EP0826440A1 - Apparatus for forming metal sections - Google Patents

Apparatus for forming metal sections Download PDF

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Publication number
EP0826440A1
EP0826440A1 EP97401964A EP97401964A EP0826440A1 EP 0826440 A1 EP0826440 A1 EP 0826440A1 EP 97401964 A EP97401964 A EP 97401964A EP 97401964 A EP97401964 A EP 97401964A EP 0826440 A1 EP0826440 A1 EP 0826440A1
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EP
European Patent Office
Prior art keywords
profile
filling
bending
former
jaws
Prior art date
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Granted
Application number
EP97401964A
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German (de)
French (fr)
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EP0826440B1 (en
Inventor
Jean-Paul Huet
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ACB
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GEC Alsthom ACB
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Publication of EP0826440A1 publication Critical patent/EP0826440A1/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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—Mould construction
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/08—Bending tubes using mandrels or the like in press brakes or between rams and anvils or abutments; Pliers with forming dies

Definitions

  • the present invention relates to equipment for forming of metal profiles.
  • the object of the present invention is to provide a equipment that performs on a forming machine by stretching, not only the bending operation of the streamlined but also a hydroforming operation and this successively or simultaneously and without requiring subsequent cleaning of the profile.
  • the invention therefore relates to equipment for forming metal profiles on a bending machine by stretching on which a profile to be formed is taken at its ends by jaws linked to drawing cylinders and to bending means against a convex shape fixed on a machine tool table, characterized in that it includes a counterform and means for applying it against said shape once the profile is bent against form, a filling piece of elastic material being intended to be placed inside said profile and means being provided for subjecting said piece of filling at a pressure-expansion so that it strongly applies the profile against internal surfaces of closed form and counter-form one against the other.
  • said part filling in elastic material is in two parts distinct, touching end to end once introduced in the profile, each part of said piece of filling with a channel opening to a single end and being blind at the opposite end, the end where the channel opens out being linked to a metal insert of jaw tightening and hydraulic pressure supply and equipped with a means of connection to means hydraulic pressurizing, said metal insert penetrating into the corresponding end of the profile.
  • said means to subject the filling part to pressure-expansion includes a compression piston machined to the profile inside of the profile and subjected to a thrust F by a means any.
  • Figure 1 is a schematic front view showing a stretch bending machine with the equipment according to the invention.
  • Figure 2 is a top view of Figure 1.
  • Figure 3 is a top view of Figure 1 but in the position where, unlike Figure 2, the bending is carried out and the counter-form being applied against form.
  • Figure 4 is an enlarged partial view showing the profile bent against the form with the counter-form in closed position against form.
  • Figure 5 is the same as Figure 3 but with the filling part in its compressed-expanded state by the using hydraulic fluid.
  • Figure 6 shows an enlarged partial view, in cutting, one end of the equipment, in the case of forming of a closed section profile.
  • Figure 7 is a section along VII-VII of the figure 6.
  • Figure 8 is similar to Figure 6 but in the case of forming an open section profile.
  • Figure 9 is a section along XI-XI of Figure 8.
  • Figure 10 is similar to Figure 6 but in the case where the compression-expansion means of the part filling is carried out by a piston.
  • the machine has conventionally a frame 1 comprising a tool table 1 on which we just fix a shape 3 of convex profile corresponding to the bending to be obtained, two clamping jaws 4, 5 of the profile 6 to be bent, linked to stretching cylinders 7, 8 allowing to exert a traction force on the profile 6 during its winding around the form 3, the jacks 7, 8 being themselves linked to two arms 9, 10 pivoting around axes 11, 12 connected to jacks 13, 14 and ensuring winding the profile 6 against the convex shape 3.
  • the machine comprises a equipment for performing an operation hydroforming on the same machine and this simultaneously or not with a drawing operation by the drawing jacks 7, 8, so as to combine the expansion constraints and of elongation in the material of the profile to be formed.
  • This equipment first includes a counter-form 15 with jacks 16, 17 to apply this counterform 15 against form 3 when the profile is bent against shape, as shown in FIG. 3.
  • Keys 18, 19 (FIGS. 6 and 7) make it possible to lock the counterform 15 on form 3 as shown in FIG. 7, the form and the counterform are machined to the profile of the profile 6.
  • form and counter-form to constitute, when are in the closed position (figure 3, 4, 5, 7) a channel following the external contours of the final piece to obtain, increased, lengthwise, minimum length required for cutting and the tightness of the ends, and corrected to take account different elastic returns of the material of which the profile to be formed when it returns from its shape under constraints to the desired final shape without constraints external.
  • the form and the counter-form can each be do it in one or more parts.
  • Form 3 bending can in particular have a contour not only convex but have one or more inflection points.
  • the equipment also includes a filling part 20 of elastic material, visible in FIGS. 4, 5, 6, 7 and made up of two parts 20 A, 20 B in this form of realization corresponding to these figures.
  • This filling part 20, in two parts 20 A and 20 B, is introduced into the profile before bending and provides, during bending, support for the parts of the profile not in contact with the shape 3.
  • the equipment includes means for compressing and expanding the workpiece filling 20.
  • each part 20 A (20 B) of the filling part 20 is hollowed out with a blind channel 21 at one end and opening at the other.
  • it is equipped with means 23 for connection to a circuit hydraulics including 24 regulation and a pump hydraulic 25 ( Figures 2 and 3).
  • a counterform 15 with a recess 26 we have shown a counterform 15 with a recess 26.
  • hydraulic pressure P is sent, ensuring expansion of the filling part 20 and the plating of the profile 6 against the surfaces of the channel formed by form 3 and the platform 15 closed against each other.
  • This recess 26 making it possible to carry out in the profile 6 local deformation by pressure-expansion of the filling part 20 made of material elastic can also be performed in form 3.
  • the recess may be such that said pressure-expansion causes shearing of holes or of the entire circumference of the profile, for example for detach the ends held by the jaws, from the part central component of the finished part.
  • Figure 7 is a section along VII-VII of the figure 6 but before the pressurization of the part 20 by the channel 21 while in FIG. 6 the filling part 20 is shown in expanded condition and the profile 6 plated against the walls of the canal.
  • the profile 6 to be bent and form is of closed section as can be seen in Figure 7.
  • An advantage of using the coin filling 20 for securing the profile 6 against the walls of its channel-shaped housing consists of that the profile does not need to be cleaned after its installation in shape since it is not in contact with the hydroforming liquid, the two parts 20 A and 20 B of the piece of filling being waterproof.
  • Figure 6 shows that one can perform in the profile 6 of concave deformations by means of punches such as 27, the elastic filling piece 20 playing then the role of stamping cushion.
  • the pressurization of channel 21 can be carried out at will before, simultaneously or successively with a drawing operation by the jaws 4.5 by means of the jacks 6.7.
  • Figures 8 and 9, respectively equivalent to Figures 6 and 7 show the case of bending and forming of a section 6 with open section.
  • Figure 10 shows a variant in which the pressure-expansion of the filling part 20 is performed, not by hydraulic pressure, but by the by means of a compression piston 28 machined to the profile inside of the profile.
  • This piston rests directly against the elastic filling part 20 and it has a tail 29 passing through a metal insert 30 used for clamping of the jaws 5.
  • the compression-expansion is ensured by the means of a thrust force F exerted on the piston 28 by any known means.
  • This variant can in particular be used when the profile 1 to be formed is short in length.
  • the elastic filling part 20 is in one only part.
  • the effort F can be carried out only by a single end, in which case the other end is closed by a metal insert for clamping the jaws 4, solid, without piston tail hole, filler piece leaning directly against this insert.
  • the elastic filling part 20 is for example an elastomer such as polyurethane.
  • the hydraulic pressure sent can be understood between a few dozen bars and a few thousand bars.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

Equipment is claimed for the forming of metal sections (6) on a bending machine by drawing on which a section to be formed is placed with its ends through some jaws (4, 5) connected to some drawing jacks (7, 8) and to some means of bending (9, 10, 13, 14) against a convex former (3) fixed on a tool carrying table (2) of the machine. It incorporates a counter former (15) and some means (16, 17) for applying against the convex former (3) at once the section (6) bent against the former (3), a filling component (20) of an elastic material being provided to be placed inside the section (6) and some means being provided in order to submit the filling component (20) to an expansion pressure such that it applies itself strongly against the internal surfaces of the former (3) and the counter former (15) which are closed with respect to each other.

Description

La présente invention concerne un équipement pour le formage de profilés métalliques.The present invention relates to equipment for forming of metal profiles.

Pour la mise en forme de profilés métalliques, on connait le formage par étirage qui permet d'obtenir une meilleure précision que le simple cintrage conventionnel. On peut par exemple obtenir une précision de plus ou moins 1 mm par le formage par étirage contre plus ou moins 5 mm pour le cintrage conventionnel.For the shaping of metal profiles, we knows the stretch forming which allows to obtain a better precision than simple conventional bending. We can for example obtain an accuracy of plus or minus 1 mm by stretching against plus or minus 5 mm for the conventional bending.

Pour l'obtention de déformations locales d'un profilé on connaít également le procédé d'hydroformage qui permet d'obtenir une très bonne précision de plus ou moins 0,2 mm et consistant à enfermer le profilé dans une coquille présentant des cavités adéquates et à envoyer dans le profilé un liquide sous forte pression de façon à faire épouser au profilé les formes internes de la coquille. Si le profilé doit en outre être cintré, il est nécessaire, préalablement, d'effectuer cette opération de cintrage, par cintrage conventionnel ou par formage par étirage. L'hydroformage qui utilise un fluide hydraulique généralement huileux nécessite un nettoyage ultérieur du profilé.For obtaining local deformations of a profile we also know the hydroforming process which allows obtain very good accuracy of plus or minus 0.2 mm and consisting in enclosing the profile in a shell with adequate cavities and to send in the profiled a liquid under high pressure so as to make conform to the profile of the internal shapes of the shell. If the profile must also be bent, it is necessary, beforehand, to carry out this bending operation, by conventional bending or by stretch forming. Hydroforming using hydraulic fluid generally oily requires subsequent cleaning of the streamlined.

La présente invention a pour but de proposer un équipement qui permet d'effectuer sur une machine de formage par étirage, non seulement l'opération de cintrage du profilé mais également une opération d'hydroformage et ceci successivement ou simultanément et sans nécessiter de nettoyage ultérieur du profilé.The object of the present invention is to provide a equipment that performs on a forming machine by stretching, not only the bending operation of the streamlined but also a hydroforming operation and this successively or simultaneously and without requiring subsequent cleaning of the profile.

L'invention a ainsi pour objet un équipement pour le formage de profilés métalliques sur une machine à cintrer par étirage sur laquelle un profilé à former est pris à ses extrémités par des mors liés à des vérins d'étirage et à des moyens de cintrage contre une forme convexe fixée sur une table porte-outils de la machine, caractérisé en ce qu'il comprend une contre-forme et des moyens pour l'appliquer contre ladite forme une fois le profilé cintré contre la forme, une pièce de remplissage en matériau élastique étant prévue pour être placée à l'intérieur dudit profilé et des moyens étant prévus pour soumettre ladite pièce de remplissage à une pression-expansion de manière à ce qu'elle applique fortement le profilé contre les surfaces internes de la forme et de la contre-forme fermées l'une contre l'autre.The invention therefore relates to equipment for forming metal profiles on a bending machine by stretching on which a profile to be formed is taken at its ends by jaws linked to drawing cylinders and to bending means against a convex shape fixed on a machine tool table, characterized in that it includes a counterform and means for applying it against said shape once the profile is bent against form, a filling piece of elastic material being intended to be placed inside said profile and means being provided for subjecting said piece of filling at a pressure-expansion so that it strongly applies the profile against internal surfaces of closed form and counter-form one against the other.

Selon une première forme de réalisation, ladite pièce de remplissage en matériau élastique est en deux parties distinctes, se touchant bout à bout une fois introduites dans le profilé, chaque partie de ladite pièce de remplissage comportant un canal débouchant à une seule extrémité et étant borgne à l'extrémité opposée, l'extrémité où le canal débouche étant lié à un insert métallique de serrage des mors et d'alimentation en pression hydraulique et équipé d'un moyen de raccordement à des moyens hydrauliques de mise en pression, ledit insert métallique pénétrant dans l'extrémité correspondante du profilé.According to a first embodiment, said part filling in elastic material is in two parts distinct, touching end to end once introduced in the profile, each part of said piece of filling with a channel opening to a single end and being blind at the opposite end, the end where the channel opens out being linked to a metal insert of jaw tightening and hydraulic pressure supply and equipped with a means of connection to means hydraulic pressurizing, said metal insert penetrating into the corresponding end of the profile.

Selon une seconde forme de réalisation, lesdits moyens pour soumettre la pièce de remplissage à une pression-expansion comprend un piston de compression usiné au profil intérieure du profilé et soumis à une poussée F par un moyen quelconque.According to a second embodiment, said means to subject the filling part to pressure-expansion includes a compression piston machined to the profile inside of the profile and subjected to a thrust F by a means any.

On va maintenant donner la description d'un exemple de mise en oeuvre de l'invention en se reportant au dessin annexé dans lequel :We will now give the description of an example of implementation of the invention with reference to the drawing annexed in which:

La figure 1 est une vue schématique de face montrant une machine à cintrer par étirage comportant l'équipement selon l'invention.Figure 1 is a schematic front view showing a stretch bending machine with the equipment according to the invention.

La figure 2 est une vue de dessus de la figure 1.Figure 2 is a top view of Figure 1.

La figure 3 est une vue de dessus de la figure 1 mais dans la position où, contrairement à la figure 2, le cintrage est effectué et la contre-forme étant appliquée contre la forme. Figure 3 is a top view of Figure 1 but in the position where, unlike Figure 2, the bending is carried out and the counter-form being applied against form.

La figure 4 est une vue partielle agrandie montrant le profilé cintré contre la forme avec la contre-forme en position fermée contre la forme.Figure 4 is an enlarged partial view showing the profile bent against the form with the counter-form in closed position against form.

La figure 5 est la même que la figure 3 mais avec la pièce de remplissage dans son état compressé-expansé par le moyen d'un fluide hydraulique.Figure 5 is the same as Figure 3 but with the filling part in its compressed-expanded state by the using hydraulic fluid.

La figure 6 montre en vue partielle agrandie, en coupe, une extrémité de l'équipement, dans le cas du formage d'un profilé à section fermée.Figure 6 shows an enlarged partial view, in cutting, one end of the equipment, in the case of forming of a closed section profile.

La figure 7 est une coupe selon VII-VII de la figure 6.Figure 7 is a section along VII-VII of the figure 6.

La figure 8 est similaire à la figure 6 mais dans le cas du formage d'un profilé à section ouverte.Figure 8 is similar to Figure 6 but in the case of forming an open section profile.

La figure 9 est une coupe selon XI-XI de la figure 8.Figure 9 is a section along XI-XI of Figure 8.

La figure 10 est similaire à la figure 6 mais dans le cas où le moyen de mise en compression-expansion de la pièce de remplissage est effectué par un piston.Figure 10 is similar to Figure 6 but in the case where the compression-expansion means of the part filling is carried out by a piston.

En se reportant aux figures 1 et 2, on voit une machine à cintrer des profilés. Cette machine comporte classiquement un bâti 1 comprenant une table porte-outils 1 sur laquelle on vient fixer une forme 3 de profil convexe correspondant au cintrage à obtenir, deux mors de serrage 4, 5 du profilé 6 à cintrer, liés à des vérins d'étirage 7, 8 permettant d'exercer un effort de traction sur le profilé 6 pendant son enroulement autour de la forme 3, les vérins 7, 8 étant eux-mêmes liés à deux bras 9, 10 pivotant autour d'axes 11, 12 reliés à des vérins 13, 14 et assurant l'enroulement du profilé 6 contre la forme convexe 3. Conformément à l'invention, la machine comporte un équipement permettant d'effectuer une opération d'hydroformage sur la même machine et ceci simultanément ou non avec une opération d'étirage par les vérins d'étirage 7, 8, de façon à combiner les contraintes d'expansion et d'allongement dans le matériau du profilé à former.Referring to Figures 1 and 2, we see a profile bending machine. This machine has conventionally a frame 1 comprising a tool table 1 on which we just fix a shape 3 of convex profile corresponding to the bending to be obtained, two clamping jaws 4, 5 of the profile 6 to be bent, linked to stretching cylinders 7, 8 allowing to exert a traction force on the profile 6 during its winding around the form 3, the jacks 7, 8 being themselves linked to two arms 9, 10 pivoting around axes 11, 12 connected to jacks 13, 14 and ensuring winding the profile 6 against the convex shape 3. According to the invention, the machine comprises a equipment for performing an operation hydroforming on the same machine and this simultaneously or not with a drawing operation by the drawing jacks 7, 8, so as to combine the expansion constraints and of elongation in the material of the profile to be formed.

Cet équipement comprend d'abord une contre-forme 15 avec des vérins 16, 17 pour appliquer cette contre-forme 15 contre la forme 3 lorsque le profilé est cintré contre la forme, comme le montre la figure 3. Des clavettes 18, 19 (figure 6 et 7) permettent de verrouiller la contre-forme 15 sur la forme 3 comme le montre la figure 7, la forme et la contre-forme sont usinés au profil du profilé 6. Ces deux outils : forme et contre-forme devant constituer, lorsqu'ils sont en position fermée (figure 3, 4, 5, 7) un canal épousant les contours extérieurs de la pièce finale à obtenir, augmentée, dans le sens de sa longueur, des surlongueurs minimales nécessaires à la coupe et à l'étanchéité des extrémités, et corrigés pour tenir compte des différents retours élastiques du matériau constitutif du profilé à former lorsqu'il revient de sa forme sous contraintes à la forme finale souhaitée sans contraintes externes.This equipment first includes a counter-form 15 with jacks 16, 17 to apply this counterform 15 against form 3 when the profile is bent against shape, as shown in FIG. 3. Keys 18, 19 (FIGS. 6 and 7) make it possible to lock the counterform 15 on form 3 as shown in FIG. 7, the form and the counterform are machined to the profile of the profile 6. These two tools: form and counter-form to constitute, when are in the closed position (figure 3, 4, 5, 7) a channel following the external contours of the final piece to obtain, increased, lengthwise, minimum length required for cutting and the tightness of the ends, and corrected to take account different elastic returns of the material of which the profile to be formed when it returns from its shape under constraints to the desired final shape without constraints external.

La forme et la contre-forme peuvent chacune être faites en une ou plusieurs parties. La forme 3 de cintrage peut notamment avoir un contour non uniquement convexe mais avoir un ou plusieurs point d'inflexion. Dans ce cas, bien entendu, on utilise la contre-forme 15 pour faire épouser au profilé 6 la courbure de la forme dans ses parties concaves.The form and the counter-form can each be do it in one or more parts. Form 3 bending can in particular have a contour not only convex but have one or more inflection points. In this case, well of course, we use the counterform 15 to marry profile 6 the curvature of the form in its concave parts.

L'équipement comprend encore une pièce de remplissage 20 en matériau élastique, visible sur les figures 4, 5, 6, 7 et constituée en deux parties 20 A, 20 B dans cette forme de réalisation correspondant à ces figures.The equipment also includes a filling part 20 of elastic material, visible in FIGS. 4, 5, 6, 7 and made up of two parts 20 A, 20 B in this form of realization corresponding to these figures.

Cette pièce de remplissage 20, en deux parties 20 A et 20 B, est introduite dans le profilé dès avant le cintrage et assure, lors du cintrage, un support pour les parties externes du profilé non au contact de la forme 3.This filling part 20, in two parts 20 A and 20 B, is introduced into the profile before bending and provides, during bending, support for the parts of the profile not in contact with the shape 3.

Par ailleurs, de façon à faire épouser par le profilé 6, les contours internes de la forme et de la contre-forme fermées et verrouillées l'une contre l'autre, l'équipement comprend des moyens pour comprimer-expanser la pièce de remplissage 20.In addition, so as to make marry by the profile 6, the internal contours of the form and the counter-form closed and locked against each other, the equipment includes means for compressing and expanding the workpiece filling 20.

Dans la réalisation correspondant aux figures 4 à 7 et aussi aux figures 8 et 9, on utilise une pression hydraulique. Pour cela, chaque partie 20 A (20 B) de la pièce de remplissage 20 est creusée d'un canal 21 borgne à une extrémité et débouchant à l'autre. L'extrémité où le canal débouche est liée à un insert métallique 22 qui pénètre dans l'extrémité correspondante du profilé et permet le serrage des mors 4, 5 et assure l'alimentation hydraulique. A cet effet, comme on le voit figure 6, il est équipé d'un moyen 23 de raccordement à un circuit hydraulique comprenant une régulation 24 et une pompe hydraulique 25 (figure 2 et 3). Sur la figure 4, on a montré une contre-forme 15 avec un évidement 26. Sur la figure 5, une pression hydraulique P est envoyée, assurant l'expansion de la pièce de remplissage 20 et le placage du profilé 6 contre les surfaces du canal formé par la forme 3 et la contre-forme 15 fermées l'une contre l'autre.In the embodiment corresponding to FIGS. 4 to 7 and also in figures 8 and 9, a pressure is used hydraulic. For this, each part 20 A (20 B) of the filling part 20 is hollowed out with a blind channel 21 at one end and opening at the other. The end where the outlet channel is linked to a metal insert 22 which penetrates into the corresponding end of the profile and allows clamping jaws 4, 5 and ensuring the supply hydraulic. For this purpose, as seen in Figure 6, it is equipped with means 23 for connection to a circuit hydraulics including 24 regulation and a pump hydraulic 25 (Figures 2 and 3). In Figure 4, we have shown a counterform 15 with a recess 26. In FIG. 5, hydraulic pressure P is sent, ensuring expansion of the filling part 20 and the plating of the profile 6 against the surfaces of the channel formed by form 3 and the platform 15 closed against each other.

Cet évidement 26 permettant d'effectuer dans le profilé 6 une déformation locale par la mise en pression-expansion de la pièce de remplissage 20 en matériau élastique peut également être effectué dans la forme 3. En outre, l'évidement peut être tel que ladite pression-expansion provoque le découpage par cisaillement de trous ou de toute la circonférence du profilé, par exemple pour détacher les extrémités tenues par les mors, de la partie centrale constituant la pièce finie.This recess 26 making it possible to carry out in the profile 6 local deformation by pressure-expansion of the filling part 20 made of material elastic can also be performed in form 3. In further, the recess may be such that said pressure-expansion causes shearing of holes or of the entire circumference of the profile, for example for detach the ends held by the jaws, from the part central component of the finished part.

La figure 7 est une section selon VII-VII de la figure 6 mais avant la mise sous pression de la pièce 20 par le canal 21 alors que sur la figure 6 la pièce de remplissage 20 est représentée en état expansé et le profilé 6 plaqué contre les parois du canal.Figure 7 is a section along VII-VII of the figure 6 but before the pressurization of the part 20 by the channel 21 while in FIG. 6 the filling part 20 is shown in expanded condition and the profile 6 plated against the walls of the canal.

Dans ces figures 4 à 7, le profilé 6 à cintrer et former est de section fermée comme on le voit bien figure 7.In these figures 4 to 7, the profile 6 to be bent and form is of closed section as can be seen in Figure 7.

Un avantage de l'utilisation de la pièce de remplissage 20 pour assurer le placage du profilé 6 contre les parois de son logement en forme de canal, consiste en ce que le profilé n'a pas besoin d'être nettoyé après sa mise en forme puisqu'il n'est pas au contact du liquide d'hydroformage, les deux parties 20 A et 20 B de la pièce de remplissage étant étanches.An advantage of using the coin filling 20 for securing the profile 6 against the walls of its channel-shaped housing, consists of that the profile does not need to be cleaned after its installation in shape since it is not in contact with the hydroforming liquid, the two parts 20 A and 20 B of the piece of filling being waterproof.

La figure 6 montre que l'on peut effectuer dans le profilé 6 des déformations concaves au moyen de poinçons tels que 27, la pièce de remplissage élastique 20 jouant alors le rôle de coussin d'emboutissage.Figure 6 shows that one can perform in the profile 6 of concave deformations by means of punches such as 27, the elastic filling piece 20 playing then the role of stamping cushion.

La mise sous pression du canal 21 peut s'effectuer à volonté préalablement, simultanément ou successivement avec une opération d'étirage par les mors 4,5 au moyen des vérins 6,7.The pressurization of channel 21 can be carried out at will before, simultaneously or successively with a drawing operation by the jaws 4.5 by means of the jacks 6.7.

Les figures 8 et 9, équivalentes respectivement aux figures 6 et 7, montrent le cas du cintrage et du formage d'un profilé 6 à section ouverte.Figures 8 and 9, respectively equivalent to Figures 6 and 7 show the case of bending and forming of a section 6 with open section.

La figure 10 montre une variante dans laquelle la pression-expansion de la pièce de remplissage 20 est effectuée, non pas par pression hydraulique, mais par le moyen d'un piston de compression 28 usiné au profil intérieur du profilé. Ce piston s'appuie directement contre la pièce de remplissage élastique 20 et il comporte une queue 29 traversant un insert métallique 30 servant au serrage des mors 5. La compression-expansion est assurée par le moyen d'un effort de poussée F exercée sur le piston 28 par un moyen connu quelconque.Figure 10 shows a variant in which the pressure-expansion of the filling part 20 is performed, not by hydraulic pressure, but by the by means of a compression piston 28 machined to the profile inside of the profile. This piston rests directly against the elastic filling part 20 and it has a tail 29 passing through a metal insert 30 used for clamping of the jaws 5. The compression-expansion is ensured by the means of a thrust force F exerted on the piston 28 by any known means.

Cette variante peut notamment être utilisée lorsque le profilé 1 à former est de courte longueur. Dans cette variante, la pièce de remplissage élastique 20 est en une seule partie. L'effort F peut ne s'effectuer que par une seule extrémité, auquel cas, l'autre extrémité est fermée par un insert métallique de serrage des mors 4, pleins, sans trou de passage de queue de piston, la pièce de remplissage s'appuyant directement contre cet insert.This variant can in particular be used when the profile 1 to be formed is short in length. In this variant, the elastic filling part 20 is in one only part. The effort F can be carried out only by a single end, in which case the other end is closed by a metal insert for clamping the jaws 4, solid, without piston tail hole, filler piece leaning directly against this insert.

La pièce de remplissage élastique 20 est par exemple en élastomère tel que du polyuréthanne. Selon l'épaisseur du profilé, la pression hydraulique envoyée peut être comprise entre quelques dizaines de bars et quelques milliers de bars.The elastic filling part 20 is for example an elastomer such as polyurethane. Depending on the thickness of the profile, the hydraulic pressure sent can be understood between a few dozen bars and a few thousand bars.

Claims (4)

Equipement pour le formage de profilés métalliques (6) sur une machine à cintrer par étirage sur laquelle un profilé à former est pris à ses extrémités par des mors (4, 5) liés à des vérins d'étirage 7, 8 et à des moyens de cintrage (9, 10, 13, 14) contre une forme convexe (3) fixée sur une table porte-outils (2) de la machine, caractérisé en ce qu'il comprend une contre-forme (15) et des moyens (16, 17) pour l'appliquer contre ladite forme (3) une fois le profilé (6) cintré contre la forme (3), une pièce de remplissage (20) en matériau élastique étant prévue pour être placée à l'intérieur dudit profilé (6) et des moyens étant prévus pour soumettre ladite pièce de remplissage à une pression-expansion de manière à ce qu'elle applique fortement le profilé contre les surfaces internes de la forme et de la contre-forme fermées l'une contre l'autre.Equipment for forming metal profiles (6) on a stretch bending machine on which a profile to be formed is taken at its ends by jaws (4, 5) linked to stretching cylinders 7, 8 and to means bending (9, 10, 13, 14) against a fixed convex shape (3) on a machine tool table (2), characterized by what it includes a counterform (15) and means (16, 17) to apply it against said form (3) once the profile (6) bent against the form (3), a piece of filling (20) of elastic material being provided for be placed inside said profile (6) and means being provided for subjecting said filling part to pressure-expansion so that it applies strongly against the internal surfaces of the form and counter-form closed against each other. Equipement selon la revendication 1, caractérisé en ce que ladite pièce de remplissage (20) en matériau élastique est en deux parties distinctes (20 A, 20 B) se touchant bout à bout une fois introduites dans le profilé, chaque partie de ladite pièce de remplissage comportant un canal (21) débouchant à une seule extrémité et étant borgne à l'extrémité opposée, l'extrémité où le canal (21) débouche étant lié à un insert métallique (22) de serrage des mors et d'alimentation en pressions hydrauliques et équipé d'un moyen de raccordement (23) à des moyens hydrauliques (24, 25) de mise en pression, ledit insert métallique (22) pénétrant dans l'extrémité correspondante du profilé.Equipment according to claim 1, characterized in that said filling piece (20) of material elastic is in two separate parts (20 A, 20 B) touching end to end once introduced into the profile, each part of said filling part comprising a channel (21) opening at one end and being blind at the opposite end, the end where the channel (21) opens out being linked to a metal insert (22) for clamping the jaws and hydraulic pressure supply and equipped with a connection means (23) to hydraulic means (24, 25) for pressurizing, said metal insert (22) penetrating into the corresponding end of the profile. Equipement selon la revendication 1, caractérisé en ce que lesdits moyens pour soumettre la pièce de remplissage (20) à une pression-expansion comprend un piston de compression (28) usiné au profil intérieur du profilé, ledit piston étant soumis à une poussée F par un moyen quelconque.Equipment according to claim 1, characterized in what said means for submitting the filling piece (20) at a pressure-expansion includes a piston compression (28) machined on the inside profile of the profile, said profile piston being subjected to a thrust F by any means. Equipement selon l'une des revendications 1 à 3, caractérisé en ce que ladite contre-forme (15) et éventuellement aussi ladite forme (3) comporte (nt) un évidement (26).Equipment according to one of claims 1 to 3, characterized in that said counterform (15) and possibly also said form (3) includes (s) a recess (26).
EP97401964A 1996-08-30 1997-08-21 Apparatus for forming metal sections Expired - Lifetime EP0826440B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9610620A FR2752756B1 (en) 1996-08-30 1996-08-30 EQUIPMENT FOR FORMING METAL PROFILES
FR9610620 1996-08-30

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EP0826440A1 true EP0826440A1 (en) 1998-03-04
EP0826440B1 EP0826440B1 (en) 2003-07-02

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US (1) US5771730A (en)
EP (1) EP0826440B1 (en)
JP (1) JPH1085844A (en)
KR (1) KR19980019153A (en)
CA (1) CA2213687A1 (en)
DE (1) DE69723172T2 (en)
ES (1) ES2202563T3 (en)
FR (1) FR2752756B1 (en)

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EP0856367A2 (en) * 1997-01-31 1998-08-05 Aluminum Company Of America Stretch forming metal bodies with polymeric internal mandrels
CN104307948A (en) * 2014-09-26 2015-01-28 北京北方车辆集团有限公司 Rectangular hollow steel profile stretch bending forming method and special clamping device thereof

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US7069761B2 (en) * 2004-05-05 2006-07-04 The Boeing Company Gripping apparatus and method
DE102005013689B3 (en) * 2005-03-21 2006-01-05 Forschungsgesellschaft Umformtechnik Mbh Separating or piercing device for workpiece deformed by internal pressure has elastic membrane subject to pressure for separating or piercing
US7340933B2 (en) * 2006-02-16 2008-03-11 Rohr, Inc. Stretch forming method for a sheet metal skin segment having compound curvatures
WO2009078158A1 (en) * 2007-12-18 2009-06-25 K & I Inc. Pipe shaping method
DE102011101231A1 (en) * 2010-06-15 2011-12-15 Kiefel Gmbh Method and apparatus for stretching and forming a film blank and product made therewith
KR101298018B1 (en) * 2012-12-06 2013-08-26 김환조 Forming machine provided with servo motor and reducer
KR101465997B1 (en) * 2012-12-13 2014-11-27 주식회사 성우하이텍 Clamping device for bending press
TWI528725B (en) 2013-05-06 2016-04-01 國立中山大學 Wideband frequency synthesizer and frequency synthesizing method thereof
CN104525646A (en) * 2014-11-26 2015-04-22 安徽科瑞科技发展有限公司 Stretching-bending device and stretching-bending machine
CN105598227B (en) * 2016-03-29 2018-06-12 王志中 A kind of integral type stretch benders
KR101972063B1 (en) * 2017-09-29 2019-04-24 동의대학교 산학협력단 Bending machines and bending process
DE102017218420A1 (en) * 2017-10-16 2019-04-18 Bayerische Motoren Werke Aktiengesellschaft Method for producing a component
US11318520B2 (en) * 2018-12-30 2022-05-03 John Ralph Stewart, III Stretch forming method for a sheet metal skin with convex and concave curvatures
CN110385358B (en) * 2019-07-25 2024-05-14 凌云工业股份有限公司汽车零部件研发分公司 Forming die of S-shaped aluminum alloy section bar bumper for automobile
CN111872184A (en) * 2020-08-07 2020-11-03 大连交通大学 Auxiliary stretch bending device and method based on high-frequency composite vibration
CN112474933A (en) * 2021-01-06 2021-03-12 长春工业大学 Three-dimensional hot stretch bending forming device based on multi-degree-of-freedom mold structure
CN114247787A (en) * 2021-12-17 2022-03-29 中航贵州飞机有限责任公司 Machining method for maintaining molded surface for numerical control stretch bending of channel-shaped part
CN114850304B (en) * 2022-04-28 2022-12-16 北京航空航天大学 Combined forming method of aviation variable cross-section curvature component
DE102022114972A1 (en) * 2022-06-14 2023-12-14 Uniflex - Hydraulik GmbH Method for multi-axial forming of a hollow workpiece

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EP0856367A3 (en) * 1997-01-31 2001-01-31 Aluminum Company Of America Stretch forming metal bodies with polymeric internal mandrels
CN104307948A (en) * 2014-09-26 2015-01-28 北京北方车辆集团有限公司 Rectangular hollow steel profile stretch bending forming method and special clamping device thereof

Also Published As

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JPH1085844A (en) 1998-04-07
DE69723172D1 (en) 2003-08-07
ES2202563T3 (en) 2004-04-01
EP0826440B1 (en) 2003-07-02
FR2752756A1 (en) 1998-03-06
US5771730A (en) 1998-06-30
CA2213687A1 (en) 1998-02-28
FR2752756B1 (en) 1998-10-09
DE69723172T2 (en) 2004-04-15
KR19980019153A (en) 1998-06-05

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