EP2544833A1 - Ligne de formage et procédé de fabrication d'un tube multicouche - Google Patents

Ligne de formage et procédé de fabrication d'un tube multicouche

Info

Publication number
EP2544833A1
EP2544833A1 EP10713416A EP10713416A EP2544833A1 EP 2544833 A1 EP2544833 A1 EP 2544833A1 EP 10713416 A EP10713416 A EP 10713416A EP 10713416 A EP10713416 A EP 10713416A EP 2544833 A1 EP2544833 A1 EP 2544833A1
Authority
EP
European Patent Office
Prior art keywords
tube
pipe
material layer
layer
einformstraße
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.)
Withdrawn
Application number
EP10713416A
Other languages
German (de)
English (en)
Inventor
Bernd Berg
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.)
Bergrohr GmbH Siegen
Original Assignee
Bergrohr GmbH Siegen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bergrohr GmbH Siegen filed Critical Bergrohr GmbH Siegen
Publication of EP2544833A1 publication Critical patent/EP2544833A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B21C37/09—Making tubes with welded or soldered seams of coated strip material ; Making multi-wall 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
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/154—Making multi-wall 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers

Definitions

  • the present invention relates to an injection molding line and a method for producing a multilayer pipe.
  • Multilayer pipes are preferably used in case of high requirements against corrosion or abrasion.
  • Corrosion-resistant pressure vessels or pressure lines can be produced more cost-effectively by using multilayer pipes than solid versions made of appropriate materials. This is achieved by the load sharing on a thin, corrosion resistant inner layer (e.g., stainless and acid resistant steel) and a preferably thick, high strength, pressure resistant outer layer (e.g., fine grain structural steel). As a result, overall steel consumption can be significantly reduced and much of the remaining steel consumption can be shifted to low-cost materials.
  • a thin, corrosion resistant inner layer e.g., stainless and acid resistant steel
  • a preferably thick, high strength, pressure resistant outer layer e.g., fine grain structural steel
  • Abrasion-resistant pipes are made possible by the design as a multilayer pipe (such as mechanical bond, see below) in certain grades in the first place, because materials (eg high-strength steels with high hardness) can be used as an inner layer, which alone or only very difficult can be processed into tubes.
  • CONFIRMATION COPY In the construction of the tubular jacket, a distinction is made between full-surface metallurgical bond (this requires rolled or snarf-plated sheet metal as a starting semifinished product), and purely mechanical bonding (such as a friction bond) between the inner and outer tubes - preferably inner and outer plates and their frictional connection (such as a welding or gluing) on the sheet edges -.
  • steel sheets - is used as a starting semi-finished a clad composite sheet of two different (steel) materials use.
  • the disadvantage of this method according to the prior art is the one in the high cost of the starting semi-finished product and thus the end product, on the other hand, in a lack of sufficient availability of this starting semi-finished product due to extremely limited production capacity for this in the world, it being noted that such Semi-finished composite also only as metal sheets and not as a band - as a material roll (coil) - is available. Furthermore, the number of materials that can be processed in this way, limited. For example, certain abrasion-resistant steels can not be used as the inner layer if they are difficult or impossible to weld because of their high carbon content.
  • the inner tube is pressed under elastic / plastic expansion of the outer tube in the outer tube. After elimination of the expansion forces, the outer tube sets because of the higher elastic resilience frictionally around the inner tube.
  • the disadvantage of this method according to the prior art is due to the fact that the outer tube must have a higher yield strength than the inner, otherwise the lack of adhesion to the inner tube causing and therefore required elastic resilience of the outer tube.
  • This is particularly disadvantageous because high-strength materials - such as particularly high-strength steels - as they are preferably particularly favorable for abrasions- or corrosion-resistant piping inside the pipe, high or even very high yield strengths and thus are not suitable for this manufacturing process.
  • US Pat. No. 3,327,383 also discloses a continuous process for producing double-layer pipes by means of an injection molding line, but this process is also suitable for producing multilayer pipes of the type required here, namely those having a good frictional connection between external pipes.
  • inner layer unsuitable, since in this process inner and outer layers little or no forces exert on each other, but come to lie loosely together, which is achieved in that the outer layer is wider than the inner layer, so that the inner layer during the tube forming process until into the final position that fits into the external situation.
  • the inner layer does not exert any force on the outer layer, which also does not appear feasible due to the thickness ratios of thick inner to thin outer layer.
  • first joint such as a weld seam
  • first joint such as a weld seam
  • this method has the technical production disadvantage that it is necessary to create a further connection between the material layers during the tube forming in the bending roll after a certain deformation progress, which is usually done by welding. It is therefore necessary for this connection to To break the formation to connect the two layers of material at this further point.
  • the still unfinished pipe must be removed from the bending roll and then created the connection, so in general, the weld can be applied.
  • it can also be welded in the bending roll, which however blocks it during this time.
  • the tube blank also called slot tube
  • Such a procedure is extremely time-consuming and therefore represents a significant production cost disadvantage.
  • WO 2006/066814 Al also teaches a method in which individual layers of material to be combined with the multilayer pipe are stacked, a material layer acting as a respective outer tube forming a base plate, which is approximately endang its two longitudinal edges or approximately parallel to each one, preferably welded, abutting edge and the overlying material layer comes to rest loosely between these abutment edges, and the multilayer material thus formed is formed with the aid of the bending roll to form a multilayer pipe, wherein the respective functioning as an inner tube material layer clamped between the stop edges and in the final phase of pipe forming in the bending roll, the respective material layer functioning as an inner tube is thereby pressed non-positively into the respective material layer functioning as outer tube.
  • WO 2006/066814 A1 as the respective inner layer, it is therefore also possible to use those materials, such as particularly high-strength steels, which are difficult or impossible to weld.
  • the material layer acting as an inner tube is already pressed into the bending roll in the bending roll in a force-fitting manner into the respective material layer acting as the outer tube and thus held frictionally in the respective outer tube without the need for a connection, such as a weld to be created. Therefore, a time- and cost-intensive interruption of the tube forming process in the bending roll is also not required here.
  • this manufacturing method again has the disadvantage that in this case the inner tube position is not completely closed inwards, since a part of the tube inner circumference by the on the respective base plate, so the because the outside material layer, attached stop edges is formed, which means that here the beneficial effects of the pipe inner layer, such as corrosion or abrasion resistance can not occur.
  • This disadvantage can not be solved easily by a build-up welding in this area, as a weld between the material of the stop edge and the inner layer in this process, which wants to avoid welding between outer and inner layer, just out of the question.
  • a multilayer pipe can be produced without interruption of the tube forming process for material layer connection and without subsequent incorporation of material blade parts, which ensures a good connection between inner and outer layer, without requiring metallurgically bonded material layers by means of single to multilayer pipe material layers to be combined - Guides, preferably by means of (possibly driven) Zuglassrollen, taken as a band and stacked, and thus formed from the auffactüegenden material layers
  • Mehrlagen- material is formed by a Einformstation or Einformstationen the Einform No to the tube that the tube radius forming and by their formed inner rollers of the molding station or successively arranged Einformstationen towards the Rohrfertigende out (ie towards the finished end of the tube) has reached the desired Rohrendradius
  • the method according to the invention is characterized in that the width of each acting as an inner tube material layer band Bi is selected so that
  • SI as the wall thickness of the respectively acting as inner tube material layer strip in mm.
  • DA as the outer diameter of the outer tube - and thus as the diameter of the multilayer tube at all - in mm
  • SA the wall thickness of the outer tube in mm
  • SI the wall thickness of the inner tube in mm
  • ⁇ yield strength (which usually corresponds approximately to the compression limit, in particular for rolled metals) of the inner tube in N / mm 2 ,
  • E elastic modulus (modulus of elasticity) of the inner layer in N / mm 2 .
  • L n fa - The length of the neutral fiber - in a circular bent state - of the outer tube - here called L n fa - is:
  • L nfi os (DA-2, SA-SI). *, which also corresponds to the average circumferential length - here, however, the inner tube - amount.
  • the inner layer can exactly fit into the outer layer during tube forming, which means that the respective longitudinal edges of the outer, as well as the inner layer with the completion of Rohrformungreaes- a geometrically ideal running tube forming process, ie the ideal formation of a circle (seen in the tube cross section) once assumed - at the same time abut.
  • the inner tube would be pressed against the outer layer only by its built-up during the forming process spring-back force.
  • the respective material layer acting as an inner tube is compressed in the tube formation - for example by the forming station or the molding stations of the injection molding line - the respective material layer acting as an inner tube is thereby also moved into the respective outer (ie, outwardly adjacent to the inner tube).
  • This pressing force can be up to the yield strength (respectively compression limit, which is usually - especially in rolled metal sheets, approximately equal to the yield strength) increase.
  • the so-called technical yield strength also yield strength as the magnitude of the stress of a plastic see permanent strain under a certain force called
  • technical compression limit occur.
  • the width of the inner layer is chosen to be greater than or equal to the term on the right of the equation, a possible compression allowance is taken into account, which is capable of compensating the production inaccuracies, for example in position and / or guiding of the material layer bands, such that the desired maximum pressing force of the inner tube against the outer tube is achieved in any case approximately.
  • the multilayer pipe is also closed by an application weld of the inner pipe (from the inside) so as to complete the multilayer pipe body.
  • a preferred application of the method according to the present invention is the production of double-layer tubes according to the invention, however, limited Invention not on this, even three-, four- and more multi-layer pipes according to the invention are hereby basically produced.
  • sheets preferably metal sheets, and more preferably steel or sheet metal of corrosion resistant metal or corrosion resistant alloys (e.g., stainless steel sheets or e.g., copper or chromium-nickel alloys, for example) are used as the material layer or elements of the material sheet in the present inventive multilayer pipe manufacture.
  • corrosion resistant metal or corrosion resistant alloys e.g., stainless steel sheets or e.g., copper or chromium-nickel alloys, for example
  • the method according to the invention can serve a Einform No for producing a multi-layer tube, which is designed so that it supply means, preferably feed rollers, which receives each individual to multilayer pipe material layers to be combined as a band and superimposed, and has at least one Einformstation, the the shaping of the multi-layer tube from the multilayer material formed from superimposed material layers by means of rollers, wherein at least in the case of an injection station at least one roller is designed as a profile role, whose profile is shaped in such a way that it is so against the longitudinally extending in the tube direction edges at least one of the material bands acts, that the respective functioning as an inner tube material layer is pressed by compression in its periphery frictionally in the respective functioning as an outer tube material layer and that the tube forming the interior of a - preferably d he last arranged in the direction towards the Rohrfertigende down - Einformstation is designed so that it corresponds to the desired pipe radius.
  • the profile rollers also ensure that the inner tube can be compressed in the outer tube, without the longitudinal edges of the material layers, which abut later, slip over each other.
  • the material layers to be combined for multilayer pipe are preferably each ready on a reel associated with the forming line, from which they are then unwound, stacked on top of each other and then fed to the nearest preforming station.
  • This type of material layer supply is particularly favorable because the wound material layer tapes (so-called, coils') on the one hand saves space on the other hand also to handle particularly well by the settlement of the tape by a rotary movement.
  • the contiguous longitudinal edges of the respectively acting as inner tube material layer are still connected, preferably welded, in the state of their caused by the Einformstation or Einformstationen compression, which is done for example by means of a laser or other suitable welding process, such as by means of such Lasers through the still open slot between the longitudinal edges of the respective outer layer (s) on the respective inner layer at the point where their longitudinal edges abut.
  • Einformiere in which after the (eg first) Einformstation, in which the interior, which forms the tube is dimensioned so that it corresponds to the desired tube radius, another station is arranged with rollers, whose interior is also sized so that it corresponds to the desired pipe radius, whereby the multilayer pipe between these two stations is still held in the state of compression of acting as an inner tube material layer and the welding station, preferably the laser between these two stations is arranged, resulting in a closing
  • the weld allows before the compression by the stations is eliminated
  • the adjoining longitudinal edges of the material layers which respectively act as the outer tube are preferably also closed in the state of compression of the material layer acting as inner tube by the shaping station or the molding stations.
  • the finished multilayer pipe can be wound on a reel, such as when it is provided as part of the Einform letters.
  • Such reels can be used directly on pipe laying ships. This is particularly favorable if the Rohrfertigung done directly in the harbor, from where the finished tube immediately runs to the reel on a ship.
  • Such reels on pipe laying ships have enormous capacity.
  • the reels used on the "Skandi Navica" pipe-laying vessel have a diameter of 25 m and a load-bearing capacity of 2500 t, so that pipes with a diameter of 101.6 mm to 457.2 mm can be laid, for example Pipe diameter of about 203.2 mm can be wound on the reel, for example, 42 km of pipe and laid in one piece (see, for example: Fitmerünformationsschrift entitled “Rolling Bearings for One of the Largest Reels on the Pipe Laying Ship Skandi Navica- Examples from Application Engineering, WL 21 508 DA", Schaeffler KG, Heavy Industries, Mining & Processing, 97419 Schweinfurt, 2007, there S.
  • Fig. 2 is a perspective sketched perspective view of an embodiment of an injection molding according to the invention in the direction of the tube finished out from the material inlet ago seen, and
  • Fig. 3 is an exemplary stress-strain diagram for explaining how the desired maximum compressive force is achieved by compression of the inner layer in the scope.
  • Fig. 1 shows a detail of an embodiment of a Einform No. 1 which can serve to carry out the method according to the present invention.
  • the Einform No. 1 is here in the upper part A from the side in the longitudinal direction, including in part B viewed from above in the longitudinal direction and below in part C.
  • part B viewed from above in the longitudinal direction and below in part C.
  • part C At selected points in the cross section to see, with the proportions of the representations (especially in Part C of the local representation) do not always correspond to reality (In reality, the diameter of the tube decreases towards the end).
  • the Einform No for producing a multi-layer tube 5 is here designed so that it has feed rollers 3 as feed, the individual to multi-layer tube 5 to be combined material layers 1, 2 each receives as tape and stacked, and thereafter several successively arranged Einformstationen 4, 4a, 4b , the forming of the multilayer pipe 5 from the superimposed material layers 1, 2 formed Mehrlagen- material by means of rollers 6, in which a plurality of Einformstationen 4, 4a have at least one roller 6 as a profile roller 6a, whose profile is shaped in such a way that so against the longitudinally extending in the tube direction edges of at least one of the material bands 1, 2 acts that the respective functioning as an inner tube material layer 1 is pressed by compression in its periphery non-positively in the respective acting as an outer tube material layer 2 and that of the tube forming interior of the last towards the tube 1 0 out arranged forming station 4b is designed so that it corresponds to the desired pipe radius.
  • the interior of the tube forming the successively arranged Einformstationen 4, 4a, 4b decreases here in the direction of the tube finished 10 down to the desired Rohrendradius.
  • the Einform examples here each have a reel 7a, 7b for the material layers 1, 2 to be combined, on which they are each provided as a wound band (as a so-called coil).
  • a welding station 8 is arranged, the to each other welding there abutting longitudinal edges of each acting as an inner tube material layer 1 is used.
  • a laser 8 In the present case serves as a welding station, a laser 8, but this is not mandatory.
  • Another station 4b is provided with rollers 6 whose interior is also sized to meet the desired pipe radius corresponds, whereby the multilayer pipe between these two stations 4a, 4b is still held in the state of compression of acting as an inner tube material layer 1.
  • the welding station 8, which closes the inner layer 1 of Mehrlagenrohresa 5, is arranged between the two stations 4a, 4b, so that the tube is still held here in the state of compression of acting as an inner tube material layer 1.
  • a welding station for the connection welding of the outer layer 9 is arranged, which is a connecting weld for connecting the longitudinal edges of the outer tube acting as outer Material layer 2 is used.
  • This welding station for the connection welding of the outer layer 9 is arranged just behind the Einformstation 4b, so that the multilayer pipe 5 is still held in the state of compression of acting as an inner tube material layer 1.
  • the welding station for the connection welding of the outer layer 9 can also be held between two stations, between which the multilayer tube is still in the state of compression of the material layer 1 acting as inner tube. be arranged. This can be done, for example, by arranging the welding station for joint welding of the outer layer 9, as well as the welding station 8 (but after this), between the two molding stations 4a and 4b.
  • the inventive welding of the outer layer ensures that in this case the inner layer held in the state of compression and the desired compression of the layers against each other thereby achieved.
  • FIG. 2 shows a perspective sketch of an embodiment of an injection molding line according to the invention in the direction of the tube-making end 10 as seen from the material inlet.
  • the use of the reference numbers corresponds to those of FIG. 1.
  • the Einform No in the embodiment according to the invention according to this Figstst corresponds to that of FIG. 1, but here no reels are seen, from which the bands of Werkstoffiagen 1, 2 are unwound.
  • the Zuwoodrnittel to Einform Given are not visible.
  • the preservation of the compression state of the inner tube layer 1 in the finished multilayer pipe 5 is achieved in that the welding station for the connection welding of the outer layer 9 is arranged here in front of another additional station 4c, the formed by their roles 6 interior space is such that it corresponds to the desired pipe radius and which is arranged after the station 4b, whereby between the station 4b and the thus further station 4c, the multilayer pipe 5 still in the state of compression of the functioning as an inner tube material layer. 1 is held.
  • the welding station for the connection welding of the outer layer 9 is thus arranged here between these two stations 4b, 4c.
  • Fig. 3 shows an exemplary stress-strain diagram for explaining how the desired maximum pressing force is achieved by compression of the inner layer in the scope.
  • the aim of the present invention is to compress the inner layer material of the multilayer tube so far that one arrives in the region S of the stress-strain diagram to be seen here, so as to achieve the compression of the maximum possible compression of the inner to the outer layer, which ensures a tight fit of the inner and outer tubes soU.
  • the respective material layer acting as an inner tube is compressed in width by the forming station or the molding stations of the injection molding line, then the respective material layer acting as inner tube becomes also the respective outer material layer (ie, seen from the inner tube) pressed.
  • This pressing force can be up to the yield strength ⁇ (respectively compression limit, which is usually - especially in rolled metal sheets, approximately equal to the yield strength -) increase.
  • the so-called technical yield strength also referred to as the yield strength as the amount of stress of a plastic permanent elongation under a certain force
  • technical compression limit can be cited instead.
  • the maximum pressing force of the inner against the outer layer is to be achieved as reliably as possible, in any case approximately, it must be ensured that the compression limit ⁇ 1 (yield strength) is actually reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un tube multicouche (5) au moyen d'une ligne de formage, dans lequel différentes couches de matériau (1, 2), à combiner pour obtenir le tube multicouche (5), sont amenées sous forme de bandes et sont superposées à l'aide de moyens d'admission (3), de préférence des rouleaux d'admission, et le matériau multicouche ainsi formé à partir des couches de matériau (1, 2) superposées, passant par un poste de formage (4) ou des postes de formage (4, 4a, 4b, 4c) de la ligne de formage, est transformé en tube (5) par le fait que dans le poste de formage (4) ou les postes de formage (4, 4a, 4b, 4c) consécutifs, le volume intérieur de celui-ci ou de ceux-ci, formé par leurs rouleaux respectifs et formant le rayon du tube, a atteint le rayon du tube souhaité en allant vers l'extrémité finie (10) du tube, selon lequel la largeur Bi de la bande de matériau (1), destinée à former respectivement le tube intérieur, est choisie de telle sorte que Bi > Lnfa - Π (SA + SI), Bi étant la largeur de la bande de matériau destinée à former respectivement le tube intérieur, Lnfa étant la largeur de la bande de matériau destinée à former respectivement le tube extérieur, SA étant l'épaisseur de paroi du tube extérieur et SI étant l'épaisseur de paroi du tube intérieur mm. L'invention concerne également une ligne de formage pour la fabrication d'un tube multicouche, laquelle est destinée à la mise en œuvre du procédé susmentionné.
EP10713416A 2010-03-11 2010-03-11 Ligne de formage et procédé de fabrication d'un tube multicouche Withdrawn EP2544833A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/001540 WO2011110195A1 (fr) 2010-03-11 2010-03-11 Ligne de formage et procédé de fabrication d'un tube multicouche

Publications (1)

Publication Number Publication Date
EP2544833A1 true EP2544833A1 (fr) 2013-01-16

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Country Link
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WO (1) WO2011110195A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012019315A1 (de) * 2012-10-02 2014-04-03 Bergrohr Gmbh Siegen Verfahren zur schnellen Herstellung eines Mehrlagenrohres
CN107166110B (zh) * 2017-06-29 2023-02-17 湖州新兴汽车部件有限公司 一种多层式降噪隔热消音管及其生产设备

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DE520305C (de) * 1927-10-08 1931-03-09 Bundy Tubing Co Verfahren zur Herstellung eines zweischichtigen Verbundrohres
DE864689C (de) * 1949-03-16 1953-01-26 Fritz Dipl-Ing Stiehl Verfahren zur Herstellung zweischichtiger Verbundrohre aus zwei Metallbaendern
US3327383A (en) 1963-01-03 1967-06-27 Walter C Reed Method of making clad pipe
JPS5388651A (en) * 1977-01-17 1978-08-04 Nippon Steel Corp Pipe forming stand line
JPH07115073B2 (ja) * 1984-03-15 1995-12-13 日下部電機株式会社 鋼管の連続製造装置
JPS6142427A (ja) * 1984-08-07 1986-02-28 Kawasaki Steel Corp 電縫鋼管の成形装置
JPS6142428A (ja) * 1984-08-07 1986-02-28 Ishikawajima Harima Heavy Ind Co Ltd 管成形方法及び装置
JP4546543B2 (ja) 2004-12-21 2010-09-15 ベルクローア・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・ジーゲン 多層パイプの製造方法

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