EP1726377B1 - Method for forming a double longitudinally and transversally curved sheet, and longitudinal stretch forming press for carrying out the method - Google Patents
Method for forming a double longitudinally and transversally curved sheet, and longitudinal stretch forming press for carrying out the method Download PDFInfo
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- EP1726377B1 EP1726377B1 EP20060300517 EP06300517A EP1726377B1 EP 1726377 B1 EP1726377 B1 EP 1726377B1 EP 20060300517 EP20060300517 EP 20060300517 EP 06300517 A EP06300517 A EP 06300517A EP 1726377 B1 EP1726377 B1 EP 1726377B1
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- jaw
- stretching
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- axis
- jaws
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- 238000000034 method Methods 0.000 title claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 11
- 230000010355 oscillation Effects 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 241000287107 Passer Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229940082150 encore Drugs 0.000 description 1
- 235000020004 porter Nutrition 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Classifications
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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
- B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die
Definitions
- the present invention relates to the general field of forming metal sheets by means of drawing presses. It relates more particularly to an original process for shaping a sheet with a longitudinal and transverse double curve, as well as the longitudinal drawing press allowing the implementation of this method (see for example US-A-4,698,995 ).
- Longitudinal stretching presses conventionally consist of two jaw lines arranged facing each other, intended to grip the edges of the width of the sheet that is to be shaped. 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 sheet that is desired.
- the jaw lines vis-à-vis are each associated with actuating cylinders to adapt their positioning in space and to implement the stretching function.
- the present invention aims to obtain, as of the initial stretching operation, shaped sheet metal parts having a certain homogeneity of the stresses and deformations internal to the metal structure, thus avoiding the multiplication of the drawing passes, with the inherent phases of handling and conformation of the metal by heat treatment.
- the method according to the invention consists, at the during the drawing maneuver and after having curved said jaw lines, to create a differential traction movement between the central jaw and the peripheral jaws of said jaw lines, this by a pivoting of the front plane of said jaw lines around the jaw lines; a horizontal axis parallel to this front plane, this in such a sense, during the drawing action, to perform a greater displacement of the peripheral jaws than the central jaw, keeping a constant direction of stretching, adapted way to tend to standardize the drawing state on the surface of the sheet.
- This differential traction movement makes it possible to generate a drawing with an edge compensation effect.
- the longitudinal stretching press comprises a press frame receiving a forming tool placed between two lines of curvaceous stretching jaws arranged opposite, said lines of jaws being carried by mechanical means allowing their combined movement vertically, horizontally, as well as pivoting about a horizontal axis parallel to the front plane of said jaw lines,
- each jaw line of the press being carried by a pivot disposed in a vertical plane; the upper part of this pivot, which extends above the jaw line, being secured to at least one upper drawing cylinder arranged parallel to the direction of stretching, and the lower part of this pivot, which is extends beneath said jaw line, being secured to at least one lower drawing cylinder, also arranged parallel to the drawing direction, said lower and upper drawing jacks imparting horizontal and vertical displacement components to said jaw line; pivoting.
- the attachment of the upper and lower draw cylinders with the ends of the pivot is achieved by means of mechanical structures of the kind ball joints.
- each stretching assembly consisting of the jaw line, the support pivot of the jaw line and the upper and lower drawing jacks, is pivotally mounted on the press frame around a horizontal axis. perpendicular to the direction of stretching, which drawing assembly is subjected to the action of at least one so-called “tilting" jack, arranged parallel to the direction of stretching, which tilt cylinder provides said jaw line with a component of vertical displacement.
- a rocker structure connects the upper drawing cylinder and the lower drawing cylinder.
- This rocker is pivotally mounted about the horizontal tilt axis between the upper and lower draw cylinders, and is subject to the action of the tilt cylinder.
- the body of the upper drawing cylinder is fixed rigidly on the balance structure, and the body of the lower drawing cylinder is hingedly attached to said balance structure; on the other hand, this rocker structure is extended by a lower extension, under the lower drawing cylinder, which extension forms a structure for anchoring and actuating the tilting cylinder.
- the tilt cylinder is hingedly attached to the lower extension of the rocker structure, as well as to the press frame (or on a movable carriage mounted on the press frame).
- the longitudinal stretching press comprises at least one so-called “oscillation” jack adapted to allow pivoting of the pivot which supports the jaw line, about its longitudinal axis.
- This oscillation jack is advantageously connected, on the one hand, to the support of the drawing cylinders, and on the other hand, to the support pivot of the jaw line, these connections being made by means of mechanical structures of the ball-and-socket type.
- the press comprises means for rotating the jaw lines about an axis perpendicular to their front plane and passing through their central jaw.
- at least one jack is interposed between the support pivot of the jaw line and an extension of the axis of rotation of the jaw line, for manipulating said line of jaws in rotation.
- two jacks are used to perform this rotational maneuver. These two cylinders are arranged on either side of the axis of rotation of the jaw line; they are mounted hinged at the ends of extensions integral with the axis of rotation of the jaw line, and the support pivot of this line of jaws.
- the jaw lines consist of a juxtaposition of jaws each rotatable about an axis perpendicular to the front plane of said jaw lines.
- Each jaw is connected to the jaw juxtaposed by a link structure, and each of these jaws is equipped with a gear portion centered on said axis of rotation.
- the gears of the different jaws juxtaposed cooperate with each other, manipulated by appropriate mechanical means, to position at will each jaw relative to its neighbor, and thus position said line of jaws curved position or negative, as needed.
- the support pivot of the jaw line carries said jaw line via the axis of the central jaw which passes through it.
- the means for operating the jaws consist of jacks interposed between extensions of the toothed wheels of two jaw juxtaposed.
- the longitudinal stretching press for metal sheets according to the invention illustrated on the Figures 1 to 5 , consists mainly of a frame 1 at both ends of which are placed two stretching heads 2, identical or similar, arranged vis-à-vis. On the Figures 1 to 3 only the drawing head on the left has been shown.
- one of the drawing heads 2 is fixedly mounted on the frame 1; the other head is carried by a movable carriage 3 guided on said frame 1, to allow adjustment of their spacing.
- a forming tool simply schematized in 4 on the figure 1 , is positioned and fixed on the frame 1 between the two drawing heads 2.
- the active face of this forming tool 4 is adapted according to the final shape of the sheet metal parts that it is desired to obtain.
- Each drawing head 2 consists of a line of jaws 5 carried by mechanical means adapted to give it the desired spatial movements. These particular mechanical means will be detailed below in connection with the figure 8 in particular.
- the jaw line 5 of the drawing head 2 has the function of clamping the width edge of the worked sheet by a jaw grip.
- This line of jaws 5, here consisting of a juxtaposition of seven jaws 6, is arranged in a plane perpendicular to the direction of stretching (marked at 8 on the figure 1 ), or substantially perpendicular to this direction, to fulfill its function properly.
- 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 is placed in horizontal straight position.
- On the figure 5 it is placed in rectilinear position inclined at an angle ⁇ of the order of 15 ° relative to the horizontal.
- On the figure 6 it is positioned in an S configuration; and on the figure 7 , 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 figure 8 is a representation of the same drawing press, in the form of a block diagram detailing the means of maneuvering the jaw line 5.
- the jaw line 5 is schematically illustrated in the form of a single horizontal line positioned perpendicular to the direction of the drawing axis 8.
- the jaw line 5 is carried by a single pivot 10 disposed in a vertical plane, on the median axis of stretching 8.
- the upper part of this pivot 10, which extends above the line of jaws 5 is attached to one or more upper drawing jacks 11, and its lower part, under said jaw line 5, is attached to one or more lower drawing jacks 12.
- the upper drawing cylinders 11 and lower 12 are arranged parallel to the drawing direction 8. It is understood that through the pivot 10, they give the jaw line 5 horizontal displacement components, and also pivoting around a horizontal axis parallel to the plane of front of said jaw line 5.
- the connection of the upper drawing cylinders 11 and lower 12 with the pivot 10 is carried out by means of ball joints marked respectively 13 and 14.
- the upper drawing cylinders 11 and lower 12 are integral with a rocker 15 pivoting about a tilting axis 16, and subjected to the action of one or more tilting cylinders 17.
- the tilting axis 16 is horizontal and extends perpendicular to the drawing direction 8.
- the upper drawing cylinder 11 is fixed rigidly on the rocker structure 15, above the axis 16; on the other hand, the lower drawing jack 12 is mounted in an articulated manner on this rocker 15, around a horizontal axis 18 and perpendicular to the drawing direction 8.
- This hinge pin 18 is located under the tilting axis 16.
- the rocker structure 15 extends under the axis 18 by a lower extension 19 which forms an anchoring structure for the tilting cylinder 17.
- This tilting cylinder 17 extends parallel to the axis of stretching 8; to actuate the balance 15, it is hingedly attached to the extension 19 of said rocker 15, and on the press frame 1 (the corresponding joints are perpendicular to the axis of stretching 8).
- the drawing assembly consisting of the jaw line 5, the pivot 10 and the upper drawing cylinders 11 and lower 12 is pivotally mounted on the frame 1 about the axis 16, subjected to the action of the cylinder tilting 17. It will be understood that this tilt cylinder 17 gives the jaw line 5 a vertical displacement component.
- the figure 3 illustrates in particular the tilting of the drawing assembly about the axis 16, with respect to the illustrated "rest" configuration figure 1 especially.
- the jaw line 5 is rotatably mounted on the support pin 10, about an axis 20 perpendicular to the plane of the front of said jaw line 5.
- two jacks 21 are adapted to maneuver the line of jaws 5 around this axis 20, so as to ensure its tilting on one side or the other ( figure 5 ), or to maintain it in a centered position ( figures 4 , 6 and 7 ).
- the jacks 21 are disposed on either side of the axis 20 and they are mounted hinged at the end of extensions 22 and 23 integral respectively with the pivot 10 and the axis 20.
- the axis 20 extends in the vertical plane of the drawing axis 8, or substantially in this plane; it moves in a vertical plane depending on the operation of the tilting cylinder 17. This axis 20 is used according to the desired prepositioning of the leading edges of the sheet, and depending on the desired final configuration of the sheet.
- the drawing head 2 also comprises one or more oscillation cylinders 24, adapted to allow adjustment of the positioning of the jaw line 5 with respect to the edge of the sheet to be worked.
- This oscillating jack 24 is adapted to allow pivoting of the pivot 10 about its longitudinal axis 10 '; it is connected on the one hand to the rocker structure 15, and on the other hand to said pivot 10, by means of appropriate extensions, respectively 25 and 26, by means of ball joints 27, 28.
- This oscillation function makes it possible to impose an angle on the jaw line to position it according to the configuration of the sheet which may have cutouts oblique, for better stretching relative to the tool and thus limit the falling of material.
- drawing head 2 allows the implementation of various functions at the jaw line (rotation, oscillation, bending, simple or differential stretching, and tilting functions) which give the corresponding press many possibilities of work on sheet metal.
- this press can be implemented to improve the homogeneity of the drawing for the sheets with double transverse and longitudinal curve. This feature is illustrated schematically on the Figures 9 to 11 .
- the stretching function is performed by the drawing cylinders 11 and 12, in association with the tilting of the drawing assembly obtained by means of the tilting jack 17 (not shown in FIGS. Figures 9 and 10 ).
- the lower and upper cylinders are made to work differently; and in particular one draws a little less on the upper cylinder, with respect to the tension imposed on the lower cylinder.
- This feature is illustrated by the pulling arrows 31 and 32 of the figure 10 .
- the imposed difference in tension causes a slight tilting of the curved jaw lines 5 around a horizontal (non-fixed) axis parallel to the front plane of the jaw lines 5. This tilting tends to bring the upper parts of the two jaw lines 5 closer together. vis-à-vis, and tends to spread their end parts.
- the continuous differential displacement is generated in the longitudinal direction on each jaw, maximum end; the sheet is then stretched more significantly on the sides with respect to the center, which makes it possible to tend to standardize the state of stretching on the surface of the sheet.
- Stretching with corresponding edge compensation effect shown on the figure 11 where the length of the pulling arrows is representative of the movement path of the jaws is calculated and implemented on a case by case basis, depending on the curve of the sheet and the relative positions between the forming tool and the jaw lines.
- the corresponding differential stretching operation is carried out throughout the stretching operation.
- each jaw line 5 consists of a central jaw 6 'associated with peripheral jaws 6, here six in number (three distributed on either side of the jaw). central jaw 6 ').
- each jaw 6, 6 ' is rotatably mounted about its own axis perpendicular to the front plane of the jaw line 5, in link structures 33 which allow to connect them in pairs.
- the links 33 ensure the rotational guidance of each jaw 6, 6 'about its central axis and they make the connection of each jaw 6, 6' with the juxtaposed jaw ( figures 13 , 14 and 15).
- the axis of rotation of the peripheral jaws 6 is indicated by the shafts marked 6 "on the Figures 12 and 13 .
- the axis of rotation of the central jaw 6 ' is materialized by the shaft 20; in connection with the description of the figure 8 it is through this axis 20 that the pivot 10 carries the entire jaw line 5.
- This axis 20 passes through the pivot 10 via a suitable orifice; it is provided with extensions 23, not shown on the Figures 12 to 14 , which allow the implementation of the rotation function by means of the jacks 21.
- the carrier pin 10 extends in the middle of the block formed by the jaw line 5; in particular, this pivot 10 is positioned between the active part of the central jaw 6 'and the two links 33 which connect this central jaw 6' to the two peripheral jaws 6 juxtaposed.
- the axis 20 only supports the traction forces of the central jaw 6 '. All the drawing efforts of the peripheral jaws 6 are attached to the rear of the pivot 10 through the links 33 and 6 "axes.
- each jaw 6, 6 ' is equipped with a toothed wheel 34 which is centered on the axis of rotation 6 ", 20.
- the toothed wheels 34 of the juxtaposed jaws cooperate with each other, operated by jacks 35 to position at will each jaw 6, 6 'in relation to its neighbor.
- the central jaw 6 ' carries all the peripheral jaws 6 via the links 33.
- the chain or "hinge” thus formed is configured in space by means of the adjustment of the positioning of each jaw, from the central jaw 6' which serves as a reference, by means of the toothed wheels 34 and actuating cylinders 35.
- the cylinders 35 are interposed between extension tabs 36 which extend the toothed wheels 34.
- the active part of the jaws 6, 6 ' can be quite conventional; it must be adapted to ensure a safe and effective grip of the edge of the worked sheet.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
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Description
La présente invention concerne le domaine général du façonnage de tôles métalliques au moyen de presses d'étirage. Elle concerne plus particulièrement un procédé original de façonnage d'une tôle à double galbe longitudinal et transversal, ainsi que la presse d'étirage longitudinal permettant la mise en oeuvre de ce procédé (voir par exemple
Les presses d'étirage longitudinal sont classiquement constituées de deux lignes de mors disposées en vis-à-vis, destinées à agripper les bordures de largeur de la tôle que l'on souhaite conformer. 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 tôle que l'on souhaite obtenir.
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.Longitudinal stretching presses conventionally consist of two jaw lines arranged facing each other, intended to grip the edges of the width of the sheet that is to be shaped. 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 sheet that is desired.
The jaw lines vis-à-vis are each associated with actuating cylinders to adapt their positioning in space and to implement the stretching function.
Mais dans le cadre de certaines configurations de tôles, la conception actuelle des presses d'étirage longitudinal oblige l'utilisateur à réaliser deux passes d'étirage pour obtenir la pièce finie, avec une trempe intermédiaire, ce qui nécessite deux manutentions complètes de tôle par pièce.
En effet, pour la conformation de tôles à double galbe longitudinal et transversal par exemple, durant l'étirage, la limite élastique du matériau est atteinte pour les fibres du milieu, alors que les fibres extérieures sont toujours sous compression. Il est alors nécessaire d'interrompre le procédé de formage et de réaliser un traitement thermique ; l'étirage est ensuite repris et peut continuer avec une seconde passe pour éliminer les plis.
Ce phénomène résulte du procédé même mis en oeuvre, qui consiste à appliquer un déplacement uniforme à la ligne de mors, dans la direction d'étirage, alors que les bords des pièces requièrent un déplacement supérieur pour éviter le décollement de la tôle et éliminer les plis.But in the case of certain sheet configurations, the current design of the longitudinal drawing presses forces the user to perform two draw passes to obtain the finished part, with intermediate quenching, which requires two complete sheet metal handling operations. room.
In fact, for the shaping of longitudinal and transverse double-walled sheets, for example, during stretching, the elastic limit of the material is reached for the fibers of the medium, while the outer fibers are still under compression. It is then necessary to interrupt the forming process and to carry out a heat treatment; stretching is then resumed and can continue with a second pass to eliminate wrinkles.
This phenomenon results from the process itself, which consists in applying a uniform displacement to the jaw line, in the direction of stretching, while the edges of the parts require a greater displacement to avoid detachment of the sheet and eliminate the folds.
A ce jour, les pièces fabriquées selon ce mode présentent des temps de cycles longs et coûteux.To date, parts manufactured according to this mode have long and expensive cycle times.
La présente invention a pour objectif d'obtenir, dès l'opération d'étirage initiale, des pièces de tôle conformées présentant une certaine homogénéité des contraintes et déformations internes à la structure métallique, évitant ainsi la multiplication des passes d'étirage, avec les phases inhérentes de manutention et de conformation du métal par traitement thermique.The present invention aims to obtain, as of the initial stretching operation, shaped sheet metal parts having a certain homogeneity of the stresses and deformations internal to the metal structure, thus avoiding the multiplication of the drawing passes, with the inherent phases of handling and conformation of the metal by heat treatment.
Pour atteindre cet objectif, dans le but de façonner une tôle à double galbe longitudinal et transversal au moyen d'une presse d'étirage longitudinal munie d'un outil de formage disposé entre deux lignes de mors d'étirage incurvables positionnées en vis-à-vis, lesquelles lignes de mors sont manoeuvrables dans l'espace au moyen d'un ensemble de vérins, le procédé conforme à l'invention consiste, au cours de la manoeuvre d'étirage et après avoir incurvé lesdites lignes de mors, à créer un mouvement différentiel de traction entre le mors central et les mors périphériques desdites lignes de mors, ceci par un pivotement du plan de face desdites lignes de mors autour d'un axe horizontal parallèle à ce plan de face, ceci dans un sens tel, lors de l'action d'étirage, à effectuer un déplacement plus important des mors périphériques que du mors central, en gardant une direction d'étirage constante, de manière adaptée pour tendre à uniformiser l'état d'étirage sur la surface de la tôle. Ce mouvement différentiel de traction permet de générer un étirage avec effet de compensation de bord.To achieve this objective, in order to form a double longitudinal and transverse sheet metal sheet by means of a longitudinal drawing press provided with a forming tool arranged between two curved stretching jaw lines positioned opposite each other, which jaw lines are maneuvrable in space by means of a set of jacks, the method according to the invention consists, at the during the drawing maneuver and after having curved said jaw lines, to create a differential traction movement between the central jaw and the peripheral jaws of said jaw lines, this by a pivoting of the front plane of said jaw lines around the jaw lines; a horizontal axis parallel to this front plane, this in such a sense, during the drawing action, to perform a greater displacement of the peripheral jaws than the central jaw, keeping a constant direction of stretching, adapted way to tend to standardize the drawing state on the surface of the sheet. This differential traction movement makes it possible to generate a drawing with an edge compensation effect.
Encore pour atteindre l'objectif précité, la presse d'étirage longitudinal conforme à l'invention comprend un bâti de presse recevant un outil de formage placé entre deux lignes de mors d'étirage incurvables disposées en vis-à-vis, lesdites lignes de mors étant portées par des moyens mécaniques autorisant leur déplacement combiné verticalement, horizontalement, ainsi qu'en pivotement autour d'un axe horizontal parallèle au plan de face desdites lignes de mors,Still to achieve the aforementioned purpose, the longitudinal stretching press according to the invention comprises a press frame receiving a forming tool placed between two lines of curvaceous stretching jaws arranged opposite, said lines of jaws being carried by mechanical means allowing their combined movement vertically, horizontally, as well as pivoting about a horizontal axis parallel to the front plane of said jaw lines,
chaque ligne de mors de la presse étant portée par un pivot disposé dans un plan vertical ; la partie supérieure de ce pivot, qui s'étend au-dessus de la ligne de mors, étant assujettie à au moins un vérin d'étirage supérieur disposé parallèlement au sens d'étirage, et la partie inférieure de ce pivot, qui s'étend au dessous de ladite ligne de mors, étant assujettie à au moins un vérin d'étirage inférieur, également disposé parallèlement au sens d'étirage, lesdits vérins d'étirage inférieur et supérieur conférant à ladite ligne de mors des composantes de déplacement horizontal et en pivotement.
De préférence, la solidarisation des vérins d'étirage supérieur et inférieur avec les extrémités du pivot est réalisée au moyen de structures mécaniques du genre rotules.each jaw line of the press being carried by a pivot disposed in a vertical plane; the upper part of this pivot, which extends above the jaw line, being secured to at least one upper drawing cylinder arranged parallel to the direction of stretching, and the lower part of this pivot, which is extends beneath said jaw line, being secured to at least one lower drawing cylinder, also arranged parallel to the drawing direction, said lower and upper drawing jacks imparting horizontal and vertical displacement components to said jaw line; pivoting.
Preferably, the attachment of the upper and lower draw cylinders with the ends of the pivot is achieved by means of mechanical structures of the kind ball joints.
Selon une autre particularité, chaque ensemble d'étirage, constitué par la ligne de mors, le pivot support de la ligne de mors et les vérins d'étirage supérieur et inférieur, est monté basculant sur le bâti de presse autour d'un axe horizontal perpendiculaire au sens d'étirage, lequel ensemble d'étirage est soumis à l'action d'au moins un vérin, dit « de basculement », disposé parallèlement au sens d'étirage, lequel vérin de basculement confère à ladite ligne de mors une composante de déplacement vertical.According to another particularity, each stretching assembly, consisting of the jaw line, the support pivot of the jaw line and the upper and lower drawing jacks, is pivotally mounted on the press frame around a horizontal axis. perpendicular to the direction of stretching, which drawing assembly is subjected to the action of at least one so-called "tilting" jack, arranged parallel to the direction of stretching, which tilt cylinder provides said jaw line with a component of vertical displacement.
Selon encore une autre caractéristique, une structure de balancier relie le vérin d'étirage supérieur et le vérin d'étirage inférieur. Ce balancier est monté pivotant autour de l'axe horizontal de basculement situé entre les vérins d'étirage supérieur et inférieur, et il est soumis à l'action du vérin de basculement.
Dans ce cadre, le corps du vérin d'étirage supérieur est fixé de manière rigide sur la structure de balancier, et le corps du vérin d'étirage inférieur est fixé de manière articulée sur ladite structure de balancier ; d'autre part, cette structure de balancier se prolonge par une extension inférieure, sous le vérin d'étirage inférieur, laquelle extension forme une structure d'ancrage et d'actionnement du vérin de basculement.
Encore de préférence, le vérin de basculement est fixé de manière articulée sur l'extension inférieure de la structure de balancier, ainsi que sur le bâti de presse (ou sur un chariot mobile monté sur le bâti de presse).According to yet another characteristic, a rocker structure connects the upper drawing cylinder and the lower drawing cylinder. This rocker is pivotally mounted about the horizontal tilt axis between the upper and lower draw cylinders, and is subject to the action of the tilt cylinder.
In this context, the body of the upper drawing cylinder is fixed rigidly on the balance structure, and the body of the lower drawing cylinder is hingedly attached to said balance structure; on the other hand, this rocker structure is extended by a lower extension, under the lower drawing cylinder, which extension forms a structure for anchoring and actuating the tilting cylinder.
More preferably, the tilt cylinder is hingedly attached to the lower extension of the rocker structure, as well as to the press frame (or on a movable carriage mounted on the press frame).
Toujours selon une autre particularité, la presse d'étirage longitudinal conforme à l'invention comporte au moins un vérin dit « d'oscillation » adapté pour permettre le pivotement du pivot qui supporte la ligne de mors, autour de son axe longitudinal. Ce vérin d'oscillation est avantageusement lié, d'une part, au support des vérins d'étirage, et d'autre part, au pivot support de la ligne de mors, ces liaisons étant réalisées au moyen de structures mécaniques du genre rotules.Still according to another feature, the longitudinal stretching press according to the invention comprises at least one so-called "oscillation" jack adapted to allow pivoting of the pivot which supports the jaw line, about its longitudinal axis. This oscillation jack is advantageously connected, on the one hand, to the support of the drawing cylinders, and on the other hand, to the support pivot of the jaw line, these connections being made by means of mechanical structures of the ball-and-socket type.
Encore selon une disposition préférée, la presse comporte des moyens permettant la rotation des lignes de mors autour d'un axe perpendiculaire à leur plan de face et passant par leur mors central.
Dans ce cadre, au moins un vérin est interposé entre le pivot support de la ligne de mors et une extension de l'axe de rotation de la ligne de mors, pour manoeuvrer ladite ligne de mors en rotation.
Selon une forme de réalisation préférée, deux vérins sont utilisés pour réaliser cette manoeuvre en rotation. Ces deux vérins sont aménagés de part et d'autre de l'axe de rotation de la ligne de mors ; ils sont montés articulés à l'extrémité d'extensions solidaires de l'axe de rotation de la ligne de mors, et du pivot support de cette ligne de mors.Still according to a preferred arrangement, the press comprises means for rotating the jaw lines about an axis perpendicular to their front plane and passing through their central jaw.
In this context, at least one jack is interposed between the support pivot of the jaw line and an extension of the axis of rotation of the jaw line, for manipulating said line of jaws in rotation.
According to a preferred embodiment, two jacks are used to perform this rotational maneuver. These two cylinders are arranged on either side of the axis of rotation of the jaw line; they are mounted hinged at the ends of extensions integral with the axis of rotation of the jaw line, and the support pivot of this line of jaws.
Selon une autre caractéristique, les lignes de mors sont constitués d'une juxtaposition de mors chacun mobile en rotation autour d'un axe perpendiculaire au plan de face desdites lignes de mors. Chaque mors est relié au mors juxtaposé par une structure de maillons, et chacun de ces mors est équipé d'une portion de roue dentée centrée sur ledit axe de rotation. Les roues dentées des différents mors juxtaposés coopèrent entre elles, manoeuvrées par des moyens mécaniques appropriés, pour positionner à volonté chaque mors par rapport à son voisin, et ainsi positionner ladite ligne de mors en incurvation position ou négative, en fonction des besoins. En outre, le pivot support de la ligne de mors porte ladite ligne de mors via l'axe du mors central qui le traverse.
De préférence, les moyens de manoeuvre des mors sont constitués de vérins interposés entre des extensions des roues dentées de deux mors juxtaposés.According to another characteristic, the jaw lines consist of a juxtaposition of jaws each rotatable about an axis perpendicular to the front plane of said jaw lines. Each jaw is connected to the jaw juxtaposed by a link structure, and each of these jaws is equipped with a gear portion centered on said axis of rotation. The gears of the different jaws juxtaposed cooperate with each other, manipulated by appropriate mechanical means, to position at will each jaw relative to its neighbor, and thus position said line of jaws curved position or negative, as needed. In addition, the support pivot of the jaw line carries said jaw line via the axis of the central jaw which passes through it.
Preferably, the means for operating the jaws consist of jacks interposed between extensions of the toothed wheels of two jaw juxtaposed.
L'invention sera encore illustrée, sans être aucunement limitée, par la description suivante d'un mode de réalisation particulier, donné uniquement à titre d'exemple et représenté sur les dessins annexés dans lesquels :
- la
figure 1 est une vue de côté d'une presse d'étirage longitudinal conforme à l'invention, sur laquelle seule l'une des têtes d'étirage a été représentée ; - la
figure 2 est une vue de dessus de la presse d'étirage illustrée sur lafigure 1 ; - la
figure 3 est une vue de côté de la presse desfigures 1 et 2 , illustrant le basculement de la tête d'étirage ; - la
figure 4 est une vue en perspective de la tête d'étirage de la presse illustrée sur lesfigures 1 à 3 ; - la
figure 5 est une vue similaire à lafigure 4 , montrant une autre configuration rectiligne possible de la ligne de mors des têtes d'étirage ; - les
figures 6 et 7 illustrent encore deux autres configurations possibles de la ligne de mors des têtes d'étirage, ici en incurvation ; - la
figure 8 est un schéma fonctionnel de la presse d'étirage longitudinal desfigures 1 à3; - la
figure 9 est une vue schématique, en perspective, qui illustre l'étirage d'une tôle à double galbe au moyen de la presse conforme à l'invention ; - la
figure 10 est une vue partielle, de côté, de la structure illustréefigure 9 , qui montre l'opération d'étirage de la tôle, et en particulier l'étirage différentiel conforme à l'invention ; - la
figure 11 est une vue en perspective d'une tôle à double galbe soumise à l'opération d'étirage différentiel ; - la
figure 12 est une vue de dessus de la ligne de mors de la presse conforme à l'invention, montrant la solidarisation des différents mors juxtaposés ; - la
figure 13 est une vue schématique en coupe selon 13-13 de lafigure 12 , montrant les moyens de manoeuvre des différents mors juxtaposés ; - la
figure 14 est une vue en perspective de la ligne de mors montrant une possibilité de configuration des différents mors.
- the
figure 1 is a side view of a longitudinal drawing press according to the invention, in which only one of the drawing heads has been shown; - the
figure 2 is a top view of the drawing press illustrated on thefigure 1 ; - the
figure 3 is a side view of the press of theFigures 1 and 2 illustrating the tilting of the drawing head; - the
figure 4 is a perspective view of the press stretching head illustrated on theFigures 1 to 3 ; - the
figure 5 is a view similar to thefigure 4 , showing another possible rectilinear configuration of the jaw line of the drawing heads; - the
Figures 6 and 7 illustrate two other possible configurations of the line of jaws of the drawing heads, here in curvature; - the
figure 8 is a block diagram of the longitudinal stretch pressfigures 1 to3; - the
figure 9 is a schematic view, in perspective, which illustrates the drawing of a double-curved sheet metal by means of the press according to the invention; - the
figure 10 is a partial view, from the side, of the illustrated structurefigure 9 which shows the stretching operation of the sheet, and in particular the differential stretching according to the invention; - the
figure 11 is a perspective view of a double-curved sheet subjected to the differential drawing operation; - the
figure 12 is a top view of the line of jaws of the press according to the invention, showing the joining of the juxtaposed jaws; - the
figure 13 is a schematic sectional view along 13-13 of thefigure 12 , showing the maneuvering means of the juxtaposed jaws; - the
figure 14 is a perspective view of the jaw line showing a possibility of configuration of the different jaws.
La presse d'étirage longitudinal pour tôles métalliques conforme à l'invention, illustrée sur les
Sur les
On the
De manière classique, l'une des têtes d'étirage 2 est montée fixe sur le bâti 1 ; l'autre tête est portée par un chariot mobile 3 guidé sur ledit bâti 1, pour permettre un réglage de leur écartement.Conventionally, one of the
Un outil de formage, simplement schématisé en 4 sur la
Chaque tête d'étirage 2 est constituée d'une ligne de mors 5 portée par des moyens mécaniques adaptés pour lui conférer les mouvements spatiaux recherchés. Ces moyens mécaniques particuliers seront détaillés ci-après en relation avec la
La ligne de mors 5 de la tête d'étirage 2 a pour fonction de brider la bordure de largeur de la tôle travaillée, par une prise en mors. Cette ligne de mors 5, ici constituée d'une juxtaposition de sept mors 6, est disposée dans un plan perpendiculaire au sens d'étirage (repéré en 8 sur la
Chaque ligne de mors 5 comprend des moyens permettant sa mise en configuration rectiligne, incurvée (concave ou convexe), ou encore en S.
Sur les
Each
On the
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.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
La
Sur cette
On this
Les moyens de manoeuvre de cette ligne de mors 5 (et également ceux de la ligne de mors en vis-à-vis), sont adaptés pour remplir les différentes fonctions suivantes :
- étirer la tôle afin d'atteindre la limite d'élasticité du matériau, puis passer dans le domaine plastique des déformations permanentes ;
- imposer une variation d'angle, au départ de 90°, entre le plan de face de la ligne de mors et l'axe d'étirage, ceci pour
- la conservation de la tangence tôle/outil durant toute la phase d'étirage, et
- la possibilité, lorsque la ligne de mors présente une incurvation, de pratiquer un étirage différentiel progressif entre le centre de la ligne de mors et sa périphérie, qui permet de porter toutes les fibres de la tôle dans un même état d'étirage, dans le domaine plastique.
- imposer un angle avec l'horizontale à la ligne d'étirage afin de conserver la tôle tangente à l'outil fixe tout au long de la phase d'étirage ;
- imposer un angle dans le plan horizontal, d'axe vertical ou sensiblement vertical (fonction oscillation), permettant de positionner la ligne de mors en fonction du format de la tôle brute, pouvant présenter des découpes obliques.
- stretch the sheet to reach the elastic limit of the material, then pass into the plastic field permanent deformations;
- impose a variation of angle, starting from 90 °, between the front plane of the jaw line and the drawing axis, this for
- the conservation of tangency sheet / tool during the entire drawing phase, and
- the possibility, when the line of jaws has a curvature, to practice a progressive differential stretching between the center of the jaw line and its periphery, which makes it possible to bring all the fibers of the sheet in the same state of stretching, in the plastic field.
- impose an angle with the horizontal at the drawing line in order to keep the sheet tangent to the fixed tool throughout the stretching phase;
- impose an angle in the horizontal plane, vertical or substantially vertical axis (oscillation function), for positioning the jaw line according to the size of the blank sheet, which may have oblique cutouts.
Pour cela, la ligne de mors 5 est portée par un pivot unique 10 disposé dans un plan vertical, sur l'axe médian d'étirage 8. La partie supérieure de ce pivot 10, qui s'étend au-dessus de la ligne de mors 5 est assujettie à un ou plusieurs vérins d'étirage supérieurs 11, et sa partie inférieure, sous ladite ligne de mors 5, est assujettie à un ou plusieurs vérins d'étirage inférieurs 12.
Les vérins d'étirage supérieur 11 et inférieur 12 sont disposés parallèlement au sens d'étirage 8. On comprend que par l'intermédiaire du pivot 10, ils confèrent à la ligne de mors 5 des composantes de déplacement horizontale, et aussi en pivotement autour d'un axe horizontal parallèle au plan de face de ladite ligne de mors 5.
La liaison des vérins d'étirage supérieur 11 et inférieur 12 avec le pivot 10 est réalisée au moyen de rotules repérées respectivement 13 et 14.For this, the
The
The connection of the
Les vérins d'étirage supérieur 11 et inférieur 12 sont solidaires d'un balancier 15 pivotant autour d'un axe de basculement 16, et soumis à l'action d'un ou de plusieurs vérins de basculement 17. L'axe de basculement 16 est horizontal et il s'étend perpendiculairement au sens d'étirage 8.The
Le vérin d'étirage supérieur 11 est fixé de manière rigide sur la structure de balancier 15, au-dessus de l'axe 16 ; en revanche, le vérin d'étirage inférieur 12 est monté de manière articulée sur ce balancier 15, autour d'un axe 18 horizontal et perpendiculaire au sens d'étirage 8. Cet axe d'articulation 18 est situé sous l'axe de basculement 16.
La structure de balancier 15 se prolonge sous l'axe 18 par une extension inférieure 19 qui forme une structure d'ancrage pour le vérin de basculement 17. Ce vérin de basculement 17 s'étend parallèlement à l'axe d'étirage 8 ; pour actionner le balancier 15, il est fixé de manière articulée sur l'extension 19 dudit balancier 15, ainsi que sur le bâti de presse 1 (les articulations correspondantes sont perpendiculaires à l'axe d'étirage 8).The
The
L'ensemble d'étirage, constitué par la ligne de mors 5, le pivot 10 et les vérins d'étirage supérieur 11 et inférieur 12 est monté basculant sur le bâti 1 autour de l'axe 16, soumis à l'action du vérin de basculement 17.
On comprend alors que ce vérin de basculement 17 confère à la ligne de mors 5 une composante de déplacement vertical.
La
It will be understood that this
The
Sur la
L'axe 20 s'étend dans le plan vertical de l'axe d'étirage 8, ou sensiblement dans ce plan ; il évolue dans un plan vertical en fonction de la manoeuvre du vérin de basculement 17. Cet axe 20 est utilisé en fonction du prépositionnement souhaité des bords d'attaque de la tôle, et en fonction de la configuration finale souhaitée de la tôle.The
D'autre part, la tête d'étirage 2 comporte également un ou plusieurs vérins d'oscillation 24, apte(s) à permettre le réglage du positionnement de la ligne de mors 5 par rapport à la bordure de la tôle à travailler. Ce vérin d'oscillation 24 est adapté pour permettre le pivotement du pivot 10 autour de son axe longitudinal 10' ; il est relié d'une part à la structure de balancier 15, et d'autre part audit pivot 10, par l'intermédiaire d'extensions appropriées, respectivement 25 et 26, ceci au moyen de rotules 27, 28.
Cette fonction oscillation permet d'imposer un angle à la ligne de mors pour la positionner en fonction de la configuration de la tôle qui peut présenter des découpes obliques, pour un meilleur étirage par rapport à l'outil et limiter ainsi les chutes de matériau.On the other hand, the drawing
This oscillation function makes it possible to impose an angle on the jaw line to position it according to the configuration of the sheet which may have cutouts oblique, for better stretching relative to the tool and thus limit the falling of material.
Cette structure particulière de tête d'étirage 2 permet la mise en oeuvre de différentes fonctions au niveau de la ligne de mors (fonctions rotation, oscillation, incurvation, étirage simple ou différentiel, et basculement) qui confèrent à la presse correspondante de nombreuses possibilités de travail sur la tôle.This particular structure of drawing
En particulier, cette presse peut être mise en oeuvre pour améliorer l'homogénéité de l'étirage pour les tôles à double galbe transversal et longitudinal.
Cette particularité est illustrée schématiquement sur les
This feature is illustrated schematically on the
Sur les
Les deux lignes de mors 5 sont incurvées afin de permettre à la tôle d'être plaquée contre l'outil pendant sa phase d'étirage, et pour limiter les chutes de matière.On the
The two
La fonction d'étirage est réalisée par les vérins d'étirage 11 et 12, en association avec le basculement de l'ensemble d'étirage obtenu au moyen du vérin de basculement 17 (non représenté sur les
Pour obtenir l'étirage homogène ou quasi homogène recherché, malgré le double galbe de la tôle, on fait travailler différemment les vérins inférieur et supérieur ; et en particulier on tire un peu moins sur le vérin supérieur, par rapport à la traction imposée au vérin inférieur.
Cette particularité est illustrée par les flèches de traction 31 et 32 de la
La différence de traction imposée provoque un léger basculement des lignes de mors incurvées 5 autour d'un axe horizontal (non fixe) parallèle au plan de face des lignes de mors 5. Ce basculement tend à rapprocher les parties supérieures des deux lignes de mors 5 en vis-à-vis, et tend à écarter leurs parties d'extrémités. Le déplacement différentiel continu est généré dans le sens longitudinal sur chaque mors, maximum en extrémité ; on étire alors la tôle de manière plus importante sur les côtés par rapport au centre, ce qui permet de tendre à uniformiser l'état d'étirage sur la surface de la tôle.
L'étirage avec effet de compensation de bord correspondant, illustré sur la
La manoeuvre d'étirage différentiel correspondante est mise en oeuvre tout au long de l'opération d'étirage.In order to obtain the homogeneous or almost uniform stretching required, despite the double curve of the sheet, the lower and upper cylinders are made to work differently; and in particular one draws a little less on the upper cylinder, with respect to the tension imposed on the lower cylinder.
This feature is illustrated by the pulling
The imposed difference in tension causes a slight tilting of the
Stretching with corresponding edge compensation effect, shown on the
The corresponding differential stretching operation is carried out throughout the stretching operation.
Le résultat est une répartition plus uniforme des contraintes ; on arrive ainsi à obtenir des tôles « finies » en pouvant économiser une passe, et/ou en pouvant économiser de la matière par limitation des chutes.The result is a more uniform distribution of constraints; thus, it is possible to obtain "finished" sheets by being able to save a pass, and / or by being able to save material by limiting falls.
Dans le cadre de la presse d'étirage illustrée sur les figures, chaque ligne de mors 5 est constituée d'un mors central 6' associé à des mors périphériques 6, ici au nombre de six (trois répartis de part et d'autre du mors central 6').In the context of the drawing press illustrated in the figures, each
Comme détaillé sur les
L'axe de rotation des mors périphériques 6 est matérialisé par les arbres repérés 6" sur les
Sur la
Comme on peut le voir schématiquement sur la
Le mors central 6' porte tous les mors périphériques 6 par l'intermédiaire des maillons 33. La chaîne ou « charnière » ainsi formée est configurée dans l'espace au moyen du réglage du positionnement de chaque mors, à partir du mors central 6' qui sert de référence, par l'intermédiaire des roues dentées 34 et des vérins de manoeuvre 35.
Pour assurer leur fonction, les vérins 35 sont interposés entre des pattes d'extension 36 qui prolongent les roues dentées 34.As can be seen schematically on the
The
To ensure their function, the
On comprend, dès lors, qu'il est alors possible de positionner la ligne de mors 5 de manière rectiligne (
La partie active des mors 6, 6' peut être tout-à-fait classique ; elle devra être adaptée pour assurer une prise sûre et efficace de la bordure de la tôle travaillée.The active part of the
On notera en outre la possibilité de prévoir un outil de formage mobile en translation verticale. Dans ce cas, le mouvement de cet outil peut être combiné à celui des têtes d'étirage pour obtenir l'étirage avec effet de compensation de bord recherché.Note also the possibility of providing a mobile forming tool in vertical translation. In this case, the movement of this tool can be combined with that of the drawing heads to achieve stretching with the desired edge compensation effect.
Claims (14)
- A method of shaping a sheet (30) having a double longitudinal and transverse curvature, by means of a longitudinal stretching press provided with a forming tool (4) arranged between two bendable lines of stretching jaws (5), arranged opposite to each other, wherein said jaw lines (5) are operable in space by means of a set of cylinders (11, 12, 17, 21, 24), characterized in that it consists, during the stretching operation and after said jaw lines (5) have been bent, in creating a differential movement of traction between the central jaw (6') and the peripheral jaws (6) of said jaw lines (5), by pivoting the front plane of said jaw lines (5) around a horizontal axis parallel to this front plane, in such a direction that, during the stretching action, a greater displacement of said peripheral jaws (6) than that of said central jaw (6') is obtained, while keeping a constant stretching direction, in such a way to tend to make the stretching state uniform over the surface of said sheet (30).
- A longitudinal stretching press for metal sheets, comprising a press frame (1) receiving a forming tool (4) placed between two bendable lines of stretching jaws (5), arranged opposite to each other and supported by mechanical means (10, 11, 12, 15, 17) permitting the combined displacement thereof vertically, horizontally and rotationally around a horizontal axis parallel to the front plane of said jaw lines (5), characterized in that each jaw line (5) is supported by a pivot (10) arranged in a vertical plane, wherein the upper part of said pivot (10), which extends above said jaw lines (5), is secured to at least one upper stretching cylinder (11) arranged parallel to the stretching direction (8), and the lower part of said pivot (10), which extends below said jaw line (5), is secured to at least one lower stretching cylinder (12), also arranged parallel to the stretching direction (8), said lower (12) and upper (11) stretching cylinders providing said jaw line (5) with horizontal and rotational displacement components.
- A longitudinal stretching press according to claim 2, characterized in that the assembly of the upper (11) and lower (12) stretching cylinders with the ends of the pivot (10) is made by means of ball-joint type mechanical structures (13, 14).
- A longitudinal stretching press according to any one of claims 2 or 3, characterized in that each stretching unit (2) comprised of the jaw line (5), the pivot (10) supporting said jaw line (5) and the upper (11) and lower (12) stretching cylinders, is tiltably mounted to the press frame (1), around a horizontal axis (16) perpendicular to the stretching direction (8), wherein said stretching unit (2) is subjected to the action of at least one cylinder (17), referred to as the "tilting cylinder", arranged parallel to said stretching direction (8), said tilting cylinder (17) providing said jaw lines (5) with a vertical displacement component.
- A longitudinal stretching press according to claim 4, characterized in that it comprises a pendulum structure (15) connecting the upper stretching cylinder (11) and the lower stretching cylinder (12), wherein said pendulum (15) is pivotably mounted around the horizontal axis of tilting (16) located between said upper (11) and lower (12) stretching cylinders, and wherein said pendulum (15) is subjected to the action of the tilting cylinder (17).
- A longitudinal stretching press according to claim 5, characterized in that the body of the upper stretching cylinder (11) is rigidly fixed to the pendulum structure (15), and in that the body of the lower stretching cylinder (12) is hingedly fixed to said pendulum structure (15), wherein said pendulum structure (15) is extended by a lower extension (19), below said lower stretching cylinder (12), said extension (19) forming a structure for anchoring and operating the tilting cylinder (17).
- A longitudinal stretching press according to claim 6, characterized in that the tilting cylinder (17) is hingedly fixed to the lower extension (19) of the pendulum (15) and to the press frame (1).
- A longitudinal stretching press according to any one of claims 2 to 7, characterized in that it comprises at least one cylinder (24), referred to as the "oscillation cylinder", adapted to permit the pivoting of the pivot (10) supporting the jaw line (5) around its longitudinal axis (10').
- A longitudinal stretching press according to claim 8, characterized in that the oscillation cylinder (24) is connected, on the one hand, to the support (15) of the stretching cylinders (11, 12), and on the other hand, to the pivot (10) supporting the jaw line (5), these connections being made by means of ball-joint type mechanical structures (27, 28).
- A longitudinal stretching press according to any one of claims 2 to 9, characterized in that it comprises means (21, 22, 23) for the rotation of the jaw lines (5) around an axis (20) perpendicular to the front plane of said jaw lines (5) and passing through the central jaw (6') of said jaw lines (5).
- A longitudinal stretching press according to claim 10, characterized in that it comprises at least one cylinder (21) interposed between the pivot (10) supporting the jaw line (5) and an extension (23) of the axis of rotation (20) of the jaw line (5), to operate said jaw line (5) in rotation around said axis (20).
- A longitudinal stretching press according to claim 11, characterized in that it comprises two cylinders (21) for rotationally operating the jaw line (5), said cylinders (21) being arranged on either side of the axis of rotation (20), hingedly mounted at the end of extensions (23, 22) integral with said axis of rotation (20) and with the pivot (10) supporting said jaw line (5).
- A longitudinal stretching press according to any one of claims 2 to 12, characterized in that the jaw lines (5) consist of a juxtaposition of jaws (6, 6'), each being mobile in rotation around a central axis (6", 20) perpendicular to the front plane of said jaw lines (5), wherein each of said jaws (6, 6') is connected to the juxtaposed jaw by a chain-link structure (33), and each of said jaws (6, 6') is equipped with a toothed wheel (34) centred on said axis of rotation (6", 20), said toothed wheels (34) of the different juxtaposed jaws (6, 6') cooperating with each other and being operated by suitable mechanical means to position at will each jaw (6, 6') with respect to its neighbour, and then to position said jaw line (5) according to a positive or negative curvature, as needed, wherein the pivot (10) supporting said jaw line (5) supports said jaw line (5) via the axis (20) of the central jaw (6') that passes through it.
- A longitudinal stretching press according to claim 13, characterized in that the means for operating the jaws (6, 6') consist of cylinders (35) interposed between extensions (38) of the toothed wheels (34) of two juxtaposed jaws (6, 6').
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0505205A FR2886178B1 (en) | 2005-05-24 | 2005-05-24 | METHOD FOR FORMING A LONGITUDINAL AND TRANSVERSE DOUBLE GALB SHEET, AND A LONGITUDINAL STRETCHING PRESS FOR THE IMPLEMENTATION OF THE METHOD |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1726377A1 EP1726377A1 (en) | 2006-11-29 |
EP1726377B1 true EP1726377B1 (en) | 2011-08-24 |
Family
ID=35478362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20060300517 Active EP1726377B1 (en) | 2005-05-24 | 2006-05-24 | Method for forming a double longitudinally and transversally curved sheet, and longitudinal stretch forming press for carrying out the method |
Country Status (2)
Country | Link |
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EP (1) | EP1726377B1 (en) |
FR (1) | FR2886178B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101450365B (en) * | 2007-11-29 | 2010-06-02 | 江南造船(集团)有限责任公司 | One-time pressure-molding technique for marine water-jet propulsion passage aluminum double curved plate |
FR3060425B1 (en) | 2016-12-19 | 2019-05-17 | Acb | LONGITUDINAL STRETCH SHAPE FORMING MACHINE |
CN113020388B (en) * | 2021-02-08 | 2023-03-10 | 中国重型机械研究院股份公司 | Four-degree-of-freedom transverse skin stretcher |
CN113020387B (en) * | 2021-02-08 | 2023-03-10 | 中国重型机械研究院股份公司 | Skin stretcher with three transfer and one transfer characteristics |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4706486A (en) * | 1986-02-03 | 1987-11-17 | L & F Industries | Jaw assembly for stretch press |
US4698995A (en) * | 1986-05-28 | 1987-10-13 | Chorneau Frederick R | Method for stretch forming drop hammer parts utilizing stretch wrap forming techniques |
JPH06246361A (en) * | 1993-02-24 | 1994-09-06 | Mitsui Eng & Shipbuild Co Ltd | Stretch former |
DE10245317B4 (en) * | 2002-09-27 | 2005-02-03 | Audi Ag | Method for stretch bending an elongated profile component and stretch bending device for carrying out the method |
-
2005
- 2005-05-24 FR FR0505205A patent/FR2886178B1/en not_active Expired - Fee Related
-
2006
- 2006-05-24 EP EP20060300517 patent/EP1726377B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
FR2886178A1 (en) | 2006-12-01 |
EP1726377A1 (en) | 2006-11-29 |
FR2886178B1 (en) | 2010-05-07 |
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