EP1442806A1 - Apparatus for hydroforming a hollow body - Google Patents
Apparatus for hydroforming a hollow body Download PDFInfo
- Publication number
- EP1442806A1 EP1442806A1 EP04290264A EP04290264A EP1442806A1 EP 1442806 A1 EP1442806 A1 EP 1442806A1 EP 04290264 A EP04290264 A EP 04290264A EP 04290264 A EP04290264 A EP 04290264A EP 1442806 A1 EP1442806 A1 EP 1442806A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frame
- tool
- hollow body
- hydroforming
- parts
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims description 23
- 230000002706 hydrostatic effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
Images
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
- B21D26/039—Means for controlling the clamping or opening of the moulds
Definitions
- the present invention relates to a device for forming a metallic hollow body or the like by the introduction inside said hollow body of a fluid under high pressure according to a process known as hydroforming.
- the pressure of the hydroforming fluid can reach 6000 bars, the tools of these devices are particularly bulky in order to withstand the efforts pressure induced inside the mold.
- the tool is fixed and positioned under the press, the press frame as a whole being fitted with one or more cylinders for closing the tooling, so that said built is also very bulky which requires a major civil engineering which considerably increases the cost of these devices and ultimately hydroformed parts.
- the device is made up a fixed top hat and a fixed bottom base defining between them a hydroforming space intended for receive a mold assembly including a tray lower and upper plateau, both globally rectangular.
- the lower base of the device includes guidance extending from the hydroforming space to a loading-unloading position, and possibly preforming, located outside said hydroforming area.
- the device includes, for elsewhere, means for moving the mold in order to move from its loading-unloading position to its hydroforming position in space hydroforming which has just a height greater than that of the mold assembly.
- Said mandrel is suitable for being positioned at the inside of the tubular part to be formed, placed itself inside the tool which has a recess globally cylindrical central when the different tool parts are assembled.
- the source of fluid. under pressure is connected to the mandrel placed inside of the tubular part to be formed.
- This type of device has the disadvantage of not not allow the forming of parts of complex shapes, parts to be able to accommodate the mandrel.
- One of the aims of the invention is therefore to remedy all these disadvantages by proposing a device hydroforming of simple and inexpensive design to optimize the tools and reduce the size of these devices.
- a device for forming a hollow body metallic or the like by introduction inside said hollow body of a fluid under high pressure comprising on the one hand, at least one tool consisting of at least two parts respectively provided with a draft and suitable for accommodate the metal hollow body to be formed, and other share a frame consisting of a hollow part open to at minus one of its ends and able to accommodate the tool, said tool being introduced into the frame by translation along the axis of said frame;
- the piece hollow of revolution forming the frame is open to both ends to allow introduction alternately two tools, identical or not, on one side and then the other of said frame.
- the device for forming a metallic hollow body or the like comprises a frame 1 consisting of a cylindrical part comprising a concentric cylindrical central recess 2 capable of accommodating a tool 3 consisting of two semi-cylindrical mold parts 3 a , 3 b .
- Each semi-cylindrical part 3 a , 3 b comprises a draft 4 a , 4 b capable of accommodating a cylindrical metallic hollow body 5, for example, the shape of the drafts 4 a , 4 b corresponding to the shape of the part that is desired obtain, when the two parts 3 a , 3 b of the tool 3 are assembled, as indicated by the arrows a in FIG. 1.
- the tool 3 After having positioned the metallic hollow body 5 in the undercuts 4 a , 4 b of the parts 3 a , 3 b of the tool 3 which has been joined, by means, for example of jacks not shown in the figures, the tool 3 which then has a cylindrical shape is introduced into the central cylindrical recess 2 of the frame 1 by translation along the axis of revolution A, shown in dotted lines in Figure 1, of said frame 1.
- the tool 3 further comprises an inlet channel 6 extending from a first end of said tool 3 and opening into the volume delimited by the bodies 4 a , 4 b of said tool 3 and an outlet channel 7 extending from the opposite end of said tool 3 and opening into said volume delimited by the bodies 4 a , 4 b of the tool 3.
- a pressurized fluid called fluid d hydroforming is introduced through the inlet channel 6 inside the hollow body 5 positioned in the tool 3, the outlet channel 7 being closed by closing means, not shown in the figure.
- Supply means 8 supply the hydroforming fluid at a hydroforming pressure P1 of up to 6000 bars.
- the outlet channel 7 is open to allow the hydroforming fluid introduced into the tool 3 to escape, as indicated by arrow c.
- said movement for closing the tool 3 can be accompanied various preforming functions of the metal hollow body 5 with or without pressurized fluid, such as, for example, stamping, elongation of the hollow body, etc.
- the tool 3 comprises more of two parts thus forming several joint planes, at at least two separate joint planes, which allow hydroforming parts with complex shapes.
- a tool 3 comprising n parts, n being a integer preferably greater than two, present n-1 joint plans.
- the devices of the prior art comprising a hydraulic press have a single joint plane which prevents demolding of the hydroformed part which can only be carried out according to a single plan, the production of parts of complex shapes.
- the devices of the art front can obviously include drawers retractable housed in the tool, which strikes considerably the manufacturing costs of these tooling.
- the different parts of the tool 3 according to the invention include advantageously internal means such as locks in order to join two adjacent parts of the tool 3, punches or the like, driven by means of external control for the realization of forms special.
- the parts 3 a , 3 b of the tool 3 comprise hydrostatic compensation means consisting of a recess 9 a and 9 b respectively practiced on the outer surface of parts 3 a and respectively 3 b of the tool 3, said recesses 9 a , 9 b forming with the inner wall of the frame 1 a chamber 10 a , 10 b supplied with fluid under pressure, at a pressure P2 and respectively P3, the pressures P2 and P3 being identical or not, by a channel 11 a and respectively 11 b formed in said frame 1.
- the chambers 10 a , 10 b are supplied with fluid under pressure by supply means 12 a and respectively 12 b which are independent of the means for supplying pressurized fluid introduced inside the hollow body 5 positioned in the tool 3.
- the supply channels 11 a , 11 b , of the chambers of the hydrostatic compensation means 10 a , 10 b can be formed in parts 3 a and 3 b of the tool 3 without thereby departing from the scope of the 'invention.
- Each chamber 10 a , 10 b of the hydrostatic compensation means advantageously comprises a coating consisting of a membrane 13 a and respectively 13 b of hermetic synthetic material filling said chamber 10 a or 10 b in a similar manner to a balloon in order to ensure the sealing of said chamber 10 a , 10 b .
- the tool 3 comprises three parts 3 a , 3 b , 3 c consisting respectively in a cylinder section respectively provided with a draft 4 a , 4 b , 4 c able to receive the metallic hollow body 5 to be formed, the frame 1 having, in the same manner as above, a cylindrical shape comprising a central recess 2 also cylindrical. It will thus be observed that the central recess 2 of the frame 1 which has a circular section provides a perfect distribution of the hydrostatic pressures represented by the arrows d, the hydrostatic pressure which is applied to the interior wall of the frame 1 being radial, during the hydroforming of the hollow body 5.
- the frame 1 can consist of a hollow part of revolution of any section having also a central section recess any, such as, for example, ovoid, rectangular, etc ...; the tool then having a section identical to the section of the central recess 2 of the frame 1, without as well go beyond the scope of the invention.
- the frame 1 consists of a cylindrical part comprising a central frustoconical recess, the tool 3 then also having a shape truncated.
- the latter consists of a frame 1 of generally parallelepiped shape having a central recess 2 frustoconical in section in the shape of a regular hexagon, c 'is to say a central recess 2 of section in the shape of a regular hexagon whose section narrows from its upper end to its bottom, said central recess 2 being oriented upwards.
- the central recess 2 of the frame 1 is suitable for receiving a tool 3 consisting of two parts 3 a and 3 b respectively provided with a draft 4 a , 4 b in which the metal hollow body 5 to be formed is positioned.
- the device further comprises a tubular structure 14 consisting of uprights 15 of cross members 16 and side members 17 extending above the frame 1 and carrying pipes 18 for supplying pressurized fluid connected to a generator of pressurized fluid 19 controlled by a control panel 20.
- the tool 3 is introduced by vertical translation into the central recess 2 of the frame 1 by moving the frame 1 up along the uprights 15 of the structure 14 by means of hydraulic cylinders by example, not shown in FIG. 4.
- the remains 4 a , 4 b of the tool 3 can include drawing means, such as an undercut for example, which stamps the hollow body 5 during introduction of the tool 3 in the recess 2 of the frame.
- pressurized water is introduced into the hollow body 5 during said pre-forming, the pressure of the water preferably being slightly lower. to the pressure exerted by the undercut on the hollow body 5.
- tool 3 can be introduced. in the central recess 2 of the frame 1 fixed by a vertical translation of said tool 3 by means of jacks without going beyond the ambit of the invention.
- central recess 2 of frame 1 can have a regular polygon section or irregular.
- the frame 1, the central recess 2, the tool 3 include sealing means not shown in the figures as well as sensors positioned in particular in the undercuts 4 a , 4 b of the tool 3 so to measure the pressures, without departing from the scope of the invention.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
Description
La présente invention concerne un dispositif pour le formage d'un corps creux métallique ou analogue par l'introduction à l'intérieur dudit corps creux d'un fluide sous haute pression suivant un procédé dit d'hydroformage.The present invention relates to a device for forming a metallic hollow body or the like by the introduction inside said hollow body of a fluid under high pressure according to a process known as hydroforming.
Dans le domaine des dispositif d'hydroformage de corps creux métalliques notamment, communément appelés cellules d'hydroformage, on connaít bien des dispositifs constitués d'un outillage comprenant un moule en deux parties entre lesquelles est positionné le corps creux à former, ledit moule étant positionné sous une presse pour compenser la pression hydrostatique du fluide introduit à l'intérieur du corps creux.In the field of hydroforming devices metallic hollow bodies in particular, commonly called hydroforming cells, we know many devices consisting of a tool comprising a mold in two parts between which the hollow body is positioned at forming, said mold being positioned under a press to compensate for the hydrostatic pressure of the fluid introduced to inside the hollow body.
La pression du fluide d'hydroformage pouvant atteindre 6000 bars, les outillages de ces dispositifs sont particulièrement volumineux afin de résister aux efforts induits par la pression s'exerçant à l'intérieur du moule. De manière classique l'outillage est fixe et positionné sous la presse, le bâti de la presse de forme globalement parallélépipédique étant muni d'un ou plusieurs vérins pour assurer la fermeture de l'outillage, de sorte que ledit bâti est également très volumineux ce qui nécessite un génie civil important qui grève considérablement le coût de ces dispositifs et in fine des pièces hydroformées.The pressure of the hydroforming fluid can reach 6000 bars, the tools of these devices are particularly bulky in order to withstand the efforts pressure induced inside the mold. Conventionally, the tool is fixed and positioned under the press, the press frame as a whole being fitted with one or more cylinders for closing the tooling, so that said built is also very bulky which requires a major civil engineering which considerably increases the cost of these devices and ultimately hydroformed parts.
Afin de limiter l'encombrement de ces dispositifs, on a déjà imaginés des dispositifs comprenant un outillage mobile qui permet de charger la pièce à former dans le moule à l'extérieur du bâti de presse ; c'est le cas par exemple du brevet européen EP 0 686 440 décrivant un dispositif pour hydroformage. Le dispositif est constitué d'un chapeau supérieur fixe et une base inférieure fixe définissant entre eux un espace d'hydroformage destiné à recevoir un ensemble de moule comprenant un plateau inférieur et un plateau supérieur, tous deux globalement rectangulaires. La base inférieure du dispositif comprend un guidage s'étendant depuis l'espace d'hydroformage jusqu'à une position de chargement-déchargement, et éventuellement de préformage, située à l'extérieur dudit espace d'hydroformage. Le dispositif comprend, par ailleurs, des moyens de déplacement du moule afin de le déplacer depuis sa position de chargement-déchargement jusqu'à sa position d'hydroformage dans l'espace d'hydroformage qui présente une hauteur tout juste supérieure à celle de l'ensemble de moule.In order to limit the size of these devices, we has already imagined devices including a tool mobile which allows the workpiece to be loaded into the mold on the outside of the press frame; this is the case with example of European patent EP 0 686 440 describing a hydroforming device. The device is made up a fixed top hat and a fixed bottom base defining between them a hydroforming space intended for receive a mold assembly including a tray lower and upper plateau, both globally rectangular. The lower base of the device includes guidance extending from the hydroforming space to a loading-unloading position, and possibly preforming, located outside said hydroforming area. The device includes, for elsewhere, means for moving the mold in order to move from its loading-unloading position to its hydroforming position in space hydroforming which has just a height greater than that of the mold assembly.
Bien que ce type de dispositif présente un volume et un poids moindre que les dispositifs d'hydroformage à chargement sous presse, leur encombrement reste néanmoins trop important.Although this type of device has a volume and less weight than hydroforming devices loading in press, their size nevertheless remains too important.
Afin de remédier à cet inconvénient, on à déjà imaginé des dispositifs pour le formage d'un corps creux métallique ou analogue par l'introduction à l'intérieur dudit corps creux d'un fluide sous haute pression suivant un procédé dit « d'hydroformage » comprenant un bâti constitué d'une pièce creuse ouverte apte à accueillir l'outillage, ledit outillage étant introduit dans le bâti par translation le long de l'axe de révolution dudit bâti. C'est le cas, par exemple, du brevet américain US 6 305 204 décrivant un dispositif d'hydroformage de pièces tubulaires. Ce dispositif comprend une source de fluide sous pression, un bâti cylindrique comprenant un évidement central cylindrique, une pièce tubulaire à former et un outillage comprenant une ou plusieurs parties dans lequel est apte à être introduit un mandrin globalement cylindrique. Ledit mandrin est apte à être positionné à l'intérieur de la pièce tubulaire à former elle-même placée à l'intérieur de l'outillage qui présente un évidement central globalement cylindrique lorsque les différentes pièces de l'outillage sont assemblées. La source de fluide. sous pression est connectée au mandrin placé à l'intérieur de la pièce tubulaire à former.In order to remedy this drawback, we have already imagined devices for forming a hollow body metallic or the like by introduction inside said hollow body of a fluid under high pressure according to a process called "hydroforming" comprising a frame consisting of an open hollow part able to accommodate the tool, said tool being introduced into the frame by translation along the axis of revolution of said frame. This is the case, for example, of US patent US 6,305,204 describing a hydroforming device for parts tubular. This device includes a source of fluid under pressure, a cylindrical frame comprising a recess cylindrical central, a tubular part to be formed and a tool comprising one or more parts in which is able to be inserted globally cylindrical. Said mandrel is suitable for being positioned at the inside of the tubular part to be formed, placed itself inside the tool which has a recess globally cylindrical central when the different tool parts are assembled. The source of fluid. under pressure is connected to the mandrel placed inside of the tubular part to be formed.
Ce type de dispositif présente l'inconvénient de ne pas permettre le formage de pièces de formes complexes, les pièces devant être aptes à accueillir le mandrin.This type of device has the disadvantage of not not allow the forming of parts of complex shapes, parts to be able to accommodate the mandrel.
L'un des buts de l'invention est donc de remédier à tous ces inconvénients en proposant un dispositif d'hydroformage de conception simple et peu onéreuse permettant d'optimiser les outillages et de réduire l'encombrement de ces dispositifs.One of the aims of the invention is therefore to remedy all these disadvantages by proposing a device hydroforming of simple and inexpensive design to optimize the tools and reduce the size of these devices.
A cet effet et conformément à l'invention, il est proposé un dispositif pour le formage d'un corps creux métallique ou analogue par l'introduction à l'intérieur dudit corps creux d'un fluide sous haute pression suivant un procédé dit d'hydroformage, ledit dispositif comportant d'une part, au moins un outillage constitué d'au moins deux parties respectivement munies d'une dépouille et aptes à accueillir le corps creux métallique à former, et d'autre part un bâti constitué d'une pièce creuse ouverte à au moins l'une de ses extrémités et apte à accueillir l'outillage, ledit outillage étant introduit dans le bâti par translation le long de l'axe dudit bâti ; ce dispositif est remarquable en ce qu'il comprend des moyens de préformage du corps creux lors du mouvement de fermeture des parties de l'outillage.To this end and in accordance with the invention, it is proposed a device for forming a hollow body metallic or the like by introduction inside said hollow body of a fluid under high pressure according to a process known as hydroforming, said device comprising on the one hand, at least one tool consisting of at least two parts respectively provided with a draft and suitable for accommodate the metal hollow body to be formed, and other share a frame consisting of a hollow part open to at minus one of its ends and able to accommodate the tool, said tool being introduced into the frame by translation along the axis of said frame; these measures is remarkable in that it includes means of preforming of the hollow body during the closing movement parts of the tooling.
On comprend bien que contrairement aux dispositifs d'hydroformage de l'art antérieur où les contraintes induites par la pression d'hydroformage étaient reprises par deux plateaux parallèles maintenus en position par une presse hydraulique, les contraintes induites par la pression d'hydroformage sont uniformément réparties sur la paroi intérieure du bâti, lesdites contraintes étant radiales à l'axe de révolution dudit bâti, ce qui permet de réduire considérablement les dimensions d'un tel bâti. De plus, il n'est plus nécessaire de préformer la pièce dans des machines-outils spécifiques préalablement à l'hydroformage.We understand that unlike the devices hydroforming of the prior art where the constraints induced by hydroforming pressure were taken up by two parallel plates held in position by a hydraulic press, the stresses induced by the hydroforming pressures are evenly distributed over the inner wall of the frame, said constraints being radial to the axis of revolution of said frame, which allows considerably reduce the dimensions of such a frame. Of more, it is no longer necessary to preform the part in specific machine tools prior to hydroforming.
De manière particulièrement avantageuse, la pièce creuse de révolution formant le bâti est ouverte à ses deux extrémités afin de permettre l'introduction alternativement de deux outillages, identiques ou non, d'un côté puis de l'autre dudit bâti.Particularly advantageously, the piece hollow of revolution forming the frame is open to both ends to allow introduction alternately two tools, identical or not, on one side and then the other of said frame.
D'autres avantages et caractéristiques ressortiront mieux de la description qui va suivre de plusieurs variantes d'exécution données à titre d'exemples non limitatifs du dispositif pour le formage d'un corps creux métallique conforme à l'invention en référence aux dessins annexés sur lesquels :
- la figure 1 est une représentation schématique en coupe longitudinale du dispositif d'hydroformage conforme à l'invention,
- la figure 2 est une représentation schématique en coupe transversale du dispositif d'hydroformage suivant l'invention représenté sur la figure 1,
- la figure 3 est une représentation schématique en coupe longitudinale d'une variante d'exécution du dispositif d'hydroformage suivant l'invention.
- la figure 4 est une représentation schématique en perspective d'une variante d'exécution du dispositif d'hydroformage selon l'invention.
- FIG. 1 is a schematic representation in longitudinal section of the hydroforming device according to the invention,
- FIG. 2 is a diagrammatic representation in cross section of the hydroforming device according to the invention shown in FIG. 1,
- Figure 3 is a schematic representation in longitudinal section of an alternative embodiment of the hydroforming device according to the invention.
- Figure 4 is a schematic perspective representation of an alternative embodiment of the hydroforming device according to the invention.
En référence à la figure 1, le dispositif pour le
formage d'un corps creux métallique ou analogue conforme à
l'invention comprend un bâti 1 consistant dans une pièce
cylindrique comportant un évidement central cylindrique
concentrique 2 apte à accueillir un outillage 3 constitué
de deux parties de moule hémicylindriques 3a,3b. Chaque
partie hémicylindrique 3a,3b comprend une dépouille 4a,4b
apte à accueillir un corps creux métallique cylindrique 5,
par exemple, la forme des dépouilles 4a, 4b correspondant à
la forme de la pièce que l'on souhaite obtenir, lorsque les
deux parties 3a, 3b de l'outillage 3 sont assemblées, comme
l'indique les flèches a de la figure 1. Après avoir
positionné le corps creux métallique 5 dans les
dépouilles 4a, 4b des parties 3a, 3b de l'outillage 3 que
l'on a joint, au moyen, par exemple de vérins non
représentés sur les figures, l'outillage 3 qui présente
alors une forme cylindrique est introduit dans l'évidement
central cylindrique 2 du bâti 1 par translation le long de
l'axe de révolution A, représenté en traits pointillés sur
la figure 1, dudit bâti 1. L'outillage 3 comprend, par
ailleurs, un canal d'entrée 6 s'étendant depuis une
première extrémité dudit outillage 3 et débouchant dans le
volume délimité par les dépouilles 4a, 4b dudit outillage 3
et un canal de sortie 7 s'étendant depuis l'extrémité
opposée dudit outillage 3 et débouchant dans ledit volume
délimité par les dépouilles 4a, 4b de l'outillage 3. Un
fluide sous pression dit fluide d'hydroformage est
introduit par le canal d'entrée 6 à l'intérieur du corps
creux 5 positionné dans l'outillage 3, le canal de sortie 7
étant obturé par des moyens de fermeture, non représentés
sur la figure. Des moyens d'alimentation 8 fournissent le
fluide d'hydroformage à une pression d'hydroformage P1
pouvant atteindre 6000 bars.With reference to FIG. 1, the device for forming a metallic hollow body or the like according to the invention comprises a
Après le formage du corps creux métallique 5, le
canal de sortie 7 est ouvert pour permettre l'échappement
du fluide d'hydroformage introduit dans l'outillage 3,
comme l'indique la flèche c. After the metal
De manière particulièrement avantageuse, en référence
à la figure 1, lors du mouvement de fermeture des
parties 3a, 3b de l'outillage 3, comme l'indique les
flèches a, ledit mouvement de fermeture de l'outillage 3
peut être accompagné de diverses fonctions de préformage du
corps creux métallique 5 avec ou sans fluide sous pression,
tel que, par exemple, un emboutissage, un allongement du
corps creux, etc ...Particularly advantageously, with reference to FIG. 1, during the closing movement of the
Selon une première variante d'exécution
particulièrement avantageuse, l'outillage 3 comprend plus
de deux parties formant ainsi plusieurs plans de joints, au
moins deux plans de joints distincts, qui permettent de
réaliser l'hydroformage de pièces de formes complexes. On
notera qu'un outillage 3 comprenant n parties, n étant un
nombre entier de préférence supérieur à deux, présente n-1
plans de joint. De plus, on observera que les dispositifs
de l'art antérieur comprenant une presse hydraulique
présentent un seul plan de joint qui empêche, le démoulage
de la pièce hydroformée ne pouvant s'effectuer que suivant
un seul plan, la réalisation de pièces de formes complexes.
Afin de palier cet inconvénient, les dispositifs de l'art
antérieur peuvent bien évidemment comprendre des tiroirs
escamotables logés dans l'outillage, ce qui grève
considérablement les coûts de fabrication de ces
outillages. According to a first variant of execution
particularly advantageous, the
Par ailleurs, les différentes parties de
l'outillage 3 suivant l'invention comprennent
avantageusement des moyens internes tels que des verrous
afin de joindre deux parties de l'outillage 3 adjacentes,
des poinçons ou similaires, pilotés par des moyens de
commande extérieurs pour la réalisation de formes
particulières.Furthermore, the different parts of
the
Selon une caractéristique particulièrement
avantageuse du dispositif conforme à l'invention, en
référence à la figure 1, les parties 3a, 3b de l'outillage 3
comprennent des moyens de compensation hydrostatique
consistant dans un creux 9a et respectivement 9b pratiqués
sur la surface extérieure des parties 3a et
respectivement 3b de l'outillage 3, lesdits creux 9a, 9b
formant avec la paroi intérieure du bâti 1 une
chambre 10a, 10b alimentée en fluide sous pression, à une
pression P2 et respectivement P3, les pressions P2 et P3
étant identiques ou non, par un canal 11a et
respectivement 11b pratiqué dans ledit bâti 1. Les
chambres 10a, 10b sont alimentées en fluide sous pression
par des moyens d'alimentation 12a et respectivement 12b qui
sont indépendants des moyens d'alimentation en fluide sous
pression introduits à l'intérieur du corps creux 5
positionné dans l'outillage 3.According to a particularly advantageous characteristic of the device according to the invention, with reference to FIG. 1, the
Il est bien évident que les moyens d'alimentation en
fluide sous pression des moyens de compensation
hydrostatiques peuvent assurer l'alimentation en fluide
sous pression introduit à l'intérieur du corps creux 5
positionné dans l'outillage 3.It is quite obvious that the means of supplying
fluid under pressure compensation means
hydrostatic can supply fluid
under pressure introduced inside the
Par ailleurs, les canaux d'alimentation 11a, 11b, des
chambres des moyens de compensation hydrostatiques 10a, 10b
peuvent être pratiqués dans les parties 3a et 3b de
l'outillage 3 sans pour autant sortir du cadre de
l'invention.Furthermore, the
Chaque chambre 10a, 10b des moyens de compensation
hydrostatiques comprend avantageusement un revêtement
consistant dans une membrane 13a et respectivement 13b en
matériau synthétique hermétique remplissant ladite
chambre 10a ou 10b de manière analogue à un ballon afin
d'assurer l'étanchéité de ladite chambre 10a, 10b.Each
Il est bien évident que seule l'une des parties 3a, 3b
de l'outillage 3 peut comprendre des moyens de compensation
hydrostatiques sans sortir du cadre de l'invention.It is obvious that only one of the
Selon une variante d'exécution du dispositif conforme
à l'invention, en référence à la figure 2, l'outillage 3
comprend trois parties 3a, 3b, 3c consistant respectivement
dans une section de cylindre respectivement munie d'une
dépouille 4a, 4b, 4c apte à accueillir le corps creux
métallique 5 à former, le bâti 1 présentant de la même
manière que précédemment une forme cylindrique comportant
un évidement central 2 également cylindrique. On observera
ainsi que l'évidement central 2 du bâti 1 qui présente une
section circulaire procure une parfaite répartition des
pressions hydrostatiques représentées par les flèches d, la
pression hydrostatique qui s'applique sur la paroi
intérieure du bâti 1 étant radiale, lors de l'hydroformage
du corps creux 5.According to an alternative embodiment of the device according to the invention, with reference to Figure 2, the
Il est bien évident que le bâti 1 peut consister dans
une pièce creuse de révolution de section quelconque
comportant un évidement central de section également
quelconque, telle que, par exemple, ovoïde, rectangulaire,
etc ...; l'outillage présentant alors une section identique à
la section de l'évidement central 2 du bâti 1, sans pour
autant sortir du cadre de l'invention.It is obvious that the
Par ailleurs, selon une autre variante d'exécution du
dispositif conforme à l'invention, en référence à la
figure 3, le bâti 1 consiste dans une pièce cylindrique
comportant un évidement central de forme tronconique,
l'outillage 3 présentant alors une forme également
tronconique.Furthermore, according to another alternative embodiment of the
device according to the invention, with reference to the
Figure 3, the
Selon une dernière variante d'exécution du dispositif
suivant l'invention, en référence à la figure 4, ce dernier
est constitué d'un bâti 1 de forme globalement
parallélépipédique comportant un évidement central 2
tronconique de section en forme d'hexagone régulier, c'est-à-dire
un évidement central 2 de section en forme
d'hexagone régulier dont la section se rétrécie depuis son
extrémité supérieure jusqu'à son fond, ledit évidement
central 2 étant orienté vers le haut. L'évidement central 2
du bâti 1 est apte à recevoir un outillage 3 constitué de
deux parties 3a et 3b respectivement munies d'une dépouille
4a, 4b dans laquelle est positionné le corps creux
métallique 5 à former. Le dispositif comprend, par
ailleurs, une structure tubulaire 14 constituée de
montants 15 de traverses 16 et de longerons 17 s'étendant
au dessus du bâti 1 et portant des tuyaux 18 d'alimentation
en fluide sous pression connectés à un générateur de fluide
sous pression 19 piloté par un tableau de commande 20.
L'outillage 3 est introduit par translation verticale dans
l'évidement central 2 du bâti 1 en déplaçant vers le haut
le bâti 1 le long des montants 15 de la structure 14 au
moyen de vérins hydrauliques par exemple, non représentés
sur la figure 4. Les dépouilles 4a, 4b de l'outillage 3
peuvent comprendre des moyens d'emboutissage, tels qu'une
contre-dépouille par exemple, qui emboutit le corps creux 5
lors de l'introduction de l'outillage 3 dans l'évidement 2
du bâti. Afin d'éviter toute détérioration dudit corps
creux 5 lors de son pré-formage par emboutissage, de l'eau
sous pression est introduite dans le corps creux 5 au cours
dudit pré-formage, la pression de l'eau étant de préférence
légèrement inférieure à la pression exercée par la contre
dépouille sur le corps creux 5.According to a last alternative embodiment of the device according to the invention, with reference to FIG. 4, the latter consists of a
Il va de soi que l'outillage 3 peut être introduit
dans l'évidement central 2 du bâti 1 fixe par une
translation verticale dudit outillage 3 au moyen de vérins
hydrauliques sans pour autant sortir du cadre de
l'invention.It goes without saying that
Par ailleurs, il va de soi que l'évidement central 2
du bâti 1 peut présenter une section de polygone régulier
ou irrégulier.Furthermore, it goes without saying that the
Il est bien évident que le bâti 1, l'évidement
central 2, l'outillage 3 comprennent des moyens
d'étanchéité non représentés sur les figures ainsi que des
capteurs positionnés notamment dans les dépouilles 4a, 4b de
l'outillage 3 afin de mesurer les pressions, sans sortir du
cadre de l'invention.It is obvious that the
Enfin, il est bien évident que les exemples que l'on vient de donner ne sont que des illustrations particulières, en aucun cas limitatives quant aux domaines d'application de l'invention.Finally, it is quite obvious that the examples that we just gave are just illustrations particular, in no way limiting as to the areas of application of the invention.
Claims (13)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0301111A FR2850593B1 (en) | 2003-01-31 | 2003-01-31 | DEVICE FOR HYDROFORMING A HOLLOW BODY |
FR0301111 | 2003-01-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1442806A1 true EP1442806A1 (en) | 2004-08-04 |
EP1442806B1 EP1442806B1 (en) | 2008-03-26 |
Family
ID=32605976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04290264A Expired - Lifetime EP1442806B1 (en) | 2003-01-31 | 2004-02-02 | Apparatus for hydroforming a hollow body |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1442806B1 (en) |
AT (1) | ATE390223T1 (en) |
DE (1) | DE602004012630T2 (en) |
ES (1) | ES2305674T3 (en) |
FR (1) | FR2850593B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111601670A (en) * | 2018-03-15 | 2020-08-28 | 宝马股份公司 | Mold for molding and method for manufacturing component |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1526444A (en) * | 1966-06-03 | 1968-05-24 | Tokyu Car Corp | Hydraulic Pressure Shock Stamping Tool |
US3685327A (en) * | 1969-11-12 | 1972-08-22 | Masanobu Nakamura | Bulging apparatus |
US5170557A (en) * | 1991-05-01 | 1992-12-15 | Benteler Industries, Inc. | Method of forming a double wall, air gap exhaust duct component |
EP0686440A1 (en) * | 1994-05-12 | 1995-12-13 | Benteler Industries, Inc. | Hydroforming apparatus |
DE19810196A1 (en) * | 1998-03-10 | 1999-09-16 | Schade Gmbh & Co Kg | Bending, calibrating and fine shaping process for beads, resting surfaces and/or conical areas of hollow strips |
DE19839526C1 (en) * | 1998-08-29 | 1999-11-18 | Daimler Chrysler Ag | Method of pressing metal component from sheet blank |
US5987950A (en) * | 1997-07-18 | 1999-11-23 | Cosma International Inc. | Hydroforming of a tubular blank having an oval cross section |
US6134931A (en) * | 1999-05-26 | 2000-10-24 | Husky Injection Molding Systems Ltd. | Process and apparatus for forming a shaped article |
US6305204B1 (en) * | 2000-07-13 | 2001-10-23 | The Boeing Company | Bulge forming machine |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19705244A1 (en) * | 1997-02-12 | 1998-08-13 | Huber & Bauer Gmbh | Forming device |
-
2003
- 2003-01-31 FR FR0301111A patent/FR2850593B1/en not_active Expired - Fee Related
-
2004
- 2004-02-02 DE DE602004012630T patent/DE602004012630T2/en not_active Expired - Lifetime
- 2004-02-02 AT AT04290264T patent/ATE390223T1/en not_active IP Right Cessation
- 2004-02-02 EP EP04290264A patent/EP1442806B1/en not_active Expired - Lifetime
- 2004-02-02 ES ES04290264T patent/ES2305674T3/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1526444A (en) * | 1966-06-03 | 1968-05-24 | Tokyu Car Corp | Hydraulic Pressure Shock Stamping Tool |
US3685327A (en) * | 1969-11-12 | 1972-08-22 | Masanobu Nakamura | Bulging apparatus |
US5170557A (en) * | 1991-05-01 | 1992-12-15 | Benteler Industries, Inc. | Method of forming a double wall, air gap exhaust duct component |
EP0686440A1 (en) * | 1994-05-12 | 1995-12-13 | Benteler Industries, Inc. | Hydroforming apparatus |
US5987950A (en) * | 1997-07-18 | 1999-11-23 | Cosma International Inc. | Hydroforming of a tubular blank having an oval cross section |
DE19810196A1 (en) * | 1998-03-10 | 1999-09-16 | Schade Gmbh & Co Kg | Bending, calibrating and fine shaping process for beads, resting surfaces and/or conical areas of hollow strips |
DE19839526C1 (en) * | 1998-08-29 | 1999-11-18 | Daimler Chrysler Ag | Method of pressing metal component from sheet blank |
US6134931A (en) * | 1999-05-26 | 2000-10-24 | Husky Injection Molding Systems Ltd. | Process and apparatus for forming a shaped article |
US6305204B1 (en) * | 2000-07-13 | 2001-10-23 | The Boeing Company | Bulge forming machine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111601670A (en) * | 2018-03-15 | 2020-08-28 | 宝马股份公司 | Mold for molding and method for manufacturing component |
US11666959B2 (en) | 2018-03-15 | 2023-06-06 | Bayerische Motoren Werke Aktiengesellschaft | Forming tool and method for producing a component |
Also Published As
Publication number | Publication date |
---|---|
FR2850593B1 (en) | 2006-09-08 |
EP1442806B1 (en) | 2008-03-26 |
DE602004012630T2 (en) | 2009-04-30 |
ES2305674T3 (en) | 2008-11-01 |
FR2850593A1 (en) | 2004-08-06 |
ATE390223T1 (en) | 2008-04-15 |
DE602004012630D1 (en) | 2008-05-08 |
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