WO2020032188A1 - ハット形鋼矢板の製造方法 - Google Patents

ハット形鋼矢板の製造方法 Download PDF

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Publication number
WO2020032188A1
WO2020032188A1 PCT/JP2019/031445 JP2019031445W WO2020032188A1 WO 2020032188 A1 WO2020032188 A1 WO 2020032188A1 JP 2019031445 W JP2019031445 W JP 2019031445W WO 2020032188 A1 WO2020032188 A1 WO 2020032188A1
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WIPO (PCT)
Prior art keywords
rolling
die
width
hat
section
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PCT/JP2019/031445
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English (en)
French (fr)
Japanese (ja)
Inventor
浩 山下
片岡　直人
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 EP19846187.3A priority Critical patent/EP3695913A1/en
Priority to CN201980007778.6A priority patent/CN111565860A/zh
Priority to JP2019560783A priority patent/JP6642784B1/ja
Priority to US16/755,077 priority patent/US20210370369A1/en
Publication of WO2020032188A1 publication Critical patent/WO2020032188A1/ja

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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
    • B21B2205/00—Particular shaped rolled products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B21B2261/046—Different thickness in width direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate

Definitions

  • the present invention relates to a manufacturing method for manufacturing a hat-shaped steel sheet pile from a rectangular section material.
  • the manufacture of steel sheet piles having joints at both ends has been performed by a hole rolling method.
  • a hole rolling method it is known that first, a material heated to a predetermined temperature in a heating furnace is sequentially rolled by a rough rolling mill, an intermediate rolling mill, and a finishing rolling mill provided with a groove. ing.
  • steel sheet pile products currently manufactured in Japan can be manufactured from a material having a rectangular cross section.
  • a hat-shaped steel sheet pile product called a 10H product having a second moment of area per 1 m of wall width of 1.0 (10 4 cm 4 / m) or a second moment of area per 1 m of wall width is obtained.
  • a hat-shaped steel sheet pile product of 2.5 (10 4 cm 4 / m) and referred to as a 25H product is manufactured by a conventionally known general hole rolling method.
  • Patent Literature 1 discloses a technique of manufacturing a U-shaped steel sheet pile using a beam blank material for an H-shaped steel.
  • Patent Literature 2 discloses a technique in which a rectangular slab is used as a material, and the material is formed into a more suitable shape (predetermined width and thickness) by a box-hole shape, thereby stabilizing the biting in the next step. Is disclosed.
  • Patent Document 3 discloses a technique in which a rectangular slab is used as a material, and a deformed box hole is used for the material to increase the hole-type restraining force, thereby preventing biting out and improving centering properties. Have been.
  • Patent Document 4 discloses a technique of performing a width reduction such that a local bulge is formed on a slab surface in order to form a projection on a joint of a steel sheet pile in manufacturing a steel sheet pile having a wide effective width.
  • Patent Document 5 discloses a technique for suppressing a shape defect at an end of a material to be rolled in the production of a steel sheet pile.
  • the "large hat-shaped steel sheet pile" in the present specification indicates, for example, a steel sheet pile product having a size exceeding an effective width of 900 mm and an effective height of 300 mm (so-called 25H product).
  • Patent Document 1 is directed to a U-shaped steel sheet pile having no arm portion, and has a configuration in which a thickened portion of a dog bone shape is deformed into a flange portion. There is no mention of lack of metal in the arm part because it is used. Further, the technology described in Patent Document 1 does not adopt the technical idea of manufacturing a steel sheet pile using a material (slab) having a rectangular cross-sectional shape in the first place. There was no room for the problem of insufficient meat.
  • the material to be rolled is shaped so as to match the shape of the upper roll to stabilize biting by a hole shape, but a U-shape having no arm portion is used. Since the technique relates to the manufacture of steel sheet piles, the problem of insufficient wall thickness at the end face of the rectangular cross-section material at the time of biting is not mentioned or even suggested.
  • the hole-shaped contact in the box-shaped hole is made to be a surface contact to increase the binding force, and is aimed at improving the rolling stability such as the centering property.
  • Patent Document 3 there is no mention of a problem that the thickness of the end face of the rectangular cross-section material is insufficient.
  • Patent Document 4 when manufacturing a steel sheet pile having a wide effective width, in order to form a ridge on a joint of the steel sheet pile, a width reduction such as forming a local bulge on the slab surface is performed. Is disclosed. However, the technique of Patent Document 4 is intended to form a ridge, and does not mention or suggest the problem of insufficient thickness of the end face of the rectangular cross-section material as described above. .
  • Patent Literature 5 refers to bulging deformation of a slab in edging rolling. However, it is described that the bulging deformation is a factor that promotes a shape defect at a biting end portion. No mention was made of any problems with the lack of meat in the department and how to resolve them.
  • an object of the present invention is to produce a large hat-shaped steel sheet pile using a material (slab) having a rectangular cross-sectional shape, thereby suppressing a shortage of a wall thickness at an arm portion generated in a rough molding stage, It is an object of the present invention to provide a technique capable of manufacturing a hat-shaped steel sheet pile product having a good shape.
  • a manufacturing method for manufacturing a hat-shaped steel sheet pile by rolling down a rectangular cross-section material, and edging rolling performing rolling-down in the width direction with respect to the rectangular cross-section material,
  • a method for manufacturing a hat-shaped steel sheet pile is provided, in which the width of an end of the material to be rolled is increased in thickness in a dog bone shape by using an edging hole which is a constrained hole having a shape.
  • the range Wa to be increased in the width direction of the rectangular cross-section material may be a range corresponding to part or all of the width Wb of a portion corresponding to the arm of the material to be rolled in the first forming rolling. good.
  • the range Wa to be increased in the width direction of the rectangular cross-section material is defined by a portion where the thickness is larger than the hole bottom width T3 of the edging hole type, and the thickness is increased in the width direction of the rectangular cross-section material.
  • the relationship between the range Wa to be performed and the width Wb of the portion corresponding to the arm of the material to be rolled in the first forming rolling may satisfy Wa ⁇ Wb.
  • FIG. 1 It is a schematic explanatory view of a rolling line concerning an embodiment of the invention. It is a schematic explanatory drawing about the groove
  • FIG. 5 is a schematic explanatory view showing a pressing-down height H and a bending deformation moment arm L of a material in a second die (first forming die).
  • FIG. 4 is a schematic explanatory view showing a state of a material being reduced in a second die (first molded die). It is a partially enlarged view of FIG. It is the graph which digitized the change of the upper surface full width t1 and the full width maximum t2 of the raw material at the time of performing rolling shaping
  • the second die K2 (first forming die) is used. It is the graph which digitized the change of the total width t1 of the upper surface of a raw material, and the full width maximum t2 when rolling molding of a raw material was performed by several passes by FEM analysis. It is explanatory drawing regarding a start.
  • a material having a rectangular cross section is referred to as a material B
  • a material to be rolled having a substantially hat-shaped cross-sectional shape by rolling down the material B is referred to as a material A to be rolled.
  • a material to be rolled A steel materials that pass through the rolling line S with a substantially hat-shaped cross-sectional shape are collectively referred to as a material to be rolled A, and the respective portions of the material to be rolled A are separately named differently as described below. Shall be described.
  • the long side direction of the rectangular cross section is defined as the width direction
  • the short side direction is defined as the thickness direction.
  • the material A to be rolled is a web corresponding portion 3 corresponding to the web of the hat-shaped steel sheet pile product, flange corresponding portions 4 and 5 connected to both ends of the web corresponding portion 3, and flange corresponding portions 4 and 5. It is composed of arm corresponding portions 6 and 7 formed at the respective distal ends, and joint corresponding portions 8 and 9 formed at the distal ends of the arm corresponding portions 6 and 7.
  • FIG. 1 is an explanatory diagram of a rolling line S for manufacturing a hat-shaped steel sheet pile, which is rolling equipment according to an embodiment of the present invention, and a rolling mill provided in the rolling line S.
  • a rolling line S As shown in FIG. 1, in a rolling line S, a rough rolling mill (BD) 11, an intermediate rolling mill (R) 12, and a finishing rolling mill (F) 14 are sequentially arranged.
  • the rolling line S is constituted by a plurality of lines S1 to S3, the line S1 and the line S2 are adjacent, and the line S2 and the line S3 are adjacent.
  • the lines S1 to S3 are connected in series such that a part of the lines S1 to S3 overlaps each other.
  • the material A to be rolled moves from S1 to S2 or from S2 to S3 in parallel in the width direction thereof and the rolling line S is configured to proceed.
  • a rough rolling mill 11 is arranged on a line S1
  • an intermediate rolling mill 12 is arranged on a line S2
  • a finishing mill 14 is arranged on a line S3.
  • Each of the lines S1 to S3 can be rolled with a different material to be rolled A placed thereon, and the rolling of a plurality of materials to be rolled A can be simultaneously performed in parallel on the rolling line S. It has a configuration.
  • a raw material having a rectangular cross-sectional shape (a raw material B and a material to be rolled A later) heated in a heating furnace (not shown) is sequentially rolled in a rough rolling mill 11 to a finishing rolling mill 14 and finally rolled.
  • the product is a hat-shaped steel sheet pile. That is, the final product is manufactured by performing the rough rolling step, the intermediate rolling step, and the finish rolling step on the material B (rolled material A) in this order.
  • a plurality of rolling mills such as a rough rolling mill 11, an intermediate rolling mill 12, and a finishing rolling mill 14 (hereinafter referred to as a rough rolling mill 11 to a finishing rolling mill 14), which are arranged in the rolling line S, may be abbreviated.
  • the rough rolling mill 11, the intermediate rolling mill 12, and the finishing rolling mill 14 are general equipments conventionally used except for the detailed shape and configuration of the groove shape. In the description, attention will be paid to the description of the groove configuration, and description of the detailed equipment configuration and the like of each rolling mill will be omitted.
  • the dies which will be described below with reference to FIGS. 2 to 7 are engraved on each of the rolling mills from the rough rolling mill 11 to the finish rolling mill 14. Which rolling mill is to be engraved can usually be appropriately changed according to conditions such as equipment conditions and product dimensions, in consideration of productivity (efficiency / yield) and workability. Therefore, in the present embodiment, these cavities are referred to as first to sixth cavities K1 to K6, and it is assumed that the respective cavities only need to be engraved in order from the upstream of the rolling line S. .
  • FIGS. 3 to 9 the shapes of the material B and the material A to be rolled down and formed by the respective dies are shown by dashed lines for reference.
  • first to sixth hole types K1 to K6 are not limited to those shown in the drawings. Can be appropriately changed according to conditions such as equipment status and product dimensions.
  • the roll forming of the material to be rolled is performed in one pass for each die type. Due to restrictions on load characteristics, the rolling may be performed in reverse rolling (reversible rolling) in a plurality of passes, and the number of passes may be set arbitrarily according to rolling mill characteristics or the like.
  • FIG. 2 is a schematic explanatory diagram of the groove shape of the first groove K1.
  • the first hole die K1 is a box hole type comprising an upper hole type roll 20a and a lower hole type roll 20b, and the bottom of the box hole type has a predetermined tapered shape.
  • the material B having a rectangular cross-section is used by the first hole die K1.
  • the steel sheet pile is lightly reduced in the width direction (so-called edging rolling) in a state where the steel sheet pile is set in a vertical direction.
  • the light reduction is performed with a reduction amount sufficient to correct a dimensional variation or the like at the time of casting the material B.
  • the reason why the tapered shape is imparted to the width direction end of the material B having the rectangular cross-sectional shape is to allow the material B to be appropriately engaged with the hole shape of the second hole type K2 described later and to stably perform desired reduction. is there. That is, the “tapered shape” here refers to a shape of a hole-shaped bottom surface that can impart a gentle slope shape to the width direction end of the raw material B (not shown) by light pressure.
  • the first die K1 shown in FIG. 2 is a die for performing so-called edging rolling, and this first die K1 is called an “edging die”.
  • FIG. 3 is a schematic explanatory diagram of the groove shape of the second groove K2.
  • the second hole type K2 includes an upper hole type roll 30a as a projection roll and a lower hole type roll 30b as a groove roll.
  • the second hole die K2 reduces the entire material B (subsequent rolled material A) having a rectangular cross-sectional shape that has been edge-rolled in the first hole die K1.
  • the material B is set up under the pressure of the first die K1.
  • the raw B is rotated by 90 ° or 270 °, and the width direction of the raw B in the second die K2 is set to be horizontal.
  • the rolling is performed in a state where the cross section is set in the horizontal direction (a state in which the width direction of the steel sheet pile is set in the horizontal direction), and the rolling molding is performed in which the cross section is changed from a rectangular cross section to a substantially hat-shaped cross section.
  • the second die K2 is also referred to as a “first die” in which the first die rolling is performed.
  • the substantially hat-shaped cross-sectional shape means a portion corresponding to the web in the material B (web corresponding portion 3), a portion corresponding to the flange (flange corresponding portions 4, 5), and a portion corresponding to the arm (arm corresponding portion 6, 7)
  • the upper hole type roll 30a includes a web facing portion 32 facing the upper surface of the web corresponding portion 3 of the material B, flange facing portions 34 and 35 facing the upper surfaces of the flange corresponding portions 4 and 5, and arm corresponding portions 6 and 7. Of the arm are opposed to the upper surface of the arm.
  • the pilot hole type roll 30b includes a web facing portion 42 facing the lower surface of the web corresponding portion 3 of the material B, flange facing portions 44 and 45 facing the lower surfaces of the flange corresponding portions 4 and 5, and an arm corresponding portion 6. , 7 are constituted by arm facing portions 47 and 48 facing the lower surfaces.
  • FIG. 4 is a schematic explanatory diagram of the hole shape of the third hole type K3.
  • the third hole type K3 includes an upper hole type roll 50a as a projection roll and a lower hole type roll 50b as a groove roll.
  • the third hole die K3 further reduction is applied to the material A to be rolled formed in the second hole die K2, a joint shape is roughly formed, and the cross-sectional shape is changed from a substantially hat-shaped cross-sectional shape. Rolling is performed on the entire material A to be rolled so as to have a substantially hat-shaped cross-sectional shape in which a joint portion is formed.
  • the third die K3 is also referred to as a "second die" for performing the second rolling.
  • the upper hole type roll 50a includes a web facing portion 52 facing the upper surface of the web corresponding portion 3 of the material A to be rolled, flange facing portions 54 and 55 facing the upper surfaces of the flange corresponding portions 4 and 5, and an arm corresponding portion 6. , 7 are constituted by arm facing portions 57 and 58 facing the upper surface.
  • the pilot hole type roll 50b includes a web facing portion 62 facing the lower surface of the web corresponding portion 3 of the material A to be rolled, flange facing portions 64 and 65 facing the lower surfaces of the flange corresponding portions 4 and 5, and an arm corresponding portion. It is composed of arm facing portions 67 and 68 facing the lower surfaces of the portions 6 and 7.
  • FIG. 5 is a schematic explanatory view of the hole shape of the fourth hole type K4.
  • the fourth hole type K4 includes an upper hole type roll 70a as a projection roll and a lower hole type roll 70b as a groove roll.
  • the joint shape is further formed by the fourth hole die K4, and the thickness reduction and forming (thickness elongation rolling) are performed on the entire material A to be rolled, so that the shape is closer to the hat-shaped steel sheet pile product. You.
  • FIG. 6 is a schematic explanatory diagram of the groove shape of the fifth groove K5.
  • the fifth hole type K5 includes an upper hole type roll 100a as a projection roll and a lower hole type roll 100b as a groove roll.
  • the sheet thickness is reduced to a value corresponding to the final product, and rolling for determining the substantial product sheet thickness is performed.
  • rolling for determining the joint plate thickness is performed, whereby the final product shape including the joint shapes is almost determined. More specifically, the thickness of the joint shape is determined in the fifth hole die K5, and the joint corresponding portions 8 and 9 are bent in the sixth hole die K6 described later.
  • the thickness reduction of the fifth die K5 is smaller than that of the fourth die K4, which positively reduces the thickness of the material A to be rolled.
  • FIG. 7 is a schematic explanatory view of the groove shape of the sixth groove K6.
  • the sixth hole type K6 is composed of an upper hole type roll 110a as a projection roll and a lower hole type roll 110b as a groove roll.
  • the bending of the corresponding parts 8 and 9 and the shaping of the entire material to be rolled A by light reduction rolling are performed.
  • joint forming is performed in which the entire joint corresponding portions 8 and 9 are bent so as to have the joint shape of the product.
  • the material A to be rolled is formed to the shape of the hat-shaped steel sheet pile product.
  • the groove rolling method of the hat-shaped steel sheet pile includes a rough rolling step, an intermediate rolling step, and a finish rolling step.
  • the rough rolling step and the rough rolling step in the first to fifth hole types K1 to K5 are performed.
  • the intermediate rolling process is sequentially performed, and the finish rolling process is performed in the sixth die K6.
  • all of the hole shapes of the fourth to sixth hole types K4 to K6 have a substantially hat-shaped cross-sectional shape, but are engraved in a shape closer to the product shape toward the subsequent hole shape. That is, the shape of the sixth hole die K6 in which the finish rolling as the final step is performed is a hat-shaped steel sheet pile product shape.
  • the rolling line S is provided with a rough rolling mill (BD) 11, an intermediate rolling mill (R) 12, and a finishing rolling mill (F) 14, which are arranged in this order.
  • the one-hole type K1 to the sixth-hole type K6 are dispersed and engraved in each rolling mill in an arbitrary configuration.
  • the first to third die K1 to K3 are engraved on the rough rolling mill 11
  • the fourth die K4 and the fifth die K5 are engraved on the intermediate rolling mill 12, and the finishing mill 14 is formed.
  • a sixth hole type K6 is engraved.
  • the hole type configuration in the present invention is not limited to such a configuration.
  • the hat-shaped steel sheet pile product conventionally manufactured was a product having a size less than a so-called 25H product, for example, an effective width of 900 mm ⁇ effective height of 300 mm.
  • the present inventors intend to manufacture a product having a size exceeding 900 mm in effective width ⁇ 300 mm in effective height as a large hat-shaped steel sheet pile product.
  • the problems described below are extremely significant and are important as problems to be solved.
  • the rolling height in the second die K2 increases. That is, in the rolling shaping with the second die K2 (first forming die), the press-down height H with respect to the material B is increased, and the amount of bending deformation of the material B is increased.
  • the moment arm L of the bending deformation in the rolling molding in the second die K2 is increased. For this reason, the deformation at the time of the rolling molding is such that the bending deformation is dominant over the shear deformation.
  • FIG. 8 is a schematic explanatory view showing a pressing height H and a bending deformation moment arm L with respect to the material B in the second die K2 (the first die).
  • the press-down height H shown in FIG. 8 indicates the amount of reduction in the rolling molding in which the shape of the material B is substantially hat-shaped in the second cavity K2 (first molding cavity).
  • the pushing-down height H tends to increase.
  • the bending deformation moment arm L shown in FIG. 8 is a flange when the cross section of the material B is formed from a rectangular cross section to a substantially hat-shaped cross section in the second die K2 (first forming die). This is a moment arm when bending deformation is performed to form a considerable portion, and the bending deformation moment arm L tends to increase as the width of the final hat-shaped steel sheet pile product increases.
  • FIG. 9 is a schematic explanatory view showing the state of reduction of the material B in the second die K2 (first molding die), and shows the state of reduction in steps (a) to (c). . Further, the cross section of the material B is shown by a dashed line, and a partially enlarged view thereof (broken line portion in FIG. 9) is shown in FIGS. 10 (a) to 10 (c).
  • the rolling shaping in the second die K2 (first forming die) can be mainly shown in three stages. As shown in FIGS. 9 (a) and 9 (b), in the first stage, molding is performed in a state where only the peripheral surface of the maximum diameter of the upper hole type roll 30a is in contact. This is a stage before the thickness reduction of the portion B1 corresponding to. In the first stage, there is no thickness reduction of the material B, that is, only the forming of bending the material B is performed.
  • the thickness reduction of the portion B1 corresponding to the flange of the material is started, and then the portion B2 corresponding to the arm of the material and the material B2 Up to the stage before the thickness reduction of the portion B3 corresponding to the web starts.
  • the thickness reduction of only the portion B1 corresponding to the flange of the material is started.
  • the third stage is a stage in which the thickness of the entire material B (B1 to B3) is reduced (the entire surface is reduced) after the completion of the second stage.
  • the molding is performed in a state where the entire material B is unconstrained, and the upper surface near the central portion thereof is pressed downward by the upper hole type roll 30a, so that the upper surface corresponds to the arm of the material.
  • a drawing phenomenon occurs from the portion B2 toward the portion B1 corresponding to the flange and the portion B3 corresponding to the web.
  • the amount of meat in the portion B2 corresponding to the arm of the material decreases, and an event such as an insufficient amount of meat in the portion B2 is observed.
  • voids 121 and 122 are formed near both ends of the second die K2 (the first die). It is known that such voids 121 and 122 remain even in the third stage shown in FIG. 9C and adversely affect the subsequent rolling molding.
  • FIG. 11 (a) is an FEM analysis of the change in the total width t1 of the upper surface of the material B and the maximum width t2 of the material B when the rolling molding of the material B in the second die K2 (first forming die) is performed in plural passes. It is a graph quantified by.
  • FIG. 11B is an explanatory diagram of “the entire upper surface width”, “the maximum overall width”, and “the web gap”.
  • the graph shown in FIG. 11A uses a slab material having a cross-sectional dimension of 1930 mm ⁇ 300 mm, and has a second die K2 (first die) using a pass schedule shown in Table 1 below. This is a case in which the rolling molding of is performed.
  • Table 1 Table 1
  • the “upper surface full width t1” of the material B at the time of the rolling molding is a value of the total width determined in contact with the upper hole type roll 30a
  • the “full width maximum t2” is It is defined as the value of the total width determined in contact with the pilot hole type roll 30b.
  • the ideal deformation state is that there is no difference between the numerical values of the upper surface full width t1 and the total width maximum t2, and that they always match.
  • the entire upper surface width t1 fluctuates greatly with the progress of the rolling shaping pass in the second shank K2 (first shaping shank).
  • the thickness is insufficient in a range of about 50 mm from the end. This is because, as described above with reference to FIGS. 9 and 10, the thickness of the portion B ⁇ b> 2 corresponding to the arm decreases due to the rolling molding (forming), and the thickness becomes insufficient.
  • the variation width is particularly large in the passes (first to fourth passes) until the thickness reduction of the portion B1 corresponding to the flange is started. This is because in the first to fourth passes, there is no reduction in the thickness of the material B, and this is a stage in which bending deformation is occurring in addition to shear deformation.
  • the width of the portion B2 corresponding to the material arm expands due to the reduction in thickness, and the total upper surface width t1 starts to increase. The shortage is not completely eliminated, and the rolling shaping with the second die K2 (the first die) is completed.
  • the portion B2 corresponding to the arm is formed by rolling molding in the second die K2 (the first die).
  • a shortage of meat occurs, and as a result, a product shape defect may occur due to a shortage of meat in the product arm.
  • the present inventors have conducted intensive studies, and using a rectangular cross-section material (slab) wider than the die width of the second die K2 (the first die), the second die K2 (the first die).
  • a rectangular cross-section material (slab) wider than the die width of the second die K2 (the first die), the second die K2 (the first die).
  • the dog bone-shaped material B after the edging roll forming is subjected to the second molding. It has been found that the rolling molding in the die K2 (first forming die) can eliminate the insufficient thickness of the portion B2 corresponding to the arm.
  • dog bone shape refers to a state in which the thickness of both side edges in the width direction is deformed to be thicker than the center in the width direction as compared with the rectangular cross section, and is a so-called double bulging deformed rectangle. Refers to a cross-sectional material.
  • FIG. 12 shows that in the edging mold, edging rolling is performed on the material B wider than the second mold K2 (first forming mold) to increase the thickness of the width direction ends (upper and lower ends in the figure).
  • FIG. 12A shows a cross section of a so-called double bulging-deformed dog-bone-shaped material to be rolled (raw material B)
  • FIG. 12B is an enlarged view of a partial cross section thereof. More specifically, as shown in the figure, for a material B having a slab thickness T1 and a width larger than the width of the second die K2 (first die), the width of the die bottom (the die width).
  • a restricted hole type in which T3 is larger than the slab thickness T1 (that is, T1 ⁇ T3) is used as an edging hole type. Then, in this edging die, a portion corresponding to the arm in the second die K2 (the first die) is subjected to edging rolling so that the maximum thickness of the end in the width direction of the material B becomes T2. Insufficient meat amount of B2 can be suppressed.
  • the maximum thickness T2 of the raw material B after the edging rolling is a value larger than both the slab thickness T1 and the hole bottom width T3 (T1 ⁇ T3 ⁇ T2).
  • the second die K2 (the first die) is formed by edging rolling. From the viewpoint of suppressing the shortage of the thickness of the portion B2 corresponding to the arm, while preventing the metal from protruding from the hole (so-called "biting") due to the excessive thickness, the range Wa is set to the second hole. It is preferable to set a range corresponding to part or all of the width Wb (shown in FIG. 13) of the portion B2 corresponding to the arm of the material in the mold K2 (first forming hole mold). That is, it is preferable to satisfy the relationship of Wa ⁇ Wb.
  • each corner portion having a predetermined curvature on the peripheral surface of the hole shape of the first hole shape K1 or the second hole shape K2.
  • the dimensions may be measured and defined based on the intersections when virtual lines are drawn on both sides of the corner. For example, as shown in FIG. 12 (b), when defining the groove bottom width T3 of the edging hole type or measuring the range Wa to be thickened, the extended imaginary line of the side surface and the bottom surface of the edging hole type. The point P1 at the intersection of may be used as a reference.
  • T2 and T1 have a predetermined relationship. It is desirable that the preferable relationship between T2 and T1 is appropriately determined based on a change in the total width t1 of the upper surface of the material B described later with reference to FIG.
  • FIG. 13 is a cross-sectional view of a conventional rectangular cross section and a cross section at the time of rolling shaping with the second die K2 (first forming die) in the case where the end portion in the width direction of the material is thickened at the time of edging rolling according to the present invention.
  • FIG. 13 is a cross section when the thickness reduction of the portion B1 corresponding to the flange of the material starts, and (a) and (b) show the same roll gap, for convenience of explanation. , Only a part of the cross section is enlarged.
  • FIG. 14 is a schematic diagram comparing the cross-sectional shape of the material to be rolled at the time of completion of the rolling shaping in the second die K2 (the first die), in which the hatched portion is the cross-section at the time of applying the present invention and is surrounded by a broken line.
  • the solid line shown at the location indicates a portion where the wall thickness is insufficient in the conventional cross section, and in particular, the vicinity of the portion B2 corresponding to the arm of the material to be rolled is enlarged and illustrated.
  • rolling shaping with the second die K2 first forming die
  • FIG. 15 shows that the slab wider than the width of the second die K2 (first forming die) is subjected to edging rolling to increase the thickness of the end in the material width direction, and then the second die K2 ( It is the graph which digitized the change of the upper surface full width t1 of the raw material B, and the full width maximum t2 when rolling molding of the raw material B in a 1st shaping
  • the slab that is, a material of 2030 mm ⁇ 300 mm
  • the second die K2 Edging rolling is performed on a slab (that is, a 1980 mm ⁇ 300 mm material) having a width 50 mm wider than the width of the second die K2 (the first die), in the case of performing rolling molding with the first die.
  • 11 is a graph showing a case where rolling shaping is performed with a second die K2 (first forming die) after performing the above, and for reference, a graph in the case where the present invention is not applied (conventional method) (similar to the graph in FIG. 11). ) Are also shown.
  • the pass schedule of the rolling molding is the pass schedule described in Table 1 above.
  • the portion corresponding to the arm is thickened by bulging by edging rolling, and then rolling shaping is performed by the second die K2 (the first die). Since the thickness of the portion corresponding to the arm is increased, the former pass (for example, the first pass to the fifth pass) is deformed to promote the drawing of the metal toward the flange side, as described above with reference to FIG. In addition, it can be seen that the rise (recovery) of the entire upper surface width t1 in the subsequent pass (for example, the sixth pass and thereafter) is remarkable because the start of the rolling down of the portion corresponding to the arm is accelerated.
  • FIG. 15 shows a schedule for performing rolling molding in all 16 passes (see Table 1), and the ideal deformation state in the final pass (the 16th pass) is that the upper surface full width t1 and the full width maximum t2 are the same. It is a deformation that matches (see the hatched portion in FIG. 14). If the slab width is too large and the amount of reduction during edging rolling is excessive, as shown in FIG. (See the broken line in FIG. 16). Under the condition using a slab having a width 100 mm wider than the width of the second die K2 (first die) shown in FIG. 15, since the maximum total width t2 ⁇ the total upper surface width t1 in the final pass, the wall thickness is small. Too much.
  • the appropriate slab dimensional condition for realizing the ideal deformed state is that the width is more than 50 mm and less than 100 mm wider than the width of the second die K2 (the first die).
  • the width of the second die K2 (the first die) may be calculated based on the product dimensions (particularly, the product width) of the final hat-shaped steel sheet pile product. The width may be determined by adding the bent portion.
  • the slab wider than the width of the second die K2 (the first die) is subjected to edging rolling to increase the thickness of the end in the material width direction.
  • a method such as rolling and shaping the material B in the second die K2 (first forming die) after the application, when manufacturing a large hat-shaped steel sheet pile product, the second die K2 (first forming die) is manufactured.
  • the problem that the thickness of the portion B2 corresponding to the arm is insufficient in the rolling molding in the forming die (molding die), and as a result, the product shape defect due to the insufficient thickness in the product arm is solved. That is, a hat-shaped steel sheet pile product having a good shape can be stably manufactured.
  • the range Wa to be increased is determined by the portion B2 corresponding to the arm of the material in the second die K2 (first forming die). Is preferably smaller than the width Wb. It has been found that by satisfying the relationship of Wa ⁇ Wb, the shortage of meat in the product arm can be sufficiently solved.
  • the first to third dies K1 to K3 are formed in the rough rolling mill 11, and the fourth dies are formed in the intermediate rolling mill 12.
  • the configuration in which the K4 and the fifth die K5 are engraved and the sixth die K6 is engraved on the finishing mill 14 the engraving of the die in each rolling mill in the present invention is optional. Can be determined.
  • the present invention is applicable to a manufacturing method for manufacturing a hat-shaped steel sheet pile from a material having a rectangular cross section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
PCT/JP2019/031445 2018-08-08 2019-08-08 ハット形鋼矢板の製造方法 WO2020032188A1 (ja)

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EP19846187.3A EP3695913A1 (en) 2018-08-08 2019-08-08 Method for manufacturing hat-shaped steel piling
CN201980007778.6A CN111565860A (zh) 2018-08-08 2019-08-08 帽型钢板桩的制造方法
JP2019560783A JP6642784B1 (ja) 2018-08-08 2019-08-08 ハット形鋼矢板の製造方法
US16/755,077 US20210370369A1 (en) 2018-08-08 2019-08-08 Method for producing hat-shaped steel sheet pile

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US11958092B2 (en) * 2020-03-10 2024-04-16 Nippon Steel Corporation Production method for hat-shaped steel sheet pile
CN112474794B (zh) * 2020-11-25 2022-07-29 马鞍山钢铁股份有限公司 一种帽型钢轧制方法及帽型钢

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JPS5865501A (ja) * 1981-10-16 1983-04-19 Kawasaki Steel Corp Ｕ形鋼矢板用粗形鋼片の圧延方法
JPH0234201A (ja) * 1988-07-25 1990-02-05 Nippon Steel Corp 非対称異形ボックス孔型による形鋼の圧延方法
JPH05329502A (ja) * 1992-05-29 1993-12-14 Nippon Steel Corp 連続壁用形鋼の圧延方法
JPH07178402A (ja) * 1993-12-24 1995-07-18 Nkk Corp 鋼製連壁用形鋼の製造方法
JPH09182901A (ja) 1995-12-28 1997-07-15 Kawasaki Steel Corp Ｕ形鋼矢板の成形方法
JPH10113707A (ja) 1996-10-14 1998-05-06 Sumitomo Metal Ind Ltd ボックス孔型ロールと形鋼の圧延方法
JPH10192905A (ja) 1996-12-27 1998-07-28 Kawasaki Steel Corp Ｕ形鋼矢板の製造方法
JP2005144497A (ja) 2003-11-14 2005-06-09 Jfe Steel Kk 継手に突条を有する鋼矢板の製造に用いる粗圧延ロールおよび粗圧延方法
WO2018139521A1 (ja) 2017-01-27 2018-08-02 新日鐵住金株式会社 鋼矢板の製造方法

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Publication number Priority date Publication date Assignee Title
JPS5865501A (ja) * 1981-10-16 1983-04-19 Kawasaki Steel Corp Ｕ形鋼矢板用粗形鋼片の圧延方法
JPH0234201A (ja) * 1988-07-25 1990-02-05 Nippon Steel Corp 非対称異形ボックス孔型による形鋼の圧延方法
JPH05329502A (ja) * 1992-05-29 1993-12-14 Nippon Steel Corp 連続壁用形鋼の圧延方法
JPH07178402A (ja) * 1993-12-24 1995-07-18 Nkk Corp 鋼製連壁用形鋼の製造方法
JPH09182901A (ja) 1995-12-28 1997-07-15 Kawasaki Steel Corp Ｕ形鋼矢板の成形方法
JPH10113707A (ja) 1996-10-14 1998-05-06 Sumitomo Metal Ind Ltd ボックス孔型ロールと形鋼の圧延方法
JPH10192905A (ja) 1996-12-27 1998-07-28 Kawasaki Steel Corp Ｕ形鋼矢板の製造方法
JP2005144497A (ja) 2003-11-14 2005-06-09 Jfe Steel Kk 継手に突条を有する鋼矢板の製造に用いる粗圧延ロールおよび粗圧延方法
WO2018139521A1 (ja) 2017-01-27 2018-08-02 新日鐵住金株式会社 鋼矢板の製造方法

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