EP3335813B1 - Sheet metal forming machine by longitudinal stretching and method using such a machine - Google Patents

Sheet metal forming machine by longitudinal stretching and method using such a machine Download PDF

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Publication number
EP3335813B1
EP3335813B1 EP17306795.0A EP17306795A EP3335813B1 EP 3335813 B1 EP3335813 B1 EP 3335813B1 EP 17306795 A EP17306795 A EP 17306795A EP 3335813 B1 EP3335813 B1 EP 3335813B1
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EP
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Prior art keywords
tipping
axis
chassis
tipping axis
complementary
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German (de)
French (fr)
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EP3335813A1 (en
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Benoît BOURRIAU
Julien Clergeau
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ACB
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ACB
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    • 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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/04—Clamping arrangements
    • 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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening

Definitions

  • the present invention relates to the general field of forming or forming sheets (in particular metal sheets) by longitudinal stretching by means of drawing presses.
  • this machine for forming sheet metal by longitudinal stretching, this machine comprising two drawing heads located on either side of a forming tool for the sheet, which drawing heads each comprise a jaw line secured to a support structure which is associated with drawing means and which is mounted on a frame by means of a tilting axis, and at least one tilt cylinder being interposed between said frame and said support structure, to allow rotation of said support structure about said tilting axis.
  • the machines or longitudinal drawing presses are conventionally constituted by two drawing heads arranged vis-à-vis, each comprising a line of jaws for gripping the edges of width of the sheet that is desired to conform.
  • a forming tool on the active side of which the sheet is intended to be applied by force, for the purpose of shaping.
  • the active face of this forming tool is adapted to the profile of the part that one wishes to obtain.
  • the lines jaws vis-à-vis are each associated with actuating cylinders to adapt their positioning in space and to implement the desired stretching function.
  • each jaw line is carried by a support structure equipped with drawing jacks; and this support structure is mounted on a frame by means of a horizontal tilting axis subjected to the action of one or more tilting cylinders.
  • the two frames which carry the jaw lines are mounted on a support frame, at least one of them slidably along an axis of displacement parallel to the axis of stretching.
  • EP-1,726,377 relates to a longitudinal drawing press provided with curved jaw lines, which makes it possible to create a differential traction movement between the central jaw and the peripheral jaws, so as to tend to standardize the drawing state on the surface of the jaw. sheet metal and generate a stretching said "with edge compensation effect".
  • the forming tool located between the two drawing heads needs to be adjusted in height, by means of adapted extensions, depending on the sheet that is wish to conform and draw characteristics to apply to it.
  • the present invention proposes a machine for forming sheet metal by longitudinal stretching, which machine comprises two drawing heads located on either side of a forming tool for the sheet, which drawing heads each comprise a jaw line secured to a support structure which is associated with drawing means and which is mounted on a frame by means of a tilting axis, at least one tilting cylinder being interposed between said frame and said support structure, to allow rotation of said support structure about said tilting axis, and said frame being carried by a support frame, this machine being characterized in that it comprises means interposed between said support frame and said frame, arranged to allow adjustment of the vertical positioning of said tilting axis.
  • Such adjustment means make it possible to adjust the height of the jaw lines on either side of the forming tool; we can thus dispense with the presence of the systems of extensions needed in the machines of the state of the technique and thus simplify the tooling structure.
  • the current adjustment problems of the forming tool are reported on the drawing heads, the corresponding settings being then easier to achieve.
  • These particular means also confer additional adjustment and implementation possibilities. In particular, they make it possible to adjust certain angles and heights during forming, thus making the operation more fluid and improving productivity. The versatility characteristics of the machine are further improved. And, for the machines concerned, it is also possible to implement an edge compensation on the sheet during the forming operation.
  • the frame is mounted on the support frame via a complementary tilt axis, parallel or substantially parallel to the tilting axis, at least one complementary tilt cylinder being interposed between said frame and said support frame to allow the rotational maneuver of said frame about said complementary tilt axis and thus allow adjustment of the vertical positioning of said tilt axis.
  • the tilting axis and the complementary tilting axis preferably extend horizontally or substantially horizontally.
  • said complementary tilt axis is advantageously located on the opposite side of the tilting axis with respect to the associated jaw line.
  • the frame is mounted on the support frame by means which allow it to move relative to said support frame parallel to itself along a vertical axis.
  • Said frame then advantageously consists of a vertical sliding carriage, mounted on vertical rails and operated by one or more cylinders.
  • the machine according to the invention may comprise control means adapted to manage the displacement of the tilt cylinder or jacks and means for adjusting the vertical positioning of the tilting axis, as a function of the spatial position. desired bit lines.
  • the invention also relates to a method of implementing a machine as defined above, consisting in managing the displacement of the tilt cylinder (s) and means for adjusting the vertical positioning of the tilting axis, depending the desired spatial position of the jaw lines.
  • the longitudinal stretching machine 1 according to a preferred embodiment of the invention, illustrated on the Figures 1 and 2 , comprises two stretching heads 2, 2 ', here identical, mounted facing one another on a support frame 3, on either side of a forming tool 4.
  • the forming tool 4 is positioned and fixed on extensions 3a which are themselves fixed on the frame 3 between the two drawing heads 2, 2 '; his active face is adapted according to the final shape of the sheet metal parts T that it is desired to obtain.
  • Each drawing head 2, 2 ' consists of a line of jaws 5 carried by mechanical means adapted to give it the desired spatial movements.
  • jaw lines 5 have the function of clamping the width edge of the worked sheet by a jaw grip. They are here each constituted of a juxtaposition of five to eleven jaws 6 (here in this case seven in number); and they are arranged in a plane perpendicular to the drawing direction (marked at 7 on the figure 2 ), or substantially perpendicular to this direction of stretching, to suitably perform their function.
  • Each jaw line 5 comprises means enabling it to be placed in a rectilinear, curved (concave or convex) configuration, or else in S.
  • the jaw line 5 of the two drawing heads 2, 2 ' is placed in horizontal straight position; but it can also be in other configurations, for example in a rectilinear position, inclined at an angle to the horizontal, in an S configuration, or in a convex curved position.
  • the configuration adopted is a function of the inclination and / or the curved shape that one wishes to print on the sheet, so that it can follow the profile of the edge of the tool 4 for the sake of precision of the part performed.
  • the jaw lines 5 are each integral with a support structure 8 subjected to the action of one or more drawing jacks 9.
  • This support structure 8 (with the jaw line 5 and the drawing jacks 9 associated) is mounted on a frame 10 via a tilting axis 11; and at least one tilt cylinder 12 is interposed between the frame 10 and the support structure 8, to allow the pivoting operation of this support structure 8 around the tilting axis 11.
  • two tilt cylinders 12 provide pivoting operation of the support structure 8 relative to the chassis 10.
  • the tilting axis 11 extends horizontally or approximately horizontally, perpendicularly to the direction of stretching 7.
  • the forming machine 1 comprises means which are interposed between the support frame 3 and the frame 10, arranged to allow adjustment of the vertical positioning of the tilting axis 11 (that is to say to allow adjustment of the height of the tilting axis 11 and thus the jaw line 5).
  • the frame 10 is mounted on the support frame 3 via a complementary tilt axis 13, and at least one complementary tilt cylinder 14 is interposed between said frame 10 and said support frame 3, arranged to provide the maneuver in rotation of said chassis 10 about said complementary tilt axis 13.
  • the complementary tilting axis 13 extends horizontally, parallel or substantially parallel to the tilting axis 11.
  • this complementary tilting axis 13 is situated on the opposite side of the tilting axis 11 with respect to the jaw line 5, here below the horizontal plane through which said tilting axis 11 passes.
  • two complementary tilt cylinders 14 provide pivoting operation of the frame 10 relative to the support frame 3.
  • each drawing head 2, 2 ' (with its frame 10, the complementary tilting axis 13 and the associated complementary tilting cylinders 14) is carried by a carriage-like frame portion 31, which is mounted on a mounting base portion 32 fixed.
  • the two carriages 31 have the possibility of moving in translation in the stretching direction 7 on the frame base portion 32, that is to say in a direction perpendicular to the tilting axis 11 and to the axis complementary tilting 13, this under the action of appropriate displacement means (eg cylinders, rack-and-pinion systems or screw-nut systems).
  • appropriate displacement means eg cylinders, rack-and-pinion systems or screw-nut systems.
  • the displacement of each mobile frame 31 is achieved by direct action by means of a jack one part of which is fixed on said movable frame 31 and the other on the frame base 32.
  • the stationary base portion 32 fixed is common to both movable frame parts 31 and it also serves as support for the forming tool 4 through the extensions 3a.
  • the drawing machine 1 comprises control means adapted to manage the displacement of the tilt cylinders 12, complementary tilt cylinders 14 and drawing cylinders 9, depending on the desired spatial position of the lines. of jaw 5, this simultaneously or successively.
  • the tilting axis 11 of the drawing heads 2 of the drawing machine 1 according to the invention can be used conventionally, by means of the tilt cylinders 12, to rotate the jaw line 5, by example on an angular sector has of the order of 30 °.
  • the stretching machine 1 may be adapted to rotate said jaw lines 5 between a negative angle b (for example of the order of 5 to 10 °) and a positive angle c (for example of the order of 5 to 30 °).
  • any other combined management of the tilting axis 11 and the complementary tilt axis 13 can be implemented.
  • the carrier frame of the support structure 8 is mounted on the support frame 3 by means which allow its displacement parallel to itself along a vertical axis.
  • These displacement means then advantageously consist of a chassis 10 'in the form of a carriage sliding vertically along slides 15 integral with the movable frame 31, and actuated by at least one hydraulic cylinder 14'.
  • a chassis 10 ' in the form of a carriage sliding vertically along slides 15 integral with the movable frame 31, and actuated by at least one hydraulic cylinder 14'.
  • two hydraulic cylinders 14 ' are placed on either side of the carriage 10'.
  • the cylinder (s) 14 ' can be placed at the bottom or at the top of the mobile frame 31.
  • the up / down function of the support frame 8 and therefore of the jaw line 5 is performed by acting directly on the tilting axis 11 placed on the sliding frame 10 '.
  • the height dimension x + ⁇ x of the jaw line 5 on the figure 9 is greater than the x rating on the figure 8 .
  • control means are adapted to manage the displacement of the tilt cylinders 12 and the carriage with vertical guidance, depending on the desired spatial position of the jaw lines 5, that simultaneously or successively.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Description

DOMAINE TECHNIQUE AUQUEL SE RAPPORTE L'INVENTIONTECHNICAL FIELD TO WHICH THE INVENTION REFERS

La présente invention concerne le domaine général du façonnage ou formage de tôles (en particulier des tôles métalliques) par étirage longitudinal au moyen de presses d'étirage.The present invention relates to the general field of forming or forming sheets (in particular metal sheets) by longitudinal stretching by means of drawing presses.

Elle concerne plus particulièrement une machine (ou presse) de formage de tôle par étirage longitudinal, cette machine comprenant deux têtes d'étirage situées de part et d'autre d'un outil de formage pour la tôle, lesquelles têtes d'étirage comprennent chacune une ligne de mors solidaire d'une structure support qui est associée à des moyens d'étirage et qui est montée sur un châssis par l'intermédiaire d'un axe de basculement, et au moins un vérin de basculement étant interposé entre ledit châssis et ladite structure support, pour permettre la manoeuvre en rotation de ladite structure support autour dudit axe de basculement.It relates more particularly to a machine (or press) for forming sheet metal by longitudinal stretching, this machine comprising two drawing heads located on either side of a forming tool for the sheet, which drawing heads each comprise a jaw line secured to a support structure which is associated with drawing means and which is mounted on a frame by means of a tilting axis, and at least one tilt cylinder being interposed between said frame and said support structure, to allow rotation of said support structure about said tilting axis.

ARRIERE-PLAN TECHNOLOGIQUEBACKGROUND

Les machines ou presses d'étirage longitudinal sont classiquement constituées de deux têtes d'étirage disposées en vis-à-vis, comprenant chacune une ligne de mors destinée à agripper les bordures de largeur de la tôle que l'on souhaite conformer.The machines or longitudinal drawing presses are conventionally constituted by two drawing heads arranged vis-à-vis, each comprising a line of jaws for gripping the edges of width of the sheet that is desired to conform.

Entre ces deux lignes de mors est disposé un outil de formage sur la face active duquel la tôle est destinée à être appliquée à force, en vue de sa mise en forme. La face active de cet outil de formage est adaptée au profil de la pièce que l'on souhaite obtenir.Between these two jaw lines is disposed a forming tool on the active side of which the sheet is intended to be applied by force, for the purpose of shaping. The active face of this forming tool is adapted to the profile of the part that one wishes to obtain.

Les lignes de mors en vis-à-vis sont chacune associées à des vérins de manoeuvre pour adapter leur positionnement dans l'espace et pour mettre en oeuvre la fonction d'étirage recherchée.The lines jaws vis-à-vis are each associated with actuating cylinders to adapt their positioning in space and to implement the desired stretching function.

Par exemple, comme décrit dans le document EP-1 726 377 , qui forme la base du préambule de la revendication 1, chaque ligne de mors est portée par une structure support équipée de vérins d'étirage ; et cette structure support est montée sur un châssis par l'intermédiaire d'un axe de basculement horizontal soumis à l'action d'un ou de plusieurs vérins de basculement.
Les deux châssis qui portent les lignes de mors sont montés sur un bâti support, l'un d'eux, au moins, de manière coulissante selon un axe de déplacement parallèle à l'axe d'étirage.
En particulier ce document EP-1 726 377 concerne une presse d'étirage longitudinal munie de lignes de mors incurvables, qui permet de créer un mouvement différentiel de traction entre le mors central et les mors périphériques, cela de manière à tendre à uniformiser l'état d'étirage sur la surface de la tôle et générer un étirage dit « avec effet de compensation de bord ».For example, as described in the document EP-1,726,377 , which forms the basis of the preamble of claim 1, each jaw line is carried by a support structure equipped with drawing jacks; and this support structure is mounted on a frame by means of a horizontal tilting axis subjected to the action of one or more tilting cylinders.
The two frames which carry the jaw lines are mounted on a support frame, at least one of them slidably along an axis of displacement parallel to the axis of stretching.
In particular this document EP-1,726,377 relates to a longitudinal drawing press provided with curved jaw lines, which makes it possible to create a differential traction movement between the central jaw and the peripheral jaws, so as to tend to standardize the drawing state on the surface of the jaw. sheet metal and generate a stretching said "with edge compensation effect".

Lors de la mise en oeuvre des machines d'étirage longitudinal connues, l'outil de formage situé entre les deux têtes d'étirage nécessite d'être ajusté en hauteur, au moyen de rehausses adaptées, en fonction de la tôle que l'on souhaite conformer et des caractéristiques d'étirage à lui appliquer.During the implementation of known longitudinal stretching machines, the forming tool located between the two drawing heads needs to be adjusted in height, by means of adapted extensions, depending on the sheet that is wish to conform and draw characteristics to apply to it.

Bien qu'un logiciel, fourni avec la machine, permette d'orienter et de concevoir l'outil de formage pour être convenablement positionné par rapport à la cinématique de la machine et aux efforts à supporter :

  • les outils déjà existants peuvent nécessiter dans certains cas l'utilisation de rehausses complémentaires, et
  • les nouveaux outils conçus peuvent avoir des hauteurs et des masses importantes, génératrices de coûts.
Although software, supplied with the machine, allows to guide and design the forming tool to be properly positioned with respect to the kinematics of the machine and efforts to support:
  • already existing tools may require in some cases the use of complementary extensions, and
  • the new tools designed can have significant heights and masses, generating costs.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

Afin de remédier aux inconvénients précités de l'état de la technique, la présente invention propose une machine de formage de tôle par étirage longitudinal, laquelle machine comprend deux têtes d'étirage situées de part et d'autre d'un outil de formage pour la tôle, lesquelles têtes d'étirage comprennent chacune une ligne de mors solidaire d'une structure support qui est associée à des moyens d'étirage et qui est montée sur un châssis par l'intermédiaire d'un axe de basculement, au moins un vérin de basculement étant interposé entre ledit châssis et ladite structure support, pour permettre la manoeuvre en rotation de ladite structure support autour dudit axe de basculement,
et ledit châssis étant porté par un bâti support,
cette machine étant caractérisée par le fait qu'elle comprend des moyens, interposés entre ledit bâti support et ledit châssis, agencés pour permettre un réglage du positionnement vertical dudit axe de basculement.In order to overcome the aforementioned drawbacks of the state of the art, the present invention proposes a machine for forming sheet metal by longitudinal stretching, which machine comprises two drawing heads located on either side of a forming tool for the sheet, which drawing heads each comprise a jaw line secured to a support structure which is associated with drawing means and which is mounted on a frame by means of a tilting axis, at least one tilting cylinder being interposed between said frame and said support structure, to allow rotation of said support structure about said tilting axis,
and said frame being carried by a support frame,
this machine being characterized in that it comprises means interposed between said support frame and said frame, arranged to allow adjustment of the vertical positioning of said tilting axis.

De tels moyens de réglage permettent d'ajuster la hauteur des lignes de mors de part et d'autre de l'outil de formage ; on peut donc se dispenser de la présence des systèmes de rehausses nécessaires dans les machines de l'état de la technique et simplifier ainsi la structure des outillages.
Les problèmes d'ajustage actuels de l'outil de formage sont reportés sur les têtes d'étirage, les réglages correspondants étant alors plus faciles à réaliser.
Ces moyens particuliers confèrent également des possibilités de réglage et de mise en oeuvre supplémentaires. Ils permettent notamment d'ajuster certains angles et certaines hauteurs pendant le formage, rendant ainsi l'opération plus fluide et améliorant la productivité.
Les caractéristiques de versatilité de la machine sont encore améliorées. Et, pour les machines concernées, il est aussi possible de mettre en oeuvre une compensation de bord sur la tôle pendant l'opération de formage.Such adjustment means make it possible to adjust the height of the jaw lines on either side of the forming tool; we can thus dispense with the presence of the systems of extensions needed in the machines of the state of the technique and thus simplify the tooling structure.
The current adjustment problems of the forming tool are reported on the drawing heads, the corresponding settings being then easier to achieve.
These particular means also confer additional adjustment and implementation possibilities. In particular, they make it possible to adjust certain angles and heights during forming, thus making the operation more fluid and improving productivity.
The versatility characteristics of the machine are further improved. And, for the machines concerned, it is also possible to implement an edge compensation on the sheet during the forming operation.

Selon une première forme de réalisation préférée, le châssis est monté sur le bâti support par l'intermédiaire d'un axe de basculement complémentaire, parallèle ou sensiblement parallèle à l'axe de basculement, au moins un vérin de basculement complémentaire étant interposé entre ledit châssis et ledit bâti support pour permettre la manoeuvre en rotation dudit châssis autour dudit axe de basculement complémentaire et permettre ainsi le réglage du positionnement vertical dudit axe de basculement.
Dans ce cadre l'axe de basculement et l'axe de basculement complémentaire s'étendent de préférence horizontalement ou sensiblement horizontalement.
En outre ledit axe de basculement complémentaire est avantageusement situé du côté opposé de l'axe de basculement par rapport à la ligne de mors associée.According to a first preferred embodiment, the frame is mounted on the support frame via a complementary tilt axis, parallel or substantially parallel to the tilting axis, at least one complementary tilt cylinder being interposed between said frame and said support frame to allow the rotational maneuver of said frame about said complementary tilt axis and thus allow adjustment of the vertical positioning of said tilt axis.
In this context the tilting axis and the complementary tilting axis preferably extend horizontally or substantially horizontally.
In addition, said complementary tilt axis is advantageously located on the opposite side of the tilting axis with respect to the associated jaw line.

Selon une variante de réalisation préférée le châssis est monté sur le bâti support par l'intermédiaire de moyens qui permettent son déplacement par rapport audit bâti support parallèlement à lui-même le long d'un axe vertical.
Ledit châssis consiste alors avantageusement en un chariot coulissant verticalement, monté sur des glissières verticales et manoeuvré par un ou plusieurs vérins.According to a preferred embodiment, the frame is mounted on the support frame by means which allow it to move relative to said support frame parallel to itself along a vertical axis.
Said frame then advantageously consists of a vertical sliding carriage, mounted on vertical rails and operated by one or more cylinders.

Selon une autre particularité le bâti support comprend de préférence:

  • une partie de bâti mobile, qui porte lesdits moyens de réglage du positionnement vertical de l'axe de basculement, et
  • une partie embase de bâti,
ladite partie de bâti mobile étant montée mobile en translation sur ladite partie embase de bâti, selon une direction perpendiculaire à l'axe de basculement et le cas échéant à l'axe de basculement complémentaire.
La partie embase de bâti est alors avantageusement commune aux deux têtes d'étirage et sert de support à l'outil de formage.According to another feature, the support frame preferably comprises:
  • a moving frame part, which carries said means for adjusting the vertical positioning of the tilting axis, and
  • part of a base,
said movable frame portion being movably mounted in translation on said frame base portion, in a direction perpendicular to the tilting axis and optionally to the complementary tilting axis.
The frame base portion is then advantageously common to the two drawing heads and serves as a support for the forming tool.

Toujours selon une autre caractéristique, la machine selon l'invention peut comprendre des moyens de commande adaptés pour gérer le déplacement du ou des vérins de basculement et des moyens de réglage du positionnement vertical de l'axe de basculement, en fonction de la position spatiale souhaitée des lignes de mors.According to another characteristic, the machine according to the invention may comprise control means adapted to manage the displacement of the tilt cylinder or jacks and means for adjusting the vertical positioning of the tilting axis, as a function of the spatial position. desired bit lines.

L'invention concerne également un procédé de mise en oeuvre d'une machine telle que définie ci-dessus, consistant à gérer le déplacement du ou des vérins de basculement et des moyens de réglage du positionnement vertical de l'axe de basculement, en fonction de la position spatiale souhaitée des lignes de mors.The invention also relates to a method of implementing a machine as defined above, consisting in managing the displacement of the tilt cylinder (s) and means for adjusting the vertical positioning of the tilting axis, depending the desired spatial position of the jaw lines.

DESCRIPTION DETAILLEE D'UN EXEMPLE DE RÉALISATIONDETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT

La description qui va suivre en regard des dessins annexés, donnés à titre d'exemples, fera bien comprendre en quoi consiste l'invention et comment elle peut être réalisée.The following description with reference to the accompanying drawings, given by way of example, will make it clear what the invention consists of and how it can be achieved.

Sur les dessins annexés :

  • la figure 1 est une vue schématique de côté d'une machine de formage de tôle par étirage longitudinal conforme à un mode de réalisation préféré de l'invention ;
  • la figure 2 est une vue de dessus de la machine d'étirage illustrée sur la figure 1 ;
  • les figures 3 à 7 sont des vues schématiques de côté qui illustrent différentes configurations spatiales possibles des têtes d'étirage de la machine d'étirage illustrée sur les figures 1 et 2 ;
  • la figure 8 représente schématiquement une variante de réalisation des moyens de réglage de hauteur de l'axe de basculement, en forme de chariot guidé verticalement, ici en position basse ;
  • la figure 9 est une vue schématique similaire à la figure 8, montrant le chariot guidé verticalement, en position haute.
In the accompanying drawings:
  • the figure 1 is a schematic side view of a longitudinal stretch forming machine according to a preferred embodiment of the invention;
  • the figure 2 is a top view of the stretching machine illustrated on the figure 1 ;
  • the Figures 3 to 7 are schematic side views illustrating different possible spatial configurations of the drawing heads of the drawing machine illustrated in the drawings. Figures 1 and 2 ;
  • the figure 8 schematically represents an alternative embodiment of the height adjustment means of the tilt axis, in the form of vertically guided carriage, here in the low position;
  • the figure 9 is a schematic view similar to the figure 8 , showing the vertically guided carriage, in the up position.

La machine d'étirage longitudinal 1 conforme à un mode de réalisation préféré de l'invention, illustrée sur les figures 1 et 2, comprend deux têtes d'étirage 2, 2', ici identiques, montées en vis-à-vis sur un bâti support 3, de part et d'autre d'un outil de formage 4.The longitudinal stretching machine 1 according to a preferred embodiment of the invention, illustrated on the Figures 1 and 2 , comprises two stretching heads 2, 2 ', here identical, mounted facing one another on a support frame 3, on either side of a forming tool 4.

L'outil de formage 4 est positionné et fixé sur des rehausses 3a qui sont elles-mêmes fixées sur le bâti 3 entre les deux têtes d'étirage 2, 2' ; sa face active est adaptée selon la forme finale des pièces de tôle T que l'on souhaite obtenir.The forming tool 4 is positioned and fixed on extensions 3a which are themselves fixed on the frame 3 between the two drawing heads 2, 2 '; his active face is adapted according to the final shape of the sheet metal parts T that it is desired to obtain.

Chaque tête d'étirage 2, 2' est constituée d'une ligne de mors 5 portée par des moyens mécaniques adaptés pour lui conférer les mouvements spatiaux recherchés.Each drawing head 2, 2 'consists of a line of jaws 5 carried by mechanical means adapted to give it the desired spatial movements.

Ces lignes de mors 5 ont pour fonction de brider la bordure de largeur de la tôle travaillée, par une prise en mors. Elles sont ici chacune constituées d'une juxtaposition de cinq à onze mors 6 (en l'occurrence ici au nombre de sept); et elles sont disposées dans un plan perpendiculaire au sens d'étirage (repéré en 7 sur la figure 2), ou sensiblement perpendiculaire à ce sens d'étirage, pour remplir convenablement leur fonction.These jaw lines 5 have the function of clamping the width edge of the worked sheet by a jaw grip. They are here each constituted of a juxtaposition of five to eleven jaws 6 (here in this case seven in number); and they are arranged in a plane perpendicular to the drawing direction (marked at 7 on the figure 2 ), or substantially perpendicular to this direction of stretching, to suitably perform their function.

Chaque ligne de mors 5 comprend des moyens permettant sa mise en configuration rectiligne, incurvée (concave ou convexe), ou encore en S.Each jaw line 5 comprises means enabling it to be placed in a rectilinear, curved (concave or convex) configuration, or else in S.

Sur les figures 1 et 2, la ligne de mors 5 des deux têtes d'étirage 2, 2' est placée en position rectiligne horizontale ; mais elle peut également se présenter selon d'autres configurations, par exemple en position rectiligne, inclinée d'un certain angle par rapport à l'horizontale, dans une configuration en S, ou encore dans une position incurvée convexe.
La configuration adoptée est fonction de l'inclinaison et/ou de la forme incurvée que l'on souhaite imprimer à la tôle, afin que celle-ci puisse suivre le profil du bord de l'outil 4 dans un souci de précision de la pièce réalisée.On the Figures 1 and 2 , the jaw line 5 of the two drawing heads 2, 2 'is placed in horizontal straight position; but it can also be in other configurations, for example in a rectilinear position, inclined at an angle to the horizontal, in an S configuration, or in a convex curved position.
The configuration adopted is a function of the inclination and / or the curved shape that one wishes to print on the sheet, so that it can follow the profile of the edge of the tool 4 for the sake of precision of the part performed.

Pour remplir leur fonction d'étirage, les lignes de mors 5 sont chacune solidaires d'une structure support 8 soumise à l'action d'un ou de plusieurs vérins d'étirage 9.To fulfill their stretching function, the jaw lines 5 are each integral with a support structure 8 subjected to the action of one or more drawing jacks 9.

Cette structure support 8 (avec la ligne de mors 5 et les vérins d'étirage 9 associés) est montée sur un châssis 10 par l'intermédiaire d'un axe de basculement 11 ; et au moins un vérin de basculement 12 est interposé entre le châssis 10 et la structure support 8, pour permettre la manoeuvre en pivotement de cette structure support 8 autour de l'axe de basculement 11.This support structure 8 (with the jaw line 5 and the drawing jacks 9 associated) is mounted on a frame 10 via a tilting axis 11; and at least one tilt cylinder 12 is interposed between the frame 10 and the support structure 8, to allow the pivoting operation of this support structure 8 around the tilting axis 11.

Comme on peut le voir sur les figures 1 et 2, dans l'exemple de réalisation illustré, deux vérins de basculement 12 assurent la manoeuvre en pivotement de la structure support 8 par rapport au châssis 10.As can be seen on the Figures 1 and 2 , in the exemplary embodiment illustrated, two tilt cylinders 12 provide pivoting operation of the support structure 8 relative to the chassis 10.

L'axe de basculement 11 s'étend horizontalement ou approximativement horizontalement, perpendiculairement au sens d'étirage 7.The tilting axis 11 extends horizontally or approximately horizontally, perpendicularly to the direction of stretching 7.

Conformément à l'invention, la machine de formage 1 comprend des moyens qui sont interposés entre le bâti support 3 et le châssis 10, agencés pour permettre un réglage du positionnement vertical de l'axe de basculement 11 (c'est-à-dire pour permettre un réglage de la hauteur de l'axe de basculement 11 et donc de la ligne de mors 5).According to the invention, the forming machine 1 comprises means which are interposed between the support frame 3 and the frame 10, arranged to allow adjustment of the vertical positioning of the tilting axis 11 (that is to say to allow adjustment of the height of the tilting axis 11 and thus the jaw line 5).

Pour cela, tel qu'illustré sur les figures 1 et 2, le châssis 10 est monté sur le bâti support 3 par l'intermédiaire d'un axe de basculement complémentaire 13, et au moins un vérin de basculement complémentaire 14 est interposé entre ledit châssis 10 et ledit bâti support 3, agencé pour assurer la manoeuvre en rotation dudit châssis 10 autour dudit axe de basculement complémentaire 13.For this, as illustrated on the Figures 1 and 2 , the frame 10 is mounted on the support frame 3 via a complementary tilt axis 13, and at least one complementary tilt cylinder 14 is interposed between said frame 10 and said support frame 3, arranged to provide the maneuver in rotation of said chassis 10 about said complementary tilt axis 13.

L'axe de basculement complémentaire 13 s'étend horizontalement, de manière parallèle ou sensiblement parallèle à l'axe de basculement 11.The complementary tilting axis 13 extends horizontally, parallel or substantially parallel to the tilting axis 11.

Comme on peut le voir toujours sur les figures 1 et 2, cet axe de basculement complémentaire 13 est situé du côté opposé de l'axe de basculement 11 par rapport à la ligne de mors 5, ici sous le plan horizontal par lequel passe ledit axe de basculement 11.As we can always see on the Figures 1 and 2 this complementary tilting axis 13 is situated on the opposite side of the tilting axis 11 with respect to the jaw line 5, here below the horizontal plane through which said tilting axis 11 passes.

En l'occurrence, dans l'exemple de réalisation illustré, deux vérins de basculement complémentaires 14 assurent la manoeuvre en pivotement du châssis 10 par rapport au bâti support 3.In the present example, in the exemplary embodiment illustrated, two complementary tilt cylinders 14 provide pivoting operation of the frame 10 relative to the support frame 3.

Dans le mode de réalisation des figures 1 et 2, chaque tête d'étirage 2, 2' (avec son châssis 10, l'axe de basculement complémentaire 13 et les vérins de basculement complémentaires 14 associés), est portée par une partie de bâti mobile 31, en forme de chariot, qui est montée sur une partie embase de bâti 32 fixe.In the embodiment of Figures 1 and 2 each drawing head 2, 2 '(with its frame 10, the complementary tilting axis 13 and the associated complementary tilting cylinders 14) is carried by a carriage-like frame portion 31, which is mounted on a mounting base portion 32 fixed.

Les deux chariots 31 ont la possibilité de se déplacer en translation dans le sens d'étirage 7 sur la partie embase de bâti 32, c'est-à-dire selon une direction perpendiculaire à l'axe de basculement 11 et à l'axe de basculement complémentaire 13, cela sous l'action de moyens de déplacement appropriés (par exemple des vérins, des systèmes pignon-crémaillères ou encore des systèmes de vis-écrou). Dans le mode de réalisation des figures 1 et 2 le déplacement de chaque bâti mobile 31 est réalisé par action directe grâce à un vérin dont une partie est fixée sur ledit bâti mobile 31 et l'autre sur l'embase de bâti 32.The two carriages 31 have the possibility of moving in translation in the stretching direction 7 on the frame base portion 32, that is to say in a direction perpendicular to the tilting axis 11 and to the axis complementary tilting 13, this under the action of appropriate displacement means (eg cylinders, rack-and-pinion systems or screw-nut systems). In the embodiment of Figures 1 and 2 the displacement of each mobile frame 31 is achieved by direct action by means of a jack one part of which is fixed on said movable frame 31 and the other on the frame base 32.

La partie embase de bâti 32 fixe est commune aux deux parties de bâti mobile 31 et elle sert également de support à l'outil de formage 4 par l'intermédiaire des rehausses 3a.The stationary base portion 32 fixed is common to both movable frame parts 31 and it also serves as support for the forming tool 4 through the extensions 3a.

La machine d'étirage 1 conforme à l'invention comprend des moyens de commande adaptés pour gérer le déplacement des vérins de basculement 12, des vérins de basculement complémentaires 14 et des vérins d'étirage 9, en fonction de la position spatiale souhaitée des lignes de mors 5, cela en simultané ou successivement.The drawing machine 1 according to the invention comprises control means adapted to manage the displacement of the tilt cylinders 12, complementary tilt cylinders 14 and drawing cylinders 9, depending on the desired spatial position of the lines. of jaw 5, this simultaneously or successively.

Comme illustré sur la figure 3, l'axe de basculement 11 des têtes d'étirage 2 de la machine d'étirage 1 conforme à l'invention peut être utilisé de manière conventionnelle, au moyen des vérins de basculement 12, pour faire pivoter la ligne de mors 5, par exemple sur un secteur angulaire a de l'ordre de 30°.As illustrated on the figure 3 , the tilting axis 11 of the drawing heads 2 of the drawing machine 1 according to the invention can be used conventionally, by means of the tilt cylinders 12, to rotate the jaw line 5, by example on an angular sector has of the order of 30 °.

Par exemple, comme on peut le voir sur la figure 4, partant d'une cote de hauteur x à l'horizontale des lignes de mors 5 (pouvant correspondre à une position minimum basse de la ligne de mors), la machine d'étirage 1 peut être adaptée pour faire pivoter lesdites ligne de mors 5 entre un angle négatif b (par exemple de l'ordre de 5 à 10°) et un angle positif c (par exemple de l'ordre de 5 à 30°).For example, as can be seen on the figure 4 starting from a dimension of height x horizontally of the jaw lines 5 (which may correspond to a minimum low position of the jaw line), the stretching machine 1 may be adapted to rotate said jaw lines 5 between a negative angle b (for example of the order of 5 to 10 °) and a positive angle c (for example of the order of 5 to 30 °).

Partant de cette position minimum basse du châssis 10, la gestion de l'axe de basculement complémentaire 13 par les vérins de basculement complémentaires 14, permet d'élever l'axe de basculement 11, comme illustré sur les figures 5 et 6 :

  • pour obtenir une inclinaison du châssis 10, et donc de la ligne de mors 5 (figure 5), ou encore
  • pour réaliser une compensation de bords sur la tôle (figure 6).
Starting from this low minimum position of the chassis 10, the management of the complementary tilting axis 13 by the complementary tilt cylinders 14 makes it possible to raise the tilting axis 11, as illustrated in FIGS. Figures 5 and 6 :
  • to obtain an inclination of the frame 10, and therefore of the jaw line 5 ( figure 5 ), or
  • to perform edge compensation on the sheet ( figure 6 ).

On peut aussi obtenir une position maximum haute horizontale de la ligne de mors 5, comme illustré sur la figure 7 (la cote de hauteur x + Δ x de la ligne de mors 5 sur la figure 7 étant supérieure à la cote x de la figure 4).It is also possible to obtain a maximum horizontal high position of the jaw line 5, as illustrated in FIG. figure 7 (the height dimension x + Δ x of the jaw line 5 on the figure 7 being greater than the x-coordinate of the figure 4 ).

Toute autre gestion combinée de l'axe de basculement 11 et de l'axe de basculement complémentaire 13 peut être mise en oeuvre.Any other combined management of the tilting axis 11 and the complementary tilt axis 13 can be implemented.

D'une manière générale :

  • les vérins de basculement complémentaires 14 permettent de lever ou d'abaisser l'axe de basculement 11 pour ajuster le niveau des lignes de mors 5, et permettent la mise en oeuvre combinée ou non d'une opération de compensation de bord ;
  • les vérins de basculement 12 permettent le basculement des supports des lignes de mors 5 en fonction de l'étirage recherché, et permettent de compenser l'action des vérins de basculement complémentaires 14 ;
  • les vérins d'étirage 9 sont utilisés pour étirer la tôle et/ou pour compenser l'effet de rotation des supports de lignes de mors (afin notamment de conserver la distance entre les deux lignes de mors).
In a general way :
  • the complementary tilt cylinders 14 make it possible to raise or lower the tilting axis 11 to adjust the level of the jaw lines 5, and allow the combined implementation or not of an edge compensation operation;
  • the tilt cylinders 12 allow the tilting of the supports of the jaw lines 5 according to the desired stretching, and make it possible to compensate the action complementary tilt cylinders 14;
  • the drawing cylinders 9 are used to stretch the sheet and / or to compensate for the rotation effect of the jaw line supports (in particular to maintain the distance between the two jaw lines).

Selon une variante de réalisation illustrée sur les figures 8 et 9, le châssis porteur de la structure support 8 est monté sur le bâti support 3 par l'intermédiaire de moyens qui permettent son déplacement parallèlement à lui-même le long d'un axe vertical.According to an embodiment variant illustrated on the Figures 8 and 9 , the carrier frame of the support structure 8 is mounted on the support frame 3 by means which allow its displacement parallel to itself along a vertical axis.

Ces moyens de déplacement consistent alors avantageusement en un châssis 10' en forme de chariot coulissant verticalement le long de glissières 15 solidaires du bâti mobile 31, et actionné par au moins un vérin hydraulique 14'. Par exemple deux vérins hydrauliques 14' sont placés de part et d'autre du chariot 10'. Le ou les vérins 14' peuvent être placés en bas ou en haut du bâti mobile 31.These displacement means then advantageously consist of a chassis 10 'in the form of a carriage sliding vertically along slides 15 integral with the movable frame 31, and actuated by at least one hydraulic cylinder 14'. For example two hydraulic cylinders 14 'are placed on either side of the carriage 10'. The cylinder (s) 14 'can be placed at the bottom or at the top of the mobile frame 31.

La fonction montée/descente du châssis support 8 et donc de la ligne de mors 5 est effectuée en agissant directement sur l'axe de basculement 11 placé sur le châssis coulissant 10'. La cote de hauteur x + Δ x de la ligne de mors 5 sur la figure 9 est supérieure à la cote x sur la figure 8.The up / down function of the support frame 8 and therefore of the jaw line 5 is performed by acting directly on the tilting axis 11 placed on the sliding frame 10 '. The height dimension x + Δ x of the jaw line 5 on the figure 9 is greater than the x rating on the figure 8 .

Pour ce mode de réalisation également, des moyens de commande sont adaptés pour gérer le déplacement des vérins de basculement 12 et du chariot avec guidage vertical, en fonction de la position spatiale souhaitée des lignes de mors 5, cela en simultané ou successivement.For this embodiment also, control means are adapted to manage the displacement of the tilt cylinders 12 and the carriage with vertical guidance, depending on the desired spatial position of the jaw lines 5, that simultaneously or successively.

La machine d'étirage longitudinal conforme à l'invention présente les avantages suivants :

  • évite la présence de rehausses réglables en hauteur sur l'outil de formage (outillage et mise en oeuvre simplifiés),
  • augmente la possibilité de réglage,
  • permet de conformer la tôle au plus près de l'outil,
  • meilleure versatilité pour le formage,
  • possibilité de compensation de bord(s) pendant le formage,
  • possibilité d'ajuster les angles et les hauteurs pendant le formage.
The longitudinal stretching machine according to the invention has the following advantages:
  • avoids the presence of height-adjustable extensions on the forming tool (simplified tooling and implementation),
  • increases the possibility of adjustment,
  • makes it possible to conform the sheet as close as possible to the tool,
  • better versatility for forming,
  • possibility of compensation of edge (s) during forming,
  • ability to adjust angles and heights during forming

Claims (10)

  1. Machine for forming sheets by longitudinal stretching,
    said machine (1) comprises two stretch heads (2) located on either side of a forming tool (4) for the sheet,
    said stretch heads (2) each comprising a line of grippers (5) integral with a support structure (8) which is associated with means of stretching (9) and which is mounted on a chassis (10, 10') by the intermediary of a tipping axis (11),
    at least one tipping cylinder (12) being inserted between said chassis (10, 10') and said support structure (8), in order to allow for the maneuvering in rotation of said support structure (8) about said tipping axis (11),
    and said chassis (10, 10') being carried by a support frame (3), characterized in that it comprises means (13, 14; 15, 14'), inserted between said support frame (3) and said chassis (10, 10'), arranged to allow for an adjustment of the vertical positioning of said tipping axis (11).
  2. Machine according to claim 1, characterized in that said chassis (10) is mounted on said support frame (3) by the intermediary of a complementary tipping axis (13), parallel or substantially parallel to said tipping axis (11), at least one complementary tipping cylinder (14) being inserted between said chassis (10) and said support frame (3) in order to allow for the maneuver in rotation of said chassis (10) about said complementary tipping axis (13) and as such allows for the adjusting of the vertical positioning of said tipping axis (11).
  3. Machine according to claim 2, characterized in that said tipping axis (11) and said complementary tipping axis (13) extend horizontally or substantially horizontally.
  4. Machine according to claim 2 or 3, characterized in that the complementary tipping axis (13) is located on the opposite side of the tipping axis (11) with respect to the associated line of grippers (5).
  5. Machine according to claim 1, characterized in that said chassis (10') is mounted on said support frame (3) by the intermediary of means (15, 14') which allow for the displacement thereof in relation to said support frame (3) parallel to itself along a vertical axis.
  6. Machine according to claim 5, characterized in that said chassis (10') consists of a vertically sliding carriage, mounted on vertical sliders (15) and maneuvered by one or several cylinders (14').
  7. Machine according to any one of claim 1 to 6, characterized in that said support frame (3) comprises:
    - a movable frame portion (31), that carries said means for adjusting (10, 13, 14; 10', 14', 15) the vertical positioning of the tipping axis (11), and
    - a base frame portion (32),
    said movable frame portion (31) being mounted mobile in translation on said base frame portion (32), along a direction perpendicular to said tipping axis (11) and to said complementary tipping axis (13).
  8. Machine according to claim 7, characterized in that it comprises a base frame portion (32) which is common to the two stretch heads (2, 2') and which is used as a support for the forming tool (4).
  9. Machine according to any one of claims 1 to 8, characterized in that it comprises control means suitable for managing the displacement of said tipping cylinder or cylinders (12) and of said means (10, 13, 14; 10', 15, 14') for adjusting the vertical positioning of the tipping axis (11), according to the desired spatial position of the lines of grippers (5).
  10. Method for implementing a machine according to claim 9, characterized in that it consists in managing the displacement of said tipping cylinder or cylinders (12) and of said means (10, 13, 14; 10', 14', 15) for adjusting the vertical positioning of the tipping axis (11), according to the desired spatial position of the lines of grippers (5).
EP17306795.0A 2016-12-19 2017-12-18 Sheet metal forming machine by longitudinal stretching and method using such a machine Active EP3335813B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17306795T PL3335813T3 (en) 2016-12-19 2017-12-18 Sheet metal forming machine by longitudinal stretching and method using such a machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1662713A FR3060425B1 (en) 2016-12-19 2016-12-19 LONGITUDINAL STRETCH SHAPE FORMING MACHINE

Publications (2)

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EP3335813A1 EP3335813A1 (en) 2018-06-20
EP3335813B1 true EP3335813B1 (en) 2019-07-17

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EP17306795.0A Active EP3335813B1 (en) 2016-12-19 2017-12-18 Sheet metal forming machine by longitudinal stretching and method using such a machine

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US (1) US10940519B2 (en)
EP (1) EP3335813B1 (en)
DK (1) DK3335813T3 (en)
ES (1) ES2755186T3 (en)
FR (1) FR3060425B1 (en)
PL (1) PL3335813T3 (en)
PT (1) PT3335813T (en)

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Publication number Priority date Publication date Assignee Title
IT201900008889A1 (en) * 2019-06-13 2020-12-13 Danieli Off Mecc IRONING MACHINE FOR EXTRUDED PROFILES

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299689A (en) * 1964-05-18 1967-01-24 Cyril Bath Co Method and apparatus for combined stretch forming and die drawing
US3302437A (en) * 1964-06-22 1967-02-07 Cyril Bath Co Tension control
US3314269A (en) * 1966-08-12 1967-04-18 Cyril Bath Co Prestretch fixture and combination thereof with drawing die press
US3459025A (en) * 1967-12-07 1969-08-05 Cyril Bath Co Stretching fixture with quadrilateral linkage control of stretch head movements
FR2038831A5 (en) * 1969-03-31 1971-01-08 Bretagne Atel Chantiers
US3595057A (en) * 1969-04-15 1971-07-27 Cyril Bath Co Stretcher for stretch forming sheet and plate stock
DE10042197B4 (en) * 2000-08-28 2005-04-07 Schuler Held Lasertechnik Gmbh & Co. Kg Laser stretch-stretching processing device for sheet metal parts and methods
FR2886178B1 (en) * 2005-05-24 2010-05-07 Acb METHOD FOR FORMING A LONGITUDINAL AND TRANSVERSE DOUBLE GALB SHEET, AND A LONGITUDINAL STRETCHING PRESS FOR THE IMPLEMENTATION OF THE METHOD
WO2011041984A1 (en) * 2009-10-09 2011-04-14 吉林大学 Multiple clamp type stretching and forming machine

Non-Patent Citations (1)

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Title
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EP3335813A1 (en) 2018-06-20
PL3335813T3 (en) 2020-06-15
FR3060425B1 (en) 2019-05-17
ES2755186T3 (en) 2020-04-21
US10940519B2 (en) 2021-03-09
DK3335813T3 (en) 2019-10-21
PT3335813T (en) 2019-10-30
US20180169731A1 (en) 2018-06-21
FR3060425A1 (en) 2018-06-22

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