EP0952896A1 - Machine for bending tubes with small diameter - Google Patents

Machine for bending tubes with small diameter

Info

Publication number
EP0952896A1
EP0952896A1 EP98902049A EP98902049A EP0952896A1 EP 0952896 A1 EP0952896 A1 EP 0952896A1 EP 98902049 A EP98902049 A EP 98902049A EP 98902049 A EP98902049 A EP 98902049A EP 0952896 A1 EP0952896 A1 EP 0952896A1
Authority
EP
European Patent Office
Prior art keywords
axis
tube
rollers
along
bending
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
EP98902049A
Other languages
German (de)
French (fr)
Other versions
EP0952896B1 (en
Inventor
Philippe Jaubert
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.)
Robolix
Original Assignee
Robolix
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 Robolix filed Critical Robolix
Publication of EP0952896A1 publication Critical patent/EP0952896A1/en
Application granted granted Critical
Publication of EP0952896B1 publication Critical patent/EP0952896B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
    • 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
    • B21D7/021—Construction of forming members having more than one groove

Definitions

  • the invention relates to a machine for bending small diameter tubes, in particular less than 10 mm, precut and having connection systems at each of their ends. It also relates to a bending head intended to equip such a machine.
  • Current bending machines used for bending such tubes conventionally include a frame on which are mounted bending means provided with bearing surfaces between which passes, is clamped and wound up the bending tube, said bending means being mounted on a folding head capable of pivoting about an axis coaxial with the axis of the bending shape.
  • these bending machines generally include a guide strip disposed upstream of the clamping jaw and optionally a crease-removing element disposed upstream of the bending form.
  • they include means for longitudinal displacement of the tube relative to the frame.
  • a first solution consists in providing the bending machines with a digitally controlled clamp adapted to rotate the tube around its axis in order to change the direction of bending.
  • bending machines have a first drawback resulting from the fact that, when the direction of bending is changed, the movements of the tube generate so-called "whiplash" phenomena which may in particular alter the shape of the part produced.
  • a second solution consists in making bending machines provided with means for driving the folding head in rotation capable of rotating the latter around the tube.
  • this solution is currently exclusively used with tubes packaged in the form of a coil and not with pre-cut tubes and fitted with fittings beforehand.
  • fittings it turns out that the installation of these fittings is more complex and longer when it is carried out on initially bent products.
  • a third solution finally consists in making bending machines provided with a double folding head associated with drive means in rotation and / or in translation making it possible to bring the second folding head into the working position.
  • this solution leads to the production of relatively complex and bulky bending machines, and therefore of a significant cost price.
  • the change in the direction of bending makes it necessary to move the folding heads, an operation which requires a relatively long time which leads to penalizing the productivity of the machine.
  • the present invention aims to alleviate all of the aforementioned drawbacks of current bending machines and has as main objective to provide a machine of very simple design therefore of a relatively low cost price and space-saving, allowing to achieve with a very high rate high production of parts of complex geometry, not achievable with current machines as described above, from straight tubes of small diameter, pre-cut and provided with connection systems at each of their ends.
  • Another objective of the invention is to produce, with a high rate, parts comprising turns.
  • the invention relates to a bending machine comprising a frame on which is mounted at least one bending head, and means for longitudinal displacement of the tube relative to the frame along an axis (X).
  • this bending machine is characterized in that:
  • the longitudinal displacement means comprise means for gripping the rear end of the tube, and means for driving said gripping means along the longitudinal axis (X),
  • each bending head comprises: two forming rollers each having at least one peripheral groove of semicircular section adapted to form, in an adjoining position of said rollers, a guide duct having a neck of diameter substantially greater than that of the tube,
  • means for relative displacement of the forming rollers capable of positioning said rollers either in their adjoining position or in a so-called open position, capable of allowing the passage of the tube along an axis perpendicular to the axis (X),
  • a folding finger disposed downstream and near the forming rollers
  • a bending machine is designed to allow bending of precut tubes with connection systems at each of their ends.
  • the gripping means are adapted to ensure the maintenance of the rear end of the tube provided with its connection system and on the other hand, the "opening" faculty of the guide rollers, allows thread the pre-cut straight tube fitted with its connection systems, either manually or by means of a loading system.
  • a bending machine allows the production of parts of complex and varied geometries since it allows to realize:
  • the tube guide members arranged upstream of the rollers play a vital role because by ensuring the maintenance of this tube, they avoid possible deformations of the portion of tube extending between the gripping means and said rollers.
  • the retractable nature of these guide members makes it possible to move the gripping means until the latter come into contact with the rollers, and consequently, to proceed to bending almost the entire length of the tubes.
  • the bending machine according to the invention also has the advantage of making it very easy to bend the tubes in both directions, the only operations to be carried out with a view to changing the bending consisting of combining translational displacements and a displacement according to its circular trajectory, with the folding finger.
  • this bending machine allows very high bending rates, and moreover due to its simple design (only the bending finger is caused to be moved) leads to the production of a bending head of small bulk.
  • the forming rollers comprise two superimposed grooves of sections adapted to form two guide conduits having necks of different diameters.
  • means for translational movement of the forming rollers respectively along an axis (Y2). ( ⁇ 3) parallel to (Y) are adapted to position the latter so that one or the other of their grooves is oriented relative to the longitudinal axis (X).
  • This arrangement allows, without requiring any adjustment, to bend a tube having two different diameters, such as for example a tube of which certain portions of length are sheathed, and / or to bend a tube with different bending radii.
  • the bending machine comprises means for translational movement of the folding finger able to move it radially relative to the axis (Y).
  • the fact of being able to move the bending finger relative to the forming rollers makes it possible to vary the length of the straight tube portions between two bending operations, and in particular to produce straight tube portions of very short length.
  • the bending machine further comprises, preferably, a strip arranged upstream of the forming rollers in contact with them, and having a bearing face forming a support for the tube, said strip being associated with suitable displacement means. to bring it into a retracted position allowing to advance the gripping means in contact with the forming rollers.
  • this strip has the shape of a U, the means for moving said strip consisting of pivoting means able to tilt it around an axis orthogonal to the axes (X) and (Y) .
  • the means for relative displacement of the forming rollers comprise means for driving each of these rollers in rotation around the axes (Y2) '(Y3), said rollers having a suitable non-circular shape to free up space when they rotate from their adjoining position.
  • This mode of relative movement of the rollers has the advantage of leading to an optimization of the size of the bending head because the translation of said rollers aiming to use one or the other of their grooves, as well as their relative movement are operated around single axes (Y2), ( ⁇ 3) -
  • rollers of different sizes making it possible to produce bends of different radii and / or bends of tubes of different diameters.
  • each forming roller is mounted on a shaft extending respectively along the axis (2). ( ⁇ 3) / the drive means are in rotation said rollers comprising two pinions, each mounted on one of the shafts, a rack with two toothed lateral faces arranged to engage each with a pinion, and means for driving the rack along a longitudinal axis (X-
  • each roller is advantageously constituted by a rod of a jack arranged so as to cause the translational displacements of said roller respectively along the axis (Y2), ( ⁇ 3 -> -
  • the bending machine comprises a support member retractable laterally relative to the axis (X) arranged to come into contact with a generator of the tube diametrically opposite to that resting on the face support of the strip, upstream and near the forming rollers.
  • This support member has the function, for bending machines which conventionally allow the bending head to rotate around the tube in order to perform multidirectional bends, to ensure that the tube is held in position when, during the opening of the rollers, the bending head is arranged so that said tube is located under the strip.
  • this support member advantageously consists of a cable extending inside a sheath, one end of this cable being secured to a jack rod arranged to cause said cable to slide to the inside said sheath, and the other end of this cable extending along a plane orthogonal to the planes (X) and (Y) so as to be positioned in contact with the tube during the displacement of the jack.
  • the bending machine comprises two support plates having a convex support face, arranged orthogonally to the axis (X), on either side of the latter, upstream of the forming rollers, said bearing plates being offset with respect to said forming rollers along an axis parallel to the axis ( Y), and arranged so that during the formation of turns, the tube is caused after bending to move on the bearing face of one of the bearing plates.
  • Such support plates have the advantage of making it possible to form turns having a determined pitch.
  • the bending machine comprises:
  • - digital control means programmed to calculate the length developed for the formation of each turn, compare this value with a memorized value representative of the theoretical developed length necessary for the formation of a turn, and control, as a function of the result of this comparison, a displacement of the folding finger along its circular trajectory with a view to the formation of the next turn of the turn, so that the total length developed for the formation of a turn is strictly the same for a series of identical products.
  • the guide members of the tubes are preferably each arranged on the end of an arm pivotally mounted relative to the frame and associated with elastic means capable of holding it in a position inclined towards the rear relative to the direction of movement of said tube.
  • This design provides self-locking of the guide members during the displacement of the tube, while allowing the retraction, by pivoting, of the latter under the effect of the force exerted by the gripping means.
  • the invention extends to a bending head comprising:
  • rollers each having at least one peripheral groove of semicircular section adapted to form, in an adjoining position of said rollers, a guide duct oriented along an axis (X), having a neck of diameter substantially greater than that of the tube,
  • - tube guide members arranged on either side of the axis (X) so as to come into contact with said tube upstream and near the forming rollers, said guide members being adapted to retract transversely under the effect of a longitudinal force exerted by the gripping means.
  • FIG. 1 is a side view, partially in longitudinal section, through an axial plane, of a bending machine according to the invention
  • FIG. 2 is a top view of this bending machine
  • FIG. 3 is a cross section through a vertical plane A
  • FIG. 4 is a partial longitudinal section through a plane B, on an enlarged scale, of the retractable guide means of this bending machine
  • FIG. 5 is a schematic perspective view of this bending machine during the production of turns.
  • the bending machine shown by way of example in FIGS. 1 to 3 is suitable for bending tubes 1 of small diameter, such as for example with a diameter of 4.75 mm, precut to a predetermined length, and provided of fittings 2, 3 at each of their ends.
  • This bending machine comprises, first of all, a frame 4 on which is mounted a bending head described below, and a clamp 5 capable of enclosing the rear end of the tube 1 downstream of the connector 3, said clamp being housed inside a cylindrical duct 6 and associated with conventional drive means (not shown) able to move it longitudinally along an axis (X) relative to the frame 4.
  • this bending machine can be provided, either means for driving the clamp 5 in rotation about the axis (X), or means for driving the frame 4 in rotation around the clamp 5, and this in the goal of making multidirectional bends.
  • the bending heads described below can also be fitted to a bending machine as described in patent FR 2,554,021.
  • the bending machine will however be described below in a fixed position as shown in FIGS. figures allowing the tube 1 to be bent either to the right or to the left, by forming in a horizontal plane, and to make turns with a vertical axis of revolution.
  • the bending head comprises two forming rollers 7, 8 of generally semi-circular shape (as shown in the figures) or semi-elliptical, each provided with two superimposed grooves 9, 10, of semi-circular sections, for guiding tubes of different diameters, such as for example a tube 1 of given diameter and the same tube 1 covered with a sheath.
  • Each of these forming rollers 7, 8 is mounted on the upper end of a vertical rotation shaft 12, 13 to which it is secured by means of a screw 11, each of said shafts being housed and mounted to rotate inside bores in a housing 14.
  • ( ⁇ 3) comprise, for each of said shafts, a pinion 15, 16 mounted around and integral with the latter. They also include a rack 17 extending horizontally and provided with two toothed lateral faces arranged to mesh each with one of the pinions 15, 16.
  • the means for rotating the shafts 12, 13 finally comprise a jack 70 arranged horizontally, the body of which is secured to the frame 4, and the rod of which is secured to the rack 17 so as to cause the displacements of the latter. along a horizontal axis (X-)).
  • Such rotational drive means are used to rotate the forming rollers 7, 8 by an angle of 90 degrees between:
  • the forming rollers 7, 8 are also associated with drive means in translation respectively along the axes (Y2). (Y3). able to bring either one or the other groove 9, 10 in the axis of the plane of movement of the tube 1.
  • These translational drive means comprise, for each shaft 12, 13, a piston 18, 19 secured under the lower end of said shaft by means of a screw such as 20, each of said pistons extending in a jack chamber 21, 22 formed in the housing 14, and conventionally provided with fluid inlets capable of allowing the displacements of the pistons to be generated.
  • the bending head also comprises a folding finger 23 consisting of a cylindrical roller disposed downstream of the forming rollers 7, 8 and associated with: - means for moving said folding finger along a circular path centered on an axis ( y) coplanar with the axes (2). (Y3) / and perpendicular to the axis (X), means for translational movement of said folding finger along an axis (Y-
  • the bending machine comprises, first of all, a rotary block 24 integral with a motor shaft 25 extending along the axis (Y) and located under the housing 14, said shaft being rotatably mounted relative to the frame 4 by means of bearings such as 26, and being driven in rotation by a gear motor 27 coaxial with the latter.
  • the bending machine comprises a first carriage 28 mounted on the rotary block 24 by means of a translational guidance system 29 in the form of dovetail, and secured to the rod of a jack 30 arranged vertically, the body of which is carried by a horizontal plate 31 fixed to the rotary block 24.
  • the bending machine comprises a second carriage 32 mounted on the first carriage 28 by means of a guide system in the form of a dovetail, and secured to the rod of a jack 33 arranged horizontally, the body of which is carried by the first carriage 28.
  • the folding finger 23 is for its part carried by this second carriage 32 and is arranged in line with the end of an inclined arm 34 extending above said second carriage in the direction of the forming rollers 7,8.
  • the bending machine further comprises first and second tube guide means 1 arranged to prevent any deformation of said tube upstream of the forming rollers 7, 8.
  • the first guide means consist of a strip 35 disposed immediately upstream forming rollers 7, 8 and having a bearing face forming a support for the tube 1.
  • This strip 35 consists in a U-shaped jumper centered on the axis (X), and is mounted on a piece 36 strip holder articulated relative to the frame 4 around a horizontal axis orthogonal to the axis (X), so as to allow the strip 35 to be retracted by pivoting the latter, and to bring the clamp 6 into contact with the forming rollers 7, 8.
  • the pivoting means of this strip 35 consist, in turn, of a cylinder 37 extending along an axis inclined substantially 45 ° relative to the axis (X), the rod of which is articulated on said strip, and whose the body is articulated inside a yoke 38 secured to the frame 4.
  • the second guide means comprise, as shown in Figure 4, two rollers 39, 40 each carried by an arm such as 50 extending through a lumen formed in the conduit 6 for guiding the clamp 5, said arms being pivotally mounted, each on a lug such as 41 secured to a flange 51 mounted on the duct 6.
  • spiral springs such as 52 arranged around the rotation shaft of the arms 50 and secured to the lugs 41 and of said arms, are adapted to maintain the latter, in the absence of stress, in a position where they are inclined rearward relative to the direction of movement of the tube 1.
  • rollers 39, 40 maintain and guide the tube 1 during the longitudinal displacement of the latter, but retract transversely under the effect of the pressure exerted by the clamp 5 when the latter comes into contact with said rollers.
  • the bending machine further comprises a support member adapted to provide support for the tube 1 when the frame 4 is pivoted by 180 ° relative to the position shown in the figures, and when the rollers are "opened" 7, 8.
  • This support member consists of a cable 53 extending inside a sheath 54, one of the ends of this cable being secured to the rod of a jack 55 arranged to cause said cable to slide inside said sheath, and the other end being arranged so as to come to be positioned transversely under the tube 1 (in the position above of the frame 4) during the deployment of the jack 55.
  • the bending machine further comprises two support plates 56, 57 intended to enable the pitch of the turns to be determined during the formation of the latter.
  • these two support plates 56, 57 consist of two curved plates having a convex upper face, arranged orthogonally to the axis (X) on either side of the latter, upstream of the rollers of forming 7, 8 and offset upwards relative to said axis (X).
  • these support plates 56, 57 are carried by vertical lugs such as 59 pierced with an oblong hole with a large vertical axis and secured to the frame 4 by means of screws such as 60 for adjusting the height position of said support plates and therefore to modify the pitch of the turns.
  • the tube 1 is caused to move on the upper face of one of the support plates 56, 57 which therefore determines the pitch of this turn, adjustable according to the position in height of the latter.
  • the bending machine finally comprises two cells 61, 62 arranged upstream of the support plates 56, 57 symmetrically on either side of the axis (X) so that the beam of one of said cells is cut by the end strand of the tube 1 during the formation of turns.
  • These two cells 61, 62 associated with a numerically controlled bending machine are intended to allow, during the production of a series of identical products, to consume a fixed developed length for the formation of turns, and to form turns whose angle of the output strand and the angle of the input strand are always the same.
  • the bending machine is programmed, during each turn of the turn, to:

Abstract

The invention concerns a machine for bending tubes (1) of small diameter, previously cut and provided with connecting systems at each of their ends. Said machine comprises means for grasping (5) the rear end of the tube (1), means for driving said grasping means along a longitudinal axis, and at least a bending head comprising two forming rollers (7, 8) each having at least a peripheral groove, a folding pin (23) associated with means (24) for moving along a circular path centred on an axis (Y) orthogonal to axis (X), and with means (29) for moving in translation along an axis (Y1) parallel to (Y), and with devices for guiding the tube (1) arranged upstream and in the proximity of the forming rollers (7, 8).

Description

MACHINE A CINTRER DES TUBES DE FAIBLE DIAMETRE LOW DIAMETER BENDING MACHINE
L'invention concerne une machine à cintrer des tubes de faible diamètre, notamment inférieurs à 10 mm, prédécoupés et présentant des systèmes de raccord à chacune de leurs extrémités. Elle vise également une tête de cintrage destinée à équiper une telle machine.The invention relates to a machine for bending small diameter tubes, in particular less than 10 mm, precut and having connection systems at each of their ends. It also relates to a bending head intended to equip such a machine.
Les machines à cintrer actuelles utilisées pour le cintrage de tels tubes comprennent classiquement un bâti sur lequel sont montés des moyens de cintrage dotés de surfaces d'appui entre lesquelles passe, est serré puis enroulé le tube à cintrer, lesdits moyens de cintrage étant montés sur une tête de pliage apte à pivoter autour d'un axe coaxial avec l'axe de la forme de cintrage. De plus, ces machines à cintrer comprennent généralement une réglette de guidage disposée en amont du mors de serrage et éventuellement un élément efface-plis disposé en amont de la forme de cintrage. Enfin, elles comprennent des moyens de déplacement longitudinal du tube relativement au bâti.Current bending machines used for bending such tubes conventionally include a frame on which are mounted bending means provided with bearing surfaces between which passes, is clamped and wound up the bending tube, said bending means being mounted on a folding head capable of pivoting about an axis coaxial with the axis of the bending shape. In addition, these bending machines generally include a guide strip disposed upstream of the clamping jaw and optionally a crease-removing element disposed upstream of the bending form. Finally, they include means for longitudinal displacement of the tube relative to the frame.
L'inconvénient majeur de ces machines à cintrer réside dans le fait qu'elles ne permettent d'effectuer les cintrages des tubes que d'un seul côté, soit vers la droite, soit vers la gauche. De plus, l'ensemble de positionnement du mors de serrage et 1 ' ensemble de déplacements de la réglette génèrent un encombrement limitant la géométrie des pièces finales cintrées.The major drawback of these bending machines is that they only allow bending of the tubes on one side, either to the right or to the left. In addition, the positioning assembly of the clamping jaw and the set of displacements of the strip generate a space limiting the geometry of the bent end pieces.
En vue de pallier l'inconvénient relatif au sens unique de cintrage, trois types principaux de machines à cintrer existent à l'heure actuelle.In order to overcome the drawback relating to the one-way bending direction, three main types of bending machines exist at present.
En premier lieu, une première solution consiste à doter les machines à cintrer d'une pince commandée numériquement adaptée pour faire tourner le tube autour de son axe en vue du changement du sens de cintrage. Toutefois, de telles machines à cintrer présentent un premier inconvénient résultant du fait que, lors des changements du sens de cintrage, les mouvements du tube génèrent des phénomènes dits "de coup de fouet" susceptibles notamment d'altérer la forme de la pièce réalisée.Firstly, a first solution consists in providing the bending machines with a digitally controlled clamp adapted to rotate the tube around its axis in order to change the direction of bending. However, such bending machines have a first drawback resulting from the fact that, when the direction of bending is changed, the movements of the tube generate so-called "whiplash" phenomena which may in particular alter the shape of the part produced.
Une deuxième solution consiste à réaliser des machines à cintrer dotées de moyens d'entraînement en rotation de la tête de pliage aptes à faire tourner cette dernière autour du tube. Toutefois, cette solution est à l'heure actuelle exclusivement utilisée avec des tubes conditionnés sous forme de bobine et non avec des tubes prédécoupés et munis au préalable de raccords. Or, il s ' avère que la mise en place de ces raccords est plus complexe et plus longue lorsqu'elle est effectuée sur des produits initialement cintrés.A second solution consists in making bending machines provided with means for driving the folding head in rotation capable of rotating the latter around the tube. However, this solution is currently exclusively used with tubes packaged in the form of a coil and not with pre-cut tubes and fitted with fittings beforehand. However, it turns out that the installation of these fittings is more complex and longer when it is carried out on initially bent products.
Une troisième solution consiste enfin à réaliser des machines à cintrer dotées d'une double tête de pliage associée à des moyens d'entraînement en rotation et/ou en translation permettant d'amener la deuxième tête de pliage en position de travail. Toutefois, cette solution conduit à la réalisation de machines à cintrer relativement complexes et encombrantes, et donc d'un prix de revient important. De plus, le changement de sens de cintrage oblige à déplacer les têtes de pliage, opération qui nécessite un temps relativement long qui conduit à pénaliser la productivité de la machine.A third solution finally consists in making bending machines provided with a double folding head associated with drive means in rotation and / or in translation making it possible to bring the second folding head into the working position. However, this solution leads to the production of relatively complex and bulky bending machines, and therefore of a significant cost price. In addition, the change in the direction of bending makes it necessary to move the folding heads, an operation which requires a relatively long time which leads to penalizing the productivity of the machine.
La présente invention vise à pallier 1 ' ensemble des inconvénients précités des machines à cintrer actuelles et a pour principal objectif de fournir une machine de conception très simple donc d'un coût de revient relativement faible et peu encombrante, permettant de réaliser avec une cadence très élevée la production de pièces de géométrie complexe, non réalisables avec les machines actuelles telles que décrites ci-dessus, à partir de tubes droits de petit diamètre, prédécoupés et dotés de systèmes de raccords à chacune de leurs extrémités.The present invention aims to alleviate all of the aforementioned drawbacks of current bending machines and has as main objective to provide a machine of very simple design therefore of a relatively low cost price and space-saving, allowing to achieve with a very high rate high production of parts of complex geometry, not achievable with current machines as described above, from straight tubes of small diameter, pre-cut and provided with connection systems at each of their ends.
Un autre objectif de l'invention est de réaliser, avec une cadence élevée, des pièces comportant des spires .Another objective of the invention is to produce, with a high rate, parts comprising turns.
Un autre objectif de l'invention est de réaliser, avec une cadence élevée, des pièces comportant des portions gainées . Un autre objectif de l'invention est de réaliser, avec une cadence élevée, des pièces comportant une dernière portion d'extrémité droite très courte.Another objective of the invention is to produce, with a high rate, parts comprising sheathed portions. Another objective of the invention is to produce, with a high rate, parts comprising a last portion of very short straight end.
A cet effet, l'invention vise une machine à cintrer comprenant un bâti sur lequel est monté au moins une tête de cintrage, et des moyens de déplacement longitudinal du tube relativement au bâti selon un axe (X). Selon l'invention, cette machine à cintrer se caractérise en ce que :To this end, the invention relates to a bending machine comprising a frame on which is mounted at least one bending head, and means for longitudinal displacement of the tube relative to the frame along an axis (X). According to the invention, this bending machine is characterized in that:
- les moyens de déplacement longitudinal comprennent des moyens de préhension de l'extrémité arrière du tube, et des moyens d'entraînement desdits moyens de préhension selon l'axe longitudinal (X),the longitudinal displacement means comprise means for gripping the rear end of the tube, and means for driving said gripping means along the longitudinal axis (X),
- chaque tête de cintrage comprend : deux galets de formage présentant chacun au moins une gorge périphérique de section semi- circulaire adaptée pour former, dans une position accolée desdits galets, un conduit de guidage présentant un col de diamètre sensiblement supérieur à celui du tube,each bending head comprises: two forming rollers each having at least one peripheral groove of semicircular section adapted to form, in an adjoining position of said rollers, a guide duct having a neck of diameter substantially greater than that of the tube,
. des moyens de déplacement relatif des galets de formage, aptes à positionner lesdits galets soit dans leur position accolée, soit dans une position dite d'ouverture, apte à permettre le passage du tube selon un axe perpendiculaire à l'axe (X),. means for relative displacement of the forming rollers, capable of positioning said rollers either in their adjoining position or in a so-called open position, capable of allowing the passage of the tube along an axis perpendicular to the axis (X),
. un doigt de pliage disposé en aval et à proximité des galets de formage,. a folding finger disposed downstream and near the forming rollers,
. des moyens de déplacement du doigt de pliage selon une trajectoire circulaire centrée sur un axe (Y) orthogonal à l'axe (X), des moyens de déplacement en translation du doigt de pliage selon un axe (Y-| ) parallèle à (Y), des organes de guidage du tube disposés de part et d'autre de l'axe (X) de façon à venir au contact dudit tube en amont et à proximité des galets de formage, lesdits organes de guidage étant adaptés pour s'escamoter transversalement sous l'effet d'un effort longitudinal exercé par les moyens de préhension. En premier lieu, une telle machine à cintrer est conçue pour permettre de cintrer des tubes prédécoupés dotés de systèmes de raccord à chacune de leurs extrémités. En effet, d'une part, les moyens de préhension sont adaptés pour assurer le maintien de l'extrémité arrière du tube munie de son système de raccord et d'autre part, la faculté "d'ouverture" des galets de guidage, permet d'enfiler le tube droit prédécoupé muni de ses systèmes de raccord, soit manuellement, soit au moyen d'un système de chargement. De plus, une telle machine à cintrer autorise la production de pièces de géométries complexes et variées puisqu'elle permet de réaliser :. means for moving the folding finger along a circular trajectory centered on an axis (Y) orthogonal to the axis (X), means for translating the folding finger along an axis (Y- |) parallel to (Y ), tube guide members arranged on either side of the axis (X) so as to come in contact with said tube upstream and near the forming rollers, said guide members being adapted to retract transversely under the effect of a longitudinal force exerted by the gripping means. Firstly, such a bending machine is designed to allow bending of precut tubes with connection systems at each of their ends. Indeed, on the one hand, the gripping means are adapted to ensure the maintenance of the rear end of the tube provided with its connection system and on the other hand, the "opening" faculty of the guide rollers, allows thread the pre-cut straight tube fitted with its connection systems, either manually or by means of a loading system. In addition, such a bending machine allows the production of parts of complex and varied geometries since it allows to realize:
- des cintrages par formage sur les galets en amenant le doigt de pliage à se déplacer selon sa trajectoire circulaire centrée sur l'axe (Y),- bending by forming on the rollers, causing the folding finger to move along its circular trajectory centered on the axis (Y),
- des rayons variables plus grands que les rayons des galets de formage, notamment en vue d'obtenir des spires, en disposant le doigt de pliage dans une position fixe le long de sa trajectoire circulaire, et en poussant le tube par l'intermédiaire des moyens d'entraînement en translation des moyens de préhension. Il est à noter, en outre, que lors de telles opérations de cintrage, les organes de guidage du tube disposés en amont des galets jouent un rôle primordial car en assurant le maintien de ce tube, ils évitent d'éventuelles déformations de la portion de tube s ' étendant entre les moyens de préhension et lesdits galets. De plus, le caractère escamotable de ces organes de guidage permet de déplacer les moyens de préhension jusqu'à ce que ces derniers viennent au contact des galets, et par conséquent, de procéder au cintrage de la quasi-totalité de la longueur des tubes .- variable radii larger than the radii of the forming rollers, in particular with a view to obtaining turns, by placing the folding finger in a fixed position along its circular path, and by pushing the tube through the means for translational drive of the gripping means. It should be noted, moreover, that during such bending operations, the tube guide members arranged upstream of the rollers play a vital role because by ensuring the maintenance of this tube, they avoid possible deformations of the portion of tube extending between the gripping means and said rollers. In addition, the retractable nature of these guide members makes it possible to move the gripping means until the latter come into contact with the rollers, and consequently, to proceed to bending almost the entire length of the tubes.
Par ailleurs, il est également capital de noter que le fait que le tube soit guidé à l'intérieur des gorges des galets de formage permet de maîtriser de façon convenable 1 ' ovalisation des tubes de faible diamètre lors des opérations de cintrage de ce dernier. La machine à cintrer selon 1 ' invention a également comme avantage de permettre de façon très aisée de cintrer les tubes dans les deux sens, les seules opérations à effectuer en vue du changement de cintrage consistant à combiner des déplacements en translation, et un déplacement selon sa trajectoire circulaire, du doigt de pliage. Ainsi, cette machine à cintrer autorise des cadences de pliage très élevées, et de plus du fait de sa conception simple (seul le doigt de pliage est amené à être déplacé) conduit à l'obtention d'une tête de cintrage de faible encombrement.In addition, it is also essential to note that the fact that the tube is guided inside the grooves of the forming rollers makes it possible to properly control the ovalization of the tubes of small diameter during the operations of bending the latter. The bending machine according to the invention also has the advantage of making it very easy to bend the tubes in both directions, the only operations to be carried out with a view to changing the bending consisting of combining translational displacements and a displacement according to its circular trajectory, with the folding finger. Thus, this bending machine allows very high bending rates, and moreover due to its simple design (only the bending finger is caused to be moved) leads to the production of a bending head of small bulk.
Selon une autre caractéristique de l'invention, les galets de formage comportent deux gorges superposées de sections adaptées pour former deux conduits de guidage présentant des cols de diamètres différents. De plus, des moyens de déplacement en translation des galets de formage respectivement selon un axe (Y2). (¥3) parallèle à (Y) sont adaptés pour positionner ces derniers de façon que l'une ou l'autre de leur gorge soit axée par rapport à l'axe longitudinal (X). Cette disposition autorise, sans nécessiter un quelconque réglage, de cintrer un tube présentant deux diamètres différents, tel que par exemple un tube dont certaines portions de longueur sont gainées, et/ou de cintrer un tube avec des rayons de cintrage différents. Selon une autre caractéristique de l'invention, la machine à cintrer comprend des moyens de déplacement en translation du doigt de pliage aptes à le déplacer radialement par rapport à l'axe (Y). Le fait de pouvoir déplacer le doigt de cintrage relativement aux galets de formage permet de faire varier la longueur des portions de tube droites entre deux opérations de cintrage, et notamment de réaliser des portions de tube droites de très faible longueur. La machine à cintrer comprend, en outre, préfèrentiellement, une réglette disposée en amont des galets de formage au contact de ceux-ci, et présentant une face d'appui formant support pour le tube, ladite réglette étant associée à des moyens de déplacement adaptés pour l'amener dans une position escamotée autorisant d'avancer les moyens de préhension au contact des galets de formage. Cette réglette a pour but d'assurer le maintien du tube immédiatement en amont des galets et donc permet d'obtenir le bon angle de cintrage. De plus, son caractère escamotable permet de déplacer les moyens de préhension jusqu'à ce que ces derniers viennent au contact des galets, où ils se substituent à ladite réglette pour assurer le maintien du tube. De plus, de façon avantageuse, cette réglette présente la forme d'un U, les moyens de déplacement de ladite réglette consistant en des moyens de pivotement aptes à la faire basculer autour d'un axe orthogonal aux axes (X) et (Y). Selon une autre caractéristique de l'invention, les moyens de déplacement relatif des galets de formage comprennent des moyens d'entraînement en rotation de chacun de ces galets autour des axes (Y2)' (Y3), lesdits galets présentant une forme non circulaire adaptée pour libérer un espace lors de leur rotation à partir de leur position accolée. Ce mode de déplacement relatif des galets a pour avantage de conduire à une optimisation de l'encombrement de la tête de cintrage car la translation desdits galets visant à utiliser l'une ou l'autre de leurs gorges, ainsi que leur déplacement relatif sont opérés autour d'axes uniques (Y2), (¥3)-According to another characteristic of the invention, the forming rollers comprise two superimposed grooves of sections adapted to form two guide conduits having necks of different diameters. In addition, means for translational movement of the forming rollers respectively along an axis (Y2). (¥ 3) parallel to (Y) are adapted to position the latter so that one or the other of their grooves is oriented relative to the longitudinal axis (X). This arrangement allows, without requiring any adjustment, to bend a tube having two different diameters, such as for example a tube of which certain portions of length are sheathed, and / or to bend a tube with different bending radii. According to another characteristic of the invention, the bending machine comprises means for translational movement of the folding finger able to move it radially relative to the axis (Y). The fact of being able to move the bending finger relative to the forming rollers makes it possible to vary the length of the straight tube portions between two bending operations, and in particular to produce straight tube portions of very short length. The bending machine further comprises, preferably, a strip arranged upstream of the forming rollers in contact with them, and having a bearing face forming a support for the tube, said strip being associated with suitable displacement means. to bring it into a retracted position allowing to advance the gripping means in contact with the forming rollers. The purpose of this strip is to ensure the maintenance of the tube immediately upstream of the rollers and therefore allows the right bending angle to be obtained. In addition, its retractable nature allows the gripping means to be moved until the latter come into contact with the rollers, where they replace said strip to maintain the tube. In addition, advantageously, this strip has the shape of a U, the means for moving said strip consisting of pivoting means able to tilt it around an axis orthogonal to the axes (X) and (Y) . According to another characteristic of the invention, the means for relative displacement of the forming rollers comprise means for driving each of these rollers in rotation around the axes (Y2) '(Y3), said rollers having a suitable non-circular shape to free up space when they rotate from their adjoining position. This mode of relative movement of the rollers has the advantage of leading to an optimization of the size of the bending head because the translation of said rollers aiming to use one or the other of their grooves, as well as their relative movement are operated around single axes (Y2), (¥ 3) -
De plus, il est possible, selon ce mode de réalisation, d'utiliser des galets de tailles différentes permettant de réaliser des cintrages de rayons différents et/ou des cintrages de tubes de diamètres différents. A cet effet, il suffit de réaliser ces galets de façon que leurs axes de rotation soient excentrés d'une valeur adéquate.In addition, it is possible, according to this embodiment, to use rollers of different sizes making it possible to produce bends of different radii and / or bends of tubes of different diameters. For this purpose, it suffices to produce these rollers so that their axes of rotation are offset by an adequate value.
Selon un mode de réalisation préférentiel, chaque galet de formage est monté sur un arbre s ' étendant respectivement selon l'axe ( 2). (γ3)/ les moyens d'entraînement en rotation desdits galets comportant deux pignons montés chacun sur un des arbres, une crémaillère dotée de deux faces latérales dentées agencées pour engrener chacune avec un pignon, et des moyens d'entraînement de la crémaillère selon un axe longitudinal (X-| ) parallèle à l'axe (X).According to a preferred embodiment, each forming roller is mounted on a shaft extending respectively along the axis (2). (Γ 3) / the drive means are in rotation said rollers comprising two pinions, each mounted on one of the shafts, a rack with two toothed lateral faces arranged to engage each with a pinion, and means for driving the rack along a longitudinal axis (X- |) parallel to the axis (X).
De plus, l'arbre de chaque galet est avantageusement constitué d'une tige d'un vérin agencé de façon à engendrer les déplacements en translation dudit galet respectivement selon l'axe (Y2), (γ3->-In addition, the shaft of each roller is advantageously constituted by a rod of a jack arranged so as to cause the translational displacements of said roller respectively along the axis (Y2), ( γ 3 -> -
Selon une autre caractéristique de l'invention, la machine à cintrer comprend un organe d'appui rétractable latéralement relativement à l'axe (X) agencé pour venir se positionner au contact d'une génératrice du tube diamétralement opposée à celle reposant sur la face d'appui de la réglette, en amont et à proximité des galets de formage. Cet organe d'appui a pour fonction, pour des machines à cintrer permettant de façon classique de faire tourner la tête de cintrage autour du tube en vue de réaliser des pliages multidirectionnels, d'assurer le maintien en position du tube lorsque, lors de l'ouverture des galets, la tête de cintrage est disposée de façon que ledit tube se trouve sous la réglette.According to another characteristic of the invention, the bending machine comprises a support member retractable laterally relative to the axis (X) arranged to come into contact with a generator of the tube diametrically opposite to that resting on the face support of the strip, upstream and near the forming rollers. This support member has the function, for bending machines which conventionally allow the bending head to rotate around the tube in order to perform multidirectional bends, to ensure that the tube is held in position when, during the opening of the rollers, the bending head is arranged so that said tube is located under the strip.
De plus, cet organe d'appui est avantageusement constitué d'un câble s ' étendant à l'intérieur d'une gaine, une des extrémités de ce câble étant solidarisée à une tige de vérin agencé pour amener ledit câble à coulisser à l'intérieur de ladite gaine, et l'autre extrémité de ce câble s ' étendant selon un plan orthogonal aux plans (X) et (Y) de façon à venir se positionner au contact du tube lors du déplacement du vérin.In addition, this support member advantageously consists of a cable extending inside a sheath, one end of this cable being secured to a jack rod arranged to cause said cable to slide to the inside said sheath, and the other end of this cable extending along a plane orthogonal to the planes (X) and (Y) so as to be positioned in contact with the tube during the displacement of the jack.
Selon une autre caractéristique de l'invention, la machine à cintrer comprend deux plaques d'appui présentant une face d'appui convexe, disposées orthogonalement par rapport à l'axe (X), de part et d'autre de ce dernier, en amont des galets de formage, lesdites plaques d'appui étant décalées par rapport auxdits galets de formage selon un axe parallèle à l'axe (Y), et disposées de façon que lors de la formation de spires, le tube soit amené après cintrage à se déplacer sur la face d'appui d'une des plaques d'appui.According to another characteristic of the invention, the bending machine comprises two support plates having a convex support face, arranged orthogonally to the axis (X), on either side of the latter, upstream of the forming rollers, said bearing plates being offset with respect to said forming rollers along an axis parallel to the axis ( Y), and arranged so that during the formation of turns, the tube is caused after bending to move on the bearing face of one of the bearing plates.
De telles plaques d'appui ont pour avantage de permettre de former des spires présentant un pas déterminé .Such support plates have the advantage of making it possible to form turns having a determined pitch.
De plus, de façon avantageuse, des moyens de réglage permettent de modifier la position des plaques d'appui le long d'un axe parallèle à l'axe (Y), et ainsi autorisent de modifier le pas des spires. Selon une autre caractéristique de l'invention, la machine à cintrer comprend :In addition, advantageously, adjustment means make it possible to modify the position of the support plates along an axis parallel to the axis (Y), and thus allow the pitch of the turns to be modified. According to another characteristic of the invention, the bending machine comprises:
- deux cellules de détection disposées symétriquement de part et d'autre de l'axe (X), en amont des galets de formage, de façon que, selon le sens de cintrage, le faisceau de l'une desdites cellules soit coupé par l'extrémité du tube lors de la formation de spires,- two detection cells arranged symmetrically on either side of the axis (X), upstream of the forming rollers, so that, according to the direction of bending, the beam of one of said cells is cut by l end of the tube during the formation of turns,
- des moyens de commande numérique programmés pour calculer la longueur développée pour la formation de chaque tour de spire, comparer cette valeur avec une valeur mémorisée représentative de la longueur développée théorique nécessaire pour la formation d'un tour de spire, et commander, en fonction du résultat de cette comparaison, un déplacement du doigt de pliage le long de sa trajectoire circulaire en vue de la formation du tour de spire suivant, de façon que la longueur totale développée pour la formation d'une spire soit rigoureusement toujours la même pour une série de produits identiques.- digital control means programmed to calculate the length developed for the formation of each turn, compare this value with a memorized value representative of the theoretical developed length necessary for the formation of a turn, and control, as a function of the result of this comparison, a displacement of the folding finger along its circular trajectory with a view to the formation of the next turn of the turn, so that the total length developed for the formation of a turn is strictly the same for a series of identical products.
Ces dispositions permettent, lors de la production d'une série de produits identiques, de consommer une longueur développée fixe pour la formation des spires, et ainsi de former des produits dont les angles des brins d'entrée et de sortie des spires sont toujours identiques.These provisions allow, during the production of a series of identical products, to consume a fixed developed length for the formation of turns, and thus to form products whose angles of the input and output strands of the turns are always identical. .
Par ailleurs, les organes de guidage du tube sont préférentiellement disposés chacun sur l'extrémité d'un bras monté pivotant par rapport au bâti et associé à des moyens élastiques aptes à le maintenir dans une position inclinée vers l'arrière par rapport au sens de déplacement dudit tube.Furthermore, the guide members of the tubes are preferably each arranged on the end of an arm pivotally mounted relative to the frame and associated with elastic means capable of holding it in a position inclined towards the rear relative to the direction of movement of said tube.
Cette conception permet d'obtenir un autoblocage des organes de guidage lors du déplacement du tube, tout en autorisant l'escamotage, par pivotement, de ces derniers sous l'effet de l'effort exercé par les moyens de préhension.This design provides self-locking of the guide members during the displacement of the tube, while allowing the retraction, by pivoting, of the latter under the effect of the force exerted by the gripping means.
L'invention s'étend à une tête de cintrage comprenant :The invention extends to a bending head comprising:
- deux galets de formage présentant chacun au moins une gorge périphérique de section semi-circulaire adaptée pour former, dans une position accolée desdits galets, un conduit de guidage axé selon un axe (X), présentant un col de diamètre sensiblement supérieur à celui du tube,- two forming rollers each having at least one peripheral groove of semicircular section adapted to form, in an adjoining position of said rollers, a guide duct oriented along an axis (X), having a neck of diameter substantially greater than that of the tube,
- des moyens de déplacement relatif des galets de formage, aptes à positionner lesdits galets soit dans leur position accolée, soit dans une position dite d'ouverture, apte à permettre le passage du tube selon un axe perpendiculaire à l'axe (X),means for relative displacement of the forming rollers, capable of positioning said rollers either in their adjoining position, or in a so-called open position, capable of allowing the passage of the tube along an axis perpendicular to the axis (X),
- un doigt de pliage disposé en aval et à proximité des galets de formage,- a folding finger disposed downstream and near the forming rollers,
- des moyens de déplacement du doigt de pliage selon une trajectoire circulaire centrée sur un axe (Y) orthogonal à l'axe (X),means for moving the folding finger along a circular trajectory centered on an axis (Y) orthogonal to the axis (X),
- des moyens de déplacement en translation du doigt de pliage selon un axe (Y-|) parallèle à (Y),means for translational movement of the folding finger along an axis (Y- | ) parallel to (Y),
- des organes de guidage du tube disposés de part et d'autre de l'axe (X) de façon à venir au contact dudit tube en amont et à proximité des galets de formage, lesdits organes de guidage étant adaptés pour s'escamoter transversalement sous l'effet d'un effort longitudinal exercé par les moyens de préhension.- tube guide members arranged on either side of the axis (X) so as to come into contact with said tube upstream and near the forming rollers, said guide members being adapted to retract transversely under the effect of a longitudinal force exerted by the gripping means.
Elle vise également une tête de cintrage présentant 1 ' une quelconque des caractéristiques ci-dessus énoncées .It also relates to a bending head having one of any of the above characteristics set out.
D'autres caractéristiques, buts et avantages de l'invention ressortiront de la description détaillée qui suit en référence aux dessins annexés qui en représentent à titre d'exemple non limitatif un mode de réalisation préférentiel. Sur ces dessins qui font partie intégrante de la présente description :Other characteristics, objects and advantages of the invention will emerge from the detailed description which follows, with reference to the appended drawings which represent, by way of non-limiting example, a preferred embodiment. On these drawings which form an integral part of this description:
- la figure 1 est une vue latérale, partiellement en coupe longitudinale, par un plan axial, d'une machine à cintrer conforme à l'invention,FIG. 1 is a side view, partially in longitudinal section, through an axial plane, of a bending machine according to the invention,
- la figure 2 est une vue de dessus de cette machine à cintrer,FIG. 2 is a top view of this bending machine,
- la figure 3 en est une coupe transversale par un plan vertical A, - la figure 4 est une coupe longitudinale partielle par un plan B, à échelle agrandie, des moyens de guidage escamotables de cette machine à cintrer,FIG. 3 is a cross section through a vertical plane A, FIG. 4 is a partial longitudinal section through a plane B, on an enlarged scale, of the retractable guide means of this bending machine,
- et la figure 5 est une vue schématique en perspective de cette machine à cintrer lors de la réalisation de spires.- And Figure 5 is a schematic perspective view of this bending machine during the production of turns.
La machine à cintrer représentée à titre d'exemple aux figures 1 à 3 est adaptée pour assurer le cintrage de tubes 1 de faible diamètre, tels que par exemple d'un diamètre de 4,75 mm, prédécoupés à une longueur prédéterminée, et dotés de raccords 2, 3 à chacune de leurs extrémités.The bending machine shown by way of example in FIGS. 1 to 3 is suitable for bending tubes 1 of small diameter, such as for example with a diameter of 4.75 mm, precut to a predetermined length, and provided of fittings 2, 3 at each of their ends.
Cette machine à cintrer comprend, en premier lieu, un bâti 4 sur lequel est montée une tête de cintrage décrite ci-dessous, et une pince 5 apte à enserrer l'extrémité arrière du tube 1 en aval du raccord 3, ladite pince étant logée à l'intérieur d'un conduit cylindrique 6 et associée à des moyens d'entraînement classiques (non représentés) aptes à la déplacer longitudinalement selon un axe (X) relativement au bâti 4. En outre, cette machine à cintrer peut être dotée, soit de moyens d'entraînement en rotation de la pince 5 autour de l'axe (X), soit de moyens d'entraînement en rotation du bâti 4 autour de la pince 5, et ce dans le but de réaliser des pliages multidirectionnels . Les têtes de cintrage ci-dessous décrites peuvent également équiper une machine à cintrer telle que décrite dans le brevet FR 2 554 021. A des fins de simplification, la machine à cintrer sera toutefois décrite ci-dessous dans une position fixe telle que représentée aux figures permettant de cintrer le tube 1 soit à droite, soit à gauche, par formage dans un plan horizontal, et de réaliser des spires à axe de révolution vertical.This bending machine comprises, first of all, a frame 4 on which is mounted a bending head described below, and a clamp 5 capable of enclosing the rear end of the tube 1 downstream of the connector 3, said clamp being housed inside a cylindrical duct 6 and associated with conventional drive means (not shown) able to move it longitudinally along an axis (X) relative to the frame 4. In addition, this bending machine can be provided, either means for driving the clamp 5 in rotation about the axis (X), or means for driving the frame 4 in rotation around the clamp 5, and this in the goal of making multidirectional bends. The bending heads described below can also be fitted to a bending machine as described in patent FR 2,554,021. For the sake of simplification, the bending machine will however be described below in a fixed position as shown in FIGS. figures allowing the tube 1 to be bent either to the right or to the left, by forming in a horizontal plane, and to make turns with a vertical axis of revolution.
En premier lieu, la tête de cintrage comporte deux galets de formage 7, 8 de forme générale semi-circulaire (telle que représentée aux figures) ou semi-elliptique, dotés chacun de deux gorges superposées 9, 10, de sections semi-circulaires, permettant de guider des tubes de diamètres différents, tels que par exemple un tube 1 de diamètre donné et le même tube 1 recouvert d'une gaine .Firstly, the bending head comprises two forming rollers 7, 8 of generally semi-circular shape (as shown in the figures) or semi-elliptical, each provided with two superimposed grooves 9, 10, of semi-circular sections, for guiding tubes of different diameters, such as for example a tube 1 of given diameter and the same tube 1 covered with a sheath.
Chacun de ces galets de formage 7, 8 est monté sur l'extrémité supérieure d'un arbre de rotation vertical 12, 13 auquel il est solidarisé au moyen d'une vis 11 , chacun desdits arbres étant logé et monté rotatif à l'intérieur d'alésages ménagés dans un boîtier 14.Each of these forming rollers 7, 8 is mounted on the upper end of a vertical rotation shaft 12, 13 to which it is secured by means of a screw 11, each of said shafts being housed and mounted to rotate inside bores in a housing 14.
Les moyens d'entraînement en rotation de ces arbres 12, 13 autour de leur axe de révolution respectif (Y2). (γ3) comprennent, pour chacun desdits arbres, un pignon 15, 16 monté autour et solidaire de ce dernier. Ils comprennent, également, une crémaillère 17 s ' étendant horizontalement et dotée de deux faces latérales dentées agencées pour engrener chacune avec un des pignons 15, 16.The means for driving these shafts 12, 13 in rotation about their respective axis of revolution (Y2) . ( γ 3) comprise, for each of said shafts, a pinion 15, 16 mounted around and integral with the latter. They also include a rack 17 extending horizontally and provided with two toothed lateral faces arranged to mesh each with one of the pinions 15, 16.
Les moyens d'entraînement en rotation des arbres 12, 13 comprennent, enfin, un vérin 70 agencé horizontalement, dont le corps est solidaire du bâti 4, et dont la tige est solidarisée à la crémaillère 17 de façon à engendrer les déplacements de cette dernière selon un axe horizontal (X-) ) .The means for rotating the shafts 12, 13 finally comprise a jack 70 arranged horizontally, the body of which is secured to the frame 4, and the rod of which is secured to the rack 17 so as to cause the displacements of the latter. along a horizontal axis (X-)).
De tels moyens d'entraînement en rotation permettent de faire pivoter les galets de formage 7, 8 d ' un angle de 90 degrés entre :Such rotational drive means are used to rotate the forming rollers 7, 8 by an angle of 90 degrees between:
- une position accolée desdits galets, représentée aux figures, où ces derniers assurent le guidage du tube 1 ,- an adjoining position of said rollers, shown in the figures, where these guide the tube 1,
- et une position "d'ouverture" desdits galets (représentée en pointillé à la figure 2), où les faces planes tronquées de ces derniers se trouvent en vis- à-vis, permettant notamment la mise en place et le déchargement du tube 1.- And an "open" position of said rollers (shown in dotted lines in FIG. 2), where the truncated flat faces of the latter are opposite, allowing in particular the positioning and unloading of the tube 1 .
Il est à noter, en outre, que ces moyens d'entraînement en rotation des arbres 12, 13, et donc des galets de formage 7, 8 permettent d'utiliser des galets de taille supérieure à ceux représentés aux figures en vue d'obtenir des rayons de formage différents. A cet effet, il suffit simplement que l'axe de rotation de ces galets soit excentré de façon adéquate par rapport à 1 ' axe de symétrie de ces derniers .It should be noted, moreover, that these means for driving the shafts 12, 13 in rotation, and therefore the forming rollers 7, 8 make it possible to use rollers of size larger than those shown in the figures in order to obtain different forming radii. To this end, it suffices simply that the axis of rotation of these rollers is adequately eccentric with respect to the axis of symmetry of the latter.
Les galets de formage 7, 8 sont également associés à des moyens d'entraînement en translation respectivement selon les axes (Y2). (Y3). aptes à amener, soit l'une, soit l'autre gorge 9, 10 dans l'axe du plan de déplacement du tube 1.The forming rollers 7, 8 are also associated with drive means in translation respectively along the axes (Y2). (Y3). able to bring either one or the other groove 9, 10 in the axis of the plane of movement of the tube 1.
Ces moyens d'entraînement en translation comprennent, pour chaque arbre 12, 13, un piston 18, 19 solidarisé sous l'extrémité inférieure dudit arbre au moyen d'une vis telle que 20, chacun desdits pistons s ' étendant dans une chambre de vérin 21 , 22 ménagée dans le boîtier 14, et dotée classiquement d'entrées de fluides aptes à permettre d'engendrer les déplacements des pistons.These translational drive means comprise, for each shaft 12, 13, a piston 18, 19 secured under the lower end of said shaft by means of a screw such as 20, each of said pistons extending in a jack chamber 21, 22 formed in the housing 14, and conventionally provided with fluid inlets capable of allowing the displacements of the pistons to be generated.
La tête de cintrage comprend également un doigt de pliage 23 consistant en un galet de forme cylindrique disposé en aval des galets de formage 7, 8 et associé à : - des moyens de déplacement dudit doigt de pliage selon une trajectoire circulaire centrée sur un axe (y) coplanaire avec les axes ( 2). (Y3)/ et perpendiculaire à l'axe (X) , - des moyens de déplacement en translation dudit doigt de pliage selon un axe (Y-| ) parallèle à (Y),The bending head also comprises a folding finger 23 consisting of a cylindrical roller disposed downstream of the forming rollers 7, 8 and associated with: - means for moving said folding finger along a circular path centered on an axis ( y) coplanar with the axes (2). (Y3) / and perpendicular to the axis (X), means for translational movement of said folding finger along an axis (Y- |) parallel to (Y),
- et des moyens de déplacement en translation dudit doigt de pliage selon des axes radiaux par rapport à l'axe (Y).- And means for translational movement of said folding finger along radial axes relative to the axis (Y).
A cet effet, la machine à cintrer comprend, en premier lieu, un bloc rotatif 24 solidaire d'un arbre moteur 25 s ' étendant selon l'axe (Y) et situé sous le boîtier 14, ledit arbre étant monté rotatif par rapport au bâti 4 par l'intermédiaire de roulements tels que 26, et étant entraîné en rotation par un moto-réducteur 27 coaxial avec ce dernier.To this end, the bending machine comprises, first of all, a rotary block 24 integral with a motor shaft 25 extending along the axis (Y) and located under the housing 14, said shaft being rotatably mounted relative to the frame 4 by means of bearings such as 26, and being driven in rotation by a gear motor 27 coaxial with the latter.
En vue des déplacements du doigt de pliage 23 selon l'axe (Y-|), la machine à cintrer comporte un premier chariot 28 monté sur le bloc rotatif 24 par l'intermédiaire d'un système de guidage en translation 29 en forme de queue d'aronde, et solidarisé à la tige d'un vérin 30 agencé verticalement, dont le corps est porté par une platine horizontale 31 fixée au bloc rotatif 24. Enfin, en vue des déplacements du doigt de pliage 23 selon des axes radiaux par rapport à l'axe (Y), la machine à cintrer comporte un deuxième chariot 32 monté sur le premier chariot 28 par l'intermédiaire d'un système de guidage en forme de queue d'aronde, et solidarisé à la tige d'un vérin 33 agencé horizontalement, dont le corps est porté par le premier chariot 28.In view of the movements of the folding finger 23 along the axis (Y- |), the bending machine comprises a first carriage 28 mounted on the rotary block 24 by means of a translational guidance system 29 in the form of dovetail, and secured to the rod of a jack 30 arranged vertically, the body of which is carried by a horizontal plate 31 fixed to the rotary block 24. Finally, with a view to displacements of the folding finger 23 along radial axes by relative to the axis (Y), the bending machine comprises a second carriage 32 mounted on the first carriage 28 by means of a guide system in the form of a dovetail, and secured to the rod of a jack 33 arranged horizontally, the body of which is carried by the first carriage 28.
Le doigt de pliage 23 est quant à lui porté par ce deuxième chariot 32 et se trouve disposé au droit de l'extrémité d'un bras incliné 34 s ' étendant au-dessus dudit deuxième chariot en direction des galets de formage 7,8.The folding finger 23 is for its part carried by this second carriage 32 and is arranged in line with the end of an inclined arm 34 extending above said second carriage in the direction of the forming rollers 7,8.
La machine à cintrer comporte, par ailleurs, des premier et second moyens de guidage du tube 1 agencés pour éviter toute déformation dudit tube en amont des galets de formage 7, 8. Les premiers moyens de guidage consistent en une réglette 35 disposée immédiatement en amont des galets de formage 7, 8 et présentant une face d'appui formant support pour le tube 1. Cette réglette 35 consiste en un cavalier en forme de U axé sur l'axe (X), et est montée sur une pièce 36 porte-réglette articulée par rapport au bâti 4 autour d'un axe horizontal orthogonal à l'axe (X), de façon à permettre d'escamoter la réglette 35 par pivotement de cette dernière, et d'amener la pince 6 au contact des galets de formage 7, 8.The bending machine further comprises first and second tube guide means 1 arranged to prevent any deformation of said tube upstream of the forming rollers 7, 8. The first guide means consist of a strip 35 disposed immediately upstream forming rollers 7, 8 and having a bearing face forming a support for the tube 1. This strip 35 consists in a U-shaped jumper centered on the axis (X), and is mounted on a piece 36 strip holder articulated relative to the frame 4 around a horizontal axis orthogonal to the axis (X), so as to allow the strip 35 to be retracted by pivoting the latter, and to bring the clamp 6 into contact with the forming rollers 7, 8.
Les moyens de pivotement de cette réglette 35 consistent, quant à eux, en un vérin 37 s ' étendant selon un axe incliné sensiblement de 45° par rapport à l'axe (X), dont la tige est articulée sur ladite réglette, et dont le corps est articulé à l'intérieur d'une chape 38 solidaire du bâti 4.The pivoting means of this strip 35 consist, in turn, of a cylinder 37 extending along an axis inclined substantially 45 ° relative to the axis (X), the rod of which is articulated on said strip, and whose the body is articulated inside a yoke 38 secured to the frame 4.
Les deuxièmes moyens de guidage comprennent, tel que représenté à la figure 4, deux roulettes 39, 40 portées chacune par un bras tel que 50 s ' étendant au travers d'une lumière ménagée dans le conduit 6 de guidage de la pince 5, lesdits bras étant montés pivotants, chacun sur une patte telle que 41 solidaire d'une bride 51 montée sur le conduit 6. De plus, des ressorts à spirale tels que 52 disposés autour de l'arbre de rotation des bras 50 et solidaires des pattes 41 et desdits bras, sont adaptés pour maintenir ces derniers, en l'absence de sollicitation, dans une position où ils sont inclinés vers l'arrière par rapport au sens de déplacement du tube 1.The second guide means comprise, as shown in Figure 4, two rollers 39, 40 each carried by an arm such as 50 extending through a lumen formed in the conduit 6 for guiding the clamp 5, said arms being pivotally mounted, each on a lug such as 41 secured to a flange 51 mounted on the duct 6. In addition, spiral springs such as 52 arranged around the rotation shaft of the arms 50 and secured to the lugs 41 and of said arms, are adapted to maintain the latter, in the absence of stress, in a position where they are inclined rearward relative to the direction of movement of the tube 1.
Ainsi, les roulettes 39, 40 assurent le maintien et le guidage du tube 1 lors du déplacement longitudinal de ce dernier, mais s'escamotent transversalement sous l'effet de la pression exercée par la pince 5 lorsque cette dernière provient au contact desdites roulettes .Thus, the rollers 39, 40 maintain and guide the tube 1 during the longitudinal displacement of the latter, but retract transversely under the effect of the pressure exerted by the clamp 5 when the latter comes into contact with said rollers.
La machine à cintrer comporte, par ailleurs, un organe d'appui adapté pour assurer le support du tube 1 lorsque le bâti 4 est pivoté de 180° par rapport à la position représentée aux figures, et lors de "l'ouverture" des galets de formage 7, 8.The bending machine further comprises a support member adapted to provide support for the tube 1 when the frame 4 is pivoted by 180 ° relative to the position shown in the figures, and when the rollers are "opened" 7, 8.
Cet organe d'appui consiste en un câble 53 s ' étendant à l'intérieur d'une gaine 54, une des extrémités de ce câble étant solidarisée à la tige d'un vérin 55 agencé pour amener ledit câble à coulisser à l'intérieur de ladite gaine, et l'autre extrémité étant disposée de façon à venir se positionner transversalement sous le tube 1 (dans la position précitée du bâti 4) lors du déploiement du vérin 55.This support member consists of a cable 53 extending inside a sheath 54, one of the ends of this cable being secured to the rod of a jack 55 arranged to cause said cable to slide inside said sheath, and the other end being arranged so as to come to be positioned transversely under the tube 1 (in the position above of the frame 4) during the deployment of the jack 55.
La machine à cintrer comporte, en outre, deux plaques d'appui 56, 57 destinées à permettre de déterminer le pas des spires lors de la formation de ces dernières.The bending machine further comprises two support plates 56, 57 intended to enable the pitch of the turns to be determined during the formation of the latter.
A cet effet, ces deux plaques d'appui 56, 57 consistent en deux plaques courbes présentant une face supérieure convexe, disposées orthogonalement par rapport à l'axe (X) de part et d'autre de ce dernier, en amont des galets de formage 7, 8 et décalées vers le haut par rapport audit axe (X) .To this end, these two support plates 56, 57 consist of two curved plates having a convex upper face, arranged orthogonally to the axis (X) on either side of the latter, upstream of the rollers of forming 7, 8 and offset upwards relative to said axis (X).
De plus, ces plaques d'appui 56, 57 sont portées par des pattes verticales telles que 59 percées d'un trou oblong à grand axe vertical et solidarisées au bâti 4 au moyen de vis telle que 60 permettant de régler la position en hauteur desdites plaques d'appui et donc de modifier le pas des spires.In addition, these support plates 56, 57 are carried by vertical lugs such as 59 pierced with an oblong hole with a large vertical axis and secured to the frame 4 by means of screws such as 60 for adjusting the height position of said support plates and therefore to modify the pitch of the turns.
Tel que représenté à la figure 5, lors de la formation de spires, le tube 1 est amené à se déplacer sur la face supérieure d'une des plaques d'appui 56, 57 qui détermine donc le pas de cette spire, ajustable selon la position en hauteur de cette dernière.As shown in Figure 5, during the formation of turns, the tube 1 is caused to move on the upper face of one of the support plates 56, 57 which therefore determines the pitch of this turn, adjustable according to the position in height of the latter.
La machine à cintrer comprend, enfin, deux cellules 61, 62 disposées en amont des plaques d'appui 56, 57 symétriquement de part et d'autre de l'axe (X) de façon que le faisceau d'une desdites cellules soit coupé par le brin d'extrémité du tube 1 lors de la formation de spires.The bending machine finally comprises two cells 61, 62 arranged upstream of the support plates 56, 57 symmetrically on either side of the axis (X) so that the beam of one of said cells is cut by the end strand of the tube 1 during the formation of turns.
Ces deux cellules 61 , 62 associées à une machine à cintrer à commande numérique, ont pour but de permettre, lors de la réalisation d'une série de produits identiques, de consommer une longueur développée fixe pour la formation des spires, et de former des spires dont l'angle du brin de sortie et l'angle du brin d'entrée sont toujours identiques.These two cells 61, 62 associated with a numerically controlled bending machine, are intended to allow, during the production of a series of identical products, to consume a fixed developed length for the formation of turns, and to form turns whose angle of the output strand and the angle of the input strand are always the same.
A cet effet, la machine à cintrer est programmée, lors de chaque tour de spire, pour :To this end, the bending machine is programmed, during each turn of the turn, to:
- mesurer la longueur développée pour la formation de ce tour grâce à la détection du brin d'extrémité du tube 1,- measure the length developed for the formation of this turn thanks to the detection of the end strand of the tube 1,
- calculer à partir de cette longueur développée, le rayon de ce tour de spire,- calculate from this developed length, the radius of this turn,
- corriger, lorsque ce rayon diffère du rayon théorique prédéterminé, le rayon du tour de spire suivant en commandant un déplacement du doigt de pliage 23 par actionnement du motoréducteur 27,correcting, when this radius differs from the predetermined theoretical radius, the radius of the next turn by controlling a movement of the folding finger 23 by actuation of the geared motor 27,
- le tout de façon que la longueur développée pour la formation de la spire soit rigoureusement toujours la même, moyennant la réalisation acceptable d'une spire présentant des rayons légèrement différents . - All so that the length developed for the formation of the turn is strictly the same, provided that an acceptable turn having slightly different radii is achieved.

Claims

REVENDICATIONS
1 / - Machine à cintrer des tubes ( 1 ) de petits diamètres, notamment inférieurs à 10 mm, prédécoupés de façon à présenter une longueur prédéterminée et dotés de systèmes de raccords (2, 3) à chacune de leurs extrémités, ladite machine à cintrer comprenant un bâti (4) sur lequel est montée au moins une tête de cintrage (7, 8, 23), et des moyens (5) de déplacement longitudinal du tube (1) relativement au bâti (4) selon un axe (X), et étant caractérisée en ce que :1 / - Machine for bending tubes (1) of small diameters, in particular less than 10 mm, precut so as to have a predetermined length and provided with connection systems (2, 3) at each of their ends, said bending machine comprising a frame (4) on which is mounted at least one bending head (7, 8, 23), and means (5) for longitudinal displacement of the tube (1) relative to the frame (4) along an axis (X) , and being characterized in that:
- les moyens de déplacement longitudinal comprennent des moyens de préhension (5) de l'extrémité arrière du tube (1), et des moyens d'entraînement desdits moyens de préhension selon l'axe longitudinal (X), - chaque tête de cintrage comprend : deux galets de formage (7, 8) présentant chacun au moins une gorge périphérique (9, 10) de section semi-circulaire adaptée pour former, dans une position accolée desdits galets, un conduit de guidage présentant un col de diamètre sensiblement supérieur à celui du tube ( 1 ) , des moyens (12-17) de déplacement relatif des galets de formage (7, 8), aptes à positionner lesdits galets soit dans leur position accolée, soit dans une position dite d'ouverture, apte à permettre le passage du tube (1) selon un axe perpendiculaire à l'axe (X), un doigt de pliage (23) disposé en aval et à proximité des galets de formage (7, 8),- the means for longitudinal displacement comprise means for gripping (5) the rear end of the tube (1), and means for driving said means for gripping along the longitudinal axis (X), - each bending head comprises : two forming rollers (7, 8) each having at least one peripheral groove (9, 10) of semi-circular section adapted to form, in an adjoining position of said rollers, a guide duct having a neck of diameter substantially greater than that of the tube (1), means (12-17) for relative displacement of the forming rollers (7, 8), capable of positioning said rollers either in their adjoining position, or in a so-called open position, capable of allowing the passage of the tube (1) along an axis perpendicular to the axis (X), a folding finger (23) disposed downstream and close to the forming rollers (7, 8),
. des moyens (24-27) de déplacement du doigt de pliage (23) selon une trajectoire circulaire centrée sur un axe (Y) orthogonal à l'axe (X), des moyens (30) de déplacement en translation du doigt de pliage (23) selon un axe (Y-| ) parallèle à (Y) , . des organes (39, 40) de guidage du tube (1) disposés de part et d'autre de l'axe (X) de façon à venir au contact dudit tube en amont et à proximité des galets de formage (7, 8), lesdits organes de guidage étant adaptés pour s'escamoter transversalement sous l'effet d'un effort longitudinal exercé par les moyens de préhension (5).. means (24-27) for moving the folding finger (23) along a circular path centered on an axis (Y) orthogonal to the axis (X), means (30) for translational movement of the folding finger ( 23) along an axis (Y- | ) parallel to (Y),. members (39, 40) for guiding the tube (1) arranged on either side of the axis (X) so as to come into contact with said tube upstream and near the forming rollers (7, 8) , said guide members being adapted to retract transversely under the effect of a longitudinal force exerted by the gripping means (5).
2/ - Machine à cintrer selon la revendication 1 , caractérisée en ce que :2 / - Bending machine according to claim 1, characterized in that:
- les galets de formage (7, 8) comportent deux gorges superposées (9, 10) de sections adaptées pour former deux conduits de guidage présentant des cols de diamètres différents, - des moyens (18, 19) de déplacement en translation des galets de formage (7, 8) selon un axe (Y2). (Y3) parallèle à (Y) sont adaptés pour positionner ces derniers de façon que l'une ou l'autre de leur gorge (9, 10) soit axée par rapport à l'axe longitudinal (X). 3/ - Machine à cintrer selon l'une des revendications 1 ou 2 , caractérisée en ce qu'elle comprend des moyens (33) de déplacement en translation du doigt de pliage (23) aptes à le déplacer radialement par rapport à l'axe (Y). 4/ - Machine à cintrer selon l'une des revendications précédentes, caractérisée en ce qu'elle comprend une réglette (35) disposée en amont des galets de formage (7, 8) au contact de ceux-ci, et présentant une face d'appui formant support pour le tube (1), ladite réglette étant associée à des moyens de déplacement (37) adaptés pour l'amener dans une position escamotée autorisant d'avancer les moyens de préhension (5) au contact des galets de formage (7, 8).- the forming rollers (7, 8) comprise two superimposed grooves (9, 10) of sections adapted to form two guide conduits having necks of different diameters, - means (18, 19) for translational movement of the rollers forming (7, 8) along an axis (Y2) . (Y3) parallel to (Y) are adapted to position the latter so that one or the other of their groove (9, 10) is oriented relative to the longitudinal axis (X). 3 / - Bending machine according to one of claims 1 or 2, characterized in that it comprises means (33) for translational movement of the folding finger (23) able to move it radially relative to the axis (Y). 4 / - Bending machine according to one of the preceding claims, characterized in that it comprises a strip (35) disposed upstream of the forming rollers (7, 8) in contact with them, and having a face d support forming a support for the tube (1), said strip being associated with displacement means (37) adapted to bring it into a retracted position allowing the gripping means (5) to advance in contact with the forming rollers ( 7, 8).
5/ - Machine à cintrer selon la revendication 4, caractérisée en ce que la réglette (35) présente la forme d'un U, les moyens de déplacement de ladite réglette consistant en des moyens de pivotement (37) aptes à la faire basculer autour d'un axe orthogonal aux axes (X) et (Y). 6/ - Machine à cintrer selon la revendication 2, caractérisée en ce que les moyens de déplacement relatif des galets de formage (7, 8) comprennent des moyens (12-17) d'entraînement en rotation de chacun de ces galets autour des axes (Y2). (Y3). lesdits galets présentant une forme non circulaire adaptée pour libérer un espace lors de leur rotation à partir de leur position accolée. 11 - Machine à cintrer selon la revendication 6, caractérisée en ce que chaque galet de formage (7, 8) présente une forme générale semi-circulaire ou semi-elliptique.5 / - Bending machine according to claim 4, characterized in that the strip (35) has the shape of a U, the means for moving said strip consisting of pivoting means (37) capable of tilting it around from an axis orthogonal to the axes (X) and (Y). 6 / - Bending machine according to claim 2, characterized in that the means for relative displacement of the forming rollers (7, 8) comprise means (12-17) for driving in rotation of each of these rollers around the axes (Y2). (Y3). said rollers having a non-circular shape adapted to release a space during their rotation from their adjoining position. 11 - Bending machine according to claim 6, characterized in that each forming roller (7, 8) has a generally semi-circular or semi-elliptical shape.
8/ - Machine à cintrer selon l'une des revendications 6 ou 7 , caractérisée en ce que chaque galet de formage (7, 8) est monté sur un arbre (12, 13) s ' étendant respectivement selon l'axe (Y2 (Y3), les moyens d'entraînement en rotation desdits galets comportant deux pignons (15, 16) montés chacun sur un des arbres (12, 13), une crémaillère (17) dotée de deux faces latérales dentées agencées pour engrener chacune avec un pignon (15, 16), et des moyens (70) d'entraînement de la crémaillère (17) selon un axe longitudinal (X-]) parallèle à l'axe (X).8 / - Bending machine according to one of claims 6 or 7, characterized in that each forming roller (7, 8) is mounted on a shaft (12, 13) extending respectively along the axis (Y2 ( Y3), the drive means are in rotation said rollers comprising two pinions (15, 16) each mounted on one of the shafts (12, 13), a rack (17) having two toothed lateral faces arranged to engage each with a pinion (15, 16), and means (70) for driving the rack (17) along a longitudinal axis (X- ] ) parallel to the axis (X).
9/ - Machine à cintrer selon les revendications 2 et 8 prises ensemble, caractérisée en ce que l'arbre (12, 13) de chaque galet de formage (7, 8) est constitué d'une tige d'un vérin (18, 19, 21, 22) agencé de façon à engendrer les déplacements en translation dudit galet respectivement selon l'axe (Y2-1, (γ3->- 10/ - Machine à cintrer selon l'une des revendications précédentes, caractérisée en ce qu'elle comprend un organe d'appui (53) rétractable latéralement relativement à l'axe (X) agencé pour venir se positionner au contact d'une génératrice du tube (1) diamétralement opposée à celle reposant sur la face d'appui de la réglette (35), en amont et à proximité des galets de formage (7, 8).9 / - Bending machine according to claims 2 and 8 taken together, characterized in that the shaft (12, 13) of each forming roller (7, 8) consists of a rod of a jack (18, 19, 21, 22) arranged so as to generate the translational displacements of said roller respectively along the axis (Y2- 1 , ( γ 3 -> - 10 / - Bending machine according to one of the preceding claims, characterized in that that it comprises a support member (53) retractable laterally relative to the axis (X) arranged to come into position in contact with a generator of the tube (1) diametrically opposite to that resting on the support face of the strip (35), upstream and near the forming rollers (7, 8).
11/ - Machine à cintrer selon la revendication 10, caractérisée en ce que l'organe d'appui est constitué d'un câble (53) s ' étendant à l'intérieur d'une gaine (54), une des extrémités de ce câble (53) étant solidarisée à une tige de vérin (55) agencé pour amener ledit câble à coulisser à l'intérieur de ladite gaine, et l'autre extrémité de ce câble (53) s ' étendant selon un plan orthogonal aux plans (X) et (Y) de façon à venir se positionner au contact du tube (1) lors du déplacement du vérin ( 55 ) .11 / - Bending machine according to claim 10, characterized in that the support member consists of a cable (53) extending inside a sheath (54), one of the ends of this cable (53) being secured to a jack rod (55) arranged to cause said cable to slide inside said sheath, and the other end of this cable (53) extending along a plane orthogonal to the planes (X) and (Y) so as to be positioned in contact with the tube (1) during the displacement of the jack (55).
12/ - Machine à cintrer selon l'une des revendications précédentes, caractérisée en ce qu'elle comporte deux plaques d'appui (56, 57) présentant une face d'appui convexe, disposées orthogonalement par rapport à l'axe (X), de part et d'autre de ce dernier, en amont des galets de formage (7, 8), lesdites plaques d'appui étant décalées par rapport auxdits galets de formage selon un axe parallèle à l'axe (Y), et disposées de façon que lors de la formation de spires, le tube (1) soit amené après cintrage à se déplacer sur la face d'appui d'une des plaques d'appui (56, 57). 13/ - Machine à cintrer selon la revendication 12, caractérisée en ce qu'elle comprend des moyens de réglage de la position des plaques d'appui (56, 57) le long d'un axe parallèle à l'axe (Y).12 / - Bending machine according to one of the preceding claims, characterized in that it comprises two support plates (56, 57) having a convex support face, arranged orthogonally to the axis (X) , on either side of the latter, upstream of the forming rollers (7, 8), said bearing plates being offset with respect to said forming rollers along an axis parallel to the axis (Y), and arranged so that during the formation of turns, the tube (1) is caused after bending to move on the support face of one of the support plates (56, 57). 13 / - Bending machine according to claim 12, characterized in that it comprises means for adjusting the position of the support plates (56, 57) along an axis parallel to the axis (Y).
14/ - Machine à cintrer selon l'une des revendications précédentes, caractérisée en ce que les organes (39, 40) de guidage du tube (1) sont disposés chacun sur l'extrémité d'un bras (50) monté pivotant par rapport au bâti (4) et associé à des moyens élastiques (52) aptes à le maintenir dans une position inclinée vers l'arrière par rapport au sens de déplacement dudit tube.14 / - Bending machine according to one of the preceding claims, characterized in that the members (39, 40) for guiding the tube (1) are each arranged on the end of an arm (50) pivotally mounted relative to to the frame (4) and associated with elastic means (52) able to maintain it in a position inclined towards the rear relative to the direction of movement of said tube.
15/ - Machine à cintrer selon l'une des revendications précédentes, caractérisée en ce qu'elle comprend :15 / - Bending machine according to one of the preceding claims, characterized in that it comprises:
- deux cellules de détection (61, 62) disposées symétriquement de part et d'autre de l'axe (X), en amont des galets de formage (7, 8), de façon que, selon le sens de cintrage, le faisceau de l'une desdites cellules soit coupé par l'extrémité du tube (1) lors de la formation de spires, - des moyens de commande numérique programmés pour calculer la longueur développée pour la formation de chaque tour de spire, comparer cette valeur avec une valeur mémorisée représentative de la longueur développée théorique nécessaire pour la formation d'un tour de spire, et commander, en fonction du résultat de cette comparaison, un déplacement du doigt de pliage (23) le long de sa trajectoire circulaire en vue de la formation du tour de spire suivant, de façon que la longueur totale développée pour la formation d'une spire soit rigoureusement toujours la même pour une série de produits identiques .- two detection cells (61, 62) arranged symmetrically on either side of the axis (X), upstream of the forming rollers (7, 8), so that, according to the direction of bending, the beam of one of said cells is cut by the end of the tube (1) during the formation of turns, - digital control means programmed to calculate the length developed for the formation of each turn of the turn, compare this value with a stored value representative of the length theoretical development necessary for the formation of a turn of the turn, and order, as a function of the result of this comparison, a displacement of the folding finger (23) along its circular trajectory with a view to the formation of the next turn of the turn, so that the total length developed for the formation of a turn is strictly the same for a series of identical products.
16/ - Tête de cintrage pour machine à cintrer des tubes (1) de faibles diamètres prédécoupés et dotés de systèmes de raccords (2, 3) à chacune de leurs extrémités, caractérisée en ce qu'elle comprend :16 / - Bending head for machine for bending tubes (1) of small pre-cut diameters and provided with connection systems (2, 3) at each of their ends, characterized in that it comprises:
- deux galets de formage (7, 8) présentant chacun au moins une gorge périphérique (9, 10) de section semi-circulaire adaptée pour former, dans une position accolée desdits galets, un conduit de guidage axé selon un axe (X), présentant un col de diamètre sensiblement supérieur à celui du tube (1),- two forming rollers (7, 8) each having at least one peripheral groove (9, 10) of semi-circular section adapted to form, in an adjoining position of said rollers, a guide duct oriented along an axis (X), having a neck with a diameter substantially greater than that of the tube (1),
- des moyens (12-17) de déplacement relatif des galets de formage (7, 8), aptes à positionner lesdits galets soit dans leur position accolée, soit dans une position dite d'ouverture, apte à permettre le passage du tube (1) selon un axe perpendiculaire à l'axe (X),- Means (12-17) for relative displacement of the forming rollers (7, 8), capable of positioning said rollers either in their adjoining position, or in a so-called open position, suitable for allowing the passage of the tube (1 ) along an axis perpendicular to the axis (X),
- un doigt de pliage (23) disposé en aval et à proximité des galets de formage (7, 8),- a folding finger (23) disposed downstream and near the forming rollers (7, 8),
- des moyens (24-27) de déplacement du doigt de pliage (23) selon une trajectoire circulaire centrée sur un axe (Y) orthogonal à l'axe (X),- means (24-27) for moving the folding finger (23) along a circular trajectory centered on an axis (Y) orthogonal to the axis (X),
- des moyens (30) de déplacement en translation du doigt de pliage (23) selon un axe (Y-j ) parallèle à (Y) ,means (30) for translational movement of the folding finger (23) along an axis (Y- j ) parallel to (Y),
- des organes (39, 40) de guidage du tube (1) disposés de part et d'autre de l'axe (X) de façon à venir au contact dudit tube en amont et à proximité des galets de formage (7, 8), lesdits organes de guidage étant adaptés pour s'escamoter transversalement sous l'effet d'un effort longitudinal exercé par les moyens de préhension (5). - members (39, 40) for guiding the tube (1) arranged on either side of the axis (X) so as to come into contact with said tube upstream and near the forming rollers (7, 8 ), said guide members being adapted to retract transversely under the effect of a longitudinal force exerted by the gripping means (5).
EP98902049A 1997-01-14 1998-01-09 Machine for bending tubes with small diameter Expired - Lifetime EP0952896B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9700437A FR2758281B1 (en) 1997-01-14 1997-01-14 MACHINE FOR BENDING LOW DIAMETER TUBES, IN PARTICULAR LESS THAN 10MM, PRECUT AND PRESENTING CONNECTION SYSTEMS AT EACH OF THEIR ENDS, AND BENDING HEAD FOR SUCH A MACHINE
FR9700437 1997-01-14
PCT/FR1998/000033 WO1998031484A1 (en) 1997-01-14 1998-01-09 Machine for bending tubes with small diameter

Publications (2)

Publication Number Publication Date
EP0952896A1 true EP0952896A1 (en) 1999-11-03
EP0952896B1 EP0952896B1 (en) 2001-05-16

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EP98902049A Expired - Lifetime EP0952896B1 (en) 1997-01-14 1998-01-09 Machine for bending tubes with small diameter

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US (1) US6185969B1 (en)
EP (1) EP0952896B1 (en)
CA (1) CA2275946A1 (en)
DE (1) DE69800795T2 (en)
FR (1) FR2758281B1 (en)
WO (1) WO1998031484A1 (en)

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Publication number Priority date Publication date Assignee Title
TW311945B (en) * 1994-11-23 1997-08-01 Barmag Barmer Maschf
US7213152B1 (en) * 2000-02-14 2007-05-01 Intel Corporation Modular bios update mechanism
FR2922127B1 (en) * 2007-10-15 2010-03-05 Jaubjaub Consulting MACHINE FOR BENDING A PROFILE AND BENDING TOOLS FOR SUCH A MACHINE
EP3255510B1 (en) * 2016-06-10 2019-06-05 Nivarox-FAR S.A. Calender and method for calendering a timepiece barrel spring
US11635073B2 (en) * 2017-12-18 2023-04-25 Flex Ltd. Linear peristaltic pump

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US1047612A (en) * 1911-09-16 1912-12-17 Frederick Brantigam Machine for bending tubes.
US1567107A (en) * 1922-08-04 1925-12-29 Bonn Carl Robert Hugo Machine for bending tubes and the like
US3373587A (en) * 1966-12-08 1968-03-19 Shubin Vladimir Nikolaevich Automatic tube bending machines
US3430474A (en) * 1967-01-10 1969-03-04 Morley Mann Apparatus for forming coils
FR2554021B1 (en) 1983-11-02 1987-09-04 Autocoussin Sa IMPROVED AUTOMATIC MACHINE FOR CAMBERING ACCORDING TO A SPECIAL CONFIGURATION OF THIN AND STRAIGHT ELEMENTS, ESPECIALLY METAL WIRES
IT8453880V0 (en) * 1984-10-02 1984-10-02 Mauro Meliga BENDING MACHINE FOR PROFILED AND SIMILAR TUBES
FR2624038A1 (en) * 1987-12-02 1989-06-09 Snecma PIPE BENDING TOOL AND METHOD FOR MANUFACTURING A WELDED TIP PIPE
DE4124715C2 (en) * 1990-07-26 1994-11-24 Usui Kokusai Sangyo Kk Device for multiple bending of a metal pipe
JPH04127919A (en) * 1990-09-17 1992-04-28 Opton Co Ltd Device for bending
IT1251934B (en) * 1991-10-16 1995-05-27 Macchine Curvatubi Crippa Agos MULTIPURPOSE PIPE BENDING MACHINE

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See references of WO9831484A1 *

Also Published As

Publication number Publication date
EP0952896B1 (en) 2001-05-16
DE69800795T2 (en) 2002-05-29
US6185969B1 (en) 2001-02-13
FR2758281B1 (en) 1999-04-02
DE69800795D1 (en) 2001-06-21
FR2758281A1 (en) 1998-07-17
CA2275946A1 (en) 1998-07-23
WO1998031484A1 (en) 1998-07-23

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