EP0481279A2 - Method of spatial roll-stretch-bending in combination with a mandrel bending station - Google Patents

Method of spatial roll-stretch-bending in combination with a mandrel bending station Download PDF

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Publication number
EP0481279A2
EP0481279A2 EP91116744A EP91116744A EP0481279A2 EP 0481279 A2 EP0481279 A2 EP 0481279A2 EP 91116744 A EP91116744 A EP 91116744A EP 91116744 A EP91116744 A EP 91116744A EP 0481279 A2 EP0481279 A2 EP 0481279A2
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Prior art keywords
mandrel
profile
bending
station
bent
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EP91116744A
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German (de)
French (fr)
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EP0481279B1 (en
EP0481279A3 (en
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Walter Späth
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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 relates to a spatial roll-stretch bending process in connection with a mandrel bending station and to the device for carrying out the process, the profile to be bent first being clamped at both ends and subjected to a pretension and then the profile being bent, and in this case at least one profile roll of a profile rolling station in the forming area pressed to the profile and three-dimensionally tracked.
  • the essence of the invention is therefore that the mandrel bending station or the one or more mandrels of this station perform the same, possibly three-dimensional movement of the profile rollers of the profile roller station. Accordingly, as soon as the profile rolls are tracked three-dimensionally on the profile to be bent, the mandrel is likewise moved three-dimensionally. This movement in the area of the bending mandrel was previously unknown in the prior art. In the previously known methods, only a stationary mandrel was used. In the invention, however, the mandrel moves in all room levels, i.e. in the X, Y and in the direction of rotation and follows the movement of the profile rollers, the profile rollers being pressed from the outside onto the profile to be bent or onto the bending mandrel.
  • the cavity of the profile is generally known to be filled in with a mandrel during the bending process, however, these methods usually only take place in a single bending plane. It is only known here to bend such simple profiles in the plane with a constant radius, the mandrel bending station remaining with the mandrel. It is known to arrange the mandrel holding station stationary beyond the workpiece clamping station, and to guide the mandrel to be held, which fills the closed or partially open cross section of the profile to be bent, through the clamping station in order to introduce this mandrel into the workpiece and to hold it in the workpiece .
  • the mandrel always remains in the same place, namely at the bending point, and that the mandrel bending station (or mandrel holding station) is therefore also fixed when bending uniform radii. After bending, the mandrel can be hydraulically withdrawn from the bending zone so that the bent workpiece can be easily removed.
  • the object of the present invention is therefore to provide a method for operating a mandrel bending station and a mandrel bending station for carrying out the method in such a way that closed or partially open profiles can be bent using the known spatial roll-stretch bending method.
  • the method is thereby used to solve the problem characterized in that the mandrel bending station moves in motion congruence with the profile roller station, which profile roller station with corresponding profile rollers lies opposite the workpiece on the bending template and that the mandrel held in the cross section of the workpiece to be bent is rotatably mounted, for example, in the mandrel bending station.
  • the mandrel is positively received in the profile to be bent and that a mandrel holding rod engages in the mandrel, which is connected to the mandrel via a pivot bearing.
  • the mandrel is non-rotatably connected to the mandrel holding rod and that the mandrel holding rod is rotatably held in the mandrel bending station.
  • the mandrel is non-rotatably connected to the mandrel holding rod and that the mandrel rod is positively controlled rotatably connected to the mandrel bending station and moves congruently with the clamping head to the left or right to initiate a torsion.
  • the method according to the invention is not only for the known RASB method (spatial roll-stretch-bending process), but also for an ASB process (roll-stretch-bending process) in which the profile is bent only in one level, e.g. the XY plane, while in the other RASB method the bend is made in a total of 3 spatial axes (X, Y, Z) with a possible additional torsion option.
  • This torsion option is also possible with the known ASB processes. This makes it possible to curve through the moving XY axis to bend different bending radii. Instead, it is also possible to generate the bend in the XY plane not by moving the axis of rotation, but by moving the profile roller station relative to the bending point.
  • This clamping station thus follows the workpiece itself when the profile is "wound up" on the bending template in the longitudinal direction of the workpiece, that is to say in the X direction, while the mandrel bending station or mandrel holding station has a completely different function, which consists in the mandrel always in motion -Congruence with the profile roller station at the bending point of the workpiece to be bent.
  • the holding station therefore makes the same movement in the Y direction as the roller bending station and the mandrel bending station, but only in the Y direction, while the clamping station executes a completely different movement sequence in the X direction.
  • protection is also claimed for special mandrel shapes which are held and guided by the mandrel bending station.
  • the mandrel is a simple, rod-shaped tool which, in accordance with the two previously described exemplary embodiments, is either rotatably mounted on a mandrel holding rod or is fastened in a rotationally fixed manner to a mandrel holding rod, which in turn (in this second exemplary embodiment) is rotatably received in the receiving chuck of the mandrel holding station.
  • a third embodiment provides for the mandrel to be rotated under forced control.
  • the mandrel holding rod can be rotatably stored in a receiving chuck of the mandrel holding station or, in the third embodiment, rotated in a positively controlled manner.
  • a further embodiment of a mandrel is provided.
  • double profiles can also be bent with the mandrel holding station.
  • Double profiles of this type are two coaxially guided profiles which are at a mutual radial distance from one another.
  • a correspondingly adapted mandrel is necessary, for which separate protection is claimed in the context of the present invention.
  • Such a mandrel initially consists of an inner mandrel holding rod which is connected to an inner mandrel in accordance with the two previously mentioned exemplary embodiments. This inner mandrel serves to support the inner profile of the inner one Coaxial profile tube.
  • a further profile-shaped mandrel is provided, which extends into the space between the outer circumference of the inner profile and the inner circumference of the outer profile is inserted and moved synchronously with the inner mandrel.
  • the outer profile mandrel has a separate mandrel holding rod, which is accordingly also designed as a hollow profile tube and coaxially surrounds the other, radially inner mandrel holding rod.
  • the two mandrel holding rods are therefore clamped into one another in the mandrel holding station according to the invention as coaxial profile tubes.
  • coaxial hollow profiles can be bent at the same time, always ensuring that the radial space between the inner profile and the outer profile remains constant, regardless of the bending radius and the bending shape in the three spatial levels.
  • double mandrel bending station or double mandrel holding station can also be used in conventionally known standard systems, e.g. after the ASB process, and can also be used in normal pipe mandrel bending systems, such as those used in exhaust pipe production.
  • the profile shape of the mandrels is adapted to the cross section of the profile to be bent. This means that any profile shapes of workpieces can be bent and a profile shape of the mandrel must accordingly be selected, which is positively on the inner circumference of the workpiece to be bent.
  • the profile shape of the inner mandrel deviates from the profile shape of the outer mandrel, so that coaxial profiles can also be bent, the coaxially internal profile being completely has a different profile shape than the coaxial external profile.
  • the inner circumference of the coaxially inner profile is shaped differently than the outer circumference of this profile and that the inner circumference of the coaxially outer profile is shaped differently than its outer circumference.
  • the inner and outer surfaces of the mandrels lying coaxially one inside the other are then selected in accordance with these different possibilities.
  • the system essentially consists of a bending tool 1, which is firmly attached to a turntable 2.
  • the workpiece 16 to be bent bears positively on the outer circumference of the bending tool 1.
  • the turntable 2 is rotatably driven and is otherwise received by a turntable bracket 3 which is fastened to a slide 4 which can be moved in the Z direction.
  • the slide guide of the Z-slide 4 in turn is held pivotably in a pivot bearing 5, which pivot bearing 5 is rotatably driven about the axis 6.
  • the profile roller bending station 7 is shifted downward in the direction of the arrow X in order to make the bending point visible.
  • the workpiece itself is not shown in FIG. 1, but the mandrel arrangement feeding in the interior of the workpiece.
  • the mandrel arrangement here consists of a mandrel 15 which is arranged on the front of a mandrel holding rod 14.
  • the mandrel holding rod 14 extends through a clamping head 18 of a clamping station 12 and is received in the holding head 19 of a mandrel bending station 13.
  • the workpiece 16 to be bent is, on the one hand, clamped firmly on the bending tool 1 on the turntable 2 and, on the other hand, is clamped firmly with its other end in the clamping head 18 of the clamping station 12.
  • Figure 2 of the profile roll bending station only a curved rail 10 is shown, in which the brackets for the Profile rollers 8 are added. Furthermore, the bending point 9 is shown schematically, so that it can be seen that the profile rollers 8 are arranged in the profile roller bending station 7 so that they always follow the bending point 9 moving in the three spatial levels.
  • FIG. 3 shows a first embodiment of the mounting of a mandrel 15 on a mandrel holding rod 14. It can be seen that the mandrel 15 bears in a form-fitting manner in the inner profile of the workpiece 16 and the mandrel 15 is rotatably connected to the mandrel holding rod 14 via a pivot bearing 17, which in turn is connected is rotatably received in the holding head 19 of the mandrel bending station 13.
  • the mandrel 15 is connected in a rotationally fixed manner to the mandrel holding rod 14, for example by means of a thread, and that the mandrel holding rod 14 is then rotatably mounted in the holding head 19 by means of a pivot bearing (not shown).
  • FIG. 4 shows a double mandrel arrangement as used according to the invention for bending in the X, Y and Z directions of coaxial tubes.
  • an inner profile 21 is in the inner circumference of an outer profile 22 arranged, the two profiles a space 23 between them form.
  • the double mandrel arrangement consists of an outer hollow mandrel 22 which is inserted into the space 23 between the inner circumference of the outer profile 22 and the outer circumference of the inner profile 21.
  • the hollow mandrel 20 is connected via the two previously described storage methods to a hollow mandrel holding rod 24, which in turn is received in the holding head 19 of the mandrel bending station 13.
  • the outer circumference of the mandrel 15 bears in a form-fitting manner on the inner circumference of the inner profile 21, which in turn is connected to the mandrel holding rod 14 via the two previously described holding options.
  • the mandrel holding rod 14 is guided coaxially in the interior of the hollow mandrel rod 24 and is also received in the holding head 19 of the mandrel bending station 13.
  • the bending point 9 remains stationary in the Z plane because the workpiece 16 itself moves in the Z direction on the rotary table.
  • the bending point 9 therefore only moves in the X or Y direction, depending on which contour is intended for the workpiece to be bent.
  • the profile roller station only has to move in the X or Y direction; as well as the clamping station 12 and the mandrel bending station 13.
  • Such a double-profile tube arrangement is thus held in the clamping station 12 with a correspondingly coaxial clamping head 18, whereby after the bending has been carried out and after the application of possibly several bends in series, an arbitrarily spatially shaped double profile can be bent, always ensuring that the two profiles remain the same Have space 23 also in the bending point.
  • profiles of any shape can be bent in the three spatial axes, the profiles - if it is a coaxial arrangement - can have different external and internal profiles, and despite these different profiles when used accordingly profiled mandrels can also be bent such complicated profile shapes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The invention describes a method of three-dimensional roll-stretch-bending in combination with a mandrel bending station and the corresponding apparatus for this purpose, the section to be bent first of all being clamped at both ends and subjected to a prestress and the section then being bent, at least one shaping roller being pressed against the section in the shaping region and adjusted in three dimensions. In order also to be able to bend closed or partially open sections, the mandrel bending station, having one or more mandrels around which the section to be bent is bent, is moved in the same direction as the shaping rollers, which are pressed against the mandrel bending station from the outside. <IMAGE>

Description

Die Erfindung betrifft ein räumliches Abrollstreckbiegeverfahren in Zusammenhang mit einer Dornbiegestation und die Vorrichtung zur Durchführung des Verfahrens, wobei das zu biegende Profil zunächst an beiden Enden eingespannt und einer Vorspannung unterworfen wird und im weiteren das Profil gebogen wird und hierbei im Umformbereich mindestens eine Profilrolle einer Profilrollstation an das Profil angepresst und dreidimensional nachgeführt wird.The invention relates to a spatial roll-stretch bending process in connection with a mandrel bending station and to the device for carrying out the process, the profile to be bent first being clamped at both ends and subjected to a pretension and then the profile being bent, and in this case at least one profile roll of a profile rolling station in the forming area pressed to the profile and three-dimensionally tracked.

Stand der Technik ist also ein oben angegebenes Verfahren zum räumlichen Abroll-Streckbiegen. Wenn man mit einem derartigen Verfahren Hohlprofile oder Profile mit hinterschnittenen Hohlräumen biegen will, dann besteht die Gefahr, daß diese Profile beim Biegen zusammenfallen und ihre Profilform verlieren.The state of the art is therefore a method for spatial roll-stretch bending specified above. If you want to bend hollow profiles or profiles with undercut cavities with such a method, there is a risk that these profiles will collapse during bending and lose their profile shape.

Das Wesen der Erfindung liegt demnach darin, daß die Dornenbiegestation bzw. der eine oder die mehreren Dorne dieser Station die gleichartige, evtl. dreidimensionale Bewegung der Profilrollen der Profilrollenstation durchführen. Sobald demnach die Profilrollen dreidimensional an dem zu biegenden Profil nachgeführt werden, wird in gleicher Weise der Biegedorn ebenfalls dreidimensional bewegt. Beim Stand der Technik war diese Bewegung im Raum des Biegedorns bislang unbekannt. Bei den bisher bekannten Verfahren wurde lediglich ein stillstehender Dorn verwendet. Bei der Erfindung jedoch bewegt sich der Dorn bei Bedarf in allen Raumebenen, d.h. in X-,Y- und in Drehrichtung und folgt hierbei der Bewegung der Profilrollen nach, wobei die Profilrollen von außen auf das zu biegende Profil bzw. auf den Biegedorn angepresst sind.The essence of the invention is therefore that the mandrel bending station or the one or more mandrels of this station perform the same, possibly three-dimensional movement of the profile rollers of the profile roller station. Accordingly, as soon as the profile rolls are tracked three-dimensionally on the profile to be bent, the mandrel is likewise moved three-dimensionally. This movement in the area of the bending mandrel was previously unknown in the prior art. In the previously known methods, only a stationary mandrel was used. In the invention, however, the mandrel moves in all room levels, i.e. in the X, Y and in the direction of rotation and follows the movement of the profile rollers, the profile rollers being pressed from the outside onto the profile to be bent or onto the bending mandrel.

Zwar ist es bei Hohlprofilen allgemein bekannt, den Hohlraum des Profils während des Biegevorgangs mit einem Dorn auszufüllen, jedoch finden diese Verfahren in der Regel nur in einer einzigen Biegeebene statt. Hierbei ist es lediglich bekannt, derartige einfache Profile in der Ebene mit gleichbleibendem Radius zu biegen, wobei die Dornbiegestation mit dem Dorn stehen bleibt. Hierbei ist es bekannt, die Dornhaltestation feststehend jenseits der Werkstückeinspannstation anzuordnen, und den zu haltenden Dorn, welcher den geschlossenen oder teilweise offenen Querschnitt des zu biegenden Profils ausfüllt, durch die Einspannstation hindurch zu führen, um diesen Dorn in das Werkstück einzubringen und im Werkstück festzuhalten. Wichtig beim Stand der Technik ist, daß der Dorn stets an der gleichen Stelle stehenbleibt, nämlich im Biegepunkt, und daß deshalb bei der Biegung gleichmässiger Radien auch die Dornbiegestation (bzw. Dornhaltestation) feststeht. Der Dorn kann nach dem Biegen aus der Biegezone hydraulisch zurückgezogen werden, damit das gebogene Werkstück leicht entnommen werden kann.In the case of hollow profiles, the cavity of the profile is generally known to be filled in with a mandrel during the bending process, however, these methods usually only take place in a single bending plane. It is only known here to bend such simple profiles in the plane with a constant radius, the mandrel bending station remaining with the mandrel. It is known to arrange the mandrel holding station stationary beyond the workpiece clamping station, and to guide the mandrel to be held, which fills the closed or partially open cross section of the profile to be bent, through the clamping station in order to introduce this mandrel into the workpiece and to hold it in the workpiece . It is important in the prior art that the mandrel always remains in the same place, namely at the bending point, and that the mandrel bending station (or mandrel holding station) is therefore also fixed when bending uniform radii. After bending, the mandrel can be hydraulically withdrawn from the bending zone so that the bent workpiece can be easily removed.

Eine derartige bekannte, feststehende Dornbiegestation ist jedoch mit den Biegeverfahren, wie es in dem amerikanischen Patent 4.941.338 oder in dem deutschen Patent 3.618.701 beschrieben ist, nicht anwendbar.However, such a known, fixed mandrel bending station cannot be used with the bending processes as described in American Patent 4,941,338 or German Patent 3,618,701.

Würde man eine derartige Anlage zum Biegen von geschlossenen oder teilweise offenen Profilen verwenden und hierbei eine feststehende Dornhaltestation verwenden, dann würde das zu biegende Werkstück und das Werkzeug zerstört werden, weil der Dorn eine Relativbewegung im zu biegenden Werkstück ausführt und die Biegungen deshalb nicht angebracht werden könnten.If you were to use such a system for bending closed or partially open profiles and use a fixed mandrel holding station, the workpiece and the tool to be bent would be destroyed because the mandrel makes a relative movement in the workpiece to be bent and the bends are therefore not made could.

Aufgabe der vorliegenden Erfindung ist es deshalb, ein Verfahren zum Betrieb einer Dornbiegestation und eine Dornbiegestation zur Ausübung des Verfahrens so auszubilden, daß geschlossene oder teilweise offene Profile mit dem bekannten räumlichen Abrollstreck-Biegeverfahren gebogen werden können.The object of the present invention is therefore to provide a method for operating a mandrel bending station and a mandrel bending station for carrying out the method in such a way that closed or partially open profiles can be bent using the known spatial roll-stretch bending method.

Zur Lösung der gestellten Aufgabe ist das Verfahren dadurch gekennzeichnet, daß sich die Dornbiegestation in Bewegungs-Kongruenz mit der Profilrollenstation bewegt, welche Profilrollenstation mit entsprechenden Profilrollen gegenüberliegend zum Werkstück an der Biegeschablone anliegt und daß der im Querschnitt des zu biegenden Werkstücks formschlüssig gehaltene Dorn drehbar z.B. in der Dornbiegestation gelagert ist.The method is thereby used to solve the problem characterized in that the mandrel bending station moves in motion congruence with the profile roller station, which profile roller station with corresponding profile rollers lies opposite the workpiece on the bending template and that the mandrel held in the cross section of the workpiece to be bent is rotatably mounted, for example, in the mandrel bending station.

Mit der drehbaren Lagerung des Dornes in der Dornbiegestation gibt es hierbei zwei verschiedene Ausführungsformen.With the rotatable mounting of the mandrel in the mandrel bending station, there are two different embodiments.

In einer ersten Ausführungsform ist vorgesehen, daß der Dorn formschlüssig in dem zu biegenden Profil aufgenommen ist und daß in den Dorn eine Dornhaltestange eingreift, die über ein Drehlager mit dem Dorn verbunden ist.In a first embodiment it is provided that the mandrel is positively received in the profile to be bent and that a mandrel holding rod engages in the mandrel, which is connected to the mandrel via a pivot bearing.

In einer anderen Ausführungsform ist vorgesehen, daß der Dorn drehfest mit der Dornhaltestange verbunden ist und daß die Dornhaltestange drehbar in der Dornbiegestation gehalten ist.
In einer dritten Ausführungsform ist vorgesehen, daß der Dorn drehfest mit der Dornhaltestange verbunden ist und daß die Dorhaltestange zwangsgesteuert drehbar mit der Dornbiegestation verbunden ist und sich kongruent mit dem Einspannkopf nach links oder rechts zur Einleitung einer Torsion bewegt.In another embodiment it is provided that the mandrel is non-rotatably connected to the mandrel holding rod and that the mandrel holding rod is rotatably held in the mandrel bending station.
In a third embodiment it is provided that the mandrel is non-rotatably connected to the mandrel holding rod and that the mandrel rod is positively controlled rotatably connected to the mandrel bending station and moves congruently with the clamping head to the left or right to initiate a torsion.

Wichtig bei der vorliegenden Erfindung ist, daß das erfindungsgemässe Verfahren nicht nur für das bekannte RASB-Verfahren (räumliches Abroll-Streck-Biegeverfahren) ist, sondern auch für ein ASB-Verfahren (Abroll-Streck-Biegeverfahren), bei dem die Biegung des Profils nur in einer Ebene, z.B. der XY-Ebene, erfolgt, während bei dem anderen RASB-Verfahren die Biegung in insgesamt 3 Raumachsen (X,Y,Z) mit einer ggf. noch zusätzlich vorhandenen Torsionsmöglichkeit erfolgt.It is important in the present invention that the method according to the invention is not only for the known RASB method (spatial roll-stretch-bending process), but also for an ASB process (roll-stretch-bending process) in which the profile is bent only in one level, e.g. the XY plane, while in the other RASB method the bend is made in a total of 3 spatial axes (X, Y, Z) with a possible additional torsion option.

Diese Torsionsmöglichkeit ist auch bei den bekannten ASB-Verfahren möglich. Damit ist es möglich, durch die sich bewegende XY-Achse Kurven unterschiedlicher Biegeradien zu biegen. Ebenso ist es stattdessen möglich, die Biegung in der XY-Ebene nicht durch eine Bewegung der Drehachse, sondern durch eine Bewegung der Profilrollenstation relativ zum Biegepunkt zu erzeugen.This torsion option is also possible with the known ASB processes. This makes it possible to curve through the moving XY axis to bend different bending radii. Instead, it is also possible to generate the bend in the XY plane not by moving the axis of rotation, but by moving the profile roller station relative to the bending point.

Bei beiden Verfahren ist wichtig, daß die Dornbiegestation nach der technischen Lehre der vorliegenden Erfindung in genauer Bewegungs-Kongruenz zu der Profilrollenstation sich bewegt, um den Dorn evtl. dreidimensional (X+Y-Richtung plus Drehbewegung) beweglich, stets im Biegepunkt des zu biegenden Profils für alle Biegebewegungen zu halten.In both methods it is important that the mandrel bending station moves according to the technical teaching of the present invention in exact movement congruence to the profile roller station in order to possibly move the mandrel three-dimensionally (X + Y direction plus rotary movement), always at the point of bending Keep profiles for all bending movements.

Entsprechend der Offenbarung des Anmelders z.B. in der US-4.941.338 oder in dem deutschen Patent 3.618.701 ist bekannt, daß die werkstückseitige Einspannstation auf den Drehtisch eine Bewegung sowohl in X- als auch in Y-Richtung ausführen kann.According to the applicant's disclosure e.g. in US-4,941,338 or in German Patent 3,618,701 it is known that the workpiece-side clamping station on the rotary table can perform a movement in both the X and Y directions.

Diese Einspannstation folgt also beim "Aufwickeln" des Profils auf die Biegeschablone in Längsrichtung des Werkstückes dem Werkstück selbst nach, also in X-Richtung, während die erfindungsgemässe Dornbiegestation bzw. Dornhaltestation eine völlig andere Funktion hat, die darin besteht, den Dorn stets in Bewegungs-Kongruenz mit der Profilrollenstation im Biegepunkt des zu biegenden Werkstückes zu halten.This clamping station thus follows the workpiece itself when the profile is "wound up" on the bending template in the longitudinal direction of the workpiece, that is to say in the X direction, while the mandrel bending station or mandrel holding station has a completely different function, which consists in the mandrel always in motion -Congruence with the profile roller station at the bending point of the workpiece to be bent.

Die Haltestation macht also die gleiche Bewegung in Y-Richtung, wie die Rollenbiegestation und die Dornbiegestation, jedoch nur in Y-Richtung, während die Einspannstation in X-Richtung einen völlig anderen Bewegungsablauf ausführt.The holding station therefore makes the same movement in the Y direction as the roller bending station and the mandrel bending station, but only in the Y direction, while the clamping station executes a completely different movement sequence in the X direction.

Nach der vorliegenden Erfindung wird auch Schutz für besondere Dornformen beansprucht, die von der Dornbiegestation gehalten und bewegungsgeführt werden.According to the present invention, protection is also claimed for special mandrel shapes which are held and guided by the mandrel bending station.

In einer ersten, einfachen Ausführungsform ist der Dorn als einfaches, stangenförmiges Werkzeug ausgeführt, welches entsprechend den beiden vorher beschriebenen Ausführungsbeispielen entweder auf einer Dornhaltestange drehbar gelagert ist oder drehfest mit einer Dornhaltestange befestigt ist, die ihrerseits (bei diesem zweiten Ausführungsbeispiel) drehbar in dem Aufnahmefutter der Dornhaltestation aufgenommen ist. In einer dritten Ausführung ist vorgesehen, den Dorn zwangsgesteuert zu drehen.In a first, simple embodiment, the mandrel is a simple, rod-shaped tool which, in accordance with the two previously described exemplary embodiments, is either rotatably mounted on a mandrel holding rod or is fastened in a rotationally fixed manner to a mandrel holding rod, which in turn (in this second exemplary embodiment) is rotatably received in the receiving chuck of the mandrel holding station. A third embodiment provides for the mandrel to be rotated under forced control.

Bisher war eine drehbar Lagerung des Dornes auf der Dornhaltestange nicht notwendig, weil ja bisher nur in einer einzigen Ebene mit gleichmässigem Radius gebogen wurde.Up to now, a rotatable mounting of the mandrel on the mandrel support rod was not necessary, because so far only a single plane with a uniform radius has been bent.

Nachdem aber bei dem bekannten RASB-Verfahren eine dreidimensionale Biegebewegung stattfindet, ist es nun gemäss der vorliegenden Erfindung notwendig, den Dorn drehbar auf der Dornhaltestation (entsprechend der ersten Ausführungsform) zu lagern oder - entsprechend der zweiten Ausführungsform - den Dorn zwar drehfest mit der Dornhaltestange zu verbinden, die Dornhaltestange aber ihrerseits drehbar in einem Aufnahmefutter der Dornhaltestation zu lagern oder in der dritten Ausführung zwangsgesteuert zu drehen.However, after a three-dimensional bending movement takes place in the known RASB method, it is now necessary according to the present invention to mount the mandrel rotatably on the mandrel holding station (according to the first embodiment) or - according to the second embodiment - to rotate the mandrel non-rotatably with the mandrel holding rod to connect, but in turn the mandrel holding rod can be rotatably stored in a receiving chuck of the mandrel holding station or, in the third embodiment, rotated in a positively controlled manner.

Nach einer zweiten Ausführungsform, für die gesonderter Schutz im Rahmen der vorliegenden Erfindung beansprucht wird, ist eine weitere Ausführung eines Dornes vorgesehen.
Erfindungsgemäss ist nämlich vorgesehen, daß mit der Dornhaltestation auch Doppelprofile gebogen werden können. Derartige Doppelprofile sind zwei koaxial ineinander geführte Profile, die einen gegenseitigen, radialen Abstand voneinander einnehmen. Um derartige Doppelprofile zu biegen, ist ein dementsprechend angepasster Dorn notwendig, für den gesonderter Schutz im Rahmen der vorliegenden Erfindung beansprucht wird. Ein derartiger Dorn besteht zunächst aus einer inneren Dornhaltestange, welche entsprechend den beiden vorher genannten Ausführungsbeispielen mit einem inneren Dorn verbunden ist. Dieser innere Dorn dient zur Abstützung des Innenprofils des inneren Koaxialprofilrohres.According to a second embodiment, for which separate protection is claimed in the context of the present invention, a further embodiment of a mandrel is provided.
According to the invention it is namely provided that double profiles can also be bent with the mandrel holding station. Double profiles of this type are two coaxially guided profiles which are at a mutual radial distance from one another. In order to bend such double profiles, a correspondingly adapted mandrel is necessary, for which separate protection is claimed in the context of the present invention. Such a mandrel initially consists of an inner mandrel holding rod which is connected to an inner mandrel in accordance with the two previously mentioned exemplary embodiments. This inner mandrel serves to support the inner profile of the inner one Coaxial profile tube.

Um die beiden Koaxialprofilrohre synchron miteinander und in gleichmässigem Abstand bezüglich des Zwischenraumes zwischen den beiden Profilen biegen zu können (also bezüglich des Abstandes zwischen dem Innen- und dem Außenprofilrohr) ist ein weiterer profilförmiger Dorn vorgesehen, der in den Zwischenraum zwischen dem Außenumfang des inneren Profiles und dem Innenumfang des äußeren Profiles eingeschoben wird und synchron mit dem inneren Dorn bewegt wird.In order to be able to bend the two coaxial profile tubes synchronously with one another and at an even distance with respect to the space between the two profiles (i.e. with regard to the distance between the inner and outer profile tubes), a further profile-shaped mandrel is provided, which extends into the space between the outer circumference of the inner profile and the inner circumference of the outer profile is inserted and moved synchronously with the inner mandrel.

Der äußere Profildorn hat eine gesonderte Dornhaltestange, die dementsprechend ebenfalls als Hohlprofilrohr ausgebildet ist, und die andere, radial innenliegende Dornhaltestange koaxial umgibt.The outer profile mandrel has a separate mandrel holding rod, which is accordingly also designed as a hollow profile tube and coaxially surrounds the other, radially inner mandrel holding rod.

Die beiden Dornhaltestangen sind also als ineinander geführte Koaxialprofilrohre in der erfindungsgemässen Dornhaltestation eingespannt.The two mandrel holding rods are therefore clamped into one another in the mandrel holding station according to the invention as coaxial profile tubes.

Mit dem erfindungsgemässen Doppeldorn können also koaxiale Hohlprofile gleichzeitig gebogen werden, wobei stets sichergestellt ist, daß der radiale Zwischenraum zwischen dem Innenprofil und dem Außenprofil konstant bleibt, unabhängig vom Biegeradius und von der Biegeform in den drei Raumebenen.With the double mandrel according to the invention, coaxial hollow profiles can be bent at the same time, always ensuring that the radial space between the inner profile and the outer profile remains constant, regardless of the bending radius and the bending shape in the three spatial levels.

Es wird noch hinzugefügt, daß eine derartige Doppeldorn-Biegestation bzw. Doppeldornhaltestation auch in herkömmlich bekannten Standardanlagen, z.B. nach dem ASB-Verfahren, verwendet werden können, und auch in normalen Rohrdornbiegeanlagen, wie sie bei der Auspuffrohrherstellung verwendet werden.It is also added that such a double mandrel bending station or double mandrel holding station can also be used in conventionally known standard systems, e.g. after the ASB process, and can also be used in normal pipe mandrel bending systems, such as those used in exhaust pipe production.

Es wird noch darauf hingewiesen, daß die Profilform der Dorne dem Querschnitt des zu biegenden Profils angepasst ist. D.h. es können beliebige Profilformen von Werkstücken gebogen werden und es muß dementsprechend eine Profilform des Dornes gewählt werden, welche sich formschlüssig an den Innenumfang des zu biegenden Werkstückes anlegt.It should also be noted that the profile shape of the mandrels is adapted to the cross section of the profile to be bent. This means that any profile shapes of workpieces can be bent and a profile shape of the mandrel must accordingly be selected, which is positively on the inner circumference of the workpiece to be bent.

Bei einem Doppeldorn, für den gesonderter Schutz im Rahmen der vorliegenden Erfindung beansprucht wird, ist vorgesehen, daß die Profilform des inneren Dornes von der Profilform des äußeren Dornes abweicht, so daß damit auch koaxiale Profile gebogen werden können, wobei das koaxial innenliegende Profil eine völlig andere Profilform aufweist, als vergleichsweise das koaxial außenliegende Profil.In a double mandrel, for which separate protection is claimed in the context of the present invention, it is provided that the profile shape of the inner mandrel deviates from the profile shape of the outer mandrel, so that coaxial profiles can also be bent, the coaxially internal profile being completely has a different profile shape than the coaxial external profile.

Hierbei kann es vorgesehen sein, daß der Innenumfang des koaxial innenliegenden Profils anders geformt ist, als der Außenumfang dieses Profils und daß ebenso der Innenumfang des koaxial außenliegenden Profils anders geformt ist als dessen Außenumfang. Entsprechend diesen unterschiedlichen Möglichkeiten werden dann die Innen- und Außenflächen der koaxial ineinanderliegenden Dorne gewählt.It can be provided that the inner circumference of the coaxially inner profile is shaped differently than the outer circumference of this profile and that the inner circumference of the coaxially outer profile is shaped differently than its outer circumference. The inner and outer surfaces of the mandrels lying coaxially one inside the other are then selected in accordance with these different possibilities.

Der Erfindungsgegenstand der vorliegenden Erfindung ergibt sich nicht nur aus dem Gegenstand der einzelnen Patentansprüche, sondern auch aus der Kombination der einzelnen Patentansprüche untereinander. Alle in den Unterlagen - einschließlich der Zusammenfassung - offenbarten Angaben und Merkmale, insbesondere die in den Zeichnungen dargestellte räumliche Ausbildung werden als erfindungswesentlich beansprucht, soweit sie einzeln oder in Kombination gegenüber dem Stand der Technik neu sind.The subject matter of the present invention results not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another. All information and features disclosed in the documents - including the summary -, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are new to the prior art, individually or in combination.

Im folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellende Zeichnungen näher erläutert. Hierbei gehen aus den Zeichnungen und ihrer Beschreibung weitere erfindungswesentliche Merkmale und Vorteile der Erfindung hervor.The invention is explained in more detail below with the aid of drawings which illustrate only one embodiment. Further features and advantages of the invention which are essential to the invention emerge from the drawings and their description.

Es zeigen:

Figur 1:
schematisiert in Draufsicht eine Anlage zum räumlichen Abroll-Streckbiegen von Profilen jeglicher Art mit der erfindungsgemässen Dornbiegestation,
Figur 2:
die Seitenansicht der Anlage nach Figur 1 in Richtung des Pfeiles II in Figur 1,
Figur 3:
schematisiert einen Schnitt durch das Vorderteil eines Dornes in Eingriffslage im Werkstück,
Figur 4:
die gleiche Situation wie Figur 3 mit zwei koaxial ineinander geführten Profilen.
Show it:
Figure 1:
schematized in plan view a system for spatial roll-stretch bending of profiles of any kind with the mandrel bending station according to the invention,
Figure 2:
the side view of the system of Figure 1 in the direction of arrow II in Figure 1,
Figure 3:
schematized a section through the front part of a mandrel in the engagement position in the workpiece,
Figure 4:
the same situation as Figure 3 with two coaxially guided profiles.

Die Anlage für das RASB-Verfahren ist beispielsweise im deutschen Patent 3 618 701 oder in dem US 4.941.338 näher beschrieben.The system for the RASB method is described in more detail, for example, in German Patent 3,618,701 or in US 4,941,338.

Es wird hiermit auf diese Beschreibung hingewiesen und sämtliche Merkmale dieser Beschreibung sollen von der vorliegenden Erfindung umfasst werden.Reference is hereby made to this description and all features of this description are intended to be encompassed by the present invention.

Die Anlage besteht im wesentlichen aus einem Biegewerkzeug 1, welches fest auf einem Drehtisch 2 befestigt ist.The system essentially consists of a bending tool 1, which is firmly attached to a turntable 2.

Am Außenumfang des Biegewerkzeugs 1 legt sich das zu biegende Werkstück 16 formschlüssig an.The workpiece 16 to be bent bears positively on the outer circumference of the bending tool 1.

Der Drehtisch 2 ist drehbar angetrieben und im übrigen von einer Drehtischkonsole 3 aufgenommen, die an einem in Z-Richtung verfahrbaren Schlitten 4 befestigt ist.The turntable 2 is rotatably driven and is otherwise received by a turntable bracket 3 which is fastened to a slide 4 which can be moved in the Z direction.

Die Schlittenführung des Z-Schlittens 4 ihrerseits ist in einem Schwenklager 5 schwenkbar gehalten, welches Schwenklager 5 um die Achse 6 drehbar angetrieben ist.The slide guide of the Z-slide 4 in turn is held pivotably in a pivot bearing 5, which pivot bearing 5 is rotatably driven about the axis 6.

Damit ist es möglich, den Drehtisch 2 in Z-Richtung zu bewegen und im übrigen zusätzlich um die Achse 6 vergleichbar einer Y-Achse zu verschwenken.This makes it possible to move the turntable 2 in the Z direction and, moreover, in a manner comparable to a Y axis about the axis 6 swivel.

Die Biegung des Werkstückes 16 erfolgt hierbei im Biegepunkt 9, wobei - in Figur 1 aus zeichnerischen Gründen auseinandergezogen - eine Profilrollen-Biegestation 7 an ihrer Vorderseite Profilrollen 8 aufweist, und diese Profilrollen 8 sich im Biegepunkt 9 kraft- und formschlüssig an das zu biegende Werkstück anlegen.The bending of the workpiece 16 takes place here at the bending point 9, wherein - drawn apart in Figure 1 for drawing reasons - a profile roller bending station 7 has profile rollers 8 on its front side, and these profile rollers 8 at the bending point 9 are non-positively and positively on the workpiece to be bent invest.

In der Darstellung der Figur 1 ist hierbei die Profilrollen-Biegestation 7 in Pfeilrichtung X nach unten verschoben, um den Biegepunkt sichtbar zu machen.In the illustration in FIG. 1, the profile roller bending station 7 is shifted downward in the direction of the arrow X in order to make the bending point visible.

In Figur 1 ist im übrigen das Werkstück selbst nicht dargestellt, sondern die im Werkstückinnenraum zuführende Dornanordnung. Die Dornanordnung besteht hierbei aus einem Dorn 15, der an der Vorderseite einer Dornhaltestange 14 angeordnet ist.The workpiece itself is not shown in FIG. 1, but the mandrel arrangement feeding in the interior of the workpiece. The mandrel arrangement here consists of a mandrel 15 which is arranged on the front of a mandrel holding rod 14.

Die Dornhaltestange 14 greift hierbei durch einen Einspannkopf 18 einer Einspannstation 12 hindurch und ist in dem Haltekopf 19 einer Dornbiegestation 13 aufgenommen.The mandrel holding rod 14 extends through a clamping head 18 of a clamping station 12 and is received in the holding head 19 of a mandrel bending station 13.

Das zu biegende Werkstück 16 wird einerseits fest an dem Biegewerkzeug 1 auf dem Drehtisch 2 eingespannt und andererseits mit seinem anderen Ende fest in dem Einspannkopf 18 der Einspannstation 12 eingespannt.The workpiece 16 to be bent is, on the one hand, clamped firmly on the bending tool 1 on the turntable 2 and, on the other hand, is clamped firmly with its other end in the clamping head 18 of the clamping station 12.

Das Biegen in den drei Raumachsen X,Y,Z erfolgt nun dadurch, daß der Drehtisch entsprechend drehend angetrieben und gleichzeitig der Schlitten 4 in Z-Richtung und ggf. das Schwenklager 5 noch verdreht wird, wobei wichtig ist, daß die Profilrollen-Biegestation 7 entsprechende Bewegungen in den drei Raumachsen ausführt, um das Werkstück 16 in beliebigen Richtungen zu biegen.The bending in the three spatial axes X, Y, Z now takes place in that the rotary table is driven in a correspondingly rotating manner and at the same time the slide 4 is rotated in the Z direction and possibly the pivot bearing 5, it being important that the profile roller bending station 7 executes corresponding movements in the three spatial axes in order to bend the workpiece 16 in any direction.

In der Figur 2 ist von der Profilrollen-Biegestation lediglich eine Kurvenschiene 10 dargestellt, in welcher die Halterungen für die Profilrollen 8 aufgenommen sind. Ferner ist der Biegepunkt 9 schematisiert dargestellt, so daß erkennbar ist, daß die Profilrollen 8 in der Profilrollen-Biegestation 7 so angeordnet sind, daß sie stets dem in den drei Raumebenen sich bewegenden Biegepunkt 9 folgen.In Figure 2 of the profile roll bending station only a curved rail 10 is shown, in which the brackets for the Profile rollers 8 are added. Furthermore, the bending point 9 is shown schematically, so that it can be seen that the profile rollers 8 are arranged in the profile roller bending station 7 so that they always follow the bending point 9 moving in the three spatial levels.

Wichtig ist nun, daß wegen der Wickelbewegung des Biegewerkzeuges 1 auf dem Drehtisch 2 die Einspannstation 12 in Pfeilrichtung X fortschreitend nach links sich auf dem gemeinsamen Schienenbett 11 für die Profilrollen-Biegestation, die Einspannstation 12 und der Dornbiegestation 13 bewegt, während die Dornbiegestation 13 allen Bewegungen der Profilrollen-Biegestation 7 in allen drei Raumachsen X,Y,Z synchron folgt.It is now important that because of the winding movement of the bending tool 1 on the turntable 2, the clamping station 12 progressively moves to the left in the direction of the arrow X on the common rail bed 11 for the profile roller bending station, the clamping station 12 and the mandrel bending station 13, while the mandrel bending station 13 moves all Movements of the profile roll bending station 7 in all three spatial axes X, Y, Z follows synchronously.

Damit ist gewährleistet, daß der Dorn 15, welcher sich im Innenraum des zu biegenden Profils befindet und das Profil dort formschlüssig ausfüllt, genau allen Bewegungen des Biegepunktes 9 folgt.This ensures that the mandrel 15, which is located in the interior of the profile to be bent and fills the profile there in a form-fitting manner, exactly follows all movements of the bending point 9.

Die Figur 3 zeigt eine erste Ausführungsform der Lagerung eines Dornes 15 an einer Dornhaltestange 14. Hierbei ist erkennbar, daß im Innenprofil des Werkstückes 16 der Dorn 15 formschlüssig anliegt und der Dorn 15 über ein Drehlager 17 drehbar mit der Dornhaltestange 14 verbunden ist, die ihrerseits drehfest in dem Haltekopf 19 der Dornbiegestation 13 aufgenommen ist.FIG. 3 shows a first embodiment of the mounting of a mandrel 15 on a mandrel holding rod 14. It can be seen that the mandrel 15 bears in a form-fitting manner in the inner profile of the workpiece 16 and the mandrel 15 is rotatably connected to the mandrel holding rod 14 via a pivot bearing 17, which in turn is connected is rotatably received in the holding head 19 of the mandrel bending station 13.

In einer anderen, nicht zeichnerisch dargestellten Ausführungsform ist es vorgesehen, daß der Dorn 15 beispielsweise über ein Gewinde drehfest mit der Dornhaltestange 14 verbunden ist und daß die Dornhaltestange 14 dann über ein nicht näher dargestelltes Drehlager in dem Haltekopf 19 drehbar gelagert ist.In another embodiment, not shown in the drawing, it is provided that the mandrel 15 is connected in a rotationally fixed manner to the mandrel holding rod 14, for example by means of a thread, and that the mandrel holding rod 14 is then rotatably mounted in the holding head 19 by means of a pivot bearing (not shown).

Die Figur 4 zeigt eine Doppeldornanordnung, wie sie erfindungsgemäss zum Biegen in X-, Y- und Z-Richtung von koaxialen Rohren verwendet wird.FIG. 4 shows a double mandrel arrangement as used according to the invention for bending in the X, Y and Z directions of coaxial tubes.

Hierbei ist im Innenumfang eines Außenprofils 22 ein Innenprofil 21 angeordnet, wobei die beiden Profile einen Zwischenraum 23 zwischen sich ausbilden.Here, an inner profile 21 is in the inner circumference of an outer profile 22 arranged, the two profiles a space 23 between them form.

Um eine derartige Koaxial-Profilanordnung zu biegen, ist erfindungsgemäss eine Doppeldornanordnung vorgesehen.In order to bend such a coaxial profile arrangement, a double mandrel arrangement is provided according to the invention.

Die Doppeldornanordnung besteht aus einem äußeren Hohldorn 22, der in den Zwischenraum 23 zwischen dem Innenumfang des Außenprofils 22 und dem Außenumfang des Innenprofils 21 eingeschoben ist.The double mandrel arrangement consists of an outer hollow mandrel 22 which is inserted into the space 23 between the inner circumference of the outer profile 22 and the outer circumference of the inner profile 21.

Der Hohldorn 20 ist über die beiden vorher beschriebenen Lagerverfahren mit einer Hohldornhaltestange 24 verbunden, die ihrerseits in dem Haltekopf 19 der Dornbiegestation 13 aufgenommen ist.The hollow mandrel 20 is connected via the two previously described storage methods to a hollow mandrel holding rod 24, which in turn is received in the holding head 19 of the mandrel bending station 13.

Andererseits legt sich am Innenumfang des Innenprofils 21 der Außenumfang des Dornes 15 formschlüssig an, der seinerseits über die beiden vorher beschriebenen Haltemöglichkeiten mit der Dornhaltestange 14 verbunden ist.On the other hand, the outer circumference of the mandrel 15 bears in a form-fitting manner on the inner circumference of the inner profile 21, which in turn is connected to the mandrel holding rod 14 via the two previously described holding options.

Die Dornhaltestange 14 ist hierbei koaxial im Innenraum der Hohldornstange 24 geführt und ist ebenfalls in dem Haltekopf 19 der Dornbiegestation 13 aufgenommen.The mandrel holding rod 14 is guided coaxially in the interior of the hollow mandrel rod 24 and is also received in the holding head 19 of the mandrel bending station 13.

Mit der beschriebenen Doppeldornanordnung und der ansich bekannten RASB-Anlage ist es deshalb möglich, koaxiale Profile beliebiger Formgebung in allen drei Raumrichtungen zu biegen.With the double mandrel arrangement described and the known RASB system, it is therefore possible to bend coaxial profiles of any shape in all three spatial directions.

Wichtig bei allen zwei beschriebenen Verfahren (Einfach-Dorn-Anordnung und Doppeldorn-Anordnung) ist, daß der Biegepunkt 9 in der Z-Ebene stationär bleibt, weil das Werkstück 16 selbst auf dem Drehtisch in Z-Richtung sich bewegt. Der Biegepunkt 9 wandert also nur in X- oder Y-Richtung, je nachdem, welche Kontur für das zu biegende Werkstück vorgesehen ist. Demzufolge muß sich auch die Profilrollenstation nur in X- oder Y-Richtung bewegen; ebenso wie die Einspannstation 12 und die Dornbiegestation 13.It is important in all two described methods (single-mandrel arrangement and double-mandrel arrangement) that the bending point 9 remains stationary in the Z plane because the workpiece 16 itself moves in the Z direction on the rotary table. The bending point 9 therefore only moves in the X or Y direction, depending on which contour is intended for the workpiece to be bent. As a result, the profile roller station only has to move in the X or Y direction; as well as the clamping station 12 and the mandrel bending station 13.

Während aber die Einspannstation 12 noch eine zusätzliche Vorschubbewegung in X-Richtung durchführt (wegen der Aufwickelbewegung des Werkstückes 16 auf dem Biegewerkzeug 1), ist diese zusätzliche Bewegung in X-Richtung für die Profilrollenbiegestation 7 und für die Dornbiegestation 13 nicht erforderlich. Diese beiden Stationen 7 und 13 fahren hierbei nach anderen Gesichtspunkten, nämlich nach dem, daß der Biegepunkt 9 stets in der eingezeichneten Lage am Biegewerkzeug 1 gleichbleibend in der Z-Ebene beibehalten werden muß.However, while the clamping station 12 still performs an additional feed movement in the X direction (because of the winding movement of the workpiece 16 on the bending tool 1), this additional movement in the X direction is not necessary for the profile roller bending station 7 and for the mandrel bending station 13. These two stations 7 and 13 drive here from other points of view, namely that the bending point 9 must always be maintained in the position shown on the bending tool 1 in the Z plane.

Eine derartige Doppelprofilrohranordnung wird also mit entsprechend koaxial ausgebildetem Einspannkopf 18 in der Einspannstation 12 gehalten, wobei nach erfolgter Biegung und nach der Anbringung evtl. mehrerer hintereinanderliegenden Biegungen ein beliebig räumlich geformtes Doppelprofil gebogen werden kann, wobei immer sichergestellt wird, daß die beiden Profile den gleichbleibenden Zwischenraum 23 auch im Biegepunkt aufweisen.Such a double-profile tube arrangement is thus held in the clamping station 12 with a correspondingly coaxial clamping head 18, whereby after the bending has been carried out and after the application of possibly several bends in series, an arbitrarily spatially shaped double profile can be bent, always ensuring that the two profiles remain the same Have space 23 also in the bending point.

Zum Anbringen hintereinanderliegender Biegungen muß nur stets dafür gesorgt werden, daß sich die Doppeldornanordnung immer im Biegepunkt 9 befindet.To make bends one behind the other, it is only necessary to ensure that the double mandrel arrangement is always at the bending point 9.

Wichtig ist bei der vorliegenden Erfindung, daß beliebig geformte Profile in den drei Raumachsen gebogen werden können, wobei die Profile - sofern es sich um eine koaxiale Anordnung handelt - unterschiedliche Außen- und Innenprofilierungen haben können, und daß trotz dieser unterschiedlichen Profilierungen bei der Anwendung entsprechend profilierter Dorne auch derartige komplizierte Profilformen gebogen werden können. Beispielsweise ist es möglich, Rippenprofile zu biegen, wo z.B. ein inneres gewelltes Rohr koaxial in einem glatten Außenrohr enthalten ist.It is important in the present invention that profiles of any shape can be bent in the three spatial axes, the profiles - if it is a coaxial arrangement - can have different external and internal profiles, and despite these different profiles when used accordingly profiled mandrels can also be bent such complicated profile shapes. For example, it is possible to bend rib profiles where, for example, an inner corrugated tube is contained coaxially in a smooth outer tube.

ZEICHNUNGS-LEGENDEDRAWING LEGEND

11
BiegewerkzeugBending tool
22nd
DrehtischTurntable
33rd
DrehtischkonsoleTurntable console
44th
Z-SchlittenZ slide
55
SchwenklagerSwivel bearing
66
Achseaxis
77
ProfilrollenbiegestationProfile roll bending station
88th
ProfilrollenProfile rolls
99
BiegepunktBending point
1010th
KurvenschieneCam track
1111
SchienenbettRail bed
1212
EinspannstationClamping station
1414
DornhaltestangeMandrel holding rod
1515
Dornmandrel
1616
Werkstückworkpiece
1717th
Lagerwarehouse
1818th
EinspannkopfClamping head
1919th
HaltekopfHolding head
2020th
HohldornHohldorn
2121
InnenprofilInner profile
2222
AußenprofilOuter profile
2323
ZwischenraumSpace
2424th
HohldornhaltestangeHollow mandrel support rod

Claims (7)

Räumliches Abrollstreck-Biegeverfahren in Zusammenhang mit einer Dornbiegestation, wobei das zu biegende Profil zunächst an beiden Seiten eingespannt und einer Vorspannung unterworfen wird und im weiteren das Profil gebogen wird und hierbei im Umformbereich mindestens eine Profilrolle einer Profilrollenstation an das Profil angepresst und dreidimensional nachgeführt wird, dadurch gekennzeichnet, daß mit einem oder mehreren Dornen (15) eine Dornbiegestation (13) vorgesehen ist, die sich in Bewegungskongruenz mit der Profirollenstation (7) bewegt, welche Profilrollenstation (7) mit entsprechenden Profilrollen (8) gegenüberliegend zum Werkstück an der Biegeschablone anliegt und daß der im Querschnitt des zu biegenden Werkstücks (16) formschlüssig gehaltene Dorn (15) drehbar gelagert ist.Spatial unrolling-stretching process in connection with a mandrel bending station, whereby the profile to be bent is first clamped on both sides and subjected to a pretension and then the profile is bent and at least one profile roller of a profile roller station is pressed against the profile and three-dimensionally adjusted in the forming area , characterized in that with one or more mandrels (15) a mandrel bending station (13) is provided which moves in congruence with the professional roller station (7), which profile roller station (7) lies with corresponding profile rollers (8) opposite the workpiece on the bending template and that the cross-section of the workpiece (16) to be bent, the mandrel (15) is rotatably supported. Vorrichtung zur Durchführung des räumlichen Abrollstreck-Biegeverfahrens in Zusammenhang mit einem oder mehreren Dornen einer Dornenbiegestation, wobei eine Einspannvorrichtung für das zu biegende Profil vorgesehen ist, welches gebogen wird und hierbei mindestens eine dreidimensional (X+Y-Richtung plus Drehbewegung) nachgeführte Profilrolle zur Anpressung an das zu biegende Profil vorgesehen ist, dadurch gekennzeichnet, daß der eine oder die mehreren Dorne (15) der Dornbiegestation (13) eine gleichartige Bewegung wie die Profilrollen (8) der Profilrollenbiegestation (7) durchführen und daß der Dorn (15) drehbar angeordnet ist.Device for carrying out the spatial roll-stretch-bending process in connection with one or more mandrels of a mandrel bending station, wherein a clamping device is provided for the profile to be bent, which is bent and in this case at least one three-dimensional (X + Y direction plus rotary movement) tracking profile roller for pressing is provided on the profile to be bent, characterized in that the one or more mandrels (15) of the mandrel bending station (13) perform the same movement as the profile rollers (8) of the profile roller bending station (7) and that the mandrel (15) is rotatably arranged is. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Dorn (15) formschlüssig in dem zu biegenden Profil aufgenommen ist und daß in den Dorn (15) eine Dornhaltestange (14) eingreift, die über ein Drehlager mit dem Dorn verbunden ist.Apparatus according to claim 2, characterized in that the mandrel (15) is positively received in the profile to be bent and that a mandrel holding rod (14) engages in the mandrel (15) which is connected to the mandrel via a pivot bearing. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Dorn (15) drehfest mit der Dornhaltestange (14) verbunden ist und daß die Dornhaltestange (14) drehbar in der Dornbiegestation (13) in einem Haltekopf (19) gehalten ist.Apparatus according to claim 2, characterized in that the mandrel (15) is non-rotatably connected to the mandrel holding rod (14) and that the mandrel holding rod (14) is rotatably held in a holding head (19) in the mandrel bending station (13). Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Dorn (15) als einfaches, stangenförmiges Werkzeug ausgestattet ist.Device according to claim 2, characterized in that the mandrel (15) is equipped as a simple, rod-shaped tool. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Dorn als Biegedorn für koaxial ineinandergreifende Doppelprofile ausgestaltet ist, wobei eine innere Dornenhaltestange mit einem inneren Dorn vorgesehen ist und zusätzlich ein weiterer profilförmiger Dorn, der in den Zwischenraum zwischen dem Außenumfang des inneren Profils und dem Innenumfang des äußeren Profiles eingeschoben wird, wobei der äußere Profildorn eine Dornhaltestange aufweist, die als Hohlprofil ausgebildet ist.Apparatus according to claim 1, characterized in that the mandrel is designed as a bending mandrel for coaxially interlocking double profiles, an inner mandrel holding rod is provided with an inner mandrel and in addition a further profile-shaped mandrel, which in the space between the outer circumference of the inner profile and the inner circumference of the outer profile is inserted, the outer profile mandrel having a mandrel holding rod which is designed as a hollow profile. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Dorn (15) drehfest mit der Dornhaltestange (14) verbunden ist und daß die Dornhaltestange (14) zwangsgesteuert drehbar mit der Dornbiegestation (13) verbunden ist und sich kongruent mit dem Einspannkopf nach links oder rechts zur Einleitung einer Torsion bewegt.Apparatus according to claim 2, characterized in that the mandrel (15) is non-rotatably connected to the mandrel holding rod (14) and that the mandrel holding rod (14) is rotatably connected to the mandrel bending station (13) and is congruent with the clamping head to the left or right moved to initiate a twist.
EP91116744A 1990-10-18 1991-10-01 Method of spatial roll-stretch-bending in combination with a mandrel bending station Expired - Lifetime EP0481279B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033031 1990-10-18
DE4033031A DE4033031A1 (en) 1990-10-18 1990-10-18 SPACIAL ROLLING AND BENDING METHOD IN CONNECTION WITH A THORN BENDING STATION

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EP0481279A2 true EP0481279A2 (en) 1992-04-22
EP0481279A3 EP0481279A3 (en) 1992-10-21
EP0481279B1 EP0481279B1 (en) 1994-06-08

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EP (1) EP0481279B1 (en)
JP (1) JPH04258318A (en)
AT (1) ATE106783T1 (en)
DE (2) DE4033031A1 (en)
ES (1) ES2057705T3 (en)

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JP4031827B2 (en) * 2002-10-10 2008-01-09 三桜工業株式会社 Double pipe bending method

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FR2121756A1 (en) * 1971-01-12 1972-08-25 Banning J Ag Maschinenf Tube bender - allows bends of defferent radii to be made in a tube using the same tools
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Also Published As

Publication number Publication date
DE4033031A1 (en) 1992-04-23
DE59101858D1 (en) 1994-07-14
EP0481279B1 (en) 1994-06-08
ES2057705T3 (en) 1994-10-16
EP0481279A3 (en) 1992-10-21
US5333481A (en) 1994-08-02
JPH04258318A (en) 1992-09-14
ATE106783T1 (en) 1994-06-15

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