EP1144139B1 - Procede et dispositif d'hydroformage d'un element tubulaire - Google Patents
Procede et dispositif d'hydroformage d'un element tubulaire Download PDFInfo
- Publication number
- EP1144139B1 EP1144139B1 EP99957778A EP99957778A EP1144139B1 EP 1144139 B1 EP1144139 B1 EP 1144139B1 EP 99957778 A EP99957778 A EP 99957778A EP 99957778 A EP99957778 A EP 99957778A EP 1144139 B1 EP1144139 B1 EP 1144139B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- elementary
- core
- tubular member
- hydroforming
- mould
- 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.)
- Expired - Lifetime
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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
- 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
- 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
- B21D26/039—Means for controlling the clamping or opening of the moulds
Definitions
- the subject of the present invention is a method and a hydroforming device for a tubular element, plus particularly of a tubular element essentially straight, according to the preambles of claims 1 and 5.
- Hydroforming techniques are well known and are growing in popularity due to the fact that they allow, in a single step, to achieve complex shapes from a blank in the form of a tubular element.
- the adequately sealed blank is held in a matrix made up of two half-shells appropriately shaped and hydroformed by injecting high pressure fluid into the blank while the die is kept closed with a hurry.
- the object of the present invention is to make it possible to make use of hydroforming techniques for the production, from tubular elements, hydroformed elements essentially straight, without requiring the setting important material for the maintenance of closed matrix. It also aims to allow the realization by hydroforming, in one step, of long pieces.
- the method of the invention which consists in a hydroforming process in which a hydroforming fluid is injected under pressure into a rectilinear tubular element made otherwise watertight received entirely in a matrix made up of two half-shells of suitable shape, held together to resist hydroforming forces transmitted by the tubular element, to realize the matrix in the form of a series of matrices elementary, succeeding each other in a juxtaposed way along the tubular element, in the longitudinal direction thereof, to assemble each elementary matrix individually to using retainers, retaining dies elementary in position juxtaposed in the direction longitudinal by a longitudinal blocking carried out on both sides on the other side of the matrix, and to keep assembled each elementary matrix by the reaction forces generated during hydroforming in the assembly considered.
- the retention in juxtaposed position of the dies elementary is ensured by tightening all said elementary matrices between clamping means provided at both ends of a core bar, axially passing through said tubular element.
- the hydroforming fluid is injected into the tubular element through the bar constituting core, and the sealing of the ends of the element tubular on the core is made, at each end of the core, by clamping the corresponding end of the tubular element between said end of the core and the corresponding axial clamping means.
- the ends of the element tubular are constricted on the ends cores, before tightening the corresponding axial clamping means.
- the invention also relates to a device hydroforming of a straight tubular element of the type comprising a matrix made up of two half-shells of suitable shape, held together to resist hydroforming forces, a bar, constituting at its part central an oblong core intended to be inserted in the element tubular to be subjected to hydroforming, core whose length roughly corresponds to the length of said tubular element, and at each end of the bar, means for sealing the ends of the element tubular, device which comprises, for the realization of the method of the invention, elementary matrices juxtaposed along the tubular element, forming the matrix, individual assembly means of each elementary matrix, self-locking under the effect of forces hydroforming, and at each end of the bar, fixing means for axial clamping means, the cooperating axial clamping means, on either side of end walls of the matrix consisting of the matrices elementary juxtaposed, with the said fixing means, and the sealing means cooperating with the ends of the nucleus.
- an assembly constituting a matrix elementary consists of two half-matrices whose ends are formed to constitute by their meeting, when closing the elementary matrix, tenons intended to cooperate with corresponding mortises formed in locking pieces.
- the corresponding tenons and mortises have a slight taper, sufficient to facilitate the introduction of the post in the mortise, but sufficiently reduced to allow blockage such as the forces of friction oppose expulsion, during hydroforming of the locking part in which is formed the mortise.
- an assembly constituting elementary matrix consists of two assemblies of half-dies, juxtaposed so that the plane of closure of one of the assemblies is arranged at right angles relative to the closing plane of the other assembly, and assembled by studs parallel to the axis of the die elementary thus formed, arranged on both sides of each of the assembly closure plans and fitting into corresponding housing assemblies.
- the bar comprises a cylindrical core, of diameter slightly smaller than the internal diameter of the tubular element and corresponding length substantially the length of the tubular member to hydroformer, nucleus that connects to each of its ends, by a conical shoulder, at one end threaded, while the clamping means are constituted, at each end, a nut screwing on the end threaded from the bar and a thrust plate pierced with a conical orifice to cooperate with the conical shoulder of the bar, and that at least one end of the bar is formed, through the threaded end, a conduit supply of hydroforming fluid which leads to the nucleus surface.
- a straight shoulder of low height is formed between the core and the conical shoulder.
- a hydroforming device according to the invention of a straight tubular element consists of a matrix 1, of a bar 2 constituting a through core axially a blank or tubular element 3 to hydroforming, and clamping means 4, 4 '.
- the matrix 1 consists according to the invention of a series of assemblies 5, 6 forming elementary matrices.
- Fig. 1 illustrates an assembly 5 constituting a matrix elementary, suitable for maintaining the part concerned with a tubular element in its original form.
- Such an assembly 5 consists of two partial assemblies 7, 7 ' juxtaposed with half dies 8, 8 'respectively 8 ", 8" each having a housing 9 respectively 9 'intended to receive the tubular element, and a closure plane 10, respectively 10 '.
- the partial assemblies 7, 7 ' are juxtaposed so that the closure plan 10 of the partial assembly 7 is arranged at right angles by relative to the closing plane 10 'of the partial assembly 7 '.
- the partial assemblies 7, 7 ' are brought together in the form of an assembly 5 by studs 11 inserted in the housings 12 to be arranged parallel to the axis 13 of the elementary matrix thus constituted.
- the studs are housed in a half-matrix 8 of a partial assembly 7, on the same side of the closure plane 10, are also housed in the half dies 8 ", 8" 'of the partial assembly juxtaposed 7 ', on either side of the closing plane 10'.
- Fig. 2 illustrates an assembly 6 constituting a matrix elementary, comprising a recess 14 suitable for production of an assembly form 15 of bars wire rack.
- This assembly consists of two half-dies 16, 16 ', extending into projections of semi-circular section 17, 17 'respectively 17 “, 17"', oriented perpendicular to the axis 13 'of the elementary matrix thus constituted.
- These semi-circular section projections are designed to form by their meeting 17, 17 " respectively 17 ', 17 “', a tenon of circular section intended to cooperate each time with a mortise 18 corresponding in a locking piece 19. Only one locking piece 19 with mortise 18, intended for cooperate with the tenon formed from the ends 17 ', 17 "', is shown in the drawing.
- the tenons formed by the combination of projections 17, 17 "and 17 ', 17"', and the corresponding mortises 18, have a slight taper.
- a taper of 1% is considered sufficient taper to facilitate the introduction of the tenon in the mortise, while allowing, under the effect of friction forces, a blocking of the post in the mortise during hydroforming.
- Fig. 3 shows a detail view, partially in section, from the end of a bar 2 and means for tightening 4 associated, cooperating with the blank or element tubular 3.
- the bar 2 proper consists of a cylindrical body 19, constituting a core, of diameter slightly smaller than the internal diameter of the element tubular 3 in order to leave between the core 19 and the tubular element 3, in section, an annular space of reduced size. On the one hand, this limits the amount of fluid required for hydroforming, and other apart from limiting the pressure application surface generating in the tubular element 3 the axial component some efforts.
- the cylindrical body 19 is connected, by a frustoconical shoulder 20, at a threaded end 21 intended to cooperate with the clamping means 4.
- clamping means 4 consist of a part 22 nut component, acting on a clamping plate 23.
- the clamping plate 23 is pierced with an orifice 24 for engage on the threaded end 21 of the bar 2, orifice 24 ending in a tapered portion 25 of taper corresponding to that of the shoulder 20.
- the shoulder 20 has a straight portion 26 of weak dimension making transition between the cylindrical core 19 and the frustoconical part of the shoulder 20.
- a channel supply 27 for the hydroforming fluid crosses the threaded end 21 to reach the surface of the core 19.
- the hydroforming fluid is then brought through the conduit 27 in the annular space remaining between the core 19 and the tubular element 3.
- the tubular element 3 is deformed in line with the recesses 14, the generated form being determined to use the matter available to the right of the deformation without contribution neighboring areas.
- the elementary matrices 6 are locked in the closed position by the tendency to expansion of posts 17, 17 "and 17 ', 17"' in the corresponding mortises 18.
- the elementary matrices 5 are locked in position closing by constraints perpendicular to the axis of studs 11, exerted in two perpendicular directions between them at the passage of the stud considered in the partial assembly 7 respectively in the assembly partial 7 '.
- the clamping means 4 are loose, the elementary matrix assemblies released and the ends of the hydroformed bar 28 cut out for allow removal of the bar 2.
- This hydroformed bar can then be machined so suitable for making in assembly forms 15 the cuts required to allow the introduction and welding of cylindrical bars 30 for the creation of a grid.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
- la fig. 1 est une vue en perspective d'un mode de réalisation d'un assemblage constituant matrice élémentaire, adaptée au maintien d'un élément tubulaire dans sa forme initiale,
- la fig. 2 est une vue en perspective d'un autre mode de réalisation d'un assemblage constituant matrice élémentaire, adaptée à la constitution dans l'élément tubulaire d'une forme d'assemblage,
- la fig. 3 est une vue de détail, partiellement en coupe, d'une extrémité d'une barre constituant noyau et du dispositif de serrage associé
- la fig. 4 est une vue d'ensemble, en coupe, d'un dispositif d'hydroformage suivant l'invention d'un élément tubulaire comme mentionné ci-avant, l'alimentation en fluide d'hydroformage n'étant pas représentée, et
- la fig.5 est une vue partielle d'une grille réalisée à partir d'un élément tubulaire hydroformé suivant l'invention.
Claims (10)
- Procédé d'hydroformage d'un élément tubulaire dans lequel un fluide d'hydroformage est injecté sous pression dans un élément tubulaire rectiligne (3) rendu par ailleurs étanche et reçu entièrement dans une matrice (1) constituée de deux demi-coquilles de forme appropriée, maintenues assemblées pour résister aux forces d'hydroformage transmises par l'élément tubulaire, caractérisé en ce qu'il consisteà réaliser la matrice (1) sous forme d'une série de matrices élémentaires (5, 6), se succédant de manière juxtaposée le long de l'élément tubulaire (3), dans le sens longitudinal de celui-ci,à assembler chaque matrice élémentaire (5, 6) individuellement à l'aide d'organes de retenue (11, 12, 17, 17', 17", 17"', 18)à retenir les matrices élémentaires (5, 6) en position juxtaposée dans le sens longitudinal, par un blocage longitudinal réalisé de part et d'autre de la matrice (1),à maintenir assemblée chaque matrice élémentaire (5, 6) par les forces de réaction engendrées en cours d'hydroformage dans l'assemblage.
- Procédé selon la revendication 1, caractérisé en ce que la retenue en position juxtaposée des matrices élémentaires (5, 6) est assurée par serrage de l'ensemble (1) des dites matrices élémentaires entre des moyens de serrage (4) prévus aux deux extrémités d'une barre (2) constituant noyau, traversant axialement le dit élément tubulaire (3).
- Procédé selon les revendications 1 et 2, caractérisé en ce que le fluide d'hydroformage est injecté dans l'élément tubulaire (3) au-travers de la barre (2) constituant noyau (19), et en ce que l'étanchéification des extrémités (29) de l'élément tubulaire (3) sur le noyau (19) est réalisée, à chaque extrémité du noyau (19), par serrage de l'extrémité correspondante (29) de l'élément tubulaire (3) entre la dite extrémité (20) du noyau (19) et le moyen de serrage axial (4) correspondant.
- Procédé suivant la revendication 3 caractérisé en ce que les extrémités (29) de l'élément tubulaire (3) sont rétreintes sur les extrémités (20) correspondantes du noyau (19), préalablement au serrage des moyens de serrage axial (4) correspondants.
- Dispositif d'hydroformage d'un élément tubulaire rectiligne qui comprendune matrice (1) constituée de deux demi-coquilles de forme appropriée, maintenues assemblées pour résister aux forces d'hydroformage,une barre (2), constituant à sa partie centrale un noyau (19) oblong destiné à s'insérer dans l'élément tubulaire (3) à soumettre à hydroformage, noyau (19) dont la longueur correspond sensiblement à la longueur de dit élément tubulaire,à chaque extrémité de la barre (2), des moyens d'étanchéification (23) des extrémités de l'élément tubulaire,des matrices élémentaires (5, 6) juxtaposées sur toute la longueur de l'élément tubulaire (3) et formant la matrice (1),des moyens d'assemblage individuels (11, 12, 17, 17', 17", 17"', 18) de chaque matrice élémentaire (5, 6), autobloquants sous l'action des forces d'hydroformage,à chaque extrémité de la barre, des moyens de fixation (21) pour des moyens de serrage axial (4)les moyens de serrage axial coopérant avec les dits moyens de fixation (21), de part et d'autre des parois d'extrémité de la matrice (1) constituée des matrices élémentaires juxtaposées (5, 6), etles moyens d'étanchéification (23) coopérant avec les extrémités du noyau (19).
- Dispositif suivant la revendication 5, caractérisé en ce qu'un assemblage (6) constituant matrice élémentaire est constitué de deux demi-matrices (16, 16') pourvues de saillies (17, 17', 17", 17"') formées pour constituer par leur réunion, lors de la fermeture de la matrice élémentaire (6), des tenons destinés à coopérer avec des mortaises correspondantes (18) formées dans des pièces de verrouillage (19).
- Dispositif suivant la revendication 6, caractérisé en ce que les tenons (17, 17"; 17', 17"') et les mortaises (18) correspondantes présentent une légère conicité, suffisante pour faciliter l'introduction du tenon dans la mortaise (18), mais suffisamment réduite pour permettre un blocage tel que les forces de frottement s'opposent à l'expulsion de la pièce de verrouillage (19) dans laquelle est formée la mortaise (18), au cours de l'hydroformage.
- Dispositif suivant la revendication 5, caractérisé en ce qu'un assemblage (5) constituant matrice élémentaire est constitué de deux assemblages (7, 7') de demi-matrices, juxtaposés de telle sorte que le plan de fermeture (10) d'un des assemblages (7) soit disposé à angle droit par rapport au plan de fermeture (10') de l'autre assemblage (7'), et assemblés par des goujons (11) parallèles à l'axe (13) de la matrice élémentaire ainsi constituée, disposés de part et d'autre de chacun des plans de fermeture (10, 10') des assemblages (7, 7') et s'insérant dans des logements correspondants (12) des assemblages (7, 7').
- Dispositif suivant la revendication 5, caractérisé en ce que la barre (2) comprend un noyau cylindrique (19), de diamètre légèrement inférieur au diamètre interne de l'élément tubulaire (3) et de longueur correspondant sensiblement à la longueur de l'élément tubulaire (3) à hydroformer, noyau (19) qui se raccorde à chacune de ses extrémités, par un épaulement conique (20), à une extrémité filetée (21), en ce que les moyens de serrage (4) sont constitués, à chaque extrémité, d'un écrou (22) se vissant sur l'extrémité filetée (21) de la barre et d'une plaque de poussée (23) percée d'un orifice (24) comportant une partie conique (25) pour coopérer avec l'épaulement conique (20) de la barre (2), et en ce qu'à au moins une extrémité de la barre (2) il est formé, au-travers de l'extrémité filetée (21), un conduit d'alimentation (27) en fluide d'hydroformage qui débouche à la surface du noyau (19).
- Dispositif suivant la revendication 9, caractérisé en ce que, à la transition entre le noyau (19) et l'extrémité filetée (21) de la barre (2), un épaulement droit (26) de faible hauteur est formé entre le noyau (19) et l'épaulement conique (20).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9800885 | 1998-12-09 | ||
BE9800885A BE1012328A3 (fr) | 1998-12-09 | 1998-12-09 | Procede et dispositif d'hydroformage d'un element tubulaire. |
PCT/BE1999/000158 WO2000033988A2 (fr) | 1998-12-09 | 1999-12-07 | Procede et dispositif d'hydroformage d'un element tubulaire |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1144139A2 EP1144139A2 (fr) | 2001-10-17 |
EP1144139B1 true EP1144139B1 (fr) | 2002-10-30 |
Family
ID=3891562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99957778A Expired - Lifetime EP1144139B1 (fr) | 1998-12-09 | 1999-12-07 | Procede et dispositif d'hydroformage d'un element tubulaire |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1144139B1 (fr) |
AT (1) | ATE226857T1 (fr) |
BE (1) | BE1012328A3 (fr) |
DE (1) | DE69903754D1 (fr) |
WO (1) | WO2000033988A2 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106734492B (zh) * | 2016-11-14 | 2018-11-09 | 南昌航空大学 | 一种带内筋的形状记忆合金管接头液压扩径装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR601296A (fr) * | 1925-07-24 | 1926-02-26 | Procédé et appareil pour la fabrication d'objets métalliques | |
GB392635A (en) * | 1931-12-02 | 1933-05-25 | Alexander James Middler | A method of forming outward projections on the walls of hollow forgings or tubes |
GB523962A (en) * | 1939-01-18 | 1940-07-26 | John William Edward Bettles | Improvements in tubular metal fencing standards |
GB947546A (en) * | 1961-03-02 | 1964-01-22 | Monoweld Engineering Company P | Improvements in or relating to the shaping of hollow metal articles |
ZA963053B (en) * | 1995-04-20 | 1996-12-04 | Raymond Pace | Apparatus for forming a stanchion |
DE19622372B4 (de) * | 1996-06-04 | 2006-06-01 | Htm Härtetechnik & Metallbearbeitung Gmbh | Verfahren und Vorrichtung zum Herstellen von Nockenwellen |
-
1998
- 1998-12-09 BE BE9800885A patent/BE1012328A3/fr not_active IP Right Cessation
-
1999
- 1999-12-07 DE DE69903754T patent/DE69903754D1/de not_active Expired - Lifetime
- 1999-12-07 EP EP99957778A patent/EP1144139B1/fr not_active Expired - Lifetime
- 1999-12-07 WO PCT/BE1999/000158 patent/WO2000033988A2/fr active IP Right Grant
- 1999-12-07 AT AT99957778T patent/ATE226857T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
WO2000033988A3 (fr) | 2000-10-19 |
EP1144139A2 (fr) | 2001-10-17 |
ATE226857T1 (de) | 2002-11-15 |
BE1012328A3 (fr) | 2000-09-05 |
DE69903754D1 (de) | 2002-12-05 |
WO2000033988A2 (fr) | 2000-06-15 |
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