in Table 1 below.
  • the hole-facing flange-facing portion is bent into three portions so that the first flange portion straddles the hole-type neutral line shown in Conditions 1 to 5. Here, the angle and length of each flange facing portion were adjusted.
  • the flange-corresponding portion of the material to be rolled after the rolling shaping is flattened by the subsequent hole shape (the fourth hole shape and the fifth hole shape in the above embodiment).
  • a conventional hole shape (hole shape corresponding to the hole shape 69 before improvement) is applied to the intermediate rolling hole shape, and the rolling shaping of the material to be rolled is performed under conditions 6 and 7 shown in Table 1 below. Carried out.
  • FIG. 9 is an explanatory diagram of the present embodiment, and is a schematic cross-sectional view showing the state of the final pass of the rolling shaping with the third hole mold according to the embodiment.
  • condition 6 since rolling shaping was performed without forming the steeply inclined portion in the hole mold, flange stretching ⁇ f1> web stretching ⁇ w, and the formula (6) described in the above embodiment is Since the rolling modeling was not satisfied, the generation of flange waves was confirmed.
  • condition 7 the product was rolled under the condition that the flange thickness of the product was increased to 1.2 mm and the value of ⁇ f1 / ⁇ w was 0.995 so as to satisfy the formula (6). In the same manner as in the above, the rolling shaping was performed without forming the steeply inclined portion in the hole mold, and hence the generation of the flange wave was confirmed.
  • the present invention can be applied to a manufacturing technique of a steel sheet pile having a flange such as a hat-shaped steel sheet pile or a U-shaped steel sheet pile.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
PCT/JP2018/014214 2017-04-03 2018-04-03 フランジを有する鋼矢板の製造方法及び製造設備 WO2018186379A1 (ja)

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EP18781109.6A EP3603832A1 (en) 2017-04-03 2018-04-03 Method and equipment for manufacturing flanged steel sheet piling
JP2018554413A JP6493636B2 (ja) 2017-04-03 2018-04-03 フランジを有する鋼矢板の製造方法及び製造設備
CN201880021446.9A CN110475623A (zh) 2017-04-03 2018-04-03 具有凸缘的钢板桩的制造方法和制造设备
US16/495,033 US20200269294A1 (en) 2017-04-03 2018-04-03 Production method and production facility for steel sheet pile with flanges
PH12019502224A PH12019502224A1 (en) 2017-04-03 2019-09-26 Production method and production facility for steel sheet pile with flanges

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JP7544082B2 (ja) 2022-02-03 2024-09-03 Ｊｆｅスチール株式会社 ハット形鋼矢板の製造方法

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JP6493636B2 (ja) 2019-04-03

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