WO2019188001A1 - 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
WO2019188001A1
WO2019188001A1 PCT/JP2019/008297 JP2019008297W WO2019188001A1 WO 2019188001 A1 WO2019188001 A1 WO 2019188001A1 JP 2019008297 W JP2019008297 W JP 2019008297W WO 2019188001 A1 WO2019188001 A1 WO 2019188001A1
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WO
WIPO (PCT)
Prior art keywords
bending
steel sheet
steel plate
steel
width direction
Prior art date
Application number
PCT/JP2019/008297
Other languages
English (en)
Japanese (ja)
Inventor
正之 堀江
俊博 三輪
鉄也 ▲徳▼原
秀徳 開
Original Assignee
Ｊｆｅスチール株式会社
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 Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201980023045.1A priority Critical patent/CN111954580B/zh
Priority to RU2020133777A priority patent/RU2741916C1/ru
Priority to JP2019527260A priority patent/JP6566231B1/ja
Priority to KR1020207026722A priority patent/KR102325590B1/ko
Priority to BR112020020095-6A priority patent/BR112020020095B1/pt
Priority to EP19777128.0A priority patent/EP3778050B1/fr
Publication of WO2019188001A1 publication Critical patent/WO2019188001A1/fr

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    • 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
    • B21D5/01—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
    • B21D5/02—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 end bending method and apparatus for bending a steel sheet in the width direction end portion in a plurality of times in the longitudinal direction of the steel sheet. Further, the present invention is a method of manufacturing a steel pipe by forming a steel plate subjected to end bending into a cylindrical shape, butting the end portions in the width direction, and joining the end portions in the width direction of the abutted steel plates by welding. And related to equipment.
  • Patent Documents 1 to 3 disclose methods for obtaining a good shape at the butt portion.
  • the feed length b is prescribed
  • the length Lc of the bending region is defined according to the thickness and strength of the steel plate.
  • the radius R1 of the upper die, the horizontal distance u from the center of curvature of the upper die to the end of the steel plate, and the pressing force w are defined according to the thickness and strength of the steel plate.
  • Patent Document 4 proposes a method for manufacturing a steel pipe with little variation in the shape of the butt portion based on the strength information of the steel sheet.
  • Patent Document 5 proposes a method of continuously performing end bending.
  • JP-A-8-294727 Japanese Patent Laid-Open No. 10-2111520 JP 2008-119710 A JP 2009-6358 A Japanese Unexamined Patent Publication No. 7-32049 JP 2007-245218 A
  • Patent Documents 1 to 4 are for the purpose of optimizing the shape of a certain cross section of the steel sheet, and the variation of the end bending shape in the longitudinal direction of the steel sheet has not been studied.
  • the end bending shape may not be uniform in the longitudinal direction of the steel sheet, leading to poor welding of the butt portion and poor butt portion shape of the product steel pipe.
  • the technique described in Patent Document 6 relates to measures against opening deformation, and considers the case where the bending to a part in the longitudinal direction is performed a plurality of times while intermittently feeding the steel sheet in the longitudinal direction. It has not been.
  • the object of the present invention is to eliminate the above-mentioned problems of the prior art and to obtain an end bending shape with little variation in the entire length without introducing new equipment.
  • the first aspect includes a pair of molds arranged corresponding to the widthwise ends of the steel sheet, an actuator for clamping the pair of molds with a predetermined pressing force, and the steel sheet along its longitudinal direction. And a bending mechanism for conveying the steel sheet in the width direction by the pair of molds while intermittently conveying the steel sheet by the conveying mechanism. Is a method of bending the steel sheet that is bent over the entire length in the width direction end of the steel sheet, and of the pair of molds, the width direction end of the steel sheet to be bent is formed.
  • the mold on the side that is in contact with the surface that is the outside of the bending has a flat portion that contacts the surface that is the outside of the bending at the time of bending, and the actuator is centered in the transport direction of the flat portion.
  • the generated pressing force is set against the center in the transport direction. It is an end of the steel sheet bending method which performs bending the end portion in the width direction of the steel sheet in a state shifted to the downstream side in the transport direction Te.
  • the mold on the side in contact with the surface to be outside of the bending is a curved surface provided adjacent to at least the downstream side in the transport direction of the flat portion. It is an end bending method of the steel plate which has an escape part and the said flat part and the said escape part are connected with a common tangent.
  • the third aspect is the first pass of bending forming the steel sheet in the width direction end, and the front end of the steel sheet in the transport direction is aligned with the front end of the flat part. This is a method of bending the end of the steel sheet at a certain position.
  • the tail end of the steel sheet in the transport direction is the flat part. It is the edge bending method of the steel plate made into the position match
  • a pair of molds arranged corresponding to the widthwise end of the steel sheet, an actuator for clamping the pair of molds with a predetermined pressing force, and a direction along the longitudinal direction of the steel sheet
  • a steel plate end bending apparatus that transports the steel sheet as a transport direction, and a plurality of bends of the width direction end of the steel sheet by the pair of molds while intermittently transporting the steel sheet by the transport mechanism.
  • the end of the steel sheet is bent over the entire length in the width direction end of the steel sheet, and the steel sheet bent at both ends in the width direction is formed into a cylindrical shape.
  • a method for manufacturing a steel pipe comprising: a cylindrical forming step for abutting direction end portions and a joining step for welding width direction end portions of the abutted steel plates;
  • the end of the steel sheet in the width direction A mold having a flat surface that is in contact with the surface that is the outside of the bending at the time of bending, and the center of the flat portion in the transport direction is the pressing force generated by the actuator. It is a manufacturing method of the steel pipe which carries out bending forming to the width direction edge part of a steel plate in the state shifted to the lower stream side in the conveyance direction with respect to the center in the conveyance direction.
  • a pair of molds arranged corresponding to the widthwise ends of the steel sheet, an actuator for clamping the pair of molds with a predetermined pressing force, and the steel sheet along the longitudinal direction thereof.
  • a conveying mechanism that conveys the direction as the conveying direction, and by bending the steel sheet intermittently by the pair of molds, the steel plate is bent a plurality of times in the width direction by the pair of molds.
  • An end bending apparatus for a steel plate that performs bending over the entire length in the width direction end of the pair of dies, on the surface that is the outside of the bending at the width direction end of the steel plate to be bent.
  • the mold on the contact side has a flat portion that contacts the surface that is the outside of the bending at the time of bending, and the center of the flat portion in the transport direction is the pressing force generated by the actuator. Downstream in the transport direction with respect to the center in the transport direction Is an end bending apparatus of the steel sheet being further.
  • the mold on the side in contact with the outer surface of the bend is a curved surface provided adjacent to at least the downstream side in the transport direction of the flat portion. It has an escape part, and the said flat part and the said escape part are the end bending apparatuses of the steel plate connected with a common tangent.
  • the pair of molds arranged corresponding to the widthwise ends of the steel sheet, the actuator for clamping the pair of molds with a predetermined pressing force, and the steel sheet along the longitudinal direction thereof.
  • a conveying mechanism that conveys the direction as the conveying direction, and by intermittently conveying the steel sheet by the conveying mechanism, by bending the steel sheet in the width direction end by the pair of molds a plurality of times,
  • a steel plate end bending apparatus that performs bending over the entire length in the width direction end of the steel plate, and a steel plate that is bent at both width direction ends are formed into a cylindrical shape, and the width direction ends of the steel plates are joined together.
  • a steel pipe manufacturing facility comprising a cylindrical forming device to be abutted and a joining device for welding end portions in the width direction of the abutted steel plates, and is bent among the pair of molds of the end bending device. Touch the surface of the end of the steel sheet in the width direction
  • the mold has a flat portion that abuts on the surface that is the outside of the bend during bending, and the center of the flat portion in the transport direction is the transport direction of the pressing force generated by the actuator.
  • the mold on the side in contact with the surface to be outside of the bending is a curved surface provided adjacent to at least the downstream side in the transport direction of the flat portion.
  • the flat part and the relief part are facilities for manufacturing a steel pipe that have a relief part and are connected with a common tangent line.
  • the mold on the side in contact with the outer surface of the bending at the end in the width direction of the steel sheet to be bent contacts the outer surface of the steel sheet during bending.
  • An end portion in the width direction of the steel sheet that has a flat portion in contact with the flat portion and that the center in the conveyance direction of the flat portion is shifted downstream in the conveyance direction with respect to the center in the conveyance direction of the pressing force generated by the actuator.
  • FIG. 1 It is sectional drawing in the conveyance direction which shows the press mechanism in the conventional end bending apparatus of a steel plate, (a) has shown the state before end bending, (b) has shown the state at the time of end bending. It is a graph which shows the change of the steel plate shape by end bending.
  • (A) shows the relationship between the center of the pressing force, the center of the flat portion, and the center of the bending deformation force when the first end bending process is performed using the conventional steel sheet end bending apparatus shown in FIG.
  • FIG. (B) is a diagram schematically showing a state in which the lower mold is inclined due to the relationship between the center of the pressing force, the center of the flat portion, and the center of the bending deformation force.
  • FIG. (A) shows the relationship between the center of the press force, the center of the flat portion, and the center of the bending deformation force when the second end bending process is performed using the conventional steel sheet end bending apparatus shown in FIG.
  • (B) is a diagram schematically showing a state in which the lower mold is inclined due to the relationship between the center of the pressing force, the center of the flat portion, and the center of the bending deformation force. It is a figure which shows the relationship between the center of a press force, the center of a flat part, and the center of the bending deformation force at the time of performing the first end bending process using the end bending apparatus of the steel plate of one Embodiment of this invention. .
  • FIG. 1 It is a figure which shows the relationship between the center of a press force, the center of a flat part, and the center of a bending deformation force at the time of performing the second end bending process using the end bending apparatus of the steel plate of one Embodiment of this invention.
  • (A) is the relationship between the center of the pressing force, the center of the flat part, and the center of the bending deformation force when the end bending process of the final round is performed using the steel sheet end bending apparatus of one embodiment of the present invention.
  • (B) is a diagram schematically showing a state in which the lower mold is inclined in the opposite direction due to the relationship between the center of the pressing force, the center of the flat portion, and the center of the bending deformation force. is there.
  • front or front means “downstream side” or “direction from the upstream side to the downstream side” as viewed in the conveying direction of the steel sheet in the end bending apparatus described later, and “rear” or “ “Backward” is the opposite direction.
  • FIG. 1 shows an outline of a steel pipe manufacturing method and equipment according to an embodiment of the present invention for manufacturing a steel pipe from a steel sheet cut to a predetermined size.
  • the steel plate S cut to a predetermined size is subjected to groove processing on its side surface by the edge mirror 10 or the edge planar.
  • the tab plate St is welded to the front end portion (longitudinal front end portion) Sa and the tail end portion (longitudinal rear end portion) Sb of the steel plate S.
  • the tab plate St may not be provided. is there.
  • end bending is performed by the end bending apparatus (C press) 20 according to one embodiment of the present invention (end bending process), and a cylindrical shape is formed by the cylindrical forming apparatus 30 (cylindrical forming process).
  • the cylindrical forming apparatus 30 is not limited to the one formed by the U press 30A for first forming the steel sheet S subjected to end bending forming into a U shape, and then the O press 30B for forming an O shape (cylindrical shape). It is also possible to use a bending press 30C that is provided with a feeding mechanism that feeds S in the width direction and that gradually forms a final cylindrical shape by performing three-point bending while sequentially feeding the steel plates S in the width direction.
  • FIG. 2 shows an example of the steel sheet S before end bending.
  • the width of the steel sheet S ranges widely, for example, from 1200 mm to 5100 mm, depending on the outer diameter of the product steel pipe. Further, the length of the steel plate is often about 12 m, which is the standard length of a line pipe.
  • a tab plate St is welded to each end in the width direction of the longitudinal end portion Sa and the tail end portion Sb of the steel sheet S to be the steel pipe body, but there may be no tab plate St.
  • FIG. 3 shows a schematic configuration of the end bending apparatus 20 for a steel plate.
  • the steel plate end bending apparatus 20 has a transport mechanism 21 that transports the steel sheet S along the longitudinal direction thereof as the transport direction 1, and the downstream side 3 in the transport direction as the front, and the left width direction end Sc with a predetermined curvature.
  • an interval adjusting mechanism (not shown) for adjusting the interval.
  • the conveyance mechanism 21 includes a plurality of conveyance rolls 21a disposed before and after the press mechanisms 22A and 22B.
  • Each transport roll 21a is configured such that its roll axis is oriented in a direction orthogonal to the transport direction of the steel sheet S and is rotated at a speed synchronized with each other by a motor and a transmission mechanism (not shown).
  • FIG. 4 shows a cross section in the width direction of the press mechanism 22A that bends and deforms the left width direction end portion Sc of the steel sheet S in the direction from the upstream side 2 to the downstream side 3 in the conveying direction 1 of the steel sheet S.
  • the pressing mechanism 22A and the pressing mechanism 22B are symmetrical and have the same configuration, and thus the detailed illustration of the pressing mechanism 22B is omitted.
  • the press mechanisms 22A and 22B push up the upper mold 23 and the lower mold 24 as a pair of molds opposed to each other in the vertical direction and the lower mold 24 together with the tool holder 25, and clamp the mold with a predetermined pressing force.
  • a hydraulic cylinder 26 as an actuator and a clamp mechanism 27 that releasably holds the steel sheet S inside the upper die 23 and the lower die 24 in the width direction are provided.
  • the length in the longitudinal direction of the steel plate S of the lower die 24 and the upper die 23 is shorter than the length of the steel plate S, and the steel plate S is shifted in the longitudinal direction by the transport mechanism 21 (intermittently feeding).
  • the bending is performed a plurality of times, and end bending is applied to the width direction ends Sc and Sd of the steel sheet S over the entire length.
  • FIG. 5 is a cross-section in the width direction at the same position as in FIG. 4, but shows a state where the lower mold 24 is pushed up by the hydraulic cylinder 26 and clamped.
  • the hydraulic cylinder 26 is advanced from the state before the end bending shown by the broken line, the lower mold 24 is pushed up to the position of the solid line, and the width direction ends Sc and Sd of the steel sheet S are arc-shaped of the upper mold 23. It is bent into a shape along the molding surface.
  • the width at which end bending is performed varies depending on the width of the steel sheet S, but is generally about 100 mm to 400 mm.
  • the clamp mechanism 27 for clamping the steel plate S during end bending is illustrated, but the present invention is not limited to the presence or absence of the clamp mechanism 27.
  • FIG. 6 is a cross-sectional view along the conveying direction 1 showing the bending of the width direction ends Sc and Sd of the steel sheet S.
  • the steel sheet S is carried in from the left side of the figure and carried out to the right side.
  • the lower mold 24 has a flat portion 24a that mainly imparts end bending.
  • the flat portion 24a refers to a flat portion in a cross section along the transport direction 1 that extends linearly along the transport direction, and does not mean flat in the cross section in the width direction.
  • the shape of the flat portion 24a in the cross section in the width direction is not particularly limited, and may be an arc shape or a linear shape inclined so as to face the inner side in the width direction.
  • the effective length of the lower mold 24, that is, the length of the flat portion 24a is set to be larger than the width that gives end bending.
  • the length of the flat portion 24a is 3 m to 5 m, and is about 10 times as wide as the end bending. Therefore, a plurality of hydraulic cylinders 26 for pushing up the lower mold 24 are usually arranged along the transport direction.
  • a piston type hydraulic cylinder 26 that generates thrust in both upward and downward directions is generally used in combination with a ram type hydraulic cylinder 26 that generates thrust only during upward movement.
  • a piston type hydraulic cylinder 26 is arranged in the center of the conveying direction, and a ram type hydraulic cylinder 26 is arranged before and after the cylinder.
  • a ram type hydraulic cylinder 26 is arranged before and after the cylinder.
  • FIG. 6A shows a state in which the steel sheet S is conveyed by a conveying mechanism 21 by a predetermined conveying distance after the press mechanisms 22A and 22B are bent at the width direction ends Sc and Sd of the steel sheet S. Has been.
  • This conveyance distance is set smaller than the length of the flat portion 24a of the lower mold 24.
  • the rear end portion of the portion to which end bending has already been applied is positioned on the flat portion 24a of the lower mold 24, and the transition portion between the pre-formed portion and the non-formed portion is formed in the next end bend forming. It is surely bent.
  • FIG. 6A shows a state in which the steel sheet S is conveyed by a conveying mechanism 21 by a predetermined conveying distance after the press mechanisms 22A and 22B are bent at the width direction ends Sc and Sd of the steel sheet S. Has been.
  • This conveyance distance is set smaller than the length of the flat portion 24a of the lower mold 24.
  • the hydraulic cylinder 26 is a lower metal plate in a state in which the steel plate S is arranged so that the rear end portion of the portion to which end bending has already been applied is positioned on the flat portion 24a.
  • the mold 24 is pushed up, and the end portions Sc and Sd in the width direction of the steel plate S are bent as shown by solid lines.
  • the range bent in the previous step is bent again by the amount corresponding to the spring back, and bending deformation is also caused in the upstream side 2 (left side of the drawing) portion of the steel sheet S that is not located on the flat portion 24a of the lower mold 24.
  • the end bend angle at the first end bend is plotted with ⁇
  • the end bend angle at the second end bend is plotted with ⁇
  • the range of the flat portion 24a of the lower mold at the first end bending is indicated by Ra1
  • the range of the flat portion 24a of the lower mold at the second end bending is indicated by Ra2.
  • the end bending angle of the front end portion Sa of the steel sheet S is increased (Da), and on the upstream side 2, bending is also applied to a portion outside the flat portion 24a, and the length is about 0.6 m. It has become.
  • the portion bent at the first end is further bent and becomes larger toward the downstream side 3 (Dc).
  • the end bending angle is slightly increased near the end of the flat portion 24 a, and the bend is applied at a length of about 0.6 m even at a portion off the flat portion 24 a as in the first time.
  • the amount by which the lower mold 24 is pushed up is considered to be caused by an inclination (rotation in the pitching direction) that is 2 mm larger on the downstream side 3 and 0.04 degrees with the tip end side facing upward (rotation in the pitching direction).
  • FIG. 8A shows the distribution of the deformation of the steel sheet S and the bending deformation force Df (the force that opposes the pressing force P at the time of end bending, and is also simply referred to as “deformation force”) in the first end bending. Is shown schematically. Since there is no steel plate S on the downstream side 3, there is no deformation force Df, and on the upstream side 2, the deformation force Df is generated even at a portion off the flat portion 24 a. For this reason, the center C3 of the deformation force Df is shifted to the upstream side 2 from the center C1 in the transport direction 1 of the flat portion 24a.
  • FIG. 8A shows the distribution of the deformation of the steel sheet S and the bending deformation force Df (the force that opposes the pressing force P at the time of end bending, and is also simply referred to as “deformation force”) in the first end bending. Is shown schematically. Since there is no steel plate S on the downstream side 3, there is no deformation force Df, and
  • FIGS. FIG. 10 shows the first end bending
  • FIG. 11 shows the second end bending. It can be seen that the deformation force Df on the upstream side 2 becomes smaller, and the center C3 of the deformation force Df approaches the center C2 of the pressing force P.
  • the suitable shift amount d with respect to the center C2 of the press force P of the center C1 of the flat part 24a can be calculated
  • the shift amount d of the center C1 of the flat portion 24a is set to 1/4 of the bending deformation length L on the upstream side 2 from the rear end of the flat portion 24a, the center C2 of the pressing force P by the hydraulic cylinder 26 is obtained.
  • a symmetrical force acts on the lower mold 24, and the inclination of the lower mold 24 can be minimized.
  • the length L at which bending deformation occurs on the upstream side 2 from the rear end of the flat portion 24a differs depending on the end bending amount. If the outer diameter of the steel pipe to be manufactured is small, the width of the steel sheet is also reduced, so that the end bending angle (difference between the inclination angle of the plate end portion 20 mm range and the inclination angle of the width center portion) increases, and bending deformation occurs on the upstream side 2. The resulting length L increases.
  • the steel plate width illustrated in FIG. 7 is 2755 mm
  • the length L causing the bending deformation on the upstream side 2 is about 0.6 m
  • 1 ⁇ 4 of 150 mm is the optimum shift amount d.
  • the shift amount d of the center C1 of the flat portion 24a with respect to the center C2 of the pressing force P is preferably set as appropriate according to the width of the steel plate that is the object of end bending, and specifically, the end bending angle described above. It is preferable to set the shift amount d to be larger as the value becomes larger.
  • the shift amount d when the shift amount d increases, the deformation force Df acting on the downstream side 3 increases, and in this case, the push-up amount on the upstream side 2 increases and the end bending amount on the upstream side 2 increases.
  • the shift amount d is not more than 1 ⁇ 2 of the length L at which the bending deformation occurs on the upstream side 2.
  • the center C1 of the flat portion 24a when the center C1 of the flat portion 24a is shifted to the downstream side 3 with respect to the center C2 of the pressing force P, the widthwise ends Sc and Sd of the tail end Sb of the steel plate S are bent and formed. The distribution of the deformation of the steel sheet S and the deformation force Df is shown.
  • the center C3 of the deformation force Df is farther from the center C2 of the pressing force P (shifted to the downstream side 3) than in the case of FIGS. 10 and 11, and the front side of the lower mold 24 is rotated downward ( (Pitching) force is applied, and the upstream 2 push-up amount increases. Therefore, it is desirable to determine the upper limit of the shift amount d so that the end bending does not become excessive on the tail end portion Sb side of the steel sheet S.
  • the width direction end portion Sc of the steel plate S to be bent. , Sd, the lower die 24 on the side in contact with the outer surface of the bend has a flat portion 24a that abuts on the outer surface of the bend of the steel sheet S during bending, and the flat portion 24a in the conveying direction 1
  • the center C1 is bent and formed in the width direction ends Sc and Sd of the steel sheet S with the pressing force P generated by the hydraulic cylinder 26 shifted to the downstream side 3 in the transport direction 1 with respect to the center C2 in the transport direction 1.
  • the center C3 of the deformation force Df approaches the center C2 of the pressing force P, so that the inclination of the lower mold 24 during end bending can be suppressed, and the end in the width direction of the steel sheet S in the longitudinal direction can be suppressed. Variations in the amount of bending deformation of the parts Sc and Sd can be reduced. Further, the shift of the center C1 of the flat portion 24a with respect to the center C2 of the pressing force P does not introduce new equipment, for example, transports the lower mold 24 to the tool holder 25 and the hydraulic cylinder 26 in existing equipment. It can be realized by shifting to the downstream side 3 in the direction or by shifting the hydraulic cylinder 26 to the upstream side 2 in the transport direction with respect to the lower mold 24.
  • the tip end portion Sa and the tail end portion Sb of the steel plate S are portions that are longitudinal end portions of the steel pipe product excluding the tab plate St when the tab plate St is present, and the end portion Sa in FIG. , Sb.
  • the first end (first pass) end bending, when the front end portion Sa of the steel sheet S is located behind the front end portion of the flat portion 24a, bending is performed on the downstream side 3 from the front end portion Sa. Deformation force Df does not occur.
  • the center C3 of the deformation force Df is shifted to the upstream side 2 from the center C2 of the pressing force P.
  • the front end portion Sa of the steel sheet S By bringing the front end portion Sa of the steel sheet S closer to the front end portion of the flat portion 24a, the amount of deviation between the center C3 of the deformation force Df and the center C2 of the pressing force P is reduced, and fluctuations in the end bending amount can be suppressed.
  • the front end portion Sa of the steel plate S is on the downstream side 3 with respect to the front end portion of the flat portion 24a, the portion where the tab plate St is welded is insufficiently bent and welding is not performed at the portion where the tab plate St moves to the steel plate S.
  • the position of the front end portion Sa of the steel sheet S is a position that does not exceed the front end portion of the flat portion 24a.
  • the tail end portion Sb of the steel sheet S is located in front of the rear end portion of the flat portion 24a, it is more than that.
  • the bending deformation force Df does not occur on the upstream side 2. For this reason, the center C3 of the deformation force Df is shifted to the downstream side 3 from the center C2 of the pressing force P.
  • the position of the tail end portion Sb of the steel sheet S is preferably set to a position that does not exceed the rear end portion of the flat portion 24a.
  • the lower mold 24 is subjected to a rotational force in a direction in which the tip end side is directed upward, and the amount of push-up on the downstream side 3 is large, and the lower mold 24 is inclined. End bending is performed in the state. As a result, the downstream end of the flat portion 24a comes into contact with the already bent portion, and, for example, as shown in FIG. 7, the steel plate that contacts the downstream end during the second end bending is deformed. There is a concern that a large step is formed with the end-bent portion of the downstream side 3 at the first time. If there is a sharp shape change, the welding becomes discontinuous at that portion, and defects are generated or the welding is interrupted. Therefore, it is desirable that the change in the end bending angle be smooth (small).
  • the lower mold 24, which is one mold, has a flat portion 24a.
  • a relief portion 24b made of a curved surface provided adjacent to the downstream side 3 in the transport direction.
  • the flat portion 24a and the relief portion 24b may be connected with a common tangent line. preferable.
  • the end bending was performed at the portion where the end bending was performed in the previous pass of the steel sheet S and the subsequent pass. It is possible to make the step with the part smooth.
  • the step becomes smoother as the change in the angle of the escape portion 24b is made smaller as in the involute curve, that is, the curvature change is made continuous.
  • a similar relief portion 24 c can be provided on the upstream side 2.
  • the escape portion 24c it is necessary for the escape portion 24c not to have a bending deformation length L (for example, see FIG. 10) on the rear side of the rear end of the flat portion 24a.
  • the length and angle change of the relief portion 24c As a guideline, the length and angle of the relief portion 24c can be changed so that the range in which the relief portion 24c contacts the steel sheet S is 1/2 or less of the length L at which the bending deformation occurs on the upstream side 2. .
  • the embodiment of the present invention has been described based on the illustrated example.
  • the present invention is not limited to this, and can be appropriately changed, modified, added, and the like within the scope of the claims.
  • the case where the lower mold 24 is pushed up by the hydraulic cylinder 26 to press the width direction ends Sc and Sd of the steel sheet S against the upper mold 23 and bending is performed has been described.
  • the width direction ends Sc and Sd of the steel sheet S are pressed against the lower mold 24 and bent to the plate in the same direction as in the illustrated example. It is good also as composition which performs.
  • the arrangement of the upper mold 23 and the lower mold 24 may be reversed in the direction opposite to the illustrated example, and bending may be performed so that the upper surface of the plate is outside the bend.
  • the center C1 in the transport direction of the flat portion of the upper mold 23 that is positioned is shifted to the downstream side 3 in the transport direction with respect to the center C2 of the pressing force P.
  • both the upper mold 23 and the lower mold 24 may be moved in the direction of approaching and separating from each other. In this case, the upper mold 23 and the lower mold 24 are located outside the bend.
  • the center C1 in the transport direction of the flat portion may be shifted to the downstream side 3 in the transport direction with respect to the center C2 of the pressing force P.
  • the number of hydraulic cylinders 26 for clamping the upper mold 23 and the lower mold 24 is not limited, and the mold clamping can be performed using one, two, three or more hydraulic cylinders 26. Further, the actuator for clamping the upper mold 23 and the lower mold 24 is not limited to the hydraulic cylinder 26, and a mechanical type that performs clamping by converting the rotational motion of the motor into a reciprocating motion by a crank mechanism or the like is used. May be.
  • the end bending of the steel sheet was performed under different conditions, and the fluctuation in the longitudinal direction of the end bending and the influence on the welding in the subsequent process were investigated.
  • Example 1 A steel plate having a tensile strength of 500 MPa, a plate width of 1676 mm, a plate thickness of 25.4 mm, and a length of 12 m is prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, and a steel pipe having an outer diameter of 559 mm is prepared.
  • Manufactured For the end bending, an end bending apparatus of a type in which the lower mold is pushed up by three hydraulic cylinders (actuators) arranged at an interval of 1000 mm was used.
  • the central hydraulic cylinder is a piston type, and the other two are ram types.
  • the central hydraulic cylinder is half the output of each of the other hydraulic cylinders, for a total of 15 MN output.
  • the upper mold used for end bending has a molding surface with a radius of curvature of 200 mm, and the flat part of the lower mold is linear with an angle of 40 degrees with respect to the horizontal plane in the cross section in the width direction.
  • the upper mold has the same cross-sectional shape as the entire length.
  • the lower mold has a flat part with a length of 3000 mm and chamfered with R25 mm at both ends in the longitudinal direction (hereinafter referred to as “mold A”), and a continuous part from the flat part with a length of 3000 mm to R1600 mm.
  • die B With a gentle relief portion on the downstream side 3 (hereinafter referred to as “die B”), and provided on both the upstream side 2 and the downstream side 3 (hereinafter referred to as “die C”).
  • die B a gentle relief portion on the downstream side 3
  • die C Three types were used.
  • the end bending angle (difference between the inclination angle of the plate edge portion 20 mm range and the inclination angle of the width center portion) is set to 33 ° in the width direction end portion 155 mm of the steel plate, and the end bending is performed four times while feeding the steel plate 2600 mm at a time. After performing, the end bending of the 5th time was performed so that the tail end position of a steel plate might stop in a predetermined position. After end bending, the end bending angle is measured at a pitch of 0.1 m in the longitudinal direction, the maximum and minimum difference in the central 10 m range in the longitudinal direction is the steady portion variation, and the maximum and minimum difference in the total length is the total length variation.
  • the angle difference of the step portion having the largest difference is evaluated as the steepness.
  • the end bend angle was determined by the difference between the tilt angle in the 20 mm range of the plate end measured using an inclinometer and the tilt angle at the center of the width. Subsequently, U-presses and O-presses were applied, the ends in the width direction of the steel sheets that were formed into a cylindrical shape and end-bent were butted together, and then the abutted width-direction ends were welded together to produce a steel pipe.
  • the peaking Dp of the steel pipe was measured at a pitch of 0.1 m in the longitudinal direction.
  • the peaking Dp is an index of the sharp shape of the butt portion, and as shown in FIG.
  • the peaking Dp Similar to the end bending angle, the peaking Dp also has the maximum and minimum difference in the central 10 m range in the longitudinal direction as the steady portion fluctuation, and the maximum and minimum difference in the total length as the full length fluctuation.
  • Table 1 shows the end bending conditions and the molding results.
  • the boundary between the steel plate and the tab plate is located at the downstream end of the flat part of the lower mold at the first end bending.
  • the case where the boundary between the steel plate and the tab plate is positioned at the upstream end of the flat portion of the lower mold during the end bending is denoted as “steel plate”.
  • tab is the case where the entire length of the tab plate is included in the flat portion of the lower mold, and the end of the steel plate is positioned 400 mm inside from the flat portion of the lower mold. .
  • the center C1 in the transport direction of the flat portion 24a of the lower mold is 150 mm (shift amount) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P to the downstream side 3 in the transport direction.
  • the end bending angle fluctuation Dc and peaking fluctuation of the stationary part coincide with the center C2 of the central hydraulic cylinder at the center C1 of the flat part 24a of the lower mold. It was suppressed to about half of the conditions 7 and 8 (comparative example) set in this way.
  • the feeding boundary portion is The difference in the angle between adjacent parts is almost half of the fluctuation of the end bending angle of the stationary part, whereas in the conditions 1, 2, 7, and 8 using the mold A, the boundary between the feeds is hardly noticeable.
  • the angle difference between the adjacent parts is the same as the end bending angle fluctuation of the stationary part, and the end bending angle changes sharply as compared with the case where the molds B and C are used.
  • the mold C may have a smaller end bending angle variation, but there is almost no difference, and at least the downstream side 3 escapes. It turns out that a part should be provided.
  • the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
  • the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
  • the end bending amount at the end portion was increased and the variation in the entire length was increased.
  • the peaking fluctuation is 0.9 to 1.0 mm, which is 1/6 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard, and the shape is excellent.
  • 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, and a length of 12 m is prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, and a steel pipe having an outer diameter of 914 mm is prepared.
  • the upper die used for end bending had a forming surface with a radius of curvature of 335 mm, and end bending was performed in the range of 180 mm in the width direction end of the steel plate with an end bending angle of 24 degrees.
  • the other end bending conditions such as an end bending apparatus, a lower mold, and a steel sheet feed amount, were the same as those in Example 1. After the end bending, the end bending angle was measured, and then formed into a cylindrical shape by a bending press method and welded to obtain a steel pipe.
  • Table 2 shows the end bending conditions and the molding results.
  • the items and notations in Table 2 are the same as in Example 1.
  • the center C1 in the transport direction of the flat portion 24a of the lower mold is 150 mm (shift amount) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P to the downstream side 3 in the transport direction.
  • the end bending angle fluctuation and peaking fluctuation of the stationary part are set so that the center C1 of the flat part of the lower mold coincides with the center C2 of the central hydraulic cylinder. It was suppressed to about half of the set conditions 7 and 8 (comparative example).
  • the feeding boundary portion is The difference in the angle between adjacent parts is almost half of the fluctuation of the end bending angle of the stationary part, whereas in the conditions 1, 2, 7, and 8 using the mold A, the boundary between the feeds is hardly noticeable.
  • the angle difference between the adjacent parts is the same as the end bending angle fluctuation of the stationary part, and the end bending angle changes sharply as compared with the case where the molds B and C are used.
  • the mold C may have a smaller end bending angle variation, but there is almost no difference, and at least the downstream side 3 escapes. It turns out that a part should be provided.
  • the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
  • the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
  • the end bending amount at the end portion was increased and the variation in the entire length was increased.
  • the peaking fluctuation is 0.8 to 0.9 mm, which is 1/7 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard. It is understood that is superior.
  • 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, and a length of 12 m is prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, and a steel pipe having an outer diameter of 1067 mm. Manufactured.
  • the upper mold used for end bending has a molding surface with a radius of curvature of 400 mm. End bending was performed in the range of 195 mm in the width direction end of the steel plate with an end bending angle of 22 degrees as a target.
  • end bending conditions such as an end bending apparatus, a lower mold, and a steel sheet feed amount, were the same as those in Example 1. After end bending, the end bending angle was measured, U-pressed and O-pressed, formed into a cylindrical shape, and welded to form a steel pipe.
  • Table 3 shows the end bending conditions and the molding results.
  • the items and notations in Table 3 are the same as in Example 1.
  • the center 1 in the transport direction of the flat part of the lower mold is set to be shifted 150 mm (shift amount d) from the center C2 of the central hydraulic cylinder to the downstream 3 in the transport direction.
  • 6 invention example
  • conditions 7 and 8 comparative example in which the end bending angle fluctuation and peaking fluctuation of the stationary part are set so that the center C1 of the flat part of the lower mold coincides with the center C2 of the central hydraulic cylinder. ) was reduced to about half.
  • the feeding boundary portion is The difference in the angle between adjacent parts is almost half of the fluctuation of the end bending angle of the stationary part, whereas in the conditions 1, 2, 7, and 8 using the mold A, the boundary between the feeds is hardly noticeable.
  • the angle difference between the adjacent parts is the same as the end bending angle fluctuation of the stationary part, and the end bending angle changes sharply as compared with the case where the molds B and C are used.
  • the mold C may have a smaller end bending angle variation, but there is almost no difference, and at least the downstream side 3 escapes. It turns out that a part should be provided.
  • the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
  • the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
  • the end bending amount at the end portion was increased and the variation in the entire length was increased.
  • the peaking fluctuation is 0.7 to 0.8 mm, which is 1/8 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard. It is understood that is superior.
  • Example 4 As in 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, and a length of 12 m was prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, respectively. A steel pipe having an outer diameter of 914 mm was manufactured.
  • the upper mold used for end bending has a molding surface with a curvature radius of 335 mm, and the flat portion of the lower mold has a molding surface with a curvature radius of 335 mm so as to overlap the upper mold.
  • the upper mold has the same cross-sectional shape as the entire length.
  • the lower mold has a flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction (hereinafter referred to as “mold A”), and a continuous part from the flat part with a length of 3000 mm to R1200 mm.
  • mold A flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction
  • die B flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction
  • die C both the upstream side 2 and the downstream side 3
  • Example 2 The other end bending conditions, such as the end bending apparatus and the steel sheet feed amount, were the same as in Example 2. After the end bending, the bending angle was measured, and then formed into a cylindrical shape by a bending press method and welded to obtain a steel pipe. Table 4 shows the end bending conditions and the molding results. The items and notations in Table 4 are the same as in Example 1.
  • the center C1 of the lower mold flat portion 24a in the transport direction is 150 mm (shift amount) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P to the downstream side 3 in the transport direction.
  • the end bending angle fluctuation and peaking fluctuation of the stationary part are set so that the center C1 of the flat part of the lower mold coincides with the center C2 of the central hydraulic cylinder. It was suppressed to about half of the set conditions 7 and 8 (comparative example).
  • the feeding boundary portion is The difference in the angle between adjacent parts is almost half of the fluctuation of the end bending angle of the stationary part, whereas in the conditions 1, 2, 7, and 8 using the mold A, the boundary between the feeds is hardly noticeable.
  • the angle difference between the adjacent parts is the same as the end bending angle fluctuation of the stationary part, and the end bending angle changes sharply as compared with the case where the molds B and C are used.
  • the mold C may have a smaller end bending angle variation, but there is almost no difference, and at least the downstream side 3 escapes. It turns out that a part should be provided.
  • the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
  • the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
  • the end bending amount at the end portion was increased and the variation in the entire length was increased.
  • the peaking fluctuation is 0.8 to 0.9 mm, which is 1/7 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard. It is understood that is superior.
  • Example 5 As in 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, and a length of 12 m was prepared by attaching a tab plate having a length of 400 mm and a width of 100 mm to the tip and tail ends, respectively. A steel pipe having an outer diameter of 1067 mm was manufactured.
  • the upper die used for end bending has a molding surface with a radius of curvature of 400 mm, and the flat portion of the lower die has a molding surface with a radius of curvature of 400 mm so as to overlap the upper die.
  • the upper mold has the same cross-sectional shape as the entire length.
  • the lower mold has a flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction (hereinafter referred to as “mold A”), and a continuous part from the flat part with a length of 3000 mm to R1200 mm.
  • mold A flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction
  • die B flat part with a length of 3000 mm and a C25 mm chamfer at both ends in the longitudinal direction
  • die C both the upstream side 2 and the downstream side 3
  • end bending was performed in the range of the end portion of the steel sheet in the width direction of 195 mm with an end bending angle of 22 degrees.
  • Example 3 The other end bending conditions, such as the end bending apparatus and the steel sheet feed amount, were the same as in Example 3. After the end bending, the end bending angle was measured, and then formed into a cylindrical shape by a bending press method and welded to obtain a steel pipe. Table 5 shows the end bending conditions and the molding results. The items and notations in Table 5 are the same as in Example 1.
  • the center C1 in the transport direction of the flat portion 24a of the lower mold is 150 mm (shift amount) from the center of the central hydraulic cylinder, that is, the center C2 of the pressing force P to the downstream side 3 in the transport direction.
  • the end bending angle fluctuation and peaking fluctuation of the stationary part are set so that the center C1 of the flat part of the lower mold coincides with the center C2 of the central hydraulic cylinder. It was suppressed to about half of the set conditions 7 and 8 (comparative example).
  • the feeding boundary portion is The difference in the angle between adjacent parts is almost half of the fluctuation of the end bending angle of the stationary part, whereas in the conditions 1, 2, 7, and 8 using the mold A, the boundary between the feeds is hardly noticeable.
  • the angle difference between the adjacent parts is the same as the end bending angle fluctuation of the stationary part, and the end bending angle changes sharply as compared with the case where the molds B and C are used.
  • the mold C may have a smaller end bending angle variation, but there is almost no difference, and at least the downstream side 3 escapes. It turns out that a part should be provided.
  • the end bending angle variation of the steady portion and the end bending angle variation of the full length are the same.
  • the peaking fluctuation of the steady part and the peaking fluctuation of the full length are the same, and the end bending amount is the same over the entire length, whereas the longitudinal end of the steel plate is placed inside the flat part of the lower mold.
  • the end bending amount at the end portion was increased and the variation in the entire length was increased.
  • the peaking fluctuation is 0.7 to 0.8 mm, which is 1/8 or less of the peaking tolerance ⁇ 3.2 mm required by the API standard. It is understood that is superior.

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

Abstract

La présente invention concerne une procédé pour cintrer le flanc d'une plaque d'acier. Le procédé permet, par soumission du flanc de sens largeur (Sc, Sd) de la plaque d'acier (S) à un cintrage répété au moyen d'une paire de matrices (23, 24) pendant que la plaque d'acier (S) est transportée par intermittence par un mécanisme de transport (21), de cintrer le flanc de sens largeur (Sc, Sd) de la plaque d'acier (S) sur toute sa longueur. Parmi la paire de matrices (23, 24), la matrice (24), située sur le côté qui est en contact avec la surface du flanc de sens largeur (Sc, Sd) de la plaque d'acier (S) qui est cintré et qui constituera l'extérieur du cintrage, comporte une zone plate (24a) qui entre en contact avec le côté qui devient l'extérieur du cintrage pendant le cintrage. Le flanc de sens largeur (Sc, Sd) de la plaque d'acier (S) est cintré dans un état dans lequel le centre (C1) de ladite zone plate dans la direction de transport (1) a été décalé vers l'aval (3) dans la direction de transport (1) par rapport au centre (C2), dans la direction de transport (1), de la force de pression produite par un actionneur.
PCT/JP2019/008297 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 WO2019188001A1 (fr)

Priority Applications (6)

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CN201980023045.1A CN111954580B (zh) 2018-03-30 2019-03-04 钢板的端部弯曲方法及装置以及钢管的制造方法及设备
RU2020133777A RU2741916C1 (ru) 2018-03-30 2019-03-04 Способ и устройство для гибки краев толстого стального листа и способ и установка для изготовления стальной трубы
JP2019527260A JP6566231B1 (ja) 2018-03-30 2019-03-04 鋼板の端曲げ方法および装置並びに鋼管の製造方法および設備
KR1020207026722A KR102325590B1 (ko) 2018-03-30 2019-03-04 강판의 단굽힘 방법 및 장치 그리고 강관의 제조 방법 및 설비
BR112020020095-6A BR112020020095B1 (pt) 2018-03-30 2019-03-04 Método e aparelho para flexionar arestas de chapa de aço, e método e instalação para fabricar tubo de aço
EP19777128.0A EP3778050B1 (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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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114160708A (zh) * 2022-01-07 2022-03-11 厦门势拓御能科技有限公司 一种扁线成型冲压模具及冲压设备
CN114346593A (zh) * 2021-11-26 2022-04-15 武汉船用机械有限责任公司 异形零件的加工制造方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5650510U (fr) * 1979-09-27 1981-05-06
JPS5881517A (ja) * 1981-11-09 1983-05-16 Nippon Steel Corp 長尺半割管の連続成形方法
JPS5910918U (ja) * 1982-07-13 1984-01-24 住友金属工業株式会社 Ｕｏｅ製管用プレス
JPH0732049A (ja) 1993-07-14 1995-02-03 Nippon Steel Corp Ｕｏｅ鋼管の成形方法
JPH08294727A (ja) 1995-04-25 1996-11-12 Nkk Corp Ｕｏｅ鋼管の製造方法
JPH10211520A (ja) 1997-01-29 1998-08-11 Nkk Corp Ｕｏｅ鋼管の製造方法
JP2007245218A (ja) 2006-03-17 2007-09-27 Sumitomo Metal Ind Ltd Ｕプレス装置およびｕプレス方法
JP2008119710A (ja) 2006-11-09 2008-05-29 Nippon Steel Corp 高強度溶接鋼管の製造方法
JP2009006358A (ja) 2007-06-28 2009-01-15 Nippon Steel Corp 鋼管製造設備及び鋼管製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1719126A1 (ru) * 1990-02-26 1992-03-15 Ростовский-На-Дону Проектно-Конструкторский Технологический Институт Комбайностроения Производственного Объединения "Ростсельмаш" Им.Ю.В.Андропова Штамп дл гибки и плющени краев листовых заготовок
AT393639B (de) * 1990-03-15 1991-11-25 Lift Verkaufsgeraete Gmbh Blechbiegevorrichtung
JP2001009524A (ja) * 1999-06-30 2001-01-16 Toyota Motor Corp 筒状体の製造方法
KR100530325B1 (ko) * 2001-04-30 2005-11-22 주식회사 포스코 가변식 스트립 선단부 절곡장치
DE102007012316B9 (de) * 2007-03-09 2009-06-10 Europipe Gmbh Verfahren und Anbiegepresse zum Anbiegen der Randstreifen eines zu einem Schlitzrohr zu formenden ebenen Bleches
KR20100106700A (ko) * 2009-03-24 2010-10-04 진영희 자동차의 고무부싱용 관체 및 그 제조방법
JP5696357B2 (ja) * 2009-11-27 2015-04-08 セイコーエプソン株式会社 搬送ローラーの製造方法、搬送ローラー、印刷装置
RU2638465C1 (ru) * 2017-01-13 2017-12-13 Евгений Владимирович Михайлов Способ и устройство для гибки тонколистового металла

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5650510U (fr) * 1979-09-27 1981-05-06
JPS5881517A (ja) * 1981-11-09 1983-05-16 Nippon Steel Corp 長尺半割管の連続成形方法
JPS5910918U (ja) * 1982-07-13 1984-01-24 住友金属工業株式会社 Ｕｏｅ製管用プレス
JPH0732049A (ja) 1993-07-14 1995-02-03 Nippon Steel Corp Ｕｏｅ鋼管の成形方法
JPH08294727A (ja) 1995-04-25 1996-11-12 Nkk Corp Ｕｏｅ鋼管の製造方法
JPH10211520A (ja) 1997-01-29 1998-08-11 Nkk Corp Ｕｏｅ鋼管の製造方法
JP2007245218A (ja) 2006-03-17 2007-09-27 Sumitomo Metal Ind Ltd Ｕプレス装置およびｕプレス方法
JP2008119710A (ja) 2006-11-09 2008-05-29 Nippon Steel Corp 高強度溶接鋼管の製造方法
JP2009006358A (ja) 2007-06-28 2009-01-15 Nippon Steel Corp 鋼管製造設備及び鋼管製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3778050A4

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114346593A (zh) * 2021-11-26 2022-04-15 武汉船用机械有限责任公司 异形零件的加工制造方法
CN114160708A (zh) * 2022-01-07 2022-03-11 厦门势拓御能科技有限公司 一种扁线成型冲压模具及冲压设备

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EP3778050A4 (fr) 2021-05-19
RU2741916C1 (ru) 2021-01-29
BR112020020095A2 (pt) 2021-01-05
KR20200119328A (ko) 2020-10-19
SA520420221B1 (ar) 2022-09-01
EP3778050A1 (fr) 2021-02-17
KR102325590B1 (ko) 2021-11-11

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