EP3538292A1 - Press tooling for sheet metal of relatively large dimensions, notably for motor vehicles - Google Patents

Press tooling for sheet metal of relatively large dimensions, notably for motor vehicles

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Publication number
EP3538292A1
EP3538292A1 EP17794004.6A EP17794004A EP3538292A1 EP 3538292 A1 EP3538292 A1 EP 3538292A1 EP 17794004 A EP17794004 A EP 17794004A EP 3538292 A1 EP3538292 A1 EP 3538292A1
Authority
EP
European Patent Office
Prior art keywords
stamping
blank holder
blank
vertical
base
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
Application number
EP17794004.6A
Other languages
German (de)
French (fr)
Other versions
EP3538292B1 (en
Inventor
Jacky FROMENTIN
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
Original Assignee
PSA Automobiles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PSA Automobiles SA filed Critical PSA Automobiles SA
Publication of EP3538292A1 publication Critical patent/EP3538292A1/en
Application granted granted Critical
Publication of EP3538292B1 publication Critical patent/EP3538292B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/02—Die-cushions
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

  • the present invention relates to a press tooling and is more particularly a sheet metal stamping tool, in particular metal blanks of relatively large size used in the automotive industry.
  • a stamping tool comprising a fixed table on which rests a base called mobile rolling platform on which is fixed a punch.
  • This tooling further comprises a hydraulic stamping pad housed under the base, a blank holder located above the base and comprising, integral with it, vertical columns with lower ends comprising bobechons respectively bearing on ends upper rods or vertical drawing candles through holes in the base and the lower ends are supported on the stamping pad.
  • the stamping tool also comprises an upper frame supporting a matrix adapted to move vertically towards the blank holder, the latter and the matrix respectively comprising two spans between which is enclosed the blank for the stamping phase.
  • the stamping rods are able to transmit the clamping force of the cushion blank holder through the bobbins and columns of the blank holder while the die down on the blank holder so as to allow the blank to be sandwiched between the two ranges of the blank holder and die before the stamping operation of this blank.
  • the scope of the blank holder must be perfectly homogeneous to ensure a uniform clamping of the blank between the reaches of the blank holder and die, regulating the blank feed and ensure the quality of the stamped part on any manufacturing press of the same model.
  • the present invention aims to overcome the above disadvantages of the prior art.
  • the invention proposes a tool for stamping a blank for the formation of a stamped part, in particular of a motor vehicle, comprising a lower base fixed on a support table and comprising a punch , a stamping cushion housed under the support table, a blank holder located above the base and comprising vertical columns with lower ends comprising bobechons respectively bearing on upper ends of vertical stamping rods through bores; of the base and the support table and whose lower ends rest on the stamping pad, a slide supporting a matrix able to move vertically towards the blank holder, the latter and the matrix respectively having two spans between which may be clasped blank, the stamping rods being adapted to transmit the clamping force of the stamping pad within range of the clamp-fl year, and which is characterized in that the vertical columns of the blank holder are each able to comprise between its end and the bobechon corresponding at least one foil allowing elastic deformation of the blank holder by the stamping pad and the d-shaped rods. stamping to ensure a
  • Each bobechon is removably fixed by screwing at the end of the corresponding vertical column of the blank holder and the foil can be fixed by clamping between the bobechon and the end of the vertical column of the blank holder.
  • the thickness of the foil is between 1/10 mm and 1 mm depending on the stamping tool used.
  • the vertical columns comprising the foils are located vis-à-vis an area of the scope of the blank holder having a surface gap relative to the remaining homogeneous surface of the scope.
  • FIG. 1 is an exploded perspective view of a portion of the stamping tool of the invention and occupying an open position before clamping a blank;
  • FIG. 2 is a schematic view showing a complementary portion of the stamping tool of Figure 1;
  • FIG. 3 is a partial sectional view of the lower part of the stamping tool of Figures 1 and 2;
  • FIG. 4 is a view of the stamping tool of Figure 1 in the closed position
  • FIG. 5 is a view from above of the blank holder of the stamping tool and whose blank holder surface has a uniform clamping surface of the blank;
  • FIG. 6 is a view similar to that of Figure 5 and showing a range of the range of the blank holder does not ensure uniformity clamping of the blank;
  • FIG. 7 is a perspective view of the blank holder according to the invention.
  • FIG. 8 is an enlarged view of the portion circled at VIII of FIG. 7.
  • the reference numeral 1 denotes press tooling, more particularly sheet metal stamping tools, in particular metal blanks of relatively large size used in the automotive industry.
  • the stamped part formed from the blank stamped by the stamping tool 1 may be constituted by a side of the passenger compartment or the roof of a motor vehicle.
  • the stamping tool 1 comprises a base or lower frame 2 fixed on the upper surface of a support table 3 (also called PMR or moving mobile platform) belonging to the press and a matrix 5 fixed under the slider 17 also belonging to the press.
  • the base or lower frame 2 consists of a punch 4 and a blank holder 8 is vertically movable above the base 2 as will be seen later.
  • the stamping tool 1 is further actuated by a hydraulic stamping pad 7 belonging to the press housed and under the support table 3.
  • the blank holder 8 comprises a plurality of cylindrical vertical columns 9 extending below the blank holder 8 opposite the scope 10 of the blank holder 8 for clamping with the scope 1 1 of the matrix 5 the blank 6 during the stamping phase of this blank.
  • the vertical columns 9 of the blank holder 8, which pass through holes 14 of the base 2 and the support table 3, comprise at their lower ends bobbins 12, which are removably attached to the lower ends of these columns by screwing .
  • the stamping tool 1 also comprises vertical stamping rods or candles 13 respectively passing through the vertical bores 14 and whose lower ends rest on the stamping pad 7.
  • the vertical columns 9 of the blank holder 8 are supported by their bobbins 12 respectively on the upper ends of the vertical stamping rods 13.
  • the stamping tool 1 further comprises an upper frame 15 comprising two parallel uprights 16 resting on the table 3 and which comprise the slider 17 adapted to move vertically as symbolized by the double arrow F in Figure 2 under the action of hydraulic cylinders 18, the slide 17 supporting the matrix 5.
  • the die 5 can move vertically towards the blank holder 8.
  • the latter is vertically guided relative to the base 2 by its corners in sliding contact in square corners 2a of the base 2.
  • FIG. 5 represents the bearing surface 10 of the flank clamp 8, the entire surface of which is homogeneous, that is to say that it ensures a uniform tightening of the blank 6 between the bearing surface 10 and the bearing surface 1 1 of the matrix 5 to ensure a good regulation of the supply of the sheet blank.
  • FIG. 6 represents the situation in which the span of the blank holder 8 is correct, that is to say homogeneous over a large part of its surface, but has a portion of surface that is offset relative to the correct range.
  • the invention proposes to insert between the bobbins 12 and the lower ends of the cylindrical columns 9 of the blank holder 8 respectively foils 19 for cylindrical columns 9 located vis-à-vis the zone 10a spaced apart from the homogeneous remaining surface of the span 10 of the blank holder 8.
  • the hydraulic cushion will exert on the cylindrical columns 9 of the blank holder 8 a vertical upward force deforming or elastically screwing the blank holder 8 so that the bearing 10 thereof ensures a uniform clamping of the blank 6 between the bearing surface 10 of the blank holder 8 and the scope 1 1 of the matrix 5 and this thanks to the presence of foils 19.
  • the foils 19 are in this case in the form of tight rings between the lower ends of the cylindrical columns 9 and the corresponding bobbers 12 screwed into these ends.
  • the thicknesses of the foils 19 depend on the amount of offset between the range 10a and the remaining homogeneous range 10 of the blank holder 8 according to each hydraulic press used of the same model and the same mark.
  • each foil 19 can vary between 1/10 mm to 1 mm depending on the presses used.
  • the blank holder 8 is made of a material allowing it to deform elastically so as to use it on another press of the same type as the previous one.
  • the invention therefore consists in producing a deformation of the blank holder 8 by wedging the bobechons or spacers 12 with foils 19 so as to adapt the span 10 of the blank holder to the manufacturing press and thus find an identical clamping to the press of focus. This avoids the grinding and honing operations previously carried out on the manufacturing presses.
  • the invention thus has the advantage of saving time for adaptation to a production press and does not require grinding or honing on the production line and, consequently, does not produce any pollution associated with these products. grinding and honing operations, resulting in better quality stamped parts. In addition, the time spent on the production line is less important, therefore decreasing manufacturing costs.

Landscapes

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

Abstract

The abstract relates to press tooling for pressing sheet metal of relatively large dimensions notably for motor vehicles. According to the invention, the press tooling is characterized in that the vertical posts (9) of the clamp (8) are each able to comprise, between their end and the corresponding socket (12) at least one foil (19) allowing elastic deformation of the clamp (8) by the press and the press rods so as to ensure uniform clamping of the sheet over the entire bearing surface (10) of the clamp (8). The invention finds an application in the automotive industry.

Description

"OUTILLAGE D'EMBOUTISSAGE DE TOLES DE RELATIVEMENT GRANDES DIMENSIONS NOTAMMENT POUR VEHICULE AUTOMOBILE"  "TOOLING OF SHEETS OF RELATIVELY LARGE DIMENSIONS, IN PARTICULAR FOR MOTOR VEHICLES"
[0001 ] La présente invention concerne un outillage de presse et vise plus particulièrement un outillage d'emboutissage de tôles, notamment de flans métalliques de relativement grandes dimensions utilisés dans l'industrie automobile. The present invention relates to a press tooling and is more particularly a sheet metal stamping tool, in particular metal blanks of relatively large size used in the automotive industry.
[0002] On connaît un outillage d'emboutissage comprenant une table fixe sur laquelle repose un socle dénommé plateau mobile roulant sur lequel est fixé un poinçon. Cet outillage comprend en outre un coussin hydraulique d'emboutissage logé sous le socle, un serre-flan situé au-dessus du socle et comprenant, solidaires de celui-ci, des colonnes verticales à extrémités inférieures comprenant des bobéchons en appui respectivement sur des extrémités supérieures de tiges ou chandelles d'emboutissage verticales traversant des perçages du socle et dont les extrémités inférieures sont en appui sur le coussin d'emboutissage. A stamping tool is known comprising a fixed table on which rests a base called mobile rolling platform on which is fixed a punch. This tooling further comprises a hydraulic stamping pad housed under the base, a blank holder located above the base and comprising, integral with it, vertical columns with lower ends comprising bobechons respectively bearing on ends upper rods or vertical drawing candles through holes in the base and the lower ends are supported on the stamping pad.
[0003] L'outillage d'emboutissage comprend également un bâti supérieur supportant une matrice apte à se déplacer verticalement vers le serre-flan, ce dernier et la matrice comportant respectivement deux portées entre lesquelles est enserré le flan pour la phase d'emboutissage. The stamping tool also comprises an upper frame supporting a matrix adapted to move vertically towards the blank holder, the latter and the matrix respectively comprising two spans between which is enclosed the blank for the stamping phase.
[0004] Les tiges d'emboutissage sont aptes à transmettre l'effort de serrage du coussin au serre-flan par l'intermédiaire des bobéchons et des colonnes du serre-flan pendant que la matrice descend sur le serre-flan de manière à permettre au flan d'être enserré entre les deux portées du serre-flan et de la matrice avant l'opération d'emboutissage de ce flan. The stamping rods are able to transmit the clamping force of the cushion blank holder through the bobbins and columns of the blank holder while the die down on the blank holder so as to allow the blank to be sandwiched between the two ranges of the blank holder and die before the stamping operation of this blank.
[0005] La portée du serre-flan doit être parfaitement homogène pour assurer un serrage homogène du flan entre les portées du serre-flan et de la matrice, la régulation de l'alimentation du flan et garantir la qualité de la pièce emboutie sur toute presse de fabrication d'un même modèle. The scope of the blank holder must be perfectly homogeneous to ensure a uniform clamping of the blank between the reaches of the blank holder and die, regulating the blank feed and ensure the quality of the stamped part on any manufacturing press of the same model.
[0006] Pour obtenir une portée de serre-flan correcte, celle-ci est réalisée par meulage et finalisée par pierrage chez un outilleur. Lors du transfert des outils sur le site où se trouve la presse de fabrication, il faut retrouver l'ajustage réalisé chez l'outilleur pour conserver l'emboutissabilité et la qualité des pièces embouties. [0007] Cependant, les presses d'un même modèle et d'une même marque ne sont pas rigoureusement identiques, conduisant à une non homogénéité ou décalage de la portée du serre-flan, de sorte qu'un nouvel ajustage est indispensable pour retrouver un serrage du flan sur la presse de fabrication identique à celui obtenu chez l'outilleur. Jusqu'à maintenant, cet ajustage est repris par meulage et pierrage de manière identique aux meulage et pierrage chez l'outilleur. Ce nouvel ajustage est long, coûteux et génère de la pollution sur la ligne de fabrication suite aux projections de limailles et grains de meule. To obtain a proper blank holder span, it is achieved by grinding and finalized by honing at a toolmaker. When transferring the tools to the site where the manufacturing press is located, it is necessary to find the adjustment made by the toolmaker to preserve the drawability and the quality of the stamped parts. However, the presses of the same model and the same mark are not strictly identical, leading to a non-homogeneity or shift of the scope. the blank holder, so that a new adjustment is essential to find a tightening of the blank on the same manufacturing press that obtained at the toolmaker. Until now, this adjustment is resumed by grinding and honing in the same manner as grinding and honing by the toolmaker. This new fitting is time-consuming, costly and generates pollution on the production line following splashing of grit and grit.
[0008] La présente invention a pour but de palier les inconvénients ci-dessus de l'art ant érieur. The present invention aims to overcome the above disadvantages of the prior art.
[0009] A cet effet, l'invention propose un outillage d'emboutissage d'un flan pour la formation d'une pièce emboutie, notamment d'un véhicule automobile, comprenant un socle inférieur fixé sur une table de support et comportant un poinçon, un coussin d'emboutissage logé sous la table de support, un serre-flan situé au-dessus du socle et comportant des colonnes verticales à extrémités inférieures comportant des bobéchons en appui respectivement sur des extrémités supérieures de tiges d'emboutissage verticales traversant des perçages du socle et de la table de support et dont les extrémités inférieures sont en appui sur le coussin d'emboutissage, un coulisseau supportant une matrice apte à se déplacer verticalement vers le serre-flan, ce dernier et la matrice comportant respectivement deux portées entres lesquelles peut être enserré le flan, les tiges d'emboutissage étant aptes à transmettre l'effort de serrage du coussin d'emboutissage à la portée du serre-flan, et qui est caractérisé en ce que les colonnes verticales du serre-flan sont aptes à comporter chacune entre son extrémité et le bobéchon correspondant au moins un clinquant permettant une déformation élastique du serre-flan par le coussin d'emboutissage et les tiges d'emboutissage pour assurer un serrage homogène du flan sur toute la portée du serre-flan. For this purpose, the invention proposes a tool for stamping a blank for the formation of a stamped part, in particular of a motor vehicle, comprising a lower base fixed on a support table and comprising a punch , a stamping cushion housed under the support table, a blank holder located above the base and comprising vertical columns with lower ends comprising bobechons respectively bearing on upper ends of vertical stamping rods through bores; of the base and the support table and whose lower ends rest on the stamping pad, a slide supporting a matrix able to move vertically towards the blank holder, the latter and the matrix respectively having two spans between which may be clasped blank, the stamping rods being adapted to transmit the clamping force of the stamping pad within range of the clamp-fl year, and which is characterized in that the vertical columns of the blank holder are each able to comprise between its end and the bobechon corresponding at least one foil allowing elastic deformation of the blank holder by the stamping pad and the d-shaped rods. stamping to ensure a uniform clamping of the blank over the entire scope of the blank holder.
[0010] Chaque bobéchon est amoviblement fixé par vissage à l'extrémité de la colonne verticale correspondante du serre-flan et le clinquant peut être fixé par serrage entre le bobéchon et l'extrémité de la colonne verticale du serre-flan. Each bobechon is removably fixed by screwing at the end of the corresponding vertical column of the blank holder and the foil can be fixed by clamping between the bobechon and the end of the vertical column of the blank holder.
[001 1 ] L'épaisseur du clinquant est comprise entre un 1/10 mm et 1 mm en fonction de l'outillage d'emboutissage utilisé. [001 1] The thickness of the foil is between 1/10 mm and 1 mm depending on the stamping tool used.
[0012] Les colonnes verticales comportant les clinquants sont situées en vis-à-vis d'une zone de la portée du serre-flan présentant un écart de surface relativement à la surface restante homogène de la portée. The vertical columns comprising the foils are located vis-à-vis an area of the scope of the blank holder having a surface gap relative to the remaining homogeneous surface of the scope.
[0013] U'invention sera mieux comprise, et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement dans la description explicative qui va suivre faite en référence aux dessins annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels : [0013] The invention will be better understood, and other objects, features, details and advantages thereof will become more clearly apparent in the explanatory description which will follow with reference to the accompanying drawings given solely by way of example illustrating an embodiment of the invention and in which:
- La figure 1 est une vue en perspective éclatée d'une partie de l'outillage d'emboutissage de l'invention et occupant une position ouverte avant serrage d'un flan ; - la figure 2 est une vue schématique représentant une partie complémentaire de l'outillage d'emboutissage de la figure 1 ; - Figure 1 is an exploded perspective view of a portion of the stamping tool of the invention and occupying an open position before clamping a blank; - Figure 2 is a schematic view showing a complementary portion of the stamping tool of Figure 1;
- la figure 3 est une vue partielle en coupe de la partie inférieure de l'outillage d'emboutissage des figures 1 et 2 ; - Figure 3 is a partial sectional view of the lower part of the stamping tool of Figures 1 and 2;
- la figure 4 est une vue de l'outillage d'emboutissage de la figure 1 en position de fermeture ; - Figure 4 is a view of the stamping tool of Figure 1 in the closed position;
- la figure 5 est une vue de dessus du serre-flan de l'outillage d'emboutissage et dont la portée de serre-flan présente une surface de serrage homogène du flan ; FIG. 5 is a view from above of the blank holder of the stamping tool and whose blank holder surface has a uniform clamping surface of the blank;
- la figure 6 est une vue semblable à celle de la figure 5 et représentant une zone de décalage de la portée du serre-flan n'assurant pas une homogénéité de serrage du flan ; - la figure 7 est une vue en perspective du serre-flan conforme à l'invention ; et - Figure 6 is a view similar to that of Figure 5 and showing a range of the range of the blank holder does not ensure uniformity clamping of the blank; FIG. 7 is a perspective view of the blank holder according to the invention; and
- la figure 8 est une vue agrandie de la partie cerclée en VIII de la figure 7. FIG. 8 is an enlarged view of the portion circled at VIII of FIG. 7.
[0014] En se reportant aux figures, la référence 1 désigne un outillage de presse, plus particulièrement un outillage d'emboutissage de tôles, notamment de flans métalliques de relativement grandes dimensions utilisés dans l'industrie automobile. [0015] A titre d'exemple, la pièce emboutie formée à partir du flan embouti par l'outillage d'emboutissage 1 peut être constituée par un côté d'habitacle ou le pavillon d'un véhicule automobile. Referring to the figures, the reference numeral 1 denotes press tooling, more particularly sheet metal stamping tools, in particular metal blanks of relatively large size used in the automotive industry. For example, the stamped part formed from the blank stamped by the stamping tool 1 may be constituted by a side of the passenger compartment or the roof of a motor vehicle.
[0016] L'outillage d'emboutissage 1 comprend un socle ou bâti inférieur 2 fixé sur la surface supérieure d'une table de support 3 (appelée aussi PMR ou plateau mobile roulant) appartenant à la presse et d'une matrice 5 fixée sous le coulisseau 17 appartenant lui aussi à la presse. Le socle ou bâti inférieur 2 est constitué d'un poinçon 4 et un serre-flan 8 est verticalement mobile au-dessus du socle 2 comme on le verra ultérieurement. [0017] L'outillage d'emboutissage 1 est actionné en outre par un coussin hydraulique d'emboutissage 7 appartenant à la presse logé et sous la table de support 3. The stamping tool 1 comprises a base or lower frame 2 fixed on the upper surface of a support table 3 (also called PMR or moving mobile platform) belonging to the press and a matrix 5 fixed under the slider 17 also belonging to the press. The base or lower frame 2 consists of a punch 4 and a blank holder 8 is vertically movable above the base 2 as will be seen later. The stamping tool 1 is further actuated by a hydraulic stamping pad 7 belonging to the press housed and under the support table 3.
[0018] Le serre-flan 8 comprend une pluralité de colonnes verticales cylindriques 9 s'étendant en-dessous du serre-flan 8 à l'opposé de la portée 10 du serre-flan 8 destinée à enserrer avec la portée 1 1 de la matrice 5 le flan 6 lors de la phase d'emboutissage de ce flan. The blank holder 8 comprises a plurality of cylindrical vertical columns 9 extending below the blank holder 8 opposite the scope 10 of the blank holder 8 for clamping with the scope 1 1 of the matrix 5 the blank 6 during the stamping phase of this blank.
[0019] Les colonnes verticales 9 du serre-flan 8, qui traversent des perçages 14 du socle 2 et de la table de support 3, comprennent à leurs extrémités inférieures des bobéchons 12, qui sont amoviblement fixés aux extrémités inférieures de ces colonnes par vissage. [0020] L'outillage d'emboutissage 1 comprend également des tiges d'emboutissage verticales ou chandelles 13 traversant respectivement les perçages verticaux 14 et dont les extrémités inférieures sont en appui sur le coussin d'emboutissage 7. The vertical columns 9 of the blank holder 8, which pass through holes 14 of the base 2 and the support table 3, comprise at their lower ends bobbins 12, which are removably attached to the lower ends of these columns by screwing . The stamping tool 1 also comprises vertical stamping rods or candles 13 respectively passing through the vertical bores 14 and whose lower ends rest on the stamping pad 7.
[0021 ] Les colonnes verticales 9 du serre-flan 8 sont en appui par leurs bobéchons 12 respectivement sur les extrémités supérieures des tiges d'emboutissage verticales 13. [0022] L'outillage d'emboutissage 1 comprend de plus un bâti supérieur 15 comprenant deux montants parallèles 16 en appui sur la table 3 et qui comportent le coulisseau 17 apte à se déplacer verticalement comme symbolisé par la double flèche F en figure 2 sous l'action de vérins hydrauliques 18, le coulisseau 17 supportant la matrice 5. Ainsi, la matrice 5 peut se déplacer verticalement vers le serre-flan 8. Ce dernier est verticalement guidé relativement au socle 2 par ses coins en contact glissant dans des coins en équerre 2a du socle 2. The vertical columns 9 of the blank holder 8 are supported by their bobbins 12 respectively on the upper ends of the vertical stamping rods 13. The stamping tool 1 further comprises an upper frame 15 comprising two parallel uprights 16 resting on the table 3 and which comprise the slider 17 adapted to move vertically as symbolized by the double arrow F in Figure 2 under the action of hydraulic cylinders 18, the slide 17 supporting the matrix 5. Thus, the die 5 can move vertically towards the blank holder 8. The latter is vertically guided relative to the base 2 by its corners in sliding contact in square corners 2a of the base 2.
[0023] Lorsque la matrice 5 descend verticalement sous l'action des vérins de commande 18, le flan 6 est enserré entre les portées 10, 1 1 respectivement du serre-flan 8 et de la matrice 5 et le serre-flan 8 descend verticalement dans le socle 2 avec les colonnes cylindriques verticales 9, en appui par leurs bobéchons 12 sur les extrémités supérieures des tiges verticales d'emboutissage 13, s'engageant respectivement dans les perçages 14 du socle 2 jusqu'à la position de fermeture de l'outil d'emboutissage représentée en figure 4 pour emboutir le flan 6 et réaliser la pièce emboutie souhaitée. When the die 5 descends vertically under the action of the control jacks 18, the blank 6 is sandwiched between the bearing surfaces 10, 11 respectively of the blank holder 8 and the die 5 and the blank holder 8 descends vertically. in the base 2 with the vertical cylindrical columns 9, supported by their bores 12 on the upper ends of the vertical drawing rods 13, respectively engaging in the bores 14 of the base 2 to the closed position of the stamping tool shown in Figure 4 to stamp the blank 6 and make the desired stamped part.
[0024] Pendant le mouvement de descente verticale du serre-flan 8, le coussin hydraulique 7 exerce un effort vertical vers le haut par l'intermédiaire des tiges 13, des bobéchons 12 et des colonnes cylindriques 9 pour exercer l'effort de serrage du flan 6 par la portée 10 du serre-flan 8. [0025] La figure 5 représente la portée 10 du serre-flanc 8 dont toute la surface est homogène, c'est-à-dire qu'elle assure un serrage homogène du flan 6 entre la portée 10 et la portée 1 1 de la matrice 5 pour assurer une bonne régulation de l'alimentation du flan de tôle. [0026] La figure 6 représente la situation selon laquelle la portée 10 du serre-flan 8 est correcte, c'est-à-dire homogène sur une grande partie de sa surface, mais présente une partie de surface décalée relativement à la portée correcte comme symbolisé en 10a et qui n'assure pas un serrage homogène du flan entre les deux portées 10 du serre-flan 8 et 1 1 de la matrice 5, c'est-à-dire que la portée 10 du serre-flan 8 n'entrera pas totalement en contact avec le flan sous la portée 1 1 de la matrice 5. During the vertical descent movement of the blank holder 8, the hydraulic cushion 7 exerts a vertical force upwardly via the rods 13, bobbins 12 and cylindrical columns 9 to exert the clamping force of the blank 6 by the span 10 of the blank holder 8. FIG. 5 represents the bearing surface 10 of the flank clamp 8, the entire surface of which is homogeneous, that is to say that it ensures a uniform tightening of the blank 6 between the bearing surface 10 and the bearing surface 1 1 of the matrix 5 to ensure a good regulation of the supply of the sheet blank. FIG. 6 represents the situation in which the span of the blank holder 8 is correct, that is to say homogeneous over a large part of its surface, but has a portion of surface that is offset relative to the correct range. as symbolized at 10a and which does not ensure a uniform clamping of the blank between the two bearing surfaces 10 of the blank holder 8 and 1 1 of the die 5, that is to say that the span 10 of the blank holder 8 n will not come into full contact with the blank under the scope 1 1 of the die 5.
[0027] Pour remédier à ce problème, l'invention propose d'insérer entre les bobéchons 12 et les extrémités inférieures des colonnes cylindriques 9 du serre-flan 8 respectivement des clinquants 19 pour les colonnes cylindriques 9 situées en vis-à-vis de la zone 10a en écart avec la surface restante homogène de la portée 10 du serre-flan 8. [0028] Ainsi, lorsque le serre-flan 8 descend verticalement suite au mouvement de descente verticale de la matrice 5, le coussin hydraulique va exercer sur les colonnes cylindriques 9 du serre-flan 8 un effort vertical vers le haut déformant ou vrillant élastiquement le serre-flan 8 de manière que la portée 10 de celui-ci assure un serrage homogène du flan 6 entre la portée 10 du serre-flan 8 et la portée 1 1 de la matrice 5 et ce grâce à la présence des clinquants 19. To remedy this problem, the invention proposes to insert between the bobbins 12 and the lower ends of the cylindrical columns 9 of the blank holder 8 respectively foils 19 for cylindrical columns 9 located vis-à-vis the zone 10a spaced apart from the homogeneous remaining surface of the span 10 of the blank holder 8. Thus, when the blank holder 8 descends vertically following the vertical downward movement of the die 5, the hydraulic cushion will exert on the cylindrical columns 9 of the blank holder 8 a vertical upward force deforming or elastically screwing the blank holder 8 so that the bearing 10 thereof ensures a uniform clamping of the blank 6 between the bearing surface 10 of the blank holder 8 and the scope 1 1 of the matrix 5 and this thanks to the presence of foils 19.
[0029] Les clinquants 19 se présentent dans le cas présent sous forme d'anneaux serrés entre les extrémités inférieures des colonnes cylindriques 9 et les bobéchons correspondants 12 vissés dans ces extrémités. The foils 19 are in this case in the form of tight rings between the lower ends of the cylindrical columns 9 and the corresponding bobbers 12 screwed into these ends.
[0030] Les épaisseurs des clinquants 19 dépendent de la grandeur de décalage entre la portée 10a et la portée restante homogène 10 du serre-flan 8 suivant chaque presse hydraulique utilisée d'un même modèle et d'une même marque. The thicknesses of the foils 19 depend on the amount of offset between the range 10a and the remaining homogeneous range 10 of the blank holder 8 according to each hydraulic press used of the same model and the same mark.
[0031 ] A titre d'exemple, l'épaisseur de chaque clinquant 19 peut varier entre 1/10 mm à 1 mm en fonction des presses utilisées. By way of example, the thickness of each foil 19 can vary between 1/10 mm to 1 mm depending on the presses used.
[0032] Bien entendu, le serre-flan 8 est réalisé en un matériau lui permettant de se déformer élastiquement de manière à pouvoir l'utiliser sur une autre presse du même type que la précédente. [0033] L'invention consiste donc à réaliser une déformation du serre-flan 8 par calage des bobéchons ou entretoises 12 avec des clinquants 19 de manière à adapter la portée 10 du serre-flan à la presse de fabrication et ainsi retrouver un serrage identique à la presse de mise au point. On évite de la sorte les opérations de meulage et de pierrage réalisées antérieurement sur les presses de fabrication. Of course, the blank holder 8 is made of a material allowing it to deform elastically so as to use it on another press of the same type as the previous one. The invention therefore consists in producing a deformation of the blank holder 8 by wedging the bobechons or spacers 12 with foils 19 so as to adapt the span 10 of the blank holder to the manufacturing press and thus find an identical clamping to the press of focus. This avoids the grinding and honing operations previously carried out on the manufacturing presses.
[0034] L'invention a ainsi pour avantage un gain de temps pour l'adaptation sous presse de fabrication et ne nécessite pas de meulage, ni de pierrage sur la ligne de fabrication et, par conséquent, ne produit pas de pollution liée à ces interventions de meulage et de pierrage, d'où des pièces embouties de meilleure qualité. [0035] En outre, le temps passé sur la ligne de fabrication est moins important, diminuant par conséquent les coûts de fabrication. The invention thus has the advantage of saving time for adaptation to a production press and does not require grinding or honing on the production line and, consequently, does not produce any pollution associated with these products. grinding and honing operations, resulting in better quality stamped parts. In addition, the time spent on the production line is less important, therefore decreasing manufacturing costs.

Claims

REVENDICATIONS
1 . Outillage d'emboutissage d'un flan (6) pour la formation d'une pièce emboutie, notamment d'un véhicule automobile, comprenant un socle inférieur (2) fixé sur une table de support (3) et comportant un poinçon (4), un coussin d'emboutissage (7) logé sous le la table de support (3), un serre-flan (8) situé au-dessus du socle (2) et comportant des colonnes verticales (9) à extrémités inférieures comportant des bobéchons (12) en appui respectivement sur des extrémités supérieures de tiges d'emboutissage verticales (13) traversant des perçages (14) du socle (2) et de la table de support (3) et dont les extrémités inférieures sont en appui sur le coussin d'emboutissage (7), un coulisseau (17) supportant une matrice (5) apte à se déplacer verticalement vers le serre-flan (8), ce dernier et la matrice (5) comportant respectivement deux portées (10,1 1 ) entre lesquelles peut être enserré le flan (6), les tiges d'emboutissage (13) étant aptes à transmettre l'effort de serrage du coussin d'emboutissage (7) à la portée (10) du serre- flan (8), caractérisé en ce que les colonnes verticales (9) du serre-flan (8) sont aptes à comporter chacune entre son extrémité et le bobéchon correspondant (12) au moins un clinquant (19) permettant une déformation élastique du serre-flan (8) par le coussin d'emboutissage (7) et les tiges d'emboutissage (13) pour assurer un serrage homogène du flan (6) sur toute la portée du serre-flan (8). 1. Tool for stamping a blank (6) for the formation of a stamped part, in particular of a motor vehicle, comprising a lower base (2) fixed on a support table (3) and comprising a punch (4) , a stamping pad (7) housed under the support table (3), a blank holder (8) located above the base (2) and having vertical columns (9) with lower ends comprising bobbins (12) bearing respectively on upper ends of vertical stamping rods (13) passing through bores (14) of the base (2) and of the support table (3) and whose lower ends rest on the cushion stamping device (7), a slider (17) supporting a matrix (5) able to move vertically towards the blank holder (8), the latter and the matrix (5) respectively comprising two spans (10, 1 1) between which can be clamped the blank (6), the stamping rods (13) being able to transmit the effort of s wandering of the stamping pad (7) to the reach (10) of the blank holder (8), characterized in that the vertical columns (9) of the blank holder (8) are able to comprise each between its end and the corresponding bobechon (12) at least one foil (19) allowing an elastic deformation of the blank holder (8) by the stamping pad (7) and the stamping rods (13) to ensure uniform clamping of the blank (6) ) over the entire span of the blank holder (8).
2. Outillage d'emboutissage selon la revendication 1 , caractérisé en ce que chaque bobéchon (12) est amoviblement fixé par vissage à l'extrémité de la colonne verticale correspondante (9) du serre-flan (8) et le clinquant (19) peut être fixé par serrage entre le bobéchon (12) et l'extrémité de la colonne verticale (9) du serre-flan (8). 2. Stamping tool according to claim 1, characterized in that each bobechon (12) is removably fixed by screwing to the end of the corresponding vertical column (9) of the blank holder (8) and the foil (19) can be clamped between the bobechon (12) and the end of the vertical column (9) of the blank holder (8).
3. Outillage d'emboutissage selon la revendication 1 ou 2, caractérisé en ce que l'épaisseur du clinquant (19) est comprise entre 1/10 mm et 1 mm en fonction de l'outillage d'emboutissage utilisé. 3. Stamping tool according to claim 1 or 2, characterized in that the thickness of the foil (19) is between 1/10 mm and 1 mm depending on the stamping tool used.
4. Outillage d'emboutissage selon l'une des revendications 1 à 3, caractérisé en ce que les colonnes verticales (9) comportant les clinquants (19) sont situées en vis-à-vis d'une zone de la portée (10) du serre-flan (8) présentant un écart de surface relativement à la surface restante homogène de la portée (10). 4. Stamping tool according to one of claims 1 to 3, characterized in that the vertical columns (9) comprising the foils (19) are located opposite a range area (10) blank holder (8) having a surface gap relative to the remaining homogeneous surface of the bearing surface (10).
EP17794004.6A 2016-11-14 2017-10-12 Press tooling for sheet metal of relatively large dimensions, notably for motor vehicles Active EP3538292B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1660949A FR3058656B1 (en) 2016-11-14 2016-11-14 TOOLING FOR THE SOLDERING OF RELATIVELY LARGE SIZES PARTICULARLY FOR MOTOR VEHICLES
PCT/FR2017/052806 WO2018087441A1 (en) 2016-11-14 2017-10-12 Press tooling for sheet metal of relatively large dimensions, notably for motor vehicles

Publications (2)

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EP3538292A1 true EP3538292A1 (en) 2019-09-18
EP3538292B1 EP3538292B1 (en) 2020-12-09

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EP (1) EP3538292B1 (en)
ES (1) ES2857681T3 (en)
FR (1) FR3058656B1 (en)
WO (1) WO2018087441A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112808864B (en) * 2020-12-21 2023-04-07 中铁隆昌铁路器材有限公司 Forming tool die of elastic clamp for track turnout

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007033943B4 (en) * 2007-07-19 2018-05-17 August Läpple GmbH & Co. KG Device for forming workpieces
FR3008330B1 (en) * 2013-07-15 2016-01-01 Peugeot Citroen Automobiles Sa PRESS TOOLS SUITABLE FOR FITTING LARGE PIECES
FR3018709B1 (en) * 2014-03-20 2016-03-25 Peugeot Citroen Automobiles Sa TOOLING FOR BONDING FOR CONFORMING A BENT PIECE

Also Published As

Publication number Publication date
FR3058656A1 (en) 2018-05-18
EP3538292B1 (en) 2020-12-09
FR3058656B1 (en) 2018-11-23
WO2018087441A1 (en) 2018-05-17
ES2857681T3 (en) 2021-09-29

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