EP2828015A1 - Bending machine having a bending head that is movable about a stationary bending shank - Google Patents

Bending machine having a bending head that is movable about a stationary bending shank

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Publication number
EP2828015A1
EP2828015A1 EP13715310.2A EP13715310A EP2828015A1 EP 2828015 A1 EP2828015 A1 EP 2828015A1 EP 13715310 A EP13715310 A EP 13715310A EP 2828015 A1 EP2828015 A1 EP 2828015A1
Authority
EP
European Patent Office
Prior art keywords
axis
folding
bending
head
finger
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.)
Granted
Application number
EP13715310.2A
Other languages
German (de)
French (fr)
Other versions
EP2828015B1 (en
Inventor
Julien COSTET
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.)
Numalliance SAS
Original Assignee
Numalliance SAS
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 Numalliance SAS filed Critical Numalliance SAS
Publication of EP2828015A1 publication Critical patent/EP2828015A1/en
Application granted granted Critical
Publication of EP2828015B1 publication Critical patent/EP2828015B1/en
Active 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/04—Bending rods, profiles, or tubes over a movably-arranged forming menber
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • B21D11/12—Bending specially adapted to produce specific articles, e.g. leaf springs the articles being reinforcements for concrete

Definitions

  • the invention relates to a machine for bending, forming, folding or bending a bar along a bending axis, machine comprising:
  • a folding head comprising a folding finger rotatable with respect to the axis of folding
  • a feeding station located upstream of the nose of folding to move a bar along a scroll axis and through the nose of folding.
  • Such a machine is in particular known from document FR 2 806 943 which describes a machine in which the folding head is movable in translation along an axis perpendicular to the axis of movement of the bar, the folding nose carried by the arm, is movable in translation along the axis of travel relative to the frame and thus relative to the folding head.
  • This machine allows a large number of shapes, including loops, and shapes of various diameters.
  • the rigidity of the bending nose is altered by the fact that the nose is carried by a movable support and the mechanical play inherent in guiding the telescopic nose.
  • the disposition of the movable nose imposes, in the majority of the folding sequences using this disposition, to move the bar in the same proportion as the nose. It follows additional reciprocating movements to those necessitated solely by folding, and therefore a loss of precision in the axial positioning of the bar.
  • the axial displacement nose requires the use of a telescopic bar-guide tube having limited guiding qualities.
  • the invention proposes a new machine, not having the disadvantages of a machine as described above. More specifically, the invention proposes a machine for bending, forming, folding or bending a bar along a bending axis, machine comprising:
  • a folding head comprising a folding finger rotatable with respect to the axis of folding
  • a feeding station located upstream of the nose of folding to move the bar along a running axis and through the nose of folding.
  • a first connecting rod carrying the folding finger A second connecting rod of which a head is coupled to a head of the first connecting rod in rotation relative to an axis of articulation perpendicular to the axis of movement,
  • the folding head is driven in motion by the combination of two connecting rods whose foot is driven in translation along an axis parallel to the axis of travel of the wire.
  • An appropriate control of the drive means in translation of the foot of the connecting rods allows the folding finger to move relative to the frame and the folding nose, in translation along the axis of travel (for example horizontal) and / or in translation. along an axis (eg vertical) perpendicular to the scroll axis as will be seen later. It is thus possible to produce at least the same shapes as with a machine according to the prior art described above.
  • an appropriate control of the drive means in translation of the foot of the connecting rods also allows movements of the folding finger along other paths in a fold plane passing through the axis of movement so that it is possible to perform a many forms.
  • the folding nose can be fixed relative to the arm, since the translational movement of the folding nose with respect to the folding head can be achieved by appropriate control of the translation drive means. from the foot of the connecting rods. As the displacement of the folding head is faster than a displacement of the bending nose, the speed of execution of the bends is greater. In addition, in a machine according to the invention, the mechanical clearances in particular at the level of the fixed bending nose are limited. The quality of the parts produced is thus improved.
  • the translational control of the feet of the two connecting rods is sufficient to drive the folding head (the connecting rods, the folding finger) moving. Specific control of the lateral movement of the folding head is not necessary.
  • the arm can be rotatably mounted relative to the frame along the axis of scrolling. This allows, before making a folding, to orient the nose of folding relative to the folding head.
  • the folding head may also comprise a bending roller rotatably mounted relative to its axis (ie along an axis of the roller) parallel to the axis of folding.
  • the roller makes it possible to produce specific shapes, in particular loops and bends beyond 180 °.
  • the folding finger can also be freely rotatable along its axis (ie along an axis of the folding finger) parallel to the axis of folding, which considerably limits the frictional forces of the folding finger on the bar to be folded.
  • the folding finger, and the roller if there is one are fixed on the folding head, for example on the first connecting rod, rotatable relative to the folding head.
  • the folding head comprises a tool removably mounted on the folding head; the tool comprises a support piece on which the folding finger (and the roller if there is one) is mounted; the folding head comprises means for rotating the support piece of the tool along the axis of folding.
  • the folding finger, and the roller if there is one, are mounted on a support piece, the support piece assembly, folding finger and roller forming a tool; the tool being removably mounted on the folding head, it is thus very easy to change to make folds of different shapes and / or diameters, while maintaining the same drive means of the folding head in motion.
  • the tool may comprise a fixing lug extending from a first face of the support part the tool; the folding finger and possibly the roller extend from a second face of the support piece of the tool, and the folding head further comprises:
  • a jaw adapted to receive the fixing lug and to immobilize the fixing lug in rotation and in translation
  • a means for driving the jaw in rotation along the axis of folding is provided.
  • the lug of the tool and the jaw of the folding head together form a removable attachment means of the tool on the folding head.
  • the axis of the jaw, the axis of the lug and the axis of folding are merged.
  • the jaw is for example fixed on the head of the first rod.
  • the axis of the folding finger or the axis of the bending roller may be confused with the bending axis for specific bends.
  • the lateral outer surface of the bending finger and / or the bending roller may have a surface of revolution about the axis of the bending pin or the axis of the roller.
  • bending for example a cylindrical surface, or a surface portion of tube closed on itself (cut tube shape closed on itself, a form of revolution obtained from an arc).
  • Such a surface is well adapted to allow the rotation of the folding finger or the roller on itself as the folding finger or the roller moves along the bar to be bent, which limits the friction forces .
  • the outer surface of the folding finger is locally, on a portion of said outer surface:
  • Such a surface is well adapted to marry the best forms of a bar to fold and allows the realization of folds without sliding of the folding finger or the bending roller on the bar to bend.
  • FIG. 1a is a partial diagram of a machine according to the invention, a tool taken out of its housing
  • FIG. 1b is a kinematic diagram of the elements of FIG.
  • FIG. 2a shows a tool comprising a folding finger
  • FIG. 2b shows a tool comprising a folding finger and a roller
  • FIG. 2c shows another tool comprising a folding finger and a roller
  • FIGS. 3a and 3b show the kinematics of a folding on the bending nose
  • FIGS. 4a and 4b show the kinematics of a folding on the axis of folding
  • FIGS. 6a and 6b show the kinematics of embodiment two against-folds at one time
  • Figures 7a and 7b show the kinematics of a fold without slip.
  • bar has been used to designate more generally a raw part that can be a bar, a wire, a tube or a profile before bending.
  • upstream and downstream are defined in the usual way, along the bar to be folded and in the direction of scrolling of the bar.
  • a machine according to the invention comprises:
  • a folding head 50 on which is fixed a rotary tool 70 along a folding axis
  • a feeding station located upstream of the nose of folding to move a bar along a running axis and through the nose of folding.
  • the folding head also includes:
  • a second connecting rod 90 a head 91 of which is coupled to the head 81 of the first connecting rod 80 in rotation with respect to an articulation axis A perpendicular to the running axis B and parallel to the folding axis P.
  • the folding head further comprises a first drive means 30 for driving in translation a foot 82 of the first connecting rod along an axis parallel to the running axis, and a second driving means 40 for translational driving a foot 92 the second connecting rod 90 along an axis parallel to the axis of travel.
  • the foot 82 of the first link 80 is free to rotate relative to the drive means 30 and can thus rotate freely along an axis parallel to the axis of folding.
  • the foot 92 of the second link is free to rotate relative to the drive means 40 and can thus freely rotate along an axis parallel to the fold axis.
  • the tool 70 comprises a support part 71 comprising a fixing lug 74 extending from a first face of the support part 71 of the tool.
  • the folding head 50 comprises means for driving the tool in rotation along the folding axis P. In the examples shown, this driving means comprises:
  • Means for driving the jaw in rotation along the axis of folding; the axis of folding, the axis of the jaw and the axis of the pin are combined when the tool is mounted in the jaw.
  • the axis of folding P is the axis of the folding head around which the folding finger can be rotated.
  • Different tools make it possible to make different bends or bends on bars of different diameter and shape, depending in particular on the shape and diameter of the folding finger, the presence or absence of a roller, the shape and the diameter of the roller, the position of the axis of the folding finger and / or the axis of the roller with respect to the axis of folding, etc.
  • a tool mounted on the folding head can easily be replaced by another.
  • the folding finger 72 extends from a second face of the support piece and is mounted in free rotation relative to the axis D of the folding finger, parallel to the axis P of folding.
  • the tool also comprises a bending roller extending parallel to the folding finger, from the second face of the support piece along an axis G of the roller coinciding with the folding axis P.
  • the roller is here mounted in free rotation on its axis.
  • the tool also comprises a bending roller 73 extending parallel to the folding finger 72, from the second face of the support piece along an axis G of the roller parallel to the P axis of folding.
  • the roller is here mounted in free rotation on its axis.
  • the axis of the roller G coincides with the folding axis P and the axis D of the folding finger is offset with respect to the folding axis P.
  • the axis of the roller and the axis of the folding finger are offset with respect to the axis of folding.
  • the lateral external surface of the folding finger is a surface of revolution about the axis of the folding finger, more precisely a hollow surface forming a groove in which a bar can be positioned. cylindrical to bend. The bar is thus perfectly maintained laterally and can not move in translation along the axis of folding.
  • the external surface of the folding finger is locally concave cylindrical, along an axis perpendicular to the axis of the folding finger or the axis of the bending roller, a diameter of the cylinder corresponding to the diameter a bar to bend. It is thus perfectly adapted to rest on the surface of a tube for making a fold without sliding.
  • the drive means in rotation of the finger with respect to the axis of folding and the drive means in translation of the ends 82, 92 of the connecting rods are controlled by digital control means, in other words by a control software. user-configurable control depending on the bends to be made.
  • the bending axis of the machine is a horizontal axis, perpendicular to the longitudinal axis of the bar to bend.
  • the drive means in translation of the ends 82, 92 of the connecting rods allow to accurately position the point intersection of the bending axis of the machine in the vertical plane passing through the longitudinal axis of the bar to bend. Then, the rotation of the folding finger along the axis of folding, possibly in combination with a simultaneous movement of the folding axis, allows the desired folding, as will be seen in the examples below.
  • Figures 3a, 3b show the kinematics of a folding of a cylindrical bar on the nose of folding.
  • the tool used comprises only a folding finger, the axis of which is offset with respect to the axis of folding.
  • the bar is fed through the bend nose, and is immobilized in the bend nose.
  • the folding finger 72 In the initial position (FIG 3a), the folding finger 72 is positioned under the bar, in contact with the bar.
  • the folding axis perpendicular to the axis of the bar, and passes through the axis of the bar.
  • the finger is rotated along the axis of folding, to its final position (Figure 3b).
  • the shape of the fold is here given by the shape of the folding nose.
  • Figures 4a, 4b show the kinematic embodiment of a fold on the fold axis.
  • the tool used comprises a roller whose axis coincides with the axis of folding, and a folding finger whose axis is offset with respect to the axis of folding.
  • the bar is fed through the bending nose, and protrudes downstream of the bending nose by a sufficient length to form the bend without the bending head coming into contact with the bending nose.
  • the folding axis is positioned relative to the bar so that the roller and the folding finger are in contact with the bar to be folded, one being above and the other below the bar.
  • the bending finger is rotated and slides or rolls on the end of the bending bar to the end position (Fig. 4b).
  • the folding head being sufficiently far away from the folding nose, the folding can go in the example shown until the realization of a closed loop.
  • Figures 5a to 5c show the kinematic embodiment of several successive folds at 90 ° along a cylindrical bar.
  • the tool used is the same as in the example of Figures 4a, 4b.
  • the first fold closest to the bending nose along the bar
  • the second fold downstream of the first has just been completed.
  • the roller is positioned inside the second fold
  • the folding finger is positioned outside the second fold, downstream of the roller.
  • the fold axis is first shifted in translation along an axis parallel to the axis of the bar in the bending nose to the position where the bending is to be made (FIG. ), then the finger is rotated to make the folding (Fig 5c).
  • a flat piece with a rectangular section has been made.
  • Figures 6a, 6b show the kinematics of simultaneous realization of two against-folds, one on the nose of folding, the other around the roller.
  • the tool used is the same as in the example of Figures 4a, 4b.
  • the folding axis and the folding finger are positioned so that the finger and the roller are positioned on either side of the bar to be folded and in contact with the bar.
  • the fold is then made by moving the folding head (and therefore the folding axis) along a curved path to its final position (FIG 6b), the folding finger being held stationary relative to the axis of folding. folding. Note that here only the folding axis is moved during the folding phase.
  • Figures 7a, 7b show the kinematic embodiment of a fold without sliding of a cylindrical bar on the bending nose of the machine.
  • the tool used here comprises a folding finger whose axis is offset with respect to the axis of folding.
  • the roller is in this example useless.
  • the fold In the initial position (Fig. 7a), the fold must be under the bar so that the line perpendicular to the fold axis and passing through the axis of the finger is perpendicular to the bar to bend.
  • the fold is then made by moving in rotation the folding head and the folding axis, the finger being held stationary relative to the folding axis (FIG 7b).
  • the fold is here produced without slippage, that is to say that the point of contact between the bar and the straight line perpendicular to the axis of folding and passing through the axis of the finger is the same throughout the folding phase .
  • the folding finger is immobile, and in particular does not rotate on itself, as may be the case in the previous examples.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

The invention relates to a machine for cambering, shaping, bending or curving a bar (100) along a bending axis (P), said machine comprising: an arm (10), a bending shank (20) supported by the arm, a bending head (50) including a bending lug (72) that is rotatable relative to the bending axis; and a feeding station located upstream from the bending shank for moving the bar along an axis of travel and across the bending shank. The machine according to the invention is characterised in that the bending head also includes: a first connecting rod (80) supporting the bending lug, a second connecting rod (90), a head (91) of which is coupled to a head (81) of the first connecting rod so as to rotate relative to a hinge axis (A) perpendicular to the axis of travel (B), a first drive means (30) for translating a leg (82) of the first connecting rod (80) along an axis parallel to the axis of travel, and a second drive means (40) for translating a leg (92) of the second connecting rod (90) along an axis parallel to the axis of travel. The invention can be used for cambering, shaping, bending, or curving a bar, a wire, a tube, a profile member, etc.

Description

Machine de cintrage à tête de pliage mobile autour d'un nez de pliage fixe Bending machine with folding head movable around a fixed bending nose
Domaine technique et état de l'art Technical field and state of the art
L'invention concerne une machine pour le cambrage, le formage, le pliage ou le cintrage d'une barre selon un axe de pliage, machine comportant : The invention relates to a machine for bending, forming, folding or bending a bar along a bending axis, machine comprising:
• un bras,  • an arm,
• un nez de pliage porté par le bras,  • a folding nose carried by the arm,
• une tête de pliage comprenant un doigt de pliage rotatif par rapport à l'axe de pliage, et  A folding head comprising a folding finger rotatable with respect to the axis of folding, and
• un poste d'amenage situé en amont du nez de pliage pour déplacer une barre selon un axe de défilement et à travers le nez de pliage.  • a feeding station located upstream of the nose of folding to move a bar along a scroll axis and through the nose of folding.
Une telle machine est notamment connue du document FR 2 806 943 qui décrit une machine dans laquelle la tête de pliage est mobile en translation selon un axe perpendiculaire à l'axe de défilement de la barre, le nez de pliage, porté par le bras, est mobile en translation selon l'axe de défilement par rapport au bâti et donc par rapport à la tête de pliage. Cette machine permet de réaliser un grand nombre de formes, notamment des boucles, et des formes de diamètres variés. Cependant, la rigidité du nez de pliage est altérée, par le fait que le nez est porté par un support mobile et par les jeux mécaniques inhérents au guidage du nez télescopique. Such a machine is in particular known from document FR 2 806 943 which describes a machine in which the folding head is movable in translation along an axis perpendicular to the axis of movement of the bar, the folding nose carried by the arm, is movable in translation along the axis of travel relative to the frame and thus relative to the folding head. This machine allows a large number of shapes, including loops, and shapes of various diameters. However, the rigidity of the bending nose is altered by the fact that the nose is carried by a movable support and the mechanical play inherent in guiding the telescopic nose.
De plus la disposition du nez mobile impose, dans la majorité des séquences de pliage utilisant cette disposition, de déplacer la barre dans la même proportion que le nez. Il s'ensuit des mouvements alternatifs supplémentaires à ceux nécessités uniquement par le pliage, et donc une perte de précision dans le positionnement axial de la barre. In addition, the disposition of the movable nose imposes, in the majority of the folding sequences using this disposition, to move the bar in the same proportion as the nose. It follows additional reciprocating movements to those necessitated solely by folding, and therefore a loss of precision in the axial positioning of the bar.
D'autre part, le nez à déplacement axial impose de recourir à un tube-guide-barre télescopique, présentant des qualités de guidage limitées. On the other hand, the axial displacement nose requires the use of a telescopic bar-guide tube having limited guiding qualities.
Description de l'invention Description of the invention
L'invention propose une nouvelle machine, ne présentant pas les inconvénients d'une machine telle que décrite ci- dessus. Plus précisément, l'invention propose une machine pour le cambrage, le formage, le pliage ou le cintrage d'une barre selon un axe de pliage, machine comportant : The invention proposes a new machine, not having the disadvantages of a machine as described above. More specifically, the invention proposes a machine for bending, forming, folding or bending a bar along a bending axis, machine comprising:
• un bras,  • an arm,
• un nez de pliage porté par le bras,  • a folding nose carried by the arm,
• une tête de pliage comprenant un doigt de pliage rotatif par rapport à l'axe de pliage,  A folding head comprising a folding finger rotatable with respect to the axis of folding,
• un poste d'amenage situé en amont du nez de pliage pour déplacer la barre selon un axe de défilement et à travers le nez de pliage.  • a feeding station located upstream of the nose of folding to move the bar along a running axis and through the nose of folding.
La machine selon l'invention est par ailleurs caractérisée en ce que la tête de pliage comprend également : The machine according to the invention is further characterized in that the folding head also comprises:
• une première bielle portant le doigt de pliage, • une deuxième bielle dont une tête est couplée à une tête de la première bielle en rotation par rapport à un axe d'articulation perpendiculaire à l'axe de défilement, A first connecting rod carrying the folding finger, A second connecting rod of which a head is coupled to a head of the first connecting rod in rotation relative to an axis of articulation perpendicular to the axis of movement,
• un premier moyen d'entraînement pour entraîner en translation un pied de la première bielle selon un axe parallèle à l'axe de défilement, et un deuxième moyen d'entraînement pour entraîner en translation un pied de la deuxième bielle selon un axe parallèle à l'axe de défilement.  A first drive means for driving in translation a foot of the first connecting rod along an axis parallel to the running axis, and a second driving means for driving in translation a foot of the second connecting rod along an axis parallel to the scroll axis.
Ainsi, dans une machine selon l'invention, la tête de pliage est entraînée en mouvement par la combinaison de deux bielles dont le pied est entraîné en translation selon un axe parallèle à l'axe de défilement du fil. Une commande appropriée des moyens d'entraînement en translation du pied des bielles permet un déplacement du doigt de pliage par rapport au bâti et au nez de pliage, en translation selon l'axe de défilement (par ex. horizontal) et / ou en translation selon un axe (par ex. vertical) perpendiculaire à l'axe de défilement comme on le verra mieux plus loin. Il est ainsi possible de réaliser au moins les mêmes formes qu'avec une machine selon l'art antérieur décrit ci-dessus. Mais une commande appropriée des moyens d'entraînement en translation du pied des bielles permet également des déplacements du doigt de pliage selon d'autres trajectoires dans un plan de pliage passant par l'axe de défilement de sorte qu'il est possible de réaliser un grand nombre de formes. Thus, in a machine according to the invention, the folding head is driven in motion by the combination of two connecting rods whose foot is driven in translation along an axis parallel to the axis of travel of the wire. An appropriate control of the drive means in translation of the foot of the connecting rods allows the folding finger to move relative to the frame and the folding nose, in translation along the axis of travel (for example horizontal) and / or in translation. along an axis (eg vertical) perpendicular to the scroll axis as will be seen later. It is thus possible to produce at least the same shapes as with a machine according to the prior art described above. But an appropriate control of the drive means in translation of the foot of the connecting rods also allows movements of the folding finger along other paths in a fold plane passing through the axis of movement so that it is possible to perform a many forms.
Dans une machine selon l'invention, le nez de pliage peut être fixe par rapport au bras, car le mouvement de translation du nez de pliage par rapport à la tête de pliage peut être réalisé par une commande appropriée des moyens d'entraînement en translation du pied des bielles. Le déplacement de la tête de pliage étant plus rapide qu'un déplacement du nez de pliage, la vitesse d'exécution des pliages est plus grande. De plus, dans une machine selon l'invention, les jeux mécaniques notamment au niveau du nez de pliage fixe sont limités. La qualité des pièces réalisées est ainsi améliorée. In a machine according to the invention, the folding nose can be fixed relative to the arm, since the translational movement of the folding nose with respect to the folding head can be achieved by appropriate control of the translation drive means. from the foot of the connecting rods. As the displacement of the folding head is faster than a displacement of the bending nose, the speed of execution of the bends is greater. In addition, in a machine according to the invention, the mechanical clearances in particular at the level of the fixed bending nose are limited. The quality of the parts produced is thus improved.
Les têtes des deux bielles étant connectées entre elles, et le doigt de pliage étant porté par l'une des bielles, la commande en translation des pieds des deux bielles est suffisante pour entraîner la tête de pliage (les bielles, le doigt de pliage) en mouvement. Une commande spécifique du mouvement latéral de la tête de pliage n'est pas nécessaire. The heads of the two connecting rods being connected together, and the folding finger being carried by one of the connecting rods, the translational control of the feet of the two connecting rods is sufficient to drive the folding head (the connecting rods, the folding finger) moving. Specific control of the lateral movement of the folding head is not necessary.
Le bras peut être monté rotatif par rapport au bâti selon l'axe de défilement. Ceci permet, avant de réaliser un pliage, d'orienter le nez de pliage par rapport à la tête de pliage. The arm can be rotatably mounted relative to the frame along the axis of scrolling. This allows, before making a folding, to orient the nose of folding relative to the folding head.
La tête de pliage peut encore comprendre un galet de cintrage monté rotatif par rapport à son axe (ie selon un axe du galet) parallèle à l'axe de pliage. Le galet permet de réaliser des formes spécifiques, notamment des boucles et des pliages au delà de 180°. The folding head may also comprise a bending roller rotatably mounted relative to its axis (ie along an axis of the roller) parallel to the axis of folding. The roller makes it possible to produce specific shapes, in particular loops and bends beyond 180 °.
Le doigt de pliage peut également être en rotation libre selon son axe (ie selon un axe du doigt de pliage) parallèle à l'axe de pliage, ce qui limite considérablement les efforts de frottement du doigt de pliage sur la barre à plier. The folding finger can also be freely rotatable along its axis (ie along an axis of the folding finger) parallel to the axis of folding, which considerably limits the frictional forces of the folding finger on the bar to be folded.
Selon une variante, le doigt de pliage, et le galet s'il y en a un, sont fixés sur la tête de pliage, par exemple sur la première bielle, rotatifs par rapport à la tête de pliage. Selon une autre variante, la tête de pliage comprend un outil monté de manière amovible sur la tête de pliage ; l'outil comprend une pièce support sur laquelle le doigt de pliage (et le galet s'il y en a un), est monté ; la tête de pliage comprend un moyen pour entraîner en rotation la pièce support de l'outil selon l'axe de pliage. Dit autrement, le doigt de pliage, et le galet s'il y en a un, sont montés sur une pièce support, l'ensemble pièce support, doigt de pliage et galet formant un outil ; l'outil étant monté de manière amovible sur la tête de pliage, il est ainsi très facile d'en changer pour réaliser des pliages de formes et / ou de diamètres différents, tout en conservant les mêmes moyens d'entraînement de la tête de pliage en mouvement. According to a variant, the folding finger, and the roller if there is one, are fixed on the folding head, for example on the first connecting rod, rotatable relative to the folding head. According to another variant, the folding head comprises a tool removably mounted on the folding head; the tool comprises a support piece on which the folding finger (and the roller if there is one) is mounted; the folding head comprises means for rotating the support piece of the tool along the axis of folding. In other words, the folding finger, and the roller if there is one, are mounted on a support piece, the support piece assembly, folding finger and roller forming a tool; the tool being removably mounted on the folding head, it is thus very easy to change to make folds of different shapes and / or diameters, while maintaining the same drive means of the folding head in motion.
Dans un mode de réalisation, l'outil peut comprendre un ergot de fixation s'étendant depuis une première face de la pièce support l'outil ; le doigt de pliage et éventuellement le galet s'étendent depuis une deuxième face de la pièce support de l'outil, et la tête de pliage comprend en complément : In one embodiment, the tool may comprise a fixing lug extending from a first face of the support part the tool; the folding finger and possibly the roller extend from a second face of the support piece of the tool, and the folding head further comprises:
• un mors adapté à recevoir l'ergot de fixation et à immobiliser l'ergot de fixation en rotation et en translation, et  A jaw adapted to receive the fixing lug and to immobilize the fixing lug in rotation and in translation, and
• un moyen pour entraîner le mors en rotation selon l'axe de pliage.  A means for driving the jaw in rotation along the axis of folding.
L'ergot de l'outil et le mors de la tête de pliage forme ensemble un moyen de fixation amovible de l'outil sur la tête de pliage. Lorsque l'outil est monté sur la tête de pliage, l'axe du mors, l'axe de l'ergot et l'axe de pliage sont confondus. Le mors est par exemple fixé sur la tête de la première bielle. The lug of the tool and the jaw of the folding head together form a removable attachment means of the tool on the folding head. When the tool is mounted on the folding head, the axis of the jaw, the axis of the lug and the axis of folding are merged. The jaw is for example fixed on the head of the first rod.
L'axe du doigt de pliage ou l'axe du galet de cintrage peut être confondu avec l'axe de pliage pour des pliages spécifiques. The axis of the folding finger or the axis of the bending roller may be confused with the bending axis for specific bends.
En fonction de la forme extérieure de la barre à plier, la surface externe latérale du doigt de pliage et / ou du galet de cintrage peut présenter une surface de révolution autour de l'axe du doigt de pliage ou de l'axe du galet de cintrage, par exemple une surface cylindrique, ou bien une surface en portion de tube fermée sur elle-même (forme de tube coupé refermé sur lui-même, forme de révolution obtenue à partir d'un arc de cercle). Une telle surface est bien adaptée pour permettre la rotation du doigt de pliage ou du galet sur lui-même au fur et à mesure du déplacement du doigt de pliage ou du galet le long de la barre à plier, ce qui limite les efforts de frottement. Depending on the outer shape of the bar to be bent, the lateral outer surface of the bending finger and / or the bending roller may have a surface of revolution about the axis of the bending pin or the axis of the roller. bending, for example a cylindrical surface, or a surface portion of tube closed on itself (cut tube shape closed on itself, a form of revolution obtained from an arc). Such a surface is well adapted to allow the rotation of the folding finger or the roller on itself as the folding finger or the roller moves along the bar to be bent, which limits the friction forces .
Selon une variante, la surface externe du doigt de pliage est localement, sur une portion de la dite surface externe :According to one variant, the outer surface of the folding finger is locally, on a portion of said outer surface:
• plane, dans un plan parallèle à l'axe du doigt de pliage ou l'axe du galet de cintrage, ou • plane, in a plane parallel to the axis of the folding finger or the axis of the bending roller, or
• cylindrique concave, selon un axe perpendiculaire à l'axe du doigt de pliage ou l'axe du galet de cintrage, un diamètre du cylindre correspondant au diamètre d'une barre à plier.  Concave cylindrical, along an axis perpendicular to the axis of the folding finger or the axis of the bending roller, a diameter of the cylinder corresponding to the diameter of a bar to bend.
Une telle surface est bien adaptée pour épouser au mieux les formes d'une barre à plier et permet la réalisation de plis sans glissement du doigt de pliage ou du galet de cintrage sur la barre à plier. Such a surface is well adapted to marry the best forms of a bar to fold and allows the realization of folds without sliding of the folding finger or the bending roller on the bar to bend.
Brève description des figures Brief description of the figures
L'invention sera mieux comprise, et d'autres caractéristiques et avantages de l'invention apparaîtront à la lumière de la description qui suit d'exemples de réalisation d'une machine de cintrage selon l'invention. Ces exemples sont donnés à titre non limitatif. La description est à lire en relation avec les dessins annexés dans lesquels : The invention will be better understood, and other features and advantages of the invention will become apparent in the light of the following description of embodiments of a bending machine according to the invention. These examples are given in a non-limiting manner. The description is to be read in conjunction with the appended drawings in which:
• la figure la est un schéma partiel d'une machine selon l'invention, outil sorti de son logement  FIG. 1a is a partial diagram of a machine according to the invention, a tool taken out of its housing
• la figure lb est un schéma cinématique des éléments de la figure la,  FIG. 1b is a kinematic diagram of the elements of FIG.
• la figure 2a montre un outil comprenant un doigt de pliage  FIG. 2a shows a tool comprising a folding finger
• la figure 2b montre un outil comprenant un doigt de pliage et un galet  FIG. 2b shows a tool comprising a folding finger and a roller
• la figure 2c montre un autre outil comprenant un doigt de pliage et un galet • les figures 3a et 3b montrent la cinématique d'un pliage sur le nez de pliage FIG. 2c shows another tool comprising a folding finger and a roller FIGS. 3a and 3b show the kinematics of a folding on the bending nose
• les figures 4a et 4b montrent la cinématique d'un pliage sur l'axe de pliage  FIGS. 4a and 4b show the kinematics of a folding on the axis of folding
• les figures 5a à 5c montrent la cinématique d'un pliage décalé (5a = position en fin du 2ème pli, 5b = position en début du 3ème pli, 5c = position en fin du 3ème pli)  FIGS. 5a to 5c show the kinematics of an offset fold (5a = position at the end of the 2nd fold, 5b = position at the beginning of the 3rd fold, 5c = position at the end of the 3rd fold).
• les figures 6a et 6b montrent la cinématique de réalisation deux contre -plis en une fois  FIGS. 6a and 6b show the kinematics of embodiment two against-folds at one time
• les figures 7a et 7b montrent la cinématique d'un pli sans glissement.  • Figures 7a and 7b show the kinematics of a fold without slip.
Pour simplifier la lecture on a utilisé, dans la description le seul terme "barre" pour désigner plus généralement une pièce brute pouvant être une barre, un fil, un tube, un profilé avant cintrage. To simplify the reading, in the description the only term "bar" has been used to designate more generally a raw part that can be a bar, a wire, a tube or a profile before bending.
Egalement pour simplifier, on a choisi de décrire les réalisations et les mouvements des éléments de la machine selon l'invention par rapport au plan horizontal des figures, correspondant au plan vertical de la machine sur pied, Les termes "haut", "bas" sont ainsi définis par rapport au plan des figures. Mais ces réalisations sont bien entendu reproductibles dans tous les plans de travail. Also to simplify, we chose to describe the achievements and movements of the elements of the machine according to the invention relative to the horizontal plane of the figures, corresponding to the vertical plane of the standing machine, The terms "high", "low" are thus defined with respect to the plane of the figures. But these achievements are of course reproducible in all plans of work.
Enfin, les termes "amont" et "aval" sont définis de manière habituelle, le long de la barre à plier et selon le sens de défilement de la barre. Finally, the terms "upstream" and "downstream" are defined in the usual way, along the bar to be folded and in the direction of scrolling of the bar.
Description d'un mode de réalisation de l'invention Description of an embodiment of the invention
Dans les exemples représentés, une machine selon l'invention comporte : In the examples shown, a machine according to the invention comprises:
• un bras 10, rotatif autour de l'axe de défilement et fixé à un bâti statique non représenté,  An arm 10, rotating around the scroll axis and fixed to a static frame, not shown,
• un nez de pliage 20 porté par le bras 10, et fixe par rapport au bras,  A folding nose 20 carried by the arm 10, and fixed with respect to the arm,
• une tête de pliage 50 sur laquelle est fixé un outil 70 rotatif selon un axe de pliage,  A folding head 50 on which is fixed a rotary tool 70 along a folding axis,
• un poste d'amenage (non représenté) situé en amont du nez de pliage pour déplacer une barre selon un axe de défilement et à travers le nez de pliage.  • a feeding station (not shown) located upstream of the nose of folding to move a bar along a running axis and through the nose of folding.
La tête de pliage comprend également : The folding head also includes:
• une première bielle 80 dont une tête 81 porte l'outil 70,  A first rod 80 having a head 81 carrying the tool 70,
• une deuxième bielle 90 dont une tête 91 est couplée à la tête 81 de la première bielle 80 en rotation par rapport à un axe d'articulation A perpendiculaire à l'axe de défilement B et parallèle à l'axe de pliage P.  A second connecting rod 90, a head 91 of which is coupled to the head 81 of the first connecting rod 80 in rotation with respect to an articulation axis A perpendicular to the running axis B and parallel to the folding axis P.
La tête de pliage comprend encore un premier moyen d'entraînement 30 pour entraîner en translation un pied 82 de la première bielle selon un axe parallèle à l'axe de défilement, et un deuxième moyen d'entraînement 40 pour entraîner en translation un pied 92 de la deuxième bielle 90 selon un axe parallèle à l'axe de défilement. Le pied 82 de la première bielle 80 est libre en rotation par rapport au moyen d'entraînement 30 et peut ainsi tourner librement selon un axe parallèle à l'axe de pliage. De manière similaire, le pied 92 de la deuxième bielle est libre en rotation par rapport au moyen d'entraînement 40 et peut ainsi tourner librement selon un axe parallèle à l'axe de pliage. The folding head further comprises a first drive means 30 for driving in translation a foot 82 of the first connecting rod along an axis parallel to the running axis, and a second driving means 40 for translational driving a foot 92 the second connecting rod 90 along an axis parallel to the axis of travel. The foot 82 of the first link 80 is free to rotate relative to the drive means 30 and can thus rotate freely along an axis parallel to the axis of folding. Similarly, the foot 92 of the second link is free to rotate relative to the drive means 40 and can thus freely rotate along an axis parallel to the fold axis.
Dans l'exemple des figures 2a, 2b, 2c notamment, l'outil 70 comprend une pièce support 71 comprenant un ergot de fixation 74 s'étendant depuis une première face de la pièce support 71 de l'outil. La tête de pliage 50 comprend un moyen pour entraîner l'outil en rotation selon l'axe de pliage P. Dans les exemples représentés, ce moyen d'entraînement comprend : In the example of Figures 2a, 2b, 2c in particular, the tool 70 comprises a support part 71 comprising a fixing lug 74 extending from a first face of the support part 71 of the tool. The folding head 50 comprises means for driving the tool in rotation along the folding axis P. In the examples shown, this driving means comprises:
• un mors 60 adapté à recevoir l'ergot de fixation 74 et à immobiliser l'ergot de fixation, et  • a jaw 60 adapted to receive the fixing lug 74 and to immobilize the fixing lug, and
• un moyen (non représenté) pour entraîner le mors en rotation selon l'axe de pliage ; l'axe de pliage, l'axe du mors et l'axe de l'ergot sont confondus lorsque l'outil est monté dans le mors.  Means (not shown) for driving the jaw in rotation along the axis of folding; the axis of folding, the axis of the jaw and the axis of the pin are combined when the tool is mounted in the jaw.
L'axe de pliage P est l'axe de la tête de pliage autour duquel le doigt de pliage est susceptible d'être entraîné en rotation. The axis of folding P is the axis of the folding head around which the folding finger can be rotated.
Des outils différents permettent de réaliser des pliages ou des cintrages différents sur des barres de diamètre et de forme différents, en fonction notamment de la forme et du diamètre du doigt de pliage, de la présence ou non d'un galet, de la forme et du diamètre du galet, de la position de l'axe du doigt de pliage et / ou de l'axe du galet par rapport à l'axe de pliage, etc. Un outil monté sur la tête de pliage peut être aisément remplacé par un autre. Different tools make it possible to make different bends or bends on bars of different diameter and shape, depending in particular on the shape and diameter of the folding finger, the presence or absence of a roller, the shape and the diameter of the roller, the position of the axis of the folding finger and / or the axis of the roller with respect to the axis of folding, etc. A tool mounted on the folding head can easily be replaced by another.
Dans les exemples représentés figures. 2a, 2b, 2c, le doigt de pliage 72 s'étend depuis une deuxième face de la pièce support et est monté en rotation libre par rapport à l'axe D du doigt de pliage, parallèle à l'axe P de pliage. In the examples shown. 2a, 2b, 2c, the folding finger 72 extends from a second face of the support piece and is mounted in free rotation relative to the axis D of the folding finger, parallel to the axis P of folding.
Dans l'exemple figure 2a, l'outil comprend également un galet de cintrage s 'étendant parallèlement au doigt de pliage, depuis la deuxième face de la pièce support selon un axe G du galet confondu avec l'axe P de pliage. Le galet est ici monté en rotation libre sur son axe. In the example in FIG. 2a, the tool also comprises a bending roller extending parallel to the folding finger, from the second face of the support piece along an axis G of the roller coinciding with the folding axis P. The roller is here mounted in free rotation on its axis.
Dans les exemples des figures 2b, 4a, 4b notamment, l'outil comprend également un galet 73 de cintrage s'étendant parallèlement au doigt 72 de pliage, depuis la deuxième face de la pièce support selon un axe G du galet parallèle à l'axe P de pliage. Le galet est ici monté en rotation libre sur son axe. In the examples of FIGS. 2b, 4a, 4b in particular, the tool also comprises a bending roller 73 extending parallel to the folding finger 72, from the second face of the support piece along an axis G of the roller parallel to the P axis of folding. The roller is here mounted in free rotation on its axis.
Dans l'exemple des figures 4a, 4b, 6a, 6b notamment, l'axe du G galet est confondu avec l'axe P de pliage et l'axe D du doigt de pliage est décalé par rapport à l'axe P de pliage. Dans l'exemple des figures 8a, 8b notamment, l'axe du galet et l'axe du doigt de pliage sont décalés par rapport à l'axe de pliage. In the example of FIGS. 4a, 4b, 6a, 6b in particular, the axis of the roller G coincides with the folding axis P and the axis D of the folding finger is offset with respect to the folding axis P. . In the example of FIGS. 8a and 8b in particular, the axis of the roller and the axis of the folding finger are offset with respect to the axis of folding.
Dans l'exemple des figures 3a, 3b, la surface externe latérale du doigt de pliage est une surface de révolution autour de l'axe du doigt de pliage, plus précisément une surface en creux formant une gorge dans laquelle peut venir se positionner une barre cylindrique à plier. La barre est ainsi parfaitement maintenue latéralement et ne peut se déplacer en translation selon l'axe de pliage. In the example of FIGS. 3a, 3b, the lateral external surface of the folding finger is a surface of revolution about the axis of the folding finger, more precisely a hollow surface forming a groove in which a bar can be positioned. cylindrical to bend. The bar is thus perfectly maintained laterally and can not move in translation along the axis of folding.
Dans l'exemple des figures 7a, 7b, la surface externe du doigt de pliage est localement cylindrique concave, selon un axe perpendiculaire à l'axe du doigt de pliage ou l'axe du galet de cintrage, un diamètre du cylindre correspondant au diamètre d'une barre à plier. Elle est ainsi parfaitement adaptée à venir en appui sur la surface d'un tube pour la réalisation d'un pli sans glissement. In the example of FIGS. 7a, 7b, the external surface of the folding finger is locally concave cylindrical, along an axis perpendicular to the axis of the folding finger or the axis of the bending roller, a diameter of the cylinder corresponding to the diameter a bar to bend. It is thus perfectly adapted to rest on the surface of a tube for making a fold without sliding.
Les moyens d'entraînement en rotation du doigt par rapport à l'axe de pliage et les moyens d'entraînement en translation des extrémités 82, 92 des bielles sont commandés par des moyens de commande numériques, en d'autre terme par un logiciel de commande paramétrable par un utilisateur en fonction des pliages à réaliser. L'axe de pliage de la machine est un axe horizontal, perpendiculaire à l'axe longitudinal de la barre à plier. Les moyens d'entraînement en translation des extrémités 82, 92 des bielles permettent de positionner avec précision le point d'intersection de l'axe de pliage de la machine dans le plan vertical passant par l'axe longitudinal de la barre à plier. Ensuite, la rotation du doigt de pliage selon l'axe de pliage, éventuellement en combinaison avec un déplacement simultané de l'axe de pliage, permet de réaliser le pliage recherché, comme on va le voir dans les exemples ci- dessous. The drive means in rotation of the finger with respect to the axis of folding and the drive means in translation of the ends 82, 92 of the connecting rods are controlled by digital control means, in other words by a control software. user-configurable control depending on the bends to be made. The bending axis of the machine is a horizontal axis, perpendicular to the longitudinal axis of the bar to bend. The drive means in translation of the ends 82, 92 of the connecting rods allow to accurately position the point intersection of the bending axis of the machine in the vertical plane passing through the longitudinal axis of the bar to bend. Then, the rotation of the folding finger along the axis of folding, possibly in combination with a simultaneous movement of the folding axis, allows the desired folding, as will be seen in the examples below.
Quelques exemples de pliages réalisables avec une machine selon l'invention vont maintenant être décrits en relation avec les figures 3 à 8. Sur les figures, les flèches indiquent les mouvements effectués par l'outil pour réaliser un pliage. Some examples of bending feasible with a machine according to the invention will now be described in connection with Figures 3 to 8. In the figures, the arrows indicate the movements performed by the tool to perform a folding.
Les figures 3a, 3b montrent la cinématique d'un pliage d'une barre cylindrique sur le nez de pliage. L'outil utilisé comprend seulement un doigt de pliage, dont l'axe est décalé par rapport à l'axe de pliage. La barre est amenée à travers le nez de pliage, et est immobilisée dans le nez de pliage. En position initiale (fig. 3a), le doigt de pliage 72 est positionné sous la barre, au contact de la barre. L'axe de pliage, perpendiculaire à l'axe de la barre, et passe par l'axe de la barre. Pour réaliser le pli, le doigt est entraîné en rotation selon l'axe de pliage, jusqu'à sa position finale (fig. 3b). La forme du pli est ici donnée par la forme du nez de pliage. Figures 3a, 3b show the kinematics of a folding of a cylindrical bar on the nose of folding. The tool used comprises only a folding finger, the axis of which is offset with respect to the axis of folding. The bar is fed through the bend nose, and is immobilized in the bend nose. In the initial position (FIG 3a), the folding finger 72 is positioned under the bar, in contact with the bar. The folding axis, perpendicular to the axis of the bar, and passes through the axis of the bar. To make the fold, the finger is rotated along the axis of folding, to its final position (Figure 3b). The shape of the fold is here given by the shape of the folding nose.
Les figures 4a, 4b montrent la cinématique de réalisation d'un pli sur l'axe de pliage. L'outil utilisé comprend un galet dont l'axe est confondu avec l'axe de pliage, et un doigt de pliage dont l'axe est décalé par rapport à l'axe de pliage. La barre est amenée à travers le nez de pliage, et dépasse en aval du nez de pliage d'une longueur suffisante pour former le pli sans que la tête de pliage vienne au contact du nez de pliage. En position initiale (fig. 4a), l'axe de pliage est positionné par rapport à la barre de sorte que le galet et le doigt de pliage soient en contact avec la barre à plier, l'un étant au dessus et l'autre au dessous de la barre. Puis le doigt de pliage est entraîné en rotation et glisse ou roule sur l'extrémité de la barre qui se plie, jusqu'à la position finale (fig. 4b). La tête de pliage étant suffisamment éloignée du nez de pliage, le pliage peut aller dans l'exemple représenté jusqu'à la réalisation d'une boucle fermée. Figures 4a, 4b show the kinematic embodiment of a fold on the fold axis. The tool used comprises a roller whose axis coincides with the axis of folding, and a folding finger whose axis is offset with respect to the axis of folding. The bar is fed through the bending nose, and protrudes downstream of the bending nose by a sufficient length to form the bend without the bending head coming into contact with the bending nose. In the initial position (Fig. 4a), the folding axis is positioned relative to the bar so that the roller and the folding finger are in contact with the bar to be folded, one being above and the other below the bar. Then the bending finger is rotated and slides or rolls on the end of the bending bar to the end position (Fig. 4b). The folding head being sufficiently far away from the folding nose, the folding can go in the example shown until the realization of a closed loop.
Les figures 5a à 5c montrent la cinématique de réalisation de plusieurs plis successifs à 90° le long d'une barre cylindrique. L'outil utilisé est le même que dans l'exemple des figures 4a, 4b. Sur la figure 5a, le premier pli (le plus proche du nez de pliage le long de la barre) est déjà réalisé et le deuxième pli, en aval du premier vient d'être terminé. Le galet est positionné à l'intérieur du deuxième pli, et le doigt de pliage est positionné à l'extérieur du deuxième pli, en aval du galet. Pour réaliser le troisième pli, l'axe de pliage est tout d'abord décalé en translation selon un axe parallèle à l'axe de la barre dans le nez de pliage jusqu'à la position où le pliage doit être réalisé (fig. 5b), puis le doigt est entraîné en rotation pour réaliser le pliage (fig. 5c). Dans l'exemple des figures 5a-5c, une pièce plate à section rectangulaire a ainsi été réalisée. Figures 5a to 5c show the kinematic embodiment of several successive folds at 90 ° along a cylindrical bar. The tool used is the same as in the example of Figures 4a, 4b. In Figure 5a, the first fold (closest to the bending nose along the bar) is already made and the second fold, downstream of the first has just been completed. The roller is positioned inside the second fold, and the folding finger is positioned outside the second fold, downstream of the roller. To make the third fold, the fold axis is first shifted in translation along an axis parallel to the axis of the bar in the bending nose to the position where the bending is to be made (FIG. ), then the finger is rotated to make the folding (Fig 5c). In the example of Figures 5a-5c, a flat piece with a rectangular section has been made.
Les figures 6a, 6b montrent la cinématique de réalisation simultanée de deux contre-plis, l'un sur le nez de pliage, l'autre autour du galet. L'outil utilisé est le même que dans l'exemple des figures 4a, 4b. En position initiale, l'axe de pliage et le doigt de pliage sont positionnés de sorte que le doigt et le galet soient positionnés de part et d'autre de la barre à plier et en contact avec la barre. Le pli est ensuite réalisé en déplaçant la tête de pliage (et donc l'axe de pliage) selon une trajectoire courbe jusqu'à sa position finale (fig. 6b), le doigt de pliage étant maintenu immobile par rapport à l'axe de pliage. On notera qu'ici seul l'axe de pliage est déplacé pendant la phase de pliage. Au contraire des exemples précédents où seul le doigt de pliage était déplacé en rotation par rapport à l'axe de pliage pendant la phase de pliage, l'axe de pliage (et donc la tête de pliage) restant immobile. Les figures 7a, 7b montrent la cinématique de réalisation d'un pli sans glissement d'une barre cylindrique sur le nez de pliage de la machine. L'outil utilisé ici comprend un doigt de pliage dont l'axe est décalé par rapport à l'axe de pliage. Le galet est dans cet exemple inutile. En position initiale (fig. 7a), le doit de pliage est en appui sous la barre de sorte que la droite perpendiculaire à l'axe de pliage et passant par l'axe du doigt soit perpendiculaire à la barre à plier. Le pli est ensuite réalisé en déplaçant en rotation la tête de pliage et l'axe de pliage, le doigt étant maintenu immobile par rapport à l'axe de pliage (fig. 7b). Le pli est ici réalisé sans glissement, c'est-à-dire que le point de contact entre la barre et la droite perpendiculaire à l'axe de pliage et passant par l'axe du doigt est le même pendant toute la phase de pliage. On notera que, dans cet exemple, pendant la phase de pliage, le doigt de pliage est immobile, et notamment ne tourne pas sur lui-même, comme cela peut être le cas dans les exemples précédents. Figures 6a, 6b show the kinematics of simultaneous realization of two against-folds, one on the nose of folding, the other around the roller. The tool used is the same as in the example of Figures 4a, 4b. In the initial position, the folding axis and the folding finger are positioned so that the finger and the roller are positioned on either side of the bar to be folded and in contact with the bar. The fold is then made by moving the folding head (and therefore the folding axis) along a curved path to its final position (FIG 6b), the folding finger being held stationary relative to the axis of folding. folding. Note that here only the folding axis is moved during the folding phase. In contrast to the previous examples where only the folding finger was rotated relative to the folding axis during the folding phase, the folding axis (and thus the folding head) remaining stationary. Figures 7a, 7b show the kinematic embodiment of a fold without sliding of a cylindrical bar on the bending nose of the machine. The tool used here comprises a folding finger whose axis is offset with respect to the axis of folding. The roller is in this example useless. In the initial position (Fig. 7a), the fold must be under the bar so that the line perpendicular to the fold axis and passing through the axis of the finger is perpendicular to the bar to bend. The fold is then made by moving in rotation the folding head and the folding axis, the finger being held stationary relative to the folding axis (FIG 7b). The fold is here produced without slippage, that is to say that the point of contact between the bar and the straight line perpendicular to the axis of folding and passing through the axis of the finger is the same throughout the folding phase . Note that in this example, during the folding phase, the folding finger is immobile, and in particular does not rotate on itself, as may be the case in the previous examples.
Bien sûr, bien d'autres plis peuvent être envisagés avec une machine selon l'invention, en fonction notamment :Of course, many other folds can be envisaged with a machine according to the invention, in particular according to:
• de la forme et des dimensions du nez utilisé • the shape and dimensions of the nose used
• de la forme et des dimensions de l'outil utilisé, avec un doigt, et avec ou sans galet  • the shape and dimensions of the tool used, with a finger, and with or without a roller
• du mouvement de l'axe de pliage (de la tête de pliage) avant et / ou pendant la phase de pliage, le point d'intersection de l'axe de pliage pouvant décrire une courbe quelconque dans le plan vertical par une commande approprié des moyens d'entraînement en translation des deuxièmes extrémités 82, 92 des bielles 80, 90, The movement of the folding axis (of the folding head) before and / or during the folding phase, the point of intersection of the folding axis being able to describe any curve in the vertical plane by an appropriate command translation drive means of the second ends 82, 92 of the connecting rods 80, 90,
• du mouvement de rotation du doigt de pliage par rapport à l'axe de pliage par une commande approprié du moyen d'entraînement en rotation du doigt de pliage. The rotational movement of the folding finger with respect to the folding axis by appropriate control of the means for rotating the folding finger.
Nomenclature Nomenclature
10 bras  10 arms
20 nez de pliage porté par le bras  20 folding nose carried by the arm
30, 40 moyens pour entraîner en translation un pied d'une bielle 80, 90  30, 40 means for driving in translation a foot of a rod 80, 90
50 tête de pliage 50 folding head
60 mors de la tête de pliage  60 jaws of the folding head
70 outil  70 tool
71 pièce support  71 support piece
74 ergot s'étendant selon l'axe de pliage lorsque l'outil est monté dans le mors 74 lug extending along the axis of folding when the tool is mounted in the jaw
72 doigt de pliage, rotatif par rapport à un axe D parallèle à l'axe de pliage P72 folding finger, rotatable relative to an axis D parallel to the folding axis P
73 galet, rotatif par rapport à un axe G parallèle à l'axe de pliage P 73 roller, rotatable relative to an axis G parallel to the axis of folding P
80, 90 bielles  80, 90 connecting rods
81, 82 : tête et pied de la bielle 80  81, 82: head and foot of the connecting rod 80
91, 92 : tête et pied de la bielle 90  91, 92: head and foot of the connecting rod 90
100 barre 100 bar
P axe de pliage Folding axis
B axe de défilement B scrolling axis
G axe du galet G axis of the roller
D axe du doigt D axis of the finger
A axe de l'articulation des deux bielles 80, 90  A axis of the articulation of the two connecting rods 80, 90

Claims

REVENDICATIONS
1. Machine pour le cambrage, le formage, le pliage ou le cintrage d'une barre (100) selon un axe de pliage (P), machine comportant : 1. Machine for bending, forming, bending or bending a bar (100) along a bending axis (P), machine comprising:
• un bras (10),  An arm (10),
• un nez de pliage (20) porté par le bras,  A folding nose (20) carried by the arm,
• une tête de pliage (50) comprenant un doigt de pliage (72) rotatif par rapport à l'axe de pliage (P), A folding head (50) comprising a folding finger (72) rotatable with respect to the folding axis (P),
• un poste d'amenage situé en amont du nez de pliage (20) pour déplacer la barre (100) selon un axe de défilement (B) et à travers le nez de pliage (20), machine caractérisée en ce que la tête de pliage comprend également : A feeding station situated upstream of the bending nose (20) for moving the bar (100) along a running axis (B) and through the bending nose (20), characterized in that the head of the bending nose (20) Folding also includes:
• une première bielle (80) portant le doigt de pliage (72),  A first connecting rod (80) carrying the folding finger (72),
• une deuxième bielle (90) dont une tête (91) est couplée à une tête (81) de la première bielle (80) en rotation par rapport à un axe d'articulation (A) perpendiculaire à l'axe de défilement (B) ,  A second connecting rod (90) of which a head (91) is coupled to a head (81) of the first connecting rod (80) in rotation relative to an articulation axis (A) perpendicular to the axis of movement (B ),
• un premier moyen d'entraînement (30) pour entraîner en translation un pied (82) de la première bielle (80) selon un axe parallèle à l'axe de défilement (B), et un deuxième moyen d'entraînement (40) pour entraîner en translation un pied (92) de la deuxième bielle (90) selon un axe parallèle à l'axe de défilement (B).  A first drive means (30) for driving in translation a foot (82) of the first connecting rod (80) along an axis parallel to the running axis (B), and a second driving means (40). to drive in translation a foot (92) of the second link (90) along an axis parallel to the scroll axis (B).
2. Machine selon la revendication 1, dans lequel le bras (10) est monté rotatif selon l'axe de défilement (B) par rapport à un bâti de la machine. 2. Machine according to claim 1, wherein the arm (10) is rotatably mounted along the axis of travel (B) relative to a frame of the machine.
3. Machine selon l'une des revendications précédentes, dans laquelle la tête de pliage (50) comprend également un galet de cintrage (73) monté rotatif par rapport à un axe du galet (G) parallèle à l'axe de pliage (P). 3. Machine according to one of the preceding claims, wherein the folding head (50) also comprises a bending roller (73) rotatably mounted relative to an axis of the roller (G) parallel to the axis of folding (P ).
4. Machine selon l'une des revendications précédentes, dans laquelle le doigt de pliage (72) est en rotation libre selon un axe du doigt de pliage (D) parallèle à l'axe de pliage (P). 4. Machine according to one of the preceding claims, wherein the folding finger (72) is in free rotation along an axis of the folding finger (D) parallel to the axis of folding (P).
5. Machine selon l'une des revendications précédentes, dans laquelle la tête de pliage (50) comprend également un outil (70) monté de manière amovible sur la tête de pliage, l'outil comprenant une pièce support (71) sur laquelle le doigt de pliage (72) est monté, la tête de pliage comprenant un moyen pour entraîner en rotation la pièce support de l'outil selon l'axe de pliage (P). 5. Machine according to one of the preceding claims, wherein the folding head (50) also comprises a tool (70) removably mounted on the folding head, the tool comprising a support piece (71) on which the folding finger (72) is mounted, the folding head comprising means for rotating the support piece of the tool along the axis of folding (P).
6. Machine selon la revendication 5 en combinaison avec la revendication 3, dans laquelle le galet de cintrage (73) est monté sur la pièce support (71) de l'outil (70). 6. Machine according to claim 5 in combination with claim 3, wherein the bending roller (73) is mounted on the support part (71) of the tool (70).
7. Machine selon l'une des revendications 5 à 6, dans laquelle l'outil (70) comprend un ergot de fixation (74) s'étendant depuis une première face de la pièce support l'outil, le doigt de pliage et éventuellement le galet s'étendant depuis une deuxième face de la pièce support de l'outil, et dans laquelle la tête de pliage comprend : 7. Machine according to one of claims 5 to 6, wherein the tool (70) comprises a fixing lug (74) extending from a first face of the support part the tool, the folding finger and optionally the roller extending from a second face of the support piece of the tool, and wherein the folding head comprises:
• un mors adapté à recevoir l'ergot de fixation et à immobiliser l'ergot de fixation, et  A jaw adapted to receive the fixing lug and to immobilize the fixing lug, and
• un moyen pour entraîner le mors et l'outil en rotation selon un axe du mors formant l'axe de pliage (P). • means for driving the jaw and the tool in rotation along an axis of the jaw forming the folding axis (P).
8. Machine selon l'une des revendications précédentes, dans laquelle l'axe du doigt de pliage (D) ou l'axe du galet de cintrage (G) est confondu avec l'axe de pliage (P). 8. Machine according to one of the preceding claims, wherein the axis of the folding finger (D) or the axis of the bending roller (G) coincides with the axis of folding (P).
9. Machine selon l'une des revendications précédentes, dans laquelle la surface externe latérale du doigt de pliage et / ou du galet de cintrage est une surface de révolution autour de l'axe du doigt de pliage ou de l'axe du galet de cintrage. 9. Machine according to one of the preceding claims, wherein the lateral outer surface of the folding finger and / or the bending roller is a surface of revolution about the axis of the bending pin or the axis of the roller of bending.
10. Machine selon l'une des revendications précédentes, dans laquelle la surface externe du doigt de pliage est localement : 10. Machine according to one of the preceding claims, wherein the outer surface of the folding finger is locally:
• plane, dans un plan parallèle à l'axe du doigt de pliage ou l'axe du galet de cintrage, ou  • plane, in a plane parallel to the axis of the folding finger or the axis of the bending roller, or
• cylindrique concave, selon un axe perpendiculaire à l'axe du doigt de pliage ou l'axe du galet de cintrage, un diamètre du cylindre correspondant au diamètre d'une barre à plier.  Concave cylindrical, along an axis perpendicular to the axis of the folding finger or the axis of the bending roller, a diameter of the cylinder corresponding to the diameter of a bar to bend.
EP13715310.2A 2012-03-24 2013-03-13 Bending machine having a bending head that is movable about a stationary bending shank Active EP2828015B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1200880A FR2988309B1 (en) 2012-03-24 2012-03-24 BENDING MACHINE WITH A MOBILE FOLDING HEAD AROUND A FIXED FOLDING NOSE
PCT/FR2013/050522 WO2013144477A1 (en) 2012-03-24 2013-03-13 Bending machine having a bending head that is movable about a stationary bending shank

Publications (2)

Publication Number Publication Date
EP2828015A1 true EP2828015A1 (en) 2015-01-28
EP2828015B1 EP2828015B1 (en) 2016-01-20

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US (1) US20150040634A1 (en)
EP (1) EP2828015B1 (en)
BR (1) BR112014023548B1 (en)
CA (1) CA2867641C (en)
FR (1) FR2988309B1 (en)
WO (1) WO2013144477A1 (en)

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AT516371B1 (en) * 2014-12-02 2016-05-15 Stonawski Rudolf Device for bending a profile workpiece
CN104889212B (en) * 2015-06-11 2017-01-18 张家港江苏科技大学产业技术研究院 Wheel mould device for two-way pipe bending
DE102016105935B4 (en) 2016-03-31 2018-04-26 Wafios Aktiengesellschaft Winding tool for a spring winding machine
IT201600119591A1 (en) * 2016-11-25 2018-05-25 Crippa Spa Machine for bending filiform material such as a pipe with a system for the simultaneous loading of the pipe to be bent and discharge of the curved pipe
IT202100022250A1 (en) * 2021-08-24 2023-02-24 Simat S R L MACHINE AND PROCEDURE FOR FOLDING AN OBLONG PRODUCT
IT202100031601A1 (en) * 2021-12-16 2023-06-16 Schnell Spa EQUIPMENT AND METHOD FOR BENDING BARS

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FR2988309A1 (en) 2013-09-27
CA2867641A1 (en) 2013-10-03
FR2988309B1 (en) 2015-06-05
WO2013144477A1 (en) 2013-10-03
BR112014023548B1 (en) 2020-07-21
EP2828015B1 (en) 2016-01-20
CA2867641C (en) 2019-05-14
US20150040634A1 (en) 2015-02-12

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