WO2008152307A2 - Hybrid part, mould and method for making such part - Google Patents

Abstract

The hybrid part of the invention includes a metal body (14A, 14B) and a body of a plastic material (16) partially covering the metal body (14A, 14B). The metal body (14A, 14B) includes first and second opposite surfaces (18A1, 18A2, 18B1, 18B2). The first and second opposite surfaces (18A1, 18A2, 18B1, 18B2) respectively include first and second areas (22A1, 22A2, 22B1, 22B2) free from the plastic material and including at least one punched area (26A, 26B). During the part manufacturing method, the areas (22A1, 22A2, 22B1, 22B2) of the metal body (4A, 14B) to be free from the plastic material are clamped between first and second clamping surfaces (32A1, 32A2, 32B1, 32B2), and the areas (22A1, 22A2, 22B1, 22B2) clamped between the clamping surfaces (32A1, 32A2, 32B1, 32B2) of the mould (10) are punched during the closing of the mould (10).

Description

 Hybrid part, mold and method of manufacturing such a part

The present invention relates to a method of manufacturing a hybrid part. It applies in particular, but not exclusively, to the field of the automobile. It is known, particularly from US 2005/0127564, a method for manufacturing a hybrid part comprising a metal body, generally in the form of a plate, and a plastic body partially covering the metal body. The metal body includes first and second opposing faces interconnected by edges. The opposing surfaces respectively comprise first and second clear areas of plastic.

In the method described in US 2005/0127564, the metal body is placed in a mold comprising first and second parts movable relative to each other between open and closed positions of the mold. The two parts of the mold are configured to grip the edges of the metal body and leave it free in its central part.

During this process, the plastic is injected into contact with one of the surfaces of the metal body. It is contained in a molding space delimited, on the one hand by the enclosed edges and, on the other hand, by said surface. Thus, under the effect of the pressure of the plastic material, the metal body is formed against one of the parts of the mold.

However, the metal body of the hybrid part thus manufactured being covered on one of its opposite surfaces of plastic, such a hybrid part does not allow to exploit separately the advantages of metal and plastic.

The object of the invention is to provide a method of manufacturing a hybrid part making it possible to make the best use of the advantages of metal and plastic.

For this purpose, the subject of the invention is a method for manufacturing a hybrid part for a motor vehicle in a mold, the part comprising a metal body and a body made of plastic partially covering the metal body, the metal body comprising first and second opposed surfaces, the first and second opposed surfaces respectively comprising first and second clear areas of the plastic material, the mold comprising first and second movable portions relative to each other between open and closed positions; closure of the mold, and between which the metal body is placed, in which process the zones of the metal body intended to be disengaged from plastic are sandwiched between first and second pinch surfaces carried respectively by the first and second second parts of the mold, characterized in that the areas gripped between the clamping surfaces of the mold are pressed during the closure of the mold.

Indeed, in manufacturing a hybrid part, one seeks in particular to exploit the various advantages of plastic and metal on parts of the hybrid part for which the use of plastic or metal is advantageous. Thus, the metal is generally chosen for relatively large parts of the part that do not require complex shaping, the large metal parts being, moreover, cheaper than the large plastic parts. On the contrary, the plastic is generally chosen for parts of the hybrid part having complex shapes, the plastic being easier to form by molding than is the metal by stamping.

The method according to the invention makes it possible, within the same mold, to stamp the metal body and to mold the body of plastics material. Thus, the benefits of metal and plastic are provided for parts of the hybrid part where the use of the metal or plastic is advantageous. Indeed, one can manufacture a hybrid part comprising firstly, a relatively large metal body, clear of plastic in the open areas and stamped by the clamping surfaces and, secondly, a plastic body molded on the metal body, out of clear areas of plastic, and having complex shapes for example, to fix the hybrid part to a vehicle body.

In addition, the method according to the invention is particularly advantageous in the case where, for the purpose of stamping the metal body, no complex preliminary operations are performed other than the unwinding and cutting operations of the sheet which is generally packaged in the form of a sheet metal coil. In addition, before placing the metal body in the mold, it is cut into a desired shape. The more the shape of the stamped metal body is close to that of the unrolled unwound body, the more one minimizes the loss of material related to the cutting of the metal body.

Advantageously, the metal body having an edge interconnecting the surfaces of cohesion of the opposite surfaces, the edge and the cohesion surfaces being intended to be overmolded by the plastic body, the edge and the cohesion surfaces are positioned in a space. molding the plastic material.

It is then easy to connect the metal body and the plastic body. Indeed, by positioning the edge and the cohesion surfaces in the molding space of the plastic body, covers the edge and cohesion surfaces connecting the edge of the metal body with plastic. Advantageously, the edge and the cohesion surfaces are positioned by moving the cohesion surfaces relative to the zones intended to be clear of plastic, preferably when the first and second parts of the mold are in the closed position of the mold in which the areas to be clear of plastic are sandwiched between the nip surfaces.

According to one embodiment of the method according to the invention, the edge is folded with respect to the areas intended to be clamped between the nip surfaces, preferably before closing the mold.

By folding the edge before closing the mold, it can then position more precisely and easily the metal body between the two parts of the mold. Indeed, the folded edge forms a reference edge for positioning the metal body relative to the portion of the mold on which it is disposed.

In addition, in certain mold configurations, it is avoided, when the mold is closed, that one of the parts of the mold comes into contact with the metal body and does not move the latter.

Optionally, the metal body is fixed to one of the nip surfaces.

This immobilizes the metal body that can not move relative to the pinch surface on which it is fixed during the closure of the mold.

According to another embodiment of the method according to the invention, the metal body is separated into at least two secondary metal bodies by moving the first and second mold parts towards the closed position of the mold.

In this embodiment, the closure of the mold is used to separate the metal body, for example by tearing or cutting the metal body.

The invention also relates to a mold for the manufacture of a hybrid part for a motor vehicle, the part comprising a metal body and a plastic body partially covering the metal body, the metal body comprising first and second surfaces opposite the first and second opposed surfaces respectively comprising first and second areas clear of the plastic material, the mold comprising first and second parts between which the metal body is to be placed, movable relative to each other between opening and closing positions of the mold, the first and second parts respectively comprising first and second gripping surfaces intended to come into contact with the first and second surfaces of the metal body, characterized in that at least one of the first or second nip surfaces comprises means for stamping zo are unobstructed. -AT-

The mold according to the invention makes it possible to stamp the metal body and to mold the plastic body in the same mold. To manufacture a hybrid part, it is no longer necessary to use a stamping tool for the metal body and a molding tool for the plastic body. According to an optional feature of the mold according to the invention, the mold comprises means for positioning an edge of the metal body in a molding space of the plastic material.

The positioning means make it possible to maintain and, where appropriate, to move the edge of the metal body in the molding space once the mold is in the closed position.

In addition, these positioning means make it possible to ensure the centering of the edge in the molding space. In this way, the positioning means make it possible to prevent the edge or one of the opposite surfaces of the metal body from being in contact with the mold and thus preventing the plastic material from covering the edge and / or one of the surfaces. opposed.

Advantageously, the positioning means of the edge of the metal body are movable between: a retracted position in which the positioning means are not in contact with the metal body, and - a biasing position of the metal body in the molding space in which the positioning means are in contact with the metal body. Such positioning means make it possible to improve the appearance of the plastic body. Indeed, during the injection step of the plastic material, the edge of the metal body is positioned and maintained in the molding space by the positioning means in the biasing position. After this injection step, the positioning means can be moved to the retracted position so as not to leave an imprint in the plastic body.

In addition, the means being mobile, they allow, if necessary, to bend the edge of the metal body relative to the open areas to be clamped between the clamping surfaces.

Advantageously, at least the first and second nip surfaces comprise a coating or are surface treated, the coating or surface treatment being preferably of low friction type.

The coating or the surface treatment makes it possible to promote the sliding of the metal body relative to the surfaces of the mold. Indeed, there is a sliding during the closure of the mold between the unobstructed parts of plastic material and the surfaces pinch. In some cases, there is also a slippage between the parts to be overmolded by the plastic and the molding surfaces of the plastic body.

Optionally, the mold comprises fastening means of the metal body adapted to fix the metal body on one of the clamping surfaces, preferably magnetic means.

Such means make it possible to ensure that the metal body can not move when closing the mold with respect to the nip surface on which it is fixed. These fixing means may be of the pneumatic, mechanical and preferably magnetic type.

Indeed, these allow a fixation of the metal body in the mold without leaving an imprint in the plastic body as would possibly mechanical means. In addition, the magnetic means can be easily synchronized with the movements of the mold parts. The invention further relates to a hybrid part for a motor vehicle manufactured by a method as defined above, characterized in that the first and second cleared areas of material comprise at least one stamped area.

With the method according to the invention, one can choose the best material, plastic or metal, depending on the characteristics that must present the different parts of the room. Thus, for example, the metal body will form a part of the part to have high elastic mechanical properties while the plastic body will more advantageously form a part of the part to have mechanical properties of resistance to deformation.

In addition, such a hybrid piece has good acoustic properties. In fact, generally, the hybrid part is subjected to the vibrations of the vehicle. In some cases, particularly in the case of low-frequency vibrations, the metal body resonates with these vibrations and produces acoustic discomfort for the occupants of the vehicle. The plastic body absorbs vibrations but also shifts the resonance frequencies of the metal body so that the acoustic discomfort is eliminated. In other cases, especially in the case of high frequency vibrations, the metal body absorbs these vibrations. The absorption of these vibrations is all the more important that the metal body has large dimensions.

Advantageously, the metal body is overmolded by the plastic body on an edge and on cohesive surfaces interconnected by this edge, the plastic body being interrupted in the first and second clear zones. The plastic body then encloses the metal body in the manner of a clamp. In this way, there is good cohesion between the metal body and the plastic body.

Advantageously, the plastic body covers the entire edge surrounding the metal body.

In such a room, each first and second cohesive surfaces, covered by the plastic body, respectively surround each first and second clear plastic surfaces. The cohesion between the metal body and the plastic body of such a hybrid part is therefore excellent. Thus, the hybrid part comprises at least a portion comprising, in its thickness, only plastic. The hybrid part also comprises at least one part comprising, in its thickness, only metal and at least one part comprising, in its thickness, the plastic covering the metal body on its two opposite surfaces. Optionally, the edge is bent with respect to the first and second clear areas of plastic.

Advantageously, the metal body has orifices connecting the opposite surfaces.

The cohesion orifices allow a better mechanical cohesion between the plastic body and the metal body and the creep of the plastic material on either side of the orifices.

In addition, the orifices facilitate, where appropriate, folding, stamping, and tearing of the metal body when they are arranged respectively along the lines of folding, stamping and tearing. In this case, the orifices generally have a general slot shape.

According to another characteristic of the hybrid part according to the invention, the opposite surfaces of the metal body comprise a coating or are surface-treated.

Such a coating or surface treatment makes it possible, when it is of the anticorrosion type, for example in the case of a coating deposited by cataphoresis or by galvanizing, to protect the metal body against corrosion.

On the other hand, depending on the nature of the coating or surface treatment, the latter can form a physical-chemical binding interface with the plastic body which improves the cohesion between the metal body and the plastic body.

Another object of the invention is a set of first and second hybrid parts as defined below each comprising first and second bodies metal, characterized in that the metal bodies are secured to one another by the common body made of plastic material.

The invention also relates to a spare wheel container for a motor vehicle characterized in that it comprises a hybrid part as defined above or an assembly as defined above.

The invention finally relates to a floor for a motor vehicle characterized in that it comprises a hybrid part as defined above or an assembly as defined above.

The invention will be better understood on reading the description which follows, given solely by way of nonlimiting example and with reference to the drawings, in which: FIG. 1 is a top view of a wheel tray of emergency device comprising an assembly according to the invention comprising two hybrid parts according to first and second embodiments of the invention; FIG. 2 is a sectional view of a mold for manufacturing the tray of FIG.

1 according to a first embodiment of the invention in the open position; Figure 3 is a sectional view of the mold of Figure 2 in the closed position; Figure 4 is an enlargement of the area IV of Figure 3; Figure 5 is a sectional view of a floor for a motor vehicle comprising a hybrid part according to a third embodiment of the invention; Figure 6 is a sectional view of a mold according to a second embodiment of the invention in the open position; Figure 7 is a sectional view of the mold of Figure 6 in the closed position. There is shown in Figures 2 to 4 a mold 10 for the manufacture of the tray 12 of Figure 1. In these Figures 2 to 4, there is shown axes X, Y, Z orthogonal to each other corresponding to the axes of the tray 12 such as shown in Figure 1.

Referring to Figure 1, the spare wheel container 12 comprises first and second hybrid parts 12A and 12B each respectively comprising a first and a second metal body 14A, 14B secured to one another by a common body in plastic 16 partially covering each of the metal body 14A and 14B.

The metal body 14A is generally disk-shaped and the metal body 14B is generally plate-shaped having a convex side 15 in a circular arc, this convex side 15 following part of the contour of the metal body 14A.

As shown in Figures 1 and 3, Figure 3 wherein the assembly 12 is shown in the mold, the common body 16 comprises two peripheral portions 16A and 16B respectively adjacent to the first and second metal body 14A and 14B. The common body 16 also comprises two recesses 16C and 16D respectively connecting firstly the portion 16A and the metal body 14A and, on the other hand, the metal bodies 14A, 14B between them.

The first metal body 14A and shifted in the Z direction relative to the metal body 14B and the plastic parts 16A, 16B, can receive a spare wheel for a motor vehicle (not shown). The tray 12 is secured to the body of the motor vehicle by the fixing means 17, in this case passage holes for screws.

As illustrated in FIG. 2, each metal body 14A, 14B respectively comprises first and second opposite surfaces 18A1, 18A2, 18B1, 18B2.

The surfaces 18A1 and 18B1 are also visible in FIG. 1. These surfaces 18A1,

18B1 are interconnected by an edge respectively designated by the reference 2OA and

2OB surrounding the metal body 14A, 14B corresponding.

With reference to FIG. 3, each opposite surface 18A1, 18A2, 18B1, 18B2 comprises, on the one hand, zones freed of plastic respectively referenced 22A1, 22A2, 22B1, 22B2 and cohesion surfaces covered by the common body 16 and respectively referenced 24A1, 24A2, 24B1, 24B2.

In this way and as shown in FIGS. 1, 3 and 4, each metal body 14A, 14B is overmolded with plastic material on a cohesive portion P formed by the edge 20A, 20B and on the cohesion surfaces 24A1, 24A2, 24B1. , 24B2. The common body 16 stops in the first and second clear zones 22A1,

22A2, 22B1. 22b2.

As shown in FIG. 4, each edge 20A, 20B is folded with respect to the first and second clear zones 22A1, 22A2, 22B1, 22B2. In addition, each metal body 14A, 14B comprises, on the first and second unobstructed areas 22A1, 22A2, 22B1, 22B2, respectively stamped areas referenced 26A, 26B.

FIGS. 2 to 4 show the mold 10 for manufacturing the assembly 12 according to a first embodiment of the invention. This mold 10 comprises first and second parts 28, 30 movable relative to each other between open (Figure 2) and closed (Figure 3).

Referring to Figure 2, each portion 28, 30 respectively comprises first and second nip surfaces 32A1, 32A2, 32B1, 32B2 intended to come into contact with the surfaces 18A1, 18A2, 18B1, 18B2 of the corresponding metal body. In addition, each portion 28, 30 respectively comprises first and second molding surface 36, 38 of the common body 16 of plastic. As illustrated in FIG. 3 in the closed position of the mold, the molding surfaces 36, 38 define a molding space E of the common body 16.

Each portion 28, 30 comprises positioning means 40 of each edge 20A, 20B in the molding space E. In the present case and as shown in FIGS. 2 to 4, the means 40 comprise sliding pistons 42 capable of sliding in a housing 44. The means 40 are arranged in pairs, each pair comprising a first means arranged in the first part 28 and a second corresponding means, arranged in the second part 30, generally facing the first means.

As shown in FIG. 2, the pistons 42 are in a retracted position in the housing 44. In this position, the pistons 42 do not penetrate into the molding space E and are not in contact with the metal bodies 14A, 14B . As shown in Figures 3 and 4, the pistons 42 are in a biasing position of the metal body 14A, 14B. In this position, the pistons 42 are in contact with each corresponding metal body 14A, 14B, in particular with the cohesion surfaces 24A1. 24a2.

As shown in Figures 2 to 4, each piston 42 of the same pair slides along an axis C common to the two pistons of the same pair. This axis C is substantially perpendicular to the molding surfaces 36, 38 so that the biasing of the corresponding metal body 14A, 14B is optimal. In these same figures, thanks to the positioning means 40, each metal body 14A, 14B is centered in the molding space E.

Each nip surface 32, 34 comprises stamping means 46A and 46B for forming respectively the unobstructed areas 22A1, 22A2 and 22B1, 22B2. With reference to FIG. 2, the embossing means 46A comprise, on the one hand, stepped embrasures 48 in the form of a star around a circular hole 50 formed on the surface 32 and, on the other hand, stacked crenellations 52 in star shape around a cylindrical stud 54 formed on the surface 34. The embrasures 48 and the hole 50 have a shape complementary to the crenellations 52 and the stud 54 so as to stamp the metal body 14A and to give it the desired shape.

The embossing means 46B comprise, on the one hand, a slot 56 formed on the surface 32 and, on the other hand, an embrasure 58 formed on the surface 34. The slot 56 and the recess 58 extend in the direction Y. Similarly to the means 46A, the slot 56 has a shape complementary to the embrasure 58. The mold 10 makes it possible to manufacture the set 12 of hybrid parts 12A, 12B according to the method according to a first embodiment of the invention, the main aspects of which relate to the invention will be specified below.

When the mold 10 is in the open position, each metal body 14A, 14B is placed between the two parts 28, 30. In this case, the body 14A is fixed to the surface 32A1 and the body 14B to the surface 32B2 thanks to fastening means 6OA, 6OB arranged in the parts 28 and 30 of the mold 10. In the example illustrated in FIGS. 2 and 3, these means

6OA, 6OB comprise magnetic means, for example a controlled magnet.

As shown in FIG. 2, before closing the mold, the edges 20A and 20B are folded to form the recess 16D with respect to the zones 22A1, 22A2,

22B1, 22B2 intended to be clamped between the gripping surfaces 32A1, 32A2,

32B1, 32B2. In this way, it is avoided that these two edges 2OA and 2OB do not come into contact with each other when closing the mold. The folding step can be performed manually by an operator but also by automatic means, for example, an articulated robot. When performed by automatic means, this folding step can reproducibly position the edges 2OA and 2OB in the molding space E.

Then, the mold 10 is closed by bringing the parts 28 and 30 closer to one another.

When closing the mold 10, the edges 20A and 20B as well as the cohesion surfaces 24A1, 24A2, 24B1, 24B2 come into contact respectively with the molding surfaces 36 and 38. In order to allow the sliding of the edges 2OA, 2OB and surfaces

24A1, 24A2, 24B1, 24B2 on the molding surfaces 36, 38, the mold comprises, on the molding surfaces 36, 38, a Teflon coating. Alternatively, the molding surfaces 36, 38 are surface-treated. This sliding is favored by a coating or, alternatively, a treatment, surfaces 18A1, 18A2, 18B1, 18B2 of each body 14A,

14B. In this case, each body 14A, 14B comprises a calender film.

When the mold is closed, the zones 22A1, 22A2, 22B1, 22B2 are pressed between the nip surfaces 32A1, 32A2, 32B1, 32B2. In order to facilitate the sliding of the metal bodies 14A, 14B with respect to the nip surfaces 32A1, 32A2, 32B1, 32B2 during stamping, the nip surfaces also include a Teflon coating.

Then, the edges 20A1, 20A2, 20B1, 20B2 and the cohesion surfaces 24A1, 24A2, 24B1, 24B2 are positioned in the molding space E using the means 40.

To do this, the pistons 42 are then moved from their retracted position to their biasing position. The pistons 42 then urge the metal bodies 14A, 14B so as to center them in the molding space E. Then, in this case, the plastic is injected into the molding space E. The plastic material may in particular be a thermoplastic polymer, optionally reinforced, such as polypropylene or polyamide. The plastic material may also be derived from a thermosetting resin of the AMC or BMC type (abbreviations for the English expressions Advanced Molding Compound and BuIk Molding Compound).

During the hardening of the plastic material, either by heating in the case of a thermosetting resin or by cooling in the case of a thermoplastic polymer, the edges 20A, 20B are maintained with the pistons 42. This prevents that, under the the effect of the injection pressure, the edges 20A, 20B and / or the cohesive surfaces 24A1, 24A2, 24B1, 24B2 are pressed against one or the other of the molding surfaces 36, 38.

After cooling the mold, the pistons 42 are retracted so as to be able to eject the assembly 12. In a variant, the pistons 42 are retracted before complete hardening of the plastic material, which makes it possible to avoid leaving an impression in the common body 16 made of plastic There is shown in Figure 5, a floor 62 for a motor vehicle comprising a hybrid part according to a third embodiment. In this figure and those which follow, elements similar to those shown in the preceding figures are designated by identical references.

The metal body 14A includes orifices 64A, 64B formed on stamping lines 65A, 65B. Each orifice has a generally slot shape so that the drawing lines 65A, 65B form dashed outlines of the stamped portions 66A, 66B.

The cohesive portion P also has cohesive orifices 66. The plastic body 16 extends through the orifices 66 and connects the cohesive surfaces 24A1, 24A2, 24B1, 24B2 to one another.

FIGS. 6 and 7 show a mold according to a second embodiment of the invention.

In this embodiment, the portion 28 comprises two tanks 68A, 68B disposed on either side of a slot 69. The portion 30, complementary to the portion 28 comprises two slots 7OA, 7OB and a tank 71. The mold 10 comprises, in contrast to the first embodiment, cutting means 72. In the present case, the cutting means 72 comprise a cutting edge 73.

As shown in Figure 6, the metal body 14A and 14B are interconnected by a metal body 14C to form the metal body 14. In this case, the metal body 14C is connected to each metal body 14A and 14B by a zone of necking

74A, 74B. Alternatively, the metal body 14 may comprise orifices having a general slot shape delimiting the portion 14C portions 14A and 14B in a dotted outline forming a tear line of the metal body.

The mold 10 according to the second embodiment of the invention makes it possible to implement a method according to a second embodiment of the invention, the particularities of which will be specified below.

When closing the mold 10, the magnetic fastening means 6OA, 6OB now respectively the metal body 14A, 14B, the slot 69 exerts a force on the metal body 14C. The metal body is then separated into three secondary metal bodies 14A, 14B, 14C by tearing the necking zones 74A, 74B. In addition, the metal body 14B is cut using the cutting means 72.

During the injection of the plastic material, the body 14C is maintained, preferably by the positioning means 40. The body 14C locally reinforces the body 16 made of plastic material.

The invention is not limited to the embodiments previously described above.

Indeed, it will also be possible to perform compression molding.

Claims

A method of manufacturing a hybrid part (14A, 14B) for a motor vehicle in a mold (10), the part (12A, 12B) comprising a metal body (14A, 14B) and a plastic body (16). partially covering the metal body (14A, 14B), the metal body (14A, 14B) comprising first and second opposed surfaces (18A1, 18A2, 18B1, 18B2), the first and second opposed surfaces (18A1, 18A2, 18B1, 18B2) respectively comprising first and second clear areas (22A1, 22A2, 22B1, 22B2) of the plastic material, the mold (10) comprising first and second portions (28, 30) movable relative to each other between open and closed positions of the mold (10), and between which the metal body (14A, 14B) is placed, in which the zones (22A1, 22A2, 22B1, 22B2) of the metal body (14A) are enclosed , 14B) intended to be clear of plastic between first and second gripping surfaces (32A1, 32A2, 32B1, 32B2) carried respectively by the first and second portions (28, 30) of the mold (10), characterized in that the zones (22A1, 22A2, 22B1, 22B2) clamped between the pinch surfaces (32A1, 32A2, 32B1, 32B2) of the mold (10) when closing the mold (10). 2. Method according to claim 1, wherein, the metal body (14A, 14B) having an edge (20A, 20B) connecting together cohesion surfaces (24A1, 24A2, 24B1, 24B2) of opposite surfaces, the edge (2OA). 20B) and the cohesion surfaces (24A1, 24A2, 24B1, 24B2) being intended to be overmoulded by the plastic body (16), the edge (20A, 20B) and the cohesion surfaces (24A1, 24A2) are positioned. , 24B1, 24B2) in a molding space (E) of the plastics material. 3. Method according to claim 2, wherein the edge (20A, 20B) is folded with respect to the zones (22A1, 22A2, 22B1, 22B2) intended to be clamped between the gripping surfaces (32A1, 32A2, 32B1, 32B2). preferably before closure of the mold (10). A method according to any one of the preceding claims, wherein the metal body (14A, 14B) is fixed to one of the nip surfaces (32A1, 32A2, 32B1, 32B2). 5. Method according to any one of the preceding claims, wherein the metal body (14) is separated into at least two metal bodies. secondary members (14A, 14B, 14C) by moving the first and second portions (28, 30) of the mold (10) to the closed position of the mold (10). 6. Mold (10) for manufacturing a hybrid part (12A, 12B) for a motor vehicle, the part (12A, 12B) comprising a metal body (14A, 14B) and a body of plastic partially covering the body metal body (14A, 14B), the metal body (14A, 14B) comprising first and second opposed surfaces (18A1, 18A2, 18B1, 18B2), the first and second opposed surfaces (18A1, 18A2, 18B1, 18B2) respectively comprising first and second clear areas (22A1, 22A2, 22B1, 22B2) of the plastic material, the mold (10) comprising first and second portions (28, 30), between which the metal body (14A, 14B) is intended to be placed, movable relative to each other between open and closed positions of the mold (10), the first and second portions (28, 30) respectively having first and second nip surfaces (32A1, 32A2 , 32B1, 32B2), intended to come into contact with the first first and second surfaces (18A1, 18A2, 18B1, 18B2) of the metal body (14A, 14B), characterized in that at least one of the first or second pinch surfaces (32A1, 32A2, 32B1, 32B2) comprises means for stamping the unobstructed areas (22A1, 22A2, 22B1, 22B2). 7. Mold (10) according to claim 6, comprising means for positioning an edge (20A, 20B) of the metal body (14A, 14B) in a molding space (E) of the plastic material. 8. Mold (10) according to claim 7, wherein the positioning means (40) of the edge (20A, 20B) of the metal body (14A, 14B) are movable between: a retracted position in which the positioning means (40 ) are not in contact with the metal body (14A, 14B), and a biasing position of the metal body (14A, 14B) in the molding space in which the positioning means (40) are in contact with the body metal (14A, 14B). The mold (10) according to any one of claims 6 to 8, wherein at least the first and second nip surfaces (32A1, 32A2, 32B1, 32B2) have a coating or are surface treated, the coating or the surface treatment being preferably of the low friction type. 10. Mold (10) according to any one of claims 6 to 9, comprising fixing means (6OA, 60B) of the metal body (14A, 14B) adapted to fix the metal body (14A, 14B) on one of the surfaces nip (32A1, 32A2, 32B1, 32B2), preferably magnetic means. 1 1. Hybrid part (12A, 12B) for a motor vehicle manufactured by a method according to any one of claims 1 to 4, characterized in that the first and second free zones (22A1, 22A2, 22B1, 22B2) of material comprise at least one stamped area (26A, 26B). Hybrid part (12A, 12B) according to claim 11, wherein the metal body (14A, 14B) is overmolded by the plastic body on an edge (20A, 20B) and on cohesion surfaces (24A1, 24A2, 24B1, 24B2) interconnected by this edge (20A, 20B), the plastic body (16) interrupting in the first and second clear areas (22A1, 22A2, 22B1, 22B2). 13. Hybrid part (12A, 12B) according to claim 11 or 12, wherein the plastic body (16) covers the entire edge (20A, 20B) surrounding the metal body (14A, 14B). 14. Part (12A, 12B) according to claim 12 or 13, wherein the edge (20A, 20B) is folded relative to the first and second clear areas (22A1, 22A2, 22B1, 22B2) of plastic. 15. Part (12A, 12B) according to any one of claims 11 to 14, wherein the metal body (14A, 14B) has orifices (64, 66) connecting the opposite surfaces (18A1, 18A2, 18B1, 18B2). .