EP3006133B1 - Method for producing steel pipe - Google Patents

Method for producing steel pipe Download PDF

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Publication number
EP3006133B1
EP3006133B1 EP13885377.5A EP13885377A EP3006133B1 EP 3006133 B1 EP3006133 B1 EP 3006133B1 EP 13885377 A EP13885377 A EP 13885377A EP 3006133 B1 EP3006133 B1 EP 3006133B1
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EP
European Patent Office
Prior art keywords
pipe
ratio
steel pipe
pipe expanding
expanding
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
EP13885377.5A
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German (de)
English (en)
French (fr)
Other versions
EP3006133A4 (en
EP3006133A1 (en
Inventor
Toshihiro Miwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
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Publication date
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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
    • 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
    • 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
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/14—Recontouring
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B21D39/20—Tube expanders with mandrels, e.g. expandable
    • 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

Definitions

  • the present invention relates to a method for manufacturing a steel pipe according to the preamble of claim 1 that includes a pipe expanding step of expanding a steel pipe from the inside using a pipe expanding machine in which a plurality of pipe expanding dies having an outer circumferential surface with a circular arcuate section are circumferentially arranged.
  • a pipe expanding step of expanding a steel pipe from the inside using a pipe expanding machine in which a plurality of pipe expanding dies having an outer circumferential surface with a circular arcuate section are circumferentially arranged.
  • a method is for example disclosed in JP-A-2012170977 .
  • a manufacturing process for UOE steel pipes for, for example, oil well pipes and line pipes includes a step of applying beveling to edges in a width direction of a thick steel plate served as a material; a forming step of bending the width-direction edges of the thick steel plate using a pressing machine, and thereafter forming the thick steel plate into a cylindrical shape by forming the thick steel plate sequentially into a U-shape and an O-shape so that the width-direction edges of the thick steel plate face each other; a tack welding step of restraining the cylindrical thick steel plate, abutting the facing width-direction edges of the thick steel plate against each other, and tack-welding the edges together; a permanent welding step of seam-welding the inner and outer surfaces of the butted portion of the thick steel plate using a submerged arc welding method; and a pipe expanding step of forming a steel pipe to have predetermined levels of roundness, straightness, and outside diameter by expanding the steel pipe from the inside using a
  • the forming step of forming the thick steel plate into a cylindrical shape so that the edges in the width direction of the thick steel plate face each other often uses a bending press method that presses down, with a punch, a thick steel plate placed on two linear dies arranged in parallel with a certain space therebetween, instead of the method that performs the U-forming and the O-forming using the pressing machine.
  • a bending press method needs only a smaller pressing force than that in the case of performing the U-forming and the O-forming, although the number of times of pressing increases. For this reason, the bending press method is particularly suitable for manufacturing steel pipes of thick materials or high-strength materials.
  • the UOE steel pipes for oil well pipes or line pipes are used by joining the pipe ends of the UOE steel pipes together using circumferential welding at a laying site.
  • the pipe ends of the UOE steel pipes cannot be abutted and joined together during the circumferential welding.
  • the steel pipe is likely to be deformed by pressure when the UOE steel pipe is laid in high-pressure ambience such as a deep sea. From such a background, technologies have been proposed that improve the roundness of the UOE steel pipe in the pipe expanding step (refer to Patent Literature 1 to 4).
  • the ratio of a curvature radius R1 of the outer circumferential surface of each of the pipe expanding dies to a target radius R0 of the inner surface of the UOE steel pipe (hereinafter expressed as a pipe expanding R ratio) is desirably close to 1.0.
  • the contact pressure of the pipe expanding die to the inner surface of the UOE steel pipe increases as the pipe expanding R ratio is closer to 1.0, so that the pipe expanding die cracks.
  • the pipe expanding R ratio has been limited up to approximately 0.9, and it has been difficult to further improve the roundness of the UOE steel pipe. From such a background, it has been desired to provide a technology that can manufacture steel pipes with high roundness without cracking the pipe expanding die.
  • the present invention is made and aims to provide a method for manufacturing a steel pipe that can manufacture the steel pipe with high roundness without cracking a pipe expanding die.
  • a method for manufacturing a steel pipe according to the present invention includes: forming a steel plate into a cylindrical shape by a bending press method that presses down the steel plate with a punch having, at a leading edge thereof, an outer circumferential surface with a circular arcuate section so that edges in a width direction of the steel plate face each other; butting and welding together the edges in the width direction of the steel plate; and expanding the steel pipe from the inside using a pipe expanding machine in which a plurality of pipe expanding dies having an outer circumferential surface with a circular arcuate section are circumferentially arranged, wherein a pipe expanding R ratio that is a ratio of a curvature radius of the outer circumferential surface of each of the pipe expanding dies to a target radius of an inner surface of the steel pipe and a punch R ratio that is a ratio of a curvature radius of an outer circumferential surface of a leading end of the punch to the target radius of the inner surface of the steel pipe are both less than 1, and the pipe expanding R ratio and the punch
  • the pipe expanding R ratio further falls in a range from 0.94 to less than 1.0.
  • a steel pipe with high roundness can be manufactured without cracking a pipe expanding die.
  • a steel pipe has a better shape after being seam-welded if a forming step by a bending press method (also called a press bending method) is employed instead of press forming into a U-shape and an O-shape (hereinafter called a UO process) than if the UO process is performed.
  • a bending press method also called a press bending method
  • UO process O-shape
  • undeformed potions do not continue long in the circumferential direction when the steel plate is formed into a tubular shape, even though small undulation exists as a whole.
  • each of the forming operations into a U-shape and an O-shape is performed in one step.
  • undeformed potions may continue long in the circumferential direction when the steel plate is formed into a tubular shape.
  • FIG. 1 is a conceptual diagram illustrating the procedure of the forming step by the bending press method in the method for manufacturing the steel pipe according to the embodiment of the present invention.
  • the arrows in FIG. 1 indicate movements of a steel plate S and a punch 2
  • the outer surface side of the steel plate S is supported on two linear dies 1a and 1b arranged in parallel with a certain space therebetween, and, at the same time, an operation of pressing down, with the punch 2, a position on the inner surface side of the steel plate S corresponding to the space between the dies 1a and 1b is repeatedly performed from both edges in the width direction toward the center in the width direction of the steel plate S. This can form the steel plate S into the cylindrical shape.
  • FIG. 2 is a schematic diagram illustrating the configuration of the pipe expanding machine used in the method for manufacturing the steel pipe as according to the embodiment of the present invention.
  • FIG. 3 is a schematic diagram illustrating a section of the steel pipe.
  • the configuration of the pipe expanding machine to be used in the present invention is not limited to the configuration illustrated in FIGS. 2 and 3 .
  • this pipe expanding machine 11 used in the method for manufacturing the steel pipe as according to the embodiment of the present invention includes a shaft-like boom 12 with the leading end thereof inserted from one end of a steel pipe P and a pipe expanding head 14 that is provided at the leading end of the boom 12 and expands the steel pipe P when the diameter is expanded in the direction orthogonal to the axis.
  • the pipe expanding head 14 includes a tapered outer circumferential surface 15 and a pipe expanding die 16.
  • the tapered outer circumferential surface 15 is provided at the leading end of the boom 12, and decreases in diameter from the leading end side toward the base end side of the boom 12.
  • the pipe expanding die 16 slidingly contacts the tapered outer circumferential surface 15, and includes a tapered inner circumferential surface 16a that decreases in diameter from the leading end side toward the base end side of the boom 12 and a die outer circumferential surface 16b that faces the inner circumferential surface of the steel pipe P. As illustrated in FIG. 3 , a plurality of such pipe expanding dies 16 are provided along the circumferential direction of the tapered outer circumferential surface 15.
  • the pipe expanding dies 16 are positioned in a pipe expansion start position, and the boom 12 is moved back from the pipe expansion start position. This displaces each of the pipe expanding dies 16 slidingly contacting the tapered outer circumferential surface 15 in the radial direction by way of a wedge action, and expands the steel pipe P.
  • the undulation in the cross-sectional shape of the steel pipe P becomes small, and the cross-sectional shape of the steel pipe P becomes close to a perfect circular shape.
  • the boom 12 is moved forward to the pipe expansion start position, and after the pipe expanding dies 16 are returned inward in the direction orthogonal to the axis by a release mechanism, which is not illustrated, the boom 12 is further moved forward by an amount corresponding to a pitch (length in the axial direction) of the pipe expanding dies 16.
  • the pipe expanding dies 16 are positioned in a new expansion position, and then, the operation described above is repeated. This can expand the steel pipe P over the entire length thereof in increments of the pitch of the pipe expanding dies 16.
  • FIGS. 4 and 5 are diagrams illustrating the outside diameter (solid line) and the inside diameter (dashed line) of the steel pipe P after the steel pipe P is formed by the forming step by the bending press method and expanded at a pipe expanding R ratio of 0.903 and 0.986, respectively.
  • Each of FIGS. 4 and 5 illustrates a deviation from an average radius of radii at respective points of the steel pipe P at a scale enlarged by a common factor.
  • FIGS. 6 and 7 are diagrams each illustrating a relation among the pipe expanding R ratio, a punch R ratio, and the roundness of the steel pipe.
  • the punch R ratio refers to a ratio of a curvature radius RP1 of the outer circumferential surface at the leading end of the punch to a target radius R0 of the inner surface of steel pipe P.
  • the value of the pipe expanding R ratio may be in a range from 0.94 to less than 1. Pipe expanding R ratio ⁇ ⁇ 0.3 ⁇ Punch R ratio + 1.18
  • a steel pipe with high roundness can be manufactured without cracking the pipe expanding die.
EP13885377.5A 2013-05-24 2013-05-24 Method for producing steel pipe Active EP3006133B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/064525 WO2014188599A1 (ja) 2013-05-24 2013-05-24 鋼管の製造方法

Publications (3)

Publication Number Publication Date
EP3006133A1 EP3006133A1 (en) 2016-04-13
EP3006133A4 EP3006133A4 (en) 2016-06-29
EP3006133B1 true EP3006133B1 (en) 2017-08-16

Family

ID=51409473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13885377.5A Active EP3006133B1 (en) 2013-05-24 2013-05-24 Method for producing steel pipe

Country Status (5)

Country Link
EP (1) EP3006133B1 (ja)
JP (1) JP5541432B1 (ja)
CN (1) CN105246613B (ja)
RU (1) RU2617465C1 (ja)
WO (1) WO2014188599A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105499324A (zh) * 2016-01-13 2016-04-20 中石化石油工程技术服务有限公司 钢管口复圆装置及其使用方法
JP6791397B2 (ja) * 2018-09-14 2020-11-25 Ｊｆｅスチール株式会社 鋼管の製造方法及びプレス金型
WO2022009575A1 (ja) 2020-07-10 2022-01-13 Ｊｆｅスチール株式会社 鋼管の真円度予測モデルの生成方法、鋼管の真円度予測方法、鋼管の真円度制御方法、鋼管の製造方法、及び鋼管の真円度予測装置
WO2022009576A1 (ja) 2020-07-10 2022-01-13 Ｊｆｅスチール株式会社 鋼管の真円度予測方法、鋼管の真円度制御方法、鋼管の製造方法、鋼管の真円度予測モデルの生成方法、及び鋼管の真円度予測装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59183943A (ja) 1983-04-01 1984-10-19 Sumitomo Metal Ind Ltd 鋼管のメカニカル拡管方法
JP2001113316A (ja) 1999-10-15 2001-04-24 Kawasaki Steel Corp パイプのプレス成形方法及び装置
JP2012170977A (ja) * 2011-02-21 2012-09-10 Jfe Steel Corp 鋼管の製造方法

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JPS59209425A (ja) * 1983-05-12 1984-11-28 Nippon Kokan Kk <Nkk> Ｕｏｅ鋼管製造プロセス用ｕプレス工具
JPS61147930A (ja) 1984-12-19 1986-07-05 Sumitomo Metal Ind Ltd 鋼管の整形拡管方法
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JPH0394936A (ja) 1989-09-06 1991-04-19 Nkk Corp Ｕｏｅ鋼管の拡管方法
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JPS59183943A (ja) 1983-04-01 1984-10-19 Sumitomo Metal Ind Ltd 鋼管のメカニカル拡管方法
JP2001113316A (ja) 1999-10-15 2001-04-24 Kawasaki Steel Corp パイプのプレス成形方法及び装置
JP2012170977A (ja) * 2011-02-21 2012-09-10 Jfe Steel Corp 鋼管の製造方法

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Also Published As

Publication number Publication date
WO2014188599A1 (ja) 2014-11-27
CN105246613A (zh) 2016-01-13
RU2617465C1 (ru) 2017-04-25
JP5541432B1 (ja) 2014-07-09
JPWO2014188599A1 (ja) 2017-02-23
CN105246613B (zh) 2017-03-08
EP3006133A4 (en) 2016-06-29
EP3006133A1 (en) 2016-04-13

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