EP2500115A1 - Method for shaping very thick mechanically welded sheets and structure obtained by said method - Google Patents

Method for shaping very thick mechanically welded sheets and structure obtained by said method Download PDF

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Publication number
EP2500115A1
EP2500115A1 EP12156603A EP12156603A EP2500115A1 EP 2500115 A1 EP2500115 A1 EP 2500115A1 EP 12156603 A EP12156603 A EP 12156603A EP 12156603 A EP12156603 A EP 12156603A EP 2500115 A1 EP2500115 A1 EP 2500115A1
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European Patent Office
Prior art keywords
groove
sheet
folded
key
planes
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EP12156603A
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German (de)
French (fr)
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EP2500115B1 (en
Inventor
Christian Prybilski
Nicolas Villar
Edmond Linas
Bruno Lathuilière
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Nexter Systems SA
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Nexter Systems SA
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Priority to PL12156603T priority Critical patent/PL2500115T3/en
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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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/08—Bending by altering the thickness of part of the cross-section of the work

Definitions

  • the technical field of the invention is that of folding processes of thick sheets and in particular the folding of sheets intended to form part of a mechanically welded structure of a shielded vehicle.
  • the patent GB2197810 proposes a method of shaping sheets to make enclosures or technical cabinets.
  • This patent teaches machining at least one groove in the sheet perpendicular to the fold direction.
  • the groove thus made causes a reduction in the thickness of the sheet which allows easier folding.
  • This solution is well suited for the realization of technical cabinets for which the thickness of the sheet is reduced and the problem of ballistic resistance does not arise.
  • This solution is however not transferable to the field of folding of thick sheets, particularly for sheets for the realization of vehicle structures and for which the ballistic continuity of the structure is essential. Indeed, if the thickness of the sheet is less in the corners, it will be all the easier to perforate by a projectile.
  • the structure in general is weakened at the level of the fold.
  • the invention proposes to solve this problem by practicing a groove of a particular type which has a recess in its bottom.
  • the planes defining the groove can be brought into contact during bending or the groove can accommodate a key corresponding to the plans of the groove.
  • the thickness of material at the corner thus created will be at least equal to the thickness of the sheet.
  • the particular shape of the recess will make it possible to distribute the stresses generated by the folding.
  • the invention has the main advantage of providing a method for obtaining acceptable ballistic continuity.
  • the invention also has the advantage of allowing reduced radii of curvature to be obtained.
  • the invention also has the advantage of precisely positioning the folding operation while simplifying the implementation of this operation.
  • the invention makes it possible to obtain a geometrical precision of the folded part which avoids post-bending machining.
  • the invention also has the advantage of distributing the folding stresses.
  • the recess comprises a bulge at the bottom of the groove.
  • the groove is delimited by two intersecting planes (V-groove).
  • the sheet is folded so that the planes delimiting the groove bear against one another and then the outer edges of the groove are secured by at least one weld bead.
  • a key having surfaces intended to come into contact after folding with the planes delimiting the groove is positioned at the level of the groove, then the sheet is folded to bring the planes delimiting the groove resting on the corresponding surfaces of the key, and finally the outer edges of the groove are secured with the key by at least one weld bead.
  • the sheet may be folded such that the groove and the key are within the projecting angle formed by the folded sheet.
  • the sheet may be folded so that the groove and the key are outside the projecting angle formed by the folded sheet.
  • the key may include two lateral flanges covering the sheet.
  • the groove after folding may be delimited by two parallel planes.
  • the invention also relates to a mechanically welded structure, in particular for a body of a vehicle, characterized in that it comprises at least one sheet shaped by the method according to one of the preceding claims.
  • a thickly shielded sheet metal 1 has a groove 2 delimited by two secant lateral planes 2a and 2b forming a V open towards the outside of the groove 2.
  • This recess 3 comprises lobes 3a and 3b.
  • Each of the lobes 3a and 3b is placed partly below the respective planes 2a and 2b.
  • the lobes 3a and 3b are separated from each other by a bulge of material 3c with a thickness h greater than one millimeter relative to the bottom of the lobes 3a and 3b.
  • the planes 2a and 2b extend in a direction perpendicular to the plane of the figure 1 over the entire length of the sheet 1 to be folded. It is the same recesses 3a and 3b and 3c bulge.
  • sheet 1 which was represented flat at the figure 1 , has undergone a folding operation at 90 ° around a fold line P. This folding brought the planes 2a and 2b in abutment against each other.
  • a weld bead 4 secures the outer edges of the planes 2a and 2b over the entire length of the sheet.
  • the thickness of material contained in the total thickness M of the corner thus formed is large and close to the thickness E of the sheet.
  • the distribution of folding stresses is made at the two areas of thinned sheet 8a and 8b which are separated by the bulge 3c. This is due to the lesser thickness of material that is left by the machining of the recess 3 at the bottom of the lobes 3a and 3b.
  • the mutual support of the planes 2a and 2b provides the corner 5 thus formed with increased strength.
  • sheet 1 has the same machining and shapes as at the figure 1 and it is folded on the side of the groove 2 (the sheet is folded so that the groove is inside the projecting angle formed by the folded sheet).
  • a metal key 6 of the same material as that of the sheet is placed in the groove 2 over the entire length of the latter.
  • This key 6 comprises two surfaces 6a and 6b corresponding with the planes 2a and 2b delimiting the groove 2.
  • the outer edges of the planes 2a and 2b are secured to the key 6 by weld seams 7a and 7b.
  • the key 6 has a thickness such that it bears against the bottom of the groove 2 at the bulge 3c. This embodiment makes it possible to produce a folded sheet at an angle greater than 90 °.
  • the key 6 thus placed provides a solid structural support to the planes 2a and 2b, which reinforces the structure formed by the folding of the sheet 1.
  • the massive character of the key 6 and its thickness covering the entire depth of the groove 2 brings a ballistic continuity to the folded sheet 1.
  • the sheet 1 is folded in the opposite direction of the folding made at the figure 3 .
  • the sheet 1 is folded on the opposite side to the groove 2 (the groove 2 is thus outside the projecting angle formed by the folded sheet).
  • a key 6 occupies the open space at the groove 2.
  • the edges of the key 6 are secured to the sheet 1 by means of weld beads 7a and 7b.
  • the key 6 covers the entire length and the depth of the groove 2 and the side surfaces 6a and 6b of the key are supported on the planes 2a and 2b delimiting the groove 2. In this way the ballistic continuity is ensured as well as the strength of the structure.
  • Key 6 of the figure 4 has flanges 9a, 9b covering the sheet 1 which further improves the ballistic protection.
  • the groove 2 can be initially machined on the flat sheet 1 with a shape of V whose opening is towards the inside of the groove 2. In this way the sheet 1 can be folded until the planes 2a and 2b of the groove 2 are parallel.
  • the method according to the invention can be used to produce a complex mechano-welded structure comprising several thick plates folded in several places. It will thus be possible to make a complete box of an armored vehicle whose ballistic protection will not be reduced by the folds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Laser Beam Processing (AREA)

Abstract

The method involves machining a V-shaped groove, along a folding line (P), on a thick metal sheet (1) of a mechanically welded structure, where the groove is defined by two intersecting lateral planes (2a, 2b). A recess (3) widening the bottom of the groove is machined, where the recess comprises a bulge (3c) at the bottom of the groove. The thick metal sheet of the structure is folded along the folding line such that the intersecting planes are supported on one another.

Description

Le domaine technique de l'invention est celui des procédés de pliage des tôles de forte épaisseur et en particulier du pliage de tôles destinées à constituer une partie d'une structure mécanosoudée d'un véhicule blindé.The technical field of the invention is that of folding processes of thick sheets and in particular the folding of sheets intended to form part of a mechanically welded structure of a shielded vehicle.

La construction des véhicules blindés requiert l'usage massif de tôles de fortes épaisseurs utilisées comme éléments de carrosserie blindée ou pour former des éléments structuraux. Compte tenu de la forte épaisseur des tôles (tôles supérieure à 30 mm) la mise en forme de ces tôles par pliage est extrêmement difficile, en particulier du fait de l'énergie considérable nécessaire qui impose l'emploi de machines spéciales. En pliant la tôle sans autre préparation seuls des grands rayons de courbures sont possibles. A titre d'exemple une tôle de 40 mm d'épaisseur ne permettra pas un rayon de courbure inférieur à 120 mm.The construction of armored vehicles requires the massive use of high thickness plates used as shielded body elements or to form structural elements. Given the large thickness of the sheets (sheets greater than 30 mm) the shaping of these sheets by folding is extremely difficult, particularly because of the considerable energy required which requires the use of special machines. By folding the sheet without any other preparation, only large radii of curvature are possible. For example a sheet of 40 mm thick will not allow a radius of curvature less than 120 mm.

Le brevet GB2197810 propose un procédé de mise en forme de tôles pour réaliser des boîtiers ou armoires techniques. Ce brevet enseigne d'usiner au moins une rainure dans la tôle perpendiculairement à la direction de pliage. La rainure ainsi pratiquée occasionne une réduction de l'épaisseur de la tôle qui permet un pliage plus aisé. Cette solution est bien adaptée pour la réalisation d'armoires techniques pour lesquelles l'épaisseur de la tôle est réduite et le problème de la résistance balistique ne se pose pas. Cette solution n'est cependant pas transposable au domaine du pliage des tôles à forte épaisseur, en particulier pour les tôles destinées à la réalisation de structures de véhicules et pour lesquelles la continuité balistique de la structure est essentielle. En effet, si l'épaisseur de la tôle est moindre dans les coins, elle sera d'autant plus facile à perforer par un projectile. De plus la structure en général est affaiblie au niveau du pli.The patent GB2197810 proposes a method of shaping sheets to make enclosures or technical cabinets. This patent teaches machining at least one groove in the sheet perpendicular to the fold direction. The groove thus made causes a reduction in the thickness of the sheet which allows easier folding. This solution is well suited for the realization of technical cabinets for which the thickness of the sheet is reduced and the problem of ballistic resistance does not arise. This solution is however not transferable to the field of folding of thick sheets, particularly for sheets for the realization of vehicle structures and for which the ballistic continuity of the structure is essential. Indeed, if the thickness of the sheet is less in the corners, it will be all the easier to perforate by a projectile. In addition the structure in general is weakened at the level of the fold.

Ainsi l'invention propose de résoudre ce problème en pratiquant une rainure d'un type particulier qui comporte un évidement en son fond. Grâce à cet évidement, suivant l'angle de pliage que l'on souhaite donner à la tôle, les plans délimitant la rainure pourront être amenés en contact lors du pliage ou bien la rainure pourra accueillir de manière solidaire une clé correspondant aux plans de la rainure. De cette manière l'épaisseur de matière au niveau du coin ainsi créé sera au moins égale à l'épaisseur de la tôle. De plus la forme particulière de l'évidement va permettre de répartir les contraintes générées par le pliage.Thus the invention proposes to solve this problem by practicing a groove of a particular type which has a recess in its bottom. With this recess, depending on the angle of folding that is desired to give the sheet, the planes defining the groove can be brought into contact during bending or the groove can accommodate a key corresponding to the plans of the groove. In this way the thickness of material at the corner thus created will be at least equal to the thickness of the sheet. In addition, the particular shape of the recess will make it possible to distribute the stresses generated by the folding.

L'invention présente comme avantage principal de fournir un procédé permettant d'obtenir une continuité balistique acceptable.The invention has the main advantage of providing a method for obtaining acceptable ballistic continuity.

L'invention présente aussi comme avantage de permettre l'obtention de rayons de courbure réduits.The invention also has the advantage of allowing reduced radii of curvature to be obtained.

L'invention présente aussi l'avantage de positionner précisément l'opération de pliage tout en simplifiant la mise en oeuvre de cette opération.The invention also has the advantage of precisely positioning the folding operation while simplifying the implementation of this operation.

L'invention permet d'obtenir une précision géométrique de la pièce pliée qui évite les reprises d'usinage post-pliage.The invention makes it possible to obtain a geometrical precision of the folded part which avoids post-bending machining.

L'invention présente aussi comme avantage de répartir les contraintes de pliage.The invention also has the advantage of distributing the folding stresses.

L'invention a pour objet un procédé de mise en forme d'une tôle de forte épaisseur, comportant au moins une étape de pliage le long d'une ligne de pliure et caractérisé en ce qu'il comporte les étapes suivante :

  • on usine sur la tôle plane une rainure suivant la ligne de pliure prévue,
  • on usine ensuite un évidement élargissant le fond de la rainure,
  • on plie enfin la tôle le long de la ligne de pliure suivant l'angle de pliage souhaité.
The subject of the invention is a process for forming a sheet of high thickness, comprising at least one folding step along a fold line and characterized in that it comprises the following steps:
  • a groove is machined on the flat sheet along the fold line provided,
  • a recess widening the bottom of the groove is then machined,
  • the sheet is finally folded along the fold line according to the desired bending angle.

Avantageusement l'évidement comporte un renflement en fond de rainure.Advantageously, the recess comprises a bulge at the bottom of the groove.

Selon une caractéristique de l'invention la rainure est délimitée par deux plans sécants (rainure en V).According to one characteristic of the invention, the groove is delimited by two intersecting planes (V-groove).

Avantageusement, on plie la tôle de manière à ce que les plans délimitant la rainure soient en appui l'un sur l'autre puis on solidarise les bords externes de la rainure par au moins un cordon de soudure.Advantageously, the sheet is folded so that the planes delimiting the groove bear against one another and then the outer edges of the groove are secured by at least one weld bead.

Selon un mode particulier de réalisation de l'invention, on positionne au niveau de la rainure une clé comportant des surfaces destinées à venir en contact après pliage avec les plans délimitant la rainure, puis on plie la tôle jusqu'à amener les plans délimitant la rainure en appui sur les surfaces correspondantes de la clé, et enfin on solidarise les bords externes de la rainure avec la clé par au moins un cordon de soudure.According to a particular embodiment of the invention, a key having surfaces intended to come into contact after folding with the planes delimiting the groove is positioned at the level of the groove, then the sheet is folded to bring the planes delimiting the groove resting on the corresponding surfaces of the key, and finally the outer edges of the groove are secured with the key by at least one weld bead.

La tôle pourra être pliée de telle sorte que la rainure et la clé se trouvent à l'intérieur de l'angle saillant formé par la tôle pliée.The sheet may be folded such that the groove and the key are within the projecting angle formed by the folded sheet.

Inversement, la tôle pourra être pliée de telle sorte que la rainure et la clé se trouvent à l'extérieur de l'angle saillant formé par la tôle pliée.Conversely, the sheet may be folded so that the groove and the key are outside the projecting angle formed by the folded sheet.

Dans ce dernier cas, la clé pourra comporter deux rebords latéraux couvrant la tôle.In the latter case, the key may include two lateral flanges covering the sheet.

Selon une variante, la rainure après pliage pourra être délimitée par deux plans parallèles.According to one variant, the groove after folding may be delimited by two parallel planes.

L'invention porte également sur une structure mécanosoudée, en particulier pour une caisse d'un véhicule, caractérisée en ce qu'elle comporte au moins une tôle mise en forme par le procédé selon une des revendications précédentes.The invention also relates to a mechanically welded structure, in particular for a body of a vehicle, characterized in that it comprises at least one sheet shaped by the method according to one of the preceding claims.

L'invention sera mieux comprise à la lecture de la description suivante illustrée par les dessins annexés dans lesquels:

  • La figure 1 représente une tôle de forte épaisseur en coupe transversale par rapport à la rainure.
  • La figure 2 représente une tôle de forte épaisseur pliée à 90°.
  • La figure 3 représente en perspective une tôle selon l'invention avec une clé interne au pli.
  • La figure 4 représente de trois quarts une tôle selon l'invention avec une clé externe au pli.
The invention will be better understood on reading the following description illustrated by the appended drawings in which:
  • The figure 1 represents a thick sheet in cross section relative to the groove.
  • The figure 2 represents a thick sheet metal bent at 90 °.
  • The figure 3 represents in perspective a sheet according to the invention with a key inside the fold.
  • The figure 4 represents three quarters a sheet according to the invention with a key external to the fold.

Selon la figure 1, une tôle 1 à blindage de forte épaisseur comporte une rainure 2 délimitée par deux plans latéraux 2a et 2b sécants formant un V ouvert vers l'extérieur de la rainure 2. En fond de rainure 2 se situe un évidement 3 élargissant la rainure 2. Cet évidement 3 comporte des lobes 3a et 3b. Chacun des lobes 3a et 3b vient se placer pour partie en dessous des plans respectifs 2a et 2b. Les lobes 3a et 3b sont séparés l'un de l'autre par un renflement de matière 3c d'une épaisseur h supérieure à un millimètre par rapport au fond des lobes 3a et 3b. Les plans 2a et 2b s'étendent suivant une direction perpendiculaire au plan de la figure 1 sur toute la longueur de la tôle 1 qui doit être pliée. Il en est de même des évidements 3a et 3b et du renflement 3c.According to figure 1 a thickly shielded sheet metal 1 has a groove 2 delimited by two secant lateral planes 2a and 2b forming a V open towards the outside of the groove 2. At the bottom of the groove 2 is a recess 3 widening the groove 2. This recess 3 comprises lobes 3a and 3b. Each of the lobes 3a and 3b is placed partly below the respective planes 2a and 2b. The lobes 3a and 3b are separated from each other by a bulge of material 3c with a thickness h greater than one millimeter relative to the bottom of the lobes 3a and 3b. The planes 2a and 2b extend in a direction perpendicular to the plane of the figure 1 over the entire length of the sheet 1 to be folded. It is the same recesses 3a and 3b and 3c bulge.

Selon la figure 2, la tôle 1 qui était représentée à plat à la figure 1, a subi une opération de pliage à 90° autour d'une ligne de pliure P. Ce pliage a amené les plans 2a et 2b en appui l'un contre l'autre. Un cordon de soudure 4 solidarise les bords externes des plans 2a et 2b sur toute la longueur de la tôle.According to figure 2 , sheet 1 which was represented flat at the figure 1 , has undergone a folding operation at 90 ° around a fold line P. This folding brought the planes 2a and 2b in abutment against each other. A weld bead 4 secures the outer edges of the planes 2a and 2b over the entire length of the sheet.

On notera que l'épaisseur de matière contenue dans l'épaisseur totale M de l'encoignure ainsi formée est importante et voisine de l'épaisseur E de la tôle. La répartition des contraintes de pliage se fait au niveau des deux zones de tôle amincie 8a et 8b qui sont séparées par le renflement 3c. Ceci est dû à la moindre épaisseur de matière qui est laissée par l'usinage de l'évidement 3 au fond des lobes 3a et 3b. L'appui mutuel des plans 2a et 2b apporte au coin 5 ainsi formé une résistance accrue.It will be noted that the thickness of material contained in the total thickness M of the corner thus formed is large and close to the thickness E of the sheet. The distribution of folding stresses is made at the two areas of thinned sheet 8a and 8b which are separated by the bulge 3c. This is due to the lesser thickness of material that is left by the machining of the recess 3 at the bottom of the lobes 3a and 3b. The mutual support of the planes 2a and 2b provides the corner 5 thus formed with increased strength.

Selon la figure 3, la tôle 1 comporte les mêmes usinages et formes qu'à la figure 1 et elle est pliée du coté de la rainure 2 (la tôle est pliée de telle sorte que la rainure se trouve à l'intérieur de l'angle saillant formé par la tôle pliée). Une clé 6 métallique du même matériau que celui de la tôle est placée dans la rainure 2 sur toute la longueur de cette dernière. Cette clé 6 comporte deux surfaces 6a et 6b correspondant avec les plans 2a et 2b délimitant la rainure 2. Les bords extérieurs des plans 2a et 2b sont solidarisés avec la clé 6 par des cordons de soudure 7a et 7b. La clé 6 a une épaisseur telle qu'elle vient en appui contre le fond de la rainure 2 au niveau du renflement 3c. Ce mode de réalisation permet de réaliser une tôle pliée selon un angle supérieur à 90°.According to figure 3 sheet 1 has the same machining and shapes as at the figure 1 and it is folded on the side of the groove 2 (the sheet is folded so that the groove is inside the projecting angle formed by the folded sheet). A metal key 6 of the same material as that of the sheet is placed in the groove 2 over the entire length of the latter. This key 6 comprises two surfaces 6a and 6b corresponding with the planes 2a and 2b delimiting the groove 2. The outer edges of the planes 2a and 2b are secured to the key 6 by weld seams 7a and 7b. The key 6 has a thickness such that it bears against the bottom of the groove 2 at the bulge 3c. This embodiment makes it possible to produce a folded sheet at an angle greater than 90 °.

La clé 6 ainsi placée vient fournir un appui structurel solide aux plans 2a et 2b, ce qui renforce la structure formée par le pliage de la tôle 1. Avantageusement le caractère massif de la clé 6 et son épaisseur couvrant toute la profondeur de la rainure 2 apporte une continuité balistique à la tôle pliée 1.The key 6 thus placed provides a solid structural support to the planes 2a and 2b, which reinforces the structure formed by the folding of the sheet 1. Advantageously the massive character of the key 6 and its thickness covering the entire depth of the groove 2 brings a ballistic continuity to the folded sheet 1.

Selon un autre mode de réalisation représenté à la figure 4, la tôle 1 est pliée en sens inverse du pliage réalisé à la figure 3. En d'autres termes, la tôle 1 est pliée du coté opposé à la rainure 2 (la rainure 2 se trouve ainsi à l'extérieur de l'angle saillant formé par la tôle pliée). Une clé 6 vient occuper l'espace ouvert au niveau de la rainure 2. Les bords de la clé 6 sont solidarisés avec la tôle 1 au moyen de cordons de soudure 7a et 7b. On notera qu'à l'instar du mode de réalisation de la figure 3, la clé 6 couvre toute la longueur et la profondeur de la rainure 2 et les surfaces latérales 6a et 6b de la clé sont en appui sur les plans 2a et 2b délimitant la rainure 2. De cette manière la continuité balistique est assurée ainsi que la solidité de la structure. La clé 6 de la figure 4 comporte des rebords 9a, 9b couvrants la tôle 1 ce qui améliore encore la protection balistique.According to another embodiment shown in figure 4 , the sheet 1 is folded in the opposite direction of the folding made at the figure 3 . In other words, the sheet 1 is folded on the opposite side to the groove 2 (the groove 2 is thus outside the projecting angle formed by the folded sheet). A key 6 occupies the open space at the groove 2. The edges of the key 6 are secured to the sheet 1 by means of weld beads 7a and 7b. It will be noted that of the embodiment of the figure 3 , the key 6 covers the entire length and the depth of the groove 2 and the side surfaces 6a and 6b of the key are supported on the planes 2a and 2b delimiting the groove 2. In this way the ballistic continuity is ensured as well as the strength of the structure. Key 6 of the figure 4 has flanges 9a, 9b covering the sheet 1 which further improves the ballistic protection.

Dans le cas d'une tôle pliée à l'opposé de la rainure 2 comme sur la figure 4, la rainure 2 peut être initialement usinée sur la tôle 1 plane avec une forme de V dont l'ouverture est vers l'intérieur de la rainure 2. De cette manière la tôle 1 peut être pliée jusqu'à ce que les plans 2a et 2b de la rainure 2 soient parallèles.In the case of a sheet folded opposite the groove 2 as on the figure 4 , the groove 2 can be initially machined on the flat sheet 1 with a shape of V whose opening is towards the inside of the groove 2. In this way the sheet 1 can be folded until the planes 2a and 2b of the groove 2 are parallel.

On peut mettre en oeuvre le procédé selon l'invention pour réaliser une structure mécanosoudée complexe comportant plusieurs tôles épaisses pliées en plusieurs endroits. On pourra ainsi réaliser une caisse complète d'un véhicule blindé dont la protection balistique ne sera pas diminuée par les pliures.The method according to the invention can be used to produce a complex mechano-welded structure comprising several thick plates folded in several places. It will thus be possible to make a complete box of an armored vehicle whose ballistic protection will not be reduced by the folds.

Claims (10)

Procédé de mise en forme d'une tôle (1) de forte épaisseur, comportant au moins une étape de pliage le long d'une ligne de pliure (P) et caractérisé en ce qu'il comporte les étapes suivante : on usine sur la tôle (1) plane une rainure (2) suivant la ligne de pliure (P) prévue, on usine ensuite un évidement (3) élargissant le fond de la rainure (2), on plie enfin la tôle (1) le long de la ligne (P) de pliure suivant l'angle de pliage souhaité. Process for shaping a sheet (1) of great thickness, comprising at least one folding step along a fold line (P) and characterized in that it comprises the following steps: a groove (2) is machined on the plate (1) along the fold line (P) provided, a recess (3) widening the bottom of the groove (2) is then machined, the sheet (1) is finally folded along the fold line (P) according to the desired folding angle. Procédé de mise en forme d'une tôle (1) de forte épaisseur selon la revendication 1, caractérisé que l'évidement (3) comporte un renflement (3c) en fond de rainure (2).Process for forming a thick sheet (1) according to claim 1, characterized in that the recess (3) comprises a bulge (3c) at the bottom of the groove (2). Procédé de mise en forme d'une tôle (1) de forte épaisseur selon une des revendications 1 ou 2, caractérisé en que la rainure (2) est délimitée par deux plans (2a et 2b) sécants (rainure en V).Process for forming a thick sheet (1) according to one of claims 1 or 2, characterized in that the groove (2) is delimited by two intersecting planes (2a and 2b) (V-groove). Procédé de mise en forme d'une tôle (1) de forte épaisseur selon la revendication 3, caractérisé en que : on plie la tôle (1) de manière à ce que les plans (2a et 2b) délimitant la rainure (2) soient en appui l'un sur l'autre, on solidarise les bords externes de la rainure (2) par au moins un cordon de soudure (4). Process for forming a thick sheet (1) according to claim 3, characterized in that: the sheet (1) is folded so that the planes (2a and 2b) delimiting the groove (2) bear against one another, the outer edges of the groove (2) are secured by at least one weld bead (4). Procédé de mise en forme d'une tôle (1) de forte épaisseur selon la revendication 3, caractérisé en ce que : on positionne au niveau de la rainure (2) une clé (6) comportant des surfaces (6a et 6b) destinées à venir en contact après pliage avec les plans (2a et 2b) délimitant la rainure (2), on plie la tôle (1) jusqu'à amener les plans (2a et 2b) délimitant la rainure (2) en appui sur les surfaces (6a et6b) correspondantes de la clé (6), on solidarise les bords externes de la rainure (2) avec la clé (6) par au moins un cordon (4) de soudure. Process for forming a thick sheet (1) according to claim 3, characterized in that : at the level of the groove (2) is positioned a key (6) having surfaces (6a and 6b) intended to come into contact after folding with the planes (2a and 2b) delimiting the groove (2), the sheet (1) is folded until the planes (2a and 2b) delimiting the groove (2) bear against the corresponding surfaces (6a and 6b) of the key (6), the outer edges of the groove (2) are secured with the key (6) by at least one weld bead (4). Procédé de mise en forme d'une tôle (1) de forte épaisseur selon la revendication 5, caractérisé en ce que la tôle (1) est pliée de telle sorte que la rainure (2) et la clé (6) se trouvent à l'intérieur de l'angle saillant formé par la tôle (1) pliée.Process for forming a thick sheet (1) according to Claim 5, characterized in that the sheet (1) is folded such that the groove (2) and the key (6) are at least one the interior of the salient angle formed by the folded sheet (1). Procédé de mise en forme d'une tôle (1) de forte épaisseur selon la revendication 5, caractérisé en ce que la tôle (1) est pliée de telle sorte que la rainure (2) et la clé (6) se trouvent à l'extérieur de l'angle saillant formé par la tôle (1) pliée.Process for forming a thick sheet (1) according to Claim 5, characterized in that the sheet (1) is folded such that the groove (2) and the key (6) are at least one outside the projecting angle formed by the folded sheet (1). Procédé de mise en forme d'une tôle (1) de forte épaisseur selon la revendication 7, caractérisé en ce que la clé (6) comporte deux rebords latéraux couvrant la tôle (1).Process for forming a thick sheet (1) according to claim 7, characterized in that the key (6) has two lateral flanges covering the sheet (1). Procédé de mise en forme d'une tôle (1) de forte épaisseur selon une des revendications 7 ou 8, caractérisé en ce que la rainure (2) après pliage est délimitée par deux plans parallèles (2a et 2b).A method of shaping a sheet (1) of large thickness according to one of claims 7 or 8, characterized in that the groove (2) after folding is delimited by two parallel planes (2a and 2b). Structure mécanosoudée, en particulier pour une caisse d'un véhicule, caractérisée en ce qu'elle comporte au moins une tôle (1) mise en forme par le procédé selon une des revendications précédentes.Mechanically welded structure, in particular for a body of a vehicle, characterized in that it comprises at least one sheet (1) shaped by the method according to one of the preceding claims.
EP12156603.8A 2011-03-14 2012-02-22 Method for shaping very thick mechanically welded sheets and structure obtained by said method Active EP2500115B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12156603T PL2500115T3 (en) 2011-03-14 2012-02-22 Method for shaping very thick mechanically welded sheets and structure obtained by said method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1100766A FR2972653B1 (en) 2011-03-14 2011-03-14 PROCESS FOR SHAPING HIGH-THICK WELDED MECANO SHEETS AND STRUCTURE OBTAINED THEREBY

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EP2500115A1 true EP2500115A1 (en) 2012-09-19
EP2500115B1 EP2500115B1 (en) 2013-10-02

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DK (1) DK2500115T3 (en)
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CN102933059A (en) * 2012-11-08 2013-02-13 昆山万禾精密电子有限公司 Monitor support and preparation method thereof
CN102933060A (en) * 2012-11-13 2013-02-13 昆山万禾精密电子有限公司 Support device of electronic device display module and preparation method

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CN104439975A (en) * 2014-11-28 2015-03-25 吴中区光福华宇钣金厂 Processing technology of supports
US11766828B2 (en) * 2020-07-15 2023-09-26 Spirit Aerosystems, Inc. Method of manufacturing folded structure with additive features

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GB2197810A (en) 1986-09-22 1988-06-02 Jackson Paul Adrian Southon Sheet metal articles
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CN102933060A (en) * 2012-11-13 2013-02-13 昆山万禾精密电子有限公司 Support device of electronic device display module and preparation method

Also Published As

Publication number Publication date
FR2972653B1 (en) 2013-03-15
DK2500115T3 (en) 2013-12-16
FR2972653A1 (en) 2012-09-21
PL2500115T3 (en) 2014-03-31
EP2500115B1 (en) 2013-10-02

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