EP3297777B1 - Shaping of half-open metal stamped part - Google Patents

Shaping of half-open metal stamped part Download PDF

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Publication number
EP3297777B1
EP3297777B1 EP16729309.1A EP16729309A EP3297777B1 EP 3297777 B1 EP3297777 B1 EP 3297777B1 EP 16729309 A EP16729309 A EP 16729309A EP 3297777 B1 EP3297777 B1 EP 3297777B1
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EP
European Patent Office
Prior art keywords
blank
punch
die
tab
sheet
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EP16729309.1A
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German (de)
French (fr)
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EP3297777A1 (en
Inventor
Ludovic VALLON
Jean Luc BRUN
François PREVOST
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 date
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Publication of EP3297777A1 publication Critical patent/EP3297777A1/en
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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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • 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
    • 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
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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 invention relates to the field of stamping, more precisely the shaping of a part, in particular of a bodywork or vehicle structure, by stamping a sheet metal blank.
  • tooling comprising a die
  • a punch and blank holders is usually used.
  • the blank holders are mounted laterally with the punch and sliding against elastic forces produced by the springs.
  • the die in the lower position, comprises lateral portions cooperating with the blank holders in order to clamp the edges of the sheet metal blank placed on the die. This clamping takes place during the downward movement of the punch towards the die, as soon as the blank holders contact the edges of the sheet metal blank, pressing them against the lateral portions of the die, against the elastic forces of the springs.
  • the punch contacts the central portion of the sheet metal blank, the latter is deformed towards the die. The sheet then undergoes warping deformations generating tensile forces which can cause the sheet to slide along the blank holders.
  • the purpose of the blank holders is to retain the sheet blank and, therefore, to generate elongation deformations of the sheet in order to avoid the formation of corrugations. Indeed, depending on the shape given to the stamping, the swallowing of sheet metal during shaping can cause compressive forces by excess of material, which can cause undulations. This is particularly the case when the stamping has a generally conical shape.
  • the document FR 3 012 055 describes a tool and a stamping process of this type.
  • the retention of the sheet blank by the blank holders can sometimes lead to excessive extension deformations leading to excessively small thicknesses, or even to ruptures.
  • the invention according to independent claims 1 and 5 aims to overcome at least one of the drawbacks of the state of the art, in this case of the aforementioned state of the art. More particularly, the object of the invention is to propose a solution for the shaping of open stampings.
  • the subject of the invention is a method for forming a part by stamping a sheet blank, comprising the following steps: (a) placing the sheet blank on a forming tool by stamping comprising a die and a punch capable of cooperating by engagement with the die; (b) mutual bringing together of the die and the punch in a direction of work, with a view to forming the part; in step (a), the sheet metal blank comprising at least one tab with at least one edge, and in step (b), the or each of the tabs being folded between the die and the punch and ensures retention of the sheet metal blank, the sheet metal blank being generally elongated in a longitudinal direction, the or each of the edges comprising the tab (s) being at one end, in said direction, of the sheet metal blank, the tool comprising at least one blank holder disposed laterally to one of the punch and the die and capable of clamping the sheet blank with the other of the punch and the die, the blank holder (s) being mounted to slide against an elastic force , in step (b), the or
  • the or each of the edges comprising the tab (s) forms a final edge of the part.
  • the tab (s) leave the blank holder (s) before the end of step (b).
  • the goal is for the leg (s) to be of minimum size. It is therefore useful for the blank holder (s) to interact with the leg (s) only at the start of step (b).
  • the tab (s) can leave the blank holder (s) at the latest at the halfway point for forming the sheet metal blank by the die and the punch in step (b).
  • the tab (s) are folded in the direction of work of the die and of the punch.
  • the or each of the legs comprises a bent portion forming a radius of curvature of between 1 and 10mm, preferably between 2 and 8mm.
  • the measures of the invention are advantageous in that they make it possible to produce stamped parts while saving material while controlling the shaping by adequate retention of the sheet during said shaping.
  • the figure 1 is a plan view of a sheet metal blank 2 intended to be shaped by stamping with a tool and according to a method in accordance with the invention.
  • the sheet metal blank 2 comprises a central portion 2 1 with several edges or sides. It also includes a tab 2 2 on one of its edges.
  • tab is meant a portion of sheet, integrally formed with the central portion, projecting from an edge of the central portion. It is thus a projecting portion, preferably generally flat with the central portion. Given that the portion is protruding, it has a width less than that of the edge from which it originates.
  • the sheet blank 2 extends in a longitudinal direction, and the tab 2 2 is located on an edge or side corresponding to one end of said blank along its longitudinal axis.
  • the figure 2 illustrates the principle of the stamping tool according to the invention and used to carry out the stamping process according to the invention.
  • the tooling comprises a die 4, a punch 8 and one or more blank holder 6.
  • the latter or the latter are mounted to slide along the periphery of the punch 8, against elastic forces generated by springs, not shown.
  • the sheet metal blank 2 is deposited on the blank holders 6 while the tool is in the open position.
  • the blank holders 6 are in the high position, that is to say more higher than that of the punch, and the sheet metal blank can be placed on the blank holders 6.
  • the figure 3 illustrates the situation where the die 4 has started its downward movement towards the punch 8 and where its end portions 4 1 and 4 2 are in contact with the sheet blank 2.
  • the enlarged portion of the figure 3 shows that the tab 2 2 of the sheet metal blank 2 is clamped between the portion 4 1 of the die 4 and the blank holder 6.
  • the figure 4 illustrates the process of shaping the figure 3 at a later stage, where the die 4 has moved closer to the punch 8 at a point where the contact face of the portion 4 1 of the die is aligned with the contact face facing the punch 8, to the thickness of the sheet metal.
  • the blank holder 6 therefore began its descent against the elastic forces of its springs.
  • the figure 5 illustrates a step in the figure 3 and 4 , at a later stage than that of the figure 4 , namely that the downward movement of the die 4 has the effect of bending the tab 2 2 downwards, in the space provided between the faces of the punch and of the die which are opposite (visible at the enlarged area of the figure 3 ).
  • the tab 2 2 thus folded then forms a brake for resurfacing the sheet metal blank for the remainder of the forming process.
  • the tab 2 2 forms a bent portion whose sliding along the corresponding edge of the punch generates a retaining force, in the manner of the blank holder. It is however understood that at the stage of figure 5 , depending on the length of the tab 2 2 , the blank holder 6 no longer has or almost no grip on said tab.
  • the radius of curvature R of the edge of the punch 8 forming the bent portion of the tab 2 2 is between 1 and 10mm, advantageously between 2 and 8mm. Such values provide an interesting resistance force in that it is sufficient without blocking the sliding of the tab.
  • the figure 6 illustrates a final or near-final stage of the shaping process of figures 3 to 5 .
  • the tab 2 2 is deformed by sliding along the contact surface of the punch following the tensile forces generated by the deformation of the central portion 2 1 generated by the coming together of the die 4 and the punch 8.
  • the figure 7 illustrates in perspective the shape that the sheet metal blank 2 gradually takes, essentially at the four stages of the forming process illustrated in figures 3 to 6 , respectively.
  • the representation in the upper position corresponds to the stage of figure 3 and the representation in the lower position corresponds to part 10 after stamping.
  • the part 10, in this case is a spar part. This piece is generally elongated. It can be observed that the left end of the part, in its longitudinal direction, is open, namely that the corresponding edge 10 1 of the sheet blank thus formed must not undergo a cutting step (trimming). It can also be observed that the right-hand end of the part, still in its longitudinal direction, is semi-open, namely that it has a partially final edge 10 2.
  • the tab 2 2 is present on this edge 10 2 but occupies a small space and does not necessarily have to be cut. It can be sized so as not to interfere with the assembly of the part during its assembly.
  • the longitudinal edges 10 3 and 10 4 for their part comprise portions intended to be cut. Indeed, these portions served to retain the sheet transversely to its main direction during its shaping, which made it possible to ensure satisfactory shaping.
  • the deformation applied to the sheet in this direction is indeed large in comparison with the deformations in the longitudinal direction.

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

Description

L'invention a trait au domaine de l'emboutissage, plus précisément de la mise à forme d'une pièce, notamment de carrosserie ou de structure de véhicule, par emboutissage d'un flan de tôle.The invention relates to the field of stamping, more precisely the shaping of a part, in particular of a bodywork or vehicle structure, by stamping a sheet metal blank.

Lors de l'emboutissage d'un flan de tôle, un outillage comprenant une matrice, un poinçon et des serre-flan, est habituellement utilisé. Les serre-flan sont montés latéralement au poinçon et coulissant contre des efforts élastiques produits par des ressorts. La matrice, en position inférieure, comprend des portions latérales coopérant avec les serre-flan en vue de serrer les bords du flan de tôle posé sur la matrice. Ce serrage a lieu lors du mouvement de descente du poinçon vers la matrice, dès que les serre-flan contactent les bords du flan de tôle, les pressant contre les portions latérales de la matrice, contre les efforts élastiques des ressorts. Lorsque le poinçon contacte la portion centrale du flan de tôle, celle-ci se voit déformée vers la matrice. La tôle subit alors des déformations de gauchissement générant des efforts de traction pouvant provoquer le glissement de la tôle le long des serre-flan. Les serre-flan ont pour objectif de retenir le flan de tôle et, partant, de générer des déformations en allongement de la tôle afin d'éviter la formation d'ondulations. En effet, en fonction de la forme donnée à l'embouti, l'avalement de tôle lors de la mise à forme peut provoquer des efforts de compression par excès de matière, pouvant provoquer des ondulations. C'est notamment le cas lorsque l'embouti présente une forme généralement conique.When stamping a sheet metal blank, tooling comprising a die, a punch and blank holders is usually used. The blank holders are mounted laterally with the punch and sliding against elastic forces produced by the springs. The die, in the lower position, comprises lateral portions cooperating with the blank holders in order to clamp the edges of the sheet metal blank placed on the die. This clamping takes place during the downward movement of the punch towards the die, as soon as the blank holders contact the edges of the sheet metal blank, pressing them against the lateral portions of the die, against the elastic forces of the springs. When the punch contacts the central portion of the sheet metal blank, the latter is deformed towards the die. The sheet then undergoes warping deformations generating tensile forces which can cause the sheet to slide along the blank holders. The purpose of the blank holders is to retain the sheet blank and, therefore, to generate elongation deformations of the sheet in order to avoid the formation of corrugations. Indeed, depending on the shape given to the stamping, the swallowing of sheet metal during shaping can cause compressive forces by excess of material, which can cause undulations. This is particularly the case when the stamping has a generally conical shape.

Le document FR 3 012 055 décrit un outillage et un procédé d'emboutissage de ce type.The document FR 3 012 055 describes a tool and a stamping process of this type.

En fonction de la forme de l'embouti, la retenue du flan de tôle par les serre-flan peut parfois conduire à des déformations en extension excessives conduisant à des épaisseurs trop réduites, voire à des ruptures.Depending on the shape of the stamping, the retention of the sheet blank by the blank holders can sometimes lead to excessive extension deformations leading to excessively small thicknesses, or even to ruptures.

Une fois le flan de tôle mis à forme par l'emboutissage décrit ci-avant, les bords de l'embouti ayant été retenus par les serre-flan doivent être découpés. Cette opération est communément appelée opération de détourage. Elle implique par conséquent, outre une opération supplémentaire, une perte de matière non négligeable.Once the sheet metal blank has been shaped by the stamping described above, the edges of the stamping which have been retained by the blank holders must be cut. This operation is commonly referred to as a clipping operation. It therefore implies, in addition to an additional operation, a significant loss of material.

Afin de limiter les problèmes de rupture et/ou de perte de matière, on peut être amené à ne pas prévoir de flan de tôle sur un ou plusieurs côtés de l'embouti. Il s'agit d'emboutis ouverts sur un ou plusieurs côtés. Il n'y a donc pas de serrage et pas de retenue de la tôle lors de l'emboutissage. La pièce ainsi réalisée, même si des problèmes de ruptures ou d'épaisseur réduite et de perte de matière sont résolus, se voit moins tendue lors de son emboutissage et est par conséquent susceptible de présenter des défauts d'ondulations.In order to limit the problems of rupture and / or loss of material, it may be necessary not to provide a sheet blank on one or more sides of the stamping. It's about stampings open on one or more sides. There is therefore no clamping and no retention of the sheet during stamping. The part thus produced, even if the problems of breaks or of reduced thickness and of loss of material are solved, is seen less stretched during its stamping and is therefore liable to exhibit corrugation defects.

L'invention selon les revendications indépendantes 1 et 5 a pour objectif de pallier au moins un des inconvénients de l'état de la technique, en l'occurrence de l'état de la technique susmentionné. Plus particulièrement, l'invention a pour objectif de proposer une solution pour la mise à forme d'embouti ouverts.The invention according to independent claims 1 and 5 aims to overcome at least one of the drawbacks of the state of the art, in this case of the aforementioned state of the art. More particularly, the object of the invention is to propose a solution for the shaping of open stampings.

L'invention a pour objet un procédé de mise à forme d'une pièce par emboutissage d'un flan de tôle, comprenant les étapes suivantes:(a) mise en place du flan de tôle sur un outillage de mise à forme par emboutissage comprenant une matrice et un poinçon apte à coopérer par engagement avec la matrice; (b) rapprochement mutuel de la matrice et du poinçon suivant une direction de travail, en vue de former la pièce; à l'étape (a), le flan de tôle comprenant au moins une patte à au moins un bord, et à l'étape (b), la ou chacune des pattes étant pliée entre la matrice et le poinçon et assure une retenue du flan de tôle, le flan de tôle étant généralement allongé suivant une direction longitudinale, le ou chacun des bords comprenant la ou les pattes étant à une extrémité, suivant ladite direction, du flan de tôle, l'outillage comprenant au moins un serre-flan disposé latéralement à l'un du poinçon et de la matrice et apte à serrer le flan de tôle avec l'autre du poinçon et de la matrice, le ou les serre-flan étant monté(s) coulissant(s) contre un effort élastique, à l'étape (b), le ou au moins un des serre-flan serrant les bords longitudinaux du flan de tôle allongé, caractérisé en ce qu'à l'étape (b), le ou au moins un des serre-flan serre la ou les pattes avant qu'elle(s) soi(en)t pliée(s) entre la matrice et le poinçon.The subject of the invention is a method for forming a part by stamping a sheet blank, comprising the following steps: (a) placing the sheet blank on a forming tool by stamping comprising a die and a punch capable of cooperating by engagement with the die; (b) mutual bringing together of the die and the punch in a direction of work, with a view to forming the part; in step (a), the sheet metal blank comprising at least one tab with at least one edge, and in step (b), the or each of the tabs being folded between the die and the punch and ensures retention of the sheet metal blank, the sheet metal blank being generally elongated in a longitudinal direction, the or each of the edges comprising the tab (s) being at one end, in said direction, of the sheet metal blank, the tool comprising at least one blank holder disposed laterally to one of the punch and the die and capable of clamping the sheet blank with the other of the punch and the die, the blank holder (s) being mounted to slide against an elastic force , in step (b), the or at least one of the blank holders clamping the longitudinal edges of the elongated sheet metal blank, characterized in that in step (b), the or at least one of the blank holders clamps the leg (s) before it (s) are bent (s) between the die and the punch.

Selon un mode avantageux de l'invention, le ou chacun des bords comprenant la ou les pattes forme un bord final de la pièce.According to an advantageous embodiment of the invention, the or each of the edges comprising the tab (s) forms a final edge of the part.

Avantageusement, la ou les pattes quittent le ou les serre-flan avant la fin de l'étape (b). L'objectif est que le ou les pattes soient de taille minimale. Il est donc utile que le ou les serre-flan interagissent avec la ou les pattes uniquement au début de l'étape (b). Par exemple, la ou les pattes peuvent quitter le ou les serre-flan au plus tard à la mi-course de mise à forme du flan de tôle par la matrice et le poinçon à l'étape (b).Advantageously, the tab (s) leave the blank holder (s) before the end of step (b). The goal is for the leg (s) to be of minimum size. It is therefore useful for the blank holder (s) to interact with the leg (s) only at the start of step (b). For example, the tab (s) can leave the blank holder (s) at the latest at the halfway point for forming the sheet metal blank by the die and the punch in step (b).

Selon un mode avantageux de l'invention, à la fin de l'étape (b), la ou les pattes sont pliées suivant la direction de travail de la matrice et du poinçon.According to an advantageous embodiment of the invention, at the end of step (b), the tab (s) are folded in the direction of work of the die and of the punch.

Selon un mode avantageux de l'invention, à la fin de l'étape (b), la ou chacun des pattes comprend une portion coudée formant un rayon de courbure compris entre 1 et 10mm, préférentiellement entre 2 et 8mm.According to an advantageous embodiment of the invention, at the end of step (b), the or each of the legs comprises a bent portion forming a radius of curvature of between 1 and 10mm, preferably between 2 and 8mm.

L'invention a également pour objet un outillage pour la mise à forme d'une pièce par emboutissage d'un flan de tôle selon le procédé de l'invention, l'outillage comprenant :

  • une matrice; - un poinçon apte à coopérer avec la matrice par engagement dans ladite matrice; le poinçon comportant une arête sur un de ces bords s'engageant dans la matrice de sorte à plier la ou les pattes entre la matrice et le poinçon et former la partie coudée de la patte, l'outillage comprenant en outre au moins un serre-flan disposé latéralement au poinçon et apte à serrer le flan de tôle avec au moins une portion latérale la matrice, le ou les serre-flan étant montés coulissants le long de la périphérie du poinçon contre un effort élastique, caractérisé en ce que le rayon de courbure de l'arête du poinçon formant la portion coudée de la patte est compris entre 1 et 10mm, avantageusement entre 2 et 8mm, afin d'assurer une retenue du flan de tôle lors de la mise en forme de la pièce.
A subject of the invention is also a tool for shaping a part by stamping a sheet blank according to the method of the invention, the tool comprising:
  • a matrix; a punch capable of cooperating with the die by engagement in said die; the punch comprising an edge on one of these edges engaging in the die so as to bend the tab (s) between the die and the punch and form the bent part of the tab, the tool further comprising at least one clamp blank arranged laterally to the punch and capable of clamping the sheet blank with at least one lateral portion of the die, the blank holder (s) being mounted to slide along the periphery of the punch against an elastic force, characterized in that the radius of curvature of the edge of the punch forming the bent portion of the tab is between 1 and 10mm, advantageously between 2 and 8mm, in order to ensure retention of the sheet blank during the shaping of the part.

Les mesures de l'invention sont intéressantes en ce qu'elles permettent de réaliser des pièces embouties en économisant de la matière tout en maîtrisant la mise à forme par une retenue adéquate de la tôle durant ladite mise à forme.The measures of the invention are advantageous in that they make it possible to produce stamped parts while saving material while controlling the shaping by adequate retention of the sheet during said shaping.

D'autres caractéristiques et avantages de la présente invention seront mieux compris à l'aide de la description et des dessins parmi lesquels :

  • La figure 1 illustre un flan de tôle destiné à être embouti par un procédé conforme à l'invention ;
  • La figure 2 illustre le principe de l'outillage et du procédé de mise à forme selon l'invention ;
  • La figure 3 est une vue schématique en coupe de l'outillage et du flan de tôle selon une première étape du procédé selon l'invention ;
  • La figure 4 correspond à la figure 3 à une étape ultérieure du procédé selon l'invention ;
  • La figure 5 correspond aux figures 3 et 4 à une étape ultérieure à celle de la figure 4 ;
  • La figure 6 correspond aux figures 3 à 5, à une étape finale du procédé selon l'invention ;
  • La figure 7 illustre en perspective la forme de la pièce formée successivement aux étapes des figures 3 à 6.
Other characteristics and advantages of the present invention will be better understood with the aid of the description and the drawings, among which:
  • The figure 1 illustrates a sheet metal blank intended to be stamped by a method in accordance with the invention;
  • The figure 2 illustrates the principle of the tooling and of the forming method according to the invention;
  • The figure 3 is a schematic sectional view of the tooling and of the sheet metal blank according to a first step of the method according to the invention;
  • The figure 4 corresponds to the figure 3 at a subsequent step of the method according to the invention;
  • The figure 5 corresponds to figures 3 and 4 at a later stage than that of the figure 4 ;
  • The figure 6 corresponds to figures 3 to 5 , at a final step of the process according to the invention;
  • The figure 7 illustrates in perspective the shape of the part formed successively at the stages of figures 3 to 6 .

La figure 1 est une vue en plan d'un flan de tôle 2 destiné à être mise à forme par emboutissage avec un outillage et selon un procédé conformes à l'invention. Le flan de tôle 2 comprend une portion centrale 21 avec plusieurs bords ou côtés. Il comprend également une patte 22 sur un de ses bords. Par patte, on entend une portion de tôle, intégralement formée avec la portion centrale, faisant saillie d'un bord de la portion centrale. Il s'agit ainsi d'une portion en saillie, préférentiellement généralement plane avec la portion centrale. Compte tenu que la portion est en saillie, elle présente une largeur inférieure à celle du bord dont elle est issue.The figure 1 is a plan view of a sheet metal blank 2 intended to be shaped by stamping with a tool and according to a method in accordance with the invention. The sheet metal blank 2 comprises a central portion 2 1 with several edges or sides. It also includes a tab 2 2 on one of its edges. By tab is meant a portion of sheet, integrally formed with the central portion, projecting from an edge of the central portion. It is thus a projecting portion, preferably generally flat with the central portion. Given that the portion is protruding, it has a width less than that of the edge from which it originates.

Avantageusement, le flan de tôle 2 s'étend suivant une direction longitudinale, et la patte 22 est située sur un bord ou côté correspondant à une extrémité dudit flan suivant son axe longitudinal.Advantageously, the sheet blank 2 extends in a longitudinal direction, and the tab 2 2 is located on an edge or side corresponding to one end of said blank along its longitudinal axis.

Pour des raisons de simplicité et de clarté d'exposé, une seule patte est illustrée et va être décrite plus en détail, étant toutefois entendu qu'il est envisageable de prévoir plusieurs pattes, sur un même bord ou sur des bords différents.For reasons of simplicity and clarity of presentation, a single tab is illustrated and will be described in more detail, it being understood, however, that it is possible to envisage providing several tabs, on the same edge or on different edges.

La figure 2 illustre le principe de l'outillage d'emboutissage conforme à l'invention et utilisé pour réaliser le procédé d'emboutissage conforme à l'invention. L'outillage comprend une matrice 4, un poinçon 8 et un ou plusieurs serre-flan 6. Ce dernier ou ces derniers sont montés coulissants le long de la périphérie du poinçon 8, contre des efforts élastiques générés par des ressorts non représentés.The figure 2 illustrates the principle of the stamping tool according to the invention and used to carry out the stamping process according to the invention. The tooling comprises a die 4, a punch 8 and one or more blank holder 6. The latter or the latter are mounted to slide along the periphery of the punch 8, against elastic forces generated by springs, not shown.

L'outillage et le procédé vont être décrits en détail en relation avec les figures 3 à 6 illustrant les étapes successives d'emboutissage de la pièce.The tooling and method will be described in detail in connection with the figures 3 to 6 illustrating the successive stages of stamping the part.

A la figure 3, on peut observer le profil de la matrice 4 dont les portions d'extrémités 41 et 42 entrent en contact avec le flan de tôle 2. Plus précisément, le flan de tôle 2, éventuellement préformé, est déposé sur les serre-flan 6 alors que l'outillage est en position ouverte. Les serre-flan 6 sont en position haute, c'est-à-dire plus supérieure à celle du poinçon, et le flan de tôle peut être déposé sur les serre-flan 6. La figure 3 illustre la situation où la matrice 4 a entamé son mouvement de descente vers le poinçon 8 et où ses portions d'extrémités 41 et 42 sont en contact avec le flan de tôle 2. La portion agrandie de la figure 3 montre que la patte 22 du flan de tôle 2 est serrée entre la portion 41 de la matrice 4 et le serre-flan 6.To the figure 3 , one can observe the profile of the die 4 whose end portions 4 1 and 4 2 come into contact with the sheet metal blank 2. More precisely, the sheet metal blank 2, possibly preformed, is deposited on the blank holders 6 while the tool is in the open position. The blank holders 6 are in the high position, that is to say more higher than that of the punch, and the sheet metal blank can be placed on the blank holders 6. The figure 3 illustrates the situation where the die 4 has started its downward movement towards the punch 8 and where its end portions 4 1 and 4 2 are in contact with the sheet blank 2. The enlarged portion of the figure 3 shows that the tab 2 2 of the sheet metal blank 2 is clamped between the portion 4 1 of the die 4 and the blank holder 6.

La figure 4 illustre le procédé de mise à forme de la figure 3 à une étape ultérieure, où la matrice 4 s'est davantage rapprochée du poinçon 8 à un point où la face de contact de la portion 41 de la matrice est alignée avec la face de contact en vis-à-vis du poinçon 8, à l'épaisseur de la tôle près. Le serre-flan 6 a par conséquent entamé sa descente contre les efforts élastiques de ses ressorts.The figure 4 illustrates the process of shaping the figure 3 at a later stage, where the die 4 has moved closer to the punch 8 at a point where the contact face of the portion 4 1 of the die is aligned with the contact face facing the punch 8, to the thickness of the sheet metal. The blank holder 6 therefore began its descent against the elastic forces of its springs.

La figure 5 illustre une étape du procédé des figure 3 et 4, à une étape ultérieure à celle de la figure 4, à savoir que le mouvement de descente de la matrice 4 a pour effet de plier la patte 22 vers le bas, dans l'espace prévu entre les faces du poinçon et de la matrice qui sont en vis-à-vis (visibles à la zone agrandie de la figure 3). La patte 22 ainsi pliée forme alors un frein pour ravalement du flan de tôle pour le reste du processus de mise à forme. En effet, la patte 22 forme une portion coudée dont le glissement le long de l'arête correspondante du poinçon génère un effort de retenue, à la manière du serre-flan. Il est toutefois entendu qu'au stade de la figure 5, en fonction de la longueur de la patte 22, le serre-flan 6 n'a plus ou presque plus d'emprise sur ladite patte.The figure 5 illustrates a step in the figure 3 and 4 , at a later stage than that of the figure 4 , namely that the downward movement of the die 4 has the effect of bending the tab 2 2 downwards, in the space provided between the faces of the punch and of the die which are opposite (visible at the enlarged area of the figure 3 ). The tab 2 2 thus folded then forms a brake for resurfacing the sheet metal blank for the remainder of the forming process. Indeed, the tab 2 2 forms a bent portion whose sliding along the corresponding edge of the punch generates a retaining force, in the manner of the blank holder. It is however understood that at the stage of figure 5 , depending on the length of the tab 2 2 , the blank holder 6 no longer has or almost no grip on said tab.

Le rayon de courbure R de l'arête du poinçon 8 formant la portion coudée de la patte 22 est compris entre 1 et 10mm, avantageusement entre 2 et 8mm. De telles valeurs procurent un effort résistant intéressant en ce qu'il est suffisant sans pour autant bloquer le glissement de la patte.The radius of curvature R of the edge of the punch 8 forming the bent portion of the tab 2 2 is between 1 and 10mm, advantageously between 2 and 8mm. Such values provide an interesting resistance force in that it is sufficient without blocking the sliding of the tab.

La figure 6 illustre un stade final ou quasi-final du procédé de mise à forme des figures 3 à 5. La patte 22 s'est déformée par glissement le long de la surface de contact du poinçon suite aux efforts de traction générés par la déformation de la portion centrale 21 engendrée par le rapprochement de la matrice 4 et du poinçon 8.The figure 6 illustrates a final or near-final stage of the shaping process of figures 3 to 5 . The tab 2 2 is deformed by sliding along the contact surface of the punch following the tensile forces generated by the deformation of the central portion 2 1 generated by the coming together of the die 4 and the punch 8.

Il est à noter que bien que cela ne soit pas représenté aux figures 3 à 6, les bords longitudinaux du flan de tôle sont sujets à serrage par le ou les serre-flan.It should be noted that although this is not represented in the figures 3 to 6 , the longitudinal edges of the sheet metal blank are subject to clamping by the blank holder (s).

La figure 7 illustre en perspective la forme que prend progressivement le flan de tôle 2 essentiellement aux quatre stades du procédé de mise à forme illustrés aux figures 3 à 6, respectivement. La représentation en position supérieure correspond au stade de la figure 3 et la représentation en position inférieur correspond à la pièce 10 après emboutissage. On peut constater que la pièce 10, en l'occurrence, est une pièce de longeron. Cette pièce est généralement allongée. On peut observer que l'extrémité gauche de la pièce, suivant sa direction longitudinale, est ouverte, à savoir que le bord correspondant 101 du flan de tôle ainsi formé ne doit pas subir d'étape de découpage (détourage). On peut également observer que l'extrémité de droite de la pièce, toujours suivant sa direction longitudinale, est semi-ouverte, à savoir qu'elle présente un bord 102 partiellement final. La patte 22 est présente sur ce bord 102 mais occupe une place réduite et ne doit pas nécessairement être découpée. Elle peut être dimensionnée pour ne pas gêner l'assemblage de la pièce lors de son montage. Les bords longitudinaux 103 et 104 quant à eux comprennent des portions destinées à être découpées. En effet, ces portions ont servi à retenir la tôle transversalement à sa direction principale lors de sa mise à forme, ce qui a permis d'assurer une mise à forme satisfaisante. La déformation appliquée à la tôle dans cette direction est en effet important en comparaison avec les déformations dans la direction longitudinale.The figure 7 illustrates in perspective the shape that the sheet metal blank 2 gradually takes, essentially at the four stages of the forming process illustrated in figures 3 to 6 , respectively. The representation in the upper position corresponds to the stage of figure 3 and the representation in the lower position corresponds to part 10 after stamping. It can be seen that the part 10, in this case, is a spar part. This piece is generally elongated. It can be observed that the left end of the part, in its longitudinal direction, is open, namely that the corresponding edge 10 1 of the sheet blank thus formed must not undergo a cutting step (trimming). It can also be observed that the right-hand end of the part, still in its longitudinal direction, is semi-open, namely that it has a partially final edge 10 2. The tab 2 2 is present on this edge 10 2 but occupies a small space and does not necessarily have to be cut. It can be sized so as not to interfere with the assembly of the part during its assembly. The longitudinal edges 10 3 and 10 4 for their part comprise portions intended to be cut. Indeed, these portions served to retain the sheet transversely to its main direction during its shaping, which made it possible to ensure satisfactory shaping. The deformation applied to the sheet in this direction is indeed large in comparison with the deformations in the longitudinal direction.

Claims (5)

  1. A method of forming a workpiece (10) by stamping a sheet metal blank (2), comprising the following steps:
    (a) placing the sheet metal blank (2) on a stamping forming tool comprising a die (4) and a punch (8) capable of engaging with the die (4);
    (b) the die (4) and the punch (8) are brought together in a working direction to form the workpiece (10);
    in step (a), the sheet blank (2) comprising at least one tab (22) with at least one edge, and in step (b), the or each of the tabs (22) being bent between the die (4) and the punch (8) and holding the sheet blank, the sheet blank (2) being generally elongated in a longitudinal direction, the or each of the edges comprising the tab or tabs being at one end, in said direction, of the sheet blank (2), the tooling comprising at least one blank clamp (6) disposed laterally at the edge One of the punch (8) and of the die (4) and capable of clamping the sheet blank (2) with the other of the punch (8) and of the die (4), the blank clamp or clamps (6) being slidably mounted against an elastic force, in step (b), the or at least one of the blank clamps (6) clamping the longitudinal edges of the elongated sheet blank (2), characterized in that in step (b), the or at least one of the blank clamps (6) clamps the front tab or tabs (22) It is folded between the die (4) and the punch (8).
  2. Method according to Claim 1, characterized in that the or each of the edges comprising the tab or tabs forms a final edge (102) of the part (10).
  3. Method according to one of Claims 1 and 2, characterized in that at the end of step (b) the lug or lugs (22) are bent in the working direction of the die (4) and the punch (8).
  4. Method according to one of Claims 1 to 3, characterized in that at the end of step (b), the or each of the tabs (22) comprises an angled portion forming a radius of curvature R of between 1 and 10 mm, preferably between 2 and 8 mm.
  5. Tool for forming a workpiece (10) by stamping a sheet metal blank (2) according to the method of one of claims 1 to 4, the tool comprising:
    - a matrix (4);
    - a punch (8) adapted to cooperate with the die (4) by engagement in said die (4); the punch (8) having an edge on one of these edges engaging in the die (4) so as to bend the tab or tabs (22) between the die (4) and the punch (8) and form the bent part of the tab (22),
    the tool further comprising at least one blank holder (6) arranged laterally to the punch (8) and capable of clamping the sheet metal blank (2) with at least one lateral portion (41) of the die (4), the blank holder(s) (6) being slidably mounted along the periphery of the punch against an elastic force, characterized in that the radius of curvature (R) of the edge of the punch (8) forming the bent portion of the tab (22) is between 1 and 10 mm, advantageously between 2 and 8 mm, in order to ensure retention of the blank of sheet metal (2) when shaping the part (10)
EP16729309.1A 2015-05-18 2016-04-13 Shaping of half-open metal stamped part Active EP3297777B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1554433A FR3036299B1 (en) 2015-05-18 2015-05-18 SEMI-OPEN EMBROIDERING
PCT/FR2016/050857 WO2016185105A1 (en) 2015-05-18 2016-04-13 Shaping of half-open metal stamped part

Publications (2)

Publication Number Publication Date
EP3297777A1 EP3297777A1 (en) 2018-03-28
EP3297777B1 true EP3297777B1 (en) 2021-11-24

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EP16729309.1A Active EP3297777B1 (en) 2015-05-18 2016-04-13 Shaping of half-open metal stamped part

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EP (1) EP3297777B1 (en)
CN (1) CN107666974B (en)
ES (1) ES2901145T3 (en)
FR (1) FR3036299B1 (en)
WO (1) WO2016185105A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018205350A1 (en) * 2018-04-10 2019-10-10 Bayerische Motoren Werke Aktiengesellschaft Forming tool and method for producing an edge on a component and method for producing such a forming tool
CN111922171B (en) * 2020-06-30 2021-10-08 成都飞机工业（集团）有限责任公司 Sheet metal forming method for multi-deep-cavity airplane thin-wall part

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
JPS59111233A (en) * 1982-12-16 1984-06-27 Toshiba Corp Apparatus for forming shadow mask for color cathode ray tube
ES277870Y (en) * 1984-03-03 1985-12-01 Perez Marti Juan HEAD TO GRAPH
US6006564A (en) * 1998-12-10 1999-12-28 Honda Of America Mfg., Inc. Application of dry lubricant to forming dies and forging dies that operate with high force
DE102009005261A1 (en) * 2009-01-20 2010-07-22 Bayerische Motoren Werke Aktiengesellschaft Process for producing a complex sheet metal part
FR3010921B1 (en) * 2013-09-24 2016-02-19 Peugeot Citroen Automobiles Sa BINDING TOOL FOR RETRIEVING A FOLDED PIECE HAVING A FALLED EDGE
FR3012055B1 (en) * 2013-10-23 2015-11-20 Peugeot Citroen Automobiles Sa PIECE FITTING WITH FASTENING LEG (S)
CN104841761B (en) * 2015-04-24 2016-10-05 福州大学 A kind of alloy sheets electromagnetism piercing and flanging manufacturing process and device

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Also Published As

Publication number Publication date
FR3036299B1 (en) 2017-05-19
ES2901145T3 (en) 2022-03-21
CN107666974A (en) 2018-02-06
WO2016185105A1 (en) 2016-11-24
EP3297777A1 (en) 2018-03-28
FR3036299A1 (en) 2016-11-25
CN107666974B (en) 2020-04-14

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