EP1393832B1 - Method and device for induction-bending of pipes - Google Patents

Method and device for induction-bending of pipes Download PDF

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Publication number
EP1393832B1
EP1393832B1 EP03090269A EP03090269A EP1393832B1 EP 1393832 B1 EP1393832 B1 EP 1393832B1 EP 03090269 A EP03090269 A EP 03090269A EP 03090269 A EP03090269 A EP 03090269A EP 1393832 B1 EP1393832 B1 EP 1393832B1
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EP
European Patent Office
Prior art keywords
bending
plane
pressure rollers
pressure
induction
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Expired - Lifetime
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EP03090269A
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German (de)
French (fr)
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EP1393832A1 (en
Inventor
Uwe Arenz
Norbert Leppmann
Johannes Dr. Gross-Weege
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Vodafone GmbH
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Mannesmannroehren Werke AG
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    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
    • B21D7/025—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member and pulling or pushing the ends of the work
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
    • B21D9/18—Auxiliary equipment, e.g. machines for filling tubes with sand for heating or cooling of bends

Definitions

  • the invention relates to a method and an apparatus for the induction bending of pipes according to the Preamble of claim 1, or of claim 8.
  • This proposed procedure is to be carried out by a system in which before or behind or in front of and behind the inductor in an adjustable distance from the pipe Scaffold at least four in their distance from each other by means of known hydraulic Servomotors of a hydraulic system via hydraulic elements infinitely adjustable Pressure rollers arranged in at least two mutually perpendicular planes are.
  • JP 56026625 A a device for the induction bending of pipes is disclosed.
  • a guide is arranged, consisting of a tube comprising the holding device with a plurality of distributed over the circumference arranged pressure rollers.
  • the distance between two opposing pressure rollers corresponds to the actual outside diameter of the incoming pipe.
  • the adjustable to a predetermined distance pressure rollers to prevent the ovalization of the bent pipe.
  • two axially spaced apart pressure rollers are provided per set of rollers.
  • the object of the invention is to specify a method and a device for the induction bending of pipes, with the reproducible the formation of an impermissible ovality in the bow area is avoided.
  • each of the heating zone leaving arc section in one of the largest expected ovality selected level at least two Setting the circumference to the nominal outside diameter of the pipe bend, forcibly guided, wherein in the rearward extension of the plane the center of rotation of the Biegearmes cuts.
  • the optimal positions to be set and distances of the rollers are each through previous calculation, eg B. determined by finite element method (FEM).
  • FEM finite element method
  • Figure 2 shows the same cross section 2 of an arc section as Figure 1 but with an exaggerated representation of the wall thickness.
  • the output tube is pressed not only oval by the forces acting on the induction bending, but at the same time the wall thickness is reduced 3 in the tension zone and the wall thickness 4 is upset in the pressure zone.
  • FIG. 3 schematically illustrates an inventive inductive bending system 5. It consists of a here only indicated water-cooled inductor 6, a clamping element 7 with an attached bending arm 8. The alignment lines of the inductor 6 and the bending arm 8 intersect at the fulcrum. 9
  • the bending process now proceeds in such a way that the output tube 10 by means of the inductor 6 is heated in a narrow strip over the circumference.
  • the at the front End mounted clamping element 7 is connected to a bending arm 8, the is pivoted slowly according to the feed. Act through the swing Forces on the heated narrow strip of the output tube 10 and force it to follow the curved path defined by the bending radius R.
  • a framework 11 is arranged behind the inductor 6.
  • it is equipped with three, preferably hydraulically adjustable, pressure rollers 14, 14 ', 14 "(see FIG. 4 ).
  • the pressure rollers 14, 14', 14" have a diaboloform in cross-section.
  • Andeutungmud are the employment of the pressure rollers actuated hydraulic units 12, 13, 13 'shown. They are arranged in this embodiment that in the Y-axis two 13, 13 'are approximately opposite each other and in the X-axis a hydraulic unit 12 is located in the pressure zone area.
  • the on the hydraulic units 13, 13 'drawn circumferential arrows are intended to indicate the possibility of optimal To be able to adjust the position variably.

Abstract

During the bending stage, a pressure is applied to the tube behind the heated zone. The bent section coming from the heating zone is forcibly guided for nominal outer diameter, on at least two points of its periphery, in a plane having the maximum expected ovality. When extended to the back, the plane cuts across the center of the bending arm (8). The bending appliance (5) has a water-cooled inductor (6), a bending arm, and a frame (11) with at least continuously adjustable pressure rollers, moveable in peripheral direction. The rollers are positioned opposite to each other and are fixed at a set relative distance during bending.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Induktivbiegen von Rohren gemäß dem Oberbegriff des Patentanspruches 1, bzw. des Patentanspruches 8.The invention relates to a method and an apparatus for the induction bending of pipes according to the Preamble of claim 1, or of claim 8.

Aus der DE-OS 2112019 ist ein Verfahren und eine Vorrichtung zum Induktivbiegen von Rohren bekannt. Bei diesem Verfahren wird mittels einer Induktivspule partiell ein Rohrabschnitt über den gesamten Rohrumfang erwärmt und mit Hilfe eines Biegearmes gebogen. Nachteilig bei diesem Verfahren ist, dass der Rohrbogen aufgrund der einwirkenden Kräfte über den gesamten Bogenbereich eine Ovalität aufweist, die eine Nacharbeit des Bogenbereiches erforderlich macht, um den vorgegebenen Durchmesser zu erzielen.From DE-OS 2112019 a method and an apparatus for the induction bending of pipes is known. at This method is by means of an inductive coil partially a pipe section over the heated entire pipe circumference and bent by means of a bending arm. A disadvantage of This method is that the pipe bend due to the forces acting on the entire arch area has an ovality, which is a rework of the arch area required to achieve the given diameter.

Zur Überwindung dieses Problems ist bereits vorgeschlagen worden (DE 3150381 A1), dass während des Biegevorganges, unmittelbar vor oder hinter bzw. vor und hinter der Erwärmungszone, in mindestens zwei senkrecht zueinander stehenden Ebenen ein beidseitig auf das Rohr wirkender, erforderlichenfalls sich im Bogenablauf umkehrender, Druck ausgeübt wird. Dieser Druck soll eine umgekehrte Rückfederung berücksichtigende Vorovalität sowohl in waagerechter Biegeebene als auch senkrecht dazu im elastoplastischen Werkstoffbereich bewirken.To overcome this problem has already been proposed (DE 3150381 A1), that during the bending process, immediately before or behind or in front of and behind the Warming zone, in at least two mutually perpendicular planes acting on both sides of the tube, if necessary reversing in the arc, Pressure is exercised. This pressure should take into account a reverse springback Vorovality both in horizontal bending plane and perpendicular to it in cause elastoplastic material area.

Diese vorgeschlagene Verfahrensweise soll durch eine Anlage erfolgen, bei der vor oder hinter bzw. vor und hinter dem Induktor in einem im Seitenabstand vom Rohr einstellbaren Gerüst mindestens vier in ihrem Abstand voneinander mit Hilfe an sich bekannter hydraulischer Stellmotoren von einem Hydrauliksystem über Hydraulikelemente stufenlos anstellbare Druckrollen in mindestens zwei senkrecht zueinander stehenden Ebenen angeordnet sind.This proposed procedure is to be carried out by a system in which before or behind or in front of and behind the inductor in an adjustable distance from the pipe Scaffold at least four in their distance from each other by means of known hydraulic Servomotors of a hydraulic system via hydraulic elements infinitely adjustable Pressure rollers arranged in at least two mutually perpendicular planes are.

Die vorgeschlagene Verfahrensweise führt nicht zum gewünschten Erfolg, da die erforderliche Vorovalisierung bzw. die zu erwartende Rückfederung nur ungenau ermittelbar ist. Sie kann zu stark oder zu schwach voreingestellt sein, so dass nach der Rückfederung eine nicht tolerierbare Ovalität verbleibt. Die Voreinstellung ist problematisch, da sie von vielen Parametern gleichzeitig abhängt. Es fließen das s/D-Verhältnis, das R/D-Verhältnis und der Werkstoff ein. Auch das Herstellverfahren des Ausgangsrohres beeinflusst den Grad der Rückfederung.The proposed procedure does not lead to the desired result, since the required Vorovalisierung or the expected springback can only be determined inaccurately. she may be too strong or too weak, so that after springback one intolerable ovality remains. The default setting is problematic as it is by many Parameters depends simultaneously. The S / D ratio, the R / D ratio and the flow Material. Also, the manufacturing process of the output pipe affects the degree of Springback.

In der JP 56026625 A ist eine Vorrichtung zum Induktivbiegen von Rohren offenbart. Vor dem Induktor ist eine Führung angeordnet, bestehend aus einer das Rohr umfassenden Haltevorrichtung mit einer Vielzahl von über den Umfang verteilt angeordneten Druckrollen.
Der Abstand zweier einander gegenüber liegender Druckrollen entspricht dem IST-Außendurchmesser des einlaufenden Rohres. Die auf einen vorgegebenen Abstand einstellbaren Druckrollen sollen das Ovalisieren des gebogenen Rohres verhindern. Vorzugsweise sind pro Rollensatz zwei axial beabstandet voneinander angeordnete Druckrollen vorgesehen.In JP 56026625 A a device for the induction bending of pipes is disclosed. In front of the inductor, a guide is arranged, consisting of a tube comprising the holding device with a plurality of distributed over the circumference arranged pressure rollers.
The distance between two opposing pressure rollers corresponds to the actual outside diameter of the incoming pipe. The adjustable to a predetermined distance pressure rollers to prevent the ovalization of the bent pipe. Preferably, two axially spaced apart pressure rollers are provided per set of rollers.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung zum Induktivbiegen von Rohren anzugeben, mit dem reproduzierbar die Ausbildung einer unzulässigen Ovalität im Bogenbereich vermieden wird.The object of the invention is to specify a method and a device for the induction bending of pipes, with the reproducible the formation of an impermissible ovality in the bow area is avoided.

Diese Aufgabe wird ausgehend vom Oberbegriff in Verbindung mit den kennzeichnenden Merkmalen des Anspruches 1 bzw. 8 gelöst. Vorteilhafte Weiterbildungen sind Gegenstand von Unteransprüchen.This object is based on the preamble in conjunction with the characterizing Characteristics of claim 1 or 8 solved. Advantageous developments are the subject of dependent claims.

Nach der Lehre der Erfindung wird jeweils der die Erwärmungszone verlassende Bogenabschnitt in einer die größte zu erwartende Ovalität ausgewählten Ebene an mindestens zwei Stellen des Umfanges auf Nennaußendurchmesser des Rohrbogens zwangsweise geführt, wobei in rückwärtiger Verlängerung die Ebene den Drehmittelpunkt des Biegearmes schneidet.According to the teachings of the invention, each of the heating zone leaving arc section in one of the largest expected ovality selected level at least two Setting the circumference to the nominal outside diameter of the pipe bend, forcibly guided, wherein in the rearward extension of the plane the center of rotation of the Biegearmes cuts.

Aufgrund der ungleichen Kraftverhältnisse in der Zugzone im Vergleich zur Druckzone liegt die Ovalform nicht symmetrisch zum Koordinatensystem. Um dies zu berücksichtigen wird weiterbildend vorgeschlagen, eine dritte Druckrolle im Bereich der Druckzone vorzusehen. Due to the unequal force conditions in the tension zone compared to the pressure zone the oval shape is not symmetrical to the coordinate system. To take this into account weiterbildend proposed to provide a third pressure roller in the pressure zone.

Im Unterschied zum bekannten Verfahren wird keine Vorovalisierung erzeugt, sondern die nach und nach die Erwärmungszone verlassenden Bogenabschnitte werden zwangsweise geführt.In contrast to the known method no Vorovalisierung is generated, but the gradually leaving the heating zone arc sections are forcibly guided.

Diese Verfahrensweise setzt voraus, dass zu Beginn des Biegevorganges zuerst ein Stück Bogen erzeugt werden muss, um an diesen ersten Bogenabschnitt und nicht am Ausgangsrohr einen Führungszwang mittels anstellbarer Rollen ausüben zu können.This procedure requires that at the beginning of the bending process, first a piece Bow must be created to this first arc section and not at the Starting pipe to exert a leadership compulsion by means of adjustable roles can.

Um die üblicherweise mit Fortschreiten des Biegevorganges eintretende und sich stärker ausprägende Ovalisierung verhindern zu können, werden vorzugsweise die beiden einander gegenüber liegenden Rollen, bei Bedarf auch eine dritte Rolle, angestellt.To the usually with the progress of the bending process entering and stronger Preventing pronounced ovalization, preferably the two opposite roles, if necessary, a third role, employed.

Die einzustellenden optimalen Positionen und Abstände der Rollen werden jeweils durch vorherige Berechnung, z. B. mittels Finiter-Elemente-Methode (FEM) ermittelt. Damit können gezielt die Umfangsbereiche geführt werden, in denen die größte Ovalität auftritt. Der Haltedruck der angestellten Rollen muss so hoch sein, dass die eingestellten Abstände zueinander trotz der ansteigenden entgegenwirkenden Kräfte unverändert bleiben.The optimal positions to be set and distances of the rollers are each through previous calculation, eg B. determined by finite element method (FEM). In order to The peripheral areas in which the greatest ovality occurs can be selectively guided. The holding pressure of the employed rollers must be so high that the set distances remain unchanged despite the increasing counteracting forces.

Auf diese Weise werden die die Erwärmungszone verlassenden Bogenabschnitte zwangsgeführt und die Ausbildung einer unzulässigen Ovalität unterdrückt.In this way, the arc sections leaving the heating zone become forced and the formation of an impermissible ovality suppressed.

Weitere vorteilhafte Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung von einem in einer Zeichnung dargestellten Ausführungsbeispiel.Further advantageous features, advantages and details of the invention will become apparent from the following Description of an embodiment shown in a drawing.

Es zeigen:

Figur 1
schematisch den Vergleich gebogener Rohrquerschnitt mit idealem Rohrquerschnitt,
Figur 2
die Wanddickenverteilung in einem gebogenen Rohrquerschnitt,
Figur 3
schematisch eine erfindungsgemäß ausgebildete Induktivbiegeanlage,
Figur 4
eine Ansicht in Richtung X in Figur 3.
Show it:
FIG. 1
schematically the comparison of bent pipe cross-section with ideal pipe cross section,
FIG. 2
the wall thickness distribution in a curved pipe cross section,
FIG. 3
schematically an inventively designed induction bending,
FIG. 4
a view in the direction X in Figure 3.

In Figur 1 ist zur Demonstration ein schematisch induktiv gebogener Rohrquerschnitt 2 in einen idealen Rohrquerschnitt 1 eingezeichnet worden. In Figure 1 , a schematically inductively curved pipe cross-section 2 has been drawn in an ideal pipe cross-section 1 for demonstration.

Wie man gut erkennen kann, wird der ursprünglich nahezu kreisrunde Rohrquerschnitt 1 durch die beim Induktivbiegen einwirkenden Kräfte oval gedrückt. Wird mit X die waagerechte Biegeebene bezeichnet, so wird deutlich, dass in der Y-Achse der Rohrquerschnitt 2 nach außen wandert und außerhalb des idealen Rohrquerschnittes 1 liegt und umgekehrt in der X-Achse der gebogene Rohrquerschnitt 2 nach innen wandert und zumindest auf einer Seite vollständig innerhalb des idealen Rohrquerschnittes 1 liegt.As you can see well, the originally nearly circular tube cross section becomes 1 pressed oval by the forces acting on the inductive bending. Is the horizontal with X Bending plane, it is clear that in the Y-axis of the pipe cross-section 2 migrates to the outside and outside the ideal pipe cross-section 1 and vice versa in the X-axis, the curved pipe cross section 2 moves inwards and at least on one side is completely within the ideal pipe section 1.

Figur 2 zeigt den gleichen Querschnitt 2 eines Bogenabschnittes wie Figur 1 aber mit einer übertriebenen Darstellung der Wanddicke. In bekannter Weise wird das Ausgangsrohr durch die einwirkenden Kräfte beim Induktivbiegen nicht nur oval gedrückt, sondern gleichzeitig wird die Wanddicke 3 in der Zugzone verringert und die Wanddicke 4 in der Druckzone angestaucht. Figure 2 shows the same cross section 2 of an arc section as Figure 1 but with an exaggerated representation of the wall thickness. In a known manner, the output tube is pressed not only oval by the forces acting on the induction bending, but at the same time the wall thickness is reduced 3 in the tension zone and the wall thickness 4 is upset in the pressure zone.

In Figur 3 ist schematisch eine erfindungsgemäß ausgebildete Induktivbiegeanlage 5 dargestellt. Sie besteht aus einem hier nur angedeuteten wassergekühlten Induktor 6, einem Klemmelement 7 mit einem daran befestigten Biegearm 8. Die Fluchtlinien vom Induktor 6 und vom Biegearm 8 schneiden sich im Drehpunkt 9. FIG. 3 schematically illustrates an inventive inductive bending system 5. It consists of a here only indicated water-cooled inductor 6, a clamping element 7 with an attached bending arm 8. The alignment lines of the inductor 6 and the bending arm 8 intersect at the fulcrum. 9

Der Biegevorgang läuft nun in der Weise ab, dass das Ausgangsrohr 10 mittels des Induktors 6 in einem schmalen Streifen über den Umfang erwärmt wird. Das am stirnseitigen Ende angebrachte Klemmelement 7 ist mit einem Biegearm 8 verbunden, der entsprechend dem Vorschub langsam geschwenkt wird. Durch die Schwenkung wirken Kräfte auf den erwärmten schmalen Streifen des Ausgangsrohres 10 ein und zwingen es der durch den Biegeradius R festgelegten Kurvenbahn zu folgen.The bending process now proceeds in such a way that the output tube 10 by means of the inductor 6 is heated in a narrow strip over the circumference. The at the front End mounted clamping element 7 is connected to a bending arm 8, the is pivoted slowly according to the feed. Act through the swing Forces on the heated narrow strip of the output tube 10 and force it to follow the curved path defined by the bending radius R.

Um den in den Figuren 1 und 2 dargestellten Effekt einer Ovalisierung entgegenzuwirken ist erfindungsgemäß hinter dem Induktor 6 ein Gerüst 11 angeordnet. In diesem Ausführungsbeispiel ist es mit drei, vorzugsweise hydraulisch anstellbaren, Druckrollen 14, 14', 14" (siehe Figur 4) bestückt. Vorzugsweise haben die Druckrollen 14, 14', 14" im Querschnitt gesehen eine Diaboloform.In order to counteract the effect of ovalization shown in FIGS. 1 and 2 , according to the invention a framework 11 is arranged behind the inductor 6. In this exemplary embodiment, it is equipped with three, preferably hydraulically adjustable, pressure rollers 14, 14 ', 14 "(see FIG. 4 ). Preferably, the pressure rollers 14, 14', 14" have a diaboloform in cross-section.

Andeutungsweise sind die die Anstellung der Druckrollen betätigenden Hydraulikaggregate 12, 13, 13' dargestellt. Sie sind in diesem Ausführungsbeispiel so angeordnet, dass in der Y-Achse zwei 13, 13' näherungsweise einander gegenüber liegen und in der X-Achse sich ein Hydraulikaggregat 12 im Druckzonenbereich befindet. Die an den Hydraulikaggregaten 13, 13' eingezeichneten Umfangspfeile sollen die Möglichkeit andeuten, die optimale Position variabel einstellen zu können. Andeutungsweise are the employment of the pressure rollers actuated hydraulic units 12, 13, 13 'shown. They are arranged in this embodiment that in the Y-axis two 13, 13 'are approximately opposite each other and in the X-axis a hydraulic unit 12 is located in the pressure zone area. The on the hydraulic units 13, 13 'drawn circumferential arrows are intended to indicate the possibility of optimal To be able to adjust the position variably.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

Nr.No. Bezeichnungdescription 11 idealer Rohrquerschnittideal pipe cross-section 22 gebogener Rohrquerschnittcurved pipe cross-section 33 Wanddicke ZugzoneWall thickness tension zone 44 Wanddicke DruckzoneWall thickness pressure zone 55 Induktivbiegeanlageinductive bending 66 Induktorinductor 77 Klemmelementclamping element 88th Biegearmbending arm 99 Drehpunktpivot point 1010 Ausgangsrohroutlet pipe 1111 Gerüstframework 1212 Hydraulikaggregathydraulic power unit 13, 13'13, 13 ' Hydraulikaggregathydraulic power unit 14, 14', 14"14, 14 ', 14 " Druckrollenpressure rollers

Claims (11)

  1. Method for induction-bending of pipes, in particular large pipes, on an induction-bending unit in which, during the bending process, a pressure, which acts on the pipe, is exerted directly after the heating zone,
    characterised in that
    the arc portion respectively, which is leaving the heating zone, is guided with force in a plane, which has selected the largest ovality to be expected, at at least two positions of the circumference to the nominal outer diameter of the pipe arc, the plane intersecting the centre of rotation of the bending arm (8) of the induction-bending unit in the rear extension.
  2. Method according to claim 1,
    characterised in that
    the guiding force is exerted for the first time when the first arc portion has achieved an arc extension which is required for application of a guiding means.
  3. Method according to claim 1 and 2,
    characterised in that
    the guiding force is exerted at two positions of the circumference which are situated opposite each other.
  4. Method according to claim 3,
    characterised in that
    the plane of the guiding force coincides nearly with the perpendicular bending plane.
  5. Method according to claim 1 and 2,
    characterised in that
    the guiding force is exerted at three positions which are disposed distributed over the circumference.
  6. Method according to claim 5,
    characterised in that
    the third position of the guiding force lies in the horizontal bending plane in the pressure zone region.
  7. Method according to one of the claims 1 to 6,
    characterised in that
    the number, the position and the spacings of the positions of the guiding force are determined by estimation or calculation.
  8. Device for implementing the method according to claim 1, having a water-cooled inductor (6), a bending arm (8) and a frame (11), which is disposed behind the inductor, in which continuously radially adjustable pressure rollers (14, 14', 14") are mounted,
    characterised in that
    at least two pressure rollers (14, 14', 14"), which are displaceable in the circumferential direction, are disposed, said rollers being adjustable rigidly to a prescribable spacing during the bending process.
  9. Device according to claim 8,
    characterised in that
    two pressure rollers are provided which are situated opposite each other.
  10. Device according to claim 8 and 9,
    characterised in that
    the adjustment device for the pressure rollers is provided with a limit stop.
  11. Device according to claim 9,
    characterised in that
    the displacement of the two pressure rollers, which are situated opposite each other, is connected mutually.
EP03090269A 2002-08-27 2003-08-26 Method and device for induction-bending of pipes Expired - Lifetime EP1393832B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10240341A DE10240341A1 (en) 2002-08-27 2002-08-27 Method and device for inductively bending pipes
DE10240341 2002-08-27

Publications (2)

Publication Number Publication Date
EP1393832A1 EP1393832A1 (en) 2004-03-03
EP1393832B1 true EP1393832B1 (en) 2005-03-23

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EP (1) EP1393832B1 (en)
AT (1) ATE291504T1 (en)
DE (2) DE10240341A1 (en)
ES (1) ES2236664T3 (en)
PL (1) PL204409B1 (en)

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CN103447360A (en) * 2013-08-26 2013-12-18 河南省驰源石油化工机械有限公司 Device for producing arc-shaped steel pipes

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CN103170810B (en) * 2013-04-17 2015-03-25 二重集团（德阳）重型装备股份有限公司 Bead-welding method of inner wall of 90-degree bent pipe
CN104097017B (en) * 2014-07-26 2016-08-24 唐山开元特种焊接设备有限公司 A kind of bend pipe built-up welder
CN104690117B (en) * 2015-03-27 2017-03-01 华电重工股份有限公司 The especially big radius elbow of large diameter thick wall steel pipe and its forming method
DE102015106571A1 (en) * 2015-04-28 2016-11-03 AWS Schäfer Technologie GmbH Method for induction bending forming of a pressure-resistant pipe with large wall thickness and large diameter and induction tube bending device
CN109047379B (en) * 2018-10-11 2024-03-08 浙江工业大学之江学院 Quick detection mechanism for ovality of cross section of space bent pipe
CN112372318B (en) * 2020-11-05 2021-10-15 湖南翰坤实业有限公司 Bending forming device for rectangular frame

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CN103447360A (en) * 2013-08-26 2013-12-18 河南省驰源石油化工机械有限公司 Device for producing arc-shaped steel pipes

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ATE291504T1 (en) 2005-04-15
PL361869A1 (en) 2004-03-08
ES2236664T3 (en) 2005-07-16
EP1393832A1 (en) 2004-03-03
DE10240341A1 (en) 2004-03-18
DE50300381D1 (en) 2005-04-28

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