EP3006129A1 - Verfahren zum pressformen eines stahlrohrs und verfahren zur herstellung eines stahlrohrs - Google Patents

Verfahren zum pressformen eines stahlrohrs und verfahren zur herstellung eines stahlrohrs Download PDF

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Publication number
EP3006129A1
EP3006129A1 EP13885877.4A EP13885877A EP3006129A1 EP 3006129 A1 EP3006129 A1 EP 3006129A1 EP 13885877 A EP13885877 A EP 13885877A EP 3006129 A1 EP3006129 A1 EP 3006129A1
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EP
European Patent Office
Prior art keywords
pipe
steel plate
seam
press
forming
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
EP13885877.4A
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English (en)
French (fr)
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EP3006129B1 (de
EP3006129A4 (de
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
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JFE Steel Corp
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
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Publication of EP3006129A1 publication Critical patent/EP3006129A1/de
Publication of EP3006129A4 publication Critical patent/EP3006129A4/de
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Publication of EP3006129B1 publication Critical patent/EP3006129B1/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
    • 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
    • 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
    • B21D51/00—Making hollow objects

Definitions

  • the present invention relates to a method of press-forming a steel pipe having a heavy wall thickness and a method of manufacturing a steel pipe by press bending.
  • This forming method is for forming a steel plate having a predetermined width and a predetermined length into a steel pipe having a length direction thereof set as a pipe axis direction.
  • bending is applied to width edge portions of the steel plate (hereinafter referred to as "edge crimping") and, subsequently, bending is applied to the steel plate a plurality of times in the width direction of the steel plate, thereby forming the steel plate into a cylinder.
  • a main forming step which follows the edge crimping, as shown in Fig. 3 , two dies 1a, 1b are adjusted to have a predetermined distance therebetween, a steel plate S is placed on the dies 1a, 1b, a punch leading end portion 22 which is a leading end portion of a punch 2 of the upper die is pressed down to a position between two dies la, 1b, thereby applying bending deformation to the steel plate S. Next, the steel plate S is moved by a predetermined length in the width direction, and the upper die is pressed again. This pressing operation is repeated a plurality of times.
  • the steel plate is sequentially formed toward a center portion of the steel plate in the width direction (C in the drawing) from an edge portion of the steel plate on one side in the width direction (A in the drawing) thus forming the steel plate S from the edge portion of the steel plate on one side to a position immediately in front of the center portion of the steel plate in the width direction (first half of the step).
  • the steel plate S is sequentially formed from an edge portion of the steel plate on the other side opposite to one side in the width direction (B in the drawing), thereby forming the steel plate S from the edge portion of the steel plate on the other side to the center portion of the steel plate in the width direction (C in the drawing) (second half of the step).
  • the open seam pipe is a pipe body in a state where the plate material is formed into a cylindrical shape, and open seam edges which face each other in an opposed manner are not welded to each other.
  • a dotted line indicates a position of the steel plate S in a state where the punch 2 is not brought into contact with the steel plate S.
  • table rollers not shown in the drawing are arranged on left and right sides of the dies 1a, 1b. The table rollers can support the steel plate S at a point B or a point C as indicated by a dotted line in a left upper view in Fig. 3 , for example, and also can convey the steel plate S in the left and right directions in the drawing.
  • Fig. 4 is a schematic view of an open seam pipe.
  • the open seam pipe 3 is a pipe in a state where a plate material used as a raw material is formed into a cylindrical shape, and open seam edges 31a, 31b which face each other in an opposed manner are not welded to each other.
  • a gap g between the open seam edges which face each other in an opposed manner is a seam gap.
  • the pipe axis direction L of the open seam pipe 3 is same as the longitudinal direction of a punch.
  • the open seam pipe is conveyed in a longitudinal direction of the steel pipe (the direction perpendicular to a surface of paper on which Fig. 3 is drawn) so that the open seam pipe is transferred to a next step.
  • the seam gap g of the open seam pipe 3 is required to have a width larger than a thickness of a punch beam 21 which supports the punch leading end portion 22 of the upper die.
  • the open seam pipe 3 is constrained by a pressing-down device such that the seam gap g of the open seam pipe 3 is closed.
  • the open seam edges which are made to butt each other are welded to each other by a welder in such a state thus manufacturing a straight seam welded steel pipe.
  • a cylindrical shape of the welded steel pipe is modified by applying diameter expanding forming or a diameter shrinking forming to the welded steel pipe when necessary.
  • Adjustment and setting of such press conditions can be performed using a press die provided with a mechanism for adjusting a gap between dies of a lower die disclosed in patent literature 1.
  • a constraining force of the pressing-down device has an upper limit. Accordingly, there is a case that it is impossible to make open seam edges butt each other by constraining an open seam pipe having an amount of seam gap equal to or more than a fixed amount determined corresponding to a size of a steel pipe. As a result, there is a possibility that the open seam edges which are made to butt each other cannot be also welded to each other.
  • An amount of seam gap of an open seam pipe is adjusted by gradually increasing a punch pressing-down amount in the final press.
  • the punch pressing-down amount in the final press is increased, the amount of seam gap is decreased.
  • the punch pressing-down amount in the final press is decreased, the amount of seam gap is increased.
  • a yield strength of a steel plate also influences the seam gap. This is because when bending deformation is applied to the steel plate, a spring back amount after bending deformation is generated differs depending on the yield strength of the steel plate. For example, to take the case where press forming of a final pass is performed under the same press condition and, thereafter, a press load is completely removed as an example, a seam gap becomes small when the yield strength of the steel plate S is low, and the seam gap becomes large when the yield strength of the steel plate S is high.
  • a bent shape of the steel plate can be adjusted by adjusting a distance between dies of a lower die.
  • a shape of a steel pipe is measured after the steel pipe is formed from a steel plate in a first step and, thereafter, modification forming is performed in a second step by adjusting the distance between the dies of the lower die.
  • the bent shape of the steel pipe is measured in a state where a load is removed after forming in the first step is finished, that is, in a state where a spring back occurs and, thereafter, modification forming in the second step is performed by adjusting a press condition such as a pressing-down amount, a load, a distance between the dies of the lower die or the like in accordance with a result of measurement. Accordingly, in resetting the distance between the dies of the lower die, it is necessary to ensure a time for such resetting.
  • the gist of the present invention is as follows.
  • pressing is performed under a condition set in advance and hence, a press material having a small variation in a seam gap can be acquired whereby it is unnecessary to perform modification forming or to set and adjust a gap between dies of a lower die thus remarkably enhancing productivity.
  • API standards are the general standards for line pipes where straight seam welded steel pipes are mainly used. According to the API standards, a range from an upper limit to a lower limit of an yield strength of a welded steel pipe of grade X80 is 138 MPa.
  • a steel plate used as a raw material of a welded steel pipe also has a yield strength which substantially falls in the same range as that of the welded steel pipe. Particularly, in manufacturing a steel pipe having high yield strength, a steel plate which becomes a raw material of the welded steel pipe is manufactured by a TMCP method. Accordingly, an yield strength of the steel plate is also liable to vary because of a variation in chemical components condition, a rolling condition and a cooling condition.
  • edge crimping is performed as shown in Fig. 5 .
  • symbol 41 indicates an edge crimping lower die
  • symbol 42 indicates an edge crimping upper die.
  • Edge crimping is performed such that a crimp edge angle j ( Fig. 5B ) becomes 28 degrees at the time of applying a press load within a range h ( Fig. 5A ) having a width of 240 mm at an edge portion of a steel plate in the width direction.
  • a bent angle k ( Fig. 5C ) of an edge portion of the steel plate in the width direction after removing the press load is 23 degrees.
  • bending is applied to the steel plate sequentially 11 times in the steel plate width direction from edge portions of the steel plate in the width direction by a punch 2 (upper die) where a radius R of the punch leading end portion 22 shown in Fig. 6A is 415 mm.
  • the punch 2 (upper die) is constituted of a punch beam 21 and a punch leading end portion 22, and a lower die is constituted of dies 1a, 1b.
  • An entire bent angle of the steel plate excluding a seam gap of edge crimping (f in Fig.
  • a range "a" shown in Fig. 6A indicates a preceding-time bending range
  • a range "b” shown in Fig. 6A indicates a this-time bending range
  • 6A indicates a next-time and succeeding bending ranges.
  • the adjustment of a bending amount is performed in general such that a moving amount of the punch 2 is directly controlled by a press device.
  • forming is performed by setting an amount that the punch 2 is lowered from a state where the punch leading end portion 22 is brought into contact with an upper surface position of the steel plate (hereinafter, a lowering amount of the punch 2 from a reference point being referred to as a pressing-down amount and the upper surface position of the steel plate being taken as a reference unless otherwise specified) to a fixed value.
  • Fig. 2 shows the relationship between the yield strength difference which is the difference in yield strength of a steel plate with respect to 640 MPa which is a reference value of yield strength of the steel plate and a seam gap in a state where a load is removed after pressing is finished.
  • Fig. 1 shows the relationship between the yield strength difference and a seam gap in a state where a load is removed after pressing when bending in an intermediate step is performed by a conventional forming method and a pressing-down amount in the final forming pass (eleventh pass) is changed.
  • Fig. 1 as a reference, a result of the prior art shown in Fig. 2 (graph b) is also described.
  • a graph c indicates the present invention example where open seam edges are brought into contact with the punch beam 21 of the upper die and, thereafter, the steel plate is further pressed down by 9 mm to ensure the same deformation amount in the final forming pass (eleventh pass).
  • the difference in seam gap in a state where a load is removed after pressing is small, that is, 20 mm. Accordingly, it is understood that the substantially uniform seam gaps can be obtained regardless of a yield strength of the steel plate.
  • a graph a indicates an example where pressing-down is performed until the open seam edges are brought into contact with the punch beam portion of the upper die.
  • graph b pressing-down amount being fixed
  • a deviation in the seam gap in a state where a load is removed after pressing is small.
  • the seam gap in a state where a load is removed is large compared to the seam gap of the above-mentioned present invention example.
  • the reason pressing-down is further performed by 9 mm after the open seam edges are brought into contact with the punch beam 21 of the upper die is based on the following technical concept.
  • a plurality of open seam pipes having the same size are formed.
  • the press condition is basically fixed and hence, a deformation mode from a steel plate which is a raw material to an open seam pipe is basically the same. Accordingly, by setting a pressing-down amount to be further added from such a state as a fixed value with reference to a predetermined shape in the course of a final press, a seam gap in a state where a load is removed after the final press also becomes a fixed value.
  • the seam gap which is an index of a predetermined shape in the course of the final press where the pressing-down amount to be added is set to a fixed value
  • the seam gap at a point of time that the open seam edges on both sides are brought into contact with the punch beam 21 of the punch 2 is adopted.
  • a pressing-down amount to be further added from a point of time that both open seam edges on both sides are brought into contact with the punch beam 21 of the upper die 2 is grasped and determined by performing a preparatory forming in advance or by referencing the past manufacturing records.
  • the determination that the seam gap reaches a predetermined value can be performed by using a detector of a type by which a position of a plate end can be measured any time or a simplified detector of a type which determines that a plate end arrives at a certain position.
  • a light projector and a light receiver are mounted on the punch beam 21.
  • An amount of received light which the light receiver receives changes when the open seam edge of the open seam pipe blocks an optical path to the light receiver from the light projector.
  • the position of the open seam edge can be detected based on such a change in amount of light by the light receiver.
  • it is sufficient to detect a point of time that the open seam edges are brought into contact with the punch beam 21 of the upper die 2 it is not always necessary to constantly measure the position of the plate end portion.
  • the determination that the seam gap reaches a predetermined value can be realized by a change in an electrical conduction state which is brought about by a contact between the open seam edges and the punch beam 21 or the confirmation of the presence or the non-presence of the contact by mounting a piezoelectric element on a contact expected portion.
  • a signal may be transmitted to a pressing-down device of a press forming device at a point of time that the seam gap becomes the predetermined seam gap amount, and forming with an additional pressing-down amount which is decided in advance separately may be performed using such a signal as a trigger.
  • An additional pressing-down amount can be measured by measuring a moving amount of the punch 2.
  • an amount that the open seam edges which are brought into contact with the punch beam 21 slide upward along the punch beam 21 may be detected and an additional pressing-down amount may be controlled with reference to this slide-up amount of the open seam edges.
  • open seam gaps of an open seam pipe are continuously tack welded to each other by the continuous tack welder and, thereafter, main welding may be performed in order of inside welding and outside welding. It is preferable to increase circularity of a steel pipe to which main welding is applied by expanding the steel pipe using a pipe expanding device.
  • a pipe expanding step is performed while usually setting a pipe expanding ratio (a ratio of an amount of change in an outer diameter of the pipe after expanding the pipe with respect to the outer diameter of the pipe before expanding the pipe) to a value which falls within a range from 0.3% to 1.5%. From a viewpoint of a balance between a circularity enhancing effect and ability which the pipe expanding device is required to possess, the pipe expanding ratio may preferably be set to a value which falls within a range from 0.5% to 1.2%.
  • each steel plate is divided in three in the longitudinal direction thus preparing three sets of specimens where each set is constituted of 10 pieces of specimens.
  • a plate width of these steel plates is set to 3693 mm by machining, and edge crimping is applied to both respective edge portions of each steel plate in the width direction within a range of width of 180 mm using a die having a radius of R380 mm and, thereafter, press forming is performed.
  • a punch whose punch leading end portion 22 has a radius of R415 mm is used as a punch 2 of an upper die.
  • dies 1 having a radius of R100 mm are set in a spaced-apart manner with a gap of 540 mm (the gap being a distance between peak points of two dies 1a, 1b of the lower die).
  • the press forming is performed 11 times in a divided manner.
  • a thickness of the punch beam 21 is 100 mm.
  • a first half step is constituted of passes 1 to 5
  • a second half step is constituted of passes 6 to 10.
  • the steel plate is sequentially formed from an edge portion on one side of the steel plate in the width direction to a center portion of the steel plate in the width direction.
  • the forming is performed from the edge portion on one side of the steel plate to the position in front of the center portion of the steel plate in the width direction by an amount corresponding to a press of one time.
  • the steel plate is sequentially formed from an edge portion on the other side of the steel plate in the width direction from the edge portion on the other side of the steel plate to the center portion of the steel plate in the width direction.
  • a pressing force is applied to the center portion of the steel plate in the width direction.
  • a steel plate is set such that the center of the steel plate in the width direction is disposed at the center of the lower die.
  • edge portions of the steel plate in the width direction that is, open seam edges of an open seam pipe are brought into contact with the punch beam 21 and, thereafter, the steel plate is further pressed down by 9 mm.
  • a pressing-down amount which is an amount that the punch 2 is lowered from an upper surface position of the steel plate is set to 48.6 mm.
  • a steel plate is pressed down until open seam edges of an open seam pipe are brought into contact with the punch beam 21, and a seam gap is confirmed in a state where a load is removed after pressing, a distance between the dies 1a, 1b of the lower die is adjusted and, thereafter, the pressing-down is repeated.
  • a required time for press forming is slightly short in the comparison example 1, in the steel plate J having the lowest yield strength, a state is brought about where the open seam edges clamp the punch beam 21. Accordingly, it is necessary to stop a line for taking out a formed member (open seam pipe) and hence, it is difficult to adopt the comparison example 1 for industrial production thereof. Further, in the comparison example 2, a required time is 1.4 times as long as that of the present invention example thus lowering the productivity, although the open seam pipe has a stable shape.
  • the method for press-forming a steel pipe and a method of manufacturing a steel pipe according to the present invention are not limited to the manufacture of a steel pipe having a large diameter and a heavy wall thickness, and are applicable to all methods of manufacturing a steel pipe by performing the three point bending press.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP13885877.4A 2013-05-30 2013-05-30 Verfahren zum pressformen eines stahlrohrs und verfahren zur herstellung eines stahlrohrs Active EP3006129B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/003435 WO2014192043A1 (ja) 2013-05-30 2013-05-30 鋼管のプレス成形方法および鋼管の製造方法

Publications (3)

Publication Number Publication Date
EP3006129A1 true EP3006129A1 (de) 2016-04-13
EP3006129A4 EP3006129A4 (de) 2016-06-22
EP3006129B1 EP3006129B1 (de) 2019-07-10

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EP13885877.4A Active EP3006129B1 (de) 2013-05-30 2013-05-30 Verfahren zum pressformen eines stahlrohrs und verfahren zur herstellung eines stahlrohrs

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EP (1) EP3006129B1 (de)
JP (1) JP5967302B2 (de)
CN (1) CN105246609B (de)
RU (1) RU2648813C2 (de)
WO (1) WO2014192043A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112019018762B1 (pt) 2017-03-15 2023-12-12 Jfe Steel Corporation Molde de prensa e método para fabricar tubo de aço
DE102018211311B4 (de) * 2018-07-09 2020-03-26 Sms Group Gmbh Erweiterte Regelung JCO-Formpresse
CN108994120A (zh) * 2018-08-01 2018-12-14 上海锆卓船舶设计有限公司 适用超高强度、超厚钢板的小直径圆筒的卷制方法及系统
RU2769596C1 (ru) 2018-09-14 2022-04-04 ДжФЕ СТИЛ КОРПОРЕЙШН Способ изготовления стальной трубы и матрица
JP7108523B2 (ja) * 2018-11-27 2022-07-28 Hoya株式会社 プレス成形装置、プレス成形方法及びプレス成形プログラム

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Publication number Priority date Publication date Assignee Title
SU366009A1 (ru) * 1971-04-30 1973-01-16 Научно исследовательский институт асбестоцементной промышленности Стержневая мельница
FI74414C (fi) * 1980-08-18 1988-02-08 Sl Tuotanto Oy Anordning foer framstaellning av ett metallroer.
JPH10166059A (ja) * 1996-12-06 1998-06-23 Mitsubishi Heavy Ind Ltd 板の曲げ加工方法
JP3564278B2 (ja) 1997-10-29 2004-09-08 三菱重工業株式会社 プレス成形金型
TW449509B (en) * 1998-11-04 2001-08-11 Kawasaki Steel Co Bending rolls, and pipe formed thereby
JP2003154411A (ja) * 2001-09-10 2003-05-27 Chuo Spring Co Ltd プレス装置とプレス装置のプレス型
CN1738687A (zh) * 2003-01-20 2006-02-22 新日本制铁株式会社 金属箔管及其制造方法与制造装置
JP5511760B2 (ja) * 2005-07-04 2014-06-04 ホシザキ電機株式会社 ショーケース
WO2012092909A1 (de) * 2011-01-07 2012-07-12 Technische Universität Dortmund Verfahren zum inkrementellen umformen von blechstrukturen, insbesondere zum umformen von rohren oder dgl.
DE102011009660B4 (de) * 2011-01-27 2013-05-29 Sms Meer Gmbh Vorrichtung und Verfahren zum Umformen von Flachprodukten in Schlitzrohre oder Rohrvorprodukte
JP5614324B2 (ja) * 2011-02-21 2014-10-29 Ｊｆｅスチール株式会社 鋼管の製造方法
EP2529849B1 (de) * 2011-05-31 2021-03-10 SMS group GmbH Verfahren und Vorrichtung zum Herstellen von Schlitzrohren aus Blechtafeln
DE102011053676B4 (de) * 2011-09-16 2016-09-08 EISENBAU KRäMER GMBH Rohrbiegemaschine

Also Published As

Publication number Publication date
EP3006129B1 (de) 2019-07-10
RU2015155551A (ru) 2017-07-06
CN105246609B (zh) 2017-03-15
JPWO2014192043A1 (ja) 2017-02-23
RU2648813C2 (ru) 2018-03-28
EP3006129A4 (de) 2016-06-22
WO2014192043A1 (ja) 2014-12-04
JP5967302B2 (ja) 2016-08-10
CN105246609A (zh) 2016-01-13

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