FR3043926A1 - CAR BODY BODY TOOL FOR AUTOMOTIVE VEHICLE BODY - Google Patents

Abstract

The invention proposes a tool for stamping a sheet (4) with a portion stamped against undercut. The sheet (4) forms a motor vehicle boot skin with a police plate lighting zone. The stamping tool comprises a top frame; a lower frame with a counter-form (22) movable housing in the undercut portion. The counterform (22) receives a matrix (46) and a perforating punch (32) with a discharge passage (48) drop (50) by gravitation. The punch (32) punches the return of the undercut by going up. The die (46) comprises a pusher (52) pushing the chute (50) into the passage (48) while stamping it during drilling of the sheet (4). The descent of the upper frame controls the translation of the counter-form (22) and the punching up movement of the punch (32).

Description

VEHICLE BODY BUILDING TOOL

The invention relates to the field of sheet metal stamping tools. More specifically, the invention relates to an embossing tool perforating upwards. The invention also relates to a stamping tool perforating up a sheet metal stamped against undercut.

The sheets of a motor vehicle commonly have several orifices for attaching equipment or cables. These holes can be made using a punch of a stamping tool mounted on a press. According to certain configurations, it is necessary to perform the punching from below the sheet; by raising the punch relative to its associated matrix. This makes it possible to adapt to certain configurations of stamping tools, and to particular shapes of the sheet.

The document CN 102284592 A discloses a tool for stamping a sheet with a punch perforating the sheet from below. At each piercing, a fall is detached towards the top of the sheet. It is driven from the cutting area by means of a blowing device, which prevents the fall from disturbing the cutting edge. However, the exact escape direction of the fall is not controlled. In addition, this blowing device is complex and expensive. It also requires a spacious clearance area. The object of the invention is to solve at least one of the problems posed by the prior art. More specifically, the invention aims to simplify the evacuation of a fall cut by a perforating punch upwards. The invention also aims to control the movements of an evacuated fall. The invention also aims to provide a robust, compact, economical, reliable, and improving performance. The invention relates to a tool for stamping a sheet, the stamping tool comprising: an upper frame; a lower frame with a matrix; a perforating punch disposed under the die, the die and the punch being configured to perforate the sheet disposed between them by cutting a fall therefrom; remarkable in that in front of the die the punch comprises a chute discharge passage, and in that the die comprises a pusher configured to push the chute in the passage during the perforation of the sheet.

According to particular embodiments, the stamping tool may comprise one or more of the following characteristics, taken individually or according to all the possible technical combinations: the passage comprises a narrowing, the pusher being configured to push the fall through said narrowing. - The lower frame comprises a pivoting lever configured to actuate the punch so as to perforate the sheet, preferably the upper frame is configured to actuate the lever so as to perforate the sheet. - The pivoting lever comprises a cutout in communication with the passage of the punch so as to allow evacuation of the fall through the pivoting lever; the stamping tool further comprising a drop discharge chute adapted to receive the fall under the cutout of the lever. - The stamping tool comprises a stripper configured to clamp the sheet against the matrix during its perforation, the stripper being traversed by the punch. - The lower frame comprises a cap adapted to receive the sheet, the upper frame comprising a presser for clamping the sheet against said cap; the matrix being mounted movably between a position under the cap and a position offset from the cap, adapted for perforating the sheet. - The lower frame comprises a counter-form adapted to cooperate with the interior of a portion undercut the sheet; the counter-form being mounted movable in translation on the lower frame between a drawing position in which the counter-form blocks and / or locks the undercut portion, and a retracted position in which the counter-form allows the withdrawal sheet metal. - The matrix is disposed in the counter-form, the against-form further having a housing receiving the pusher. - The counter-form comprises at least one slider, preferably at least two sliders therethrough and which actuate the punch so as to perforate the sheet. - The upper frame comprises a cam adapted to drive against the form in translation. - The narrowing forms a countersink or an internal shoulder. - The passage is configured to allow evacuation of the fall by gravitation. - The matrix comprises a cavity defined by a cutting edge. - The punch is configured to punch the sheet while climbing into the die. - The pusher is configured to stamp the fall so as to reduce its grip. - The translational movement of the counterform is perpendicular to the perforation direction of the punch. - The height H of the recessed portion undercut the sheet is less than or equal to 10 cm, preferably less than or equal to 5 cm, more preferably less than or equal to 35 mm. - The center of the perforation is at a distance E of the outer edge of the sheet less than or equal to 5 cm, preferably less than or equal to 3 cm. - The width of the perforation is greater than or equal to the distance between said perforation and the outer edge of the sheet. The width being measured perpendicularly to the outer edge. - At least one or each slider is actuated by the upper frame and / or the pivoting lever. - At least one slide comprises a conduit in communication with the passage of the punch, in particular in line with said passage. - The cam of the upper frame is configured to cooperate with the pivoting lever and / or with a slider so that the punch perforates the sheet. - The stamping tool is configured for a sheet of thickness between 0.10 mm and 6.00 mm, preferably between 0.30 mm and 2.00 mm. - The undercut portion has an upper band and a lower band; viewed in profile, said strips are inclined relative to each other by an angle β less than 90 °, preferably less than or equal to 70 °, more preferably less than or equal to 45 °. Said portion has a main elongation, the profile being perpendicular to the elongation. The invention also relates to a stamping tool comprising a support frame; a mobile frame; remarkable in that the support frame comprises a counter-form with a matrix and a perforating punch; the die and the punch being configured to perforate a sheet disposed between them; the counterform being mounted movable in translation on the lower frame between a stamping position in which the counter-form cooperates with the sheet, and a retracted position in which the counter-form allows the removal of the sheet. The movable frame may correspond to the upper frame, and the support frame may correspond to the lower frame.

In general, the particular modes of each object of the invention are also applicable to the other objects of the invention. As far as possible, each object of the invention is combinable with other objects. The invention makes it possible to manage the fall by preventing it from moving in an uncontrolled manner in the tool. As soon as it is cut, it comes into contact with the pusher which directs it in the passage of the punch. Thanks to the narrowing, it can not emerge from the passage, and can no longer return to the matrix. In parallel, the narrowing reduces the size of the fall, which facilitates its evacuation by gravitation through the punch. The invention also provides a space-saving solution, which can in particular be implemented in a thin and narrow zone of a counter-form. This is particularly beneficial in the context of an undercut skin. Indeed, the height of such a zone is reduced, and does not intrinsically offer clearance through which the fall can be evacuated. The invention thus allows perforations by slightly adjusting a stamping tool that already performs other operations. As a corollary, these complex perforations do not need to be made to the shoe. Other features and advantages of the present invention will be better understood from the description given by way of example and with reference to the drawings among which:

Figure 1 shows in section a stamping tool in the open position in which a sheet is installed.

Figure 2 illustrates in section the stamping tool of Figure 1 where the upper frame has moved against the form.

Figure 3 shows in section the stamping tool of Figure 1 in the closed position and perforating a sheet.

Figure 4 shows in section a portion of the stamping tool of Figure 1 where the sheet is maintained.

Figure 5 sketches in section the portion of the stamping tool of Figure 4 where the sheet is perforated.

Figure 6 sketches in section the portion of the stamping tool of Figure 4 where the fall is removed via the passage of the punch.

In the following description, the direction of perforation and / or the closing direction of the tool correspond to the direction in which the punch perforates the sheet. These directions can be vertical. The transverse direction may be perpendicular to the direction of perforation.

Figure 1 shows the stamping tool 2 in an open position where it accommodates a sheet 4 which is also seen in section. Sheet 4 is drawn with a dotted line.

The sheet 4 has an undercut portion 6. This portion 6 may be a portion previously stamped. It has an undercut appearance in that it has a return from the outer edge 8 of the sheet 4 which is transverse to the perforation direction. The undercut portion 6 has a lower band 10 folded and facing the upper band 12, said bands (10; 12) being joined at the outer edge 8. They form a vertical stack locally delimiting a groove. The sheet 4 may be a sheet 5 of a motor vehicle, for example a bodywork element such as a skin. In a nonlimiting manner, there is shown here a top of chest skin receiving the font plate lighting. The sheet 4 may be steel, and its thickness of the order of 0.65 mm. An application to aluminum and / or other thicknesses are possible. The stamping tool 2 comprises a lower support frame 14 and a movable upper frame 16 vertically relative to the lower frame 14, or in the direction of perforation. The lower frame 14 is equipped with a cap 18 receiving the sheet 4, and a chute 20 for collecting and discharging falls produced by the perforation of the sheet 4. In addition a counter-form 22 is mounted so that mobile on the lower frame 14 through a slide. This counter-form 22 has a complementary part 24 whose external surface is complementary to the inner surface of the groove of the undercut 6 of the sheet 4. In the state shown, the counter-form 22 is at a distance from the undercut portion 6, which allows to freely place the sheet 4 on the cap 18.

Figure 2 shows the stamping tool 2 in a position where the upper frame 16 is lowered to the lower frame 14. It is close to the sheet 4.

The upper frame 16 comprises a cam 26, which is optionally beveled, and which cooperates with the against-shape 22 so as to move it in translation. The latter may also have a complementary cam 28, or follower, optionally with a bevel. When the parallel bevels slide against each other following the descent of the upper frame 16, the counter-form 22 moves so that its complementary part marries the inside of the undercut portion 6 of the sheet 4. It moves towards the outer edge 8 of the sheet 4, to the left of the figure, until it stops against a lateral stop 30 of the lower frame 14. The complementary part 24 offers a surface of support above and below for sheet 4.

Figure 3 shows the stamping tool 2 in the closed position for stamping. The perforating punch 32 perforates the sheet 4 at the level of the undercut portion 6.

Specifically, the punch 32 perforates the lower band of the undercut portion 6. In doing so, the punch 32 penetrates the groove upwards, and is closer to the upper band. Prior to the perforation, the presser 34 is applied against the upper surface of the sheet 4, and presses the latter against the cap 18 and against the counterform 22. The perforation operation is controlled by the descent of the upper frame 16. This actuates the perforating rise of the punch 32, possibly indirectly. The lower frame 14 may include a lever mechanism. A lever 36 may be pivotally mounted on the counter-form 22. The pivoting lever 36 is disposed under the counter-form 22 for the sake of compactness, but it could be placed above to simplify the mechanism. The counter-form 22 has two slides (38; 40) passing vertically therethrough and cooperating with the pivoting lever 36 so as to tilt it.

During its descent, the upper frame 16 drives the solid slider 38, possibly via its cam 26. This causes the rotation of the pivoting lever 36, which in turn raises the recessed slide 40 which is connected to the perforating punch 32. By this sequence simultaneously, the sheet 4 is perforated. A drop is cut and is evacuated via a duct of the recessed slide 40, via a cutout 42 notching the lever 32, then via the chute 20. The cut 42 of the lever 36 can form a fork. The presence of a cutout 42 simplifies the mechanism, makes it more compact, and simplifies the circuit that follows the fall. Alternatively it could be a through hole. The crossing of the punch 32 by the fall will be detailed below.

In addition, the stamping tool 2 can perform other functions. This results in the fact that at the same time that the sheet is perforated by the present punch 32, it can be perforated at other places by other punches, some of its edges may have fallen, and its surfaces may be more curved. An economy is thus allowed.

FIG. 4 is a detailed view of the stamping tool 2 at the upper end of the punch 32. Here, the tool 2 is shown in a state where the stripper 44 has just come into contact with the sheet 4, more precisely the lower band 10. The punch 4 is flush with the sheet 4, and the presser plates the sheet 4.

The stripper 44 keeps the sheet 4 while it is perforated, but also at the exit of the punch 32. It can be a blank holder. It is made of a polymer material, for example polyurethane, in particular to offer a certain elasticity.

The lower frame comprises a die 46 which is mounted on the counter-form 22. The die 46 has a cavity whose circumference is marked by a cutting edge. The contour of this stop may be complementary to the cutting edge that surrounds the associated punch 32. A perimeter game can separate them. The punch 32 shown here is circular. It may be suitable for producing orifices with a diameter of between 10 mm and 10 cm, possibly equal to 12 mm. The punch and the die according to the invention can also make it possible to produce rectangular windows, or any other shape.

The undercut portion 6 has a height H and a length L of between 2 cm and 6 cm; possibly equal to 30 mm or 35 mm. The center of the perforation is at a distance E from the outer edge 8 of the sheet; said gap E being between 15 mm and 40 cm; possibly equal to 20 mm. The angle β of inclination between the lower band 10 and the upper band 12 is less than 90 °; it can be less than or equal to 45 °.

Figure 5 details the perforation of the sheet 4. The perforating punch 32 is moved upwards by the action of the upper frame.

The punch 32 comprises a passage 48 which passes through it vertically. At its upper entrance, it forms a hollow. The rise of the punch 32 cuts and detaches a fall 50 of the sheet 4. This fall 50 is raised and introduced into the cavity of the die 46.

The lower frame has a pusher 52 which equips the die 46. The pusher 52 forms a finger extending downward towards the passage 48 of the punch 32. As it continues to rise, the latter pushes and deforms the chute 50 against the Pusher 52. Initially flat disk-shaped, the drop 50 gradually becomes concave (as shown in dotted lines), like a bowl. It is pressed between the pusher 52 and the punch 32.

FIG. 6 represents the evacuation of the chute 50. The punch 32 continues to rise and the pusher 52 forces the introduction of the chute 50 inside the passage 48, punch 32.

The passage 48 has a narrowing 54 at its upper entrance. The pusher 52 and the narrowing 54 are configured to reduce the extent of the chute 50 to better slide in the passage 48. When the pusher 52 pushes the chute 50 through the narrowing 54, it deforms plastically. It gets deeper and its perimeter decreases, facilitating its gravitational evacuation. However, deformation and narrowing of the fall are not essential to the invention. Indeed, in the case of a rectangular chute and a rectangular passage, the pusher helps fall to fall in the passage without necessarily deform.

When stamping the chute 50, it can adhere to the pusher 52 and out of the passage 48 to the die 46. This phenomenon is countered by the shrinkage 54. Indeed, after stamping the chute 50 has a return elastic which increases its upper diameter. This will abut against the lower surface of the constriction 54. Advantageously, the constriction has a lower annular hook 56, such as a shoulder, which blocks the ascent of the chute 50.

After evacuation of the fall, the punch 32 goes down, the tool 2 is opened by raising the lower frame; This allows the return to the rest position of the counter-form 22. A new sheet to perforate can replace the previous 4. The various elements return to their rest position by means of elastic (not shown).

Claims (10)

1- stamping tool (2) of a sheet (4), the stamping tool (2) comprising: o an upper frame (16); a lower frame (14) with a matrix (46); a perforating punch (32) arranged under the die (46), the die (46) and the punch (32) being configured to perforate the sheet (4) arranged between them by cutting a drop (50) therein; characterized in that in front of the die (46) the punch (32) comprises a drop discharge passage (48), and in that the die (46) comprises a pusher (52) configured to pushing the chute (50) into the passage (48) during perforation of the sheet (4). 2- stamping tool (2) according to claim 1, characterized in that the passage (48) comprises a narrowing (54), the pusher (52) being configured to push the chute (50) through said narrowing (54). ). 3- stamping tool (2) according to one of claims 1 to 2, characterized in that the lower frame (14) comprises a pivoting lever (36) configured to actuate the punch (32) so as to perforate the sheet metal (4), preferably the upper frame (16) is configured to actuate the lever (36) so as to perforate the sheet (4). 4- stamping tool (2) according to claim 3, characterized in that the pivoting lever (36) comprises a cutout (42) in communication with the passage (48) of the punch (32) so as to allow an evacuation of the chute (50) through the pivoting lever (36); the stamping tool (2) further comprising a discharge chute (20) chute (50) adapted to receive the chute (50) under the cutout (42) of the lever (36). 5- stamping tool (2) according to one of claims 1 to 4, characterized in that it comprises a stripper (44) configured to clamp the sheet (4) against the matrix (46) during its perforation, the stripper (44) being traversed by the punch (32). 6. Drawing tool (2) according to one of claims 1 to 5, characterized in that the lower frame (14) comprises a cap (18) adapted to receive the sheet (4), the upper frame (16) comprising a presser (34) for clamping the sheet (4) against said cap (18); the die (46) being movably mounted between a position under the cap (18) and a position offset from the cap (18), adapted for perforation of the sheet (4). 7-stamping tool (2) according to one of claims 1 to 6, characterized in that the lower frame (14) comprises a against-shape (22) adapted to cooperate with the interior of a portion against de-dusting the sheet (4); the againstform (22) being mounted to move in translation on the lower frame (14) between a drawing position in which the counter-form (22) blocks the undercut portion, and a retracted position in which the against -form (22) allows the removal of the sheet (4). 8- Stamping tool (2) according to claim 7, characterized in that the matrix is disposed in the against-shape (22), against-shape (22) further having a housing receiving the pusher (52). 9-Stamping tool (2) according to one of claims 7 to 8, characterized in that the against-shape (22) comprises at least one slide (38; 40), preferably at least two slides (38; 40 ) therethrough and which actuate the punch (32) so as to perforate the sheet (4). 10- Stamping tool (2) according to one of claims 7 to 9, characterized in that the upper frame (16) comprises a cam (26) adapted to drive against the form (22) in translation.