EP2448691A1 - Machine for stamping curved blanks - Google Patents
Machine for stamping curved blanksInfo
- Publication number
- EP2448691A1 EP2448691A1 EP10734503A EP10734503A EP2448691A1 EP 2448691 A1 EP2448691 A1 EP 2448691A1 EP 10734503 A EP10734503 A EP 10734503A EP 10734503 A EP10734503 A EP 10734503A EP 2448691 A1 EP2448691 A1 EP 2448691A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blank
- machine
- stamping
- bezel
- 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- Withdrawn
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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/04—Blank holders; Mounting means therefor
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
Definitions
- the present invention relates to the field of stamping metal parts or plastic.
- embossing consists of deforming a plate, also called blank (sheet metal in the case of a metallic material) by means of a stamping machine, comprising a female tool, generally called a matrix, and a male tool, usually called punch.
- a blank holder Before penetrating the punch into the die, it is necessary to immobilize the plate by means of a blank holder, as is known for example from FR2200067: such a blank holder prevents the formation of folds or breaks in the blank to be stamped.
- the correct positioning of the blank with respect to the blank is generally done by means of dredgers, which are in fact some sort of lateral guides allowing a correct centering of the blank with respect to the blank holder.
- dredgers which are in fact some sort of lateral guides allowing a correct centering of the blank with respect to the blank holder.
- the present invention is intended to solve this problem.
- This object of the invention is achieved with a machine for stamping a blank, comprising a die, a punch, a blank holder having a curved surface and bezers capable of centering a blank to be stamped with respect to said blank holder, which is remarkable for at least one of said bezels has a profile corresponding substantially to the path followed by the edge of the blank cooperating with the bezel when the blank comes to marry said surface under the effect of its own weight.
- this particular profile of the bezel it can maintain the edge of the blank closer to the bezel when the blank deforms under the effect of its weight on the curved surface of the blank holder, and thus prevent the appearance of a game between this bezel and this blank: one can in this way limit the uncontrolled movements of the blank, and improve the repeatability of the centering of the blank in the stamping machine.
- said bezel has a substantially circular profile
- said machine comprises a plurality of bezels, each bezel having a profile substantially corresponding to the path followed by an edge of said blank: this makes it possible to ensure optimal immobilization of the blank; said machine is adapted to stamp said blank by thermoforming: this embodiment is suitable for stamping plastic blanks.
- stamping blank 1 arriving on a stamping machine 3.
- the blank 1 is in fact a metal plate or plastic, which it is desired to conform in a particular way, for example for the purpose of using it as an element of the bodywork of a motor vehicle.
- the stamping machine 3 comprises a female tool, generally called a matrix, symbolized by the arrow 7 of the figure, and a male tool generally called a punch, symbolized by the arrow 5 in the figure.
- the blank 1 Prior to the stamping operation itself, the blank 1 is deposited on a blank holder.
- This blank holder makes it possible to immobilize the blank during the stamping operation, and thus to prevent the formation of folds or breaks.
- the blank it is desirable to give the blank a curved shape, and thus uses a blank holder whose surface 9 has the desired shape.
- each bezel 13 has a rectilinear profile extending substantially along the vertical axis Z, as indicated by the dotted line 15.
- the bezel 13 loses its ability to correctly center the blank 1 with respect to the stamping machine 3, and more particularly with respect to the blank holder.
- the improper centering of the blank 1 relative to the stamping machine has many drawbacks, among which repeatability problems generating geometrical dispersions and appearance defects on skin pieces during the stamping phase.
- the present invention proposes to give the bezel 13 a profile substantially corresponding to the path that follows the edge 17 of the blank 1 when it moves from its flat position (shown in dashed lines in the figure) to its curved position (shown in solid lines in the figure).
- this particular profile of the bezel 13, represented by the solid line 19 in the appended figure, is substantially tangent to the path followed by the edge 17 of the blank 1 between the two aforementioned positions.
- the edge 17 remains substantially in contact with the profile 19 of the bezel 13, which prevents any movement of the blank by relative to this bezel: in this way, the problems of geometrical dispersion of the stamping are overcome, and it is thus possible to guarantee excellent repeatability of the latter.
- thermoforming thermoforming
Abstract
The invention relates to a machine (3) for stamping a blank (1), including a die (7), a punch (5), a blank holder having a curved surface (9), and nests (13) for centering a blank (1) to be stamped relative to said blank holder. The machine is characterized in that at least one of said nests (13) has a profile (19) substantially corresponding to the path followed by the edge (17) of the blank (1) engaging with said nest (13) when said blank (1) tightly bears on said surface (9) by means of its own weight.
Description
MACHINE A EMBOUTIR LES FLANS GALBES MACHINE TO FIT THE GALBAN FLANKS
La présente invention se rapporte au domaine de l'emboutissage de pièces métalliques ou en matière plastique. The present invention relates to the field of stamping metal parts or plastic.
Comme cela est connu en soi, l'emboutissage consiste à déformer une plaque, appelée aussi flan (tôle dans le cas d'un matériau métallique) au moyen d'une machine à emboutir, comprenant un outil femelle, généralement appelé matrice, et un outil mâle, généralement appelé poinçon. As is known per se, embossing consists of deforming a plate, also called blank (sheet metal in the case of a metallic material) by means of a stamping machine, comprising a female tool, generally called a matrix, and a male tool, usually called punch.
La déformation d'un flan par emboutissage permet notamment d'obtenir des pièces creuses à cadences élevées. Une telle technique trouve des applications dans de nombreux domaines techniques, et en particulier dans le domaine de la fabrication d'éléments de carrosserie pour véhicules automobiles. The deformation of a blank by stamping allows in particular to obtain hollow parts at high rates. Such a technique has applications in many technical fields, and in particular in the field of the manufacture of body parts for motor vehicles.
Avant de faire pénétrer le poinçon dans la matrice, il est nécessaire d'immobiliser la plaque au moyen d'un serre-flan, comme cela est connu par exemple de FR2200067 : un tel serre-flan permet de prévenir la formation de plis ou de cassures dans le flan à emboutir. Before penetrating the punch into the die, it is necessary to immobilize the plate by means of a blank holder, as is known for example from FR2200067: such a blank holder prevents the formation of folds or breaks in the blank to be stamped.
Le positionnement correct du flan par rapport au serre-flan s'effectue en général au moyen de drageoirs, qui sont en fait des sortes de guides latéraux permettant un centrage correct du flan par rapport au serre-flan. Lorsque l'on souhaite que la pièce sortant de la machine à emboutir présente un galbe, une manière de faire est de poser le flan sur un serre-flan lui-même galbé, le flan prenant alors au moins une partie de son galbe par gravité, c'est-à-dire sous l'effet de son propre poids. Lors de cette prise de galbe, il apparaît classiquement un jeu entre les bords du flan et les drageoirs, ces derniers étant en effet dimensionnés pour correspondre aux dimensions du flan avant prise de galbe, c'est à dire lorsqu'il se trouve à plat.
Ce jeu est gênant car il pose des problèmes de répétabilité du centrage du flan dans la machine à emboutir. The correct positioning of the blank with respect to the blank is generally done by means of dredgers, which are in fact some sort of lateral guides allowing a correct centering of the blank with respect to the blank holder. When it is desired that the piece coming out of the stamping machine has a curve, one way to do is to place the blank on a blank holder itself curved, the blank then taking at least part of its curve by gravity that is to say, under the effect of its own weight. During this taking of the curve, it appears classically a game between the edges of the blank and the bezels, the latter being in fact sized to correspond to the dimensions of the blank before taking shape, ie when it is flat . This game is troublesome because it poses problems of repeatability of the centering of the blank in the stamping machine.
La présente invention a notamment pour but de résoudre ce problème. The present invention is intended to solve this problem.
On atteint ce but de l'invention avec une machine à emboutir un flan, comprenant une matrice, un poinçon, un serre-flan comportant une surface galbée et des drageoirs aptes à centrer un flan à emboutir par rapport audit serre-flan, remarquable en ce qu'au moins l'un desdits drageoirs présente un profil correspondant sensiblement à la trajectoire suivie par le bord du flan coopérant avec ce drageoir lorsque ce flan vient épouser ladite surface sous l'effet de son propre poids. This object of the invention is achieved with a machine for stamping a blank, comprising a die, a punch, a blank holder having a curved surface and bezers capable of centering a blank to be stamped with respect to said blank holder, which is remarkable for at least one of said bezels has a profile corresponding substantially to the path followed by the edge of the blank cooperating with the bezel when the blank comes to marry said surface under the effect of its own weight.
Grâce à ce profil particulier du drageoir, on peut maintenir le bord du flan au plus près de ce drageoir lorsque ce flan se déforme sous l'effet de son poids sur la surface galbée du serre-flan, et éviter ainsi l'apparition d'un jeu entre ce drageoir et ce flan : on peut de la sorte limiter les déplacements non contrôlés du flan, et améliorer la répétabilité du centrage du flan dans la machine à emboutir. Thanks to this particular profile of the bezel, it can maintain the edge of the blank closer to the bezel when the blank deforms under the effect of its weight on the curved surface of the blank holder, and thus prevent the appearance of a game between this bezel and this blank: one can in this way limit the uncontrolled movements of the blank, and improve the repeatability of the centering of the blank in the stamping machine.
Suivant d'autres caractéristiques optionnelles de la machine selon l'invention : According to other optional features of the machine according to the invention:
- ledit drageoir présente un profil sensiblement circulaire ; said bezel has a substantially circular profile;
- ladite machine comprend une pluralité de drageoirs, chaque drageoir présentant un profil correspondant sensiblement à la trajectoire suivie par un bord dudit flan : ceci permet d'assurer une immobilisation optimale du flan ; - ladite machine est adaptée pour emboutir ledit flan par thermoformage : ce mode de réalisation convient pour l'emboutissage de flans en matière plastique. said machine comprises a plurality of bezels, each bezel having a profile substantially corresponding to the path followed by an edge of said blank: this makes it possible to ensure optimal immobilization of the blank; said machine is adapted to stamp said blank by thermoforming: this embodiment is suitable for stamping plastic blanks.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lumière de la description qui va suivre, et à l'examen de l'unique figure ci-annexée, représentant de manière schématique une machine selon l'invention sur laquelle se trouve un flan à emboutir.
Sur cette figure, des références identiques désignent des organes ou ensembles d'organes identiques ou analogues, ou bien un même organe se trouvant dans plusieurs positions différentes. On a représenté sur la figure unique ci-jointe, un flan à emboutir 1 arrivant sur une machine à emboutir 3. Le flan 1 est en fait une plaque métallique ou en matière plastique, que l'on souhaite conformer d'une manière particulière, par exemple dans le but de l'utiliser comme un élément de la carrosserie d'un véhicule automobile. Comme cela est connu en soi, la machine à emboutir 3 comporte un outil femelle, généralement appelé matrice, symbolisé par la flèche 7 de la figure, ainsi qu'un outil mâle généralement appelé poinçon, symbolisé par la flèche 5 de la figure. Other features and advantages of the present invention will become apparent in the light of the following description, and on examining the single figure attached, schematically representing a machine according to the invention on which there is a stamping flan. In this figure, identical references designate members or sets of identical or similar members, or the same member being in several different positions. There is shown in the single figure attached, a stamping blank 1 arriving on a stamping machine 3. The blank 1 is in fact a metal plate or plastic, which it is desired to conform in a particular way, for example for the purpose of using it as an element of the bodywork of a motor vehicle. As is known per se, the stamping machine 3 comprises a female tool, generally called a matrix, symbolized by the arrow 7 of the figure, and a male tool generally called a punch, symbolized by the arrow 5 in the figure.
Ces deux outils de formes complémentaires se déplacent l'un vers l'autre selon la direction des flèches 5 et 7, de manière à conférer au flan 1 une forme particulière souhaitée, telle qu'une forme localement creuse. These two tools of complementary shapes move towards each other in the direction of the arrows 5 and 7, so as to give the blank 1 a particular desired shape, such as a locally hollow shape.
Préalablement à l'opération d'emboutissage à proprement parler, le flan 1 est déposé sur un serre-flan. Prior to the stamping operation itself, the blank 1 is deposited on a blank holder.
Ce serre-flan permet d'immobiliser le flan pendant l'opération d'emboutissage, et de prévenir ainsi la formation de plis ou cassures. This blank holder makes it possible to immobilize the blank during the stamping operation, and thus to prevent the formation of folds or breaks.
Dans certains cas, il est souhaitable de conférer au flan une forme galbée, et l'on utilise ainsi un serre-flan dont la surface 9 présente le galbe souhaité. In some cases, it is desirable to give the blank a curved shape, and thus uses a blank holder whose surface 9 has the desired shape.
Dans ce cas particulier, le flan 1 arrive sur la machine à emboutir 3 sensiblement à plat, comme cela est indiqué par la représentation en pointillés de ce flan, puis sous l'effet de son propre poids, il vient reposer sur la surface 9 du serre-flan, ce qui lui confère le galbe souhaité juste avant l'opération d'emboutissage à proprement parler.
Classiquement, on dispose sur les côtés de la machine à emboutir une pluralité de drageoirs 13, qui sont des sortes de butée fixées sur le bâti 1 1 de la machine, et qui permettent de guider et de centrer correctement le flan 1 par rapport à la machine 3. Habituellement, chaque drageoir 13 présente un profil rectiligne s'étendant sensiblement selon l'axe vertical Z, comme cela est indiqué par la ligne en pointillés 15. In this particular case, the blank 1 arrives on the stamping machine 3 substantially flat, as indicated by the dashed representation of this blank, then under the effect of its own weight, it comes to rest on the surface 9 of the blank. blank holder, which gives it the desired shape just before the actual stamping operation. Conventionally, there are disposed on the sides of the stamping machine a plurality of bevels 13, which are kinds of stop fixed on the frame 1 1 of the machine, and which guide and center correctly the blank 1 relative to the machine 3. Usually, each bezel 13 has a rectilinear profile extending substantially along the vertical axis Z, as indicated by the dotted line 15.
Avec un tel profil rectiligne de drageoir, lorsque le flan 1 se galbe sous l'effet de son poids pour épouser la surface 9 du serre-flan, il apparaît un jeu important J entre le bord 17 du flan et le drageoir 13. With such a rectilinear profile of bezel, when the blank 1 is curved under the effect of its weight to marry the surface 9 of the blank holder, there appears an important clearance J between the edge 17 of the blank and the bezel 13.
Du fait de ce jeu, le drageoir 13 perd sa capacité à centrer correctement le flan 1 par rapport à la machine à emboutir 3, et plus particulièrement par rapport au serre-flan. Because of this game, the bezel 13 loses its ability to correctly center the blank 1 with respect to the stamping machine 3, and more particularly with respect to the blank holder.
Ceci est d'autant plus vrai si le problème d'apparition du jeu J susmentionné apparaît pour plusieurs drageoirs disposés à la périphérie du flan 1. This is all the more true if the problem of appearance of the game J mentioned above appears for several bezels arranged on the periphery of the blank 1.
Le mauvais centrage du flan 1 par rapport à la machine à emboutir présente de nombreux inconvénients, parmi lesquels des problèmes de répétabilité engendrant des dispersions géométrique et des défauts d'aspect sur pièces de peau durant la phase d'emboutissage. The improper centering of the blank 1 relative to the stamping machine has many drawbacks, among which repeatability problems generating geometrical dispersions and appearance defects on skin pieces during the stamping phase.
Pour remédier aux inconvénients ci-dessus exposés, la présente invention propose de conférer au drageoir 13 un profil correspondant sensiblement à la trajectoire que suit le bord 17 du flan 1 lorsqu'il passe de sa position à plat (représentée en pointillés sur la figure) à sa position galbée (représentée en traits continus sur la figure). To overcome the disadvantages described above, the present invention proposes to give the bezel 13 a profile substantially corresponding to the path that follows the edge 17 of the blank 1 when it moves from its flat position (shown in dashed lines in the figure) to its curved position (shown in solid lines in the figure).
En d'autres termes, ce profil particulier du drageoir 13, représenté par le trait continu 19 sur la figure ci-annexée, est sensiblement tangent à la trajectoire que suit le bord 17 du flan 1 entre les deux positions susmentionnées.
De la sorte, lorsque le flan 1 repose sous l'effet de son propre poids sur la surface galbée 9 du serre-flan, son bord 17 reste pratiquement en contact avec le profil 19 du drageoir 13, ce qui évite tout mouvement du flan par rapport à ce drageoir : on s'affranchit de la sorte des problèmes de dispersion géométrique de l'emboutissage, et on peut ainsi garantir une excellente répétabilité de ce dernier. In other words, this particular profile of the bezel 13, represented by the solid line 19 in the appended figure, is substantially tangent to the path followed by the edge 17 of the blank 1 between the two aforementioned positions. In this way, when the blank 1 rests under the effect of its own weight on the curved surface 9 of the blank holder, its edge 17 remains substantially in contact with the profile 19 of the bezel 13, which prevents any movement of the blank by relative to this bezel: in this way, the problems of geometrical dispersion of the stamping are overcome, and it is thus possible to guarantee excellent repeatability of the latter.
Bien entendu, la présente invention n'est nullement limitée au mode de réalisation décrit ci-dessus. C'est ainsi par exemple que l'on peut envisager d'utiliser l'enseignement de l'invention pour le cas particulier des machines à emboutir les matières plastiques à chaud, selon le procédé couramment connu sous le nom de thermoformage.
Of course, the present invention is not limited to the embodiment described above. For example, it is possible to envisage using the teaching of the invention for the particular case of hot stamping machines, according to the method commonly known as thermoforming.
Claims
1. Machine (3) à emboutir un flan (1 ), comprenant une matrice (7), un poinçon (5), un serre-flan comportant une surface galbée (9) et des drageoirs (13) aptes à centrer un flan (1 ) à emboutir par rapport audit serre-flan, caractérisée en ce qu'au moins l'un desdits drageoirs (13) présente un profil (19) correspondant sensiblement à la trajectoire suivie par le bord (17) du flan (1 ) coopérant avec ce drageoir (13) lorsque ce flan (1 ) vient épouser ladite surface sous l'effet de son propre poids. 1. Machine (3) to stamp a blank (1), comprising a matrix (7), a punch (5), a blank holder having a curved surface (9) and bezels (13) able to center a blank ( 1) stamped with respect to said blank holder, characterized in that at least one of said bezels (13) has a profile (19) substantially corresponding to the path followed by the edge (17) of the blank (1) cooperating with this bezel (13) when this blank (1) comes to marry said surface under the effect of its own weight.
2. Machine (3) selon la revendication 1 , caractérisée en ce que ledit drageoir (13) présente un profil sensiblement circulaire. 2. Machine (3) according to claim 1, characterized in that said bezel (13) has a substantially circular profile.
3. Machine (3) selon l'une des revendications 1 ou 2, caractérisée en ce qu'elle comprend une pluralité de drageoirs (13), chaque drageoir (13) présentant un profil correspondant sensiblement à la trajectoire suivie par un bord (17) dudit flan (1 ). 3. Machine (3) according to one of claims 1 or 2, characterized in that it comprises a plurality of bezels (13), each bezel (13) having a profile substantially corresponding to the path followed by an edge (17). ) of said blank (1).
4. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle est adaptée pour emboutir ledit flan par thermoformage. 4. Machine according to any one of the preceding claims, characterized in that it is adapted to stamp said blank by thermoforming.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0954596A FR2947467B1 (en) | 2009-07-03 | 2009-07-03 | MACHINE TO FIT THE GALBAN FLANKS |
| PCT/FR2010/051047 WO2011001053A1 (en) | 2009-07-03 | 2010-05-31 | Machine for stamping curved blanks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2448691A1 true EP2448691A1 (en) | 2012-05-09 |
Family
ID=41431538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10734503A Withdrawn EP2448691A1 (en) | 2009-07-03 | 2010-05-31 | Machine for stamping curved blanks |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2448691A1 (en) |
| FR (1) | FR2947467B1 (en) |
| WO (1) | WO2011001053A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3064200B1 (en) * | 2017-03-22 | 2019-06-14 | Peugeot Citroen Automobiles Sa | DRYER FOR A FLAN BINDING MACHINE COMPRISING A RECEPTION BASE OF INTERCHANGEABLE BODIES WITH DIFFERENTIATED SHAPED SURFACES. |
| CN109047442A (en) * | 2018-08-23 | 2018-12-21 | 四川成飞集成科技股份有限公司 | A kind of drawing die arc backgauge simulation frame |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT316270B (en) * | 1972-09-22 | 1974-07-10 | Verzinkerei Zug Ag | Deep drawing process and deep drawing tool for carrying out the process |
| FR2729594B1 (en) * | 1995-01-19 | 1997-03-21 | Cerec | METHOD AND DEVICE FOR COLD FORMING OF BOMBED FUNDS |
| FR2751247B1 (en) * | 1996-07-16 | 1998-10-16 | Wendling Christiane Kuhn | METHOD FOR MANUFACTURING A METAL BOTTLE FOR CONTAINING A PRESSURIZED FLUID |
-
2009
- 2009-07-03 FR FR0954596A patent/FR2947467B1/en not_active Expired - Fee Related
-
2010
- 2010-05-31 EP EP10734503A patent/EP2448691A1/en not_active Withdrawn
- 2010-05-31 WO PCT/FR2010/051047 patent/WO2011001053A1/en active Application Filing
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011001053A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011001053A1 (en) | 2011-01-06 |
| FR2947467B1 (en) | 2011-06-10 |
| FR2947467A1 (en) | 2011-01-07 |
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Legal Events
| Date | Code | Title | Description |
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