EP2822713B1 - Tool for press-forming and flanging the edges of a vehicle bonnet - Google Patents

Description

The invention relates to a tool for stamping and trimming the edges of a hood of a vehicle by means of a press, as described in the preamble of claim 1.

Such a tool is for example disclosed in the document JP-A-11244951 or in the document JP-A-57165128 .

Embossing is a shaping operation of a thin sheet which is commonly used in industry, particularly in the automotive industry to form including cladding panels, such as a hood of a motor vehicle.

Stamping is carried out in press by means of a stamping tool comprising a fixed punch serving as a support for the sheet, a movable die on which the sheet is stretched, and a flange for holding the sheet on the punch. .

The stamping operation is sometimes completed by at least one edge-cutting operation, which consists of reorienting the peripheral areas of the sheet which have been stamped and which are located in the extension of the main surfaces of the sheet.

The edge-dropping operation makes it possible, in particular, to fold an edge of the sheet undercut, so that the edge is folded in a direction inclined towards the punch, with respect to the direction of stamping, which is generally vertical, for prepare the crimping of the hood on a lining for example.

For this purpose, the punch defines at least one counterfoil which is designed to cooperate with an associated slider.

The slider is mounted movable relative to the punch, for example in a direction perpendicular to the drawing direction, between a retracted rest position and an advanced sloping direction, the slider being adapted to drive and fold the peripheral edge of the sheet metal. against the counterform associated with the punch.

The undercut edge has the disadvantage of being able to oppose the removal of the sheet on the punch and make the smoothing of the sheet difficult or impossible.

The document JP-2001347319 describes and represents a punch allowing the dishing of the sheet after an operation of dropping an edge undercut.

For this purpose, the punch comprises a counterfoil which is designed to cooperate with a slide, in order to fold an edge of the sheet undercut.

The counterfoil is mounted movably between a dropping position in which the counterfoil is adapted to cooperate with the associated slide, and a retracted position of dishing in which the counterfoil is retracted to allow the dishing of the sheet.

Although this punch allows the dishing of a sheet having an undercut edge, this punch is not designed for the dishing of a sheet having at least two peripheral edges, or three edges, against undercut which are contiguous and arranged generally at right angles, such as the peripheral edges of a hood of a vehicle.

In fact, the movement of withdrawal and retraction of two contiguous counter-forms implies a complex and delicate design of the punch.

Such a constraint requires the dropping of two edges consecutively undercut in two distinct casing operations on two separate tools.

However, the movement of the cover of a tool on another tool causes in particular bonnet positioning dispersions.

In particular to overcome this drawback, the invention proposes a tool for performing the dropping of the peripheral edges of a hood during the same dropping operation.

• une partie avant fixe délimitant une première contreforme avant transversale pour le tombage d'un premier bord avant du capot en contre-dépouille, une deuxième contreforme latérale longitudinale et une troisième contreforme latérale longitudinale pour le tombage d'un deuxième bord latéral et d'un troisième bord latéral du capot en contre-dépouille respectivement,
• une partie arrière qui s'étend transversalement à l'arrière de la partie avant et qui est montée mobile longitudinalement d'arrière en avant, depuis une position de travail dans laquelle la partie arrière et la partie avant du poinçon sont agencées de façon à former le capot, et une position de décoiffage dans laquelle la partie arrière est avancée vers la partie avant pour permettre de retirer le capot du poinçon.

For this purpose, the invention proposes a tool for stamping and dropping the edges of a hood of a vehicle by means of a press, of the type which is equipped with a punch for the shaping of the hood characterized in that the punch comprises:

• a fixed front portion delimiting a first transverse front counterfoil for dropping a first front edge of the undercut bonnet, a second longitudinal side counterfoil and a third longitudinal side counterfoil for dropping a second side edge and a third side edge of the undercut hood respectively,
• a rear part which extends transversely to the rear of the front part and which is mounted movable longitudinally from rear to front, from a working position in which the rear part and the front part of the punch are arranged so as to form the hood, and a position of dishing in which the rear part is advanced towards the front part to allow to remove the hood of the punch.

This feature reduces the size of the punch so that the counterfoils release the undercut edges of the cover, to allow removal of the cover.

In addition, the punch has a shape that is complementary to the shape of the hood and which is generally trapezoidal decreasing forward.

According to another characteristic, the rear portion of the punch comprises means for driving the cover which are designed to cooperate with the cover to drive the cover and the rear part simultaneously forwardly during the movement of the rear part towards the bonnet. his position of dishing.

This feature allows to disengage the hood from the punch by a translational movement of the cover to a thinner part of the punch.

Complementarily, the drive means of the cover comprise at least one drive finger which is arranged at the rear of the rear part of the punch and which is designed to cooperate with a fourth rear edge of the cover, to drive the cover on the move. forward.

In addition, the drive finger is movably mounted between a retracted position in which the fourth rear edge of the cover is adapted to be formed, and an extended position in which the finger is adapted to drive the cover moving forward.

In another aspect, the rear portion of the punch is delimited by a fourth transverse transverse counterfoil for the fall of the fourth rear edge of the hood.

Thus, the tool according to the invention allows the falling of the four peripheral edges of the cover, including three edges against undercut, during a single operation.

According to another characteristic, the second lateral counterfoil of the punch comprises a first movable section which extends longitudinally from a rear end of said second lateral counterfoil, and the third lateral counterform of the punch comprises a second movable section which extends longitudinally from a rear end of said third lateral counterfoil, each movable section being movably mounted on the tool between a working position in which each movable section is arranged of so as to form the cover, and a dishing position in which each movable section is retracted transversely to the inside of the punch to allow removal of the cover of the punch.

This feature allows to release directly the second side edge and the third side edge of the hood.

In addition, the rear portion of the punch, in its working position, is interposed transversely between the first movable portion of the second lateral counterfoil, and the second movable portion of the third lateral counterfoil.

Similarly, the rear portion of the punch, in its dishing position, is arranged above the first movable portion of the second lateral counterfoil and the second movable portion of the third lateral counterfoil.

Complementarily, the tool comprises falling means which are designed to cooperate with the first front counterfoil, the second side counterfoil and the third side counterform of the punch to form the first front edge of the hood, the second side edge and the third side edge undercut bonnet, respectively.

• la figure 1 est une vue schématique de dessus, qui illustre l'outil selon l'invention comportant un poinçon qui est coiffé d'un capot représenté en trait discontinu, et qui comporte une partie avant fixe et une partie arrière mobile représentée dans sa position de travail ;
• la figure 2 est une vue schématique de dessus similaire à la figure 1, qui illustre la partie arrière du poinçon représentée dans sa position de décoiffage ;
• la figure 3 est vue en section longitudinale, qui illustre l'outil selon l'invention et la partie arrière du poinçon dans sa position de travail ;
• la figure 4 est une vue en section longitudinale similaire à la figure 3, qui illustre la partie arrière du poinçon dans sa position de décoiffage ;
• la figure 5 est une vue de détail en perspective, qui illustre une deuxième contreforme latérale du poinçon qui comporte un premier tronçon mobile dans sa position de travail ;
• la figure 6 est une vue de détail en perspective, qui illustre la deuxième contreforme latérale de la figure 5, dont le premier tronçon mobile occupe sa position de décoiffage.

Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:

• the figure 1 is a schematic top view, which illustrates the tool according to the invention comprising a punch which is capped with a hood shown in broken lines, and which has a fixed front portion and a movable rear portion shown in its working position;
• the figure 2 is a schematic top view similar to the figure 1 , which illustrates the rear part of the punch represented in its position of dishing;
• the figure 3 is seen in longitudinal section, which illustrates the tool according to the invention and the rear part of the punch in its working position;
• the figure 4 is a longitudinal sectional view similar to the figure 3 , which illustrates the rear part of the punch in its position of dishing;
• the figure 5 is a perspective detail view, which illustrates a second lateral counterfoil of the punch which has a first movable section in its working position;
• the figure 6 is a detailed perspective view, which illustrates the second lateral counterpart of the figure 5 , whose first movable section occupies its position of dishing.

In the description and the claims, the terms "upper" and "lower" will be used in a nonlimiting manner with reference to the upper part and the lower part respectively of the Figures 3 and 4 .

Likewise, the terms "before" and "backward" will be used with reference to the upper part and the lower part respectively of the Figures 1 and 2 .

Moreover, to clarify the description and the claims, the longitudinal, vertical and transverse terminology will be adopted in a nonlimiting manner with reference to the L, V, T trihedron indicated in the figures.

We have shown figure 1 a tool 10 for stamping and tipping edges of a hood 12 of a vehicle, which is adapted to equip a press (not shown) stamping.

The tool 10 comprises a generally planar structure 14 which extends in a longitudinal and transverse plane, an upper die 16 (partially shown in FIG. figure 3 ), a lower punch 18 and a cover plate 12 shown in strongly broken line with Figures 1 and 2 .

As can be seen at figure 1 , the cover 12 and the punch 18 have a complementary overall trapezoidal shape decreasing towards the front.

The cover 12 is interposed vertically between the die 16 and the punch 18 in order to undergo a stamping operation and edge dropping.

For this purpose, the die 16 is driven in displacement by the press in a direction of vertical stamping from top to bottom, as can be seen in FIG. figure 3 .

Complementarily, the tool 10 comprises falling means 20 which are movably mounted at the periphery of the punch 18 and which are designed to cooperate with the peripheral edges of the cover 12.

As can be seen at figure 1 , the punch 18 has a symmetrical general design along a longitudinal plane P.

Also, to facilitate the understanding of the description, the symmetrical and identical elements are designated by the same reference numeral followed by the letter a or b.

With reference to the figure 1 the punch 18 has a fixed front portion 22 and a movable rear portion 24.

The front portion 22 delimits a first front transverse counterfoil for the dropping of a first front edge 28 of the undercut hood 12, a second longitudinal lateral counterfoil 30a and a third longitudinal lateral counterpart 30b for the dropping of a second edge. side 32a and a third side edge 32b of the cover 12 undercut respectively.

The first counterfoil before 26, the second lateral counterfoil 30a and the third lateral counterfoil 30b are designed to cooperate with the falling means 20 to fold the associated edges 28, 32a, 32b of the cover 12 undercut, that is to say say at an angle inclined towards the inside of punch 18, as can be seen partially in figure 3 .

With reference to Figures 1 and 2 , the second lateral counterpart 30a of the punch 18 comprises a first movable section 34a which extends longitudinally in the extension of a rear end of the second lateral counterpart 30a, in a flush manner.

By symmetry, the third lateral counterfoil 30b of the punch 18 comprises a second movable section 34b which extends longitudinally in the extension of a rear end of the third counterfoil 30b, in a flush manner.

The first movable section 34a and the second movable section 34b are each mounted on the tool 10, between a working position represented in FIG. figure 1 wherein each movable portion 34a, 34b is arranged to form the hood 12 by stamping and edge-dodging, and a hair-removal position shown in FIG. figure 2 , in which each movable section 34a, 34b is retracted transversely towards the inside of the punch 18 to enable the hood 12 to be removed or disheveled from the punch 18.

As can be seen at figure 6 , the first movable section 34a, in its dishing position, is arranged partly below the movable rear portion 24 of the punch 18.

In another aspect, the rear portion 24 of the punch 18 extends transversely to the rear of the front portion 22 of the punch 18.

The rear portion 24 of the punch 18 defines a fourth rear transverse counter 36 for the fall of a fourth rear edge 38 of the cover 12.

The fourth rear edge 38 of the cover 12 here comprises a central main section 40 which has a concave shape, a first return section 42a and a second return section 42b symmetrical along the plane P, which partially cooperate with the first movable section 34a. and the second movable section 34b respectively.

Without limitation, the first return section 42a and the second return section 42b of the fourth rear edge 38 of the cover 12 may be made by undercutting.

According to figure 3 , the fourth trailing edge 38 of the hood 12 is formed by dropping during the stamping operation, by means of the die 16, the fourth trailing edge 38 being folded in a vertical direction, without undercut.

The rear portion 24 of the punch 18 is mounted movably longitudinally from a working position shown in FIGS. figures 1 and 3 , in which the rear portion 24 and the front portion 22 of the punch 18 are arranged to form the hood 12, and a hair removal position shown in FIGS. figures 2 and 4 , in which the rear portion 24 is advanced towards the front portion 22 to allow removal or decoiffage of the cover 12 of the punch 18.

The rear portion 24 of the punch 18, in its working position, is interposed transversely between the first movable section 34a of the second lateral counterfoil 30a, and the second movable section 34b of the third lateral counterfoil 30b, as can be seen in FIG. figure 1 .

In addition, the rear portion 24 of the punch 18, in its dishing position, is arranged above the first movable section 34a of the second lateral counterfoil 30a, and the second movable section 34b of the third lateral counterfoil 30b, as can be seen in FIG. see to the figure 2 .

In a complementary manner, the rear portion 24 of the punch 18 comprises a first finger 44a and a second drive finger 44b forming drive means of the cover 12.

The drive fingers 44a, 44b are designed to cooperate with the rear edge 38 of the cover 12, to move the cover 12 and the rear portion 24 of the punch 18 simultaneously forwards during the displacement of the rear portion 24 towards his position of dishing.

Each finger 44a, 44b extends vertically from a bottom flange 46 of the rear portion 24 of the punch 18, movably, between a retracted position represented in figure 3 , and an unfolded position represented Figures 1, 2 and 4 .

In its retracted position, each finger 44a, 44b is retracted in a complementary housing of the sole 46 to allow the falling of the rear edge 38 of the cover 12.

In its deployed position, each finger 44a, 44b is arranged facing the rear counterform 36 of the rear portion 24 movable punch 18 to drive the cover 12 in forward displacement by sliding on the punch 18.

As can be seen at figures 2 and 4 following the displacement of the cover 12 and the rear portion 24 of the punch 18 towards the front, the edges 28, 32a, 32b of the cover 12 made by undercutting are released from the counterforms 26, 30a, 30b associated , so that no counterfoil opposes the removal of the hood 12 upwards.

Thus, the tool 10 according to the invention makes it possible to emboss and taper the edges 28, 32a, 32b, 38 peripherals of the cover 12 during a single operation.

For this purpose, the die 16 is driven in vertical displacement by means of a press for stamping the cover 12 and making the falling of the rear edge 38 of the cover 12.

Following the stamping, the falling means 20 are driven in displacement to achieve the dropping of the first front edge 28, the second side edge 32a and the third side edge 32b of the cover 12, against undercut.

The driving fingers 44a, 44b are driven from their retracted position to their deployed position.

Finally, the rear portion 24 of the punch 18 is driven in displacement from its working position, to its dishing position to allow the dishing of the hood 12, by means of a robotic arm for example.

According to an alternative embodiment not shown, the first finger 44a and the second finger 44b are fixedly mounted on the sole 46 of the rear portion 24 of the punch 18.

According to this variant, the fingers 44a, 44b and the rear counterform 36 of the rear portion 24 of the punch 18 delimit between them a space longitudinally designed to allow the tipping and folding of the rear edge 38 of the hood 12.

Claims (9)

1. A tool (10) for press-forming and flanging the edges of a vehicle bonnet (12) by means of a press, of the type which is equipped with a punch (18) for shaping the bonnet (12), the punch (18) having a shape which is complementary to the shape of the bonnet (12) and which is overall trapezoidal, decreasing towards the front, characterized in that the punch (18) comprises:

   - a fixed front part (22) delimiting a first transverse front die (26) for the flanging of a first front edge (28) of the bonnet (12) with an undercut, a second longitudinal lateral die (30a) and a third longitudinal lateral die (30b) for the flanging of a second lateral edge (32a) and of a third lateral edge (32b) of the bonnet (12) with an undercut respectively,

   - a rear part (24) which extends transversely at the rear of the front part (22) and which is mounted so as to move longitudinally from the back to the front, from a working position in which the rear part (24) and the front part (22) of the punch (18) are arranged so as to form the bonnet (12), and a decapping position, in which the rear part (24) is advanced towards the front part (22) to permit the bonnet (12) to be withdrawn from the punch (18), which allows the required space of the punch to be reduced such that the dies free the edges with undercut of the bonnet, to permit the withdrawal of the bonnet.
2. The tool (10) according to claim 1, characterized in that the rear part (24) of the punch (18) comprises driving means (44a, 44b) of the bonnet (12) which are designed to cooperate with the bonnet (12) to drive the bonnet (12) in displacement and the rear part (24) simultaneously towards the front during the displacement of the rear part (24) towards its decapping position.
3. The tool (10) according to claim 2, characterized in that the driving means (44a, 44b) of the bonnet (12) comprise at least one driving finger (44a, 44b) which is arranged at the rear of the rear part (24) of the punch (18) and which is designed to cooperate with a fourth rear edge (38) of the bonnet (12), to drive the bonnet (12) in displacement towards the front.
4. The tool (10) according to claim 3, characterized in that the driving finger (44a, 44b) is mounted so as to be movable between a retracted position, in which the fourth rear edge (38) of the bonnet (12) is able to be formed, and an extended position, in which the finger (44a, 44b) is able to drive the bonnet (12) in displacement towards the front.
5. The tool (10) according to any one of claims 3 and 4, characterized in that the rear part (24) of the punch (18) is delimited by a fourth transverse rear die (36) for the flanging of the fourth rear edge (38) of the bonnet (12).
6. The tool (10) according to any one of the preceding claims, characterized in that the second lateral die (30a) of the punch (18) comprises a first mobile section (34a) which extends longitudinally from a rear end of said second lateral die (30a), and the third lateral die (30b) of the punch (18) comprises a second mobile section (34b) which extends longitudinally from a rear end of said third lateral die (30b), each mobile section (34a, 34b) being mounted so as to be movable on the tool (10) between a working position, in which each mobile section (34a, 34b) is arranged so as to form the bonnet (12), and a decapping position, in which each mobile section (34a, 34b) is retracted transversely towards the interior of the punch (18) to allow the bonnet (12) to be withdrawn from the punch (18) .
7. The tool (10) according to claim 6, characterized in that the rear part (24) of the punch (18), in its working position, is interposed transversely between the first mobile section (34a) of the second lateral die (30a), and the second mobile section (34b) of the third lateral die (30b).
8. The tool (10) according to claim 6, characterized in that the rear part (24) of the punch (18), in its decapping position, is arranged above the first mobile section (34a) of the second lateral die (30a) and the second mobile section (34b) of the third lateral die (30b).
9. The tool (10) according to any one of the preceding claims, characterized in that it comprises flanging means (20) which are designed to cooperate with the first front die (26), the second lateral die (30a) and the third lateral die (30b) of the punch (18) to form the first front edge (28) of the bonnet (12), the second lateral edge (32a) and the third lateral edge (32b) of the bonnet (12) with an undercut respectively.

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