EP3297777A1 - Shaping of half-open metal stamped part - Google Patents

Shaping of half-open metal stamped part

Info

Publication number
EP3297777A1
EP3297777A1 EP16729309.1A EP16729309A EP3297777A1 EP 3297777 A1 EP3297777 A1 EP 3297777A1 EP 16729309 A EP16729309 A EP 16729309A EP 3297777 A1 EP3297777 A1 EP 3297777A1
Authority
EP
European Patent Office
Prior art keywords
punch
die
blank
sheet blank
sheet
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
EP16729309.1A
Other languages
German (de)
French (fr)
Other versions
EP3297777B1 (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
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 EP3297777A1 publication Critical patent/EP3297777A1/en
Application granted granted Critical
Publication of EP3297777B1 publication Critical patent/EP3297777B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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 specifically to the forming of a part, in particular of bodywork or vehicle structure, by stamping a sheet blank.
  • a punch and blanks When stamping a sheet blank, tooling comprising a die, a punch and blanks is usually used.
  • the blanks are mounted laterally to the punch and sliding against elastic forces produced by springs.
  • the matrix in the lower position, comprises lateral portions cooperating with the blank holders in order to clamp the edges of the sheet blank placed on the die. This clamping takes place during the descent movement of the punch to the die, as soon as the blanks contact the edges of the sheet 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 blank, it is deformed towards the die. The sheet then undergoes warping deformations generating tensile forces that can cause the sliding of the sheet along the blanks.
  • the purpose of the blanks is to retain the blank of sheet metal and thereby generate deformations in elongation of the sheet to prevent the formation of undulations. Indeed, depending on the shape given to the stamping, swallowing sheet metal during the shaping can cause compressive forces by excess material, which can cause ripples. This is particularly the case when the stamping has a generally conical shape.
  • the retention of the sheet blank by the blanks can sometimes lead to excessive extension deformations leading to too small thicknesses, or even breaks.
  • the invention aims to overcome at least one of the drawbacks of the state of the art, in this case of the state of the art mentioned above. More particularly, the object of the invention is to propose a solution for forming open stampings.
  • the subject of the invention is a process for shaping a workpiece by stamping a sheet blank, comprising the following steps: (a) placing the sheet blank on a drawing forming tool comprising: a matrix and a punch adapted to cooperate by engagement with the matrix; (b) bringing the die and the punch together in a direction of work to form the workpiece; remarkable in that in step (a), the sheet blank comprises at least one tab with at least one edge, and in step (b), the or each of the tabs is folded between the die and the punch and ensures retention of the sheet blank.
  • the or each edge comprising the one or more tabs forms a final edge of the part.
  • the sheet blank is generally elongated in a longitudinal direction, the or each edge comprising the tab or tabs being at one end, in said direction, of the sheet blank.
  • the tooling comprises at least one blank holder disposed laterally to one of the punch and the die and able to clamp the sheet blank with the other of the punch and the die, the blanks being slidably mounted against an elastic force.
  • step (b) the or at least one of the blanks clamps the longitudinal edges of the elongated sheet blank.
  • the or at least one of the blanks clamps the leg or legs before it (s) is (b) folded (s) between the matrix and the punch.
  • the leg or legs leave the blanks or blank before the end of step (b).
  • the objective is that the leg or legs are of minimum size. It is therefore useful for the blank holder (s) to interact with the leg (s) only at the beginning of step (b).
  • the one or more lugs may leave the blank holder (s) at the latest at the mid-race for forming the sheet blank by the die and the punch in step (b).
  • the tab or tabs are folded in the working direction of the die and the punch.
  • the or each of the tabs comprises a bent portion forming a radius of curvature of between 1 and 10 mm, preferably between 2 and 8 mm.
  • the invention also relates to a tool for forming a workpiece by stamping a sheet blank according to the method of the invention, the tooling comprising: a die; a punch adapted to cooperate with the matrix by engagement in said matrix; and remarkable in that the die and the punch are configured to be able to bend the tab or tabs between the die and the punch, to ensure retention of the sheet blank during the forming of the piece.
  • the tooling comprises at least one blank holder disposed laterally to the punch and able to clamp the sheet blank with at least one lateral portion of the die, the blank holder (s) being slidably mounted. against an elastic force.
  • the lateral portion or portions of the matrix form one or more folding blades of the one or more lugs, respectively.
  • the measures of the invention are interesting in that they make it possible to produce stamped parts by saving material while controlling the shaping by an adequate retention of the sheet during said shaping.
  • FIG. 1 illustrates a sheet blank to be stamped by a method according to the invention
  • FIG. 2 illustrates the principle of the tooling and the forming method according to the invention
  • - Figure 3 is a schematic sectional view of the tool and the sheet blank according to a first step of the method according to the invention
  • FIG. 4 corresponds to FIG. 3 at a later stage of the process according to the invention
  • FIG. 5 corresponds to FIGS. 3 and 4 at a stage subsequent to that of FIG. 4;
  • FIG. 6 corresponds to FIGS. 3 to 5, at a final stage of the process according to the invention
  • Figure 7 illustrates in perspective the shape of the part formed successively to the steps of Figures 3 to 6.
  • Figure 1 is a plan view of a blank sheet 2 to be formed by stamping with a tool and according to a method according to the invention.
  • the sheet blank 2 comprises a central portion 21 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 protruding portion, preferably generally flat with the central portion. Given that the portion is projecting, it has a width less than that of the edge from which it is derived.
  • the sheet blank 2 extends in a longitudinal direction, and the tab 2 2 is located on an edge or side corresponding to an end of said blank along its longitudinal axis.
  • FIG. 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 blanks 6. The latter or the latter are slidably mounted along the periphery of the punch 8, against elastic forces generated by unrepresented springs.
  • the tooling and the process will be described in detail in connection with FIGS. 3 to 6 illustrating the successive steps of stamping the workpiece.
  • FIG. 3 the profile of the die 4, whose end portions 4 1 and 4 2 come into contact with the sheet blank 2, can be observed. More specifically, the sheet blank 2, possibly preformed, is deposited on the blanks 6 while the tool is in the open position. The blanks 6 are in the upper position, that is to say greater than that of the punch, and the sheet blank can be deposited on the blanks 6.
  • Figure 3 illustrates the situation where the matrix 4 has initiated 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 Figure 3 shows that the tab 2 2 of the sheet blank 2 is clamped between the portion 4 1 of the die 4 and the blank holder 6.
  • FIG. 4 illustrates the shape setting method of Figure 3 at a later stage, wherein the matrix 4 is more closer to the punch 8 to a point where the contact face 4 of the portion 1 of the matrix is aligned with the contact face vis-à-vis the punch 8, the thickness of the sheet close.
  • the blank holder 6 has therefore begun its descent against the elastic forces of its springs.
  • FIG. 5 illustrates a step of the method of FIGS. 3 and 4, at a step subsequent to that of FIG. 4, namely that the downward movement of the die 4 has the effect of folding the tab 2 2 downwards, in the space provided between the faces of the punch and the die which are vis-à-vis (visible to the enlarged area of Figure 3).
  • the tab 2 2 thus folded then forms a brake for swallowing the sheet blank for the rest 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.
  • the blank holder 6 has more or almost no longer on said leg.
  • the radius of curvature R of the edge of the punch 8 forming the bent portion of the lug 2 2 may be between 1 and 10 mm, preferably between 2 and 8 mm. Such values provide an interesting resisting force in that it is sufficient without blocking the slippage of the tab.
  • FIG. 6 illustrates a final or near-final stage of the shaping process of FIGS. 3 to 5. The tab 2 2 has been deformed by sliding along the contact surface of the punch as a result of the traction forces generated by the deformation of the central portion 2 1 generated by the approximation of the die 4 and the punch 8.
  • FIG. 7 illustrates in perspective the shape that the sheet blank progressively takes
  • the representation in the upper position corresponds to the stage of FIG. 3 and the representation in the lower position corresponds to the part 10 after stamping.
  • the piece 10 in this case, is a spar piece. This piece is usually elongated. It can be seen 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 should not undergo a cutting step (clipping). It can also be observed that the right end of the piece, always 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 place and does not necessarily have to be cut.
  • the longitudinal edges 10 3 and 10 4 in turn comprise portions intended to be cut. Indeed, these portions were used to retain the sheet transversely to its main direction during its shaping, which allowed to ensure satisfactory formatting.
  • the deformation applied to the sheet in this direction is indeed important in comparison with the deformations in the longitudinal direction.

Landscapes

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

Abstract

The invention relates to a method for shaping a part by stamping a sheet metal blank (2). Said method includes the following steps: (a) placing the sheet metal blank (2) onto equipment for shaping by stamping, said equipment including a die (4) and a punch (8) that is capable of engaging with the die (4) via insertion therein, and (b) bringing the die (4) and the punch (8) nearer to each other in a working direction, with a view to forming the part. In step (a), the sheet metal blank (2) includes at least one tab (22) at least at one edge, and in step (b), the or each tab (22) is folded between the die (4) and the punch (8) and ensures the sheet metal blank (2) is held. The invention also relates to the equipment (4, 6, 8) for carrying out the method in question.

Description

MISE A FORME D'EMBOUTI SEMI-OUVERT  SEMI-OPEN EMBROIDERING
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 specifically to the forming of a part, in particular of bodywork or vehicle structure, by stamping a sheet 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, 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 blank, tooling comprising a die, a punch and blanks is usually used. The blanks are mounted laterally to the punch and sliding against elastic forces produced by springs. The matrix, in the lower position, comprises lateral portions cooperating with the blank holders in order to clamp the edges of the sheet blank placed on the die. This clamping takes place during the descent movement of the punch to the die, as soon as the blanks contact the edges of the sheet 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 blank, it is deformed towards the die. The sheet then undergoes warping deformations generating tensile forces that can cause the sliding of the sheet along the blanks. The purpose of the blanks is to retain the blank of sheet metal and thereby generate deformations in elongation of the sheet to prevent the formation of undulations. Indeed, depending on the shape given to the stamping, swallowing sheet metal during the shaping can cause compressive forces by excess material, which can cause ripples. This is particularly the case when the stamping has a generally conical shape.
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 blanks can sometimes lead to excessive extension deformations leading to too small thicknesses, or even breaks.
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 blank shaped by the stamping described above, the edges of the stamped having been retained by the blanks must be cut. This operation is commonly known 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 blank sheet on one or more sides of the stamping. It is embossed open on one or more sides. So there is no clamping and no retention of the sheet during stamping. The part thus produced, even if problems of breakage or reduced thickness and loss of material are solved, is less tight during its stamping and is therefore likely to have ripple defects.
L'invention 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 aims to overcome at least one of the drawbacks of the state of the art, in this case of the state of the art mentioned above. More particularly, the object of the invention is to propose a solution for forming 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 ; remarquable en ce qu'à l'étape (a), le flan de tôle comprend au moins une patte à au moins un bord, et à l'étape (b), la ou chacune des pattes est pliée entre la matrice et le poinçon et assure une retenue du flan de tôle. The subject of the invention is a process for shaping a workpiece by stamping a sheet blank, comprising the following steps: (a) placing the sheet blank on a drawing forming tool comprising: a matrix and a punch adapted to cooperate by engagement with the matrix; (b) bringing the die and the punch together in a direction of work to form the workpiece; remarkable in that in step (a), the sheet blank comprises at least one tab with at least one edge, and in step (b), the or each of the tabs is folded between the die and the punch and ensures retention of the sheet blank.
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 edge comprising the one or more tabs forms a final edge of the part.
Selon un mode avantageux de l'invention, le flan de tôle est 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. According to an advantageous embodiment of the invention, the sheet blank is generally elongated in a longitudinal direction, the or each edge comprising the tab or tabs being at one end, in said direction, of the sheet blank.
Selon un mode avantageux de l'invention, l'outillage comprend 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 montés coulissants contre un effort élastique. According to an advantageous embodiment of the invention, the tooling comprises at least one blank holder disposed laterally to one of the punch and the die and able to clamp the sheet blank with the other of the punch and the die, the blanks being slidably mounted against an elastic force.
Selon un mode avantageux de l'invention, à l'étape (b), le ou au moins un des serre- flan serre les bords longitudinaux du flan de tôle allongé. According to an advantageous embodiment of the invention, in step (b), the or at least one of the blanks clamps the longitudinal edges of the elongated sheet blank.
Selon un mode avantageux de l'invention, 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. 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). According to an advantageous embodiment of the invention, in step (b), the or at least one of the blanks clamps the leg or legs before it (s) is (b) folded (s) between the matrix and the punch. Advantageously, the leg or legs leave the blanks or blank before the end of step (b). The objective is that the leg or legs are of minimum size. It is therefore useful for the blank holder (s) to interact with the leg (s) only at the beginning of step (b). For example, the one or more lugs may leave the blank holder (s) at the latest at the mid-race for forming the sheet 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 or tabs are folded in the working direction of the die and 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 tabs comprises a bent portion forming a radius of curvature of between 1 and 10 mm, preferably between 2 and 8 mm.
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 ; et remarquable en ce que la matrice et le poinçon sont configurés pour pouvoir plier la ou les pattes entre la matrice et le poinçon, afin d'assurer une retenue du flan de tôle lors de la mise à forme de la pièce. The invention also relates to a tool for forming a workpiece by stamping a sheet blank according to the method of the invention, the tooling comprising: a die; a punch adapted to cooperate with the matrix by engagement in said matrix; and remarkable in that the die and the punch are configured to be able to bend the tab or tabs between the die and the punch, to ensure retention of the sheet blank during the forming of the piece.
Selon un mode avantageux de l'invention, l'outillage comprend au moins un serre- flan disposé latéralement au poinçon et apte à serrer le flan de tôle avec au moins une portion latérale de la matrice, le ou les serre-flan étant montés coulissants contre un effort élastique. La ou les portions latérales de la matrice forment une ou des lames de pliage de la ou des pattes, respectivement. According to an advantageous embodiment of the invention, the tooling comprises at least one blank holder disposed laterally to the punch and able to clamp the sheet blank with at least one lateral portion of the die, the blank holder (s) being slidably mounted. against an elastic force. The lateral portion or portions of the matrix form one or more folding blades of the one or more lugs, respectively.
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 interesting in that they make it possible to produce stamped parts by saving material while controlling the shaping by an 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 : Other features and advantages of the present invention will be better understood from the description and the drawings, among which:
- La figure 1 illustre un flan de tôle destiné à être embouti par un procédé conforme à l'invention ; - Figure 1 illustrates a sheet blank to be stamped by a method according to the 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 ; FIG. 2 illustrates the principle of the tooling and the forming method according to the invention; - Figure 3 is a schematic sectional view of the tool and the sheet blank according to a first step of the method according to the invention;
- La figure 4 correspond à la figure 3 à une étape ultérieure du procédé selon l'invention ; FIG. 4 corresponds to FIG. 3 at a later stage of the process according to the invention;
- La figure 5 correspond aux figures 3 et 4 à une étape ultérieure à celle de la figure 4 ; FIG. 5 corresponds to FIGS. 3 and 4 at a stage subsequent to that of FIG. 4;
- La figure 6 correspond aux figures 3 à 5, à une étape finale du procédé selon l'invention ; FIG. 6 corresponds to FIGS. 3 to 5, at a final stage of the process according to the invention;
- La figure 7 illustre en perspective la forme de la pièce formée successivement aux étapes des figures 3 à 6. - Figure 7 illustrates in perspective the shape of the part formed successively to the steps 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. Figure 1 is a plan view of a blank sheet 2 to be formed by stamping with a tool and according to a method according to the invention. The sheet blank 2 comprises a central portion 21 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 protruding portion, preferably generally flat with the central portion. Given that the portion is projecting, it has a width less than that of the edge from which it is derived.
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 an 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 the sake of simplicity and clarity of exposition, a single tab is illustrated and will be described in more detail, however, it is understood that it is conceivable to provide 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. 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. FIG. 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 blanks 6. The latter or the latter are slidably mounted along the periphery of the punch 8, against elastic forces generated by unrepresented springs. The tooling and the process will be described in detail in connection with FIGS. 3 to 6 illustrating the successive steps of stamping the workpiece.
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. In FIG. 3, the profile of the die 4, whose end portions 4 1 and 4 2 come into contact with the sheet blank 2, can be observed. More specifically, the sheet blank 2, possibly preformed, is deposited on the blanks 6 while the tool is in the open position. The blanks 6 are in the upper position, that is to say greater than that of the punch, and the sheet blank can be deposited on the blanks 6. Figure 3 illustrates the situation where the matrix 4 has initiated 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 Figure 3 shows that the tab 2 2 of the sheet 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. 4 illustrates the shape setting method of Figure 3 at a later stage, wherein the matrix 4 is more closer to the punch 8 to a point where the contact face 4 of the portion 1 of the matrix is aligned with the contact face vis-à-vis the punch 8, the thickness of the sheet close. The blank holder 6 has therefore begun 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 avalement 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. FIG. 5 illustrates a step of the method of FIGS. 3 and 4, at a step subsequent to that of FIG. 4, namely that the downward movement of the die 4 has the effect of folding the tab 2 2 downwards, in the space provided between the faces of the punch and the die which are vis-à-vis (visible to the enlarged area of Figure 3). The tab 2 2 thus folded then forms a brake for swallowing the sheet blank for the rest 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. However, it is understood that at the stage of Figure 5, depending on the length of the tab 2 2 , the blank holder 6 has more or almost no longer on said leg.
Le rayon de courbure R de l'arête du poinçon 8 formant la portion coudée de la patte 22 peut être 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. 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 radius of curvature R of the edge of the punch 8 forming the bent portion of the lug 2 2 may be between 1 and 10 mm, preferably between 2 and 8 mm. Such values provide an interesting resisting force in that it is sufficient without blocking the slippage of the tab. FIG. 6 illustrates a final or near-final stage of the shaping process of FIGS. 3 to 5. The tab 2 2 has been deformed by sliding along the contact surface of the punch as a result of the traction forces generated by the deformation of the central portion 2 1 generated by the approximation 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 shown in Figures 3 to 6, the longitudinal edges of the sheet blank are subject to tightening by the blanks or blanks.
La figure 7 illustre en perspective la forme que prend progressivement le flan de tôleFIG. 7 illustrates in perspective the shape that the sheet blank progressively takes
2 essentiellement aux quatre stades du procédé de mise à forme illustrés aux figures2 essentially at the four stages of the shaping process illustrated in the 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. 3 to 6, respectively. The representation in the upper position corresponds to the stage of FIG. 3 and the representation in the lower position corresponds to the part 10 after stamping. It can be seen that the piece 10, in this case, is a spar piece. This piece is usually elongated. It can be seen 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 should not undergo a cutting step (clipping). It can also be observed that the right end of the piece, always 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 place and does not necessarily have to be cut. It can be sized to not interfere with the assembly of the part during its assembly. The longitudinal edges 10 3 and 10 4 in turn comprise portions intended to be cut. Indeed, these portions were used to retain the sheet transversely to its main direction during its shaping, which allowed to ensure satisfactory formatting. The deformation applied to the sheet in this direction is indeed important in comparison with the deformations in the longitudinal direction.

Claims

REVENDICATIONS
1 . Procédé de mise à forme d'une pièce (10) par emboutissage d'un flan de tôle (2), comprenant les étapes suivantes : 1. Process for forming a workpiece (10) by stamping a sheet blank (2), comprising the following steps:
(a) mise en place du flan de tôle (2) sur un outillage de mise à forme par emboutissage comprenant une matrice (4) et un poinçon (8) apte à coopérer par engagement avec la matrice (4) ;  (a) placing the sheet blank (2) on a stamping forming tool comprising a die (4) and a punch (8) engageable by engagement with the die (4);
(b) rapprochement mutuel de la matrice (4) et du poinçon (8) suivant une direction de travail, en vue de former la pièce (10) ;  (b) bringing the die (4) and the punch (8) closer together in a direction of work to form the workpiece (10);
caractérisé en ce que  characterized in that
à l'étape (a), le flan de tôle (2) comprend au moins une patte (22) à au moins un bord, et à l'étape (b), la ou chacune des pattes (22) est pliée entre la matrice (4) et le poinçon (8) et assure une retenue du flan de tôle. in step (a), the sheet blank (2) comprises at least one tab (2 2 ) with at least one edge, and in step (b), the or each of the tabs (2 2 ) is folded between the die (4) and the punch (8) and ensures retention of the sheet blank.
2. Procédé selon la revendication 1 , caractérisé en ce que le ou chacun des bords comprenant la ou les pattes forme un bord final (102) de la pièce (10). 2. Method according to claim 1, characterized in that the or each of the edges comprising the or tabs forms a final edge (10 2 ) of the part (10).
3. Procédé selon l'une des revendications 1 et 2, caractérisé en ce que le flan de tôle (2) est 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 (2). 3. Method according to one of claims 1 and 2, characterized in that the sheet blank (2) is generally elongate in a longitudinal direction, the or each of the edges comprising the tab or lugs being at one end in said direction , blank sheet (2).
4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'outillage comprend au moins un serre-flan (6) disposé latéralement à l'un du poinçon (8) et de la matrice (4) et apte à serrer le flan de tôle (2) avec l'autre du poinçon (8) et de la matrice (4), le ou les serre-flan (6) étant monté(s) coulissant(s) contre un effort élastique. 4. Method according to one of claims 1 to 3, characterized in that the tool comprises at least one blank holder (6) disposed laterally to one of the punch (8) and the die (4) and suitable to clamp the sheet blank (2) with the other of the punch (8) and the die (4), the one or more blanks (6) being mounted (s) sliding (s) against an elastic force.
5. Procédé selon les revendications 3 et 4, caractérisé en ce qu'à l'étape (b), le ou au moins un des serre-flan (6) serre les bords longitudinaux du flan de tôle allongé (2). 5. Method according to claims 3 and 4, characterized in that in step (b), the or at least one of the blanks (6) clamps the longitudinal edges of the elongated sheet blank (2).
6. Procédé selon l'une des revendications 4 et 5, caractérisé en ce qu'à l'étape (b), le ou au moins un des serre-flan (6) serre la ou les pattes (22) avant qu'elle(s) soi(en)t pliée(s) entre la matrice (4) et le poinçon (8). 6. Method according to one of claims 4 and 5, characterized in that in step (b), the or at least one of the blanks (6) clamps or the tabs (2 2 ) before it (s) is (b) folded (s) between the matrix (4) and the punch (8).
7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'à la fin de l'étape (b), la ou les pattes (22) sont pliées suivant la direction de travail de la matrice (4) et du poinçon (8). 7. Method according to one of claims 1 to 6, characterized in that at the end of step (b), the lug (s) (2 2 ) are folded in the direction of work of the matrix (4) and the punch (8).
8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce qu'à la fin de l'étape (b), la ou chacun des pattes (22) comprend une portion coudée formant un rayon de courbure R compris entre 1 et 10mm, préférentiellement entre 2 et 8mm. 8. Method according to one of claims 1 to 7, characterized in that at the end of step (b), the or each of the tabs (2 2 ) comprises a bent portion forming a radius of curvature R between 1 and 10mm, preferably between 2 and 8mm.
9. Outillage pour la mise à forme d'une pièce (10) par emboutissage d'un flan de tôle (2) selon le procédé de l'une des revendications 1 à 8, l'outillage comprenant : 9. Tooling for forming a workpiece (10) by stamping a sheet blank (2) according to the method of one of claims 1 to 8, the tool comprising:
- une matrice (4) ;  a matrix (4);
- un poinçon (8) apte à coopérer avec la matrice (4) par engagement dans ladite matrice (4) ; et  - A punch (8) adapted to cooperate with the matrix (4) by engagement in said matrix (4); and
caractérisé en ce que  characterized in that
la matrice (4) et le poinçon (8) sont configurés pour pouvoir plier la ou les pattes (22) entre la matrice (4) et le poinçon (8), afin d'assurer une retenue du flan de tôle (2) lors de la mise à forme de la pièce (10). the die (4) and the punch (8) are configured to be able to fold the tab or tabs (2 2 ) between the die (4) and the punch (8), in order to ensure retention of the sheet blank (2) during the shaping of the workpiece (10).
10. Outillage selon la revendication 9, caractérisé en ce qu'il comprend au moins un serre-flan (6) disposé latéralement au poinçon (8) et apte à serrer le flan de tôle (2) avec au moins une portion latérale (41) la matrice (4), le ou les serre-flan (6) étant montés coulissants contre un effort élastique. 10. Tooling according to claim 9, characterized in that it comprises at least one blank holder (6) disposed laterally to the punch (8) and able to clamp the sheet blank (2) with at least one lateral portion (4). 1 ) the die (4), or the blanks (6) being slidably mounted against an elastic force.
EP16729309.1A 2015-05-18 2016-04-13 Shaping of half-open metal stamped part Active EP3297777B1 (en)

Applications Claiming Priority (2)

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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

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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

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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)
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FR3036299B1 (en) 2017-05-19
CN107666974A (en) 2018-02-06
EP3297777B1 (en) 2021-11-24
WO2016185105A1 (en) 2016-11-24
ES2901145T3 (en) 2022-03-21
CN107666974B (en) 2020-04-14

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