EP0446819B1 - Tube bending machine - Google Patents

Tube bending machine Download PDF

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Publication number
EP0446819B1
EP0446819B1 EP19910103632 EP91103632A EP0446819B1 EP 0446819 B1 EP0446819 B1 EP 0446819B1 EP 19910103632 EP19910103632 EP 19910103632 EP 91103632 A EP91103632 A EP 91103632A EP 0446819 B1 EP0446819 B1 EP 0446819B1
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EP
European Patent Office
Prior art keywords
bending
pipe
traveller
template
guide
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EP19910103632
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German (de)
French (fr)
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EP0446819A2 (en
EP0446819A3 (en
Inventor
Hans Morgenthaler
Urs Kuehni
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Mewag Maschinenfabrik AG
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Mewag Maschinenfabrik AG
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Publication of EP0446819A3 publication Critical patent/EP0446819A3/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/02Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/024Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member

Definitions

  • the invention relates to a pipe bending machine according to the preamble of claim 1 and a method for bending a pipe.
  • Pipe bending machines are known for a wide variety of applications with different bending processes.
  • the invention is based on a pipe bending machine which presses the pipe to be bent onto the bending template by means of a clamping jaw on a swivel arm and carries out the bending by swiveling the swivel arm around the bending axis.
  • a pipe bending machine which is suitable for bending with different bending radii.
  • Their structure consists of an elongated machine frame, which has a bending table at one head end.
  • a receiving device for a bending mandrel and a feed carriage with a clamping sleeve for clamping a pipe are attached to the machine frame.
  • the receiving device for the mandrel and the feed carriage are arranged on guide plates which allow a displacement transverse to the longitudinal direction of the machine frame.
  • the bending table can be raised and lowered by means of a lifting device.
  • Two bending templates are arranged one above the other on the bending table along a vertical bending axis.
  • the lower or the upper bending template can be brought into the working position, ie in alignment with the clamping sleeve.
  • the bending process is carried out according to the known method by means of a swivel arm which can be pivoted about the bending axis.
  • a clamping jaw with the associated clamping device is attached to the swivel arm.
  • the clamping jaw is further arranged upstream of a slide rail.
  • the pipe to be bent is moved together with the feed carriage by transverse movement extended from the groove of the first bending template and brought the second bending template into the working position by means of the table stroke.
  • the tube is then struck against the groove of the second bending template by transverse movement.
  • this pipe bending machine is suitable for bending with different bending radii in subsequent bending operations. Left and right bending cannot be carried out with this machine.
  • a pipe bending machine is known from US Pat. No. 3,017,917. It is provided with a bending table, which has a bending template on two opposite sides and clamping jaws that can be pivoted about a vertical axis. An associated feed carriage with clamping sleeve is assigned to each of the two bending templates. When changing from left to right bending, the table with the feed carriage and the clamping sleeves together with the associated bending template is pivoted by 180 ° via a hinge on the side. The second bending template together with the second feed carriage with clamping sleeve is now brought into the working position.
  • a bending machine which has a number of features in common with the invention which are listed in the preamble of claim 1.
  • This bending machine has several disadvantages.
  • a feed carriage with clamping sleeve and its longitudinal guide is swiveled by 180 ° about a swivel axis.
  • the workpiece Before the pivoting can begin, however, the workpiece must be axially removed from the first bending template and axially replaced after the pivoting in the second bending template.
  • This removal of the workpiece from the bending template requires manual removal and reclamping of the workpiece from the clamping sleeve.
  • each clamping and unclamping operation of the workpiece represents a loss of accuracy in the subsequent bending operations, a restriction for automation and for an increase in production.
  • the invention has for its object to provide a bending machine and a bending method that allow bending operations with different bending radii and / or a change in the bending direction from left bending to right bending.
  • the bending should be able to be carried out with a bending mandrel and with a feed carriage which can be moved in the longitudinal direction of the machine frame.
  • transverse movement of the feed carriage and a boom can be simplified if, according to a further exemplary embodiment, the boom and the longitudinal guide are held at a parallel distance by means of guides and can be displaced transversely to the longitudinal direction together with the feed carriage. Another advantage results from the arrangement of the receiving device for the mandrel on the boom.
  • the cross-movement of the feed carriage and the rotation of the bending table can be carried out by hand.
  • short changeover times can be achieved if drives for the transverse displacement of the feed carriage, the clamping jaws and for the rotation of the bending table are program-controlled.
  • the method steps according to claim 5 can be programmed overlapping in time, which leads to a further reduction in the cycle times between two bending operations.
  • the bending mandrel which moves from its receiving device 32 to a bending template 36 and the tube to be bent is omitted in FIG. 1.
  • a dash-dotted axis 5 indicates the longitudinal axis of the bending mandrel and a tube as well as the axial directions of movement for advancing and retracting the bending mandrel and the tube.
  • a bending table 13 with two bending templates 36, 37 rotatably mounted about a vertical axis 38 and a swivel arm 7 pivotable about the vertical axis 38 is attached.
  • jaws 41, 42 are provided with associated clamping devices of a known type.
  • the clamping jaws 41, 42 have 13 slide rails 47, 48 arranged on the bending table.
  • the swivel arm 7 is driven by an electric motor 39 and a transmission 40 via bevel gears 44, 45 (FIG. 2).
  • the bending table 13 is rotatably mounted together with the bending tools about an axis 14 which is parallel to the longitudinal direction 8 of the machine frame 11.
  • the bending table 13 is rotated by a motor 34 with worm shaft 35.
  • the two bending templates 36, 37, the clamping jaws 41, 42 and the slide rails 47, 48 are each mounted on two opposite sides and at a distance from this axis 14 on the bending table 13 that she can be brought into a working or parking position alternately by rotating the bending table 13.
  • the motor 23 for the transverse displacement of the feed carriage 25 and drives for the clamping jaws 41, 42, for the slide rails 47, 48 and motor 34 for the rotation of the bending table 13 are electronically linked via a program control (not shown).
  • the method for bending a tube 44 is explained with reference to the schematic FIGS. 3-8, wherein bending operations are carried out with two different bending radii and / or left and right bending.
  • a bending operation in this example a left-hand bend
  • the clamping jaw 41 and the slide rail 48 are opened.
  • the tube 44 is moved outside of a tool-specific limiting circle 50 of the bending template 36 in a first direction 45 by transverse displacement of the feed carriage 25 in a first direction 45.
  • the center of the limiting circle 50 is the axis of rotation 14 of the bending table 13.
  • the bending table 13 is then together with the bending templates 36, 37, the clamping jaws 41, 42 and the slide rails 47, 48 about the axis 14 by a predetermined angle, preferably 90 ° ( Fig. 5) rotated.
  • the feed carriage with the tube 44 is brought into a new position outside of a delimitation circle 50 ', for example 2-4 mm outside of the delimitation circle 50', by transverse displacement in the direction of arrow 46 opposite to the first direction 45.
  • the delimitation circle 50 ' results from the dimensions of the second bending template 37 when the bending table 13 rotates about the axis 14 into the working position.
  • the bending table 13 is rotated in two steps of 90 °.
  • a continuous movement of 180 ° can also be selected. If the tube 44 is located between the second bending template 37 and the clamping jaw 42, the tube 44 can be moved towards the second bending template 37 by means of the transverse displacement of the feed carriage 25 and by means of the clamping jaw 42 are clamped. A new bending operation, in this example a right bend, can be initiated.
  • the movement sequences of the feed carriage 25, the clamping jaws 41, 42, the slide rails 47, 48 and the rotation of the bending table 13 can be mutually overlapping provided by a computer control.

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

Description

Die Erfindung betrifft eine Rohrbiegemaschine gemäss Oberbegriff von Anspruch 1 und ein Verfahren zum Biegen eines Rohres.The invention relates to a pipe bending machine according to the preamble of claim 1 and a method for bending a pipe.

Rohrbiegemaschinen sind für verschiedenste Anwendungszwecke mit unterschiedlichen Biegeverfahren bekannt. Die Erfindung baut auf einer Rohrbiegemaschine auf, die mittels einer Spannbacke auf einem Schwenkarm das zu biegende Rohr an die Biegeschablone anpresst und durch Verschwenkung des Schwenkarmes um die Biegeachse die Biegung durchführt.Pipe bending machines are known for a wide variety of applications with different bending processes. The invention is based on a pipe bending machine which presses the pipe to be bent onto the bending template by means of a clamping jaw on a swivel arm and carries out the bending by swiveling the swivel arm around the bending axis.

Aus DE-OS 3 627 502 ist eine Rohrbiegemaschine bekannt, die zum Biegen mit unterschiedlichen Biegeradien geeignet ist. Ihr Aufbau besteht aus einem langgestreckten Maschinenrahmen, der an einem Kopfende einen Biegetisch aufweist. Auf dem Maschinenrahmen ist eine Aufnahmevorrichtung für einen Biegedorn und ein Vorschubwagen mit einer Klemmhülse zum Einspannen eines Rohres angebracht. Die Aufnahmevorrichtung für den Biegedorn und der Vorschubwagen sind auf Führungsplatten angeordnet, die eine Verschiebung quer zur Längsrichtung des Maschinenrahmens zulassen.From DE-OS 3 627 502 a pipe bending machine is known which is suitable for bending with different bending radii. Their structure consists of an elongated machine frame, which has a bending table at one head end. A receiving device for a bending mandrel and a feed carriage with a clamping sleeve for clamping a pipe are attached to the machine frame. The receiving device for the mandrel and the feed carriage are arranged on guide plates which allow a displacement transverse to the longitudinal direction of the machine frame.

Der Biegetisch ist mittels einer Hubeinrichtung heb- und senkbar. Auf dem Biegetisch sind entlang einer vertikalen Biegeachse zwei Biegeschablonen übereinander angeordnet. Je nach der Höheneinstellung des Biegetisches kann die untere oder die obere Biegeschablone in Arbeitsstellung, d.h. fluchtend zur Klemmhülse, gebracht werden. Der Biegevorgang wird nach dem bekannten Verfahren mittels einem um die Biegeachse verschwenkbaren Schwenkarm durchgeführt. Auf dem Schwenkarm ist eine Spannbacke mit zugehöriger Festklemmeinrichtung angebracht. Der Spannbacke ist im weiteren eine Gleitschiene vorgeordnet. Um einen Biegeschablonenwechsel zwischen zwei Biegeoperationen vorzunehmen, wird das zu biegende Rohr zusammen mit dem Vorschubwagen durch Querbewegung aus der Rille der ersten Biegeschablone ausgefahren und mittels des Tischhubes die zweite Biegeschablone in Arbeitsstellung gebracht. Durch Querbewegung wird anschliessend das Rohr an die Rille der zweiten Biegeschablone angeschlagen. Wie eingangs aufgeführt, eignet sich diese Rohrbiegemaschine für ein Biegen mit unterschiedlichen Biegeradien bei sich folgenden Biegeoperationen. Ein Links- und Rechtsbiegen kann mit dieser Maschine nicht durchgeführt werden.The bending table can be raised and lowered by means of a lifting device. Two bending templates are arranged one above the other on the bending table along a vertical bending axis. Depending on the height setting of the bending table, the lower or the upper bending template can be brought into the working position, ie in alignment with the clamping sleeve. The bending process is carried out according to the known method by means of a swivel arm which can be pivoted about the bending axis. A clamping jaw with the associated clamping device is attached to the swivel arm. The clamping jaw is further arranged upstream of a slide rail. In order to change a bending template between two bending operations, the pipe to be bent is moved together with the feed carriage by transverse movement extended from the groove of the first bending template and brought the second bending template into the working position by means of the table stroke. The tube is then struck against the groove of the second bending template by transverse movement. As mentioned at the beginning, this pipe bending machine is suitable for bending with different bending radii in subsequent bending operations. Left and right bending cannot be carried out with this machine.

Aus US-PS 3 017 917 ist eine Rohrbiegemaschine bekannt. Sie ist mit einem Biegetisch versehen, der auf zwei gegenüberliegenden Seiten je eine Biegeschablone und um eine vertikale Achse verschwenkbare Spannbacken aufweist. Jeder der beiden Biegeschablonen ist je ein zugehöriger Vorschubwagen mit Klemmhülse zugeordnet. Beim Wechsel von Links- auf Rechtsbiegen wird der Tisch mit den Vorschubwagen und den Klemmhülsen zusammen mit der zugehörigen Biegeschablone über ein seitlich angeordnetes Scharnier um 180° verschwenkt. Die zweite Biegeschablone zusammen mit dem zweiten Vorschubwagen mit Klemmhülse wird nun in Arbeitsstellung gebracht. Bei dieser Einrichtung muss bei einem Wechsel von Links- auf Rechtsbiegen das Werkstück von Hand aus der ersten Klemmhülse entfernt und in die zweite Klemmhülse eingespannt werden. Für eine Automatisierung sich folgender Biegeoperationen mit Wechsel von Links- auf Rechtsbiegen ist dieses Konzept nicht geeignet.A pipe bending machine is known from US Pat. No. 3,017,917. It is provided with a bending table, which has a bending template on two opposite sides and clamping jaws that can be pivoted about a vertical axis. An associated feed carriage with clamping sleeve is assigned to each of the two bending templates. When changing from left to right bending, the table with the feed carriage and the clamping sleeves together with the associated bending template is pivoted by 180 ° via a hinge on the side. The second bending template together with the second feed carriage with clamping sleeve is now brought into the working position. With this device, when changing from left to right bending, the workpiece must be manually removed from the first clamping sleeve and clamped in the second clamping sleeve. This concept is not suitable for the automation of subsequent bending operations with a change from left to right bending.

Aus GB-A-2 047 584 ist weiter eine Biegemaschine bekannt, die eine Anzahl von gemeinsamen Merkmalen mit der Erfindung aufweist, die im Oberbegriff von Anspruch 1 aufgelistet sind. Diese Biegemaschine weist verschiedene Nachteile auf. Beim Wechsel von Links- auf Rechtsbiegen oder umgekehrt wird ein Vorschubwagen mit Klemmhülse und seiner Längsführung um eine Schwenkachse um 180° verschwenkt. Bevor aber die Verschwenkung beginnen kann, muss das Werkstück axial aus der ersten Biegeschablone entfernt und nach der Verschwenkung axial in die zweite Biegeschablone wieder eingesetzt werden. Diese Entfernung des Werkstückes aus der Biegeschablone erfordert ein manuelles Aus- und Wiedereinspannen des Werkstückes aus der Klemmhülse. Jede Ein- und Ausspannoperation des Werkstückes stellt aber einen Genauigkeitsverlust sich folgender Biegeoperationen, eine Einschränkung für eine Automatisierung und für eine Produktionssteigerung dar.From GB-A-2 047 584 a bending machine is further known which has a number of features in common with the invention which are listed in the preamble of claim 1. This bending machine has several disadvantages. When changing from left to right bending or vice versa, a feed carriage with clamping sleeve and its longitudinal guide is swiveled by 180 ° about a swivel axis. Before the pivoting can begin, however, the workpiece must be axially removed from the first bending template and axially replaced after the pivoting in the second bending template. This removal of the workpiece from the bending template requires manual removal and reclamping of the workpiece from the clamping sleeve. However, each clamping and unclamping operation of the workpiece represents a loss of accuracy in the subsequent bending operations, a restriction for automation and for an increase in production.

Der Erfindung liegt die Aufgabe zugrunde, eine Biegemaschine und ein Biegeverfahren zu schaffen, die Biegeoperationen mit unterschiedlichen Biegeradien und/oder einen Wechsel der Biegerichtung von Linksbiegen auf Rechtsbiegen zulassen. Im weiteren soll das Biegen mit einem Biegedorn und mit einem in Längsrichtung des Maschinenrahmens verfahrbaren Vorschubwagen durchführbar sein. Bei der Verarbeitung eines Rohres mit einander sich folgenden Biegeoperationen sollen die genannten Umstellungen mit grösstmöglicher Schnelligkeit und minimalstem Investitionsaufwand realisierbar sein.The invention has for its object to provide a bending machine and a bending method that allow bending operations with different bending radii and / or a change in the bending direction from left bending to right bending. In addition, the bending should be able to be carried out with a bending mandrel and with a feed carriage which can be moved in the longitudinal direction of the machine frame. When processing a pipe with successive bending operations, the changes mentioned should be possible with the greatest possible speed and with minimal investment.

Nach der Erfindung wird diese Aufgabe durch die Summe der Merkmale von Anspruch 1 gelöst.According to the invention, this object is achieved by the sum of the features of claim 1.

Mit der erfindungsgemässen Vorrichtung und dem neuen Biegeverfahren ist es möglich, auch bei einander sich folgenden Biegeoperationen am gleichen Werkstück sowohl nach links wie nach rechts, als auch mit unterschiedlichen Biegeradien, zu biegen. Das Werkstück kann beim Werkzeugewechsel in der Klemmhülse eingespannt bleiben, was eine erhöhte Biegegenauigkeit ergibt. Bei einem programmgesteuerten Werkzeugeinsatz können zusätzlich sehr kurze Uebergangszeiten zwischen zwei Biegeoperationen erreicht werden. Dabei müssen auf Verfahrensmerkmale wie Biegen mit Biegedorn und einem in Längsrichtung verfahrbaren Vorschubwagen nicht verzichtet werden.With the device according to the invention and the new bending method, it is possible to bend to the left as well as to the right, as well as with different bending radii, even in subsequent bending operations on the same workpiece. The workpiece can remain clamped in the clamping sleeve when changing the tool, which results in increased bending accuracy. With a program-controlled use of tools, very short transition times between two bending operations can also be achieved. Process features such as bending with a mandrel and a feed carriage that can be moved in the longitudinal direction do not have to be omitted.

Die Querbewegung des Vorschubwagens und eines Auslegers kann vereinfacht werden, wenn, gemäss einem weiteren Ausführungsbeispiel, der Ausleger und die Längsführung mittels Führungen in parallelem Abstand gehalten, und gemeinsam mit dem Vorschubwagen quer zur Längsrichtung verschiebbar sind. Ein weiterer Vorteil ergibt sich durch die Anordnung der Aufnahmevorrichtung für den Biegedorn am Ausleger.The transverse movement of the feed carriage and a boom can be simplified if, according to a further exemplary embodiment, the boom and the longitudinal guide are held at a parallel distance by means of guides and can be displaced transversely to the longitudinal direction together with the feed carriage. Another advantage results from the arrangement of the receiving device for the mandrel on the boom.

Wird ein niedriger Automatisierungsgrad gewünscht, kann die Querverschiebung des Vorschubwagens und die Drehung des Biegetisches von Hand durchgeführt werden. Kurze Umstellzeiten können gemäss einem weiteren Ausführungsbeispiel erreicht werden, wenn Antriebe für die Querverschiebung des Vorschubwagens, der Spannbacken und für die Drehung des Biegetisches programmgesteuert sind. Die Verfahrensschritte gemäss Anspruch 5 können dabei zeitlich überschneidend programmiert werden, was zu einer weiteren Verkürzung der Zykluszeiten zwischen zwei Biegeoperationen führt.If a low degree of automation is required, the cross-movement of the feed carriage and the rotation of the bending table can be carried out by hand. According to a further exemplary embodiment, short changeover times can be achieved if drives for the transverse displacement of the feed carriage, the clamping jaws and for the rotation of the bending table are program-controlled. The method steps according to claim 5 can be programmed overlapping in time, which leads to a further reduction in the cycle times between two bending operations.

Im nachfolgenden wird die Erfindung an Ausführungsbeispielen erläutert.The invention is explained below using exemplary embodiments.

Es zeigen:

Fig. 1
eine Rohrbiegemaschine in perspektivischer Darstellung,
Fig. 2
einen Schnitt entlang der Linie II-II nach Fig. 1 durch den Biegetisch und
Fig. 3-8
schematische Ansichten auf den Biegetisch bei einander sich folgenden Verfahrensschritten für einen Wechsel der Biegeschablone.

In Fig. 1 und 2 ist auf einem langgestreckten Maschinenrahmen 11 ein Vorschubwagen 25 mit einer Klemmhülse 6 zum Einspannen eines Rohres angeordnet. Der Vorschubwagen 25 ist entlang einer Längsführung 15 in Längsrichtung 8 des Maschinenrahmens 11 verschiebbar. Zur Führung des Vorschubwagens 25 sind Rollen 26 - 29 vorgesehen. Ein Antrieb 30 bewegt den Vorschubwagen 25 über einen Zahnriemen 31. Auf einem Ausleger 16 ist mit 32 schematisch eine Aufnahmevorrichtung für einen Biegedorn angebracht. Der Ausleger 16 mit der Aufnahmevorrichtung 32 für den Biegedorn und die Längsführung 15 sind mittels Führungen 17, 18 in parallelem Abstand gehalten und bilden gemeinsam mit dem Vorschubwagen 25 eine Verschiebeeinheit, die quer zur Längsrichtung 8 verschiebbar ist. Mittels einem Motor 23 oder einem Handrad wird über eine Gewindespindel 24 die Verschiebeeinheit bewegt.Show it:
Fig. 1
a pipe bending machine in perspective,
Fig. 2
a section along the line II-II of FIG. 1 by the bending table and
Fig. 3-8
schematic views on the bending table in the process steps following one another for changing the bending template.

1 and 2, a feed carriage 25 with a clamping sleeve 6 for clamping a tube is arranged on an elongated machine frame 11. The feed carriage 25 can be moved along a longitudinal guide 15 in the longitudinal direction 8 of the machine frame 11. For guiding the feed carriage 25 rollers 26-29 are provided. A drive 30 moves the feed carriage 25 via a toothed belt 31. A pick-up device for a bending mandrel is schematically attached to a bracket 16 at 32. The boom 16 with the receiving device 32 for the bending mandrel and the longitudinal guide 15 are held at a parallel distance by means of guides 17, 18 and, together with the feed carriage 25, form a displacement unit which can be displaced transversely to the longitudinal direction 8. The displacement unit is moved by means of a motor 23 or a handwheel via a threaded spindle 24.

Zum besseren Verständnis ist der Biegedorn, der sich von seiner Aufnahmevorrichtung 32 bis zu einer Biegeschablone 36 bewegt und das zu biegende Rohr in Fig. 1 weggelassen. Eine strichpunktierte Achse 5 deutet die Längsachse des Biegedornes und eines Rohres sowie die axialen Bewegungsrichtungen für Vorschub und Rückzug des Biegedornes und des Rohres an.For a better understanding, the bending mandrel, which moves from its receiving device 32 to a bending template 36 and the tube to be bent is omitted in FIG. 1. A dash-dotted axis 5 indicates the longitudinal axis of the bending mandrel and a tube as well as the axial directions of movement for advancing and retracting the bending mandrel and the tube.

An einem Kopfende des Maschinenrahmens 11 ist ein Biegetisch 13 mit zwei um eine vertikale Achse 38 drehbar gelagerten Biegeschablonen 36, 37 und ein um die vertikale Achse 38 verschwenkbarer Schwenkarm 7 angebracht. Auf dem Schwenkarm 7 sind Spannbacken 41, 42 mit zugehörigen Festklemmeinrichtungen bekannter Bauart vorgesehen. Den Spannbacken 41, 42 sind auf dem Biegetisch 13 Gleitschienen 47, 48 vorgeordnet. Der Antrieb für den Schwenkarm 7 erfolgt durch Elektromotor 39 und Getriebe 40 über Kegelräder 44, 45 (Fig. 2). Der Biegetisch 13 ist zusammen mit den Biegewerkzeugen um eine Achse 14, die parallel zur Längsrichtung 8 des Maschinenrahmens 11 liegt, drehbar gelagert. Eine Drehbewegung des Biegetisches 13 erfolgt über einen Motor 34 mit Schneckenwelle 35. Die zwei Biegeschablonen 36, 37, die Spannbacken 41, 42 und die Gleitschienen 47, 48 sind je auf zwei gegenüberliegenden Seiten und im Abstand zu dieser Achse 14 am Biegetisch 13 so angebracht, dass sie durch Drehung des Biegetisches 13 abwechselnd in eine Arbeits- oder Parkposition bringbar sind.At a head end of the machine frame 11, a bending table 13 with two bending templates 36, 37 rotatably mounted about a vertical axis 38 and a swivel arm 7 pivotable about the vertical axis 38 is attached. On the swivel arm 7 jaws 41, 42 are provided with associated clamping devices of a known type. The clamping jaws 41, 42 have 13 slide rails 47, 48 arranged on the bending table. The swivel arm 7 is driven by an electric motor 39 and a transmission 40 via bevel gears 44, 45 (FIG. 2). The bending table 13 is rotatably mounted together with the bending tools about an axis 14 which is parallel to the longitudinal direction 8 of the machine frame 11. The bending table 13 is rotated by a motor 34 with worm shaft 35. The two bending templates 36, 37, the clamping jaws 41, 42 and the slide rails 47, 48 are each mounted on two opposite sides and at a distance from this axis 14 on the bending table 13 that she can be brought into a working or parking position alternately by rotating the bending table 13.

Ueber eine nicht dargestellte Programmsteuerung ist der Motor 23 für die Querverschiebung des Vorschubwagens 25 und sind Antriebe für die Spannbacken 41, 42, für die Gleitschienen 47, 48 sowie Motor 34 für die Drehung des Biegetisches 13 miteinander elektronisch verknüpft.The motor 23 for the transverse displacement of the feed carriage 25 and drives for the clamping jaws 41, 42, for the slide rails 47, 48 and motor 34 for the rotation of the bending table 13 are electronically linked via a program control (not shown).

Das Verfahren zum Biegen eines Rohres 44 wird anhand der schematischen Figuren 3 - 8 erläutert, wobei Biegeoperationen mit zwei unterschiedlichen Biegeradien und/oder ein Links- und Rechtsbiegen durchgeführt werden. Nach Beendigung einer Biegeoperation, in diesem Beispiel ein Linksbiegen, wird die Spannbacke 41 und die Gleitschiene 48 geöffnet. Das Rohr 44 wird durch Querverschiebung des Vorschubwagens 25 in eine erste Richtung 45 von der Biegeschablone 36 weg ausserhalb eines werkzeugspezifischen Begrenzungskreises 50 der Biegeschablone 36 gebracht. Das Zentrum des Begrenzungskreises 50 ist die Drehachse 14 des Biegetisches 13. Der Biegetisch 13 wird anschliessend zusammen mit den Biegeschablonen 36, 37, den Spannbacken 41, 42 und den Gleitschienen 47, 48 um die Achse 14 um einen vorbestimmten Winkel, vorzugweise 90° (Fig. 5) gedreht. Der Vorschubwagen mit dem Rohr 44 wird durch Querverschiebung in Richtung des Pfeiles 46 entgegengesetzt zur ersten Richtung 45 in eine neue Position ausserhalb eines Begrenzungskreises 50', beispielsweise 2 - 4 mm ausserhalb des Begrenzungskreises 50', gebracht. Der Begrenzungskreis 50' ergibt sich durch die Abmessungen der zweiten Biegeschablone 37 bei der Drehung des Biegetisches 13 um die Achse 14 in die Arbeitsposition. In der Regel wird der Biegetisch 13 in zwei Schritten von 90° gedreht. Je nach den Erfordernissen kann aber auch eine kontinuierliche Bewegung von 180° gewählt werden. Wenn sich das Rohr 44 zwischen der zweiten Biegeschablone 37 und der Spannbacke 42 befindet, kann durch Querverschiebung des Vorschubwagens 25 das Rohr 44 zur zweiten Biegeschablone 37 hinbewegt und mittels der Spannbacke 42 festgeklemmt werden. Eine neue Biegeoperation, in diesem Beispiel ein Rechtsbiegen, kann eingeleitet werden.The method for bending a tube 44 is explained with reference to the schematic FIGS. 3-8, wherein bending operations are carried out with two different bending radii and / or left and right bending. After completion of a bending operation, in this example a left-hand bend, the clamping jaw 41 and the slide rail 48 are opened. The tube 44 is moved outside of a tool-specific limiting circle 50 of the bending template 36 in a first direction 45 by transverse displacement of the feed carriage 25 in a first direction 45. The center of the limiting circle 50 is the axis of rotation 14 of the bending table 13. The bending table 13 is then together with the bending templates 36, 37, the clamping jaws 41, 42 and the slide rails 47, 48 about the axis 14 by a predetermined angle, preferably 90 ° ( Fig. 5) rotated. The feed carriage with the tube 44 is brought into a new position outside of a delimitation circle 50 ', for example 2-4 mm outside of the delimitation circle 50', by transverse displacement in the direction of arrow 46 opposite to the first direction 45. The delimitation circle 50 'results from the dimensions of the second bending template 37 when the bending table 13 rotates about the axis 14 into the working position. As a rule, the bending table 13 is rotated in two steps of 90 °. Depending on the requirements, a continuous movement of 180 ° can also be selected. If the tube 44 is located between the second bending template 37 and the clamping jaw 42, the tube 44 can be moved towards the second bending template 37 by means of the transverse displacement of the feed carriage 25 and by means of the clamping jaw 42 are clamped. A new bending operation, in this example a right bend, can be initiated.

Die Bewegungsabläufe des Vorschubwagens 25, der Spannbacken 41, 42, der Gleitschienen 47, 48 und der Drehung des Biegetisches 13 können durch eine Computersteuerung gegenseitig überschneidend vorgesehen werden.The movement sequences of the feed carriage 25, the clamping jaws 41, 42, the slide rails 47, 48 and the rotation of the bending table 13 can be mutually overlapping provided by a computer control.

Claims (6)

  1. Pipe-bending machine, consisting of
    - an elongated machine frame (11),
    - a traveller (25) with a collet (6) for clamping a pipe which is displaceable along a longitudinal guide (15) in a longitudinal direction (8) of the machine frame (11) and
    - a bending table (13), which has a bending template (36, 37), a clamping jaw (41, 42) swivellable around a swivel arm (7) and a guide bar (47, 48) on each of two opposed sides at a distance,
    the traveller (25) forms together with the collet (6) and the longitudinal guide (15) a displacement unit, which is displaceable into positions transverse to the longitudinal direction (8) of the machine frame (11),
    characterized in that
    the bending table (13) on the machine frame (11) is pivoted around an axis (14) parallel to the longitudinal direction (8) of the machine frame (11) and by rotation of the bending table (13) one of the two bending templates (36, 37), which are arranged at a distance from this axis (14), can be moved into an operating position and the other into a parking position alternately and the swivel arm (7) in the operating position has a vertical swivel axis (38), a receiving device (32) for a bending mandrel is mounted on the displacement unit and arranged for the displacement unit are guide mechanisms (17, 18) for a horizontal displacement transverse to the longitudinal direction (8) and relative to the bending template (36, 37).
  2. Pipe-bending machine according to claim 1, characterized in that an extension arm (16) and the longitudinal guide (15) are kept at a parallel distance by means of guide mechanisms (18) and are displaceable jointly with the traveller (25) transverse to the longitudinal direction (8).
  3. Pipe-bending machine according to claim 2, characterized in that arranged on the extension arm (16) is the receiving device (32) for the bending mandrel.
  4. Pipe-bending machine according to any of the claims 1 - 3, characterized in that drives (23, 34, 35) for the transverse displacement of the traveller (25), the clamping jaws (41, 42) and for the rotation of the bending table (13) are program-controlled.
  5. Method of bending a pipe using a pipe-bending machine according to any of the claims 1-4, bending operations being executed with two different bending radii and/or left-hand or right-hand bending,
    characterized in that
    following a first bending operation the clamping jaw (41) and the guide bar (47) are opened and the pipe (44) is removed from a tool-specific limiting circle (50) of the bending template (36) by transverse displacement of the traveller (25) in a first direction (45) away from the bending template (36), the bending table (13) together with the bending templates (36, 37), the clamping jaws (41, 42) and the guide bars (47, 48) are rotated around the axis (14) by a predetermined angle, preferably 90°, the pipe is moved into a position outside the limiting circle (50') of the other bending template (37) by transverse displacement of the traveller (25) opposite (46) to the first direction (45), the bending table (13) is rotated further around the axis (14) by a predetermined angle, preferably 90°, into the new operating position, the pipe (44) is moved towards the other bending template (37) by transverse displacement of the traveller (25) and clamped by means of the clamping jaw (42) and a new bending operation is initiated.
  6. Method according to claim 5, characterized in that the sequences of movements of the traveller (25), the clamping jaws (41, 42), the guide bars (47, 48) and the rotation of the bending table (13) are programmed to be reciprocally overlapping.
EP19910103632 1990-03-13 1991-03-09 Tube bending machine Expired - Lifetime EP0446819B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH79790A CH683598A5 (en) 1990-03-13 1990-03-13 Tube bending machine.
CH797/90 1990-03-13

Publications (3)

Publication Number Publication Date
EP0446819A2 EP0446819A2 (en) 1991-09-18
EP0446819A3 EP0446819A3 (en) 1991-11-06
EP0446819B1 true EP0446819B1 (en) 1994-05-18

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EP19910103632 Expired - Lifetime EP0446819B1 (en) 1990-03-13 1991-03-09 Tube bending machine

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EP (1) EP0446819B1 (en)
CH (1) CH683598A5 (en)
DE (1) DE4010445C2 (en)

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IT1251934B (en) * 1991-10-16 1995-05-27 Macchine Curvatubi Crippa Agos MULTIPURPOSE PIPE BENDING MACHINE
KR0182069B1 (en) * 1995-06-22 1999-04-01 송병준 Bent-up system of cutting blade
IT1290141B1 (en) * 1997-03-21 1998-10-19 Blm Spa MACHINE TO CURVE FILIFORM MATERIALS SUCH AS BAR TUBES OR PROFILES
DE19830962B4 (en) * 1998-07-10 2005-07-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Apparatus and method for bending rod-like workpieces
DE50100461D1 (en) * 2001-01-30 2003-09-11 Blm Spa Machine for bending strand-like material, such as pipes, bars, profiles or metal wire
EP1350578B1 (en) * 2002-04-03 2007-04-25 Trumpf Werkzeugmaschinen GmbH + Co. KG Machine for bending bar and/or rod-like workpieces, in particular tubes
EP1350577A1 (en) 2002-04-03 2003-10-08 Trumpf Pulzer GmbH + Co. KG Machine for bending bar or rod like workpieces, in particular tubes
ES2280457T3 (en) * 2002-07-13 2007-09-16 Trumpf Werkzeugmaschinen Gmbh + Co. Kg BINDING MACHINE.
EP1380362B1 (en) * 2002-07-13 2008-03-26 Trumpf Werkzeugmaschinen GmbH + Co. KG Tube bending machine with tube feed and mandrell pull back
EP1396294A1 (en) * 2002-09-05 2004-03-10 Trumpf Rohrtechnik GmbH + Co. KG Bending machine with bending tools at opposite sides of a tool carrier
DE50205694D1 (en) * 2002-10-02 2006-04-13 Trumpf Rohrtechnik Gmbh & Co K Bending machine with rotating tool unit
JP4591908B2 (en) * 2003-12-15 2010-12-01 臼井国際産業株式会社 Pipe bending machine
DE102009038384A1 (en) * 2009-08-24 2011-03-03 Tracto-Technik Gmbh & Co. Kg Device for bending elongate workpieces
CH701801A2 (en) * 2009-09-09 2011-03-15 Mewag Maschinenfabrik Ag Bending machine for bending elongated workpieces, in particular pipes or profiles.
CN101862796B (en) * 2010-05-24 2011-12-14 张家港市明华机械制造有限公司 Installation structure of feeding trolley on pipe bending machine
CN103464549A (en) * 2013-09-12 2013-12-25 昆山市巴城镇顺拓工程机械配件厂 Pipe bending device for metal pipe
CN103464547A (en) * 2013-09-25 2013-12-25 张家港市华舜机械制造有限公司 Upper and lower die changing device for pipe bending machine
CN103537586A (en) * 2013-11-01 2014-01-29 浙江杰特机电科技有限公司 9-shaped bending device for Christmas trees
DE102016101908B4 (en) 2016-02-03 2017-11-02 Dengler Tubetec Gmbh Apparatus and method for bending pipes
DE102017009493B4 (en) 2016-10-25 2023-02-02 Tracto-Technik Gmbh & Co. Kg System for producing a bending head for a device for bending an elongate body, method for producing a bending head for a device for bending an elongate body, device for bending an elongate body and use of the device for bending an elongate body
CN108225937B (en) * 2018-01-30 2023-09-22 北方工业大学 Bending test method and device for high-strength steel sheet
CN110560524B (en) * 2019-09-27 2024-05-28 常州至能自动化设备有限公司 Multi-diameter pipe bending machine
CN114570807B (en) * 2022-01-25 2023-04-07 南京航空航天大学 Six-axis bending device and method based on mandrel rotation
CN117299901B (en) * 2023-11-28 2024-02-13 山东宏力异型钢管有限公司 Automatic push bending forming machine

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US4843859A (en) * 1987-07-14 1989-07-04 Chiyoda Kogyo Co., Ltd. Pipe bender

Also Published As

Publication number Publication date
DE4010445A1 (en) 1991-09-19
DE4010445C2 (en) 1998-11-19
EP0446819A2 (en) 1991-09-18
EP0446819A3 (en) 1991-11-06
CH683598A5 (en) 1994-04-15

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