EP0481279B1 - Procédé de pliage spatial par roulage et étirage en combinaison avec une machine de pliage à mandrin - Google Patents

Procédé de pliage spatial par roulage et étirage en combinaison avec une machine de pliage à mandrin Download PDF

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Publication number
EP0481279B1
EP0481279B1 EP91116744A EP91116744A EP0481279B1 EP 0481279 B1 EP0481279 B1 EP 0481279B1 EP 91116744 A EP91116744 A EP 91116744A EP 91116744 A EP91116744 A EP 91116744A EP 0481279 B1 EP0481279 B1 EP 0481279B1
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EP
European Patent Office
Prior art keywords
mandrel
profile
bending
station
bent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91116744A
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German (de)
English (en)
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EP0481279A2 (fr
EP0481279A3 (en
Inventor
Walter Späth
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Individual
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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.
  • 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 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 fixedly 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 design 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 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 bending of the profile 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. It is also possible instead 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.
  • the mandrel bending station moves according to the technical teaching of the present invention in exact congruence of movement with 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.
  • This clamping station thus follows the workpiece itself when the profile is "wound" onto 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, according to the two previously described exemplary embodiments, is either rotatably mounted on a mandrel holding rod or is rotatably fastened with 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 is 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.
  • a further embodiment of a mandrel is provided.
  • double profiles can also be bent with the mandrel holding station.
  • Such double profiles are two coaxially guided profiles that are at a mutual radial distance from each other.
  • a correspondingly adapted mandrel is required, 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 exemplary embodiments mentioned above. 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. according to the ASB process, and also in normal mandrel bending systems, such as those used in exhaust pipe manufacture.
  • the profile shape of the mandrels is adapted to the cross section of the profile to be bent. This means that any profile shape 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 it can also be used to bend coaxial profiles, the coaxial 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 in a form-fitting manner 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 pivotally held 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, firmly clamped on the bending tool 1 on the rotary table 2 and, on the other hand, is clamped firmly at the other end in the clamping head 18 of the clamping station 12.
  • FIG. 2 only one curved rail 10 is shown of the profile roller bending station, in which the holders 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 is 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 provided 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)

Claims (7)

  1. Procédé de pliage spatial par roulage et étirage en combinaison avec une machine de pliage à mandrin (13), dans lequel le profilé à plier (16) est d'abord serré sur les deux côtés et est soumis à une pré-contrainte et ensuite le profilé (16) est plié et à cet effet au moins un rouleau profilé (8) d'une machine à rouleaux profilés (7) est appuyé sur le profilé (16) dans la zone de déformation et est ensuite déplacé suivant trois dimensions, caractérisé en ce qu'il est prévu une machine de pliage à mandrin (13) avec un ou plusieurs mandrins (15), qui se déplace de concert avec la machine à rouleaux profilés (7), machine à rouleaux profilés (7) qui s'appuie sur le gabarit de pliage en face de la pièce par des rouleaux profilés (8) correspondants et en ce que le mandrin (15) maintenu pour fixer la forme dans la section de la pièce à plier (16) est rotatif dans son support.
  2. Dispositif pour la mise en oeuvre du procédé de pliage spatial par roulage et étirage en combinaison avec un ou plusieurs mandrins (15, 20) d'une machine de pliage à mandrins (13), dans lequel il est prévu un dispositif de serrage (12) pour le profilé (16) à plier, lequel est plié et où il est prévu à cet effet au moins un rouleau profilé (8) déplacé suivant trois dimensions (directions X + Y + mouvement de rotation) à appuyer sur le profil (16) à plier, caractérisé en ce que le mandrin unique ou les mandrins multiples (15) de la machine de pliage à mandrins (13) exécutent un mouvement identique à celui des rouleaux profilés (8) de la machine de pliage à rouleaux profilés (7) et en ce que le mandrin (15) est rotatif.
  3. Dispositif suivant la revendication 2, caractérisé en ce que le mandrin (15) est logé pour fixer la forme dans le profilé à plier et en ce qu'une barre porte-mandrin (14) s'engage dans le mandrin (15), laquelle est assemblée au mandrin par un palier rotatif.
  4. Dispositif suivant la revendication 2, caractérisé en ce que le mandrin (15) est assemblé sans rotation avec la barre porte-mandrin (14) et en ce que la barre porte-mandrin (14) est rotative dans une tête de support (19) dans la machine de pliage à mandrins (13).
  5. Dispositif suivant la revendication 2, caractérisé en ce que le mandrin (15) est constitué par un outil simple en forme de barre.
  6. Dispositif suivant la revendication 2, caractérisé en ce que le mandrin est constitué par un mandrin de pliage pour des profilés doubles (21, 22) engagés co-axialement l'un dans l'autre, dans lequel il est prévu une barre porte-mandrin intérieure (14) avec un mandrin intérieur (15) et en plus un mandrin supplémentaire profilé (20), qui est inséré dans l'espace intermédiaire (23) entre la surface latérale extérieure du profilé intérieur (21) et la surface latérale intérieure du profilé extérieur (22), le mandrin profilé extérieur (20) présentant une barre porte-mandrin (24) qui est constituée par un profilé creux.
  7. Dispositif suivant la revendication 2, caractérisé en ce que le mandrin (15) est assemblé sans rotation avec la barre porte-mandrin (14) et en ce que la barre porte-mandrin (14) est assemblée par une liaison rotative à commande forcée avec la machine de pliage à mandrins (13) et se déplace de concert avec la tête de serrage vers la gauche ou la droite pour l'application d'une torsion.
EP91116744A 1990-10-18 1991-10-01 Procédé de pliage spatial par roulage et étirage en combinaison avec une machine de pliage à mandrin Expired - Lifetime EP0481279B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033031A DE4033031A1 (de) 1990-10-18 1990-10-18 Raeumliches abroll-streckbiegeverfahren in zusammenhang mit einer dornbiegestation
DE4033031 1990-10-18

Publications (3)

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

Family

ID=6416517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91116744A Expired - Lifetime EP0481279B1 (fr) 1990-10-18 1991-10-01 Procédé de pliage spatial par roulage et étirage en combinaison avec une machine de pliage à mandrin

Country Status (6)

Country Link
US (1) US5333481A (fr)
EP (1) EP0481279B1 (fr)
JP (1) JPH04258318A (fr)
AT (1) ATE106783T1 (fr)
DE (2) DE4033031A1 (fr)
ES (1) ES2057705T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4140591A1 (de) * 1991-12-10 1993-06-17 Walter E Spaeth Streckbiegeverfahren zur biegung von hohlprofilen und profildorn-streckbiegemaschine
JP4031827B2 (ja) * 2002-10-10 2008-01-09 三桜工業株式会社 二重管の曲げ方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE162751C (fr) *
US1587931A (en) * 1923-10-11 1926-06-08 Wolders Cornelis Theodorus Tube-bending machine
US1982164A (en) * 1932-12-08 1934-11-27 Gustav A Hoener Bending machine
US3121538A (en) * 1960-11-28 1964-02-18 Westinghouse Electric Corp Coil winding apparatus
US3339391A (en) * 1964-12-04 1967-09-05 Ben C Kowalski Stretch bending machine
DE1627531C3 (de) * 1967-09-01 1974-08-22 Arog Armaturen + Apparate + Roehren Gmbh, 4630 Bochum-Gerthe Einrichtung zur Herstellung von Mantelrohrbogen
DE2101162A1 (de) * 1971-01-12 1972-07-20 J. Banning Ag, 4700 Hamm Rohrbiegemaschine
US4009601A (en) * 1975-01-24 1977-03-01 K.K. Shimizu Seisakusho Method of and apparatus for bending a double pipe
DE2746721C3 (de) * 1977-10-18 1981-03-19 Schwarze, Rigobert, Dipl.-Ing., 5000 Köln Rohrbiegemaschine
US4238945A (en) * 1978-12-22 1980-12-16 Rigobert Schwarze Apparatus for bending a jacketed tube
DE3415077C1 (de) * 1984-04-21 1985-09-05 Schmitz & Brill GmbH & Co. KG, 5950 Finnentrop Verfahren zum Herstellen von doppelwandigen,gekruemmten Rohrabschnitten fuer Abgasanlagen an Kraftfahrzeugen od.dgl. und Werkzeug zur Durchfuehrung des Verfahrens
DE3618701A1 (de) * 1986-06-04 1987-12-10 Spaeth Gmbh & Co Kg Stahlbau B Verfahren und vorrichtung zum kaltumformen von profilen aus eisen- und nichteisenmetallen
DE3719033C2 (de) * 1987-06-06 1995-09-14 Schwarze Rigobert Rohrbiegemaschine mit Biegedorn

Also Published As

Publication number Publication date
DE4033031A1 (de) 1992-04-23
EP0481279A2 (fr) 1992-04-22
DE59101858D1 (de) 1994-07-14
US5333481A (en) 1994-08-02
JPH04258318A (ja) 1992-09-14
ES2057705T3 (es) 1994-10-16
EP0481279A3 (en) 1992-10-21
ATE106783T1 (de) 1994-06-15

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