EP3006128A1 - Procédé de fabrication de tuyau en acier soudé - Google Patents

Procédé de fabrication de tuyau en acier soudé Download PDF

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Publication number
EP3006128A1
EP3006128A1 EP13885748.7A EP13885748A EP3006128A1 EP 3006128 A1 EP3006128 A1 EP 3006128A1 EP 13885748 A EP13885748 A EP 13885748A EP 3006128 A1 EP3006128 A1 EP 3006128A1
Authority
EP
European Patent Office
Prior art keywords
press forming
steel plate
forming
pipe
die
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.)
Granted
Application number
EP13885748.7A
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German (de)
English (en)
Other versions
EP3006128A4 (fr
EP3006128B1 (fr
Inventor
Masayuki Horie
Yukuya TAMURA
Toshihiro Miwa
Kouzi HORIGIWA
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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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP3006128A1 publication Critical patent/EP3006128A1/fr
Publication of EP3006128A4 publication Critical patent/EP3006128A4/fr
Application granted granted Critical
Publication of EP3006128B1 publication Critical patent/EP3006128B1/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
    • 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

Definitions

  • the present invention relates to a method of manufacturing a thick welded steel pipe having a large diameter used for a line pipe or the like, and more particularly, to a method of manufacturing an open pipe having high roundness by a press bending method for performing three-point bending press forming multiple times.
  • the above-described open pipe refers to a formed article of a state in which plate end portions (open seam edges) facing each other are not welded after a plate material as a material is formed into a cylindrical shape.
  • UOE steel pipe As the thick steel pipe having a large diameter used for a line pipe or the like, a so-called "UOE steel pipe” has been widely used.
  • the UOE steel pipe is formed so that a steel plate having a predetermined width, length, and thickness is press-formed into a U-shape and then is press-formed into an O-shape to obtain an open pipe, and thereafter, a steel pipe is obtained by performing butt welding of the open pipe, and the diameter thereof is expanded (the pipe is expanded) to improve the roundness.
  • the press forming of the steel plate into a U-shape and an O-shape requires a great pressure, and it is necessary to use a large-scale press machine.
  • a method of manufacturing a steel pipe using a press bending method has been put into practical use, for example.
  • a three-point bending press is performed multiple times while feeding the steel plate by a predetermined amount in the width direction to form the steel plate into a substantially circular open pipe, the butt welding is performed on an opening portion of the open pipe, and then, the steel pipe is obtained by correcting the shape.
  • Patent Literature 1 discloses a press-forming die in which a punch forming an upper die, a cradle having a fixed installation position to face the punch and becoming a bottom dead center of the punch, and the first and the second dies disposed to face each other on both right and left sides with the cradle interposed therebetween and capable of reciprocating in opposite directions are provided, and the cradle, the first die, and the second die constitute a lower die.
  • Patent Literature 2 discloses a technique in which a concave surface of a radius corresponding to an outer diameter is formed in an outer die in a predetermined length, a convex surface of a radius corresponding to an inner diameter is formed in an inner die in a predetermined length, the outer die and the inner die are brought into close-contact with each other, a corresponding portion for pressing is bent between both dies, the inner die is brought into close-contact with the outer die in the state of receiving the steel plate at a position projecting inward from an extended surface of the outer die by roller members installed on both outer sides of the outer die, and the vicinity of the corresponding portion for pressing is made to become a bent state, thereby accurately performing the bending.
  • Patent Literature 3 discloses a method of manufacturing a round steel pipe in which the steel plate is press-formed and bent, a portion of a groove is butted, welded and bonded to form an intermediate round steel pipe, and after the entire intermediate round steel pipe is heated, the surface of the intermediate pipe is allowed to pass between a plurality of forming rolls having a semicircular shape corresponding to a final radius and is subjected to hot-forming for adjusting the shape.
  • Patent Literature 1 a plate thickness decreases, because the steel plate is clamped by the punch and the cradle in the bottom dead center. For that reason, when the clamped range is local, the pipe thickness becomes uneven and there is a possibility that a predetermined dimension is not satisfied.
  • the problems of Patent Literature 1 are solved by clamping the entire bent range by the outer die and the inner die, but since appropriate inner die and outer die dimensions differ depending on a diameter and a thickness of the steel pipe, there is a need to prepare the dies of various dimensions, and frequency of the die replacement increases, and thus there is a problem of poor productivity.
  • Patent Literature 3 there is a need for a heating process for performing the hot shape correction, which leads to a significant increase in the manufacturing cost. Furthermore, in a case where a steel plate produced by thermo-mechanical treatment is used for the material, there is a risk of damage to strength, toughness, and weldability due to heating.
  • the present invention has been made in view of the above-described problems of the related art, and an object thereof is to provide a method of manufacturing a welded steel pipe capable of simply manufacturing an open pipe having a small amount of offset of a welded part by a press bending method.
  • a method of manufacturing a welded steel pipe including: performing three-point bending press forming on a raw material steel plate by a pair of dies disposed in a steel plate feeding direction at a predetermined gap, and a punch configured to press the steel plate between the pair of dies to form an open pipe; and welding the open pipe, wherein, when the open pipe is formed such that after performing first half press forming from one width end portion of the steel plate toward a width center (provided, leaving the width center unpressed), second half press forming is performed from a width end portion of an opposite side toward the width center (provided, leaving the width center unpressed), and the width center is finally subjected to final press forming, the steel pipe, supported on the dies of the steel plate width center side, is assumed to be a non-formed portion in a final pass of the second half press forming.
  • the final pass of the second half press forming satisfies the following Formula (1): ⁇ b ⁇ W ⁇ ⁇ b ⁇ L b + L n
  • the present invention it is possible to obtain an open pipe free from stepped portion (offset) of the butted part, without causing adverse effects on the quality such as reduction in the thickness of the steel plate due to clamping between the lower die and the upper die, without a decline in working efficiency due to replacement of the lower die, and without necessity to change the forming conditions in the press forming of the first and second halves. Furthermore, according to the present invention, there is no need for a hot shape correction, and then it is possible to provide a steel pipe while maintaining manufacturing properties at a manufacturing stage of the raw material steel plate.
  • Fig. 1 schematically illustrates a process of forming an open pipe before welding of the steel pipe, by a press bending method using a three-point bending press forming machine that has a pair of dies which is disposed in a steel plate feeding direction at a predetermined interval and supports the steel plate at two locations, and a punch which presses the portion of steel plate between the dies.
  • the steel plate with the bent end is used, but the same in the case of no bent end in the steel plate.
  • first half press forming the three-point bending press forming and the feeding of the steel plate are repeated multiple times (a times) toward position C from position A of Fig. 1 to form half of the steel plate into a substantially circular shape.
  • the steel plate central position C is not formed, and the first half press forming is completed.
  • this process is referred to as "first half press forming”.
  • the three-point bending press forming and the feeding are repeated multiple times (b times) toward position C from position B as the other end of the steel plate to form the remaining half into a substantially circular shape.
  • the forming conditions such as the feed length of the steel plate and the number of presses (number of passes) be the same as the first half press forming, in order to make the shape of the formed part the same as that of the first half press forming.
  • the steel plate central position C is not formed, either. This process is referred to as "second half press forming".
  • the steel plate after the second half press forming is formed in a C shape in which a flat portion remains in the width central part and the butted parts are greatly opened.
  • An amount of press-down (positional relation between the die and the punch) in the first half press forming and the second half press forming can be arbitrarily selected for each pass of the press forming to control the formed shape. In order to obtain the same formed shape in the first half press forming and the second half press forming, it is preferred that the amount of press-down be constant. However, when it is known that the end bending shape, the plate thickness, the plate strength and the like differ between the first half press bending side and the second half press bending side, or when an asymmetric shape is desired in consideration of the subsequent processes, the feed length of the steel plate, the number of presses, the amount of press-down and the like are changed for the first half press forming and the second half press forming. In that case, it is preferred that the changes at that location easily adjust the amount of press-down.
  • the feed length of the steel plate per each pass of the steel plate be equal to or less than the die gap. This is because when the feed length exceeds the die gap, the non-formed portion remains on the steel plate after forming, which results in a remarkable degradation of roundness of the open pipe and the product steel pipe.
  • Figs. 2(a) to 2(c) are schematic diagrams illustrating a final pass (a-th time) of the first half press forming.
  • the left die of Figs. 2(a) to 2(c) is in contact with the steel plate that is not yet formed.
  • the already-formed steel plate portion having a curvature comes to the other right die, and portion of the steel plate is located above the die. For that reason, when pressing down the steel plate by the punch, the already-formed side having the curvature moves downwards, and the press forming starts to be performed on the steel plate from the state in which the steel plate is tilted.
  • the forming area of the steel plate at the punch bottom dead center becomes asymmetrical with respect to the center of the upper die.
  • Figs. 3(a) to 4(c) are schematic diagrams illustrating the final pass (b-th time) of the second half press forming.
  • the formed shape greatly changes by the relative proportion between the die gap and the feed length of steel plate.
  • the feed length of the steel plate is relatively larger than the die gap
  • the right die in Figs. 3(a) to 3(c) comes into contact with the non-formed part on the center side in the width direction of the steel plate, but the already-formed steel plate portion having the curvature comes to the other left die, the steel pipe becomes located above the dies. That is, Figs. 3(a) to 4(c) shows a similar state to the above-described Figs. 2(a) to 2(c) though the right and left sides are reversed.
  • the shape of the right portion of the steel plate is different from the shape of the left portion of the steel plate of Figs. 3(a) to 3(c) .
  • the set position of the steel plate is shifted even at the same guide position as that of the first half press forming as illustrated in Figs. 3(a) to 3(c) , which leads to differences in formed shape.
  • Fig. 5 schematically illustrates a situation of feeding the steel plate for the final pass of the second half press forming, in a case where the same feed length of the steel plate as Figs. 4(a) to 4(c) is relatively smaller than the die gap.
  • the steel plate In order to feed the steel plate to the position of the final pass, the steel plate is fed toward a steel plate width end portion side (a left side of Fig. 5 ).
  • the center of gravity of the steel plate exceeds the right die of Fig. 5 of the width center side of the steel plate, and then the steel plate width end portion side of the left side moves downwards and comes into contact with the left die.
  • the position where the left end portion of the steel plate starts to move downwards and the position coming into contact with the die depend on inertia force when feeding the steel plate and frictional resistance between the die and the steel plate due to differences in the surface conditions of the steel plate, which causes the variation in the range of press forming.
  • the inventors examined the press conditions for preventing the steel plate from becoming the state illustrated in Figs. 4(a) to 4(c) in the second half press forming.
  • Fig. 6 illustrates a positional relation among the steel plate, the die, and the punch when disposing the steel plate in a state prior to the final pass (b-th time) of the second half press forming.
  • symbols L b , L n , W, ⁇ b , and ⁇ b illustrated in Fig. 6 are defined as follows.
  • the bending moment required for the plastic deformation is a value M f which depends on the thickness of the forming target material and the deformation resistance.
  • the force acting on the forming target material from the die is reaction force P 1 and P 4 received from the dies, and moment obtained by multiplying the reaction force by distances (L 1 , L 4 , respectively) to the deformation point (the end portion of the forming range) acts.
  • P 1 ⁇ L 1 , and P 4 ⁇ L 4 exceeds M f , the deformation starts.
  • the die gap of three-point bending press forming has a lower limit value defined from the capacity of the press machine, the dimension of the forming target material, and the strength.
  • the thick steel plate subjected to the above-described end bending is subjected to three-point bending press forming by a three-point press machine having the capacity of 100 MN while variously changing the steel plate feed length and the die gap, is formed into an open pipe having an outer diameter of 914.4 mm, a length of 12192 mm, and a pipe thickness of 31.8 mm, and an amount of offset of the butted part defined in Fig. 8 is measured.
  • a punch outer peripheral surface of the three-point bending press forming is R 315 mm
  • a die outer peripheral surface is R 100 mm.
  • Table 1 indicates measurement results of the amount of offset of the butted part in conjunction with the press conditions.
  • the press conditions the number of passes of the second half press forming, a bend angle ⁇ b per pass, a forming range L b in the final pass of the second half press forming, a forming range L n in the final pass forming, a punch shift ratio ⁇ b in the final pass of the second half press forming, a die shift ratio ⁇ b , and a die gap W are indicated.
  • the bend angle per pass, the forming range, the punch shift ratio, and the die shift ratio are the same as those of the final pass of the second half press forming.
  • the number of presses and the conditions of the first half press forming are the same as those of the second half press forming.
  • the thick steel plate having strength of API X80 Grade, an outer diameter of 914.4 mm, a length of 12192 mm, and a plate thickness of 31.8 mm is subjected to three-point bending press forming into an open pipe for a welded steel pipe.
  • the number of passes of the second half press forming is changed to five times and nine times, the die gap is changed to 360 mm, 380 mm, 620 mm, and 640 mm, and the shift amounts ⁇ b and ⁇ b of the final pass in the second half press forming in each of the above-described conditions are variously changed.
  • the bend angle per pass and the forming range of other passes of the second half press forming are the same as those of the final pass, and the punch shift ratio and the die shift ratio are 0.5. Furthermore, the number of presses and the conditions of the first half press forming are the same as those of the second half press forming.
  • the open pipe for a welded steel pipe having strength of API X80 Grade, an outer diameter of 914.4 mm, a length of 12192 mm, and a thickness of 31.8 mm is manufactured.
  • the number of passes of the second half press forming is set to nine times, the die gap is set to 360 mm and 380 mm, and a forming range L b of the final pass of the second half press forming and a forming range L n of the final pass forming are variously changed as indicated in Table 3.
  • a bend angle ⁇ b in the final pass of the second half press forming and a bend angle ⁇ n of the final press forming are also changed as indicated in Table 3.
  • the bend angle per pass, and the forming range, the punch shift ratio, and the die shift ratio of other passes of the second half press forming are the same as those of the final pass of the second half press forming, and the number of presses and the conditions of the first half press forming are the same as those of the second half press forming.
  • the amount of offset of the welded part of the open pipe can be reduced to a value less than the correctable range, regardless of the magnitudes of the forming ranges L b and L n .
  • the amount of offset is suppressed to the correctable range, by increasing the forming range L n of the final press forming.
  • Table 4 illustrates strength grade and dimension of a product, a radius of a tool used as an end bending condition, a machining width (range of end bending), a bend angle, and the press conditions.
  • the punch shift ratio and the die shift ratio are set to 0.5.
  • the band angle per pass, the forming range, the punch shift ratio, and the die shift ratio of other passes of the second half press forming are the same as those of the final pass of the second half press forming, and the number of presses and the conditions of the first half press forming are the same as those of the second half press forming.
EP13885748.7A 2013-05-29 2013-05-29 Procédé de fabrication de tuyau en acier soudé Active EP3006128B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/064852 WO2014192091A1 (fr) 2013-05-29 2013-05-29 Procédé de fabrication de tuyau en acier soudé

Publications (3)

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EP3006128A1 true EP3006128A1 (fr) 2016-04-13
EP3006128A4 EP3006128A4 (fr) 2016-06-29
EP3006128B1 EP3006128B1 (fr) 2018-10-24

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EP (1) EP3006128B1 (fr)
JP (1) JP6070967B2 (fr)
CN (1) CN105246608B (fr)
RU (1) RU2621747C1 (fr)
WO (1) WO2014192091A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11148218B2 (en) 2016-03-10 2021-10-19 Hitachi Zosen Corporation Method for welding steel pipe in steel pipe structure and joint
WO2022117287A1 (fr) * 2020-12-01 2022-06-09 Sms Group Gmbh Procédé de production de tuyaux à soudure ouverte

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DE102015210259B4 (de) * 2015-06-03 2016-12-15 Sms Group Gmbh Verfahren zum Herstellen von Schlitzrohren aus Blechtafeln
JP6566231B1 (ja) * 2018-03-30 2019-08-28 Ｊｆｅスチール株式会社 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
RU2769596C1 (ru) * 2018-09-14 2022-04-04 ДжФЕ СТИЛ КОРПОРЕЙШН Способ изготовления стальной трубы и матрица
CN109500118B (zh) * 2018-12-26 2023-06-09 重庆龙煜精密铜管有限公司 一种防跳车游动芯头及铜管缩径拉拔防跳车方法
CN112024723A (zh) * 2020-08-21 2020-12-04 江苏恒高电气制造有限公司 一种gil小角度壳体弯曲装置
CN112659563A (zh) * 2020-11-27 2021-04-16 常州安一智能科技有限公司 圆桶滤网热压拼接设备及其工作方法
CN114570784B (zh) * 2021-12-24 2022-12-06 钢一控股集团有限公司 一种大口径不锈钢管的成型装置

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
US11148218B2 (en) 2016-03-10 2021-10-19 Hitachi Zosen Corporation Method for welding steel pipe in steel pipe structure and joint
WO2022117287A1 (fr) * 2020-12-01 2022-06-09 Sms Group Gmbh Procédé de production de tuyaux à soudure ouverte

Also Published As

Publication number Publication date
EP3006128A4 (fr) 2016-06-29
JPWO2014192091A1 (ja) 2017-02-23
CN105246608A (zh) 2016-01-13
RU2621747C1 (ru) 2017-06-07
JP6070967B2 (ja) 2017-02-01
CN105246608B (zh) 2018-01-02
WO2014192091A1 (fr) 2014-12-04
EP3006128B1 (fr) 2018-10-24

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