EP1483069A1 - Procede de formage d'un profile creux monochambre ou multichambre courbe au moyen d'une pression interne elevee - Google Patents

Procede de formage d'un profile creux monochambre ou multichambre courbe au moyen d'une pression interne elevee

Info

Publication number
EP1483069A1
EP1483069A1 EP03708118A EP03708118A EP1483069A1 EP 1483069 A1 EP1483069 A1 EP 1483069A1 EP 03708118 A EP03708118 A EP 03708118A EP 03708118 A EP03708118 A EP 03708118A EP 1483069 A1 EP1483069 A1 EP 1483069A1
Authority
EP
European Patent Office
Prior art keywords
hollow body
cross
bending
slide element
hollow profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03708118A
Other languages
German (de)
English (en)
Inventor
Markus Gehrig
Christian Leppin
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.)
3A Composites International AG
Original Assignee
Alcan Technology and Management Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcan Technology and Management Ltd filed Critical Alcan Technology and Management Ltd
Priority to EP03708118A priority Critical patent/EP1483069A1/fr
Publication of EP1483069A1 publication Critical patent/EP1483069A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • 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
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/283—Making U-pieces
    • 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

Definitions

  • the present invention relates to a method for producing curved hollow bodies with inner and outer arches forming inner and outer arch wall regions, an initial hollow body being bent and converted into its final cross-sectional shape in one IHU tool by means of one or more internal high-pressure forming (IHU) methods.
  • IHU internal high-pressure forming
  • the invention further relates to a device for reshaping curved starting hollow bodies into an end cross-sectional shape or a cross-sectional shape approximating the end cross-section by means of an internal high pressure (IHU) method.
  • the starting hollow body has a bend-friendly cross-section at least at the bending section, in which wall material is closer to the stress-neutral surface with respect to bending stress due to a specific cross-sectional shape than in the final cross-sectional shape, containing an IHU tool that receives the bent starting hollow body.
  • the invention encompasses the use of the product produced by the method according to the invention.
  • the production of high quality, curved or curved hollow bodies is associated with some difficulties.
  • the hollow body should have a wall thickness that is as uniform as possible, in particular in the region of curvature, and in particular should not have any weak zones such as cracks or folds caused by forming steps.
  • the curved hollow bodies should be economical and time-efficient to produce in as few cold forming process steps as possible.
  • a straight starting hollow profile is generally used, which is bent in a predetermined bending radius and angle using a conventional bending method.
  • Bending is to be able to maintain the profile cross-section in the bending area. So It is known, for example, to keep the cross-sectional shape in the bending region by inserting mandrels that are flexible in the bending direction, such as finger mandrels. However, this leads to strong expansions in the wall of the outer arch and consequently to thinning of the profile wall there up to the formation of cracks, while there is strong compression in the area of the inner arch wall and consequently to compression of the profile wall and even wrinkling.
  • hydroforming processes for the shaping of hollow profiles
  • new possibilities have opened up in recent years to produce curved profiles of high quality.
  • the IHU process is characterized in that a hollow profile is transformed into the shape of the tool cavity into which the hollow profile was previously inserted by means of an internal high pressure created by an active medium in the profile cavity. In this way, for example, the cross-sectional shape of a hollow profile can be changed.
  • the modified manufacturing process for the production of curved hollow bodies is characterized by a sequential execution of a bending and IHU process.
  • a straight starting hollow profile with a cross section which is easy to bend and which does not yet correspond to the final cross section of the finished hollow profile is bent by means of a conventional bending method.
  • the curved initial hollow profile is converted into the final cross-sectional shape.
  • the production process mentioned has the advantage that the cross section of the initial hollow profile to be bent no longer necessarily has to correspond to the cross section of the final shaped and curved final hollow profile. This allows the mechanical loads and the deformation of the profile walls in the bending section to be markedly reduced during the bending process by means of an ideal cross-sectional shape.
  • the result of these advances are curved hollow profiles, which also have excellent mechanical properties in the bending section and meet optical requirements.
  • the object of the present invention is therefore to propose a method and a device for carrying out the method, which allow curved hollow bodies, in particular simple hollow profiles, to be produced with small bending radii and large bending angles.
  • the hydroforming tool contains a slide element which is movably arranged in the inner arch wall region of the curved starting hollow body and which at least partially abuts the inner arch wall region, and the slide element is moved back out of the inner arch wall region in the direction of the bend opening during the hydroforming process that the inner arch wall region of the curved starting hollow body is pushed in the direction of the retracting slide element by the internal high pressure.
  • the device is characterized in that the hydroforming tool contains a slide element arranged on the inner arc wall area of the curved starting hollow body, and the slide element can be moved back in the direction of the bend opening.
  • the starting hollow body i.e. the hollow body before the bending and hydroforming process is preferably a single or multi-chamber profile, in particular a simple hollow profile.
  • the starting hollow body or the starting hollow profile is expediently made of metal, preferably steel, aluminum or an aluminum alloy.
  • the initial hollow profile is preferably a straight hollow profile.
  • the initial hollow profile has a cross section that is easy to bend, at least on its or its bending sections.
  • the initial hollow profile can also have a cross section which is easy to bend over its entire length, the cross-sectional shape and / or size preferably being constant over the entire length of the hollow profile.
  • Bend-friendly means that the wall material is guided as close as possible to the neutral surface with regard to bending stress, also called the stress-neutral surface, due to the specific shape of the profile cross-section, so that the lowest possible deformation forces such as tensile and compressive forces are exerted on the wall material. In this way, a low moment of inertia can be achieved.
  • the neutral surface leads through the profile center line.
  • the wall material of a cross section that is easy to bend is therefore placed near the center line of the profile.
  • Bending-friendly cross-sections are therefore characterized by flat cross-sectional shapes with a relatively large height to width ratio. Such shapes can e.g. correspond to flat squatting profiles. Furthermore, the cross-sectional shapes can be of elliptical or oval shape. Furthermore, the profile cross-section can have flank walls curved inwards in the direction of the neutral surface, e.g. in the form of indentations or indentations.
  • the bend-friendly cross section is preferably a rounded profile cross section with indentations or indentations formed on both sides and opposite in the direction of the stress-neutral surface, by means of which a kind of constriction or waist is produced, the narrowest point of the waist preferably lying at the level of the profile center line.
  • Such a bend-friendly cross-section can be present, for example, in the shape similar to an hourglass, the size of the central constriction being able to vary as desired.
  • the initial hollow profile can be an extruded profile, which is preferably produced directly by means of extrusion with a bending-friendly cross-sectional shape.
  • the starting hollow profile can also consist of a formed and joined, in particular welded, rolled product, such as sheet metal.
  • Said starting hollow profile can be produced with the cross section that is easy to bend or can be converted into a cross section that is easy to bend in a subsequent process step.
  • the production of a bend-friendly cross section can also be an integral process step of the bending process, the starting hollow profile being converted into the cross section which is easy to bend using appropriate tools immediately before the bending.
  • Suitable bending processes are e.g. Drawing bending, such as rotary drawing bending, pressure drawing bending, press bending, stretch bending or roll bending.
  • the bending process can also be supported with a flexible mandrel insert in the profile cavity.
  • guiding and fixing aids such as clamping jaws, bending rollers, slide rails and / or smoothers can support the bending process.
  • the curved starting hollow profile can be bent one or more times, whereby the bending axes can be parallel or at an angle to one another.
  • the curved starting hollow profile can e.g. have an S-shape with parallel bending axes.
  • the curved hollow profile which is formed into its final cross-section by means of hydroforming processes, hereinafter referred to as the final hollow profile, has a cross-sectional contour viewed from the outside in a convex arc shape, viewed from the outside, in a preferred embodiment.
  • the end hollow profile is of tubular shape with a preferably circular, elliptical or oval cross section, at least in the bending section.
  • the end cross-section of the end hollow profile can optionally also contain corners in the outer and / or inner arch wall area.
  • the developed circumferential length of the bend-friendly cross section of the starting hollow profile can be smaller, larger and preferably of the same order of magnitude as the developed cross-sectional circumferential length of the end hollow profile.
  • the mean bending radius R m extends from the bending axis to the profile center line.
  • the bending angle can be in the range from greater than 0 ° to 180 ° (angle degrees).
  • the bending angle is preferably in the range from 40 ° to 180 °, advantageously from 60 ° to 180 ° and in particular in the range from 90 ° to 180 °.
  • the IHU tool according to the invention contains a basic tool with expediently two or more tool parts or tool halves, the basic tool partially, ie preferably at least in the outer arch wall region, which forms the tool cavity receiving the curved initial hollow profile.
  • the contour of the tool cavity in the outer arch wall area can be the contour of the end hollow profile, the contour of the curved starting hollow profile or a contour lying between these two shapes.
  • the forming tool contains a movable slide element, which at least partially forms the contour of the tool cavity in the inner arch wall area.
  • the slide element performs the function of a counterhold.
  • the contour of the slide element, which at least partially forms the inner arch wall region of the tool cavity, is preferably opposite to the contour of the curved initial hollow profile in the inner arch wall region.
  • the slide element preferably has a convex surface shape that fits into the indentation.
  • the slide element preferably extends from the inner arch area back to the bend opening.
  • the slide element forms the contour of the tool cavity at least over part of the surface both in the inner arch wall area and in the adjacent wall sections of the adjacent hollow profile legs. Said contour is preferably opposite to the cross-sectional shape of the curved starting hollow profile on said wall sections. In this way it is avoided that the slide element is blocked when moving back in the direction x of the bend opening due to the expansion of the profile wall in the wall section of the hollow profile leg.
  • the slide element is adapted to the curvature of the inner arch and has an arch-shaped end.
  • the slide element has a tongue-shaped configuration.
  • the slide element is preferably of such a nature that it is able to withstand the forces generated by the internal high pressures to oppose and in this way it is able to support the inner arch wall area.
  • the slide element is expediently displaceable, e.g. linearly displaceable, and preferably displaceable in the direction of the bend opening x.
  • the slide element is also preferably connected to a guide device guiding the slide element.
  • the guide device can optionally contain a drive unit.
  • the slide element is preferably guided between an upper and lower half of the tool.
  • the curved hollow starting profile which is present at least in the bending section in a bending-friendly cross-sectional shape, is inserted into the cavity of a basic tool.
  • an internal high pressure is applied, the initial hollow profile in the outer arch wall area being pressed into the contour of the tool cavity.
  • the slide element is moved back in the direction x of the bend opening by a certain path length from the inner arch wall area, the inner arch wall area adjacent to the slide element being pushed up by the internal high pressure.
  • the internal high pressures can e.g. 500-2000 bar.
  • the present hollow profile now has a cross-sectional shape corresponding to or approximating the end cross section of the end hollow profile in the inner arch wall region.
  • the hollow profile is subsequently placed in a further forming tool, the tool cavity of which corresponds to the cross section of the end hollow profile.
  • the hollow profile is now transferred to its final cross-section.
  • the optimal design of the slide element can also provide that the final cross section of the hollow profile is already achieved in the first hydroforming step.
  • the method according to the invention allows the production of bent tubes with large bending angles and extremely small bending radii.
  • the use of a slide element according to the invention allows the material flow in the inner arch wall region of the hollow profile triggered by the cross-sectional process to be controlled in a targeted manner.
  • all material flow in the direction of expansion of the profile cross-section, ie in the radial direction, took place in the IHU cross-sectioning process.
  • a slide element which controls the radial material flow in a targeted manner, a lateral material flow is generated along the surface of the slide element in the direction of the wall regions of the profile legs adjacent to the inner arch wall region. The wall thickening in the inner arch area is thus reduced and wrinkle formation is thereby excluded.
  • the method according to the invention therefore makes it possible to produce hollow profiles, in particular tubular hollow profiles with very small bending radii and high bending angles, which cannot be achieved using the conventional methods. Furthermore, the method according to the invention allows the use of hollow profiles with comparatively small wall thicknesses and thus the saving of material.
  • charge air pipes or intake pipes for internal combustion engines preferably for internal combustion engines of vehicles
  • the internal combustion engines on which the charge air pipes mentioned are used are preferably internal combustion engines based on the gasoline or diesel principle, in particular naturally aspirated engines, turbocharged or supercharged engines.
  • Pipes bent once or more than once with the method according to the invention can also be used as body components, e.g. Space frame components, engine mounts, chassis components, components for exhaust systems, e.g. Manifold, as well as construction or structural elements for e.g. Support bars, protective bar or roll bar.
  • body components e.g. Space frame components, engine mounts, chassis components, components for exhaust systems, e.g. Manifold, as well as construction or structural elements for e.g. Support bars, protective bar or roll bar.
  • single or multiple bent pipes produced with the method according to the invention can be used for all types of piping, e.g. for transferring liquids and gases under pressure, such as hydraulic lines, as railings and for other applications in vehicle, ship and aircraft construction as well as in building construction or civil engineering.
  • FIG. 3 shows a perspective view of a first IHU process according to the invention
  • 4a-c a perspective view of a second hydroforming process for producing the end hollow profile
  • FIGS. 1 - 7 show representations from process simulations, the Gittemetz contours corresponding to the central surfaces of the forming bodies or the surfaces of the forming tools.
  • the figures consequently reproduce only schematically simplified illustrations to illustrate the method and device according to the invention.
  • the exemplary embodiment shown below with reference to FIGS. 1-7 relates to the production of end hollow profiles with a circular cross section and a bending angle of 180 °.
  • the hollow profiles shown are merely cutouts from an arbitrarily longer hollow profile with, for example, straight or further curved profile sections.
  • FIG. 1 shows how a curved starting hollow profile 10a (FIG. 2) is produced from a formerly straight starting hollow profile 5, for example an extruded profile with a cross section that is easy to bend, by means of a conventional bending process, the associated bending device 1 being a slide rail 2 guiding the starting hollow profile 5 and contains a bending roller 4 which bends the initial hollow profile 5.
  • the initial hollow profile 5 is fixed to the bending roller 4 by means of a clamping jaw, which subsequently bends the fixed initial hollow profile 5 by means of a rotational movement.
  • the initial hollow profile 5 is guided in the slide rail 2 in the direction of the bending roller 4 during the bending process.
  • the starting hollow profile 5 has a cross section which is easy to bend and which is produced, for example, by means of a forming process or directly by the extrusion process.
  • the production of the initial hollow profile 5 with a cross section that is easy to bend and the bending process are independent of subsequent process steps 5 in which the curved initial profile 10a is shaped into the cross-sectional shape of the final hollow profile 10g. This means that other bending methods can also be used.
  • the curved starting hollow profile 10a has a particularly preferred cross-sectional shape which is easy to bend and which is mirror-symmetrically arranged by two
  • the curved starting hollow profile 10a has an outer arch with an outer arch wall region 11 and an inner arch with an inner arch wall covering.
  • FIG 3 shows the arrangement of a part of the IHU tool after completion of a first IHU process.
  • the hollow profile 10e lies in a lower half of the tool
  • a slide element 21 is introduced, which has been moved back in the course of the process in the direction x of the bend opening by a certain path length and has now reached its end position, so that the inner arch wall area adjacent to the slide element 21 in the direction
  • Expand 25 x of the retracting slide element 21 and assume a contour approximated to the end hollow profile.
  • the slide element 21 has a tongue-like shape corresponding to the curvature of the inner arch wall region in plan view.
  • the hollow profile 10e is placed in a second hydroforming tool (FIG. 4a-c), which specifies the final contour of both the inner wall and the outer arch wall area.
  • the outer arch wall area of the hollow profile 10e is already formed into the contour of the end hollow profile, which is represented by the tool cavity.
  • the inner arch wall section in the area of the greatest curvature is expanded approximately into the cross-sectional shape of the end hollow profile (FIG. 4a).
  • the hollow profile 10e is now through High pressure transferred into the cross-sectional shape of the end hollow profile 10g (Fig. 4b-c). For reasons of illustration, only the lower tool half 32b of the hydroforming tool is shown schematically.
  • FIG. 5a-f show step by step the execution of the first IHU process according to the invention in a cross-sectional view along the line AA in FIG. 3.
  • a curved hollow profile 10a (see also FIG. 2) with a cross section according to FIG. 2 that is easy to bend is placed in a forming tool 22 forming a cavity with an upper 22a and lower 22b tool half and closed.
  • a slide element 21, which forms the cavity wall over at least one wall region of the inner arch wall, is advanced before, after or with the closing of the two tool halves 22a, b to the inner arch wall region of the curved starting hollow profile 10a.
  • the contour of the slide element 21 which lies against the inner arch wall region of the starting hollow profile 10a is opposite to the contour of the concave inner arch wall region.
  • the said contour of the slide element 21 corresponds in cross section to a toroidal surface.
  • an internal high pressure is applied in the profile cavity 43, the outer arc wall area of the hollow profile 10b being pressed into the contour of the tool cavity in a first step, the tool cavity in the outer arc wall area having the contour of the final hollow profile.
  • the slide element 21 is subsequently retracted in the direction x of the bend opening, the inner arch wall area being pushed towards the slide element 21 by the persistent internal high pressure and the contour of the end hollow profile increasingly approaching or assuming this (FIGS. 5b-f).
  • the hollow profile 10e which is approximated in the inner arch wall region of the final shape is removed (see also FIGS. 3, 4a) and is introduced into a second IHU tool 32 with upper and lower tool halves 32a, 32b.
  • the second IHU tool 32 has the contour of the end hollow profile 10g, that is to say both in the inner arch wall area and in the outer arch wall area.
  • the hollow profile 10e, 10f is now shaped into the contour of the end hollow profile 10g.
  • the outer arch wall region 11, 61 can also only be formed into the cross-sectional shape of the end hollow profile 10g in the second IHU process step. That is, the hydroforming tool 22 working with the slide element 21 has in the outer arch wall region 11 the contour of the curved initial hollow profile 10a or a contour which lies between the initial hollow profile 10a and the final hollow profile 10g.
  • FIG. 7 shows a top view of the bent end hollow profile 10g which has been shaped into a circular cross section (see also FIG. 4c).
  • the bending surface or line 65 also forms the profile center line and is also the reference surface for the bending radius R m .
  • the grid lines 63 reproduce the material flow within the profile walls, with grid lines closely pushed together for accumulation and grid lines arranged far apart from each other for reducing the wall material.
  • the end hollow profile 10g has a remarkable material flow 66 (arrows) from the inner arch wall area 62 in the direction x of the bend opening, ie in the direction of the two adjacent profile legs 67a, 67b.
  • Said material flow is brought about by the aforementioned slide element 21, in that the wall material is forced to flow outward from the inner arch wall area 62 outward from the inner arch wall area 62 in the direction of the wall of the profile legs 67a, 67b along the abutting surface of the slide element 21 and the counterforce of the slide element 21 ,
  • the wall material of the inner arch wall region 62 is also guided outwards in a controlled manner in the radial direction, approximating the cross-sectional shape of the end hollow profile 10g, folding being prevented in the inner arch wall region 62 due to the simultaneous flow of material in the direction of the profile legs 67a, 67b.
  • the thickening of the wall can be reduced by the method according to the invention.
  • FIG. 8 shows a graphic representation 50 with regard to the areas of application of 90 ° bends on tube profiles made of a typical aluminum alloy as a function of tube diameter, bending radius and wall thickness.
  • the ratio of the mean bending radius R m to the outside pipe diameter D is plotted on the horizontal axis and the ratio of the outside pipe diameter D to the wall thickness t is plotted on the vertical axis.
  • the hatched area 51 represents the executable area with respect to a 90 ° bend, the feasibility relating to a conventional bending method.
  • the area beyond a hatched area delimited by a straight line represents the non-executable area in which a successful bending process is no longer guaranteed.
  • a pipe to be bent has a diameter D of 20 and a wall thickness of 1, then according to FIG. 8 a 90 ° bend with a bending radius of 40 can be carried out on the said pipe, since the ratio Rm / D 2 and the ratio D / t is 20 and the corresponding intersection is therefore in the hatched area.
  • R m a bending radius of 30 with the pipe dimensions remaining the same, the intersection falls into a range that cannot be carried out, ie the pipe is likely to fail during bending.

Landscapes

  • 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

L'invention concerne un procédé de production de corps creux courbés (10g) pourvus d'un arc interne et d'un arc externe. Un corps creux de départ présentant une forme flexible en coupe transversale au moins sur le tronçon de flexion est courbé et transformé de façon à prendre sa forme finale en coupe transversale, au cours d'une ou de plusieurs étapes de formage d'un procédé de formage à pression interne élevée (IHU). L'outil correspondant audit procédé IHU comprend, dans la zone de paroi de l'arc interne (62) du corps creux de départ (10a) courbé, un élément coulissant (21) mobile qui, au début du procédé de formage, oppose une résistance à ladite zone de paroi de l'arc interne (62) et qui, au cours dudit procédé IHU, est retiré de la zone de paroi de l'arc interne (62), de façon que ladite zone de paroi de l'arc interne (62) du corps creux soit poussée vers l'extérieur par la pression interne élevée en direction de l'élément coulissant (21) qui décrit un mouvement de retrait. Le retrait de cet élément coulissant (21) et la pression interne élevée sont régulés de façon que la matière de paroi soit déplacée de la zone de paroi de l'arc interne (62) en direction de la zone de paroi du corps creux adjacente qui est éloignée du tronçon de flexion.
EP03708118A 2002-03-01 2003-02-21 Procede de formage d'un profile creux monochambre ou multichambre courbe au moyen d'une pression interne elevee Withdrawn EP1483069A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03708118A EP1483069A1 (fr) 2002-03-01 2003-02-21 Procede de formage d'un profile creux monochambre ou multichambre courbe au moyen d'une pression interne elevee

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP02405154A EP1340558A1 (fr) 2002-03-01 2002-03-01 Méthode de formage à haute pression interne d' un profilé courbé creux à une ou plusieurs chambres
EP02405154 2002-03-01
PCT/EP2003/001775 WO2003074207A1 (fr) 2002-03-01 2003-02-21 Procede de formage d'un profile creux monochambre ou multichambre courbe au moyen d'une pression interne elevee
EP03708118A EP1483069A1 (fr) 2002-03-01 2003-02-21 Procede de formage d'un profile creux monochambre ou multichambre courbe au moyen d'une pression interne elevee

Publications (1)

Publication Number Publication Date
EP1483069A1 true EP1483069A1 (fr) 2004-12-08

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP02405154A Withdrawn EP1340558A1 (fr) 2002-03-01 2002-03-01 Méthode de formage à haute pression interne d' un profilé courbé creux à une ou plusieurs chambres
EP03708118A Withdrawn EP1483069A1 (fr) 2002-03-01 2003-02-21 Procede de formage d'un profile creux monochambre ou multichambre courbe au moyen d'une pression interne elevee

Family Applications Before (1)

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EP02405154A Withdrawn EP1340558A1 (fr) 2002-03-01 2002-03-01 Méthode de formage à haute pression interne d' un profilé courbé creux à une ou plusieurs chambres

Country Status (4)

Country Link
US (1) US20050097935A1 (fr)
EP (2) EP1340558A1 (fr)
AU (1) AU2003212258A1 (fr)
WO (1) WO2003074207A1 (fr)

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DE102007013902A1 (de) * 2007-03-20 2008-09-25 Universität Dortmund Vorrichtung zum Profilbiegen
JP7164871B2 (ja) * 2018-12-27 2022-11-02 ヒルタ工業株式会社 自動車用クロスメンバ

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US20050097935A1 (en) 2005-05-12

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