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EP3028785B1 - Procede de cintrage de pieces tubulaires attachés à une bride et dispositif de cintrage destine a la realisation d'un tel procede - Google Patents

Procede de cintrage de pieces tubulaires attachés à une bride et dispositif de cintrage destine a la realisation d'un tel procede Download PDF

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Publication number
EP3028785B1
EP3028785B1 EP15191988.3A EP15191988A EP3028785B1 EP 3028785 B1 EP3028785 B1 EP 3028785B1 EP 15191988 A EP15191988 A EP 15191988A EP 3028785 B1 EP3028785 B1 EP 3028785B1
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EP
European Patent Office
Prior art keywords
workpiece
collet
bending
flange
chuck
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.)
Active
Application number
EP15191988.3A
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German (de)
English (en)
Other versions
EP3028785A1 (fr
Inventor
Frank Hacker
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.)
Wafios AG
Original Assignee
Wafios AG
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Publication date
Application filed by Wafios AG filed Critical Wafios AG
Publication of EP3028785A1 publication Critical patent/EP3028785A1/fr
Application granted granted Critical
Publication of EP3028785B1 publication Critical patent/EP3028785B1/fr
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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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/12—Bending rods, profiles, or tubes with programme control
    • 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
    • B21D7/022—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment over a stationary forming member only

Definitions

  • the invention relates to a method for bending tubular workpieces, wherein in each case a workpiece which is fastened to a flange, stretched by the chuck of a rotatable collet and bent by means of a movable bending head, wherein the movements of the collet and the bending head of a central Control be controlled.
  • the invention further relates to a device for bending tubular workpieces according to such a method, comprising a machine frame, a relative thereto movable clamping device with a rotatable collet chuck for receiving a chuck for clamping a tubular workpiece, which is provided with a flange, further with a movable relative to a clamped workpiece bending head, and with a control device for controlling the movements of the clamping device and the bending head for performing desired bending operations on the tubular workpiece.
  • the invention aims to provide a method for bending tubular workpieces available, in spite of the eccentric arrangement of the tube on the flange latter can be clamped concentrically to the collet and even in the presence of different eccentricities the need to use each specific matched collets is avoided.
  • the flange is arranged concentrically in the chuck and thus concentrically in the collet, wherein the central axis of the tubular workpiece is arranged after clamping eccentrically to the axis of rotation of the clamping device.
  • the collet must be carried out for this without encroachment and even with different eccentricities eliminates the need to use each eccentricity specially adapted collet.
  • the interference circuit of the collet always remains the same, namely relatively small, and it can be easily made corrections to the arrangement with respect to the eccentricity.
  • the occurring due to the eccentric arrangement of the tubular workpiece on the flange during a rotation of the collet horizontal and vertical changes in the position of the central axis of the workpiece are continuously determined upon execution of a rotary movement of the collet from the central control and their sizes and directions according to the vertical and horizontal positions the bending head and / or the collet continuously adjusted.
  • the caused by the eccentricity of the tubular workpiece at its flange and its centric clamping in the collet at a rotation of the latter positional change of the tubular workpiece via the central control is compensated by the also required to compensate for the change in position of the tubular workpiece changes in the Positions of the bending head and / or the collet be made so that the relative position of the bending head and workpiece to each other in carrying out this triggered by the central control adjustment (s) is always maintained.
  • the necessary adjustments to compensate for the eccentricity in rotation of the collet via the central control can be carried out in different ways: on the one hand there is the possibility that only the bending head is rotated in rotation of the collet in its position by the upon rotation of the collet occurring horizontal and vertical offset of the central axis of the tubular body relative to the position at the beginning of the rotation is continuously compensated by a respective equal and equal horizontal and vertical compensation movement of the bending head.
  • the required positional compensation of the bending head and workpiece can also be carried out by means of the central control by rotating the collet by simultaneous compensation movements of both the bending head and the collet (or the clamping device).
  • the distribution of the required compensation movements to those for the bending head and those for the collet via the central control is carried out according to a predetermined and stored in this division rule.
  • the inventive method is applicable to both tubular, as well as rod-shaped workpieces, wherein the term "flange”, which is used in the description of the invention, not only a flange, but also another component which on a tubular or rod-shaped Workpiece is attached, with should include.
  • the chuck is clamped to the collet so that the central axis of the recorded workpiece is in a predetermined angular position relative to the collet so that when clamping so far always the same output angular position of the workpiece is fixed in the clamping device, which facilitates the detection of the parameters required for the determination of the compensatory movements in the central control for the position of the central axis of the tubular workpiece.
  • the determination of the horizontal and vertical changes in the position of the central axis of the workpiece in the central control can be made on the basis of different parameters describing the position of the central axis of the workpiece upon rotation of the chuck, wherein the clamping device of the bending machine corresponding detection means for respective detection of these parameters are assigned, whose signals are routed continuously to the central control.
  • a particularly advantageous embodiment of the method according to the invention is, however, the horizontal and vertical changes in the position of the central axis of the workpiece on the one hand from the size of the eccentricity between the central axis of the workpiece and the axis of rotation of the chuck, which can be entered as a predetermined value in the central control , as well as from the rotation angle of the rotation of the collet determined and according to the bending head and / or the collet is moved horizontally and vertically / are.
  • the invention also aims to propose a bending device for tubular workpieces, which is particularly suitable for carrying out the above-described method according to the invention.
  • a bending device for tubular workpieces with a machine frame, a relative thereto movable clamping device with a rotatable collet chuck for receiving a chuck for clamping a tubular workpiece, which is mounted on a flange, further with a relative to a clamped workpiece movable bending head, and with a central control for controlling the movements of the clamping device and the bending head to perform desired bending operations on the tubular workpiece, characterized in that the flange concentrically clamped on the chuck, while the central axis of the workpiece by a predetermined distance from the axis of rotation of the collet eccentric Furthermore, and wherein the control device for the central control is adapted to the occurring at each rotation of the collet horizontal and vertical changes in the position of the Center axis of
  • the flange to be clamped in the clamping device, to which the workpiece is fastened may be formed in a wide variety of forms, but preferably has a substantially circular shape or an elliptical or oval shape.
  • the flange is attached to an end portion of the tubular workpiece.
  • An advantageous embodiment of the bending device according to the invention also consists in that the collet, the chuck and the flange are each provided with a mark or an indexing for aligning the position of the central axis of the workpiece to be clamped relative to the collet during clamping, thereby ensuring that after completed clamping the flange-mounted workpiece in an always the same, predetermined angular position (as the starting position) is arranged relative to the collet.
  • Fig. 1 shows in a perspective oblique view a bending device 1, as it can be used to carry out a bending process according to the invention.
  • Fig. 1 is only to show in principle the structure of a bending device 1 according to the invention, wherein the representation of conventional components whose use in such bending devices is known to the expert, but which are not necessary in view of the understanding of the invention has been omitted.
  • the bending device 1 basically comprises a machine frame 2, to which a clamping device 3 for clamping workpieces 7 to be machined is attached at the top.
  • the clamping device 3 is in the example shown in the longitudinal direction of the machine frame 2 movable, which should be indicated by the arrows A only in principle.
  • the sliding movement of the clamping device 3 z. B. along (usually) two parallel linear guides, which are mounted on top of the machine frame 2.
  • the clamping device 3 in this case comprises a collet 4 with a chuck 5, at its axial, a bending head 10 facing front flange 6 is clamped centrally to the chuck 5 and thus to collet 4, to which a tubular workpiece 7 is attached.
  • a bending head 10 facing front flange 6 is clamped centrally to the chuck 5 and thus to collet 4, to which a tubular workpiece 7 is attached.
  • the tubular workpiece 7 is attached to the flange 6, which in turn has a substantially circular shape, in a eccentric to this eccentric position.
  • the collet 4 is in turn connected to a drive 8, via which it can be driven to pivot in both directions of rotation, which is indicated by the arrow Y.
  • the drive 8 is in turn attached to a movable carriage 9, via which the clamping device 3 in the longitudinal direction of the machine frame 2, namely in the two directions of arrow A , is movable.
  • a bending head 10 On the front side of the machine frame 2, a bending head 10 is mounted, which comprises a rotatable bending mold 11 with a concentric to the axis of rotation pivotable bending arm 12 and an upstream in the feed direction of the workpiece 7 of the bending mold 11 slide rail 14, which on the bending mold 11 opposite longitudinal side of Workpiece 7 during bending against this can be applied.
  • a clamping jaw provided with clamping jaws 13 is mounted so that it in the longitudinal direction of the bending arm 12 radially to the bending mold 11 out (and this back) can be moved.
  • Zustell-, and rotational movements of the individual parts of the bending head 10 are each suitable drives (in Fig. 1 not shown), as they are commonly used in such bending devices 1 for this purpose and as they are well known to those skilled in the art.
  • the bending head 10 is seated in a suitable manner on a support plate 15 which is provided with vertically extending, parallel linear guides 16, along which the bending head 10 vertically relative to the support plate 15 in the direction of arrow B via a suitable (in Fig. 1 not shown) drive can be moved.
  • the support plate 15 is in turn attached to a second support plate 17 which has horizontally and transversely to the feed direction of the workpiece 7 extending linear guides 18, along which the holding plate 15 can be moved in the direction of arrow C relative to the machine frame 2.
  • the second support plate 17 is rigidly attached to the front side of the machine frame 2.
  • the arrangement shown makes it possible to move the bending head 10 both vertically and horizontally with respect to the machine frame 2 and with respect to the longitudinal axis of the workpiece 7 in a perpendicular to the latter transverse plane.
  • the clamping device 3 on the machine frame 2 only in the longitudinal direction (arrows A ) movable.
  • the clamping device 3 could also be mounted on the machine frame 2 so that they can be moved in addition to their longitudinal displaceability in the direction of arrow A also perpendicular thereto in the horizontal direction according to the arrows D and also in the perpendicular thereto extending vertical is adjustable, like this in Fig. 1 is indicated by the arrows E drawn there.
  • FIG. 2 is a perspective view of a portion of the tensioning device 3 of the bending device 1 of Fig. 1 (seen from the front) with a clamped circular flange 6 and an eccentrically mounted on this workpiece 7, wherein in Fig. 2 the representation of the movable carriage 9 is omitted.
  • Fig. 2 shown section of the clamping device 3 illustrates how the circular flange 6 is concentrically clamped on the chuck 5 of the collet 4 and eccentrically carries the workpiece 7.
  • the housing of the drive 8 is provided with a radially projecting protruding mounting flange 19, the z. B. screws, on the facing front of the movable carriage 8 can be fastened.
  • Fig. 3 represents in a very basic way, a view from the front of the collet 4 with it recorded chuck 5 and this clamped circular flange 6, on which a workpiece 7 is fixed, is shown, wherein Fig. 3 No further constructional details are shown, since they only in quite a fundamental way the structural assignments when clamping a workpiece 7, which sits eccentrically on a circular flange 6 is to show. Accordingly, the clamping and fastening devices, which serve to clamp or attach constructive parts together and are known to those skilled in such clamping devices, not shown.
  • the longitudinal center axis m of the workpiece 7 is on the flange 6 in the position shown the same relative to the chuck 5 by an angle ⁇ to the in Fig. 3
  • Vertically drawn diameter axis d offset, as in Fig. 3 is shown in detail, in which respect the drawing is expressly referred to here.
  • markings 22 or indexings are mounted on the collet chuck 4, the chuck 5 and the flange 6 in order to always set a same starting position of the workpiece 7 relative to the collet chuck 4 and the chuck 5 during clamping.
  • the collet 4 is rotated clockwise by an angle ⁇ , ie in the direction of the arrow F in Fig. 3 , Also finds a corresponding rotation of the chuck 5 and of this stretched flange 6 to the center axes M instead.
  • a bending head 10 which is in operative engagement with the workpiece 7 in a previous bending operation, for example, and is located in a certain relative position relative to this workpiece 7 before the start of the rotation of the collet chuck 4, must in turn likewise be offset by the vertical displacement V H and the vertical displacement V V are moved accordingly in its position, while maintaining its relative position to the workpiece 7 during the twisting movement of the collet 4 continuously changing its own position such that the displacements of the workpiece 7 are also continuously compensated.
  • This is quite fundamentally in the representation of Fig. 4 shown for the beginning and the end position of the twisting movement.
  • the workpiece 7 is indeed in a same relative position to the bending head 10 as at the beginning of rotation, which is always understood here by "same relative position" that the relative horizontal and vertical assignment of the bending head to the workpiece 7 remains unchanged.
  • a suitable device for continuously detecting the angle of rotation ⁇ is attached to the clamping device 3, such as an incremental rotation angle sensor, such as such
  • the rotatable clamping device 3 must therefore already be provided in order to carry out a predetermined rotation caused by the central control device 30 as part of a bending program.
  • the size of the rotation angle ⁇ is detected by such a (not shown in the figures) rotation angle sensor continuously and delivered a corresponding signal to the central control device 30.
  • the eccentricity e is stored by, for example, manual input, wherein the control device 30 from the currently supplied detection signals on the instantaneous angular position of the rotational movement of these signals for the current rotational position of the collet 4 valid values for the horizontal and vertical offset V H.
  • V V determines and corresponding control signals to adjusting motors for the vertical and horizontal displacement movement of the bending head 10 (in the example shown in the figures) or (not shown in the figures) to corresponding motors for a vertical and a horizontal adjustment of the position of the clamping device. 3 relative to the bending head 10 or else (also not shown in the figures) to forward such adjusting both for the clamping device 3, as well as for the bending head 10, in the latter case, the horizontal and vertical position of both the clamping device 3 as well as the bending head s 10 according to a provided and stored in this case in the central control device 30 default for dividing the determined horizontal and vertical adjustment movement to corresponding, superimposed horizontal and vertical adjustment movements of the clamping device 3 and the bending head 10 is made.

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

Claims (7)

  1. Procédé de cintrage de pièces (7) tubulaires, dans lequel respectivement une pièce (7) qui est attachée à une bride (6) est serrée par le mandrin (5) d'une pince de serrage (4) rotative et cintrée au moyen d'une tête de cintrage (10) déplaçable en fonction d'une séquence de cintrage prédéfinie, les mouvements de la pince de serrage (4) et de la tête de cintrage (10) étant commandés par une commande (30) centrale, caractérisé par les étapes de procédé suivantes :
    a) la bride (6) de la pièce (7) est serrée de façon concentrique sur le mandrin (5), l'axe central (m) de la pièce (7) étant décalé d'une distance (e) par rapport à l'axe de rotation (M) de la pince de serrage (4) ;
    b) les variations (VH, VV) horizontales et verticales de l'emplacement de l'axe central (m) de la pièce qui apparaissent lors de chaque rotation de la pince de serrage (4) sont définies en permanence par la commande (30) centrale ;
    c) en fonction de ces variations (VH, VV) horizontales et verticales, lors de chaque rotation de la pince de serrage (4), la commande (30) centrale règle les positions de la tête de cintrage (10) et/ou de la pince de serrage (4) en permanence verticalement et horizontalement de sorte que l'emplacement relatif de la tête de cintrage (10) et de la pièce (7) l'une par rapport à l'autre demeure constamment conservé de façon inchangée.
  2. Procédé selon la revendication 1, caractérisé en ce que la bride (6) est serrée sur le mandrin (5) de telle sorte que l'axe central (m) de la pièce (7) est dans une position prédéfinie par rapport à la pince de serrage (4).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les variations (VH, Vv) horizontales et verticales de l'axe central (m) de la pièce (7) sont définies dans la commande (30) centrale à partir de la valeur de la distance (e) entre l'axe central (m) de la pièce (7) et l'axe de rotation (M) du mandrin (5) ainsi qu'à partir de l'angle de rotation (α) de la pince de serrage (4), et la tête de cintrage (10) et/ou la pince de serrage (4) est/sont déplacée(s) horizontalement et verticalement en conséquence.
  4. Dispositif de cintrage (1) pour pièces (7) tubulaires, en particulier pour la réalisation d'un procédé selon la revendication 1, avec un bâti de machine (2), un système de serrage (3), déplaçable par rapport à celui-ci, avec une pince de serrage (4) rotative pour la réception d'un mandrin (5) destiné au serrage d'une pièce (7) tubulaire qui est dotée d'une bride, également avec une tête de cintrage (10) déplaçable par rapport à une pièce (7) serrée, et avec un système de commande (30) pour la commande des mouvements du système de serrage (3) et de la tête de cintrage (10) pour la réalisation de processus de cintrage souhaités sur la pièce (7) tubulaire, caractérisé en ce que la bride (6) peut être serrée de façon concentrique sur la pince de serrage (4) et ce faisant l'axe central (m) de la pièce (7) est décalé de façon excentrée d'une distance e) prédéfinie par rapport à l'axe de rotation (M) de la pince de serrage (4), et le système de commande (30) étant aménagé pour définir en permanence des variations (VH, Vv) horizontales et verticales de la position de l'axe central (m) de la pièce (7) serrée qui apparaissent lors de chaque rotation de la pince de serrage (4) et pour, en fonction de cela, déplacer en permanence respectivement verticalement et horizontalement les emplacements de la tête de cintrage (10) et/ou de la pièce (7) de telle sorte que l'emplacement de la tête de cintrage (10) par rapport à l'axe central (m) de la pièce (7) demeure constamment conservé de façon inchangée.
  5. Dispositif de cintrage selon la revendication 4, caractérisé en ce que la bride (6) présente une forme essentiellement circulaire, elliptique ou ovale.
  6. Dispositif de cintrage selon la revendication 4 ou 5, caractérisé en ce que la bride (6) est mise en place à une extrémité de la pièce (7) tubulaire.
  7. Dispositif de cintrage selon l'une des revendications 4 à 6, caractérisé en ce que la pince de serrage (4), le mandrin (5) et la bride (6) sont dotés de repères (22) pour l'orientation de la position de l'axe central (m) de la pièce (7) par rapport à la pince de serrage (4) lors du processus de serrage.
EP15191988.3A 2014-12-01 2015-10-28 Procede de cintrage de pieces tubulaires attachés à une bride et dispositif de cintrage destine a la realisation d'un tel procede Active EP3028785B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014117623.5A DE102014117623B4 (de) 2014-12-01 2014-12-01 Verfahren zum Biegen rohrförmiger Werkstücke sowie Biegevorrichtung zur Durchführung eines solchen Verfahrens

Publications (2)

Publication Number Publication Date
EP3028785A1 EP3028785A1 (fr) 2016-06-08
EP3028785B1 true EP3028785B1 (fr) 2017-02-22

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EP15191988.3A Active EP3028785B1 (fr) 2014-12-01 2015-10-28 Procede de cintrage de pieces tubulaires attachés à une bride et dispositif de cintrage destine a la realisation d'un tel procede

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EP (1) EP3028785B1 (fr)
DE (1) DE102014117623B4 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL443620A1 (pl) * 2023-01-28 2024-07-29 Jb Stal Serwis Spółka Z Ograniczoną Odpowiedzialnością Sposób prostowania wyrobów metalowych
PL444851A1 (pl) * 2023-05-10 2024-06-03 Serwistal Spółka Z Ograniczoną Odpowiedzialnością Sposób i urządzenie do prostowania blach
CN118321404B (zh) * 2024-05-15 2025-09-23 中船黄埔文冲船舶有限公司 一种卡爪及弯管机

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2359949T3 (pl) * 2009-07-14 2014-03-31 Nippon Steel & Sumitomo Metal Corp Urządzenie i sposób dla wytwarzania wygiętego elementu
DE102011014953B4 (de) * 2011-03-24 2014-05-15 Wafios Ag Biegevorrichtung für stab- und rohrförmige Werkstücke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Publication number Publication date
DE102014117623A1 (de) 2016-06-02
EP3028785A1 (fr) 2016-06-08
DE102014117623B4 (de) 2016-10-20

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