EP1149640A2 - Bending apparatus for thin-walled metal pipes - Google Patents

Bending apparatus for thin-walled metal pipes Download PDF

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Publication number
EP1149640A2
EP1149640A2 EP01108674A EP01108674A EP1149640A2 EP 1149640 A2 EP1149640 A2 EP 1149640A2 EP 01108674 A EP01108674 A EP 01108674A EP 01108674 A EP01108674 A EP 01108674A EP 1149640 A2 EP1149640 A2 EP 1149640A2
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EP
European Patent Office
Prior art keywords
mandrel
bending device
clamping
clamping head
bending
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Granted
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EP01108674A
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German (de)
French (fr)
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EP1149640B1 (en
EP1149640A3 (en
Inventor
Thomas Dr.-Ing. Flehmig
Uwe Dipl.-Ing Kneiphoff
Dieter Scheuvens
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Stahl AG
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Publication of EP1149640A3 publication Critical patent/EP1149640A3/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
    • B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length

Definitions

  • the invention relates to a bending device for thin-walled metal pipes from a straight pipe guide, one adjoining and opposite the Pipe guide with swiveling core template Terminal strip, and a mandrel, the mandrel shaft (5) and a mandrel part that is flexible in the area of the core template which is connected to the Mandrel shaft is spring-loaded.
  • Bending devices of this and similar types are known (Journal “Werkstatt und strig 104 (1971) 4, pages 271 to 274 "," Prevention of Wrinkles and Bending of thin-walled tubes when bending "by Prof. Dr.-Ing. G. ⁇ hler, Bad Dürkheim).
  • Thin-walled means in this context pipes, their wall thickness based on the diameter and the bending radius small is, e.g. B. Pipes with a wall thickness of approximately 0.8 mm a diameter of approx. 80 mm and a bending radius of approx. 120 mm.
  • a bending device of the type mentioned Art known (DE 197 07 228 A1), but not for thin-walled pipes in the sense described above, but for Pipes with very small diameters is determined.
  • This bending device consists of the flexible mandrel part several spherical joint members, which together with the Mandrel shaft resilient by means of the inner tension rope are tense.
  • This bending device that becomes bending pipe in the not to be bent before the flexible section of the mandrel lying only from the outside between the core template and the terminal block clamped.
  • the mandrel is not taken, but is axially fixed. You would try thin-walled with such a bending device To bend pipes, then the pipe would be due to the necessary large radial clamping forces radially be pushed in.
  • the invention has for its object a To create bending device of the type mentioned in the introduction, the one with a short clamping length of the pipe start gets along and the making a curvature with over the entire length allows circular cross-section.
  • the mandrel as flexible mandrel part has a coil spring that axially between a spherical clamping head and the Mandrel shaft is arranged, the tube to be bent between the clamping head and the core template with their Terminal block can be clamped non-positively.
  • the Clamping head firmly clamps the beginning of the pipe relatively short length because of the spherical shape of the clamping head has a high clamping force can be easily applied. Because in the area of If there is no bend at the beginning of the pipe, this plays here Constriction problem as in the prior art with spherical inserts used in the bending area Joint members, occurs, does not matter.
  • the coil spring should unbent condition at least on the outside a smooth form cylindrical support surface.
  • the axial preload of the coil spring can be adjust that the pressure piece on a Compression spring is supported, which in turn on a Tensioning cable is supported.
  • the clamping head can be made from a slotted Outer ring and an inner support and clamping cone consist of the self-tensioning on the bending process Outer ring works. This alternative is based on the Pulling force exerted on the tube during the bending process Tension ring and the tension cone transferred and in the sense an expansion of the outer ring and thus a firmer Clamping effect exploited, while that of the traction device Return the clamping head exerted force in the sense of solution works.
  • the clamping head can also be made from consist of several, in particular two spherical links, which form a rigid structural unit. Because of the middle Constriction and rounding also occurs in this If there is no jamming in the elbow when Withdraw the clamping head. This solution stands out with a simple construction, especially by a optimal guidance and particularly good Post-profiling properties.
  • this runs Tensioning rope eccentrically through the tube on the inner arch along. This ensures that the section of the pipe to be bent firmly against the Inside of the inner coil of the coil spring pressed becomes.
  • the bending device consists of a fixed one straight pipe guide 1, an adjoining pivotable core template 2 with a terminal strip 3 and one arranged in the area of the core template 2 Mandrel 4 with it in the area of Pipe guide 1 located mandrel shaft 5.
  • the mandrel 4 consists of a flexible mandrel part 4a in the form of a Coil spring and a spherical clamping head 4b preferably two spherical limbs that are rigid Form unit.
  • the flexible part 4a of the mandrel 4 Clamping head 4b and the mandrel shaft 5 are axially over one Tensioning rope 6 biased with head piece 6a. This is what a between the mandrel shaft 5 and a tensioning screw 7 attached to the tensioning cable 6 arranged compression spring 8.
  • the tension cable 6 engages Tension element 9, via which the mandrel 3 after Bending process can be withdrawn.
  • the operation of the bending device according to the invention is the following:
  • Figure 2 differs of that of Figure 1 only in the clamping head. So far Correspondences exist, are the same reference numerals used for the individual parts as in Figure 1.
  • the tensioning head 14 consists of a slotted, spherical outer ring 14a and a support and tensioning cone 14b, on which the spring-loaded head piece 6a of the inner tensioning cable 6 acts.
  • the operation of the bending device of the embodiment of Figure 2 largely corresponds to that of the embodiment of Figure 1, so that only the different effect of the clamping head is discussed:

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

Abstract

The pipe bending device has a straight pipe guide (1) leading to a relatively pivoted bending block (2) provided with a clamp rail (3) and a flexible thorn (4) with a thorn shaft (5) inserted in the end of the pipe. The flexible thorn is provided by a coil spring (4a) and a spherical clamp head (4b), with an internal tensioning cable (6) used for axially tensioning the clamp head, the coil spring and the thorn shaft.

Description

Die Erfindung betrifft eine Biegevorrichtung für dünnwandige Metallrohre aus einer geraden Rohrführung, einer sich daran anschließenden und gegenüber der Rohrführung verschwenkbaren Kernschablone mit Klemmleiste, und einem Dorn, der einen Dornschaft (5) und einen im Bereich der Kernschablone biegsamen Dornteil aufweist, der mittels eines inneren Spannseilsmit dem Dornschaft federelastisch verspannt ist.The invention relates to a bending device for thin-walled metal pipes from a straight pipe guide, one adjoining and opposite the Pipe guide with swiveling core template Terminal strip, and a mandrel, the mandrel shaft (5) and a mandrel part that is flexible in the area of the core template which is connected to the Mandrel shaft is spring-loaded.

Biegevorrichtungen dieser und ähnlicher Art sind bekannt (Zeitschrift "Werkstatt und Betrieb 104 (1971) 4, Seiten 271 bis 274", "Verhinderung von Faltenbildung und Einknicken dünnwandiger Rohre beim Biegen" von Prof. Dr.-Ing. G. Öhler, Bad Dürkheim). Unter "dünnwandig" versteht man in diesem Zusammenhang Rohre, deren Wandstärke bezogen auf den Durchmesser und den Biegeradius klein ist, z. B. Rohre mit einer Wandstärke von ca. 0,8 mm bei einem Durchmesser von ca. 80 mm und einem Biegeradius von ca. 120 mm. Um die beim Biegen solcher Rohre mit kleinem Biegeradius auftretenden Probleme der Faltenbildung und der Abweichung vom Kreisprofil möglichst klein zu halten, hat man das Rohr an seiner Innenwand im Biegebereich von innen auf verschiedenene Art und Weise abgestützt. So gibt es abstützende Dorne in Form von Schraubenfedern mit eng aneinanderliegenden Windungen oder Gliederdorne aus kugeligen Gelenkgliedern. Beide Arten von Dornen haben den Nachteil, daß sie das zu biegende Rohr nicht vollflächig abstützen. Bei Gliederdornen aus kugeligen Gelenkgliedern sind von Anfang an sowohl am Innenbogen als auch am Außenbogen Lücken vorhanden. Bei einer Schraubenfeder, die außen überschliffen sein kann, ergeben sich am Außenbogen mit zunehmender Biegung größer werdende Lücken.Bending devices of this and similar types are known (Journal "Werkstatt und Betrieb 104 (1971) 4, pages 271 to 274 "," Prevention of Wrinkles and Bending of thin-walled tubes when bending "by Prof. Dr.-Ing. G. Öhler, Bad Dürkheim). Under "thin-walled" means in this context pipes, their wall thickness based on the diameter and the bending radius small is, e.g. B. Pipes with a wall thickness of approximately 0.8 mm a diameter of approx. 80 mm and a bending radius of approx. 120 mm. To the when bending such pipes with small Problems of wrinkling and bending occurring to keep the deviation from the circular profile as small as possible, you have the tube on its inner wall in the bending area of supported on the inside in various ways. So there are supporting mandrels in the form of coil springs close to each other turns or arbors spherical joint members. Have both types of thorns the disadvantage that they are not the pipe to be bent fully support. Spherical arbors Articulated links are on the inner arch from the start as well as gaps on the outer arch. At a Coil spring, which can be ground on the outside, arise on the outer arch larger with increasing bend becoming gaps.

Ein weiteres Problem bei den bekannten Biegevorrichtungen besteht in der Einspannung des Rohranfanges. Die Abstützung auf einem starren zylindrischen Dornkopf ist problematisch, weil sich ein solcher Dornkopf, der für eine feste Einspannung des Rohres eine verhältnismäßig große Einspannlänge benötigt, nicht durch das gebogene Rohr zurückziehen läßt.Another problem with the known bending devices consists of clamping the start of the pipe. The It is supported on a rigid cylindrical mandrel head problematic because there is such a mandrel head, which for a firm clamping of the pipe is a relative large clamping length required, not due to the curved Tube can be withdrawn.

Ferner ist eine Biegevorrichtung der eingangs genannten Art bekannt (DE 197 07 228 A1), die allerdings nicht für dünnwandige Rohre im vorbeschriebenen Sinn, sondern für Rohre mit sehr kleinen Durchmessern bestimmt ist. Bei dieser Biegevorrichtung besteht der biegsame Dornteil aus mehreren kugeligen Gelenkgliedern, die gemeinsam mit dem Dornschaft mittels des inneren Spannseils federelastisch verspannt sind. Bei dieser Biegevorrichtung wird das zu biegende Rohr in dem nicht zu biegenden, vor dem biegsamen Dornteil liegenden Abschnitt nur von außen zwischen der Kernschablone und der Klemmleiste eingespannt. Beim Biegevorgang wird der Dorn nicht mitgenommen, sondern ist axial fixiert. Würde man versuchen, mit einer solchen Biegevorrichtung dünnwandige Rohre zu biegen, dann würde das Rohr infolge der notwendigen großen radialen Einspannkräfte radial eingedrückt werden.Furthermore, a bending device of the type mentioned Art known (DE 197 07 228 A1), but not for thin-walled pipes in the sense described above, but for Pipes with very small diameters is determined. At this bending device consists of the flexible mandrel part several spherical joint members, which together with the Mandrel shaft resilient by means of the inner tension rope are tense. With this bending device that becomes bending pipe in the not to be bent before the flexible section of the mandrel lying only from the outside between the core template and the terminal block clamped. During the bending process, the mandrel is not taken, but is axially fixed. You would try thin-walled with such a bending device To bend pipes, then the pipe would be due to the necessary large radial clamping forces radially be pushed in.

Der Erfindung liegt die Aufgabe zugrunde, eine Biegevorrichtung der eingangs genannten Art zu schaffen, die mit einer kurzen Einspannlänge des Rohranfanges auskommt und die die Herstellung einer Krümmung mit über die gesamte Länge kreisförmigem Querschnitt erlaubt.The invention has for its object a To create bending device of the type mentioned in the introduction, the one with a short clamping length of the pipe start gets along and the making a curvature with over the entire length allows circular cross-section.

Diese Aufgabe wird mit einer Biegevorrichtung der eingangs genannten Art dadurch gelöst, daß der Dorn als biegsamen Dornteil eine Schraubenfeder aufweist, die axial zwischen einem kugeligen Spannkopf und dem Dornschaft angeordnet ist, wobei das zu biegende Rohr zwischen dem Spannkopf und der Kernschablone mit ihrer Klemmleiste kraftschlüssig einklemmbar ist.This task is accomplished with a bending device type mentioned solved in that the mandrel as flexible mandrel part has a coil spring that axially between a spherical clamping head and the Mandrel shaft is arranged, the tube to be bent between the clamping head and the core template with their Terminal block can be clamped non-positively.

Bei der erfindungsgemäßen Biegevorrichtung ermöglicht der Spannkopf eine feste Einspannung des Rohranfanges auf verhältnismäßig kurzer Länge, weil sich wegen der kugeligen Form des Spannkopfes eine hohe Klemmkraft problemlos aufbringen läßt. Da im Bereich des Rohranfanges eine Biegung nicht erfolgt, spielt hier das Problem der Einschnürung, wie es beim Stand der Technik mit im Biegebereich eingesetzten, kugeligen Gelenkgliedern, auftritt, keine Rolle. Die kugelige Form des Spannkopfes erlaubt es allerdings, daß der Spannkopf über das gekrümmte Rohr ohne Klemmung zurückgezogen werden und dabei eine Glättungswirkung und Nachprofilierung insbesondere am Außenbogen des gekrümmten Bereichs ausüben kann, wo wegen der sich beim Biegevorgang leicht öffnenden Schraubenfeder die Entstehung kleiner Einschnürungen zwischen den geöffneten Windungen naturgemäß nicht vollständig verhindert werden kann. Insgesamt läßt sich also mit der erfindungsgemäßen Biegevorrichtung bei kurzer Einspannlänge des Rohranfanges ein dünnwandiges Rohr biegen, ohne daß im Endprodukt vom kreisförmigen Querschnitt abweichende Querschnitte vorhanden sind.In the bending device according to the invention, the Clamping head firmly clamps the beginning of the pipe relatively short length because of the spherical shape of the clamping head has a high clamping force can be easily applied. Because in the area of If there is no bend at the beginning of the pipe, this plays here Constriction problem as in the prior art with spherical inserts used in the bending area Joint members, occurs, does not matter. The spherical shape the chuck, however, allows the chuck retracted over the curved tube without clamping become and thereby a smoothing effect and Post-profiling, in particular on the outer arch of the can exercise curved area, where because of the when Bending process easily opening the coil spring Small constrictions develop between the open ones Naturally, turns cannot be completely prevented can. Overall, therefore, can be with the invention Bending device with a short clamping length of the Bend a thin-walled tube at the beginning of the tube without End product deviating from the circular cross section Cross sections are available.

Um sowohl am Innenbogen als auch am Außenbogen die Bildung von Falten und Einschnürungen so gering wie möglich zu halten, sollte die Schraubenfeder im ungebogenen Zustand zumindest außenseitig eine glatte zylindrische Stützfläche bilden.To ensure that both on the inner arch and on the outer arch Formation of wrinkles and constrictions as little as to keep possible, the coil spring should unbent condition at least on the outside a smooth form cylindrical support surface.

Die axiale Vorspannung der Schraubenfeder läßt sich dadurch einstellen, daß das Druckstück an einer Druckfeder abgestützt ist, die ihrerseits an einer am Spannseil widergelagerten Stellschraube abgestützt ist.The axial preload of the coil spring can be adjust that the pressure piece on a Compression spring is supported, which in turn on a Tensioning cable is supported.

Für die Ausbildung des Spannkopfes gibt es mehrere Möglichkeiten. Der Spannkopf kann aus einem geschlitzten Außenring und einem inneren Stütz- und Spannkonus bestehen, der beim Biegevorgang selbstspannend auf den Außenring wirkt. Bei dieser Alternative wird die auf das Rohr beim Biegevorgang ausgeübte Ziehkraft auf den Spannring und den Spannkonus übertragen und im Sinne einer Spreizung des Außenringes und damit einer festeren Klemmwirkung ausgenutzt, während die vom Zugmittel beim Rückholen des Spannkopfes ausgeübte Kraft im Lösungssinne wirkt. Alternativ dazu kann der Spannkopf auch aus mehreren, insbesondre zwei kugeligen Gliedern bestehen, die eine starre Baueinheit bilden. Wegen der mittigen Einschnürung und der Abrundungen kommt es auch in diesem Fall zu keinen Verklemmungen im Rohrbogen beim Zurückziehen des Spannkopfes. Diese Lösung zeichnet sich bei einfachem konstruktivem Aufbau vor allem durch eine optimale Führung und besonders gute Nachprofilierungseigenschaften aus.There are several for the design of the clamping head Possibilities. The clamping head can be made from a slotted Outer ring and an inner support and clamping cone consist of the self-tensioning on the bending process Outer ring works. This alternative is based on the Pulling force exerted on the tube during the bending process Tension ring and the tension cone transferred and in the sense an expansion of the outer ring and thus a firmer Clamping effect exploited, while that of the traction device Return the clamping head exerted force in the sense of solution works. Alternatively, the clamping head can also be made from consist of several, in particular two spherical links, which form a rigid structural unit. Because of the middle Constriction and rounding also occurs in this If there is no jamming in the elbow when Withdraw the clamping head. This solution stands out with a simple construction, especially by a optimal guidance and particularly good Post-profiling properties.

Nach einer Ausgestaltung der Erfindung verläuft das Spannseil exzentrisch durch das Rohr am Innenbogen entlang. Auf diese Art und Weise wird sichergestellt, daß der zu biegende Abschnitt des Rohres fest gegen die Innenseite des Innenbogens der Schraubenfeder gedrückt wird.According to one embodiment of the invention, this runs Tensioning rope eccentrically through the tube on the inner arch along. This ensures that the section of the pipe to be bent firmly against the Inside of the inner coil of the coil spring pressed becomes.

Im folgenden wird die Erfindung anhand einer zwei Ausführungsbeispiele darstellenden Zeichnung näher erläutert. Die Zeichnung zeigt die Biegevorrichtung nach dem Biegevorgang im axialen Halbschnitt.In the following the invention is based on a two Drawing illustrating embodiments explained. The drawing shows the bending device the bending process in the axial half section.

Die Biegevorrichtung besteht aus einer feststehenden geraden Rohrführung 1, einer sich daran anschließenden verschwenkbaren Kernschablone 2 mit einer Klemmleiste 3 und einem im Bereich der Kernschablone 2 angeordneten Dorn 4 mit sich daran anschließendem, im Bereich der Rohrführung 1 befindlichen Dornschaft 5. Der Dorn 4 besteht aus einem biegsamen Dornteil 4a in Form einer Schraubenfeder und einem kugeligen Spannkopf 4b aus vorzugsweise zwei kugeligen Gliedern, die eine starre Baueinheit bilden. Der biegsame Teil 4a des Dorns 4, sein Spannkopf 4b und der Dornschaft 5 sind axial über ein Spannseil 6 mit Kopfstück 6a vorgespannt. Dazu dient eine zwischen dem als Druckstück dienenden Dornschaft 5 und einer am Spannseil 6 angeschlagenen Spannschraube 7 angeordnete Druckfeder 8. Am Spannseil 6 greift ein Zugelement 9 an, über das der Dorn 3 nach dem Biegevorgang zurückgezogen werden kann.The bending device consists of a fixed one straight pipe guide 1, an adjoining pivotable core template 2 with a terminal strip 3 and one arranged in the area of the core template 2 Mandrel 4 with it in the area of Pipe guide 1 located mandrel shaft 5. The mandrel 4 consists of a flexible mandrel part 4a in the form of a Coil spring and a spherical clamping head 4b preferably two spherical limbs that are rigid Form unit. The flexible part 4a of the mandrel 4 Clamping head 4b and the mandrel shaft 5 are axially over one Tensioning rope 6 biased with head piece 6a. This is what a between the mandrel shaft 5 and a tensioning screw 7 attached to the tensioning cable 6 arranged compression spring 8. The tension cable 6 engages Tension element 9, via which the mandrel 3 after Bending process can be withdrawn.

Die Arbeitsweise der erfindungsgemäßen Biegevorrichtung ist folgende:The operation of the bending device according to the invention is the following:

Bei um 90° gegenüber der in der Zeichnung dargestellten Stellung zurückgeschwenkter Kernschablone 2 fluchten die Rohrführung 1 und die Kernschablone 2 miteinander. In diesem Zustand wird ein zu biegendes Rohr R in die Rohrführung 1 eingeschoben, bis es mit seinem Anfang im geraden Auslaufteil der Kernschablone 2 liegt. Anschließend wird der Dorn 4 mit seinem Dornschaft 5 eingeschoben, bis der Spannkopf 4b im Bereich des geraden Auslaufteiles der Kernschablone 2 liegt. Dann wird das Rohrende mittels der Klemmleiste 3 zwischen dem Spannkopf 4b, dem geraden Auslaufteil der Kernschablone 2 und der Klemmleiste 3 eingespannt. In dieser Phase bildet die Schraubenfeder 4a eine geschlossene zylindrische Stützfläche. Dann wird die Kernschablone 2 verschwenkt und dabei das Rohr R gebogen. Wie die Zeichnung zeigt, wird während des Biegevorganges die Schraubenfeder 4a durch das Spannseil 6 gegen den Innenbogen der Kernschablone 2 gedrückt. Deshalb bleiben die einzelnen Windungen des als Schraubenfeder ausgebildeten Dornteils 4a am Innenbogen lückenlos aneinander liegen. Am Außenbogen tun sich dagegen Schlitze auf, was für die Formgebung des Rohres R von Nachteil ist, weil das Rohr R sich in diesem Bereich leicht einschnüren kann.At 90 ° compared to that shown in the drawing Position swung back core template 2 align the Pipe guide 1 and the core template 2 with each other. In In this state, a pipe R to be bent is inserted into the Inserted pipe guide 1 until it starts in straight outlet part of the core template 2 lies. Then the mandrel 4 with its mandrel shaft 5 inserted until the clamping head 4b in the area of the straight Outlet part of the core template 2 is. Then it will Pipe end by means of the clamping strip 3 between the clamping head 4b, the straight outlet part of the core template 2 and the Clamping strip 3 clamped. In this phase the Coil spring 4a is a closed cylindrical Support surface. Then the core template 2 is pivoted and bent the pipe R. As the drawing shows during the bending process, the coil spring 4a through the tension cable 6 against the inner arch of the Core template 2 pressed. Therefore, the individual stay Windings of the mandrel part designed as a coil spring 4a lie against each other without gaps on the inner arch. At the Outer arches, on the other hand, have slits, which for the Shaping the tube R is disadvantageous because the tube R can easily constrict itself in this area.

Nach Abschluß der Phase des Biegevorganges wird nach Lösen der Klemmleiste der Dorn 4 unter Beibehaltung der Stellung der Kernschablone 2 zurückgezogen. Die Zugkraft wird vom Zugglied 9 in das Zugseil 6 eingeleitet. Zu einem Verklemmen im Rohrbogen kann es trotz der starren Baueinheit der kugeligen Glieder wegen ihrer guten axialen Führung an axial versetzten Stellen und ihrer Form nicht kommen. Ihre Abrundungen und ihre mittige Einschnürung geben einerseits genügend Freiraum für das gebogene Rohr und wirken andererseits beim Zurückholen nachprofilierend auf das Rohr R ein. Es versteht sich, daß bei mehr als zwei kugeligen Gliedern, z. B drei Gliedern das mittlere Glied mit seiner Kontur zumindest am Innenbogen zurückspringen muß.After the phase of the bending process has been completed Loosen the terminal block of the mandrel 4 while maintaining the Position of the core template 2 withdrawn. The traction is initiated by the tension member 9 in the pull rope 6. To jamming in the pipe bend, it can despite the rigid Assembly of spherical limbs because of their good axial guidance at axially offset locations and their Shape does not come. Their rounds and their center Constrictions give enough space for that bent pipe and act on the other hand when retrieving re-profiling on the pipe R. It goes without saying that with more than two spherical links, for. B three Structure the middle link at least with its contour must jump back on the inner arch.

Nachdem die Klemmleiste 3 gelöst ist, werden der Dorn 6 mit dem Dornschaft 5 aus dem Rohr R herausgezogen und das gebogene Rohr R der Biegevorrichtung entnommen. Nach Zurückschwenken der Kernschablone 2 in ihre Ausgangsstellung kann ein neues Rohr in die Biegevorrichtung eingeschoben werden.After the terminal block 3 is released, the mandrel 6 pulled out of the tube R with the mandrel shaft 5 and that bent tube R taken from the bending device. To Swing the core template 2 back into its Starting position can be a new pipe in the Bending device can be inserted.

Das Ausführungsbeispiel der Figur 2 unterscheidet sich von dem der Figur 1 nur im Spannkopf. Soweit Übereinstimmungen bestehen, sind dieselben Bezugszeichen für die Einzelteile wie bei Figur 1 verwendet. The embodiment of Figure 2 differs of that of Figure 1 only in the clamping head. So far Correspondences exist, are the same reference numerals used for the individual parts as in Figure 1.

Der Spannkopf 14 besteht aus einem geschlitzten, kugeligen Außenring 14a und einem Stütz- und Spannkonus 14b, auf den das federbelastete Kopfstück 6a des inneren Spannseils 6 einwirkt.
Die Arbeitsweise der Biegevorrichtung des Ausführungsbeispieles der Figur 2 entspricht weitgehend derjenigen des Ausführungsbeispiels der Fig. 1, so daß nur noch auf die unterschiedliche Wirkung des Spannkopfes eingegangen wird:The tensioning head 14 consists of a slotted, spherical outer ring 14a and a support and tensioning cone 14b, on which the spring-loaded head piece 6a of the inner tensioning cable 6 acts.
The operation of the bending device of the embodiment of Figure 2 largely corresponds to that of the embodiment of Figure 1, so that only the different effect of the clamping head is discussed:

Wird nach Einklemmen des Rohranfangs zwischen dem Spannkopf 14 und der Klemmleiste 3 die Kernschablone 2 entgegen dem Uhrzeigersinn verschwenkt, dann wird das von der Kernschablone 2 und der Klemmleiste 3 gehaltene Rohr R mitgenommen und über den axial festliegenden Dorn 4 hinweggezogen. Wegen des konischen Sitzes des Spannkopfes 14 sorgen die dabei wirksamen Zugkräfte dafür, daß die Klemmkraft verstärkt wird.After clamping the pipe start between the Clamping head 14 and the terminal block 3 the core template 2 pivoted counterclockwise, then that of the core template 2 and the terminal block 3 held tube R carried and over the axially fixed mandrel 4th pulled away. Because of the conical seat of the clamping head 14 the effective tensile forces ensure that the Clamping force is increased.

Nach vollendetem Biegevorgang wird die Klemmleiste 3 gelöst und der Dorn mit dem Spannkopf 14 durch das gebogene Rohr R zurückgezogen. Dabei wird die Klemmwirkung des Spannkopfes 14 aufgrund des konischen Sitzes wegen der jetzt entgegengesetzt wirkenden Kräfte aufgehoben.After the bending process has been completed, the terminal strip 3 solved and the mandrel with the clamping head 14 by the bent tube R withdrawn. The Clamping effect of the clamping head 14 due to the conical Seat because of the now opposing forces canceled.

Claims (6)

Biegevorrichtung für dünnwandige Metallrohre (R) aus einer geraden Rohrführung (1), einer sich daran anschließenden und gegenüber der Rohrführung (1) verschwenkbaren Kernschablone (2) mit Klemmleiste (3), und einem Dorn (4), der einen Dornschaft (5) und einen im Bereich der Kernschablone (2) biegsamen Dornteil (4a) aufweist, der mittels eines inneren Spannseils (6) mit dem Dornschaft (5) federelastisch verspannt ist,
dadurch gekennzeichnet , daß der Dorn (4) als biegsamen Dornteil (4a) eine Schraubenfeder aufweist, die axial zwischen einem kugeligen Spannkopf (4b, 14) und dem Dornschaft (5) angeordnet ist, wobei das zu biegende Rohr (R) zwischen dem Spannkopf (4b, 14)) und der Kernschablone (2) mit ihrer Klemmleiste (3) kraftschlüssig einklemmbar ist.Bending device for thin-walled metal pipes (R) consisting of a straight pipe guide (1), a core template (2) adjoining it and pivotable relative to the pipe guide (1) with a clamping strip (3), and a mandrel (4) which has a mandrel shaft (5) and has a mandrel part (4a) which is flexible in the region of the core template (2) and is resiliently braced with the mandrel shaft (5) by means of an inner tensioning cable (6),
characterized in that the mandrel (4) as a flexible mandrel part (4a) has a helical spring which is arranged axially between a spherical clamping head (4b, 14) and the mandrel shaft (5), the tube (R) to be bent between the clamping head (4b, 14)) and the core template (2) with its clamping strip (3) can be non-positively clamped. Biegevorrichtung nach Anspruch 1,
dadurch gekennzeichnet , daß die Schraubenfeder (4a) im ungebogenen Zustand zumindest außenseitig eine glatte zylindrische Stützfläche bildet..Bending device according to claim 1,
characterized in that the helical spring (4a) forms a smooth cylindrical support surface at least on the outside in the unbent state. Biegevorrichtung nach Anspruch 1 oder 2
dadurch gekennzeichnet , daß das Druckstück (5) an einer Druckfeder (8) abgestützt ist, die ihrerseits an einer am Spannseil (6) widergelagerten Spannschraube (7) abgestützt ist.Bending device according to claim 1 or 2
characterized in that the pressure piece (5) is supported on a compression spring (8) which in turn is supported on a tensioning screw (7) which is supported on the tensioning cable (6). Biegevorrichtung nach einem der Ansprüche 1 bis 3
dadurch gekennzeichnet , daß der Spannkopf (14) aus einem geschlitzten Außenring (14a) und einem inneren Stütz- und Spannkonus (14b) besteht, der beim Biegevorgang selbstspannend auf den Außenring (14a) wirkt.Bending device according to one of claims 1 to 3
characterized in that the clamping head (14) consists of a slotted outer ring (14a) and an inner supporting and clamping cone (14b) which acts in a self-tensioning manner on the outer ring (14a) during the bending process. Biegevorrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet , daß der Spannkopf (14b) aus mehreren kugeligen Gliedern besteht, die eine starre Baueinheit bilden.Bending device according to one of claims 1 to 3,
characterized in that the clamping head (14b) consists of several spherical links which form a rigid structural unit. Biegevorrichtung nach einem der Ansprüche 1 bis 5
dadurch gekennzeichnet , daß das Spannseil (6) exzentrisch durch das Rohr (R) am Rohrinnenbogen entlang verläuft.Bending device according to one of claims 1 to 5
characterized in that the tensioning cable (6) runs eccentrically through the tube (R) along the tube inner bend.
EP01108674A 2000-04-27 2001-04-06 Bending apparatus for thin-walled metal pipes Expired - Lifetime EP1149640B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10020727 2000-04-27
DE10020727A DE10020727C1 (en) 2000-04-27 2000-04-27 Bending device for thin-walled metal pipes has pivoted bending block and flexible thorn inserted in end of pipe fed along straight pipe guide

Publications (3)

Publication Number Publication Date
EP1149640A2 true EP1149640A2 (en) 2001-10-31
EP1149640A3 EP1149640A3 (en) 2002-10-09
EP1149640B1 EP1149640B1 (en) 2004-06-23

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ID=7640152

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Application Number Title Priority Date Filing Date
EP01108674A Expired - Lifetime EP1149640B1 (en) 2000-04-27 2001-04-06 Bending apparatus for thin-walled metal pipes

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EP (1) EP1149640B1 (en)
AT (1) ATE269763T1 (en)
DE (2) DE10020727C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11577048B2 (en) 2019-03-01 2023-02-14 Argon Medical Devices, Inc. Medical device bending tool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10246977B4 (en) 2002-10-09 2007-06-28 Thyssenkrupp Steel Ag Device for 3D free-form bending of profiles
CN110893427B (en) * 2019-12-23 2024-04-26 江苏金鑫电器有限公司 Bending tool for spiral welded pipe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1675574A (en) * 1927-04-25 1928-07-03 William K Mykins Plumber's lead-pipe-bending spring
US2760545A (en) * 1952-06-23 1956-08-28 Solemslie Sverre Pipe bending tool
DE19707228A1 (en) * 1997-02-24 1998-08-27 Rudi Maas Mandrel for manual, semi- or fully-automatic pipe bender

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824312A1 (en) * 1988-07-18 1990-01-25 Rolf Dipl Ing Euler Apparatus for shaping workpieces and an actuating apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1675574A (en) * 1927-04-25 1928-07-03 William K Mykins Plumber's lead-pipe-bending spring
US2760545A (en) * 1952-06-23 1956-08-28 Solemslie Sverre Pipe bending tool
DE19707228A1 (en) * 1997-02-24 1998-08-27 Rudi Maas Mandrel for manual, semi- or fully-automatic pipe bender

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11577048B2 (en) 2019-03-01 2023-02-14 Argon Medical Devices, Inc. Medical device bending tool

Also Published As

Publication number Publication date
DE10020727C1 (en) 2001-10-04
EP1149640B1 (en) 2004-06-23
DE50102653D1 (en) 2004-07-29
EP1149640A3 (en) 2002-10-09
ATE269763T1 (en) 2004-07-15

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