EP1265719B1 - Use of pipes consisting of titanium zinc conforming to en 988 and a bending method for producing pipe bends - Google Patents

Use of pipes consisting of titanium zinc conforming to en 988 and a bending method for producing pipe bends Download PDF

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Publication number
EP1265719B1
EP1265719B1 EP01925482A EP01925482A EP1265719B1 EP 1265719 B1 EP1265719 B1 EP 1265719B1 EP 01925482 A EP01925482 A EP 01925482A EP 01925482 A EP01925482 A EP 01925482A EP 1265719 B1 EP1265719 B1 EP 1265719B1
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EP
European Patent Office
Prior art keywords
pipe
bending
pipes
titanium zinc
steel
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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.)
Expired - Lifetime
Application number
EP01925482A
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German (de)
French (fr)
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EP1265719A2 (en
Inventor
Frank-Ulrich Dyllus
Martin Binkowski
Hans-Jürgen KLUGSTEDT
Ulrich Lachenit
Marianne SCHÖNNENBECK
Adolf Stradmann
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Rheinzink GmbH and Co KG
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Rheinzink GmbH and Co KG
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Application filed by Rheinzink GmbH and Co KG filed Critical Rheinzink GmbH and Co KG
Priority to DK01925482T priority Critical patent/DK1265719T3/en
Publication of EP1265719A2 publication Critical patent/EP1265719A2/en
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Publication of EP1265719B1 publication Critical patent/EP1265719B1/en
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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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/05—Bending tubes using mandrels or the like co-operating with forming members
    • B21D9/07—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only
    • B21D9/073—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only with one swinging forming member

Definitions

  • the invention further relates to a method for Bending of titanium zinc to EN 988 existing pipes with a nominal diameter between 90 and 150 mm to pipe bends with a bending angle between 30 ° and 90 °, with a parallel weld welded to the tube axis and are intended in particular for downpipes according to EN 612 are, with a pipe bender, as they are known for bending steel pipes, with the titanium zinc according to EN 988 anisotropic in a sense that the ratio of width to thickness change, compared with steel, relatively low and the existing weld of the output tube during bending in the area of unstretched layer lies.
  • the initial thickness of the downpipes according to EN 612 is from Nominal diameters between 50 and 150 mm between 0.65 and 1.2 mm. As typical values for a pipe bend with a bending angle of 60 °, a bending radius of 175 mm at a Metal thickness of 0.7 mm to 1 mm are assumed. After Bending forms a range of 0.6 to 1.5 mm the range of Metal thickness for thin-walled metal sheet bends.
  • the tube is clamped at one end with a clamping device.
  • the clamping device has an inner core 1 and outer Jaws 2 on. The clamping takes place only on a length of about 50 mm.
  • a piston rod 3 is guided, which is pushed both as well as can be pulled on and a Biegeinnendorn 4 is attached.
  • the piston rod with the internal bending mandrel is inside the tube.
  • the tube to be bent is also on clamped at the other end. This is in the present case inside introduced a spreading segment and mechanically spread.
  • the tube From the outside, the tube by closing a jaw. 6 clamped between the jaw and the bending mold 7.
  • the Combination of jaw and bending mold revolves around the Axis of the bending shaft 8 and thus bends the pipe.
  • the spreading segment prevents the tube from falling.
  • the bending mandrel 4 inside the tube consists of several, preferably 2 to 6 members. He should prevent the pipe during of bending or folding wrinkles.
  • a wrinkle smoothing shoe 9 is provided, which has the task, the to close tangential transition from the tube to the bending roller 7 and to prevent wrinkling.
  • a sliding segment 10 is supported the flow of material during bending on the outside of the pipe. With the help of a hydraulic cylinder 11 can via the piston rod 3 a lead or lag of the mandrel 7 are set.
  • the length of the tube can also be chosen that only a single pipe bend is created.

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

Abstract

The invention relates to the use of pipes consisting of titanium zinc conforming to EN 988 and to a method for bending pipes with a diameter of between 50 and 200 mm and an initial thickness of between 0.65 and 1.2 mm that consist of titanium zinc conforming to EN 988. Said pipes are butt-welded, using a weld seam that runs parallel to the pipe axis and are used as an intermediate product for bending into pipe bends with a bending angle of between 30 and 90 DEG . The pipe bends are butt-welded, using a weld seam that runs parallel to the pipe axis and are designed, in particular, for use as rainwater downpipes which conform to EN 612.

Description

Die Erfindung betrifft die Verwendung von aus Titanzink nach EN 988 bestehenden Rohren mit einem Nenndurchmesser zwischen 50 und 150 mm, sowie ein Verfahren zum Biegen derartiger Rohre zu Rohrbögen. (EN = Europäische Norm)The invention relates to the use of titanium zinc after EN 988 existing pipes with a nominal diameter between 50 and 150 mm, and a method for bending such pipes to pipe bends. (EN = European standard)

Es ist bekannt, aus Stahlblech bestehende Rohre mit Hilfe verschiedener Verfahren zu Rohrbögen mit einem Biegewinkel zwischen 30° und 90° zu biegen. Dabei ist bekannt, daß Stahlblech ein Verhältnis B des Verhältnisses von Breiten- zu Dikkenformänderung von etwa 1,7 hat. Das Verhältnis B wird zur Charakterisierung der Fließfähigkeit eines Materials herangezogen, wobei sich das Verhältnis B von Breiten- zu Dickenformänderung im Zugversuch ergibt.It is known to use sheet steel pipes with the help various methods to pipe bends with a bending angle between 30 ° and 90 °. It is known that steel sheet a ratio B of the ratio of width to thickness change of about 1.7. The ratio B becomes Characterization of the flowability of a material used, where the ratio B of width to thickness change in the tensile test results.

Bei Stahl liegt dieser Wert bei etwa 1,7, während er für Titanzink nach EN 988 nur bei 0,4 liegt. Das bedeutet, daß Titanzink eher aus der Blechdicke als aus der Blechebene fließt. Aufgrund dieser Tatsache galt es bisher als technisch nicht durchführbar, Rohre aus Titanzink nach EV 988 zu Rohrbögen umzuformen. Daher wurden bisher Rohrbögen aus Titanzink nach EN 988 insbesondere als Zubehör für Regenfallrohre nach EN 612 aus zwei tiefgezogenen Platinen gefertigt, die überlappend durch Schweißen oder Löten verbunden wurden.For steel, this value is around 1.7, while for Titanium zinc according to EN 988 is only 0.4. It means that Titanium zinc rather from the sheet thickness than from the sheet metal plane flows. Because of this fact, it was previously considered technical not feasible, pipes made of titanium zinc to EV 988 to pipe bends reshape. Therefore, so far pipe bends were made of titanium zinc according to EN 988 especially as an accessory for downpipes EN 612 made of two deep-drawn blanks, overlapping were joined by welding or soldering.

Es stellt sich daher die Aufgabe, das Biegen von Rohrbögen abweichend von der bisher vorgezogenen Verwendung von Stahl auch mit Titanzink nach EN 988 durchzuführen. It is therefore the task of bending pipe bends Deviating from the previously preferred use of steel also with titanium zinc according to EN 988.

Diese Aufgabe wird gelöst durch die Verwendung von aus Titanzink nach EN 988 bestehenden Rohren mit einem Nenndurchmesser zwischen 50 und 150 mm, die mit einer parallel zur Rohrachse verlaufenden Schweißnaht stumpf geschweißt sind und die insbesondere für Regenfallrohre nach EN 612 bestimmt sind, als Zwischenprodukt zum Biegen zu Rohrbögen mithilfe einer Rohrbiegevorrichtung, wie sie an sich für Stahlrohrbögen bekannt ist, wobei das Titanzink nach EN 988 sich anisotrop in einem Sinn verhält, daß das Verhältnis von Breiten- zu Dickenformänderung B, verglichen mit Stahl, relativ niedrig liegt und die vorhandene Schweißnaht des Ausgangsrohres im Bereich der ungelängten Schicht liegt.This problem is solved by the use of titanium zinc according to EN 988 existing pipes with a nominal diameter between 50 and 150 mm, with one parallel to the tube axis extending weld are butt welded and in particular for downpipes according to EN 612, as Intermediate for bending to pipe bends by means of a pipe bender, as they are known for steel pipe bends is, wherein the titanium zinc according to EN 988 is anisotropic in a It makes sense that the ratio of width to thickness change B, compared to steel, is relatively low and the existing weld of the outlet pipe in the area of unstretched layer lies.

Die Erfindung bezieht sich weiterhin auf ein Verfahren zum Biegen von aus Titanzink nach EN 988 bestehenden Rohren mit einem Nenndurchmesser zwischen 90 und 150 mm zu Rohrbögen mit einem Biegewinkel zwischen 30° und 90°, die mit einer parallel zur Rohrachse verlaufenden Schweißnaht stumpf geschweißt sind und die insbesondere für Regenfallrohre nach EN 612 bestimmt sind, mit einer Rohrbiegevorrichtung, wie sie an sich für das Biegen von Stahlrohren bekannt ist, wobei das Titanzink nach EN 988 sich anisotrop in einen Sinn verhält, daß das Verhältnis von Breiten- zu Dickenformänderung, verglichen mit Stahl, relativ niedrig liegt und die vorhandene Schweißnaht des Ausgangsrohres während des Biegens im Bereich der ungelängten Schicht liegt.The invention further relates to a method for Bending of titanium zinc to EN 988 existing pipes with a nominal diameter between 90 and 150 mm to pipe bends with a bending angle between 30 ° and 90 °, with a parallel weld welded to the tube axis and are intended in particular for downpipes according to EN 612 are, with a pipe bender, as they are known for bending steel pipes, with the titanium zinc according to EN 988 anisotropic in a sense that the ratio of width to thickness change, compared with steel, relatively low and the existing weld of the output tube during bending in the area of unstretched layer lies.

Die Ausgangsdicke der Regenfallrohre nach EN 612 liegt von Nenndurchmessern zwischen 50 und 150 mm zwischen 0,65 und 1,2 mm. Als typische Werte für einen Rohrbogen mit einem Biegewinkel von 60° können ein Biegeradius von 175 mm bei einer Metalldicke von 0,7 mm bis 1 mm angenommen werden. Nach der Biegung bildet ein Bereich von 0,6 bis 1,5 mm den Bereich der Metalldicke für dünnwandige Blechrohrbögen. The initial thickness of the downpipes according to EN 612 is from Nominal diameters between 50 and 150 mm between 0.65 and 1.2 mm. As typical values for a pipe bend with a bending angle of 60 °, a bending radius of 175 mm at a Metal thickness of 0.7 mm to 1 mm are assumed. After Bending forms a range of 0.6 to 1.5 mm the range of Metal thickness for thin-walled metal sheet bends.

Für den Fachmann sind Verfahren bekannt, derartige Rohre aus Stahlblech zu einem Rohrbogen umzuformen (vgl. W.D. FRANZ: Das Kalt-Biegen von Rohren; Springer-Verlag, 1961). Vorzugsweise wird ein Rohrbiegeverfahren, bei dem das Rohr unter Verwendung eines Dorns gebogen wird. Durch einen zusätzlichen Innendruck kann die Umformung erleichtert und mittels Schmiermittel die Reibung zwischen Dorn und Rohr vermindert werden. Dieses an sich bekannte Verfahren läßt sich mit besonderem Vorteil auf Rohre aus Titanzink nach EN 988 anwenden.For the expert methods are known, such pipes To convert steel sheet into a pipe bend (see W.D. FRANZ: Cold bending of pipes; Springer-Verlag, 1961). Preferably is a pipe bending process in which the pipe under Using a mandrel is bent. By an additional Internal pressure can facilitate the transformation and by means of Lubricant reduces the friction between mandrel and pipe become. This method known per se can be with special Take advantage of titanium zinc pipes according to EN 988.

Ein Ausführungsbeispiel des Verfahrens wird anhand der Figur, die eine Rohrbiegemaschine mit dazu gehörigen Austattungselementen zeigt, wie folgt beschrieben:An embodiment of the method is based on the figure, a pipe bending machine with associated Austattungselementen shows as follows:

Mit Hilfe einer handelsüblichen Rohrbiegemaschine (Beispiel: Bernd Master BM 120 IMS der Firma PEDRAZZOLI IBP SpA, Bassano del Grappa, Italien) wird ein Titanzink-Rohr mit einem Nenndurchmesser von 100 mm, das eine stumpf geschweißte Längsnaht besitzt, zu einer fortlaufenden Folge von aneinander hängenden Rohrstücken gebogen. Die Rohrwanddicke beträgt 1,0 mm.With the help of a standard tube bending machine (example: Bernd Master BM 120 IMS of the company PEDRAZZOLI IBP SpA, Bassano del Grappa, Italy) becomes a titanium zinc tube with a nominal diameter of 100 mm, which is a butt welded longitudinal seam possesses, to a continuous succession of hanging ones Pipe pieces bent. The pipe wall thickness is 1.0 mm.

Das Rohr wird an einem Ende mit einer Klemmvorrichtung eingespannt. Die Klemmvorrichtung weist einen Innenkern 1 und äußere Klemmbacken 2 auf. Die Einspannung erfolgt lediglich auf einer Länge von etwa 50 mm. Durch den Innenkern der Klemmvorrichtung ist eine Kolbenstange 3 geführt, die sowohl geschoben als auch gezogen werden kann und an der ein Biegeinnendorn 4 befestigt ist. Die Kolbenstange mit dem Biegeinnendorn befindet sich im Inneren des Rohres.The tube is clamped at one end with a clamping device. The clamping device has an inner core 1 and outer Jaws 2 on. The clamping takes place only on a length of about 50 mm. Through the inner core of the clamping device a piston rod 3 is guided, which is pushed both as well as can be pulled on and a Biegeinnendorn 4 is attached. The piston rod with the internal bending mandrel is inside the tube.

Vor dem ersten Biegevorgang wird das zu biegende Rohr auch am anderen Ende eingespannt. Dazu wird im vorliegenden Fall innen ein Spreizsegment eingeführt und mechanisch gespreizt. Before the first bending process, the tube to be bent is also on clamped at the other end. This is in the present case inside introduced a spreading segment and mechanically spread.

Von außen wird das Rohr durch Schließen einer Spannbacke 6 zwischen der Spannbacke und der Biegeform 7 eingeklemmt. Die Kombination von Spannbacke und Biegeform dreht sich um die Achse der Biegewelle 8 und biegt damit das Rohr. Das Spreizsegment verhindert dabei, daß das Rohr einfällt. Der Biegedorn 4 im Inneren des Rohres besteht aus mehreren, vorzugsweise 2 bis 6 Gliedern. Er soll verhindern, daß das Rohr während des Biegens einfällt oder Falten wirft. Weiterhin ist ein Faltenglättschuh 9 vorhanden, der die Aufgabe hat, den tangentialen Übergang vom Rohr zur Biegerolle 7 zu schließen und eine Faltenbildung zu verhindern. Ein Gleitsegment 10 unterstützt das Nachfließen des Materials während des Biegens an der Außenseite des Rohres. Mit Hilfe eines Hydraulikzylinders 11 kann über die Kolbenstange 3 eine Vor- oder Nacheilung des Biegedorns 7 eingestellt werden.From the outside, the tube by closing a jaw. 6 clamped between the jaw and the bending mold 7. The Combination of jaw and bending mold revolves around the Axis of the bending shaft 8 and thus bends the pipe. The spreading segment prevents the tube from falling. The bending mandrel 4 inside the tube consists of several, preferably 2 to 6 members. He should prevent the pipe during of bending or folding wrinkles. Furthermore is a wrinkle smoothing shoe 9 is provided, which has the task, the to close tangential transition from the tube to the bending roller 7 and to prevent wrinkling. A sliding segment 10 is supported the flow of material during bending on the outside of the pipe. With the help of a hydraulic cylinder 11 can via the piston rod 3 a lead or lag of the mandrel 7 are set.

Nach dem ersten Biegevorgang werden die Spannbacke 6 und das Gleitsegment radial zurückgefahren. Die Biegeform schwenkt in die Ausgangslage zurück. Über den Hydraulikzylinder 11 wird außerdem der Biegedorn in seine Ausgangslage zurückgezogen. Das Rohr wird über die hintere Einspannung 1,2 axial um 180° gedreht. Der Biegevorgang wiederholt sich, so daß ein weiterer Rohrabschnitt entsteht. Das Spreizsegment wird nur beim jeweils ersten Biegevorgang eines jeden Rohres benötigt. Der Vorgang wiederholt sich, bis das Ausgangsrohr komplett abgearbeitet ist. Das wiederholt gebogene Rohr wird anschließend in passende Rohrstücke geschnitten.After the first bending operation, the jaw 6 and the Sliding back segment radially. The bending mold swings in the starting position back. About the hydraulic cylinder 11 is In addition, the bending mandrel is retracted to its original position. The tube is 180 ° axially over the rear clamping 1.2 turned. The bending process is repeated, so that another Pipe section is created. The spreading segment is only at each first bending process of each tube needed. Of the The process is repeated until the starting tube has been completely processed is. The repeatedly bent tube is then cut into matching pieces of pipe.

Wahlweise kann die Länge des Rohres auch so gewählt werden, daß nur ein einziger Rohrbogen entsteht.Optionally, the length of the tube can also be chosen that only a single pipe bend is created.

Claims (5)

  1. Use of pipes consisting of titanium zinc to EN 988, with a nominal diameter of between 50 and 150 mm and an initial thickness of 0.65 to 1.2 mm, which are butt welded with a weld seam extending parallel to the pipe axis and which are intended particularly for rainwater pipes to EN 612, as an intermediate product for bending to form pipe bends with a pipe bending device of the kind known per se for steel pipe bends, wherein the titanium zinc to EN 988 behaves anisotropically inasmuch as the ratio of the width to thickness change of shape is relatively low compared with steel and the weld seam of the initial pipe is situated in the region of the unstretched layer.
  2. A method of bending pipes consisting of titanium zinc to EN 988, with a nominal diameter of between 50 and 200 mm, to form pipe bends with a bend angle of between 30 and 90°, which are butt welded with a weld seam extending parallel to the pipe axis and which are intended particularly for rainwater pipes to EN 612, with a pipe bending device of the kind known per se for bending steel pipes, the titanium zinc to EN 988 behaving anisotropically inasmuch as the ratio of width to thickness change of shape is relatively low compared with steel and the weld seam in the initial pipe during bending is situated in the region of the unstretched layer.
  3. Use and method according to claim 1 or 2, characterised in that the end thickness of the bent pipe bend meets the requirements of EN 612 for accessory parts consisting of titanium zinc to EN 988.
  4. A method according to claim 2 or 3, characterised in that during the bending operation the pipe for bending is kept at a substantially constant temperature between 20°C and 250°C.
  5. A method according to claims 2 to 4, characterised in that friction between the mandrel and the pipe is prevented by the use of lubricant.
EP01925482A 2000-03-23 2001-03-16 Use of pipes consisting of titanium zinc conforming to en 988 and a bending method for producing pipe bends Expired - Lifetime EP1265719B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK01925482T DK1265719T3 (en) 2000-03-23 2001-03-16 Use of tubes and titanium zinc according to EN 988 and bending method for the manufacture of tube bends

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10014519 2000-03-23
DE10014519A DE10014519A1 (en) 2000-03-23 2000-03-23 Use of pipes made of titanium zinc according to EN 988 and bending processes for the production of pipe bends
PCT/EP2001/003060 WO2001070426A2 (en) 2000-03-23 2001-03-16 Use of pipes consisting of titanium zinc conforming to en 988 and a bending method for producing pipe bends

Publications (2)

Publication Number Publication Date
EP1265719A2 EP1265719A2 (en) 2002-12-18
EP1265719B1 true EP1265719B1 (en) 2005-01-05

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EP01925482A Expired - Lifetime EP1265719B1 (en) 2000-03-23 2001-03-16 Use of pipes consisting of titanium zinc conforming to en 988 and a bending method for producing pipe bends

Country Status (6)

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EP (1) EP1265719B1 (en)
AT (1) ATE286440T1 (en)
AU (1) AU2001252217A1 (en)
DE (2) DE10014519A1 (en)
ES (1) ES2234831T3 (en)
WO (1) WO2001070426A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10156475A1 (en) * 2001-11-16 2003-06-05 Rheinzink Gmbh Process for the production of dark protective layers on flat products made of titanium zinc

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2957229A (en) * 1954-12-23 1960-10-25 Allan W Beatty Method of fabricating curved fittings
DE3709784A1 (en) * 1987-03-25 1988-10-06 Rheinzink Gmbh METHOD AND DEVICE FOR PRODUCING THIN-WALLED TUBES
DE19633423A1 (en) * 1996-08-20 1998-02-26 Rheinzink Gmbh Process for the production of thin-walled pipes
US6009737A (en) * 1997-07-17 2000-01-04 Arvin Industries, Inc. Tube bender

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Publication number Publication date
WO2001070426A3 (en) 2002-03-14
DE50105029D1 (en) 2005-02-10
EP1265719A2 (en) 2002-12-18
ATE286440T1 (en) 2005-01-15
AU2001252217A1 (en) 2001-10-03
WO2001070426A2 (en) 2001-09-27
DE10014519A1 (en) 2001-10-11
ES2234831T3 (en) 2005-07-01

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