EP2099575B1 - Device for clamping hollow profiles - Google Patents

Device for clamping hollow profiles Download PDF

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Publication number
EP2099575B1
EP2099575B1 EP07856231A EP07856231A EP2099575B1 EP 2099575 B1 EP2099575 B1 EP 2099575B1 EP 07856231 A EP07856231 A EP 07856231A EP 07856231 A EP07856231 A EP 07856231A EP 2099575 B1 EP2099575 B1 EP 2099575B1
Authority
EP
European Patent Office
Prior art keywords
clamping
support core
support
hollow
rod
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.)
Not-in-force
Application number
EP07856231A
Other languages
German (de)
French (fr)
Other versions
EP2099575A2 (en
Inventor
Dirk BÖRGER
Thomas Sondermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tracto Technik GmbH and Co KG
Original Assignee
Tracto Technik GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tracto Technik GmbH and Co KG filed Critical Tracto Technik GmbH and Co KG
Publication of EP2099575A2 publication Critical patent/EP2099575A2/en
Application granted granted Critical
Publication of EP2099575B1 publication Critical patent/EP2099575B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/03—Apparatus with means to keep the profile in shape
    • 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 device for clamping preferably thin-walled hollow profiles during forming, for example, when bending round or square tubes, according to the preamble of claim 1 (see, eg FR-A-2 440 787 ).
  • the wears one from the German patent 39 04 903 C2 known device bill, which consists of a arranged in the interior of the hollow profile slot and surrounding the hollow profile outer clamping device.
  • the slot includes four wedge-shaped clamping pieces whose wedge surfaces are directed so that the clamping pieces move radially when tightening the clamping pieces projecting through a clamping screw and create firm against the inside of the hollow profile.
  • the outer clamping device consists essentially of clamping and pressure plates, which are pressed via clamping screws in Verspannklötzen on the hollow section.
  • This device is extremely expensive and requires a relatively high handling costs.
  • the invention is therefore based on the problem to provide a structurally simple, yet highly effective clamping device for pipes and other hollow sections, which nevertheless allows the introduction of high axial forces.
  • the solution to this problem consists in a clamping device with the features of claim 1.
  • the receiving rod and the support core are preferably formed in one piece.
  • the support rod can be extended and provided at the front end with the mandrel.
  • a support pin 3 at the front end of a support rod 2.
  • the support rod 2 is surrounded at a short distance from the support pin 3 by a support core 4 at the front end of a receiving rod 5.
  • a collet 6 surrounds the tube 1, the longitudinally wedge-shaped sections 7 are pressed in the operating state of an axially displaceable outer, inner conical clamping ring 8 on the tube 1.
  • the tube wall then rests on the stable support core 4, which in turn acts as an abutment for the tube 1.
  • the tube 1 between the collet 6 and the mandrel 3 and a bending roller 9 is supported with a clamping piece 10 outside by a slider 11.
  • the tube 1 is firmly clamped and supported between the support core 4 and the collet 6; it is at most subject to a slight deformation.
  • the support core 4 prevents deformation of the tube 1 even at high axial pressure.
  • the transmittable force can be further increased by the fact that the surfaces of the support core 4 and the sections 7 contacting the tube 1 have an increased coefficient of friction, for example roughened or provided with circumferential ribs.
  • a radially outwardly acting clamping body may be arranged in the pipe, which then cooperates with the collet, or the collet may be replaced in this case by a support tube, which then cooperates with the clamping body arranged in the tube.

Abstract

The invention relates to a device for clamping hollow profiles, for example for the purposes of bending, wherein a support mandrel is arranged on the end of a retainer bar within the hollow profile with a mounting rod for a support core surrounding the retainer bar. A clamping jaw encloses the hollow profile in the region of the support core such that the profile is clamped between the support mandrel and the mounting rod with the support core to one side and the clamping jaw.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Einspannen von vorzugsweise dünnwandigen Hohlprofilen beim Umformen, beispielsweise beim Biegen von Rund- oder Vierkantrohren, gemäß dem Oberbegriff des Anspruchs 1 (siehe z.B. FR-A- 2 440 787 ).The invention relates to a device for clamping preferably thin-walled hollow profiles during forming, for example, when bending round or square tubes, according to the preamble of claim 1 (see, eg FR-A-2 440 787 ).

Um Rohre und andere Hohlprofile mit hoher Kraft in eine Umformzone hineinzudrücken und dort zu halten, sind entsprechend große axial wirksame Kräfte erforderlich, die insbesondere bei dünnwandigen und/oder langen Rohren mit erheblichen Knickkräften verbunden sind. Um die Knickgefahr zu verringern, ist es bekannt, die axiale Preßkraft möglichst nahe an der Umformzone in das Rohr einzuleiten. Dies geschieht mit Hilfe eines äußeren, die axiale Längskraft übertragenden Klemmechanismus. Die erforderliche Nachdrückkraft erfordert eine hohe radial wirkende Klemmkraft und/oder eine große axiale Länge der Klemmvorrichtung. Hierfür steht häufig nicht die erforderliche Rohrlänge vor der Umformzone zur Verfügung, oder es ist ein zusätzlicher Rohrabschnitt zur Übertragung der Klemmkraft erforderlich, der anschließend verworfen wird. Hinzu kommt, daß dünnwandige Rohre insbesondere bei kurzen Klemmlängen mit entsprechend hoher radialer Krafteinleitung die dabei auftretenden Belastungen nicht aufnehmen können und sich daher verformen.In order to push pipes and other hollow profiles with high force in a forming zone and to hold there, correspondingly large axially effective forces are required, which are particularly associated with thin-walled and / or long pipes with considerable bending forces. In order to reduce the risk of buckling, it is known to introduce the axial compressive force as close to the forming zone in the tube. This is done by means of an external, the axial longitudinal force transmitted clamping mechanism. The required pushing force requires a high radial clamping force and / or a large axial length of the clamping device. For this is often not the required length of pipe before the forming available, or it is an additional pipe section for transmitting the clamping force required, which is then discarded. In addition, thin-walled tubes can not absorb the loads occurring in particular with short clamping lengths with a correspondingly high radial force introduction and therefore deform.

Dem trägt eine aus der deutschen Patentschrift 39 04 903 C2 bekannte Vorrichtung Rechnung, die aus einem im Innern des Hohlprofils angeordneten Einschub und einer das Hohlprofil umgebenden äußeren Spannvorrichtung besteht. Der Einschub umfaßt vier keilförmige Klemmstücke, deren Keilflächen so gerichtet sind, daß sich die Klemmstücke beim Anziehen einer die Klemmstücke durchragenden Spannschraube radial bewegen und fest an die Innenseite des Hohlprofils anlegen.The wears one from the German patent 39 04 903 C2 known device bill, which consists of a arranged in the interior of the hollow profile slot and surrounding the hollow profile outer clamping device. The slot includes four wedge-shaped clamping pieces whose wedge surfaces are directed so that the clamping pieces move radially when tightening the clamping pieces projecting through a clamping screw and create firm against the inside of the hollow profile.

Die äußere Einspannvorrichtung besteht im wesentlichen aus Einspann- und Druckplatten, die über Einspannschrauben in Verspannklötzen auf das Hohlprofil gepreßt werden.The outer clamping device consists essentially of clamping and pressure plates, which are pressed via clamping screws in Verspannklötzen on the hollow section.

Diese Vorrichtung ist außerordentlich aufwendig und erfordert einen verhältnismäßig hohen Handhabungsaufwand.This device is extremely expensive and requires a relatively high handling costs.

Der Erfindung liegt daher das Problem zugrunde, eine konstruktiv einfache, jedoch hochwirksame Einspannvorrichtung für Rohre und andere Hohlprofile zu schaffen, die dennoch das Einleiten hoher Axialkräfte erlaubt.The invention is therefore based on the problem to provide a structurally simple, yet highly effective clamping device for pipes and other hollow sections, which nevertheless allows the introduction of high axial forces.

Die Lösung dieses Problems besteht in einer Einspannvorrichtung mit den Merkmalen des Anspruchs 1. Die Aufnahmestange und der Stützkern sind vorzugsweise einstückig ausgebildet. Die Haltestange kann dabei verlängert und am vorderen Ende mit dem Stützdorn versehen sein.The solution to this problem consists in a clamping device with the features of claim 1. The receiving rod and the support core are preferably formed in one piece. The support rod can be extended and provided at the front end with the mandrel.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des näheren erläutert. In der Zeichnung zeigen:

  • Fig. 1 eine schematische Darstellung der erfindungsgemäßen Einspannvorrichtung für eine Biegemaschine und
  • Fig. 2 eine perspektivische Außenansicht der erfindungsgemäßen Vorrichtung mit einem rohrförmigen Hohlprofil.
The invention is explained below with reference to an embodiment shown in the drawing of the closer. In the drawing show:
  • Fig. 1 a schematic representation of the clamping device according to the invention for a bending machine and
  • Fig. 2 an external perspective view of the device according to the invention with a tubular hollow profile.

In einem zum Biegen vorgesehenen Rohr 1 befindet sich am vorderen Ende einer Haltestange 2 ein Stützdorn 3. Die Haltestange 2 ist mit geringem Abstand von dem Stützdorn 3 von einem Stützkern 4 am vorderen Ende einer Aufnahmestange 5 umgeben. Im Bereich des Stützkerns 4 umgibt eine Spannzange 6 das Rohr 1, deren in Längsrichtung keilförmigen Sektionen 7 im Betriebszustand von einem axial verschiebbaren äußeren, innen konischen Spannring 8 auf das Rohr 1 gepreßt werden. Die Rohrwandung ruht dann auf dem stabilen Stützkern 4, der seinerseits als Widerlager für das Rohr 1 fungiert. Zudem ist das Rohr 1 zwischen der Spannzange 6 und dem Stützdorn 3 bzw. einer Biegerolle 9 mit einem Klemmstück 10 außen durch ein Gleitstück 11 abgestützt. Das Rohr 1 ist zwischen dem Stützkern 4 und der Spannzange 6 fest eingespannt und abgestützt; es unterliegt dabei allenfalls einer geringen Verformung. Auf diese Weise verhindert der Stützkern 4 ein Verformen des Rohrs 1 auch bei hoher axialer Druckkraft. Dabei läßt sich die übertragbare Kraft noch dadurch erhöhen, daß die das Rohr 1 kontaktierenden Flächen des Stützkerns 4 und der Sektionen 7 einen erhöhten Reibwert besitzen, beispielsweise aufgerauht oder mit umlaufenden Rippen versehen sind.In a pipe 1 intended for bending, there is a support pin 3 at the front end of a support rod 2. The support rod 2 is surrounded at a short distance from the support pin 3 by a support core 4 at the front end of a receiving rod 5. In the region of the support core 4, a collet 6 surrounds the tube 1, the longitudinally wedge-shaped sections 7 are pressed in the operating state of an axially displaceable outer, inner conical clamping ring 8 on the tube 1. The tube wall then rests on the stable support core 4, which in turn acts as an abutment for the tube 1. In addition, the tube 1 between the collet 6 and the mandrel 3 and a bending roller 9 is supported with a clamping piece 10 outside by a slider 11. The tube 1 is firmly clamped and supported between the support core 4 and the collet 6; it is at most subject to a slight deformation. On In this way, the support core 4 prevents deformation of the tube 1 even at high axial pressure. In this case, the transmittable force can be further increased by the fact that the surfaces of the support core 4 and the sections 7 contacting the tube 1 have an increased coefficient of friction, for example roughened or provided with circumferential ribs.

Bei der erfindungsgemäßen Vorrichtung kann auch ein radial nach außen wirkender Spannkörper im Rohr angeordnet sein, der dann mit der Spannzange zusammenwirkt, oder die Spannzange kann in diesem Falle auch durch ein Stützrohr ersetzt sein, das dann mit dem im Rohr angeordneten Spannkörper zusammenwirkt.In the apparatus according to the invention, a radially outwardly acting clamping body may be arranged in the pipe, which then cooperates with the collet, or the collet may be replaced in this case by a support tube, which then cooperates with the clamping body arranged in the tube.

Claims (6)

  1. Device for clamping hollow sections (1) having a supporting rod (2) and a clamping gripper (6) encompassing the hollow section, as well as a support mandrel (3), characterised by an accommodating rod (5) for a support core (4), which accommodating rod (5) encloses the supporting rod, wherein the clamping gripper (6) encloses the support core (4) such that the hollow section (1) is supported between the support core (4) and the clamping gripper (6).
  2. Device according to Claim 1, characterised by a support mandrel (3) arranged at the front end of the accommodating rod (5).
  3. Device according to Claim 1 or 2, characterised in that the accommodating rod (5) and the support core (4) are designed as one piece.
  4. Device according to any one of Claims 1 to 3, characterised in that the contact surfaces of the support core (4) and the clamping gripper (6) with the hollow profile (1) are provided roughened or with transverse ribs.
  5. Device according to any one of Claims 1 to 4, characterised in that the clamping gripper (6) consists of an internally conical clamping ring (8) and of an externally conical clamping body (6)
  6. Device according to Claim 5, characterised in that the clamping body (6) consists of sections (7).
EP07856231A 2006-11-23 2007-11-22 Device for clamping hollow profiles Not-in-force EP2099575B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006055671A DE102006055671B4 (en) 2006-11-23 2006-11-23 Device for clamping hollow profiles
PCT/EP2007/010143 WO2008061762A2 (en) 2006-11-23 2007-11-22 Device for clamping hollow profiles

Publications (2)

Publication Number Publication Date
EP2099575A2 EP2099575A2 (en) 2009-09-16
EP2099575B1 true EP2099575B1 (en) 2010-03-17

Family

ID=39338729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07856231A Not-in-force EP2099575B1 (en) 2006-11-23 2007-11-22 Device for clamping hollow profiles

Country Status (4)

Country Link
EP (1) EP2099575B1 (en)
AT (1) ATE460999T1 (en)
DE (2) DE102006055671B4 (en)
WO (1) WO2008061762A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105149467B (en) * 2015-09-10 2017-06-13 东莞市瀚百模具五金有限公司 The stem reducing mould of positioning in a kind of pipe
CN107755563A (en) * 2017-12-18 2018-03-06 张家港兴宇机械制造有限公司 Pipe fitting clamping mechanism in bending machine
CN114346022B (en) * 2021-12-16 2023-12-26 东风汽车集团股份有限公司 Aluminum profile stretch bending core rod structure and design method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1924412U (en) * 1965-07-06 1965-09-30 Mannesmann Ag GUIDE OR SUPPORT DEVICE FOR USE IN THE MANUFACTURING OF LONGITUDINAL SEAM WELDED PIPES.
DE1527447A1 (en) * 1965-11-02 1969-06-12 Rohrwerke Bitterfeld Veb Device for the continuous production of pipe bends with a small bending radius
CH578720A5 (en) * 1973-05-15 1976-08-13 Sarmac Sa
FR2293997A1 (en) * 1974-12-09 1976-07-09 Prvni Brnenska Strojirna Activating device for impaling tubes onto mandrel of bending machine - has hydraulically operated interconnected gripping jaws and pivoting linkage system (OE150176)
SE7811607L (en) * 1978-11-10 1980-05-11 Arenco Parts Ab CHARGING DEVICE FOR LOADING TUBES OR PROFILES IN A TUBE OR PROFILE BENDING MACHINE EQUIPPED TO WORK WITH INTERNAL CONTROL
DE3904903C2 (en) * 1989-02-17 1994-07-28 Fraunhofer Ges Forschung Device for clamping thin-walled hollow profiles

Also Published As

Publication number Publication date
EP2099575A2 (en) 2009-09-16
WO2008061762A2 (en) 2008-05-29
WO2008061762A3 (en) 2008-07-10
DE102006055671B4 (en) 2010-11-25
ATE460999T1 (en) 2010-04-15
DE102006055671A1 (en) 2008-06-05
DE502007003190D1 (en) 2010-04-29

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