EP2138246B1 - Tube manufactured from a planar blank and method of manufacturing such a tube - Google Patents

Tube manufactured from a planar blank and method of manufacturing such a tube Download PDF

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Publication number
EP2138246B1
EP2138246B1 EP09163818A EP09163818A EP2138246B1 EP 2138246 B1 EP2138246 B1 EP 2138246B1 EP 09163818 A EP09163818 A EP 09163818A EP 09163818 A EP09163818 A EP 09163818A EP 2138246 B1 EP2138246 B1 EP 2138246B1
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EP
European Patent Office
Prior art keywords
tube
blank
strip
edges
edge
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EP09163818A
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German (de)
French (fr)
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EP2138246A1 (en
Inventor
Georges Teixeira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Noiseene D'outillage De Presse Ste
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Noiseene D'outillage De Presse Ste
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Application filed by Noiseene D'outillage De Presse Ste filed Critical Noiseene D'outillage De Presse Ste
Priority to PL09163818T priority Critical patent/PL2138246T3/en
Priority to SI200930028T priority patent/SI2138246T1/en
Publication of EP2138246A1 publication Critical patent/EP2138246A1/en
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Publication of EP2138246B1 publication Critical patent/EP2138246B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/108—Making tubes with riveted seams or with non-welded and non-soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers

Definitions

  • the invention relates to a tube according to the preamble of claim 1 (see eg BE-A-525 415 ), made from a plastically deformable material, such as metal, in the form of a blank or a strip.
  • Tubes of this type are already known, which have the characteristic characteristic that the longitudinal edges facing the tube are joined by a welding bead to give the tube rigidity and resistance against mechanical stresses. These tubes have the disadvantage that the welding operation after the formation of the tube is a relatively delicate additional operation and thus makes more expensive the manufacturing process of such tubes.
  • the invention aims to overcome this disadvantage.
  • the invention is characterized in that the tube comprises at least one fastening lug or other member, which is made in the form of an outgrowth of the folded area of a tube edge.
  • the two edges are folded.
  • the fold is made either inwardly or outwardly of the section of the tube.
  • the section of the tube is uniform over its entire length.
  • a tube 1 according to the invention has the feature that it is made from a blank made of plastically deformable material, in particular a blank sheet of steel, by stamping or profiling and that the edges 2 facing the tube, which extend substantially longitudinally, therefore at least approximately parallel to a longitudinal axis of the tube, are formed by folding a zone of matter towards the body of the tube, or inwards, as shown by Figures 1 and 2 outward, in accordance with the figure 3 , thus forming flanges 3.
  • the tube is open over its entire length, it still has good rigidity and resistance against any type of mechanical stress due to the flanges 3.
  • edges with their edges 3 evolves according to the resistance to be achieved.
  • the edges may have different shapes and the flanges 3 are not necessarily flat and glued against the main section of the tube.
  • the flanges 3 of a tube 100 may be extended by protrusions in the form of fastening lugs 5 and 6, obtained by folding the section towards the outside. of the tube, at the free outer edge 7 of a flange 3.
  • the rim of the tube 200 may be in the form of a continuous strip which extends over the entire length or only a part thereof.
  • the rim could also be discontinuous along the length of the tube.
  • the tube may still have several areas struck, punched or cut in various places. Both ends of the tube may be straight or have different shapes.
  • the tubes according to the invention are particularly well suited for use in the domain of the automobile and can be used very advantageously for the production of dashboard crossmembers, door stiffeners, shock impactors, shock absorbers, beams, crossbars front and rear bumpers and the like. Both ends of the tube may be straight, as shown in the drawings, or have an evolutionary shape.
  • a tube according to the invention is made by stamping from a blank, for example a steel sheet.
  • a blank for example a steel sheet.
  • the pieces or blanks of sheet metal are cut from a strip of steel which is unwound from a not shown reel and brought to the automatic press whose figure 5 schematically shows the structure by a view from above.
  • This press which carries the general reference 10 comprises a number of sectors of workstations each of which performs a specific function and each blank or piece of sheet metal passes through successively.
  • the blanks cut from the original and successively converted into a tube hang up to each other in order to be able to ensure a precisely controlled transport, step by step, of a tool sector to the other and within each sector from one workstation to another.
  • the strip of steel for example 12 noted comprises along its longitudinal edges transport control points 13 regularly distributed, each between two blanks and then tubes being formed. It can be seen that even after cutting a blank, it remains connected to the previous blank and the next blank by a material bridge 14 at a control point 13.
  • the press 10 comprises, in the direction of travel of the band 12 indicated by an arrow F, first of all a cutting sector 15 blanks in the band, which, in the example shown, comprises two cutting stations.
  • the press makes two rectilinear cuts perpendicular to the X axis of the strip, each starting from the place which will subsequently constitute a front end of the tube, of a predetermined length in the direction of the axis, the part between these two cuts remaining intact.
  • the next cutting station 18 cuts the remaining portions of the blank contour, except for the bridges 14, as indicated by the cutting lines of the front ends 19 parallel to the direction of travel of the web and the cutting line 20 of the area between the two cuts 17 made at the first station.
  • the cutting sector 15 succeeds a vacuum station 22 in which the blank noted now 23, is completely cut, of course with the exception of the bridges 14 of attachment.
  • the press then comprises, in the example shown, a bending post sector 26, which comprises two bending stations 27, 28 and a crushing bending station 29.
  • the edges 3 are folded in this position at an angle slightly greater than 90 °.
  • the flanges are bent to an angle of about 145 ° and at the third bending crimping station 29, the flanges 3 are entirely folded and pressed against the upper surface of the blank 23.
  • the bending sector 25 follows the driving sector 32. In this sector, which comprises three rolling stations 33, 34, 35 the blank 23 with the folded edges 3 is transformed into a cylindrical tube as shown in the figure 1 .
  • the invention makes it possible to give the edges facing the tube any desired shape.
  • the invention makes it possible to provide on the tube fastening lugs of other members, such as lugs 5 and 6, which are made in the stamping press.
  • fastening lugs do not need to be attached to the tube, after its manufacture, during an additional operation, for example by welding.
  • the figure 7 represents a tube 200 according to a second variation of embodiment of the invention.
  • the tube 200 is made, like the tube 100, from a blank made of a plastically deformable material, especially a sheet steel blank, by stamping or profiling and with fixing lugs 5, 6.
  • the tube 200 differs from the tube 100 in that it comprises a flange 3A from which are formed fastening lugs 5, 6 and a flange 3B with notches or cuts corresponding to the material necessary to form the fastening lugs 5, 6.
  • the figure 8 schematically represents how this variant embodiment affects the cutting blanks in a steel strip.
  • Two successive blanks 201, 202 are cut with an edge 2A having protrusions giving the fixing lugs 5, 6 and with an edge 2B having cutouts 51, 61 corresponding to the material of the legs 5, 6. It is therefore clearly visible that the second embodiment allows to cut, to dimensions of the tube and legs equal, from a given steel roll, many more tubes 200 than 100 tubes.
  • the figure 9 represents steps (a) to (g) of the production of a tube 100 or 200 according to the invention. As schematically shows figure 9 it is sufficient to configure the fastening lugs 5, 6 appropriately with respect to the fold 3, before the bending operation to have the shape of the fastening lugs 5 or 6 according to the figure 4 or the figure 7 .
  • the invention also makes it possible to provide on the tube, a piece, tabs at the front ends by a suitable cut of the blank and the shaping of these tabs before the rolling operation of the blank to obtain the open tube according to the invention .
  • the figure 10 illustrates, by way of example, the application of the invention for producing a dashboard cross member of a vehicle.
  • the crossbar comprises two tubes according to the invention, namely a tube 1 without mounting tabs and a tube 200 with mounting tabs mounting in the vehicle environment.
  • the figure 11 shows for different tube configurations, the relationship between the stiffness of the tube under the effect of contact force, as a function of time. On the ordinate of this figure is reported the contact energy EC while the axis 6 is the axis of the flow of time t.
  • the rigidity calculations that allowed the tubes to be made were made using RADIOSS naming software.
  • the figure 11 shows four curves: in A the curve of a tube according to the invention whose rim is folded on the outside of the tube, in B the curve of a tube according to the invention with the fold inwards, in C the curve of a tube obtained from a blank but closed by a weld bead and at D the curve of an open tube without a flange.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Resistance Heating (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Glass Compositions (AREA)

Abstract

The tube (100) has fixation tabs (5, 6) realized in the form of excrescence projected from a folded rim (3) in one of two opposite edges (2) of the tube, where the tube is opened on its entire length and made of plastically deformable blank such as steel blank. The zone is folded towards a wall of the tube. The opposite edges are extended parallel to a longitudinal axis of the tube, where shapes of the edges are changed according to the resistance to be obtained. An independent claim is also included for a method for fabricating a tube.

Description

L'invention concerne un tube selon le préambule de la revendication 1 (voir e.g. BE-A-525 415 ), réalisé à partir d'un matériau plastiquement déformable, tel que du métal, se présentant sous la forme d'un flan ou d'une bande.The invention relates to a tube according to the preamble of claim 1 (see eg BE-A-525 415 ), made from a plastically deformable material, such as metal, in the form of a blank or a strip.

On connaît déjà des tubes de ce type, qui présentent la caractéristique typique que les bords longitudinaux en regard du tube sont réunis par un cordon de soudage pour conférer au tube de la rigidité et de la résistance contre des sollicitations mécaniques. Ces tubes présentent l'inconvénient que l'opération de soudage après la formation du tube constitue une opération supplémentaire relativement délicate et rend donc plus onéreux le procédé de fabrication de tels tubes.Tubes of this type are already known, which have the characteristic characteristic that the longitudinal edges facing the tube are joined by a welding bead to give the tube rigidity and resistance against mechanical stresses. These tubes have the disadvantage that the welding operation after the formation of the tube is a relatively delicate additional operation and thus makes more expensive the manufacturing process of such tubes.

L'invention a pour but de pallier cet inconvénient.The invention aims to overcome this disadvantage.

Pour atteindre ce but, l'invention est caractérisée en ce que le tube comporte au moins une patte de fixation ou un autre organe, qui est réalisé sous la forme d'une excroissance de la zone repliée d'un bord de tube.To achieve this object, the invention is characterized in that the tube comprises at least one fastening lug or other member, which is made in the form of an outgrowth of the folded area of a tube edge.

Selon une caractéristique supplémentaire de l'invention, les deux bords sont repliés.According to a further feature of the invention, the two edges are folded.

Selon encore une autre caractéristique, le repli est fait soit vers l'intérieur soit vers l'extérieur de la section du tube.According to yet another characteristic, the fold is made either inwardly or outwardly of the section of the tube.

Selon une autre caractéristique avantageuse de l'invention, la section du tube est uniforme sur toute sa longueur.According to another advantageous characteristic of the invention, the section of the tube is uniform over its entire length.

L'invention sera mieux comprise, et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement dans la description explicative qui va suivre et qui est faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels :

  • la figure 1 est une vue en perspective d'un tube ouvert aux bords en regard repliés selon l'invention ;
  • la figure 2 est une vue illustrant une section transversale du tube selon la figure 1, les bords étant repliés vers l'intérieur ;
  • la figure 3 est une vue similaire à la figure 2 du tube selon l'invention, les bords étant repliés vers l'extérieur ;
  • la figure 4 est une vue en perspective d'un tube selon l'invention pourvu de pattes de fixation ;
  • la figure 5 est une vue de dessus illustrant schématiquement une presse automatique de formage par emboutissage des tubes selon l'invention ;
  • la figure 6 est une vue schématique illustrant différentes étapes du processus de formage par emboutissage sous la presse automatique selon la figure 5 ;
  • la figure 7 est une vue en perspective d'un tube pourvu de pattes de fixation, selon une variante de réalisation de l'invention ;
  • la figure 8 est une vue de dessus, par extrait, d'une bande d'un matériau plastiquement déformable avec des découpes pour réaliser des tubes selon la figure 7 ;
  • la figure 9 est une vue schématique illustrant différentes étapes du processus de formage par emboutissage d'un tube selon les figures 4 et 7 ;
  • la figure 10 est une vue en perspective d'une traverse de planche de bord incorporant un tube selon l'invention ; et
  • la figure 11 est un diagramme représentant la résistance mécanique d'un tube selon l'invention comparé à la résistance d'un tube classique.
The invention will be better understood, and other objects, features, details and advantages thereof will appear more clearly in the explanatory description which follows and which is made with reference to the attached schematic drawings given only in by way of example illustrating an embodiment of the invention and in which:
  • the figure 1 is a perspective view of an open tube with the folded edges facing according to the invention;
  • the figure 2 is a view illustrating a cross section of the tube according to the figure 1 the edges being folded inwards;
  • the figure 3 is a view similar to the figure 2 tube according to the invention, the edges being folded outwards;
  • the figure 4 is a perspective view of a tube according to the invention provided with fastening tabs;
  • the figure 5 is a top view schematically illustrating an automatic press for forming by stamping tubes according to the invention;
  • the figure 6 is a schematic view illustrating different stages of the stamping forming process under the automatic press according to the figure 5 ;
  • the figure 7 is a perspective view of a tube provided with fixing lugs, according to an alternative embodiment of the invention;
  • the figure 8 is a top view, by extract, of a strip of a plastically deformable material with cutouts for producing tubes according to the figure 7 ;
  • the figure 9 is a schematic view illustrating different stages of the process of forming by stamping a tube according to the figures 4 and 7 ;
  • the figure 10 is a perspective view of a dashboard crossmember incorporating a tube according to the invention; and
  • the figure 11 is a diagram representing the mechanical strength of a tube according to the invention compared to the resistance of a conventional tube.

Comme on le voit sur la figure 1 , un tube 1 selon l'invention présente la particularité qu'il est réalisé à partir d'un flan en un matériau plastiquement déformable, notamment un flan de tôle d'acier, par emboutissage ou par profilage et que les bords 2 en regard du tube, qui s'étendent sensiblement longitudinalement, donc au moins approximativement parallèlement à un axe longitudinal du tube, sont formées par repliage d'une zone de matière vers le corps du tube, soit vers l'intérieur, comme le montrent les figures 1 et 2 , soit vers l'extérieur, conformément à la figure 3 , en formant ainsi des rebords 3. Ainsi, le tube bien que ouvert sur toute sa longueur, présente quand même une bonne rigidité et résistance contre tout type de sollicitation mécanique grâce au rebords 3.As we see on the figure 1 , A tube 1 according to the invention has the feature that it is made from a blank made of plastically deformable material, in particular a blank sheet of steel, by stamping or profiling and that the edges 2 facing the tube, which extend substantially longitudinally, therefore at least approximately parallel to a longitudinal axis of the tube, are formed by folding a zone of matter towards the body of the tube, or inwards, as shown by Figures 1 and 2 outward, in accordance with the figure 3 , thus forming flanges 3. Thus, although the tube is open over its entire length, it still has good rigidity and resistance against any type of mechanical stress due to the flanges 3.

La forme des bords avec leurs rebords 3 évolue en fonction de la résistance à atteindre. Les bords peuvent avoir des formes différentes et les rebords 3 ne sont pas forcément plats et collés contre la section principale du tube.The shape of the edges with their edges 3 evolves according to the resistance to be achieved. The edges may have different shapes and the flanges 3 are not necessarily flat and glued against the main section of the tube.

Comme le montre la figure 4 , selon une première variante de réalisation d'un tube selon l'invention, les rebords 3 d'un tube 100 peuvent se prolonger par des excroissances en forme de pattes de fixation 5 et 6, obtenues par repliage vers l'extérieur de la section du tube, au niveau de l'arête extérieure libre 7 d'un rebord 3.As shown in figure 4 according to a first variant embodiment of a tube according to the invention, the flanges 3 of a tube 100 may be extended by protrusions in the form of fastening lugs 5 and 6, obtained by folding the section towards the outside. of the tube, at the free outer edge 7 of a flange 3.

Comme on le voit également clairement sur la figure 4, le rebord du tube 200 peut être en forme d'une bande continue qui s'étend sur toute la longueur ou seulement une partie de celui-ci. Le rebord pourrait aussi être discontinu sur la longueur du tube. Le tube peut encore avoir plusieurs zones frappées, poinçonnées ou découpées à divers endroits. Les deux extrémités du tube peuvent être rectilignes ou avoir des formes différentes.As we also see clearly on the figure 4 , the rim of the tube 200 may be in the form of a continuous strip which extends over the entire length or only a part thereof. The rim could also be discontinuous along the length of the tube. The tube may still have several areas struck, punched or cut in various places. Both ends of the tube may be straight or have different shapes.

Grâce à la possibilité de former sur un tube selon l'invention différentes pattes, le cas échéant avec des vis ou écrous montés sur ces pattes, par exemple la patte 6, les tubes selon l'invention sont particulièrement bien adaptés pour être utilisés dans le domaine de l'automobile et sont utilisables très avantageusement pour la réalisation de traverses de planche de bord, de raidisseurs de porte, d'impacteurs de chocs, d'absorbeurs de choc, de poutres, traverses avant et arrière de parechocs et analogues. Les deux extrémités du tube peuvent être droits, comme représentées dans les dessins, ou avoir une forme évolutive.Thanks to the possibility of forming on a tube according to the invention different legs, if necessary with screws or nuts mounted on these tabs, for example the tab 6, the tubes according to the invention are particularly well suited for use in the domain of the automobile and can be used very advantageously for the production of dashboard crossmembers, door stiffeners, shock impactors, shock absorbers, beams, crossbars front and rear bumpers and the like. Both ends of the tube may be straight, as shown in the drawings, or have an evolutionary shape.

On décrira ci-après, en se référant maintenant aux figures 5 et 6 , les étapes (a) à (f) d'un procédé de fabrication d'un tube selon l'invention, par emboutissage basé sur l'utilisation d'une presse automatique. Ce procédé est seulement donné à titre d'exemple. Les tubes selon l'invention peuvent également être réalisés par profilage basé sur l'utilisation de galets.We will describe below, referring now to figures 5 and 6 the steps (a) to (f) of a method of manufacturing a tube according to the invention, by stamping based on the use of an automatic press. This process is only given as an example. The tubes according to the invention can also be made by profiling based on the use of rollers.

De façon générale, un tube selon l'invention est réalisé par emboutissage à partir d'un flan par exemple d'une tôle d'acier. Dans le cadre du procédé et de la presse selon les figures 5 et 6 , les morceaux ou flans de tôle sont découpés d'une bande d'acier qui est déroulée d'une bobine non représentée et amenés à la presse automatique dont la figure 5 montre schématiquement la structure par une vue de dessus. Cette presse qui porte la référence générale 10 comporte un certain nombre de secteurs de postes de travail dont chacun exécute une fonction spécifique et que chaque flan ou morceau de tôle traverse successivement. Pendant leur passage à travers la presse, les flans découpés d'origine et transformés successivement en un tube notamment cylindrique restent raccrochés les uns aux autres pour pouvoir assurer un transport précisément piloté, pas à pas, d'un secteur d'outil à l'autre et, à l'intérieur de chaque secteur d'un poste de travail à un autre.In general, a tube according to the invention is made by stamping from a blank, for example a steel sheet. As part of the process and the press according to figures 5 and 6 the pieces or blanks of sheet metal are cut from a strip of steel which is unwound from a not shown reel and brought to the automatic press whose figure 5 schematically shows the structure by a view from above. This press which carries the general reference 10 comprises a number of sectors of workstations each of which performs a specific function and each blank or piece of sheet metal passes through successively. During their passage through the press, the blanks cut from the original and successively converted into a tube, in particular a cylindrical tube, hang up to each other in order to be able to ensure a precisely controlled transport, step by step, of a tool sector to the other and within each sector from one workstation to another.

A cette fin, la bande par exemple d'acier notée 12 comporte le long de ses bords longitudinaux des points de pilotage du transport 13 régulièrement répartis, chacun entre deux flans et ensuite de tubes en train d'être formés. On constate que même après la découpe d'un flan, celui-ci reste relié au flan précédent et au flan suivant par un pont de matière 14 au niveau d'un point de pilotage 13.For this purpose, the strip of steel, for example 12 noted comprises along its longitudinal edges transport control points 13 regularly distributed, each between two blanks and then tubes being formed. It can be seen that even after cutting a blank, it remains connected to the previous blank and the next blank by a material bridge 14 at a control point 13.

Comme on le voit sur la figure 5 , la presse 10 comporte, dans le sens de défilement de la bande 12 indiquée par une flèche F, tout d'abord un secteur de découpe 15 des flans dans la bande, qui, dans l'exemple représenté, comporte deux postes de découpe. Dans le premier poste de découpe 16, la presse effectue deux découpes rectilignes perpendiculaires à l'axe X de la bande, chacune à partir de l'endroit qui constituera ultérieurement une extrémité frontale du tube, d'une longueur prédéterminée en direction de l'axe, la partie entre ces deux découpes restant intacte. Le poste de découpe suivant 18 accomplit la découpe des parties restantes du contour du flan, à l'exception des ponts 14, comme cela est indiqué par les lignes de découpe des extrémités frontales 19 parallèles à la direction d'avancement de la bande et la ligne de découpe 20 de la zone entre les deux découpes 17 effectuées au premier poste. Au secteur de découpe 15 succède un poste à vide 22 dans lequel le flan noté maintenant 23, se présente entièrement découpé, bien entendu à l'exception des ponts 14 de rattachement.As we see on the figure 5 , the press 10 comprises, in the direction of travel of the band 12 indicated by an arrow F, first of all a cutting sector 15 blanks in the band, which, in the example shown, comprises two cutting stations. In the first cutting station 16, the press makes two rectilinear cuts perpendicular to the X axis of the strip, each starting from the place which will subsequently constitute a front end of the tube, of a predetermined length in the direction of the axis, the part between these two cuts remaining intact. The next cutting station 18 cuts the remaining portions of the blank contour, except for the bridges 14, as indicated by the cutting lines of the front ends 19 parallel to the direction of travel of the web and the cutting line 20 of the area between the two cuts 17 made at the first station. The cutting sector 15 succeeds a vacuum station 22 in which the blank noted now 23, is completely cut, of course with the exception of the bridges 14 of attachment.

La presse comporte ensuite, dans l'exemple représenté, un secteur de poste de cambrage 26, qui comporte deux postes de cambrage 27, 28 et un poste de cambrage écrasage 29.The press then comprises, in the example shown, a bending post sector 26, which comprises two bending stations 27, 28 and a crushing bending station 29.

Au premier poste de cambrage est accomplie la première phase de la réalisation des rebords 3 devant être repliés le long des extrémités avant 24 et arrière 25 d'un flan 23, c'est-à-dire perpendiculairement à la direction d'avancement de la bande 12. Les rebords 3 sont repliés dans ce poste selon un angle un peu supérieur à 90°. Au deuxième poste de cambrage on replie les rebords jusqu'à un angle d'environ 145° et au troisième poste de cambrage écrasage 29, les rebords 3 sont entièrement repliés et plaqués contre la surface supérieure du flan 23. Au secteur de cambrage 25 suit le secteur de roulage 32. Dans ce secteur, qui comporte trois postes de roulage 33, 34, 35 le flan 23 avec les rebords 3 repliés est transformé en un tube cylindrique tel que représenté à la figure 1 .At the first bending station is completed the first phase of the production of the flanges 3 to be folded along the front and rear ends 24 of a blank 23, that is to say perpendicular to the direction of advancement of the 12. The edges 3 are folded in this position at an angle slightly greater than 90 °. At the second bending station the flanges are bent to an angle of about 145 ° and at the third bending crimping station 29, the flanges 3 are entirely folded and pressed against the upper surface of the blank 23. The bending sector 25 follows the driving sector 32. In this sector, which comprises three rolling stations 33, 34, 35 the blank 23 with the folded edges 3 is transformed into a cylindrical tube as shown in the figure 1 .

Etant donné que l'axe de roulage s'étend perpendiculairement à l'axe de la bande d'acier et que la ligne de découpe pour former les bords longitudinaux du tube est également perpendiculaire à l'axe de la bande, d'une part, et que l'opération de roulage se fait après l'opération de découpe du flan à partir duquel le tube est réalisé, l'invention permet de donner aux bords en regard du tube toute forme souhaitée. Ainsi l'invention permet de prévoir sur le tube des pattes de fixation d'autres organes, telles que des pattes 5 et 6, qui sont réalisés dans la presse d'emboutissage. Ainsi, des pattes de fixation n'ont pas besoin d'être rapportées sur le tube, après sa fabrication, lors d'une opération supplémentaire, par exemple par soudage.Since the rolling axis extends perpendicular to the axis of the steel strip and the cutting line to form the longitudinal edges of the tube is also perpendicular to the axis of the strip, on the one hand , and that the rolling operation is done after the cutting operation of the blank from which the tube is made, the invention makes it possible to give the edges facing the tube any desired shape. Thus, the invention makes it possible to provide on the tube fastening lugs of other members, such as lugs 5 and 6, which are made in the stamping press. Thus, fastening lugs do not need to be attached to the tube, after its manufacture, during an additional operation, for example by welding.

La figure 7 représente un tube 200 selon une seconde variation de réalisation de l'invention. Le tube 200 est réalisé, comme le tube 100, à partir d'un flan en un matériau plastiquement déformable, notamment un flan de tôle d'acier, par emboutissage ou par profilage et avec des pattes de fixation 5, 6. Le tube 200 diffère du tube 100 par le fait qu'il comporte un rebord 3A à partir duquel sont formées des pattes de fixation 5, 6 et un rebord 3B avec des encoches ou découpes correspondant à la matière nécessaire pour former les pattes de fixation 5, 6. La figure 8 représente schématiquement comment cette variante de réalisation se répercute sur la découpe des flans dans une bande d'acier. Deux flans successifs 201, 202 sont découpés avec un bord 2A comportant des excroissances donnant les pattes de fixation 5, 6 et avec un bord 2B comportant des découpes 51, 61 correspondant à la matière des pattes 5, 6. Il est donc clairement visible que la seconde variante de réalisation permet de découper, à dimensions du tube et des pattes égales, à partir d'un rouleau d'acier donné, beaucoup plus de tubes 200 que de tubes 100.The figure 7 represents a tube 200 according to a second variation of embodiment of the invention. The tube 200 is made, like the tube 100, from a blank made of a plastically deformable material, especially a sheet steel blank, by stamping or profiling and with fixing lugs 5, 6. The tube 200 differs from the tube 100 in that it comprises a flange 3A from which are formed fastening lugs 5, 6 and a flange 3B with notches or cuts corresponding to the material necessary to form the fastening lugs 5, 6. The figure 8 schematically represents how this variant embodiment affects the cutting blanks in a steel strip. Two successive blanks 201, 202 are cut with an edge 2A having protrusions giving the fixing lugs 5, 6 and with an edge 2B having cutouts 51, 61 corresponding to the material of the legs 5, 6. It is therefore clearly visible that the second embodiment allows to cut, to dimensions of the tube and legs equal, from a given steel roll, many more tubes 200 than 100 tubes.

La figure 9 représente les étapes (a) à (g) de la réalisation d'un tube 100 ou 200 selon l'invention. Comme le montre schématiquement la figure 9 , il suffit de configurer les pattes de fixation 5, 6 de façon appropriée par rapport au repli 3, avant l'opération de cambrage pour avoir la forme des pattes de fixation 5 ou 6 selon la figure 4 ou la figure 7.The figure 9 represents steps (a) to (g) of the production of a tube 100 or 200 according to the invention. As schematically shows figure 9 it is sufficient to configure the fastening lugs 5, 6 appropriately with respect to the fold 3, before the bending operation to have the shape of the fastening lugs 5 or 6 according to the figure 4 or the figure 7 .

L'invention permet également de prévoir sur le tube, une pièce, des pattes aux extrémités frontales par une découpe appropriée du flan et la mise en forme de ces pattes avant l'opération de roulage du flan pour obtenir le tube ouvert selon l'invention.The invention also makes it possible to provide on the tube, a piece, tabs at the front ends by a suitable cut of the blank and the shaping of these tabs before the rolling operation of the blank to obtain the open tube according to the invention .

La figure 10 illustre, à titre d'exemple, l'application de l'invention pour la réalisation d'une traverse de planche de bord d'un véhicule. Sur cette figure, on constate que la traverse comporte deux tubes selon l'invention, à savoir un tube 1 sans pattes de fixation et un tube 200 avec des pattes de fixation son montage dans l'environnement du véhicule.The figure 10 illustrates, by way of example, the application of the invention for producing a dashboard cross member of a vehicle. In this figure, it is found that the crossbar comprises two tubes according to the invention, namely a tube 1 without mounting tabs and a tube 200 with mounting tabs mounting in the vehicle environment.

La figure 11 montre pour différentes configurations de tube, la relation entre la rigidité du tube sous l'effet de force de contact, en fonction du temps. Sur l'ordonnée de cette figure est rapportée l'énergie de contact EC tandis que l'axe 6 est l'axe de l'écoulement du temps t. Les calculs de rigidité qui ont permis la réalisation des tubes ont été faits avec un logiciel de dénomination RADIOSS. La figure 11 montre quatre courbes : en A la courbe d'un tube selon l'invention dont le rebord est replié sur l'extérieur du tube, en B la courbe d'un tube selon l'invention avec le repli vers l'intérieur, en C la courbe d'un tube obtenu à partir d'un flan mais fermé par un cordon de soudure et en D la courbe d'un tube ouvert sans rebord.The figure 11 shows for different tube configurations, the relationship between the stiffness of the tube under the effect of contact force, as a function of time. On the ordinate of this figure is reported the contact energy EC while the axis 6 is the axis of the flow of time t. The rigidity calculations that allowed the tubes to be made were made using RADIOSS naming software. The figure 11 shows four curves: in A the curve of a tube according to the invention whose rim is folded on the outside of the tube, in B the curve of a tube according to the invention with the fold inwards, in C the curve of a tube obtained from a blank but closed by a weld bead and at D the curve of an open tube without a flange.

Il ressort des courbes de la figure 11 que les tubes selon l'invention, à savoir les courbes A et B ont une meilleure rigidité que les tubes selon l'état de la technique représentée par les courbes C et D.It follows from the curves of the figure 11 that the tubes according to the invention, namely the curves A and B have a better rigidity than the tubes according to the state of the art represented by the curves C and D.

Bien entendu pour l'étude comparative ayant abouti à la figure 11 , les épaisseurs, matière et diamètre de section des tubes ont été identiques et un même effort est appliqué au centre du tube via un impacteur avec une même vitesse. Les encastrements des extrémités lors de l'application sont également identiques.Of course, for the comparative study that resulted in figure 11 , Thickness, material and tube section diameter were identical and the same force is applied to the center of the tube via an impactor with a same speed. The embedding of the ends during the application are also identical.

Claims (11)

  1. Tube produced starting from a plastically deformable material, such as metal, taking the form of a blank or a strip, the tube (1) being open over its entire length and at least one of the two edges (2) facing one another having at least one zone (3) which is folded back towards the wall of the tube, characterised in that the tube (1) has at least one fixing lug (5, 6) or other element produced in the form of a projection of the folded-back zone (3) of a tube edge.
  2. Tube according to claim 1, characterised in that the edge (2) facing the edge (2) provided with the fixing lug (5, 6) has a recess of complementary shape, the fixing lug being formed as a result of cutting out the recess.
  3. Tube according to claim 1 or 3, characterised in that both edges (2) are folded back.
  4. Tube according to any one of claims 1 to 3, characterised in that the fold-back (3) is made either towards the interior or towards the exterior of the cross-section of the tube.
  5. Tube according to any one of claims 1 to 4, characterised in that the cross-section of the tube is uniform throughout its length.
  6. Tube according to one of claims 1 to 5, characterised in that it has fixing lugs at at least one end-face extremity.
  7. Method of manufacturing a tube according to one of claims 1 to 6, characterised in that it is obtained starting from a blank having at least two edges which are parallel, by operations firstly of cutting out a blank and bending (at 26) for producing fold-backs (3), and then by rolling (at 32) to give the tube its cylindrical shape, the fixing lug or lugs being produced in the course of cutting out the blank, production of the fold-backs (3) including, at the edge being produced having one or more fixing lugs, a folding-back of the edge whilst maintaining the fixing-lug-forming projection or projections at least approximately perpendicular to the blank and also folding for forming the shape of the fixing lug or lugs after rolling of the blank.
  8. Method according to claim 7, the fixing lug or lugs (5, 6) on one edge (2) of the tube being obtained by cutting out from the other edge (2) of the tube.
  9. Method according to claim 8, characterised in that the blank is obtained by cutting out from a strip of material whilst keeping it joined to the strip by zones in the form of bridges (14), the method comprising operations of cutting out the blank, with the exception of the bridges, along cutting lines perpendicular to the axis of the strip, the connection points (14) being located at the longitudinal edges of the strip.
  10. Method according to claim 9, characterised in that the strip includes, along its longitudinal edges, indexing points (13) for the movement of advancing the strip from one work station to another.
  11. Method according to one of claims 7 to 10, characterised in that it includes, following the mentioned cutting-out operation, an operation of bending (at 26) of the cut-out edges of the blank for producing the fold-backs (3) followed by an operation of rolling (at 32) for producing the cylindrical shape of the tube.
EP09163818A 2008-06-27 2009-06-25 Tube manufactured from a planar blank and method of manufacturing such a tube Active EP2138246B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL09163818T PL2138246T3 (en) 2008-06-27 2009-06-25 Tube manufactured from a planar blank and method of manufacturing such a tube
SI200930028T SI2138246T1 (en) 2008-06-27 2009-06-25 Tube manufactured from a planar blank and method of manufacturing such a tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0854345A FR2933014B1 (en) 2008-06-27 2008-06-27 TUBE REALIZED FROM A FLAN

Publications (2)

Publication Number Publication Date
EP2138246A1 EP2138246A1 (en) 2009-12-30
EP2138246B1 true EP2138246B1 (en) 2011-04-27

Family

ID=40292465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09163818A Active EP2138246B1 (en) 2008-06-27 2009-06-25 Tube manufactured from a planar blank and method of manufacturing such a tube

Country Status (8)

Country Link
EP (1) EP2138246B1 (en)
AT (1) ATE507016T1 (en)
DE (1) DE602009001142D1 (en)
ES (1) ES2363801T3 (en)
FR (1) FR2933014B1 (en)
PL (1) PL2138246T3 (en)
PT (1) PT2138246E (en)
SI (1) SI2138246T1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE525415A (en) *
CH341520A (en) * 1955-01-21 1959-10-15 Morris Motors Ltd Process for the production of flat tubes made of aluminum or a light metal alloy for tube heat exchangers
NL6402439A (en) * 1964-03-10 1965-09-13
FR2673589B1 (en) * 1991-03-04 1993-07-09 Nacan STEERING COLUMN TUBE FOR MOTOR VEHICLE.
JP2003190282A (en) * 2001-12-27 2003-07-08 Terumo Corp Metal tubular body and its manufacturing method

Also Published As

Publication number Publication date
PL2138246T3 (en) 2011-09-30
ES2363801T3 (en) 2011-08-17
SI2138246T1 (en) 2011-09-30
DE602009001142D1 (en) 2011-06-09
ATE507016T1 (en) 2011-05-15
PT2138246E (en) 2011-07-28
FR2933014A1 (en) 2010-01-01
EP2138246A1 (en) 2009-12-30
FR2933014B1 (en) 2011-04-22

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