EP3778050B1 - Procédé et dispositif pour cintrer le flanc d'une plaque d'acier, et procédé et équipement de fabrication de tuyau en acier - Google Patents

Procédé et dispositif pour cintrer le flanc d'une plaque d'acier, et procédé et équipement de fabrication de tuyau en acier Download PDF

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Publication number
EP3778050B1
EP3778050B1 EP19777128.0A EP19777128A EP3778050B1 EP 3778050 B1 EP3778050 B1 EP 3778050B1 EP 19777128 A EP19777128 A EP 19777128A EP 3778050 B1 EP3778050 B1 EP 3778050B1
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EP
European Patent Office
Prior art keywords
steel plate
edge bending
edge
flat part
bending
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP19777128.0A
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German (de)
English (en)
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EP3778050A4 (fr
EP3778050A1 (fr
Inventor
Masayuki Horie
Toshihiro Miwa
Tetsuya Tokuhara
Hidenori Hiraki
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JFE Steel Corp
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JFE Steel Corp
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Filing date
Publication date
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Publication of EP3778050A1 publication Critical patent/EP3778050A1/fr
Publication of EP3778050A4 publication Critical patent/EP3778050A4/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B21D5/015—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments for making tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0826—Preparing the edges of the metal sheet with the aim of having some effect on the weld
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/08—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers
    • B21D43/09—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers by one or more pairs of rollers for feeding sheet or strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor

Definitions

  • the present invention relates to an edge bending method and apparatus of a steel plate for subjecting widthwise edges of the steel plate to edge bending several times separately in a longitudinal direction of the steel plate. Furthermore, the present invention relates to a method and a facility for manufacturing a steel pipe by forming a steel plate subjected to edge bending into a cylindrical shape, butting the widthwise edges to each other, and joining the butted widthwise edges of the steel plate by welding.
  • a steel plate having a predetermined length, width, and thickness is formed by press working into a cylindrical shape having a pipe axis direction in the longitudinal direction of the steel plate, and then the widthwise edges thereof are butt-joined to each other.
  • edge bending (crimping) that imparts a predetermined curvature to the widthwise edges of the steel plate is performed prior to the formation into a cylindrical shape.
  • Such an edge bending is performed in the following manner: a steel plate is arranged between a lower die and an upper die that has a curvature depending on a pipe diameter, and the lower die is lifted by a hydraulic cylinder such that the widthwise edges of the steel plate are pressed against the upper die.
  • the steel plate is longer than the effective length of the dies, the steel plate cannot be pressed across the entire length in a single pressing. Therefore, there has been adopted a method in which edge bending is performed several times (e.g., three to four times) on the widthwise edges of the steel plate while intermittently feeding the steel plate in the longitudinal direction to perform edge bending across the entire length.
  • Patent Literatures 1 to 3 disclose a method for obtaining a preferable shape at a butted portion.
  • Patent Literature 1 specifies a feed length b depending on the thickness or strength of a steel plate.
  • Patent Literature 2 specifies a length Lc of a region to be bent depending on the thickness or strength of a steel plate.
  • Patent Literature 3 specifies a radius of curvature R1 of an upper die, a horizontal distance u relative to the center of the curvature of the upper die to an end of a steel plate, and a pressing force w depending on the thickness or strength of the steel plate.
  • Patent Literature 4 proposes a method of manufacturing a steel pipe in which the variation in shape of a butted portion is small on the basis of the information of the strength of a steel plate.
  • Patent Literature 5 proposes a method for performing edge bending continuously.
  • Patent Literature 6 discloses a method including a U-ing press process for bending a steel plate over the whole length at the same time in manufacture of a steel pipe, in which a transition part that is tapered toward the end of the contact face with the steel plate is formed on the both pipe axis direction end portions of the lower rocker shoe of the rocker die in contact with the outer side surface of the steel plate, in order to prevent from locally contacting a portion causing opening deformation at the longitudinal end portion.
  • Patent Literatures 1 to 4 are, however, all aimed at optimization of the shape at a certain cross section of a steel plate and do not take into consideration variation in the edge bending shape of the steel plate in the longitudinal direction.
  • the edge bending shape is sometimes not uniform in the longitudinal direction of the steel plate, resulting in defective welding at a butted portion or a defective shape of a butted portion of a steel pipe product.
  • Patent Literature 6 relates to a method for preventing the opening deformation and does not take into consideration the case of subjecting a part of the steel plate in the longitudinal direction to bending several times while intermittently feeding the steel plate along the longitudinal direction.
  • a first aspect is an edge bending method of a steel plate using an edge bending apparatus of a steel plate including: a pair of dies configured to be arranged corresponding to a widthwise edge of a steel plate; an actuator configured to clamp the pair of dies with a predetermined pressing force; and a conveyance mechanism configured to convey the steel plate in a direction along a longitudinal direction of the steel plate as a conveyance direction, in which the widthwise edge of the steel plate is subjected to edge bending across an entire length by performing edge bending of the widthwise edge of the steel plate several times by the pair of dies while the steel plate is intermittently conveyed by the conveyance mechanism, and one of the pair of dies that contacts a surface positioned at the outer side of edge bending of the widthwise edge of the steel plate to be bent has a flat part that contacts the surface positioned at the outer side of edge
  • a second aspect is the edge bending method of a steel plate according to the first aspect, in which the die that contacts the surface positioned at the outer side of edge bending includes a transition part formed of a curved surface and provided adjacent to the flat part at least on a delivery side in the conveyance direction, and the flat part and the transition part are connected to have a common tangent line.
  • a third aspect is the edge bending method of a steel plate according to the first or second aspect, in which a leading end portion of the steel plate in the conveyance direction is at a position corresponding to a front end of the flat part in the first pass of edge bending the widthwise edge of the steel plate.
  • a fourth aspect is the edge bending method of a steel plate according to any one of the first to third aspects, in which a trailing end portion of the steel plate in the conveyance direction is at a position corresponding to a rear end of the flat part in the final pass for bending the widthwise edge of the steel plate.
  • a fifth aspect is a method for manufacturing steel pipe including: an edge bending process of a steel plate using an edge bending apparatus of a steel plate provided with a pair of dies configured to be arranged corresponding to a widthwise edge of a steel plate, an actuator configured to clamp the pair of dies with a predetermined pressing force, and a conveyance mechanism configured to convey the steel plate in a direction along with a longitudinal direction of the steel plate as a conveyance direction, in which the widthwise edge of the steel plate is subjected to edge bending across an entire length by performing edge bending of the widthwise edge of the steel plate several times by the pair of dies while the steel plate is intermittently conveyed by the conveyance mechanism; a cylinder-forming process in which the steel plate with the widthwise edges subjected to edge bending is formed into a cylindrical shape and the widthwise edges of the steel plate are butted with each other; and a joining process in which the butted widthwise edges of the steel plate are welded, and one of the pair of dies that contacts a surface
  • a sixth aspect is an edge bending apparatus of a steel plate including: a pair of dies configured to be arranged corresponding to a widthwise edge of a steel plate; an actuator configured to clamp the pair of dies with a predetermined pressing force; and a conveyance mechanism configured to convey the steel plate in a direction along a longitudinal direction of the steel plate as a conveyance direction, in which the widthwise edge of the steel plate is subjected to edge bending across an entire length by performing edge bending of the widthwise edge of the steel plate several times by the pair of dies while the steel plate is intermittently conveyed by the conveyance mechanism, and one of the pair of dies that contacts a surface positioned at the outer side of edge bending of the widthwise edge of the steel plate to be bent includes a flat part that contacts the surface positioned at the outer side of edge bending, wherein the flat part indicates a portion that is extended linearly along the conveyance direction, and a center of the flat part in the conveyance direction is at a position displaced to a delivery side in the conveyanc
  • a seventh aspect is the edge bending apparatus of a steel plate according to the sixth aspect, in which the die that contacts the surface positioned at the outer side of edge bending includes a transition part formed of a curved surface provided adjacent to the flat part at least on a delivery side in the conveyance direction, and the flat part and the transition part are connected to have a common tangent line.
  • An eight aspect is a facility for manufacturing a steel pipe including: an edge bending apparatus of a steel plate provided with a pair of dies configured to be arranged corresponding to a widthwise edge of a steel plate, an actuator configured to clamp the pair of dies with a predetermined pressing force, and a conveyance mechanism configured to convey the steel plate in a direction along a longitudinal direction of the steel plate as a conveyance direction, in which the widthwise edge of the steel plate is subjected to edge bending across an entire length by performing edge bending of the widthwise edge of the steel plate several times by the pair of dies while the steel plate is intermittently conveyed by the conveyance mechanism; a cylinder-forming apparatus configured to form the steel plate with the widthwise edges subjected to edge bending into a cylindrical shape and butt the widthwise edges of the steel plate with each other; and a joining apparatus configured to weld the butted widthwise edges of the steel plate, and one of the pair of dies that contacts a surface positioned at the outer side of edge bending of the width
  • a ninth aspect is the facility for manufacturing a steel pipe according to the eight aspect, in which the die that contacts the surface positioned at the outer side of edge bending includes a transition part formed of a curved surface provided adjacent to the flat part at least on a delivery side in the conveyance direction, and the flat part and the transition part are connected to have a common tangent line.
  • one of a pair of dies that contacts a surface positioned at the outer side of edge bending of a widthwise edge of a steel plate to be bent includes a flat part that contacts the surface positioned at the outer side of edge bending, and edge bending is performed on the widthwise edge of the steel plate with a center of the flat part in the conveyance direction being displaced to a delivery side in the conveyance direction relative to a center of the pressing force in the conveyance direction generated by the actuator, whereby a center of bending deformation force moves closer to the center of the pressing force.
  • front or front side indicates a “delivery side” or a “direction from entry side to delivery side” in a conveyance direction of a steel plate in an edge bending apparatus described below
  • rear or “rear side” indicates the opposite direction.
  • FIG. 1 schematically illustrates a method and a facility for manufacturing a steel pipe according to an embodiment of the present invention for manufacturing a steel pipe from a steel plate which is cut into a predetermined dimension.
  • a steel plate S cut into a predetermined dimension is subjected to beveling working on a side surface thereof by an edge miller 10 or an edge planer.
  • tab plates St are welded to a leading end portion (longitudinal front side end portion) Sa and a trailing end portion (longitudinal rear side end portion) Sb of a steel plate S.
  • the tab plates St may not be provided.
  • edge bending is performed by an edge bending apparatus (crimping) 20 according to an embodiment of the present invention (edge bending process), and a cylindrical shape is formed by a cylinder-forming apparatus 30 (cylinder-forming process).
  • the cylinder-forming apparatus 30 is not limited to those including a U-ing press 30A that first forms the steel plate S subjected to the edge bending into a U shape, and an O-ing press 30B that then forms the steel plate S into an O shape (cylindrical shape).
  • the cylinder-forming apparatus 30 may be a bending press 30C including a feed mechanism that feeds the steel plate S in the width direction and gradually forms the steel plate S into a cylindrical shape as a final shape by sequentially feeding the steel plate S in the width direction and performing three-point bending.
  • the widthwise edges of the steel plate S which are butted with each other as a result of the cylindrical formation, are temporarily welded from the outer surface and then welded by submerged arc welding or the like from the inner surface and the outer surface by a joining apparatus 40 (joining process).
  • the diameter of the steel pipe S' is expanded by a mechanical expander 50 to remove the residual stress, and the steel pipe S' is finished so as to have a predetermined outer diameter and dimension (pipe expansion process). It is noted that other processing such as cleaning, various inspection and bead grinding may be performed in each process or between the processes.
  • FIG. 2 illustrates an example of the steel plate S prior to the edge bending.
  • the width of the steel plate S has a wide range, e.g., from 1200 mm to 5100 mm, depending on the outer diameter of a steel pipe product.
  • a steel plate often has a length of about 12 m, which is a standard length of a line pipe.
  • Tab plates St are welded to each widthwise edge of a leading end portion Sa and a trailing end portion Sb of the steel plate S, which becomes a steel pipe body, in the longitudinal direction. However, the tab plates St may be absent.
  • FIG. 3 illustrates a schematic configuration of the edge bending apparatus 20 of a steel plate.
  • the edge bending apparatus 20 of a steel plate includes a conveyance mechanism 21 that conveys the steel plate S in a direction along with the longitudinal direction thereof as a conveyance direction 1, a press mechanism 22A that bends a widthwise edge Sc, which is on a left side when a delivery side 3 in the conveyance direction is the front side, into a predetermined curvature, a press mechanism 22B that bends a widthwise edge Sd on a right side into a predetermined curvature, and a space adjustment mechanism, which is not illustrated, that adjusts a space between the right and left press mechanisms 22A and 22B depending on the width of the steel plate S on which the edge bending is performed.
  • the conveyance mechanism 21 includes a plurality of conveyance rolls 21a, which are arranged before and after the press mechanisms 22A and 22B.
  • the roll shafts of the conveyance rolls 21a are arranged in a direction perpendicular to the conveyance direction of the steel plate S and are configured to be rotated at a synchronized velocity by a motor and a transmission mechanism, which are not illustrated.
  • FIG. 4 illustrates a widthwise cross section of the press mechanism 22A that bends the left widthwise edge Sc of the steel plate S when viewed in a direction from an entry side 2 to a delivery side 3 of the conveyance direction 1 of the steel plate S.
  • the press mechanism 22A and the press mechanism 22B are bilaterally symmetric and have the same configuration, and accordingly, a detailed illustration of the press mechanism 22B is omitted.
  • the press mechanism 22A and 22B include an upper die 23 and a lower die 24, which are a pair of dies arranged opposite to each other in a vertical direction, a hydraulic cylinder 26, which is an actuator that lifts the lower die 24 together with a tool holder 25 and performs clamping with a predetermined pressing force, and a holding mechanism 27 that releasably holds the steel plate S at each widthwise inner side of the upper die 23 and the lower die 24.
  • the length of the lower die 24 and the upper die 23 in the longitudinal direction of the steel plate S is shorter than the length of the steel plate S. It is configured such that edge bending is performed several times with the steel plate S being moved (intermittently fed) in the longitudinal direction by the conveyance mechanism 21 to provide edge bending on the widthwise edges Sc and Sd of the steel plate S across the entire length.
  • FIG. 5 is a cross-sectional view in the width direction at the same position as in FIG. 4 illustrating a state in which the lower die 24 is clamped by being lifted by the hydraulic cylinder 26.
  • the hydraulic cylinder 26 When the hydraulic cylinder 26 is advanced from a state before the edge bending indicated by the dotted line, the lower die 24 is lifted and brought into the position of the solid line.
  • the widthwise edges Sc and Sd of the steel plate S are bent into a shape following the arc-shaped pressing face of the upper die 23.
  • the width on which the edge bending is performed varies with the width of the steel plate S and is generally about 100 mm to 400 mm.
  • an example is given of the case where the holding mechanism 27 for holding the steel plate S during the edge bending is performed, but is not limited to the presence or absence of the holding mechanism 27.
  • FIG. 6 is a cross-sectional view along with the conveyance direction 1 illustrating a state in which the widthwise edges Sc and Sd of the steel plate S are subjected to edge bending.
  • the steel plate S is carried in from the left side of the drawing and carried out to the right side.
  • the lower die 24 includes a flat part 24a that mainly provides the edge bending.
  • the flat part 24a indicates a portion that is extended linearly along the conveyance direction 1 and is planar in the cross section along with the conveyance direction, but does not mean that it is planar in a widthwise cross section.
  • the shape of the flat part 24a in the widthwise cross section is not particularly limited, and may be an arc shape or may be a straight shape that is inclined to face inward in the width direction.
  • the effective length of the lower die 24, i.e., the length of the flat part 24a is set to be larger than the width that is subjected to the edge bending.
  • the flat part 24a has, for example, a length of 3 m to 5 m, which is a size about 10 times greater than the width that is subjected to the edge bending.
  • a plurality of hydraulic cylinders 26 for lifting the lower die 24 is arranged along the conveyance direction.
  • a combination of a piston-type hydraulic cylinder 26 that generates a thrust force in two directions: upward and downward and a ram-type hydraulic cylinder 26 that generates a thrust force only during upward movement is used.
  • the piston-type hydraulic cylinder 26 is arranged in a middle in the conveyance direction 1 and the ram-type hydraulic cylinders 26 are arranged before and after the piston-type hydraulic cylinder 26.
  • the flat part 24a of the lower die 24 is designed such that a center C1 in the conveyance direction 1 of flat part 24a the matches a center C2 of the pressing force P by the hydraulic cylinders 26.
  • FIG. 6(a) illustrates a state in which the widthwise edges Sc and Sd of the steel plate S are bent by the press mechanisms 22A and 22B and then the steel plate S is conveyed a predetermined conveyance distance by the conveyance mechanism 21.
  • This conveyance distance is set to be smaller than the length of the flat part 24a of the lower die 24.
  • a rear end of the portion subjected to edge bending is positioned on the flat part 24a of the lower die 24, and a transition between the already formed portion and a non-formed portion is unfailingly bent at the next edge bending.
  • the steel plate S is arranged such that a rear end portion of the portion already subjected to edge bending is positioned on the flat part 24a as indicated by the dotted line in FIG.
  • FIG. 7 illustrates results obtained when the edge bending is performed with respect to a range of 170 mm at the widthwise edges of the steel plate S having a plate width of 2755 mm ⁇ a plate thickness of 28.9 mm and the shape is examined.
  • the flat part 24a of the lower die 24 has a length of 3 m, and the edge bending angle is measured when the first edge bending is performed with respect to the leading end portion of 2.8 m from the leading end of the steel plate.
  • the steel plate is then conveyed 2 m, and the edge bending angle is again measured when the second edge bending is performed.
  • the edge bending angle is determined from a difference between an inclination angle in a range of 20 mm at the widthwise edge and an inclination angle of a widthwise middle portion measured by an inclinometer.
  • the edge bending angle in the first edge bending is plotted as ⁇ and the bending angle in the second edge bending is plotted as ⁇ .
  • the range that of the flat part 24a of the lower die in the first edge bending is indicated as Ra1
  • the range of the flat part 24a of the lower die in the second edge bending is indicated as Ra2.
  • the edge bending angle is large (Da) at the leading end portion Sa of the steel plate S, and bending also occurs at a portion that does not contact the flat part 24a on the entry side 2 for a length of about 0.6 m.
  • the edge bending angle becomes larger (Dc) toward the delivery side 3.
  • the edge bending angle is slightly large in the vicinity of the end of the flat part 24a.
  • bending also occurs at the portion that does not contact the flat part 24a for a length of about 0.6 m.
  • the amount of lifting of the lower die 24 is larger by 2 mm on the delivery side 3. It is presumed that an inclination of 0.04 degrees is generated during the edge bending such that the leading end portion side is inclined upward (rotation in pitching direction).
  • FIG. 8(a) schematically illustrates the deformation of the steel plate S and distribution of the bending deformation force Df (force against the pressing force P in edge bending; hereinafter also simply referred to the "deformation force") at the time of the first edge bending.
  • the deformation force Df is absent on the delivery side 3 where the steel plate S is absent, while the deformation force Df occurs on the entry side 2 even in a portion that is not positioned on the flat part 24a. Therefore, a center C3 of the deformation force Df is at a position displaced to the entry side 2 relative to the center C1 of the flat part 24a in the conveyance direction 1.
  • FIG. 9(a) illustrates the case of the second edge bending.
  • the deformation force Df also occurs on the delivery side 3.
  • the deformation amount is small as compared to the amount of the springback, and the center C3 of the deformation force Df is at a position displaced to the entry side 2 relative to the center C1 of the flat part.
  • the center C1 of the flat part 24a matches the center C2 of the pressing force P by the hydraulic cylinders 26, as illustrated in FIGS. 8(b) and 9(b) , the force that rotates the leading end portion side in the upward direction (pitching) is applied to the lower die 24, so that the amount of lifting of the lower die 24 becomes large on the delivery side 3.
  • FIGS. 10 and 11 schematically illustrate the deformation of the steel plate S and the distribution of the deformation force Df in the case where the center C1 of the flat part 24a of the lower die 24 is shifted only a displacement amount d to the delivery side 3 relative to the center C2 of the pressing force P according to the present invention.
  • FIG. 10 illustrates the first edge bending
  • FIG. 11 illustrates the second edge bending. It can be seen that the deformation force Df on the entry side 2 is small and the center C3 of the deformation force Df is positioned close to the center C2 of the pressing force P.
  • the inclination (pitching) of the lower die 24 such that the leading end portion is inclined upward during the edge bending can be suppressed by displacing the center C1 of the flat part 24a to the delivery side 3 relative to the center C2 of the pressing force P.
  • the preferable displacement amount d of the center C1 of the flat part 24a with respect to the center C2 of the pressing force P can be determined in the manner described below. As illustrated in FIGS. 8 to 11 , in the case where the bending deformation force Df that occurs on the entry side 2 of the flat part 24a varies substantially lineally, the sum thereof is half of the deformation force Df that occurs in the flat part 24a. That is, the deformation force Df is applied on the entry side 2 to the position half a bending deformation length L from the rear end of the flat part 24a.
  • the length L of the bending deformation occurred on the entry side 2 relative to the rear end of the flat part 24a varies with the amount of edge bending.
  • the width of the steel plate is also small. Therefore, the edge bending angle (a difference between the inclination angle in a range of 20 mm at the widthwise edge portion and the inclination angle of the widthwise middle portion) becomes large, and the length L over which the bending deformation occurs on the entry side 2 becomes large.
  • the displacement amount d of the center C1 of the flat part 24a with respect to the center C2 of the pressing force P be appropriately set depending on the width of the steel plate to be subjected to the edge bending. Specifically, it is preferable that the displacement amount d be set large with an increase in the edge bending angle.
  • the deformation force Df applied on the delivery side 3 is increased as the displacement amount d is increased.
  • the amount of lifting on the entry side 2 is increased, so that the amount of edge bending on the entry side 2 is increased. Therefore, it is preferable that the displacement amount d be not more than half the length L over which the bending deformation occurs on the entry side 2.
  • FIG. 12 illustrates the deformation of the steel plate S and the distribution of the deformation force Df in the case where the widthwise edges Sc and Sd of the trailing end portion Sb of the steel plate S are bent with the center C1 of the flat part 24a being displaced toward the delivery side 3 relative to the center C2 of the pressing force P.
  • the center C3 of the deformation force Df is positioned apart relative to the center C2 of the pressing force P (displaced to the delivery side 3) as compared with the cases of FIGS. 10 and 11 , and the force of rotating the front side of the lower die 24 downward (pitching) is applied to increase the amount of lifting on the entry side 2. Accordingly, it is desirable that the upper limit of the displacement amount d be determined such that the edge bending does not become excessively large at the trailing end portion Sb side of the steel plate S.
  • the lower die 24, of the pair of dies 23 and 24, that contacts the surface positioned at the outer side of edge bending of the widthwise edges Sc and Sd of the steel plate S to be subjected to edge bending has the flat part 24a that contacts the surface at the outer side of edge bending of the steel plate S during bending, and the widthwise edges Sc and Sd of the steel plate S are subjected to edge bending with the center C1 of the flat part 24a in the conveyance direction 1 being displaced to the delivery side 3 in the conveyance direction 1 relative to the center C2 of the pressing force P generated by the hydraulic cylinders 26 in the conveyance direction 1, so that the center C3 of the deformation force Df moves closer to the center C2 of the pressing force P.
  • shifting of the center C1 of the flat part 24a relative to the center C2 of the pressing force P can be achieved without introduction of a new facility, for example, by displacing the lower die 24 to the delivery side 3 in the conveyance direction 1 relative to the tool holder 25 and the hydraulic cylinders 26 or by displacing the hydraulic cylinders 26 to the entry side 2 in the conveyance direction 1 relative to the lower die 24 in an existing facility.
  • leading end portion Sa and the trailing end portion Sb of the steel plate S are portions that become the longitudinal ends of the steel pipe product excluding, in the presence of the tab plates St, the tab plates St and correspond to the end portions Sa and Sb of FIG. 2 . As illustrated in FIG.
  • the leading end portion Sa of the steel plate S lies on the delivery side 3 relative to the leading end portion of the flat part 24a, the portions where the tab plates St are welded are bent insufficiently and welding is discontinuous at a transition portion from the tab plates St to the steel plate S. Therefore, it is preferable that the position of the leading end portion Sa of the steel plate S be at a position not exceeding the leading end portion of the flat part 24a.
  • the trailing end portion Sb of the steel plate S is positioned in the front of the rear end portion of the flat part 24a in the final (final pass) edge bending, the bending deformation force Df does not occur on the entry side 2 relative to the trailing end portion Sb of the steel plate S.
  • the center C3 of the deformation force Df is displaced to the delivery side 3 relative to the center C2 of the pressing force P.
  • the displacement amount between the center C3 of the deformation force Df and the center C2 of the pressing force P becomes small, and it is possible to suppress the variation in the amount of edge bending.
  • the position of the trailing end portion Sb of the steel plate S be at a position not exceeding the rear end portion of the flat part 24a.
  • the lower die 24, which is one of the pair of dies may include a transition part 24b formed of a curved surface provided adjacent to the flat part 24a on the delivery side 3 in the conveyance direction 1.
  • the flat part 24a and the transition part 24b be connected to have a common tangent line.
  • transition part 24b having a curved shape continuous to the flat part 24a is provided on the delivery side 3, it is possible to provide a smooth step between the portion of the steel plate S that subjected to the edge bending in the previous pass and the portion subjected to the edge bending in the subsequent pass. At this time, the step becomes smoother when the change of the angle of the transition part 24b is small, i.e., the change of curvature is continuous, like an involute curve.
  • a similar transition part 24c may be provided on the entry side 2.
  • the transition part 24c such that the bending deformation length L (see, for example, FIG. 10 ) on the rear side relative to the rear end of the flat part 24a does not become large.
  • the length and angle variation of the transition part 24c are preferable to be set appropriately in consideration of the above points and the amount of edge bending that varies with the width of the steel plate S.
  • the length or the angle of the transition part 24c can be changed such that the range in which the transition part 24c contacts the steel plate S becomes not more than half the length L over which the bending deformation occurs on the entry side 2.
  • the bending may be performed by exchanging the positions of the upper die 23 and lower die 24 such that the upper side surface of the steel plate is positioned at the outer side of bending, which is opposite to the illustrated example.
  • the center C1 of a flat part of the upper die 23 in the conveyance direction that is positioned on the outer side of bending is displaced to the delivery side 3 relative to the center C2 of the pressing force P in the conveyance direction 1.
  • both of the upper die 23 and the lower die 24 may be configured to be moved in the directions in which they come closer to or move apart from each other.
  • the center C1 of the flat part in the conveyance direction of either one die that is positioned at the outer side of bending between the upper die 23 and the lower die 24 is displaced to the delivery side 3 the conveyance direction 1 relative to the center C2 of the pressing force P.
  • the number of hydraulic cylinders 26 that clamp the upper die 23 and the lower die 24 is not limited. The clamping may be performed through the use of one, two, or three or more hydraulic cylinders 26.
  • the actuator that clamps the upper die 23 and the lower die 24 is not limited to the hydraulic cylinder 26, but those of a mechanical type that performs clamping by converting the rotation movement of a motor into reciprocation movement with a crank mechanism or the like may be used.
  • An edge bending apparatus of a type that lifts the lower die with three hydraulic cylinders (actuators) arranged at intervals of 1000 mm is used for edge bending.
  • the central hydraulic cylinder is of a piston type, and the other two are of a ram type.
  • the output of the central hydraulic cylinder is half the output of each of the other hydraulic cylinders, and the output of the three hydraulic cylinders is 15 MN in total.
  • the upper die used for the edge bending has a processing face having a radius of curvature of 200 mm.
  • the flat part of the lower die has a straight shape forming an angle of 40 degrees with respect to the horizontal surface in the widthwise cross section.
  • the upper die has the same cross-sectional shape across the entire length.
  • die A the flat part has a length of 3000 mm and both ends thereof in the longitudinal direction are chamfered at R25 mm
  • die B another including a gentle transition part of R1600 mm formed continuously from the flat part having a length of 3000 mm on the delivery side 3
  • die C the other including a gentle transition part of R1600 mm formed continuously from the flat part having a length of 3000 mm on both of the entry side 2 and the delivery side 3
  • the steel plate is subjected to the edge bending four times while being fed 2600 mm at each time and then subjected to the fifth edge bending such that the trailing end of the steel plate is stopped at a predetermined position. After the edge bending, the edge bending angle is measured at a pitch of 0.1 m in the longitudinal direction.
  • a difference between the maximum and the minimum in the range of 10 m at the middle in the longitudinal direction is defined as a stationary portion variation, and a difference between the maximum and the minimum across the entire length is defined as an entire length variation, and an angular difference at a step portion where the difference is the largest is assessed as steepness.
  • the edge bending angle is determined from a difference between the inclination angle in a range of 20 mm at the widthwise edge portion and the inclination angle of the widthwise middle portion measured using an inclinometer.
  • U-ing press and O-ing press are performed for formation into a cylindrical shape, and the widthwise edges of the steel plate subjected to the edge bending are butted, and then the butted widthwise edges are welded to manufacture a steel pipe.
  • the peaking Dp of the steel pipe is measured in the longitudinal direction at a pitch of 0.1 m.
  • the peaking Dp is an index of a pointed shape of the butted portion and is a difference between an outer diameter of a regular steel pipe product (i.e., virtual perfect circle Se) and the actual shape Sp of the steel pipe as illustrated in FIG. 14 .
  • a regular steel pipe product i.e., virtual perfect circle Se
  • the butted portion of the steel pipe has an inwardly dent shape (minus peaking Dp-), while the amount of edge bending is excessively small, the butted portion of the steel pipe has an outwardly protruding shape (plus peaking Dp+).
  • a difference between the maximum and the minimum in the range of 10 m at the middle in the longitudinal direction is defined as a stationary portion variation, and a difference between the maximum and the minimum across the entire length is defined as an entire length variation.
  • the edge bending conditions and the formation results are indicated in Table 1.
  • the box of the leading/trailing end stop position indicates "steel plate” when the boundary between the steel plate and the tab plate is positioned at the delivery side end portion of the flat part of the lower die at the first edge bending and the boundary between the steel plate and the tab plate is positioned at the entry side end portion of the flat part of the lower die at the fifth edge bending.
  • "tab” is indicated when the entire length of the tab plate is included in the flat part of the lower die and the end portion of the steel plate is positioned 400 mm inward from the flat part of the lower die.
  • the feed boundary is hardly recognizable by sight and the angular difference between adjacent portions is about half of the variation of the edge bending of the stationary portion.
  • the feed boundary is clearly recognizable, and the angular difference between adjacent portions is the same as the variation of the edge bending angle of the stationary portion, and the edge bending angle sharply changes as compared with the case where the die B or die C is used.
  • a transition part may be formed at least on the delivery side 3.
  • the variation of the edge bending angle of the stationary portion is the same as the variation of the edge bending angle of the entire length
  • the variation of the peaking of the stationary portion is the same as the variation of the peaking of the entire length
  • the amount of edge bending is the same across the entire length.
  • the variation of the peaking is 0.9 to1.0 mm, which is not more than one sixth of ⁇ 3.2 mm, a peaking tolerance required by API standards, and it can be understood that the shape is superior.
  • the variations of the peaking and the edge bending angle are large.
  • the large difference in edge bending angle indicates that an abrupt change occurs at the step of the feed boundary. Since this abrupt change exceeds the profiling limit of a welding torch, the welding is stopped urgently.
  • a steel plate having a tensile strength of 550 MPa, a plate width of 2753 mm ⁇ a plate thickness of 38.1 mm ⁇ a length of 12 m including a tab plate having a length of 400 mm ⁇ a width of 100 mm attached to the leading end portion and the trailing end portion is prepared, and a steel pipe having an outer diameter of 914 mm is manufactured.
  • the upper die used for the edge bending has a processing face having a radius of curvature of 335 mm. The edge bending is performed with a goal of providing an edge bending angle of 24 degrees to a range of 180 mm at the widthwise edges of the steel plate.
  • the other edge bending conditions such as the edge bending apparatus, the lower die, and the feed amount of the steel plate are the same as those of Example 1.
  • the edge bending angle is measured after the edge bending, and then the steel plate is formed into a cylindrical shape by a bending press method, followed by welding to give a steel pipe.
  • the edge bending conditions and the formation results are indicated in Table 2.
  • the items and descriptions in Table 2 are the same as those of Example 1.
  • the center C1 of the flat part 24a of the lower die in the conveyance direction is set to be displaced 150 mm (displacement amount d) to the delivery side 3 in the conveyance direction 1 relative to the center of the central hydraulic cylinder, i.e., the center C2 of the pressing force P
  • the variation of the edge bending angle and the variation of the peaking of the stationary portion are suppressed to about half of those of conditions 7 and 8 (comparative examples) in which the center C1 of the flat part 24a of the lower die is set to match the center C2 of the central hydraulic cylinder.
  • the feed boundary is hardly recognizable by sight and the angular difference between adjacent portions is about half of the variation of the edge bending angle of the stationary portion.
  • the feed boundary is clearly recognizable, and the angular difference between adjacent portions is the same as the variation of the edge bending angle of the stationary portion, and the edge bending angle sharply changes as compared with the case where the die B or die C is used.
  • a transition part may be formed at least on the delivery side 3.
  • the variation of the edge bending angle of the stationary portion is the same as the variation of the edge bending angle of the entire length
  • the variation of the peaking of the stationary portion is the same as the variation of the peaking of the entire length
  • the amount of edge bending is the same across the entire length.
  • the variation of the peaking is 0.8 to 0.9 mm, which is not more than one seventh of ⁇ 3.2 mm, a peaking tolerance required by API standards, and it can be understood that the shape is superior.
  • the variations of the peaking and the edge bending angle are larger.
  • the large difference in edge bending angle indicates that an abrupt change occurs at the step of the feed boundary. Since this abrupt change exceeds the profiling limit of a welding torch, the welding is stopped urgently.
  • a steel plate having a tensile strength of 500 MPa, a plate width of 3232 mm ⁇ a plate thickness of 38.1 mm ⁇ a length of 12 m including a tab plate having a length of 400 mm ⁇ a width of 100 mm attached to the leading end portion and the trailing end portion is prepared, and a steel pipe having an outer diameter of 1067 mm is manufactured.
  • the upper die used for the edge bending has a processing face having a radius of curvature of 400 mm. The edge bending is performed with a goal of providing an edge bending angle of 22 degrees to a range of 195 mm at the widthwise edges of the steel plate.
  • the other edge bending conditions such as the edge bending apparatus, the lower die, and the feed amount of the steel plate are the same as those of Example 1.
  • the edge bending angle is measured after the edge bending, and then the steel plate is formed into a cylindrical shape by U-ing press and O-ing press, followed by welding to give a steel pipe.
  • the edge bending conditions and the formation results are indicated in Table 3.
  • the items and descriptions in Table 3 are the same as those of Example 1.
  • Table 3 Under conditions 1 to 6 (inventive examples) in which the center C1 of the flat part of the lower die in the conveyance direction is set to be displaced 150 mm (displacement amount d) to the delivery side 3 in the conveyance direction relative to the center C2 of the central hydraulic cylinder, the variation of the edge bending angle and the variation of the peaking of the stationary portion are suppressed to about half of those of conditions 7 and 8 (comparative examples) in which the center C1 of the flat part of the lower die is set to match the center C2 of the central hydraulic cylinder.
  • the feed boundary is visually hardly recognizable and the angular difference between adjacent portions is about half of the variation of the edge bending angle of the stationary portion.
  • the feed boundary is clearly recognizable, and the angular difference between adjacent portions is the same as the variation of the edge bending angle of the stationary portion, and the edge bending angle sharply changes as compared with the case where the die B or die C is used.
  • a transition part may be formed at least on the delivery side 3.
  • the variation of the edge bending angle of the stationary portion is the same as the variation of the edge bending angle of the entire length
  • the variation of the peaking of the stationary portion is the same as the variation of the peaking of the entire length
  • the amount of edge bending is the same across the entire length.
  • the variation of the peaking is 0.7 to 0.8 mm, which is not more than one eighth of ⁇ 3.2 mm, a peaking tolerance required by API standards, and it can be understood that the shape is superior.
  • the variations of the peaking and the edge bending angle are large.
  • the large difference in edge bending angle indicates that an abrupt change occurs at the step of the feed boundary. Since this abrupt change exceeds the profiling limit of a welding torch, the welding is stopped urgently.
  • Example 2 a steel plate having a tensile strength of 550 MPa, a plate width of 2753 mm ⁇ a plate thickness of 38.1 mm ⁇ a length of 12 m including a tab plate having a length of 400 mm ⁇ a width of 100 mm attached to the leading end portion and the trailing end portion is prepared, and a steel pipe having an outer diameter of 914 mm is manufactured.
  • the upper die used for the edge bending has a processing face having a radius of curvature of 335 mm, and the flat part of the lower die has a processing face having a radius of curvature of 335 mm so as to match the upper die.
  • the edge bending is performed with a goal of providing an edge bending angle of 24 degrees to a range of 180 mm at the widthwise edges of the steel plate by using three types of lower dies: one in which the flat part has a length of 3000 mm and both ends thereof in the longitudinal direction are chamfered at C25 mm (hereinafter called the "die A"); another including a gentle transition part of R1200 mm formed continuously from the flat part having a length of 3000 mm on the delivery side 3 in the conveyance direction (hereinafter called the "die B"); and the other including a gentle transition part of R1200 mm formed continuously from the flat part having a length of 3000 mm on both of the entry side 2 and the delivery side 3 (hereinafter called the "die C").
  • the other edge bending conditions such as the edge bending apparatus and the feed amount of the steel plate are the same as those of Example 2.
  • the edge bending angle is measured after the edge bending, and then the steel plate is formed into a cylindrical shape by a bending press method, followed by welding to give a steel pipe.
  • the edge bending conditions and the formation results are indicated in Table 4.
  • the items and descriptions in Table 4 are the same as those of Example 1.
  • the feed boundary is visually hardly recognizable and the angular difference between adjacent portions is about half of the variation of the edge bending angle of the stationary portion.
  • the feed boundary is clearly recognizable, and the angular difference between adjacent portions is the same as the variation of the edge bending angle of the stationary portion, and the edge bending angle sharply changes as compared with the case where the die B or die C is used.
  • a transition part may be formed at least on the delivery side 3.
  • the variation of the peaking is 0.7 to 0.9 mm, which is not more than one seventh of ⁇ 3.2 mm, a peaking tolerance required by API standards, and it can be understood that the shape is superior.
  • the variations of the peaking and the edge bending angle are large.
  • the large difference in edge bending angle indicates that an abrupt change occurs at the step of the feed boundary. Since this abrupt change exceeds the profiling limit of a welding torch, the welding is stopped urgently.
  • Example 3 a steel plate having a tensile strength of 500 MPa, a plate width of 3232 mm ⁇ a plate thickness of 38.1 mm ⁇ a length of 12 m including a tab plate having a length of 400 mm ⁇ a width of 100 mm attached to the leading end portion and the trailing end portion is prepared, and a steel pipe having an outer diameter of 1067 mm is manufactured.
  • the upper die used for the edge bending has a processing face having a radius of curvature of 400 mm, and the flat part of the lower die has a processing face having a radius of curvature of 400 mm so as to match the upper die.
  • the edge bending is performed with a goal of providing an edge bending angle of 22 degrees to a range of 195 mm at the widthwise edges of the steel plate by using three types of lower dies: one in which the flat part has a length of 3000 mm and both ends thereof in the longitudinal direction are chamfered at C25 mm (hereinafter called the "die A"); another including a gentle transition part of R1200 mm formed continuously from the flat part having a length of 3000 mm on the delivery side 3 in the longitudinal direction (hereinafter called the "die B"); and the other including a gentle transition part of R1200 mm formed continuously from the flat part having a length of 3000 mm on both of the entry side 2 and the delivery side 3 (hereinafter called the "die C").
  • the other edge bending conditions such as the edge bending apparatus and the feed amount of the steel plate are the same as those of Example 3.
  • the edge bending angle is measured after the edge bending, and then the steel plate is formed into a cylindrical shape by a bending press method, followed by welding to give a steel pipe.
  • the edge bending conditions and the formation results are indicated in Table 5.
  • the items and descriptions in Table 5 are the same as those of Example 1.
  • the feed boundary is visually hardly recognizable and the angular difference between adjacent portions is about half of the variation of the edge bending angle of the stationary portion.
  • the feed boundary is clearly recognizable, and the angular difference between adjacent portions is the same as the variation of the edge bending angle of the stationary portion, and the edge bending angle sharply changes as compared with the case where the die B or die C is used.
  • a transition part may be formed at least on the delivery side 3.
  • the variation of the peaking is 0.7 to 0.9 mm, which is not more than one seventh of ⁇ 3.2 mm, a peaking tolerance required by API standards, and it can be understood that the shape is superior.
  • the variations of the peaking and the edge bending angle are large.
  • the large difference in edge bending angle indicates that an abrupt change occurs at the step of the feed boundary. Since this abrupt change exceeds the profiling limit of a welding torch, the welding is stopped urgently.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (9)

  1. Procédé de cintrage de flanc d'une plaque d'acier (S) en utilisant un appareil de cintrage de flanc d'une plaque d'acier (20) comprenant :
    une paire de matrices configurées pour être agencées en correspondance vis-à-vis d'un flanc en largeur (Sc, Sd) d'une plaque d'acier (S);
    un actionneur configuré pour serrer la paire de matrices avec une force de pressage prédéterminée ; et
    un mécanisme de transport (21) configuré pour transporter la plaque d'acier (S) dans une direction le long d'une direction longitudinale de la plaque d'acier (S) en tant que direction de transport (1),
    dans lequel le flanc en largeur (Sc, Sd) de la plaque d'acier (S) est soumis à un cintrage de flanc sur une longueur entière en mettant en oeuvre un cintrage de flanc du flanc en largeur (Sc, Sd) de la plaque d'acier (S) plusieurs fois par la paire de matrices tandis que la plaque d'acier (S) est transportée de manière intermittente par le mécanisme de transport (21),
    caractérisé en ce que
    l'une de la paire de matrices qui entre en contact avec une surface positionnée au niveau du côté externe de cintrage de flanc du flanc en largeur (Sc, Sc) de la plaque d'acier (S) à cintrer présente une partie plate (24a) qui entre en contact avec la surface positionnée au niveau du côté externe de cintrage de flanc, dans lequel la partie plate (24a) indique une portion qui est étendue linéairement le long de la direction de transport (1), et un cintrage de flanc est mis en oeuvre sur le flanc en largeur (Sc, Sd) de la plaque d'acier (S), avec un centre de la partie plate (24a) dans la direction de transport (1) se trouvant à une position déplacée vers un côté de distribution (3) dans la direction de transport (1) par rapport à un centre de la force de pressage générée par l'actionneur dans la direction de transport (1).
  2. Procédé de cintrage de flanc d'une plaque d'acier (S) selon la revendication 1,
    dans lequel la matrice qui entre en contact avec la surface positionnée au niveau du côté externe de cintrage de flanc comprend une partie de transition (24b, 24c) formée d'une surface incurvée disposée de manière adjacente à la partie plate (24a) au moins sur un côté de distribution (3) dans la direction de transport (1), et la partie plate (24a) et la partie de transition (24b, 24c) sont reliées pour présenter une ligne tangente commune.
  3. Procédé de cintrage de flanc d'une plaque d'acier (S) selon la revendication 1 ou la revendication 2,
    dans lequel une portion d'extrémité d'attaque (Sa) de la plaque d'acier (S) dans la direction de transport (1) est à une position correspondant à une extrémité avant de la partie plate (24a) dans un premier passage de cintrage du flanc en largeur (Sc, Sd) de la plaque d'acier (S).
  4. Procédé de cintrage de flanc d'une plaque d'acier (S) selon l'une quelconque des revendications 1 à 3,
    dans lequel une portion d'extrémité de fuite (Sb) de la plaque d'acier (S) dans la direction de transport (1) est à une position correspondant à une extrémité arrière de la partie plate (24a) dans un passage final pour cintrer le flanc en largeur (Sc, Sd) de la plaque d'acier (S).
  5. Procédé de fabrication d'un tuyau d'acier comprenant le processus de cintrage de flanc d'une plaque d'acier (S) selon la revendication 1, comprenant en outre
    un processus de formation de cylindre dans lequel la plaque d'acier (S) avec les flancs en largeur (Sc, Sd) soumis à un cintrage de flanc est formée selon une forme cylindrique et les flancs en largeur (Sc, Sd) de la plaque d'acier (S) sont mis en butée l'un contre l'autre ; et
    un processus de jonction dans lequel les flancs en largeur (Sc, Sd) mis en butée de la plaque d'acier (S) sont soudés.
  6. Appareil de cintrage de flanc d'une plaque d'acier (20) comprenant :
    une paire de matrices configurées pour être agencées en correspondance vis-à-vis d'un flanc en largeur (Sc, Sd) d'une plaque d'acier (S);
    un actionneur configuré pour serrer la paire de matrices avec une force de pressage prédéterminée ; et
    un mécanisme de transport (21) configuré pour transporter la plaque d'acier (S) dans une direction le long d'une direction longitudinale de la plaque d'acier (S) en tant que direction de transport (1),
    dans lequel le flanc en largeur (Sc, Sd) de la plaque d'acier (S) est soumis à un cintrage de flanc sur une longueur entière en mettant en oeuvre un cintrage de flanc du flanc en largeur (Sc, Sd) de la plaque d'acier (S) plusieurs fois par la paire de matrices tandis que la plaque d'acier (S) est transportée de manière intermittente par le mécanisme de transport (21),
    caractérisé en ce que
    l'une de la paire de matrices qui entre en contact avec une surface positionnée au niveau du côté externe de cintrage de flanc du flanc en largeur (Sc, Sd) de la plaque d'acier (S) à cintrer présente une partie plate (24a) qui entre en contact avec la surface positionnée au niveau du côté externe de cintrage de flanc, dans lequel la partie plate (24a) indique une portion qui est étendue de façon linéaire le long de la direction de transport (1),
    et un centre de la partie plate (24a) dans la direction de transport (1) est à une position déplacée vers un côté de distribution (3) dans la direction de transport (1) par rapport à un centre de la force de pressage générée par l'actionneur dans la direction de transport (1).
  7. Appareil de cintrage de flanc d'une plaque d'acier (20) selon la revendication 6,
    dans lequel la matrice qui entre en contact avec la surface positionnée au niveau du côté externe de cintrage de flanc comprend une partie de transition (24b, 24c) formée d'une surface incurvée disposée de manière adjacente à la partie plate (24a) au moins sur un côté de distribution (3) dans la direction de transport (1), et la partie plate (24a) et la partie de transition (24b, 24c) sont reliées pour présenter une ligne tangente commune.
  8. Installation de fabrication d'un tuyau d'acier comprenant :
    un appareil de cintrage de flanc d'une plaque d'acier (20) selon la revendication 6,
    un appareil (30) de formation de cylindre configuré pour former la plaque d'acier avec les flancs en largeur (Sc, Sd) soumis à un cintrage de flanc selon une forme cylindrique et mettre en butée les flancs en largeur (Sc, Sd) de la plaque d'acier (S) l'un contre l'autre ; et
    un appareil (40) de jonction configuré pour souder les flancs en largeur (Sc, Sd) mis en butée de la plaque d'acier (S).
  9. Installation de fabrication d'un tuyau d'acier selon la revendication 8,
    dans lequel la matrice qui entre en contact avec la surface positionnée au niveau du côté externe de cintrage de flanc comprend une partie de transition (24b, 24c) formée d'une surface incurvée disposée de manière adjacente à la partie plate (24a) au moins sur un côté de distribution (3) dans la direction de transport (1), et la partie plate (24a) et la partie de transition (24b, 24c) sont reliées pour présenter une ligne tangente commune.
EP19777128.0A 2018-03-30 2019-03-04 Procédé et dispositif pour cintrer le flanc d'une plaque d'acier, et procédé et équipement de fabrication de tuyau en acier Active EP3778050B1 (fr)

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PCT/JP2019/008297 WO2019188001A1 (fr) 2018-03-30 2019-03-04 Procédé et dispositif pour cintrer le flanc d'une plaque d'acier, et procédé et équipement de fabrication de tuyau en acier

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EP3778050A1 EP3778050A1 (fr) 2021-02-17
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WO2019188001A1 (fr) 2019-10-03
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