EP3315224B1 - Press intended for shaping a sheet-metal blank and method for servicing such a press - Google Patents

Press intended for shaping a sheet-metal blank and method for servicing such a press Download PDF

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Publication number
EP3315224B1
EP3315224B1 EP17192626.4A EP17192626A EP3315224B1 EP 3315224 B1 EP3315224 B1 EP 3315224B1 EP 17192626 A EP17192626 A EP 17192626A EP 3315224 B1 EP3315224 B1 EP 3315224B1
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EP
European Patent Office
Prior art keywords
holding
down means
press
matrix
blank holder
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EP17192626.4A
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German (de)
French (fr)
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EP3315224A1 (en
Inventor
Jean Richard SPERA
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.)
PSA Automobiles SA
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PSA Automobiles SA
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Publication of EP3315224A1 publication Critical patent/EP3315224A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die
    • 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
    • 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

Definitions

  • the present invention relates to a press intended to shape, by a stamping process, a sheet blank.
  • the invention also relates to a method of maintaining such a press.
  • the invention relates to a press which comprises a die and a punch adapted to stamp a sheet blank when the die descends against the punch.
  • the press includes a blank holder which is guided vertically in translation from a first high position to a second low position when the die is lowered against the punch.
  • the blank holder has at least two parts movable between them, such that the first part has a lateral displacement relative to the second part.
  • the blank holder also includes first biasing means interposed between said first part and said second part of the blank holder.
  • Such a method is for example particularly advantageous for the shaping of a sheet blank to form a roof of a motor vehicle, in particular a roof of a large motor vehicle such as a utility vehicle.
  • return means such as pneumatic or hydraulic springs, which by compressing during the stamping operation, gradually stretch the sheet blank.
  • This type of press generally presents problems for maintenance, because when disassembling part of the blank clamps, these return means must first be immobilized. Excluding such a step lengthens the maintenance operation and represents a danger in the event of improper release of these return means.
  • these return means are essential for the operation of a “Stretch Draw” type press.
  • WO 2012/097812 A1 describes a press intended to shape by a stamping process a sheet blank comprising a die, a punch and a blank holder with a connecting rod.
  • the object of the invention is to alleviate this problem and to propose a press intended to shape a sheet metal blank, in particular a sheet metal blank intended to form a roof, by a drawing process of the "Stretch Draw" type.
  • a large motor vehicle such as a utility vehicle.
  • Such a press must allow maintenance operations to be carried out without requiring numerous preparation operations consisting in blocking all the return means, to allow disassembly of the mobile parts such as the blanks and this in a simple and secure manner.
  • the subject of the invention is a press intended to form a sheet blank, by means of a stamping process, comprising a die and a punch suitable for stamping the sheet blank when the die is lowered against the punch, said press comprising a blank holder which is guided vertically in translation from a first high position to a second low position when the die is lowered against the punch.
  • the blank holder has at least two parts movable between them, such that the first part has a lateral displacement relative to the second part.
  • the blank holder also comprises first return means interposed between said first part and said second part of the blank holder, such that the first return means, in the low position of the blank holder, are arranged so as to have a positioning said relaxed.
  • the second part of the blank holder is in lateral support against the first part of the blank holder.
  • the second part of the blank holder is connected to the press frame by means of a connecting rod adapted to distance laterally said second part of the blank holder during the descent of the matrix.
  • the connecting rod has a first end integral with the second part of the blank holder and a second end integral with the frame, the first end and the second end of the connecting rod form respectively with the second part of the blank holder and with the frame pivot type connection means.
  • the matrix comprises a lateral part adapted to collaborate with the first part of the blank holder to block a lateral edge of the sheet blank, said lateral part comprising second return means suitable for s oppose the lateral displacement, towards the outside of the press, of the first part of the blank holder during the descent of the die.
  • the blank holder comprises a third part which includes guide means making it possible to guide said blank holder vertically in translation.
  • the third part of the blank holder forms a support along which the first part and the second part of the blank holder are guided laterally in translation.
  • the third part of the blank holder has a side wall which forms a stop adapted to limit the lateral displacement in the direction of the punch of the first part of the blank holder.
  • the first return means are adapted to keep the first part of the blank holder in abutment against the stop of the third part of the blank holder.
  • the present invention also relates to a method of maintaining a press according to the invention according to claims 1 - 6 such that, the blank holder being previously positioned in the low position, said method comprises a step of dismantling the first part of the blank holder and a step of reassembling said first part without modifying the operation of the first return means.
  • the figures 2 , 3 and 4 represent partial side views, in section, of the press 1 during different stages of the stamping process of the sheet blank 2.
  • the die 5 of the press 1 begins its descent in the direction of the punch 3.
  • the lateral part 51 of the matrix 5 bears against the first part 41 of the blank holder 4.
  • a rod 22 is formed which is adapted to block the lateral edge 21 of the sheet blank 2 between the lateral part 51 of the matrix 5 and the first part 41 of the blank holder 4.
  • the die 5 of the press 1 continues its descent in the direction of the punch 3, bringing with it a first phase of descent of the blank holder 4.
  • the push rods 45 of the greenhouse blank 4 begins to be compressed, creating a restoring force opposing the descent of the matrix 5.
  • the clamping force of the lateral edge 21 of the sheet blank 2 between the lateral part 51 of the matrix 5 and the first part 41 of the blank holder 4 increases accordingly.
  • the connecting rod 6 pivots by a first angle ⁇ 1 sliding the second part 42 of the blank holder 4, which forms a piston, against the first bearing surface 411 of the first part 41 of the greenhouse -flan 4.
  • the first return means 44 are in a so-called relaxed positioning, causing the free end of the control rod 443 of the piston 441 of the first return means 44 to no longer exert a return force against the second bearing surface 412 of the first part 41 of the blank holder 4.
  • the die 5 of the press 1 is in contact with the punch 3, allowing the press 1 to shape the sheet blank 2.
  • the whole lateral part 51 of the die 5 and blank holder 4 have deviated by a distance d 1 from the central part 54 of the die 5 and the punch 3.
  • This spacing d 1 makes it possible to tension the sheet blank 2 during the stamping phase.
  • This spacing d 1 results from the pivoting of the connecting rod 6 by a second angle ⁇ 2 , causing the second part 42 of the blank holder 4 to slide more against the first bearing surface 411 of the first part 41 of the blank holder 4.
  • the first return means 44 remain in a relaxed position. In this last position of the press 1, the blank holder 4 is in its low position as defined above.
  • FIGS. 5 , 6 and 7 show partial side views in section of the press during different stages of maintenance of the press according to the invention.
  • the entire upper part of the press is removed, making it possible to carry out maintenance operations on the press 1.
  • the blank holder 4 is previously positioned in the low position and the push rods 45 are partially disassembled.
  • the withdrawal of the first part 41 of the blank holder 4 is done without modifying the operation of the first return means 44, thereby simplifying the disassembly and reassembly of the first part 41 of the blank holder 4.
  • the upper part of the press ie the die 5
  • the push rods 45 have not yet been reassembled and the whole press is not not yet returned to its work location.
  • the second return means 53 of the matrix 5 position the lateral part 51 in lateral abutment against the central part 54 of the matrix 5.
  • the blank holder 4 is in the low position, causing the first part 41 of the blank holder 4 is spaced from the spacing d 1 of the third part 43 of the blank holder 4. This results in a problem of alignment of the lateral part 51 of the matrix 5 with the blank holder 4.
  • the oblique bearing surface 522 of the second key 52 of the lateral part 51 of the matrix 5 comes to bear against the oblique bearing surface 415 of the first key 46 of the blank holder 4.
  • the sliding of these oblique bearing surfaces 415 and 522 one against the other aligns the lateral part 51 of the matrix 5 opposite the first part 41 of the blank holder 4 , by opposing the second return means 53 of the matrix 5.
  • the lateral part 51 of the die 5 is correctly aligned with the first part 41 of the blank holder 4.
  • the spacing d 1 is found well between the lateral part 51 and the central part 54 of the matrix 5.
  • the press 1 can now be repositioned along the production line.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

La présente invention concerne une presse destinée à mettre en forme, par un procédé d'emboutissage, un flan de tôle. L'invention concerne aussi un procédé de maintenance d'une telle presse.The present invention relates to a press intended to shape, by a stamping process, a sheet blank. The invention also relates to a method of maintaining such a press.

En particulier, l'invention concerne une presse qui comporte une matrice et un poinçon adaptés pour emboutir un flan de tôle lors de la descente de la matrice contre le poinçon. La presse comporte un serre-flan qui est guidé verticalement en translation d'une première position haute vers une seconde position basse lors de la descente de la matrice contre le poinçon. Le serre-flan comporte au moins deux parties mobiles entre elles, telles que la première partie présente un déplacement latéral par rapport à la deuxième partie. Le serre-flan comporte aussi des premiers moyens de rappel interposés entre ladite première partie et ladite seconde partie du serre-flan.In particular, the invention relates to a press which comprises a die and a punch adapted to stamp a sheet blank when the die descends against the punch. The press includes a blank holder which is guided vertically in translation from a first high position to a second low position when the die is lowered against the punch. The blank holder has at least two parts movable between them, such that the first part has a lateral displacement relative to the second part. The blank holder also includes first biasing means interposed between said first part and said second part of the blank holder.

Il est connu du document DE 103 34 483 d'avoir deux bordures latérales d'un flan en tôle qui sont libérées progressivement lors de l'opération d'emboutissage de la presse, permettant de maintenir une tension constante dans le flan de tôle tout au long de l'opération d'emboutissage. Une telle presse, d'une conception simple, ne permet pas d'augmenter la tension de la tôle durant l'opération d'emboutissage pour tendre d'avantage le flan de tôle et en augmenter la plasticité. Un tel procédé est généralement appelé « Stretch Draw ». Pour ce faire, il existe par exemple le document US3459025 qui permet de tendre la tôle durant l'opération d'emboutissage. Mais une telle presse utilise des moyens coûteux à mettre en œuvre avec un vérin qui tend le flan de tôle à chacune de ces deux extrémités. Une telle presse présente aussi un encombrement qui la rend difficile à mettre en œuvre dans un contexte industriel tel que celui de l'automobile. Un tel procédé est par exemple particulièrement intéressant pour la mise en forme d'un flan de tôle pour former un toit d'un véhicule automobile, en particulier un toit d'un véhicule automobile de grande dimension tel qu'un véhicule utilitaire. Pour remplacer de telles vérin, il est connu d'utiliser des moyens de rappel tels que des ressorts pneumatiques ou hydraulique, qui en se compressant lors de l'opération d'emboutissage, tendent progressivement le flan de tôle. Ce type de presse présente généralement des problèmes pour la maintenance, car lors du démontage d'une partie des serres-flan, il faut préalablement immobiliser ces moyens de rappel. Hors une telle étape allonge l'opération de maintenance et représente un danger en cas de libération non appropriées de ces moyens de rappel. Mais ces moyens de rappel sont indispensable au fonctionnement d'une presse de type « Stretch Draw ».It is known from the document DE 103 34 483 to have two lateral edges of a sheet blank which are released progressively during the pressing operation of the press, making it possible to maintain a constant tension in the sheet blank throughout the drawing operation. Such a press, of a simple design, does not make it possible to increase the tension of the sheet during the stamping operation in order to further tension the sheet blank and to increase its plasticity. Such a process is generally called "Stretch Draw". To do this, there is for example the document US3459025 which allows the sheet to be stretched during the stamping operation. But such a press uses expensive means to implement with a jack which tends the sheet blank at each of these two ends. Such a press also has a size which makes it difficult to implement in an industrial context such as that of the automobile. Such a method is for example particularly advantageous for the shaping of a sheet blank to form a roof of a motor vehicle, in particular a roof of a large motor vehicle such as a utility vehicle. To replace such a jack, it is known to use return means such as pneumatic or hydraulic springs, which by compressing during the stamping operation, gradually stretch the sheet blank. This type of press generally presents problems for maintenance, because when disassembling part of the blank clamps, these return means must first be immobilized. Excluding such a step lengthens the maintenance operation and represents a danger in the event of improper release of these return means. However, these return means are essential for the operation of a “Stretch Draw” type press.

WO 2012/097812 A1 décrit une presse destinée à mettre en forme par un procédé d'emboutissage un flan de tôle comportant une matrice, un poinçon et un serre-flan avec une bielle. L'invention a pour objectif de pallier à ce problème et de proposer une presse destinée à mettre en forme par un procédé d'emboutissage de type « Stretch Draw » un flan de tôle, en particulier un flan de tôle destiné à former un toit d'un véhicule automobile de grande dimension tel qu'un véhicule utilitaire. Une telle presse doit permettre la réalisation des opérations de maintenances sans exiger de nombreuses opérations de préparation consistant à bloquer tous les moyens de rappel, pour permettre le démontage les parties mobiles telles que les serres-flan et cela d'une manière simple et sécurisée. WO 2012/097812 A1 describes a press intended to shape by a stamping process a sheet blank comprising a die, a punch and a blank holder with a connecting rod. The object of the invention is to alleviate this problem and to propose a press intended to shape a sheet metal blank, in particular a sheet metal blank intended to form a roof, by a drawing process of the "Stretch Draw" type. 'a large motor vehicle such as a utility vehicle. Such a press must allow maintenance operations to be carried out without requiring numerous preparation operations consisting in blocking all the return means, to allow disassembly of the mobile parts such as the blanks and this in a simple and secure manner.

L'invention a pour objet une presse destinée à mettre en forme par un procédé d'emboutissage un flan de tôle, comportant une matrice et un poinçon adaptés pour emboutir le flan de tôle lors de la descente de la matrice contre le poinçon, ladite presse comportant un serre-flan qui est guidé verticalement en translation d'une première position haute vers une seconde position basse lors de la descente de la matrice contre le poinçon. Le serre-flan comporte au moins deux parties mobiles entre elles, telles que la première partie présente un déplacement latéral par rapport à la deuxième partie. Le serre-flan comporte aussi des premiers moyens de rappel interposés entre ladite première partie et ladite seconde partie du serre-flan, telle que les premiers moyens de rappel, dans la position basse du serre-flan, sont agencées de manière à présenter un positionnement dit détendu.The subject of the invention is a press intended to form a sheet blank, by means of a stamping process, comprising a die and a punch suitable for stamping the sheet blank when the die is lowered against the punch, said press comprising a blank holder which is guided vertically in translation from a first high position to a second low position when the die is lowered against the punch. The blank holder has at least two parts movable between them, such that the first part has a lateral displacement relative to the second part. The blank holder also comprises first return means interposed between said first part and said second part of the blank holder, such that the first return means, in the low position of the blank holder, are arranged so as to have a positioning said relaxed.

Dans ladite position basse du serre-flan, la seconde partie du serre-flan est en appui latéral contre la première partie du serre-flan.In said bottom position of the blank holder, the second part of the blank holder is in lateral support against the first part of the blank holder.

La deuxième partie du serre-flan est reliée au bâti de la presse par l'intermédiaire d'une bielle adaptée pour éloigner latéralement ladite seconde partie du serre-flan lors de la descente de la matrice. La bielle comporte une première extrémité solidaire de la deuxième partie du serre-flan et une seconde extrémité solidaire du bâti, la première extrémité et la seconde extrémité de la bielle forment respectivement avec la deuxième partie du serre-flan et avec le bâti des moyens de liaisons de type pivot.The second part of the blank holder is connected to the press frame by means of a connecting rod adapted to distance laterally said second part of the blank holder during the descent of the matrix. The connecting rod has a first end integral with the second part of the blank holder and a second end integral with the frame, the first end and the second end of the connecting rod form respectively with the second part of the blank holder and with the frame pivot type connection means.

Selon un deuxième mode de réalisation de l'invention, la matrice comporte une partie latérale adaptée pour collaborer avec la première partie du serre-flan pour bloquer un bord latéral du flan de tôle, ladite partie latérale comportant des seconds moyens de rappel adaptés pour s'opposer au déplacement latéral, vers l'extérieur de la presse, de la première partie du serre-flan lors de la descente de la matrice.According to a second embodiment of the invention, the matrix comprises a lateral part adapted to collaborate with the first part of the blank holder to block a lateral edge of the sheet blank, said lateral part comprising second return means suitable for s oppose the lateral displacement, towards the outside of the press, of the first part of the blank holder during the descent of the die.

Selon un troisième mode de réalisation de l'invention, le serre-flan comporte une troisième partie qui comporte des moyens de guidage permettant de guider verticalement en translation ledit serre-flan. La troisième partie du serre-flan forme un support le long duquel sont guidés latéralement en translation la première partie et la deuxième partie du serre-flan. La troisième partie du serre-flan comporte une paroi latérale qui forme une butée adaptée pour limiter le déplacement latéral en direction du poinçon de la première partie du serre-flan. En position haute du serre-flan, les premiers moyens de rappel sont adaptés pour maintenir en appui la première partie du serre-flan contre la butée de la troisième partie du serre-flan.According to a third embodiment of the invention, the blank holder comprises a third part which includes guide means making it possible to guide said blank holder vertically in translation. The third part of the blank holder forms a support along which the first part and the second part of the blank holder are guided laterally in translation. The third part of the blank holder has a side wall which forms a stop adapted to limit the lateral displacement in the direction of the punch of the first part of the blank holder. In the high position of the blank holder, the first return means are adapted to keep the first part of the blank holder in abutment against the stop of the third part of the blank holder.

La présente invention concerne aussi un procédé de maintenance d'une presse selon l'invention d'après les revendications 1 - 6 tel que, le serre-flan étant préalablement positionné en position basse, ledit procédé comporte une étape de démontage de la première partie du serre-flan et une étape de remontage de ladite première partie sans modifier le fonctionnement des premiers moyens de rappel.The present invention also relates to a method of maintaining a press according to the invention according to claims 1 - 6 such that, the blank holder being previously positioned in the low position, said method comprises a step of dismantling the first part of the blank holder and a step of reassembling said first part without modifying the operation of the first return means.

D'autres objets, caractéristiques et avantages de l'invention apparaîtront plus en détail à la lecture de la description qui suit, ainsi qu'à l'aide des dessins annexés, fournis à titre purement illustratif et non limitatif, parmi lesquels :

  • La figure 1 représente une vue partielle, en coupe, d'une presse destinée à mettre en forme par emboutissage un flan de tôle, selon l'invention ;
  • Les figures 2, 3 et 4 représentent des vues latérales partielles, en coupe, de la presse lors des différentes étapes d'un procédé d'emboutissage du flan de tôle, selon l'invention ; et
  • Les figures 5, 6 et 7 représentent des vues latérales partielles, en coupe, de la presse lors des différentes étapes de maintenance de la presse, selon l'invention.
Other objects, characteristics and advantages of the invention will appear in more detail on reading the description which follows, as well as with the aid of the appended drawings, provided for purely illustrative and nonlimiting purposes, among which:
  • The figure 1 shows a partial view, in section, of a press intended to shape by pressing a sheet blank, according to the invention;
  • The figures 2 , 3 and 4 represent partial side views, in section, of the press during the various stages of a stamping process of the sheet blank, according to the invention; and
  • The figures 5 , 6 and 7 show partial side views, in section, of the press during the various maintenance stages of the press, according to the invention.

La figure 1 représente une vue partielle, en coupe, d'une presse 1 destinée à mettre en forme par emboutissage un flan de tôle 2. La presse 1 comporte un poinçon 3 fixe, bordé au moins le long de deux côtés opposés par deux serres-flan 4. La presse 1 comporte une matrice 5 mobile verticalement en translation qui surplombe le poinçon 3 et les serres-flan 4. Chaque serre-flan 4 comporte un plan de chargement 40 qui forme un support pour un bord latéral 21 du flan de tôle 2. Le poinçon 3 est positionné en dessous du plan de chargement 40 du flan de tôle 2. Chaque serre-flan 4 peut se déplacer entre deux positions :

  • une première position haute de chargement du flan de tôle 2 sur le plan de chargement 40 ; et
  • une seconde position basse correspondant à la position finale d'emboutissage du flan de tôle 2 par la presse 1.
The figure 1 shows a partial view, in section, of a press 1 intended to shape a sheet blank 2 by stamping. The press 1 comprises a fixed punch 3, bordered at least along two opposite sides by two blank clamps 4 The press 1 comprises a matrix 5 movable vertically in translation which overhangs the punch 3 and the blank clamps 4. Each blank clamp 4 has a loading plane 40 which forms a support for a lateral edge 21 of the sheet blank 2. The punch 3 is positioned below the loading plane 40 of the sheet blank 2. Each blank clamp 4 can move between two positions:
  • a first high loading position of the sheet blank 2 on the loading plane 40; and
  • a second lower position corresponding to the final stamping position of the sheet blank 2 by the press 1.

Chaque serre-flan 4 comporte trois parties :

  • une première partie 41 qui est destinée à collaborer avec une partie latérale 51 de la matrice 5 et qui est adaptée pour suivre le déplacement latéral de la partie latérale 51 de la matrice 5 lors de la descente de la matrice 5 ;
  • une deuxième partie 42 qui présente un déplacement latéral par rapport à la première partie 41, avec des premiers moyens de rappel 44 qui sont interposés entre le première partie 41 et la deuxième partie 42 du serre-flan 4 ; et
  • une troisième partie 43 qui comporte des moyens de guidage 45 pour guider verticalement en translation le serre-flan 4 entre la première position haute et la seconde position basse.
Each blank holder 4 has three parts:
  • a first part 41 which is intended to collaborate with a lateral part 51 of the matrix 5 and which is adapted to follow the lateral displacement of the lateral part 51 of the matrix 5 during the descent of the matrix 5;
  • a second part 42 which has a lateral displacement relative to the first part 41, with first return means 44 which are interposed between the first part 41 and the second part 42 of the blank holder 4; and
  • a third part 43 which includes guide means 45 for guiding the blank holder 4 vertically in translation between the first high position and the second low position.

Les moyens de guidage 45 de la troisième partie 43 forment des tiges de poussée. La troisième partie 43 forme un support le long duquel peut coulisser latéralement la seconde partie 42. Dans l'exemple tel que représenté, le coulissement latéral de la seconde partie 42 se fait selon un axe horizontal. Une bielle 6 relie la seconde partie 42 du serre-flan 4 à un bâti 7. Le bâti 7 forme un support pour le poinçon 3 et comporte des ouvertures permettant de guider le coulissement vertical des tiges de poussée 45 du serre-flan 4. Une première extrémité 61 de la bielle 6 et une première extrémité 421 de la deuxième partie 42 du serre-flan 4, sont reliées entre elles en formant une première liaison de type pivot 63. De même, une seconde extrémité 62 de la bielle 6 et une partie du bâti 7, sont reliées entre elles en formant une seconde liaison de type pivot 64. La bielle 6 est positionnée de sorte à éloigner la seconde partie 42 du serre-flan 4 du bâti 7 lors de la descente de la matrice 5. La première partie 41 du serre-flan 4 coulisse en translation le long de la troisième partie 43 du serre-flan 4. En fonction du positionnement vertical de la matrice 5, la première partie 41 du serre-flan 4, est soit déplacée latéralement en entraînant dans son déplacement latéral la partie latérale 51 de la matrice 5, soit reste en appui entre différentes surfaces d'appuis de la seconde partie 42 et de la troisième partie 43 du serre-flan 4, telle que la première partie 41 du serre-flan 4 comporte :

  • une première surface d'appui 411 qui est formée par une première paroi latérale positionnée en regard de l'extrémité libre de la seconde partie 42 du serre-flan 4. La première surface d'appui 411 de la première partie 41 du serre-flan 4 est orientée en regard du poinçon 3, permettant à la deuxième partie 42 de guider vers l'extérieure de la presse 1 la première partie 41 du serre-flan 4, lors de la descente de la matrice 5 ;
  • une deuxième surface d'appui 412 qui est formée par une deuxième paroi latérale positionnée en regard des premiers moyens de rappel 44. La deuxième surface d'appui 412 est orientée vers l'extérieur de la presse 1 ;
  • une troisième surface d'appui 413 qui est formée par une troisième paroi latérale positionnée en regard d'une paroi latérale 431 de la troisième partie 43 du serre-flan 4. La troisième surface d'appui 413 est orientée en regard du poinçon 3 et forme une butée limitant le déplacement de la première partie 41 du serre-flan 4 en direction du poinçon 3 ; et
  • une quatrième surface d'appui 414 qui est formée par une paroi latérale d'une première clavette 46 qui collabore avec une paroi latérale 521 d'une seconde clavette 52 de la partie latérale 51 de la matrice 5.
The guide means 45 of the third part 43 form push rods. The third part 43 forms a support along which the second part 42 can slide laterally. In the example as shown, the lateral sliding of the second part 42 takes place along a horizontal axis. A connecting rod 6 connects the second part 42 of the blank holder 4 to a frame 7. The frame 7 forms a support for the punch 3 and has openings making it possible to guide the vertical sliding of the push rods 45 of the blank holder 4. A first end 61 of the connecting rod 6 and a first end 421 of the second part 42 of the blank holder 4, are connected together forming a first pivot type connection 63. Similarly, a second end 62 of the connecting rod 6 and a part of the frame 7, are connected together by forming a second pivot type connection 64. The connecting rod 6 is positioned so as to move the second part 42 of the blank holder 4 from the frame 7 when the matrix 5 is lowered. first part 41 of the blank holder 4 slides in translation along the third part 43 of the blank holder 4. Depending on the vertical positioning of the matrix 5, the first part 41 of the blank holder 4 is either moved laterally by driving in its lateral movement the lateral part 51 of the matrix 5, or remains in contact between different bearing surfaces of the second part 42 and of the third part 43 of the hold-down 4, such as the first part 41 of the blank holder 4 comprises:
  • a first bearing surface 411 which is formed by a first side wall positioned opposite the free end of the second part 42 of the hold-down 4. The first bearing surface 411 of the first part 41 of the hold-down 4 is oriented opposite the punch 3, allowing the second part 42 to guide the press 1 towards the outside of the press 1 the first part 41 of the blank holder 4, during the descent of the die 5;
  • a second bearing surface 412 which is formed by a second side wall positioned opposite the first return means 44. The second bearing surface 412 is oriented towards the outside of the press 1;
  • a third bearing surface 413 which is formed by a third side wall positioned opposite a side wall 431 of the third part 43 of the blank holder 4. The third bearing surface 413 is oriented opposite the punch 3 and forms a stop limiting the movement of the first part 41 of the blank holder 4 in the direction of the punch 3; and
  • a fourth bearing surface 414 which is formed by a side wall of a first key 46 which collaborates with a side wall 521 of a second key 52 of the side part 51 of the matrix 5.

L'extrémité libre de la seconde partie 42 du serre-flan 4, comporte un tampon d'appui 423 qui forme une surface de contact entre la première partie 41 et la deuxième partie 42 du serre-flan 4. Les premiers moyens de rappel 44 sont formés par un ressort hydraulique qui comporte un piston 441 qui coulisse dans une chambre de compression 442 formée dans une cavité de la seconde partie 42 du serre-flan 4. Le piston 441 comporte une tige de commande 443 dont l'extrémité libre est en appui contre la deuxième surface d'appui 412 de la première partie 41 du serre-flan 4. Dans la position haute de la matrice 5, telle que représentée dans cette figure, nous avons :

  • la seconde clavette 52 de la partie latérale 51 de la matrice 5 qui est positionnée au-dessus de la première clavette 46 de la première partie 41 du serre-flan 4. La première clavette 46 de la première partie 41 du serre-flan 4 comporte, au-dessus de la quatrième surface d'appui 414, une surface d'appui oblique 415 positionnée en regard d'une surface d'appui oblique 522 de la seconde clavette 52 de la partie latérale 51 de la matrice 5. Les deux surfaces d'appui obliques 415 et 522 des deux clavettes 46 et 52 sont parallèles entre elles. Des seconds moyens de rappel 53 maintiennent en appui latéral la partie latérale 51 de la matrice 5 contre une partie centrale 54 de la matrice 5 ; et
  • le serre-flan 4 qui est positionné dans sa première position haute, faisant que les premiers moyens de rappel 44 sont dans une position compressée. La tige de commande 443 crée alors une force de poussée contre la deuxième surface d'appui 412 en direction du poinçon 3. Cette force de poussée maintien la troisième surface d'appui 413 en appui contre la paroi latérale 431 de la troisième partie 43 du serre-flan 4.
The free end of the second part 42 of the blank holder 4 includes a support pad 423 which forms a contact surface between the first part 41 and the second part 42 of the blank holder 4. The first return means 44 are formed by a hydraulic spring which comprises a piston 441 which slides in a compression chamber 442 formed in a cavity in the second part 42 of the blank holder 4. The piston 441 comprises a control rod 443 whose free end is in support against the second support surface 412 of the first part 41 of the blank holder 4. In the high position of the die 5, as shown in this figure, we have:
  • the second key 52 of the lateral part 51 of the matrix 5 which is positioned above the first key 46 of the first part 41 of the hold-down 4. The first key 46 of the first part 41 of the hold-down 4 comprises , above the fourth bearing surface 414, an oblique bearing surface 415 positioned opposite an oblique bearing surface 522 of the second key 52 of the lateral part 51 of the matrix 5. The two surfaces oblique support 415 and 522 of the two keys 46 and 52 are mutually parallel. Second return means 53 maintain the lateral part 51 of the matrix 5 in lateral support against a central part 54 of the matrix 5; and
  • the blank holder 4 which is positioned in its first high position, causing the first return means 44 to be in a compressed position. The control rod 443 then creates a pushing force against the second bearing surface 412 in the direction of the punch 3. This pushing force maintains the third bearing surface 413 in abutment against the side wall 431 of the third part 43 of the hold-down 4.

Les figures 2, 3 et 4 représentent des vues latérales partielles, en coupe, de la presse 1 lors de différentes étapes du procédé d'emboutissage du flan de tôle 2.The figures 2 , 3 and 4 represent partial side views, in section, of the press 1 during different stages of the stamping process of the sheet blank 2.

Sur la figure 2, la matrice 5 de la presse 1 amorce sa descente en direction du poinçon 3. La partie latérale 51 de la matrice 5 vient en appui contre la première partie 41 du serre-flan 4. Le long du bord latéral 21 du flan de tôle 2 est formé un jonc 22 adapté pour bloquer le bord latéral 21 du flan de tôle 2 entre la partie latérale 51 de la matrice 5 et la première partie 41 du serre-flan 4.On the figure 2 , the die 5 of the press 1 begins its descent in the direction of the punch 3. The lateral part 51 of the matrix 5 bears against the first part 41 of the blank holder 4. Along the lateral edge 21 of the sheet blank 2 a rod 22 is formed which is adapted to block the lateral edge 21 of the sheet blank 2 between the lateral part 51 of the matrix 5 and the first part 41 of the blank holder 4.

Sur la figure 3, la matrice 5 de la presse 1 continue sa descente en direction du poinçon 3, entraînant avec lui une première phase de descente du serre-flan 4. Durant cette première phase de descente du serre-flan 4, les tiges de poussée 45 du serre-flan 4 commence à être compressées, créant une force de rappel s'opposant à la descente de la matrice 5. Par réaction, la force de serrage du bord latéral 21 du flan de tôle 2 entre la partie latérale 51 de la matrice 5 et la première partie 41 du serre-flan 4 augmente d'autant. Durant cette deuxième phase de descente, la bielle 6 pivote d'un premier angle α1 faisant coulisser la seconde partie 42 de serre-flan 4, qui forme un piston, contre la première surface d'appui 411 de la première partie 41 du serre-flan 4. Les premiers moyens de rappel 44 sont dans un positionnement dit détendu, faisant que l'extrémité libre de la tige de commande 443 du piston 441 des premiers moyens de rappel 44 n'exercent plus de force de rappel contre la seconde surface d'appui 412 de la première partie 41 du serre-flan 4.On the figure 3 , the die 5 of the press 1 continues its descent in the direction of the punch 3, bringing with it a first phase of descent of the blank holder 4. During this first phase of descent of the blank holder 4, the push rods 45 of the greenhouse blank 4 begins to be compressed, creating a restoring force opposing the descent of the matrix 5. By reaction, the clamping force of the lateral edge 21 of the sheet blank 2 between the lateral part 51 of the matrix 5 and the first part 41 of the blank holder 4 increases accordingly. During this second descent phase, the connecting rod 6 pivots by a first angle α 1 sliding the second part 42 of the blank holder 4, which forms a piston, against the first bearing surface 411 of the first part 41 of the greenhouse -flan 4. The first return means 44 are in a so-called relaxed positioning, causing the free end of the control rod 443 of the piston 441 of the first return means 44 to no longer exert a return force against the second bearing surface 412 of the first part 41 of the blank holder 4.

Sur la figure 4, la matrice 5 de la presse 1 est au contact du poinçon 3, permettant à la presse 1 de mettre en forme le flan de tôle 2. Durant cette dernière phase de descente de la matrice 5, l'ensemble partie latérale 51 de la matrice 5 et serre-flan 4 se sont écartés d'une distance d1 de la partie centrale 54 de la matrice 5 et du poinçon 3. Cette écartement d1 permet de tendre le flan de tôle 2 durant la phase d'emboutissage. Cet écartement d1 résulte du pivotement de la bielle 6 d'un second angle α2, faisant davantage coulisser la seconde partie 42 de serre-flan 4 contre la première surface d'appui 411 de la première partie 41 du serre-flan 4. Les premiers moyens de rappel 44 restent dans un positionnement détendu. Dans cette dernière position de la presse 1, le serre-flan 4 est dans sa position basse telle que définie précédemment.On the figure 4 , the die 5 of the press 1 is in contact with the punch 3, allowing the press 1 to shape the sheet blank 2. During this last phase of descent of the die 5, the whole lateral part 51 of the die 5 and blank holder 4 have deviated by a distance d 1 from the central part 54 of the die 5 and the punch 3. This spacing d 1 makes it possible to tension the sheet blank 2 during the stamping phase. This spacing d 1 results from the pivoting of the connecting rod 6 by a second angle α 2 , causing the second part 42 of the blank holder 4 to slide more against the first bearing surface 411 of the first part 41 of the blank holder 4. The first return means 44 remain in a relaxed position. In this last position of the press 1, the blank holder 4 is in its low position as defined above.

Les figures 5, 6 et 7 représentent des vues latérales partielles en coupe de la presse lors de différentes étapes de maintenance de la presse selon l'invention.The figures 5 , 6 and 7 show partial side views in section of the press during different stages of maintenance of the press according to the invention.

Sur la figure 5, toute la partie supérieure de la presse est retirée, permettant de faire des opérations de maintenance de la presse 1. Le serre-flan 4 est préalablement positionné en position basse et les tiges de poussé 45 sont partiellement démontées. Comme les premiers moyens de rappel 44 sont dans un positionnement détendu, le retrait de la première partie 41 du serre-flan 4 se fait sans modifier le fonctionnement des premiers moyens de rappel 44, simplifiant d'autant le démontage et remontage de la première partie 41 du serre-flan 4.On the figure 5 , the entire upper part of the press is removed, making it possible to carry out maintenance operations on the press 1. The blank holder 4 is previously positioned in the low position and the push rods 45 are partially disassembled. As the first return means 44 are in a relaxed position, the withdrawal of the first part 41 of the blank holder 4 is done without modifying the operation of the first return means 44, thereby simplifying the disassembly and reassembly of the first part 41 of the blank holder 4.

Sur la figure 6, la partie supérieure de la presse, soit la matrice 5, est remise en position au-dessus du poinçon 3 et du serre-flan 4. Les tiges de poussé 45 ne sont pas encore remontées et l'ensemble de la presse n'est pas encore remis à son emplacement de travail. Durant cette étape de remontage, les seconds moyens de rappel 53 de la matrice 5 positionnent la partie latérale 51 en appui latéral contre la partie centrale 54 de la matrice 5. Le serre-flan 4 est en position basse, faisant que la première partie 41 du serre-flan 4 est espacée de l'écartement d1 de la troisième partie 43 du serre-flan 4. Il en résulte un problème d'alignement de la partie latérale 51 de la matrice 5 avec le serre-flan 4. Pour corriger un tel alignement, la surface d'appui oblique 522 de la seconde clavette 52 de la parte latérale 51 de la matrice 5 vient en appui contre de la surface d'appui oblique 415 de la première clavette 46 du serre-flan 4. Le coulissement de ces surfaces d'appui obliques 415 et 522 l'une contre l'autre, aligne la parte latérale 51 de la matrice 5 en face de la première partie 41 du serre-flan 4, en s'opposant aux seconds moyens de rappel 53 de la matrice 5.On the figure 6 , the upper part of the press, ie the die 5, is returned to position above the punch 3 and the blank holder 4. The push rods 45 have not yet been reassembled and the whole press is not not yet returned to its work location. During this reassembly step, the second return means 53 of the matrix 5 position the lateral part 51 in lateral abutment against the central part 54 of the matrix 5. The blank holder 4 is in the low position, causing the first part 41 of the blank holder 4 is spaced from the spacing d 1 of the third part 43 of the blank holder 4. This results in a problem of alignment of the lateral part 51 of the matrix 5 with the blank holder 4. To correct such alignment, the oblique bearing surface 522 of the second key 52 of the lateral part 51 of the matrix 5 comes to bear against the oblique bearing surface 415 of the first key 46 of the blank holder 4. The sliding of these oblique bearing surfaces 415 and 522 one against the other, aligns the lateral part 51 of the matrix 5 opposite the first part 41 of the blank holder 4 , by opposing the second return means 53 of the matrix 5.

Sur la figure 7, la partie latérale 51 de la matrice 5 est correctement alignée avec la première partie 41 du serre-flan 4. L'écartement d1 se retrouve bien entre la partie latérale 51 et la partie centrale 54 de la matrice 5. La presse 1 peut maintenant être repositionnée le long de la chaîne de production.On the figure 7 , the lateral part 51 of the die 5 is correctly aligned with the first part 41 of the blank holder 4. The spacing d 1 is found well between the lateral part 51 and the central part 54 of the matrix 5. The press 1 can now be repositioned along the production line.

Claims (7)

  1. Press (1) intended to shape, by a method of stamping a sheet metal blank (2), comprising a matrix (5) and a punch (3) suitable for stamping the sheet metal blank (2) during the descent of the matrix (5) against the punch (3), said press comprising a holding-down means (4) which is guided vertically in translation from a first high position to a second low position during the descent of the matrix (5) against the punch (3), said holding-down means (4) comprising at least two portions (41, 42) mobile together, such that the first portion (41) has a lateral movement with respect to the second portion (42), said holding-down means (4) also comprising first return means (44), press wherein the first return means (44), in the low position of the holding-down means (4), are arranged so as to have a positioning called relaxed positioning, and in said low position of the holding-down means (4), the second portion (42) of the holding-down means (4) laterally bears against the first portion (41) of the holding-down means (4), said second portion (42) of the holding-down means (4) being connected to the structure (7) of the press (1) by way of a rod (6) suitable for laterally extending said second portion (42) of the holding-down means (4) during the descent of the matrix (5), the rod (6) comprising a first end (61) integral with the second portion (42) of the holding-down means (4) and a second end (62) integral with the structure (7), the first end (61) and the second end (62) of the rod (7) respectively forming, with the second portion (42) of the holding-down means (4) and with the structure (7), pivot-type connection means, characterised in that the first return means (44) are inserted between said first portion (41) and said second portion (42) of the holding-down means (4).
  2. Press (1) according to claim 1, characterised in that the matrix (5) comprises a lateral portion (51) suitable for collaborating with the first portion (41) of the holding-down means (4) to block a lateral edge (21) of the sheet metal blank (2), said lateral portion (51) comprising second return means (53) suitable for opposing the lateral movement, towards the outside of the press (1), of the first portion (41) of the holding-down means (4) during the descent of the matrix (5).
  3. Press (1) according to any one of the preceding claims, characterised in that the holding-down means (4) comprises a third portion (43) which comprises guiding means (45) making it possible to vertically guide in translation, said holding-down means (4).
  4. Press (1) according to claim 5, characterised in that the third portion (43) of the holding-down means (4) forms a support along which the first portion (41) and the second portion (42) of the holding-down means (4) are guided laterally in translation.
  5. Press (1) according to claim 5 or 6, characterised in that the third portion (43) of the holding-down means (4) comprises a lateral wall (431) which forms an abutment suitable for limiting the lateral movement in the direction of the punch (3) of the first portion (41) of the holding-down means (4).
  6. Press (1) according to claim 6 or 7, characterised in that, in the high position of the holding-down means (4), the first return means (44) are suitable for holding the first portion (41) of the holding-down means (4) born against the abutment (431) of the third portion (43) of the holding-down means (4).
  7. Method for holding a press (1) according to any one of the preceding claims, wherein: the second portion (42) of the holding-down means (4) is laterally born against the first portion (41) of the holding-down means (4), said second portion (42) of the holding-down means (4) being connected to the structure (7) of the press (1) by way of a rod (6) suitable for laterally extending said second portion (42) of the holding-down means (4) during the descent of the matrix (5), the rod (6) comprising a first end (61) integral with the second portion (42) of the holding-down means (4) and a second end (62) integral with the structure (7), the first end (61) and the second end (62) of the rod (7) respectively forming, with the second portion (42) of the holding-down means (4) and with the structure (7), pivot-type connection means;
    the holding-down means (4) being positioned beforehand in the low position, said method comprises a step of disassembling the first portion (41) from the holding-down means (4) and a step of reassembling said first portion (41) without modifying the functioning of the first return means (44), characterised in that the first return means (44) are inserted between said first portion (41) and said second portion (42) of the holding-down means (4).
EP17192626.4A 2016-10-26 2017-09-22 Press intended for shaping a sheet-metal blank and method for servicing such a press Active EP3315224B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1660369A FR3057791B1 (en) 2016-10-26 2016-10-26 PRESS FOR SHAPING A FLAN OF A SHEET AND METHOD OF MAINTAINING SUCH A PRESS

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EP3315224A1 EP3315224A1 (en) 2018-05-02
EP3315224B1 true EP3315224B1 (en) 2020-04-08

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ES (1) ES2784708T3 (en)
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012097812A1 (en) * 2011-01-21 2012-07-26 Giw Verwaltungs- Und Vertriebs Gmbh Method and device for drawing sheet metal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459025A (en) 1967-12-07 1969-08-05 Cyril Bath Co Stretching fixture with quadrilateral linkage control of stretch head movements
ATE221423T1 (en) * 1997-09-18 2002-08-15 Cosma Int Inc STRETCHING AND DRAWING TOOL AND ASSOCIATED METHOD
DE10334483B4 (en) * 2003-07-29 2006-09-28 Daimlerchrysler Ag Method and drawing tool for producing a sheet metal part from a circuit board
JP5319748B2 (en) * 2011-09-09 2013-10-16 エムズ株式会社 Press molding method and press molding apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012097812A1 (en) * 2011-01-21 2012-07-26 Giw Verwaltungs- Und Vertriebs Gmbh Method and device for drawing sheet metal

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ES2784708T3 (en) 2020-09-30
FR3057791A1 (en) 2018-04-27
FR3057791B1 (en) 2018-11-23
EP3315224A1 (en) 2018-05-02

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