WO2017077208A1

WO2017077208A1 - Tool for crimping the edge of a motor vehicle body element

Info

Publication number: WO2017077208A1
Application number: PCT/FR2016/052642
Authority: WO
Inventors: Jean Marie COQUET; Anthony NOIZET
Original assignee: Peugeot Citroen Automobiles Sa
Priority date: 2015-11-06
Filing date: 2016-10-13
Publication date: 2017-05-11
Also published as: CN108348973A; FR3043346B1; EP3370893B1; FR3043346A1; EP3370893A1; CN108348973B

Abstract

The invention relates to a tool for crimping (102) a stamped edge, in particular a motor vehicle body element, comprising: a die (104) forming a longitudinally extending stationary edge (106), a longitudinally extending movable blade (108) capable of being moved along the stationary edge in the longitudinal direction (L), a template (112) that is mounted on the blade and is intended for positioning said blade relative to the stationary edge (106) of the die, the template comprising: a side contact surface (118) that is intended to closely fit a side surface (114) of the edge and that extends transversely, and a top contact surface (120) that is intended to closely fit a top surface (116) of the edge adjacent to the side surface and that extends transversely, the top contact surface (120) is, furthermore, located at a distance from the side contact surface (118) in the longitudinal direction.

Description

BORING TOOLS FOR EDGES OF BODYWORK ELEMENTS

MOTOR VEHICLE

The invention relates to the field of forming tools. More particularly, the invention relates to the field of crimping tools. The invention also relates to a method implemented by a crimping tool for establishing trajectories for moving a blade of the tool.

Figure 1 is a view of a tool 2 known crimping by bending embossed edges (not shown), including motor vehicle body elements. The tooling comprises a die 4 with a fixed edge 6 extending longitudinally; a movable blade 8 connected to a movable arm 10 and adapted to be displaced by said arm along the edge of the die. The tool is in this case represented in a phase of positioning the blade relative to the matrix, it comprises a template 12 mounted on the blade to ensure this positioning. The template comprises a contact surface with the edge 4 of the matrix, this surface forming a first generally flat portion 20 bearing on the upper surface of the edge 4 and a second portion 18, also generally flat, bearing on the lateral face of the edge. The first surface portion 20 is limited to adjusting the height of the blade without worrying about its inclination with respect to the upper surface of the edge 4. Moreover, this teaching is only satisfactory when the edge of the die is generally rectilinear due to the interference of the lateral zones with the second surface portion 18.

However, motor vehicle body components are today of complex shapes and have edges generally curved and / or curved pronounced and the crimping of such edges is complex.

The object of the invention is to propose a solution that overcomes at least one disadvantage of the state of the art mentioned above. More particularly, the invention aims to provide a crimping tool solution facilitating crimping edges of motor vehicle body elements.

The invention relates to a crimping tool by folding stamped edges (s), comprising: a matrix forming, at one edge, a bearing surface of the or stampings; a movable blade with a contact surface of one of the edges stamp (s) to be moved along the bearing surface of the die to fold said edge; a template for mounting on the blade for positioning said blade relative to the bearing surface of the die; remarkable in that the template comprises: a first wedge configured to extend along the contact surface of the blade and to contact the bearing surface during movement of said blade along the bearing surface of the blade; matrix in the absence of the stamp (s).

According to particular embodiments, the crimping tool may comprise one or more of the following characteristics, taken individually or in any technically possible combination:

the first wedge extends transversely to the moving direction of the movable blade over more than 80% of the width of the bearing surface of the matrix.

- The first wedge extends transversely to the direction of movement of the movable blade over a distance greater than 2mm, preferably greater than 4mm, more preferably still greater than 6mm.

- The contact surface of the movable blade is a left surface of generally twisted shape with a generally flat rear portion for pressing the stamped edges (s), the first shim being located on said rear portion.

the template comprises a second wedge configured to contact a lateral surface of the edge of the die, said wedge being located, in the direction of movement of the movable blade, in front of the first wedge.

- The first and second wedges are separate elements attached to the movable blade, preferably on one side of said blade which is vis-à-vis the side surface of the edge of the die.

- The first wedge has a height between the contact surface of the blade and the bearing surface of the matrix between 1mm and 8mm, preferably between 1.5mm and 6mm, more preferably between 2mm and 4mm. the first wedge and / or the second wedge each comprise a contact surface with the matrix which has a radius of curvature of between 5 mm and 15 mm.

The subject of the invention is also a process for the development of the trajectory of a mobile crimping blade by folding of stamped edges; remarkable in that it comprises the use of a crimping tool according to the invention, and comprises the following steps: i) moving the movable blade, equipped with the first shim, along the bearing surface of the die in the absence of the stamping or stampings, the height (h) of said shim, between the contact surface of the blade and the bearing surface of the die corresponding to the height of the stamped edges (s) crimped; ii) detecting positioning deviations between the first wedge and the bearing surface of the die; iii) correction of the positioning differences by translation (s) and / or pivoting (s) of a movable arm supporting the blade.

According to an advantageous embodiment of the invention, the deviation detection step comprises the detection of positioning deviations between the second wedge and the lateral surface of the edge of the die.

According to an advantageous embodiment of the invention, the method further comprises a step, preceding the step of moving, of applying a layer of colored pigment to the support surface and / or to the lateral surface of the the matrix, the detection of positioning deviations of the blade being based on the observation of areas of non-friction or insufficient friction on said layer of pigment.

According to an advantageous embodiment of the invention, the method further comprises placing one or more comparators on the blade in order to measure distances transversely to the direction of movement of the movable blade and / or the setting of placing a slope indicator on the blade to be bonded to the blade to measure pivot angles of said blade. The jig may comprise a comparator support with fixing means, in particular by screwing, to the movable blade. The support may comprise one or more transverse orifices, preferably perpendicular to the direction of movement of the movable blade, these orifices being configured to support the comparator or comparators. The invention is interesting in that the crimping tool is adapted to easily establish a crimping blade path along a fixed edge of the die. Indeed, the tooling comprises a template with a lateral contact surface on the second shim and / or an upper contact surface on the first shim, these surfaces being configured to slide on the edge of the die during the displacement of the blade along the edge for positioning. The contact surfaces extend transversely with respect to the longitudinal direction of the edge and the blade and the positioning deviations of the blade not producing contact against the edge can be detected and corrected by moving a movable arm carrying the blade. blade. The contact surfaces, in particular may be arranged longitudinally in a manner suitable for crimping, in particular for folding and pressing the stamped edge against the edge of the die. Curved and / or curved stamped edges, in particular of motor vehicle body elements can be crimped simply by such tools.

Other features and advantages of the present invention will be better understood from the description and the drawings, among which:

- Figure 1 is a view of a crimping tool according to the state of the art;

- Figure 2 is a view of a crimping tool according to the invention, in a preferred embodiment of the invention and in the step of moving the method according to the invention;

FIG. 3 is a view of the crimping tool of FIG. 2 at the deviation detection step of the method according to the invention;

FIG. 4 is a perspective view of the blade and the jig of the tooling of FIGS. 2 and 3;

Figure 1 is a view of a crimping tool 2 according to the state of the art. Tooling has been described in connection with the discussion of the state of the art.

Figure 2 is a view of a crimping tool 102 embossed edge (not shown), including motor vehicle body element, according to the invention. It presents a main image on which we can see the blade 108 extending in the longitudinal direction "L" and moving along the edge 106 of the matrix extending in the longitudinal direction.

The tooling comprises a die 104 forming a fixed edge 106 extending longitudinally, a movable blade 108 extending longitudinally, connected to a movable arm 110 and able to be moved by said arm along the edge of the die. In the crimping phase, the blade performs in this movement the folding and pressing of an edge of a pressed against the pressed in question against the edge of another stamped, resting on the edge of the die. It comprises a twist-shaped left surface along the longitudinal direction for the progressive folding of the stamped edge during movement; the twist-shaped surface terminates in a surface portion for pressing the pressed edge. The fixed edge 106 includes a side surface 114 and a bearing surface 116 adjacent to the side surface. The bearing surface is intended to receive the edge or edges of the stampings.

Figure 2 also shows two cross-sectional views "T1" and "T2" of the tooling relative to the longitudinal direction "L".

Referring to these sectional views of Figure 2, the tool also includes a template 112 mounted on the blade, the template being provided for positioning the blade relative to the fixed edge along its movement. The template may comprise a first spacer 112 ¹ with a contact surface 120 able to bear against the bearing surface 116 of the fixed edge. The jig 112 may also comprise a second shim 112 ² with a lateral contact surface 118 able to bear against the lateral surface 114 of the edge. The contact surface 120 extends transversely to the longitudinal direction and is spaced from the lateral contact surface 118 in the longitudinal direction "L".

On the sectional view "T1" of Figure 2 can be seen the second shim 112 ² of the jig 112, comprising the lateral contact surface 118 extending transversely and conforming to the lateral surface 114 of the edge. The lateral surface extends transversely in the direction "K" orthogonal to the longitudinal direction.

On the sectional view "T2" of FIG. 2, the first shim 112 ¹ of the jig 112, comprising the upper contact surface 120 extending transversely and conforming to the bearing surface 116 of the edge which is adjacent to the lateral surface.

If we consider the direction of movement of the blade indicated by the arrow on the main image of Figure 2, the sectional view "T2" having the contact surface 120 of the first shim is located upstream relative to the view in section "T1" presenting the lateral contact surface. Also, the lateral and upper "transversely extending" contact surfaces must be understood to extend mainly in a transverse direction. The lateral and upper contact surfaces may form linear transverse contacts.

Returning to the sectional view "T1" of Figure 2, one can see the longitudinally extending movable blade which includes a twist-shaped left surface 122 along the longitudinal direction "L". The twist surface is intended to fold the pressed edge, in particular the lateral contact surface is situated longitudinally at the level of the twisted surface forming a mean bending angle β of between 20 ° and 70 ° with respect to the upper surface, preferably between 30 ° and 60 °, more preferably between 40 ° and 50 °. This measurement of the invention is interesting in that the lateral contact surface 118 is situated longitudinally at a level where the lateral positioning accuracy of the screwing surface with respect to the edge of the die must be adapted to ensure a folding at the adapted level of the stamped edge.

Returning to the sectional view "T2", one can see the spinning surface which ends with a rear surface portion 124 for pressing the pressed edge against the bearing surface 116 of the edge. In particular, the upper contact surface 120 is located longitudinally at this portion 124 for pressing the stamping. This measurement of the invention is very interesting to ensure a positioning adapted to this longitudinal level of the blade; the upper contact surface 120 is located longitudinally at a level where the positioning accuracy of the blade vis-à-vis the edge of the die must be adapted for pressing the edge of the stamping end crimping. The upper contact surface 120 extends in this case laterally over a distance "D" greater than 2mm, preferably greater than 4mm, more preferably still greater than 6mm. The distance "D" advantageously corresponds to more than 80% of the width This measurement of the invention is interesting in that the upper contact surface 120 can be in contact with the bearing surface 116 of the edge over a distance corresponding to that of the width of the bearing surface. a stamped edge intended to be pressed at the end of crimping. In particular, the first wedge further comprises a bearing surface 126 in contact with the movable blade 108 and which is located opposite the upper contact surface 120. This measure of the invention is interesting for ensuring rigidity of the wedge at the level of the upper contact surface. In particular, the bearing surface 126 may extend transversely and bear against the rear surface portion 124 of the twisted surface and intended to press the pressed edge. This measurement of the invention is particularly advantageous in that the height between the upper contact surface 120 and the bearing surface 126 can precisely correspond to a suitable target distance between the portion 124 of the blade in question and the surface of support 116 at the time of pressing at the end of crimping. The height "h" between the bearing surface 126 and the upper contact surface 120 may be between 1 mm and 8 mm, preferably between 1.5 mm and 6 mm, more preferably between 2 mm and 4 mm. It should be noted that this distance generally corresponds to 3 times the thickness of the stamp, that is to say to the sum of the thicknesses of crimped sheets, that is, in general, 2 times the skin + 1 times the liner , to which can be subtracted a game corresponding to the crushing during the pressing in end crimping.

The method according to the invention is provided to establish trajectories of the movable blade 108 extending longitudinally along the fixed edge. The method is implemented by the crimping tool 102 according to the invention and comprises the following steps: a) displacement of the longitudinal movable blade 108 along the fixed edge 106, the lateral contact surface 118 sliding along the the lateral surface 114 of the edge and / or the upper contact surface 120 conforming and sliding along the bearing surface 116 of said edge. ; b) detecting positioning deviations between the lateral contact surface with respect to the lateral surface of the edge and / or between the upper contact surface with respect to the edge bearing surface; c) correction of positioning deviations by translation (s) and / or pivoting (s) of the movable arm 110. Figure 3 is a view of the die 104 after the step of moving the method according to the invention. In this case, the image presents, in particular, the fixed edge 106 of the matrix. In particular, the method, in a preferred embodiment, further comprises a step, preceding the displacement, of applying a layer of colored pigment 128, such as Prussian blue, to the lateral surface 114 of the fixed edge and / or on the bearing surface 116 of the fixed edge. In this case, we can see on the image a layer of pigment on the bearing surface 116 of the edge of the matrix (see the small lines symbolizing the layer). Moving the movable blade with the lateral and / or upper contact surfaces contacting the corresponding surfaces of the edge generates friction on the pigment layer at contact areas; the removal of the pigment layer is a visible indication of a correct positioning of the blade vis-à-vis the edge. In this case, the measurement of the positioning deviations of the blade is made by reference to the areas of non-friction of the lateral contact surfaces and or higher with the pigment layer, areas on which the pigment layer is not removed. .

As an example, to the right of the image can be seen a first zone "U" of the upper surface of the matrix with respect to which the positioning of the blade during the displacement is adapted. Indeed, the pigment is removed over the entire width "I" of the upper surface 116. The distance "I" must correspond to the distance D (seen with reference to Figure 2). It should be noted that it may be desired to control the pivoting of the blade relative to an axis perpendicular to the upper surface and along the movement of the blade. Indeed, the limit 130 of removal of the pigment forming a line regularly away from the edge of the edge can serve as a witness of the pivoting adapted to the blade along the edge. The edge corresponds to the edge joining the lateral and upper surfaces of the edge.

We can see, as an example, in the middle of the image, a second zone "V" of the upper surface of the edge vis-à-vis which the positioning of the blade during the displacement is not suitable . Indeed, the pigment is removed only over a portion of the width of the upper surface, in this case a portion adjacent to the edge of the edge. The correction of this difference is made by correcting the trajectory of the movable arm carrying the blade. This correction may consist in the occurrence of a pivoting of the blade on the section of displacement of the blade vis-à-vis this second zone. We can see, as an example, to the left of the image, a third zone "W" of the upper surface of the edge vis-à-vis which the positioning of the blade during the displacement is not no more adapted. Indeed, the pigment is removed only over a portion of the width of the upper surface, in this case a portion at a distance from the edge edge. The correction of this difference is also done by correcting the trajectory of the movable arm carrying the blade. This correction may consist in the occurrence of a pivoting of the blade on the section of displacement of the blade vis-à-vis this third zone, the pivoting must here be carried out in the opposite direction to that mentioned with reference to the second zone "V" of the upper surface.

Figure 4 is a perspective view of the blade 108 and the template 112 of the tool according to the invention. It is possible to observe the first and second wedges 112 ¹ and 112 ² forming distinct elements attached to the blade. This measurement is interesting to facilitate the machining of the contact surfaces. In this case, it can be seen that the lateral contact surface 118 and the upper contact surface 120 are formed by cylindrical portions made in each of the spacers. The upper and lateral contact surfaces can in this case be greater than 5mm radius and less than 15mm. The twist surface 122 can be seen in the longitudinal direction "L". It is possible to see on the enlarged zone of the first wedge located under the main image, the upper contact surface 120 and the bearing surface 126 against the rear portion 124 of the spinning surface of the blade intended to press the edge of the blade. 'stamped. The first wedge may be symmetrical so as to mount on a tendril or on its symmetry. For this purpose, a chamfer can be provided on each side of the surface 126.

The jig may comprise a comparator support (not shown) with fixing means, in particular by screwing, to the movable blade. The support may comprise one or more transverse orifices, preferably perpendicular to the direction of movement of the movable blade, these orifices being configured to support the comparator or comparators.

Claims

claims

A crimping tool by folding (102) embossed edges (s), comprising:

a die (104) forming, at an edge (106), a bearing surface (116) of the stamp (es);

- a movable blade (108) with a contact surface (122) of one of the stamped edges (s) to be moved along the bearing surface (116) of the die (104) for fold said edge;

- a template (112) to be mounted on the blade (108) for positioning said blade relative to the bearing surface (116) of the matrix (104);

characterized in that the template (112) comprises:

a first shim (112 ¹ ) configured to extend along the contact surface (122) of the blade (108) and to contact the bearing surface (116) during movement of said blade along the bearing surface (116) of the matrix (104) in the absence of the stamp (es).

2. crimping tool (102) according to claim 1, characterized in that the first shim (112 ¹ ) extends transversely to the direction of movement of the movable blade (108), over more than 80% of the width of the bearing surface (116) of the matrix (104).

3. crimping tool (102) according to one of claims 1 and 2, characterized in that the contact surface (122) of the movable blade (108) is a left surface of generally twisted shape with a rear portion (124). ) generally planar for pressing the stamped edges (s), the first shim (120 ¹ ) being located on said rear portion.

4. crimping tool (102) according to one of claims 1 to 3, characterized in that the template (112) comprises a second shim (112 ² ) configured to contact a lateral surface (114) of the edge (106) of the die (104), said wedge being located, in the direction of movement of the movable blade (108), in front of the first wedge (112 ¹ ).

5. crimping tool (102) according to claim 4, characterized in that the first and second wedges (112 ¹ , 112 ² ) are distinct elements reported on the movable blade (108), preferably on a face of said blade which is vis-à-vis the lateral surface (114) of the edge (106) of the matrix (104).

6. Crimping tool (102) according to one of claims 1 to 5, characterized in that the first wedge (112 ¹ ) has a height (h) between the contact surface (122) of the blade (108) and the bearing surface (116) of the matrix (104) between 1 mm and 8 mm, preferably between 1.5 mm and 6 mm, more preferably between 2 mm and 4 mm.

Crimping tool (102) according to one of claims 4 and 5, characterized in that the first wedge (112 ¹ ) and / or the second wedge (112 ² ) comprise a contact surface with the matrix (104) which has a radius of curvature of between 5mm and 15mm.

A method of focusing the path of a movable crimping blade (108) by folding (102) embossed edges;

characterized in that it comprises the use of a crimping tool (102) according to one of claims 1 to 7, and comprises the following steps: i. moving the movable blade (108), equipped with the first shim (112 ¹ ), along the bearing surface (116) of the die (104) in the absence of the stamping, the height (h) said wedge between the contact surface (122) of the blade (108) and the bearing surface (116) of the die (104) corresponding to the height of the crimped edges (s);

ii. detecting positioning deviations between the first shim (112 ¹ ) and the bearing surface (116) of the die (104);

iii. correction of positioning differences by translation (s) and / or pivoting (s) of a movable arm supporting the blade (108).

9. The method of claim 8, characterized in that the crimping tool (102) is in accordance with one of claims 4 and 5, the deviation detection step comprising the detection of positional deviations between the second wedge (112 ² ) and the side surface (114) of the edge (106) of the die (104).

10. Method according to one of claims 8 and 9, characterized in that it further comprises a step preceding the step of moving, applying a layer of colored pigment (128) on the surface of support (116) and / or on the lateral surface (114) of the matrix (104), the detection of positioning deviations of the blade (108) being based on the observation of zones of non-friction or insufficient friction on said pigment layer.