EP2883627B1 - Verfahren zur herstellung eines stahlrohrs - Google Patents

Verfahren zur herstellung eines stahlrohrs Download PDF

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Publication number
EP2883627B1
EP2883627B1 EP12882736.7A EP12882736A EP2883627B1 EP 2883627 B1 EP2883627 B1 EP 2883627B1 EP 12882736 A EP12882736 A EP 12882736A EP 2883627 B1 EP2883627 B1 EP 2883627B1
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EP
European Patent Office
Prior art keywords
pipe
steel pipe
expander
point bending
steel
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
EP12882736.7A
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English (en)
French (fr)
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EP2883627A4 (de
EP2883627A1 (de
Inventor
Masayuki Horie
Isamu YASUHARA
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
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JFE Steel Corp
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Publication of EP2883627A1 publication Critical patent/EP2883627A1/de
Publication of EP2883627A4 publication Critical patent/EP2883627A4/de
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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
    • 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
    • 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

  • This invention relates to a method of producing a large-diameter and thick-walled steel pipe used in line pipe and the like.
  • UOE steel pipes are widely used as the large-diameter and thick-walled steel pipe used in the line pipe.
  • a so-called UOE steel pipe produced by press bending a steel plate as a material having predetermined width, length and thickness into a U-shaped form, further press forming into a O-shaped form, welding a seam to form a steel pipe, and thereafter performing pipe expanding for increasing a diameter of the steel pipe to enhance a roundness.
  • a significant press force is required at steps of press-forming the steel plate into U-shaped and O-shaped forms, so that it is necessary to use a large-scale press machine.
  • a method of producing the large-diameter and thick-walled steel pipe by reducing the press force For example, a method of bending a widthwise end portion of a steel plate (edge bending) and performing plural times of three-point bending press to shape the steel plate into substantially a cylindrical form, welding a seam to form a steel pipe, and then inserting a pipe expander into the inside of the steel pipe to perform pipe expanding is put into practical use.
  • the pipe expander is provided with a plurality of expander tools each having a curved surface of a divided circular arc, and has an action of arranging the form of the steel pipe to enhance the roundness by pushing the curved surface to the inner face of the steel pipe to enlarge the pipe (pipe expanding).
  • Patent Document 1 discloses a technique wherein a steel plate are subjected to press bending with a die 4 times and further seams thereof are welded to form a steel pipe and then hot roll forming is applied to the steel pipe by heating to arrange the form thereof.
  • JP2001 113316 A shows a tube forming method by consecutive 3-point bending operations.
  • EP 1 541 252 A1 discloses a UOE steel pipe with excellent crash resistance, and method of manufacturing the UOE steel pipe, wherein said UOE steel pipe is characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.
  • Patent Document 1 JP-A-2005-324255
  • Patent Document 1 requires the heating of the steel pipe, so that it is necessary to use a heating apparatus, which brings about the increase of the production cost. Also, there is a problem that excellent properties such as strength, toughness, weldability and the like provided to the raw steel plate by taking a technique of accelerated cooling or the like are deteriorated by heating the steel pipe.
  • the present invention is made in view of the above problems inherent to the conventional technique and is to propose a method of producing a steel pipe wherein the heating of the steel pipe is not required in the production of the large-diameter and thick-walled steel pipe by performing plural times of three-point bending press and a good roundness can be attained even if the number of times of three-point bending press is decreased.
  • the number of times of three-point bending press or the center to center spacing of dies thereof is usually set so as not to generate a gap in a deformation area by bending press in order to enhance the roundness of the steel pipe. Therefore, if the number of times of three-point bending press is decreased for shortening the production time of the steel pipe, the center to center spacing of dies is increased, and hence the deformation area bent by three-point bending press is arc-like, while non-deformation area is flat, so that the roundness of the resulting steel pipe becomes low.
  • the inventors have turned attention to a deformation amount applied to the steel pipe in the pipe expanding and made further studies on the method for enhancing the roundness of the steel pipe produced by performing plural times of three-point bending press. As a result, it has been found out that when the steel pipe is expanded, there is a tendency that the deformation amount (expanding amount) becomes large at sites of contacting plural expander tools of the pipe expander inserted with the inside of the steel pipe, while the deformation amount becomes small at sites not contacting the expansion tool therewith.
  • the method of producing a steel pipe according to the present invention is defined by the combination of features of claim 1. That is, the present invention proposes a method of producing a steel pipe by shaping a steel plate subjected to edge bending into a cylindrical form through plural times of three-point bending press in widthwise direction and welding a seam thereof to form a non-expanded pipe, the non-expanded pipe comprising arc-like deformation areas and flat non-deformation areas, inserting a pipe expander provided with plural expander tools into an inside of the non-expanded pipe to perform pipe expanding, characterized in that the expander tools are pushed onto all sites of non-deformation areas in three-point bending press to perform pipe expanding, wherein the non-deformation areas are preferentially deformed while suppressing deformation of the deformation areas.
  • the number of times of the three-point press bending is (aN - 1) wherein a is an integer of 1, 2 or the like when the number of the expander tools is N.
  • the number of times of three-point bending press can be decreased without requiring the heating of the steel pipe, so that it is possible to produce a steel pipe having an excellent roundness in a high productivity without damaging excellent properties such as strength, toughness, weldability and the like provided during the production process of the raw steel plate.
  • width L widthwise end portions of a steel plate 3 having a plate width W illustrated in FIG. 1(a) are curved to form bent portions (hereinafter referred to as "edge bending")
  • one half of the plate divided by a widthwise central line CL illustrated in FIG. 1(b) is subjected to plural times of three-point bending press 4 from one widthwise end of the steel plate 3 toward widthwise center thereof (provided that a portion of the widthwise central line CL is left unpressed), whereby one half of the steel plate 3 is shaped into substantially a semicircular form.
  • the steel plate 3 is placed on two lower dies 5a, 5b arranged at a given distance and an arc-like curved surface of an upper forming tool 6 is pressed onto the steel plate 3 to perform bending work.
  • the distance between positions of pressing the upper forming tool in the three-point bending press 4 (which may be called as "feed pitch P" hereinafter) is equal distance.
  • the three-point bending press cannot be used in the edge bending at both widthwise end portions of the steel plate 3.
  • the three-point bending press cannot be performed because the end portion of the sheet plate 3 does not touch one of the lower dies.
  • the edge bending is usually performed by pressing with a pair of upper and lower dies.
  • both the widthwise end portions of the steel plate 3 are butted by performing three-point bending press 4 at the position of the widthwise central line CL and thereafter the seam is welded to form a non-expanded pipe 1 illustrated in FIG. 1(e) .
  • non-expanded pipe 1 there are arc-like deformation areas 8 (solid line portions) and flat non-deformation areas 9 (dotted line portions) as illustrated by section in FIG. 3 .
  • the deformation area 8 is a site subjected to deformation by a series of the above three-point bending press illustrated in FIG. 1 (or a site subjected to deformation by pressing the arc-like curved surface of the upper forming tool 6), and the non-deformation area 9 is a site not deformed by the three-point bending press.
  • a pipe expander provided with a plurality of expander tools having curved surfaces of plural divided arcs is inserted into the inside of the non-expanded pipe and enlarged in radial direction to expand the non-expanded pipe to thereby form a steel pipe.
  • the non-expanded pipe has the arc-like deformation areas and the flat non-deformation areas. Therefore, it is necessary to deform the flat non-deformation area into an arc form for enhancing the roundness of the steel pipe.
  • the non-expanded pipe cannot be expanded in the circumferential direction uniformly.
  • the pipe expanding when the pipe expanding is performed by inserting the pipe expander provided with the plural expander tools into the inside of the non-expanded pipe, the arc-like curved surfaces of the expander tools are pushed onto all of the non-deformation areas to expand the non-expanded pipe.
  • the non-deformation areas are deformed while suppressing the deformation of the deformation area not contacting with the expander tool, whereby the non-deformation areas can form a continuous arc together with the deformation areas previously shaped into an arc form and hence the roundness of the steel pipe can be enhanced.
  • the number of the non-deformation areas in the non-expanded pipe is the same as the number of the expander tools in the pipe expander inserted into the inside of the non-expanded pipe. That is, when the number of the expander tools is N, it is preferable to perform the three-point bending press so as to render the number of the non-deformation areas in the non-expanded pipe into N sites. In this case, one welded seam and (N-1) deformation areas are arranged in gaps of N expander tools. Also, the number of times of three-point bending press may be (N-1).
  • FIG. 3 illustrates a case that the number of the non-deformation areas 9 is coincident with the number of the expander tools 2, namely, a view showing an example of expanding the non-expanded pipe 1 subjected to three-point bending press of 11 times with twelve expander tools 2.
  • the number of times of three-point bending press 4 subjected to the raw steel plate for providing twelve non-deformation areas 9 may be 5 times of three-point bending press 4 subjected to one half of the plate divided by widthwise central line CL illustrated in FIG. 1(b) , 5 times of three-point bending press 4 subjected to the other half of the plate divided by widthwise central line CL in FIG.
  • the number of the non-deformation areas in the non-expanded pipe may be an integral multiple of the number of expander tools in the pipe expander inserted into the inside of the non-expanded pipe such as 2 times, 3 times or the like.
  • FIG. 4 illustrates a case that pipe expanding is performed by inserting a pipe expander with ten expander tools 2 into a non-expanded pipe 1 having twenty non-deformation areas 9 formed by three-point bending press of 19 times, namely, an example that the number of the non-deformation areas 9 is 2 times of the number of the expander tools 2.
  • each of the expander tools can be pushed onto all of the non-deformation areas in such a manner that one expander tool is pushed onto the two adjacent non-deformation areas.
  • the number of times of three-point bending press required for forming 2N sites of non-deformation areas corresponding to 2 times of the number of expander tools N may be (2N - 1).
  • the number of the expander tools in the present invention is N
  • the number of times of three-point bending press is (aN - 1) (wherein a is an arbitrary integer such as 1, 2, or the like).
  • the feed pitch of the steel plate in the three-point bending press is at equal distance, so that the width of the non-deformation area is same as the feed pitch in the press.
  • the number of expander tools is N
  • the number of times of three-point bending press required for the production of large-diameter and thick-walled steel pipes can be reduced to (aN - 1) (wherein a is an integer of 1, 2 or the like), so that it is possible to largely improve the productivity of the steel pipes.
  • all steps from edge bending of the steel plate through three-point bending press to pipe expanding can be conducted as cold working, so that the steel pipes can be produced without damaging excellent properties inherent to the raw steel plate.
  • the effect of the present invention is remarkable in the production of thick-walled steel pipes having a thickness of 25.4 ⁇ 50.8 mm.
  • a pipe expanding ratio 100 x (diameter after pipe expanding - diameter before pipe expanding)/ (diameter before pipe expanding) of 1% to produce a steel pipe.
  • conditions of three-point bending press other than the above condition and conditions of pipe expanding are varied as shown in Tables 1 and 2.
  • the raw steel plate is shaped into substantially a cylindrical form by subjecting to three-point bending press of 5 times with a starting point at a position of 1492 mm from a widthwise central line toward one side at a feed pitch P P in a direction of widthwise central line of 298 mm, then subjecting to three-point bending press of 5 times with a starting point at a position of 1492 mm from a widthwise central line toward the other side at a feed pitch P P in a direction of widthwise central line of 298 mm, and finally subjecting to three-point bending press of 1 time at a position of widthwise central line (11 times in total), and thereafter widthwise ends of the steel plate are welded to each other to form a non-expanded pipe having 12 non-deformation areas.
  • a bent angle after load removal in three-point bending press is 29.6°.
  • a pipe expander provided with 12 expander tools in a circumferential direction is inserted into the inside of the non-expanded pipe and the expander tool is pushed onto the respective non-deformation area and the welded portion is disposed in the gap between the expander tools to perform pipe expanding as illustrated in FIG. 1 , whereby a steel pipe is produced.
  • a face of the expander tool contacting with an inner face of the non-expanded pipe is an arc having a radius of curvature of 580 mm and an angle of 27.7° (the same applies hereafter when the number of expander tools is 12).
  • a steel pipe B (Invention Example) is an example of producing a steel pipe by manufacturing a non-expanded pipe having 10 non-deformation areas under conditions shown in Table 1, inserting a pipe expander provided with 10 expander tools in a circumferential direction into the inside of the non-expanded pipe, pushing the expander tool onto the respective non-deformation area and disposing the welded portion of the non-expanded pipe in the gap between the expander tools to perform pipe expanding as the steel pipe A.
  • an opening angle (circular arc angle) of an arc of the expander tool contacting with the inner face of the non-expanded pipe and having a radius of curvature of 580 mm is 33.4° (the same applies hereafter when the number of expander tools is 10).
  • a steel pipe C (Invention Example) is an example of producing a steel pipe by performing three-point bending press of 19 times to manufacture a non-expanded pipe having 20 non-deformation areas as shown in Table 1, inserting a pipe expander provided with 10 expander tools in a circumferential direction into the inside of the non-expanded pipe, and pushing one expander tool onto the two non-deformation areas as shown in Table 2 to perform pipe expanding.
  • a steel pipe D (Comparative Example) is an example of producing a steel pipe by inserting a pipe expander provided with 12 expander tools as in the steel pipe A into an inside of a non-expanded pipe produced under the same conditions as in the steel pipe A and having 12 non-deformation areas and pushing each of the expander tools onto the deformation area as as to place the non-deformation area in the gap between the expander tools as illustrated in FIG. 5 to perform pipe expanding.
  • a steel pipe E (Comparative Example) is an example of producing a steel pipe by inserting the same pipe expander provided with 10 expander tools as in the steel pipe B into an inside of a non-expanded pipe produced under the same conditions as in the steel pipe B and having 10 non-deformation areas and pushing each of the expander tools onto the deformation area as as to place the non-deformation area in the gap between the expander tools as illustrated in FIG. 5 to perform pipe expanding.
  • a steel pipe F (Comparative Example) and a steel pipe G (Comparative Example) are examples of producing a steel pipe by manufacturing a non-expanded pipe having 8 or 10 non-deformation areas under conditions shown in Table 1, inserting a pipe expander provided with expander tools different from the number of non-deformation areas into the inside of the non-expanded pipe as shown in Table 2 and then performing pipe expanding at a state of not contacting the expander tool with a part of the non-deformation areas.
  • FIG. 6 shows a case of the steel pipe G.
  • the roundness and productivity of the steel pipe are measured the roundness and productivity of the steel pipe to obtain results also shown in Table 2.
  • the roundness is evaluated by measuring a difference m between an outer surface of a steel pipe 11 and virtual true circle 10 as illustrated in FIG. 7 with a dial gauge at a distance of 150 mm in a circumferential direction to determine a maximum value m max of the difference m in each steel pipe and calculating a ratio of m max of each steel pipe to m max of the steel pipe D (hereinafter referred to as "difference index (ratio) ").
  • the difference index of the steel pipe D is 1.00, and as the difference m becomes near to zero, the steel pipe becomes near to true circle.
  • the difference index in the steel pipes A ⁇ C of Invention Examples is 0.62 ⁇ 0.66, while the difference index in the steel pipes D ⁇ G of Comparative Examples is 0.93 ⁇ 1.14, so that the roundness is excellent in the steel pipes of Invention Examples as compared to the steel pipes of Comparative Examples.
  • the roundness of the steel pipes A and B having the small number of times of three-point bending press in Invention Examples is slightly poor as compared with that of the steel pipe C having a large number of times of three-point bending press, but the pressing time is shortened by not less than 30% as shown in Table 1, from which it can be seen that the steel pipes having a good roundness can be produced in a high productivity by applying the present invention.
  • the production method of steel pipes according to the present invention is not limited to the production of large-diameter and thick-walled steel pipes, and can be applied to all of methods of producing steel pipes by performing three-point bending press.

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

Claims (1)

  1. Eine Methode zum Herstellen eines Stahlrohrs durch Formen einer Stahlplatte, die einer Kantenbiegung in eine zylindrische Form, welche durch eine Vielzahl von Drei-Punkt-Biegepressen in Breitenrichtung und Schweißen einer Naht davon, unterworfen ist, um ein nicht expandiertes Rohr (11) zu bilden, wobei ein Rohrexpander mit mehreren Expandierwerkzeugen(2) in eine Innenseite des nicht expandierten Rohrs (1) eingebracht wird um eine Rohrexpandierung durchzuführen, die dadurch gekennzeichnet ist, dass die Expandierwerkzeuge (2) auf alle Seiten der nicht verformbaren Bereiche (9) im Drei-Punkt-Biegepressen gedrückt werden um eine Rohraufweitung durchzuführen,
    dadurch gekennzeichnet, dass
    die Anzahl des Drei-Punkt-Biegepressen (aN - 1) ist, wobei a eine ganze Zahl von 1,2 oder dergleichen ist, wenn die Anzahl der Expandierwerkzeuge N ist,
    wobei das nicht expandierte Rohr (1) bogenförmige Verformungsbereiche (8) und flache, nicht verformbare Bereiche (9) aufweist, und
    die nicht verformbaren Bereiche (9) verformt werden, während die Verformung der Verformungsbereiche (8) unterdrückt wird.
EP12882736.7A 2012-08-09 2012-08-09 Verfahren zur herstellung eines stahlrohrs Active EP2883627B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/070321 WO2014024287A1 (ja) 2012-08-09 2012-08-09 鋼管の製造方法

Publications (3)

Publication Number Publication Date
EP2883627A1 EP2883627A1 (de) 2015-06-17
EP2883627A4 EP2883627A4 (de) 2015-08-26
EP2883627B1 true EP2883627B1 (de) 2017-04-12

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EP12882736.7A Active EP2883627B1 (de) 2012-08-09 2012-08-09 Verfahren zur herstellung eines stahlrohrs

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EP (1) EP2883627B1 (de)
KR (1) KR101712885B1 (de)
CN (1) CN104271279B (de)
CA (1) CA2880661C (de)
IN (1) IN2015DN00990A (de)
RU (1) RU2601844C2 (de)
WO (1) WO2014024287A1 (de)

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JP6112740B2 (ja) * 2014-03-31 2017-04-12 Ｊｆｅスチール株式会社 ３点曲げプレス成形による鋼管の成形方法および成形装置
DE102015210259B4 (de) 2015-06-03 2016-12-15 Sms Group Gmbh Verfahren zum Herstellen von Schlitzrohren aus Blechtafeln
JP7137829B2 (ja) * 2018-07-05 2022-09-15 ナカジマ鋼管株式会社 丸形鋼管の製造方法、丸形鋼管製造設備
KR102285685B1 (ko) * 2019-07-14 2021-08-03 방만혁 복합관용 확관 장치 및 방법
CN111195658B (zh) * 2020-01-08 2021-10-08 河北金奥精工技术有限公司 一种异形摇臂轴无缝钢管及其成型方法
CN112845662A (zh) * 2021-02-01 2021-05-28 江苏天南铝材锻造有限公司 一种椭圆环形高强度铝制电力金具及弯管装置及工艺

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Publication number Publication date
WO2014024287A1 (ja) 2014-02-13
CN104271279A (zh) 2015-01-07
IN2015DN00990A (de) 2015-06-12
RU2601844C2 (ru) 2016-11-10
CA2880661C (en) 2018-05-22
EP2883627A4 (de) 2015-08-26
KR20150020694A (ko) 2015-02-26
CN104271279B (zh) 2016-12-07
KR101712885B1 (ko) 2017-03-07
RU2015108026A (ru) 2016-09-27
EP2883627A1 (de) 2015-06-17
CA2880661A1 (en) 2014-02-13

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