FR3018465A1 - MATRIX WITH EJECTOR FOR EMBOUTIZER WITH GUTTER IN EDGE - Google Patents

Abstract

A die (126) for forming a die (102), particularly a motor vehicle body, includes a generally extended surface (112) for engaging the die (102). said surface (112) including a shoulder portion (130); and an ejector (146) of the stamp (102) out of the die (126). The ejector (146) is oriented to move the stamp (102) in a direction substantially parallel to the mean plane of the extended surface (112). The invention also relates to a tool (106) comprising such a die (126), a presser (116) intended to cooperate with the die (126), a movable punch (122) adapted to cooperate with the portion (130) of the matrix (126). The invention finally relates to a method implemented by such a tool (106).

Description

The invention relates to the field of stamping including body parts of a motor vehicle. More particularly the invention relates to a die, a tool and a method of forming a stamp.

A stamp is a metal part in progress or at the end of manufacture, in thin sheet metal, obtained by stamping. FIG. 1 illustrates a known stamp 2 of a motor vehicle body, in this case a roof covering intended to cover the structure of a vehicle. The cover in question is obtained after several shaping operations, one of which is a shaping of two edges, one edge 4 may be shaped gutter at one end of the cover, an edge 5 may be another shoulder. The lateral edges 3 of the stamping can be folded. FIG. 2 represents a sectional view of a tooling 6 according to the prior art used to shape an edge such as the edge 4 illustrated in FIG. 1. The slightly curved central portion of the cover is previously formatting. A fixed punch 8 and a counter form 10 form a contact surface 12 of the stamp 2 for the purpose of shaping. Part of the surface 12 allows clamping of the stamping 2. The clamping in question is carried out during a shaping cycle during the descent of a frame 14 comprising a spring-loaded presser 16. at the end of the approaching cycle, a slider system provided with a secondary presser 20 and a movable punch 22 presses the end 24 of the press and then shapes the channel 4, the mobile punch 22 deforming the stamping in the counter form 10. The clearance stamping occurs during the cycle away from the frame 14, the movable punch 22 and against the form 10 being spaced from the stamp 2. The presser 16 also deviates from the stamped form. It is known to use this type of technique for forming re-entrant edges against undercut. The force of the clamping is proportional to the energy required for the deformation, it may result in the appearance of quality defects in the case where it is applied to visible parts of the stamping. This is the case for the stamping shown, a marking line forming at the clamping of the counter form 10 and the fixed punch 8. The quality defects result in a rejection which is an economic loss in the vehicle manufacturing process. Such tooling against form is also substantially expensive to achieve. The patent document FR2523485 discloses an ejection element carried by a stamping body for forming a metal part. The body comprises a channel in which the element can slide, actuated by a piston, in order to be able, in its extended position, to clear a workpiece after it has been shaped. This is obtained between a punch, a die and the ejection element which is pushed back into its contraction position. This teaching is interesting with regard to the release of a pressed stamp formed with for example a cavity. However, it must take into account the friction between the shaped face of the stamping with the tool, its sliding during the ejection can increase the machine downtime for cleaning, or even impact the quality of the finished part. The invention aims to propose a solution to the problems encountered by the state of the art such as those mentioned above. More particularly, the invention aims to provide a press tooling solution for stamping, which facilitates the release of a stamping having a shaped cavity-shaped, and is more economical. The subject of the invention is a die-forming die, particularly of a body, comprising a generally extended surface intended to come into contact with the stamping, said surface comprising a portion forming a shoulder; and an ejector of the stamped out of the die, notable in that the ejector is oriented to move the stamp in a direction substantially parallel to the mean plane of the extended surface. According to an advantageous embodiment of the invention, the ejection direction forms an angle of less than thirty degrees with the mean plane of the extended surface, preferably less than twenty degrees, more preferably less than ten degrees. According to an advantageous embodiment of the invention, the ejector is configured to come into contact with the stamping in the portion forming the shoulder. According to an advantageous embodiment of the invention, the ejector is configured to pass through at least one orifice of the die emerging on the portion forming the shoulder.

According to an advantageous embodiment of the invention, the ejector comprises at least one rod sliding through the orifice, said rod or rods being preferably actuated by a jack, preferably a pneumatic jack, said cylinder being fixed to the matrix.

According to an advantageous embodiment of the invention, the travel distance of the sliding rod outside the die when the ejector is activated is between twenty millimeters and eighty millimeters. According to an advantageous embodiment of the invention, the ejector comprises two rods each sliding through an orifice.

According to an advantageous embodiment of the invention, the portion forming the shoulder is located at an edge of the die. According to an advantageous embodiment of the invention, the portion forming the shoulder forms an undercut relative to an ejection direction generally perpendicular to the mean plane of the extended surface.

According to an advantageous embodiment of the invention, the end of the sliding rod of the ejector comprises a concave surface so as to match the shape of the stamping at the undercut of the portion forming the shoulder. Advantageously, a portion of the sliding rod forms an oblong round section.

The invention also relates to a forming tool of a stamped, comprising a matrix; a presser for cooperating with the matrix by approximation to form the stamping; and a movable punch adapted to cooperate with a portion of the matrix forming a shoulder, remarkable in that the matrix is in accordance with the invention.

According to an advantageous embodiment of the invention, the tooling comprises a first frame, the presser being movably mounted on said first frame by springs, preferably of the helical type.

According to an advantageous embodiment of the invention, the mobile punch is fixed in a slider moving in a direction forming a non-zero angle with the direction of movement of the presser. Advantageously, the inclination between the direction of movement of the presser and that of the punch is between five degrees and twenty-five degrees. According to an advantageous embodiment of the invention, the first frame comprises at least one falling blade capable of folding an edge of the stamping around an edge of the die. According to an advantageous embodiment of the invention, the tooling further comprises a fixed punch with a contact surface with the stamping extending the surface portion of the matrix forming the shoulder, the die being movable relative to said punch. fixed. The contact surface of the fixed punch may be in the form of a braking ring. According to an advantageous embodiment of the invention, the tooling comprises a second frame, the die and the fixed punch being mounted on the second frame.

According to an advantageous embodiment of the invention, the matrix is mounted on an elastic system, preferably helical type springs, more preferably gas adjustable springs. According to an advantageous embodiment of the invention, the slider comprises a spring-mounted secondary presser, said presser being able to cooperate with the fixed punch. According to an advantageous embodiment of the invention, the clamping force between the presser and the die is between fifteen tons and twenty tons. According to an advantageous embodiment of the invention, the contact surface of the fixed punch is a first surface, said punch comprising a second contact surface 25 with the stamping, extending the contact surface of the die to an edge opposite to the portion forming the shoulder, said second surface also forming a shoulder. According to an advantageous embodiment of the invention, the second contact surface comprises a clamping portion with the presser.

According to an advantageous embodiment of the invention, the boundary between the die and the fixed punch, intended to be in contact with the stamping, is located on a non-visible portion of the stamping. According to an advantageous embodiment of the invention, the first frame comprises a second movable punch configured to cooperate with the second contact surface also forming a shoulder. The subject of the invention is also a method of forming a stamped article, in particular of a motor vehicle body, comprising the following steps: a) clamping a stamping between a first frame comprising a presser and a movable punch, and, a second frame comprising a matrix and a fixed punch b) forming at least one shoulder in the stamping by application of the movable punch on the die, remarkable in that the die is in accordance with the invention, and by the following step: c) removal of the fixed punch from the die and activation of the ejector of the die for ejection of the stamping.

According to an advantageous embodiment of the invention, the shaped shoulder has a gutter shape, preferably a cavity. According to an advantageous embodiment of the invention, the method comprises the use of a tool according to the invention, the method comprising an intermediate step b ') of removal of the movable punch from the die, said distance being effected by a first relative spacing between the first frame and the second frame, the presser remaining in the working position. According to an advantageous embodiment of the invention, the distance of the punch from the die in step c) is by a second relative distance between the first frame and the second frame, the presser releasing the clamping of the press, the matrix moving away from the second frame pushed by its elastic connection to the second frame. According to an advantageous embodiment of the invention, the stamping is a bodywork element, preferably a roof covering. According to an advantageous embodiment of the invention, the stamping has a length of between one meter eighty and two meters fifty, it has a width of between fifty centimeters and one meter fifty.

According to an advantageous embodiment, the stamping has a thickness of between three tenths of a millimeter and one millimeter twenty-five, preferably between five tenths and eight tenths of a millimeter. The measures of the invention are interesting in that they allow the ejection of a stamping with a shoulder, this shoulder may be located at an edge or form a cavity. Indeed, depending on the profile of the shoulder and / or the friction forces between the shoulder and the matrix, the lateral ejection, that is to say in a direction transverse to the direction of stamping allows a sliding of the stamping on the surface of the matrix and, therefore, easy ejection of the shoulder. In the case where several shoulders are present on the stamping, the use of a fixed punch makes it possible to release the one or more shoulders during the relative movement of the die and hence to disengage this or these shoulders and to allow the sliding of the stamp. Other features and advantages of the present invention will be better understood from the description and drawings in which: FIG. 1 is a view of a stamping device comprising at least one edge forming a shoulder; FIG. 2 is a sectional view of a known stamping press tooling provided with a die and a counter-shape for shaping the edge of the stamping die of FIG. 1; - Figure 3 is a sectional view of a press stamping tool according to the invention, a movable punch being in a close position of a die for forming the shoulder of the stamping of the figure 1 ; FIG. 4 is a view of the tool of FIG. 3, the movable punch being in a position remote from the die; FIGS. 5 and 6 are views of the die and the fixed punch of FIGS. 3 and 4 at the final stages of release of the stamping; Figures 1 and 2 have been previously described in connection with the discussion of the state of the art.

Figures 3 to 5 are views of a press stamping tool 106 according to the invention, each of them having the tool 106 in a particular phase of the stamping process according to the invention. FIG. 3 is a sectional view of a stamping press tooling 106 in accordance with the invention and shown in the step of forming a gutter 104 on an edge 134 of a stamp 102. shape can also be that of a cavity in a central part of the stamping. In order to produce the gutter 104 in question, the tooling 106 mainly comprises a die 126, a presser 116, a movable punch 122 and a fixed punch 108.

The die 126 is movable relative to the fixed punch 108 so as to perform a clearance of the part described in detail below. The matrix 126 and the fixed punch 108 comprise surfaces intended to come into contact with the stamp 102. More precisely and in the working position of the tool as shown, the contact surface 128 of the fixed punch 108 is in the extension a portion 130 of the contact surface of the matrix forming a shoulder. In a preferred embodiment, the border 132 between the die 126 and the fixed punch 108, and intended to be in contact with the stamp 102 is located on a non-visible portion of the embossed 102. This is indeed the limit 132, which, as seen above in relation to the state of the art, is a classic place of possible quality defect of the embossed 102. This limit 132 is in this case at a line of cut of the stamp. The contact surface 112 of the matrix is generally extended; the portion 130 forming a shoulder, located at an edge 134 of the die 126, is intended to cooperate with the movable punch 122 for forming the stamping 102, the remaining contact surface 135 is intended to cooperate with the presser 116 for the clamping of the stamping 102. The contact surface 128 of the fixed punch 108 seen above is a first surface, the fixed punch 108 may comprise a second surface 138 of contact with the stamp 102, extending the surface of contact of the matrix 112 at an opposite edge 140 to the portion 130 forming the shoulder. This second surface 138 may also form a shoulder. A clamping space 142 is formed with the presser 116 on this second surface 138 for shaping this end 140 of the stamping 102. A second movable punch (not shown) is intended to cooperate with the second contact surface 138. in order to perform the formatting in question. In a preferred embodiment, the contact surface 135 between the die 126 and the presser 116 may be limited at its periphery as well as at a few point surfaces in the interior portion of the die.

In the case of shaping and clamping on the second surface 138 of the stationary punch, the presser may be configured not to tighten the die 126 on its edge surface 144 extending the second surface 138 of the fixed punch. FIG. 3 shows the matrix 126 comprising an eductor 146 of the embossment 102 outside the die 126. The ejector 146 is oriented so as to move the stamp 102 in a direction substantially parallel to the mean plane of the extended surface 112 of FIG. the matrix 126. More specifically, the matrix 126 comprises at least one orifice 148 in the surface portion 130 forming the shoulder and the ejector 146 is configured to pass through the orifice (s) 148 to come into contact with the stamp 102. To do this, the ejector 146 comprises at least one rod 150 sliding through the orifice 148. In a preferred embodiment of the invention, that (s) is / are actuated (s) by a pneumatic cylinder 152 attached to the die 126. When the ejector 146 is activated, the travel distance of the sliding rod 150 outside the die 126, which distance can be adjustable according to the desired travel distance of the press, can be between twenty millimeters meters and eighty millimeters. The ejector 146 may comprise two rods 150 each sliding through an orifice 148 of the matrix 126. In a preferred embodiment, the portion 130 forming the shoulder forms an undercut relative to an ejection direction generally perpendicular to the mean plane of the extended surface 112. The end of the sliding rod of the ejector may comprise an outwardly concave surface so as to conform to the shape of the stamp 102 at the undercut. In order to avoid the rotation of the rod 150 in the orifice 148 of the matrix 126 which could modify the shape of the contact between the end of the sliding rod 150 and the stamping 102, the section of the sliding rod can have an oblong round shape.

Figure 3 also shows two frames (114, 154) movable relative to each other. In a particular embodiment, not limiting the scope of the invention, the first frame 114 carries the presser 116 mounted on springs 118 which may be helical type; it also carries a slider 156 to which the movable punch 122 is attached. When the two frames are brought together, and in an embodiment where the portion 130 of the matrix forming the shoulder is undercut, the slide 156 moves in a direction forming an angle with the direction of movement of the presser 116. Angle gear 158, fixed relative to the second frame 154, allows this inclined movement. The inclination between the direction of movement of the presser 116 and that of the movable punch 122 may be between five degrees and twenty-five degrees. In a preferred embodiment of the invention, the first frame 114 further comprises at least one falling blade (not shown) intended to fold down an edge of the stamping 102 around an edge (not shown) of the die 126, this edge being, for example, adjacent to that 130 comprising the shoulder. The second frame 154 comprises the matrix 126 and the fixed punch 108. More specifically, the die 126 is mounted on an elastic system 160 which may be a helical spring system or gas adjustable springs, the latter embodiment. being favorable to the adjustment of the force of the elastic system 160. FIG. 4 is a view of the tooling 106 in the phase of disengagement of the mobile punch 122 from the stamping device 102, during a first phase of moving the frames ( 114, 154). In a particular embodiment, related to the shape and / or the extent of the surface 130 as well as the clamping force necessary for the shaping of the gutter, a secondary presser 162, mounted on a spring, can cooperate with the fixed punch 108, in this case comprising a form 164 of braking ring. The clamping force between the presser 116, the secondary presser 162 and the die 126 may be between fifteen and twenty tons. When the movable punch 122 is released as well as the secondary presser 162, the matrix 126 can remain fixed, it can also be mobile, its movement being configurable at the level of the elastic systems (118, 160) carrying the die 126 and the presser 116 In a preferred mode of the method, the matrix 126 remains fixed at the time of the release of the mobile punch 122 and the secondary presser 162 so as not to generate friction on the embossment 102; the contact surface 128 of the fixed punch 108 always remains, in the latter case, in extension with the portion 130 forming the shoulder of the matrix 126.

Figures 5 and 6 are sectional views of the tool 106, the matrix 126 and the fixed punch 108 being only shown; these figures illustrate the subsequent steps of clearing the stamping 102 of the process according to the invention. FIG. 5 illustrates the clearance phase of the stamping 102 during the removal of the fixed punch 108 from the die 126. This distance, in this case, is by a second relative distance between the first frame (not shown) and the second frame 154, the presser (not shown) releasing the clamping of the stamping 102, the die 126 moving away from the second frame 154 pushed by its elastic connection 160 to the second frame 154. The stamp 102 is thus released from the first surface 136 of the fixed punch 108 as well as the second surface 138 of the fixed punch 108. FIG. 6 illustrates the activation phase of the ejector 146 of the die 126. The stamp 102 is thus released from the portion 130 of the matrix 126 forming the shoulder. The surface 135 of the matrix in contact with the stamp 102 is at this stage a sliding surface against a portion of the stamping 102 not shaped during this process step. The force exerted by the jack 152 on the sliding rod 150 is transmitted on the gutter 104 shaped embossed 102; this force is configurable so as to ensure the displacement of the stamp 102. The lower face 166 of the stamp 102 is in this case a non-visible face. The sequential clearance of stamping 102 during the process, and as described above in FIGS. 4 to 6, is particularly advantageous for improving the efficiency of the operation and reducing quality defects. The tool 106 with the matrix 126 according to the invention is substantially economical because of its concept of simple operation. The stamp 102 may have a length 168 between one meter eighty and two feet fifty, and a width between fifty centimeters and one meter fifty. The stamp may have a thickness 170 between three tenths of a millimeter and a millimeter twenty-five, the thickness 170 may be between five tenths and eight tenths of a millimeter.

Claims (10)

REVENDICATIONS1. A die forming die (126), particularly a motor vehicle body, comprising: - a generally extended surface (112) intended to come into contact with the stamp (102), said surface (112) ) comprising a portion forming a shoulder (130); and - an ejector (146) of the stamp (102) out of the die (126); characterized in that the ejector (146) is oriented to move the stamp (102) in a direction substantially parallel to the mean plane of the extended surface (112). 2. Matrix (126) according to claim 1, characterized in that the ejector (146) is configured to contact the stamping (102) in the portion forming the shoulder (130). 3. Matrix (126) according to one of claims 1 and 2, characterized in that the ejector (146) is configured to pass through at least one orifice (148) of the matrix (126) opening on the portion forming the shoulder (130). 4. Matrix (126) according to claim 3, characterized in that the ejector (146) comprises at least one rod (150) sliding through the orifice (148), said rod (s) (150) being preferably actuated (s) by a jack (152) fixed to the matrix (126). 5. Matrix (126) according to one of claims 1 to 4, characterized in that the portion forming the shoulder (130) is located at an edge (134) of the matrix (126). 6. Matrix (126) according to one of claims 1 to 5, characterized in that the portion forming the shoulder (130) forms an undercut relative to an ejection direction generally perpendicular to the mean plane of the surface extent (112). 7. Tooling (106) for forming a stamp (102) comprising: - a die (126) - a presser (116) intended to cooperate with the die (126) by bringing together to form the stamp (102); and a movable punch (122) capable of cooperating with a portion (130) of the matrix (126) forming a shoulder; characterized in that the matrix (126) is according to one of claims 1 to 6. 8. Tooling (106) according to claim 7, characterized in that it further comprises a fixed punch (108) with a contact surface (128) with the stamp (102) extending the portion (130) of the surface of the matrix forming the shoulder, the die (126) being movable relative to said fixed punch (108). 9. Tooling (106) according to claim 8, characterized in that the contact surface of the fixed punch (128) is a first surface, said punch comprising a second surface (138) of contact with the stamp (102), extending the contact surface of the die (112) at an opposite edge (140) to the portion (130) forming the shoulder, said second surface (138) also forming a shoulder. 10. A method of forming a stamp (102), in particular of a motor vehicle body, comprising the following steps: a) clamping a stamp (102) between a first frame (154) comprising a matrix (126) and a second frame (114) including a presser (116) and a movable punch (122); b) forming at least one shoulder (104) in the stamp (102) by applying the movable punch (122) to the die (126); characterized in that the matrix (126) is according to one of claims 1 to 6; and by the following step: c) moving the fixed punch (108) away from the die (126) and activating the ejector (146) to eject the die (102).