EP1401595B1 - Procede et dispositif pour determiner la geometrie spatiale d'un profile extrude cintre - Google Patents

Procede et dispositif pour determiner la geometrie spatiale d'un profile extrude cintre Download PDF

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Publication number
EP1401595B1
EP1401595B1 EP02754778A EP02754778A EP1401595B1 EP 1401595 B1 EP1401595 B1 EP 1401595B1 EP 02754778 A EP02754778 A EP 02754778A EP 02754778 A EP02754778 A EP 02754778A EP 1401595 B1 EP1401595 B1 EP 1401595B1
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EP
European Patent Office
Prior art keywords
bending
extrusion profile
central axis
straight
feeding
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
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EP02754778A
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German (de)
English (en)
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EP1401595A1 (fr
Inventor
Ralf WARNEMÜNDE
Dirk Berndt
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Tracto Technik GmbH and Co KG
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Tracto Technik GmbH and Co KG
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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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/14—Wrinkle-bending, i.e. bending by corrugating
    • 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
    • B21D7/14—Bending rods, profiles, or tubes combined with measuring of bends or lengths

Definitions

  • the invention relates to a method and a device for determining the geometry of a curved extruded profile, in particular a pipe, the in the region along a first rectilinear central axis (A) of the extruded profile in one Feeding and fixing unit held and by means of a bending device to a predetermined bending angle ⁇ is bent such that on one side of a caused by the bending curved portion of the extruded profile of the Area of the first rectilinear central axis (A) and at the opposite Page an area with a second rectilinear central axis (B) (see, for example, DE-A-19712685).
  • Extruded profiles in the above sense are available by the meter, bar-like molded elements, the manufacturing and material-related along their extension have a minimum rigidity and that for spatial purposes Deformation can be subjected to a plastic bending process by the a permanent plastic bending deformation in the sense of a remaining curvature arises.
  • this relates to pipes or extruded profiles made of solid material, which Metal exist and which it applies individually depending on their later Verwednung to deform.
  • the other versions relate mainly to pipes as hollow pipes consisting of plastically deformable material, preferably metal but can the following explanations also on extruded profiles of other geometries and Shapes are transferred, in which the spatial form changing measures too are meeting.
  • pipes are in the form of piping systems for the transmission or Conduction of gaseous or liquid media and indicate depending on local Conditions along their extension curvatures or pipe bends.
  • pipes are in the form of piping systems for the transmission or Conduction of gaseous or liquid media and indicate depending on local Conditions along their extension curvatures or pipe bends.
  • pipes are in the form of piping systems for the transmission or Conduction of gaseous or liquid media and indicate depending on local Conditions along their extension curvatures or pipe bends.
  • pipes are in the form of piping systems for the transmission or Conduction of gaseous or liquid media and indicate depending on local Conditions along their extension curvatures or pipe bends.
  • metal manufactured piping system which filled with brake fluid for the Transmission of braking forces is used.
  • To be such a piping system high demands on tightness and mechanical stability, so that the mostly running over several meters of pipes made in one piece are, despite the provision of a variety of bends and curves along the respective course of the pipeline, due to the very limited prevailing at the motor vehicle Course conditions
  • Bending machines can be basically divided into two categories, namely bending machines with stationary Bending head, in which the pipe to be bent usually consists of two bending jaws existing stationary bending head is fed via a feeding and fixing unit and plastically deformed by merging the two bending jaws becomes.
  • Bending machines of the other category provide a moving bending head, in which relative to a fixed tube, a translational and rotational Moving bending head is moved, the appropriate place against the pipe is crimped locally to make a bend.
  • tactile Measuring systems are so-called coordinate measuring machines or articulated measuring arms, by means of derer curved tube surface on a variety of surface areas scanned punctiform, with a number of three-dimensional Coordinate points are obtained relative to a reference coordinate system, from the following mathematical aprpoximation a complete Geometry of the bent pipe can be calculated.
  • contactless methods provide for the curved tube using point or line triangulation or Photogrammetry method to scan, also with mathematical Evaluation methods to determine the tube geometry.
  • a pipe bending machine with one of a Slider-supported bending head described which is a first to a housing of the Bending head stationary bending roller and a second arranged on a bending arm Bending roll has.
  • the axes of the bending rollers are parallel to each other and perpendicular to the axis of the pipe to be bent.
  • an angle encoder provided, via which the bending angle ( ⁇ ) of the bending arm can be detected.
  • the respective position of the bending arm with bending roller is by the angle encoder transmitted to a circuit, wherein by a desired-actual-value comparison the bending angle is determined.
  • a step further goes here DE 197 46 219 A1, in which a bending machine for Bending of rod-shaped material is described.
  • the rod-shaped Material in particular a pipe, is on a portion and at one of this Section subsequent to be bent pipe section held. Subsequently, will bent to be bent pipe section by a predetermined angle and the Springback of the bent pipe is measured, so that the pipe if necessary can be bent.
  • US 5,992,210 is a device for bending an endless tube strand described.
  • the device has a feed unit, one each Fixing unit for the pipe section to be bent and not to be bent and a swing arm through which the pipe section to be bent in the desired Shape is brought. After the bending process, the fixing device is located on the Swivel arm is located, solved and detected by sensors the shape produced.
  • bent Pipes only have low intrinsic stability, leaving them without further Auxiliary templates for supporting the dead weight in their actual curved Room shape can not be measured.
  • the invention is based on the object, a method and an apparatus for Determination of the geometry of a curved extruded profile, which is in the area along a first rectilinear central axis (A) of the extruded profile in a feed and Held fixing and by means of a bending device to a predetermined Bending angle ⁇ is bent such that on one side of one by the bend caused region of the extruded profile of the region of the first rectilinear Central axis (A) and on the opposite side an area with a second rectilinear central axis (B), specify such that when provided a plurality along the tube to be performed successively bending operations every single bending angle should be determined exactly.
  • the process now consists in carrying out the determination of spatial Position of the central axis (B) after completion of the bending process takes place, ie after the pipe is released from the bending device, allowing material-related Springback effects during the measurement process can be detected, and while the Pipe remains fixed or held in the feeding and fixing unit.
  • the tube thus remains during the measurement in a by the supply and fuser defines fixed position. Only then is it possible that after Completing the measuring process the pipe starting from the "frozen" Measuring position controlled in a subsequent bending position relative to Bending device can be spent, so that a subsequent bending process under solid spatial reference to the previous bending process performed on the pipe can be.
  • the determined bending angle ⁇ is compared with a predetermined desired bending angle ⁇ soll . If it turns out that deviations occur that go beyond a tolerance range also given, a signal is generated, which is used for a number of other measures.
  • the feed lengths along the tube between two consecutive Bending operations to capture accurate knowledge of each other Distance between two curved pipe sections to obtain.
  • the angle of rotation with a suitable angle of rotation measuring device measure the pipe along its central axis (A) during two Bending positions is rotated.
  • measuring the angle of rotation is not essential to the measure a possible twist between two consecutive bending operations to investigate. Since, as described above, the spatial position of the central axis B can be determined from this information not only in the by both Center axes A and B described lying bending angle ⁇ are determined, but also that angle to which the tube relative to the normal plane to Center axis A is bent.
  • a carrying out the above bending operation according to the invention Bending device for bending a strand profile with a feed and Fxierech, by which the extruded profile can be fed and fixed as a straight piece by the meter and with one of the feeding and fixing unit in the feed direction along a rectilinear Central axis (A) of the extruded profile downstream bending device, with a at least two bending bodies existing bending head, which during the Bending the force applied to the extruded profile locally at least partially enclose and in an extruded profile releasing, open position are transferable, characterized by the fact that a measuring sensor with a fixed Spatial reference to the feeding and fixing unit and / or provided to the bending device is the spatial position of a rectilinear central axis (B) of the extruded profile in Area directly on the bending device in the feed direction of the extruded profile subsequently recorded.
  • a memory and evaluation unit is provided, in the measured values of the measuring sensor can be stored and evaluated such that a Angle ⁇ , the so-called bending angle, can be determined by the center axes (A) and (B) is included. In this way it can be guaranteed that even after completion of the bending process information about the actual Room shape of the curved extruded profile are obtained, the one another Evaluation can be supplied.
  • FIG. 1 schematically shows a device for bending or bending a tube 1 and for detecting the geometry of the space through the Bending process curved pipe course.
  • the metered pipe 1 passes through a feed unit 2, consisting of two Wälzrollen, in as Counter-holder formed fixing unit 3, through which the tube 1 along its straight center axis A is pushed.
  • a bending device 4 consisting of an inner bending jaw 41 and outer bending jaw 42 provided, which can be transferred to the introduction of the tube 1 in an open position are.
  • the bending jaws 41 and 42 are in the closed position shown.
  • the bending process of the tube 1 by means of the bending device 4 takes place such that the outer jaw 42 is the tube in a region to be bent 11 by rotation (see arrow) against the inner bending jaw 41 deformed.
  • a straight pipe section 5 before the bending process oriented along the central axis A, inclined from the original central axis A. and has a rectilinear central axis B after the bend.
  • the one of the Central axes A and B included angle ⁇ corresponds to the bending angle that it is to be determined exactly after completion of the bending process.
  • the measurement of the bending angle ⁇ is carried out by determining the spatial position of Central axis B, which adjoins the currently curved pipe section 5.
  • the sensor 6 is a laser sensor based on the triangulation technique, which has a Camera unit 61 and two formed as line laser light sources 62 has. With the help of an optical system, not shown, this light section sensor 6 projects on the Surface of the pipe each have one line per light source 62, through the Camera unit 61 is detected. With the help of the light section sensor 6 are along the light lines 3-D points on the pipe surface determined from which Cylinder approximation, the cylinder center axis, the so-called. Center axis B, is determined. The spatial position of the central axis A can be assumed to be known, especially this defined by the feeding and fixing unit 2, 3 and the bending device 4 is.
  • Flattening can be achieved by means of the bending process, which it jeodch is to be specifically avoided, for example, by correcting Biegeparametem in another Bending or corrections with corre sponding.
  • the course of the neutral fiber 7 within the tube 1, in particular in the area the bends 5, in which the neutral fiber 7 from the tube center in Direction of the inner radius shifts, is used in determining the length of the straight sections 5 are taken into account in the form of parameters.
  • the parameters will be depending on the bending angle, pipe diameter, pipe material and Pipe wall thickness determined.
  • the apparatus shown in Figure 1 for determining the geometric shape of Tubes during the bending process in the machine allows for immediate Quality assessment of the shape and shape of a bent pipe. Especially Bending angle errors occurring during the bending process are detected immediately. Cause of this error is in particular a springback of the bent pipe after the bending process which among other things by fluctuations of Material properties is caused.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Claims (27)

  1. Procédé pour déterminer la géométrie spatiale d'un profil extrudé courbé, qui est maintenu le long d'un premier axe central (A) rectiligne dans la région du profil extrudé dans une unité d'alimentation et de fixage et courbé au moyen d'un dispositif de courbage autour d'un angle de pliage α prédéfini, de sorte que, d'un côté d'une région courbée provoquée par la courbure du profil extrudé, la région du premier axe central (A) rectiligne et, du côté opposé, une région avec un deuxième axe central (B) rectiligne se rejoignent, caractérisé en ce que la position spatiale du deuxième axe central (B) rectiligne est déterminée par rapport à la position spatiale connue du premier axe central (A) rectiligne du profil extrudé, pendant que le profil extrudé est maintenu de façon stable par l'unité d'alimentation et de fixage et que la région courbée du profil extrudé est libérée par le dispositif de courbage, et en ce que l'angle de pliage α est déterminé par le croisement des deux axes (A) et (B).
  2. Procédé selon la revendication 1, caractérisé en ce que le profil extrudé est amené comme marchandise au mètre dans le sens de la longueur à l'unité d'alimentation et de fixage sous une forme rectiligne non courbée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la détermination de la position spatiale du deuxième axe central (B) rectiligne est exécutée à l'aide d'un procédé de mesure sans contact.
  4. Procédé selon la revendication 3, caractérisé en ce qu'un procédé de coupe optique en 3D reposant sur la triangulation est utilisé comme procédé de mesure sans contact, dans lequel plusieurs points d'espace sont déterminés dans la région de l'axe central (B) rectiligne sur la surface du profil extrudé et la position spatiale de l'axe central (B) est déterminée à l'aide d'une approximation mathématique.
  5. Procédé selon la revendication 4, caractérisé en ce que l'approximation mathématique repose sur la minimalisation de la somme du plus petit carré d'erreurs.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'angle de pliage α est déterminé au moyen de la triangulation.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'angle de pliage α déterminé est comparé à un angle de pliage théorique αthéorique et en ce qu'un signal est généré en cas d'écart avec la zone de tolérance.
  8. Procédé selon la revendication 7, caractérisé en ce que le signal est utilisé pour corriger des paramètres de courbure qui commandent l'opération de courbage par le dispositif de courbage.
  9. Procédé selon la revendication 8, caractérisé en ce que les paramètres de courbage corrigés sont utilisés pour une opération de courbage ultérieure au niveau de la région déjà courbée du profil extrudé pour une correction ultérieure.
  10. Procédé selon la revendication 7 ou 8, caractérisé en ce que les paramètres de courbage corrigés sont mis à disposition d'autres opérations de courbage le long du profil extrudé.
  11. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que le profil extrudé est déplacé et/ou tourné le long de l'unité d'alimentation et de fixage après l'exécution de la détermination de l'angle de pliage α,
       en ce qu'une autre opération de courbage analogue à la première opération de courbage est exécutée au niveau d'une autre position dans la région le long du premier axe central (A) rectiligne du profil extrudé, et
       en ce qu'un angle de pliage α' obtenu par l'autre opération de courbage est déterminé de la même façon que dans la revendication 1.
  12. Procédé selon la revendication 11, caractérisé en ce qu'un grand nombre d'opérations de courbage sont exécutées les unes après les autres avec déterminations respectives des angles de pliage correspondant.
  13. Procédé selon la revendication 11 ou 12, caractérisé en ce que l'avancement du profil extrudé le long de l'unité d'alimentation et de fixage est entre deux opérations de courbage successives, est saisi.
  14. Procédé selon l'une quelconque des revendications 11 à 13, caractérisé en ce que l'angle de rotation, autour duquel le profil extrudé est pivoté entre deux opérations de courbage successives, est saisi.
  15. Procédé selon la revendication 14, caractérisé en ce que la géométrie spatiale complète du profil extrudé courbé est déterminée, après l'exécution d'un grand nombre d'opérations de courbage, à partir de toutes les données saisies, à savoir l'angle de pliage, les longueurs d'avancement et/ou l'angle de rotation.
  16. Procédé selon l'une quelconque des revendications 1 à 15, caractérisé en ce que le profil extrudé est saisi dans sa forme transversale.
  17. Procédé selon la revendication 15, caractérisé en ce que la géométrie spatiale du profil extrudé courbé saisie par une technique de mesure est comparée à une géométrie spatiale théorique prédéfinie, et
       en ce qu'une détermination de la qualité est réalisée en fonction de la comparaison.
  18. Dispositif pour courber un profil extrudé avec une unité d'alimentation et de fixage, par laquelle le profil extrudé peut être alimenté et fixé comme marchandise au mètre rectiligne, ainsi qu'avec un dispositif de courbage subordonné à l'unité d'alimentation et de fixage dans le sens de l'alimentation le long d'un axe central (A) rectiligne du profil extrudé, avec une tête de courbage composée d'au moins deux corps de courbage, qui, pendant l'opération de courbage, englobent le profil extrudé à courber alimenté en énergie localement au moins partiellement et peuvent être amenés en une position ouverte libérant le profil extrudé,
       caractérisé en ce qu'un capteur de mesure avec un revêtement spatial fixe est prévu pour l'unité d'alimentation et de fixage et/ou le dispositif de courbage, capteur qui saisit ensuite la position spatiale d'un axe central (B) rectiligne du profil extrudé dans la région indirectement au niveau du dispositif de courbage dans le sens d'alimentation du profil extrudé, et
       en ce qu'une unité d'enregistrement et d'analyse est prévue, dans laquelle des valeurs de mesure du capteur de mesure peuvent être enregistrées et analysées, de sorte qu'un angle α, c'est-à-dire l'angle de pliage, peut être déterminé, angle qui est compris entre les axes centraux (A) et (B).
  19. Dispositif selon la revendication 18, caractérisé en ce que le capteur de mesure est relié à l'unité d'alimentation et de fixage ou au dispositif de courbage.
  20. Dispositif selon la revendication 18 ou 19, caractérisé en ce que le capteur de mesure est un capteur de mesure optique.
  21. Dispositif selon la revendication 20, caractérisé en ce que le capteur de mesure optique comporte au moins deux sources lumineuses et au moins un capteur sensible à la lumière.
  22. Dispositif selon la revendication 21, caractérisé en ce que le capteur sensible à la lumière est un capteur à résolution tridimensionnel.
  23. Dispositif selon l'une quelconque des revendications 20 à 22, caractérisé en ce que le capteur de mesure optique est un capteur à triangulation laser.
  24. Dispositif selon l'une quelconque des revendications 18 à 23, caractérisé en ce qu'une unité de mesure de la distance parcourue est prévue dans la région de l'axe central (A) rectiligne, unité qui saisit un avancement en longueur du profil extrudé par rapport à l'unité d'alimentation et de fixage.
  25. Dispositif selon l'une quelconque des revendications 18 à 24, caractérisé en ce qu'une unité de mesure de l'angle de rotation est prévue dans la région de l'axe central (A) rectiligne, unité qui saisit un angle de rotation autour duquel le profil extrudé pivote par rapport à l'axe central (A) rectiligne.
  26. Dispositif selon l'une quelconque des revendications 18 à 25, caractérisé en ce que, dans l'unité d'enregistrement et d'analyse, des valeurs de mesure de l'unité de mesure de la distance parcourue et de l'angle de rotation peuvent être enregistrées et analysées, de sorte que la géométrie spatiale complète du profil extrudé peut être déterminée lorsque l'angle de pliage α est connu.
  27. Dispositif selon l'une quelconque des revendications 18 à 26, caractérisé en ce que le profil extrudé est formé comme matériau tubulaire ou plat.
EP02754778A 2001-06-27 2002-06-27 Procede et dispositif pour determiner la geometrie spatiale d'un profile extrude cintre Expired - Lifetime EP1401595B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10130937 2001-06-27
DE10130937A DE10130937C1 (de) 2001-06-27 2001-06-27 Verfahren und Vorrichtung zur Ermittlung der Raumgeometrie eines gebogenen Strangprofils
PCT/EP2002/007121 WO2003002280A1 (fr) 2001-06-27 2002-06-27 Procede et dispositif pour determiner la geometrie spatiale d'un profile extrude cintre

Publications (2)

Publication Number Publication Date
EP1401595A1 EP1401595A1 (fr) 2004-03-31
EP1401595B1 true EP1401595B1 (fr) 2005-09-14

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EP02754778A Expired - Lifetime EP1401595B1 (fr) 2001-06-27 2002-06-27 Procede et dispositif pour determiner la geometrie spatiale d'un profile extrude cintre

Country Status (5)

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US (1) US7489412B2 (fr)
EP (1) EP1401595B1 (fr)
AT (1) ATE304416T1 (fr)
DE (2) DE10130937C1 (fr)
WO (1) WO2003002280A1 (fr)

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US10293396B2 (en) * 2017-05-17 2019-05-21 Jason Edward Smith Viewing tool used in the operation of hand bending pipe
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CN113624102A (zh) * 2021-08-27 2021-11-09 绍兴钱江亚润家居用品有限公司 一种高频焊管定型检验装置

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Publication number Publication date
EP1401595A1 (fr) 2004-03-31
US20040257589A1 (en) 2004-12-23
ATE304416T1 (de) 2005-09-15
DE50204272D1 (de) 2005-10-20
WO2003002280A8 (fr) 2003-06-19
DE10130937C1 (de) 2003-01-30
WO2003002280A1 (fr) 2003-01-09
US7489412B2 (en) 2009-02-10

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