FR2975630A1 - Device for connecting part manufactured by molding or injection with/on element, has deformable section longitudinally deforming as constitutive material of deformable section radially creeps under effect of longitudinal compressive force - Google Patents

Abstract

The device (1) has a tubular section (3) arranged along longitudinal direction (I-I) and provided with a connection unit (4) to authorize connection of a part with/on element. A tubular deformable section (5) extends from the tubular section and longitudinally deforms as a constitutive material of the deformable section radially creeps under effect of longitudinal compressive force without damaging the connection unit. The connection unit is formed with a cylindrical smooth internal hole (19). A flange extends radially away from the longitudinal direction. Independent claims are also included for the following: (1) a mold for manufacturing a part by molding or injection (2) a method for manufacturing a part by molding or injection.

Description

The present invention relates to a connecting device intended to be inserted by overmoulding in a part manufactured by molding or injection molding. In order to allow the connection of a part manufactured by molding or injection molding, made of plastic for example, it is known to provide a reinforced connection zone of this part by means of a connecting device intended to be inserted by overmolding. In known manner, such a connecting device is in a general shape developing in a longitudinal direction, and is shaped to allow the connection of said manufactured part by molding or injection to or on another element. For example, the connecting device may be in tubular form provided with internal connecting means may for example consist of an internal thread for cooperating with a fixing screw. During the manufacture of the part by molding or by injection, the connecting device is inserted into a mold comprising at least two mold parts intended to be brought closer in a direction of approach for closing said mold. The connecting device is then previously arranged in the mold and oriented with its longitudinal direction oriented substantially parallel to the direction of approximation of the mold parts. In order to prevent any infiltration of molding material or injection into the connection means during the molding or injection process, it is necessary for the connecting device to have, in the longitudinal direction, a length equal to that of the cavity formed in the mold in which it is installed, so that the mold parts come into sealing contact against the connecting device and thus confine the connecting means in a volume where can not penetrate the injected or molded material. However, the manufacturing tolerances of the mold, but also the manufacturing tolerances of the connecting devices, lead to situations where the connecting device is either too short or too long. When the connecting device is too short, the material injected into the mold, such as a plastic material, enters the connecting means, rendering the latter unusable. When the connecting device is too long, there is a crushing thereof when bringing the mold parts closer when the mold is closed. The crushing of the connecting device, which causes deformation of the connecting means, if necessary, may make it impossible to connect with any other element to be linked.

5877FDEP.docx 2975630 2 When the connecting device has been rendered unusable by deformation and / or by penetration of molding or injection material into the connecting means, the entire manufactured part is most often out of use. use. Since each manufactured part generally comprises a plurality of connecting devices, the occurrence of defects is high, which results in significant financial losses. A first problem proposed by the invention is to limit the risk of damage to the connecting device, and if necessary its connecting means, during manufacturing operations by molding or injection of the part 10 to be provided with such a connecting device. Simultaneously, the present invention aims to improve the strength of a connection device in the part to be manufactured by molding or injection. To achieve these objects, as well as others, the invention proposes a connecting device intended to be inserted by overmolding in a part manufactured by molding or injection, comprising a first section developing in a longitudinal direction and provided with means for link to allow the connection of said part to or on another element, characterized in that it comprises at least one deformable section devoid of connecting means and extending said first section in the longitudinal direction, and in that said deformable section is Longitudinally deformable in that its constituent material can flow radially under the effect of a longitudinal compressive force without damaging the connecting means of the first section. By "damage to the connecting means" is meant a geometric deformation of the connecting means or an alteration of the connecting means by adhesion of material injected or molded to them rendering them unusable. By choosing a length of connection device in the longitudinal direction greater than the longitudinal dimension provided in the corresponding cavity formed in the mold, it is certain that there will be a slight crushing of the connecting device under the effect of an effort. longitudinal compression. This ensures firstly that the connecting device remains in perfect contact with the two mold parts, which contact is sufficiently sealed to prevent penetration of molding material or injection in the connecting means. This then ensures that, when the longitudinal compression force is applied, the connecting device is deliberately deformed in the only predetermined zone corresponding to the deformable section which can be deformed without this being detrimental. the functionality of the connecting device and its connecting means. The deformation of the deformable section by radial creep of its constituent material makes it possible to prevent damage to the connection means of the first section, so that these are not affected by the application of the longitudinal compression force induced by the closure of the mold. After a radial outward flow, the deformable section deformed constitutes a radial shoulder engaged in the material constituting the part manufactured by molding or injection, which shoulder is opposed to any attempt to separate the manufactured part and the connecting device by applying a relative traction force applied in a given direction along the longitudinal direction. Preferably, the first section and / or said at least one deformable section may be tubular.

In a first embodiment of the invention, the connecting means of the first section may comprise a smooth cylindrical internal bore. The first section may thus allow the realization of a slide connection, pivot or pivot-sliding of the manufactured part with another element. In a second embodiment of the invention, the connecting means may comprise an internal bore with an internal thread allowing the connection of the workpiece to or on another element, whereas the said at least one deformable section is devoid of means of connection. link. Said internal thread is intended to cooperate with a fixing screw. No deformation of the internal thread occurs when the longitudinal fastening force is applied by the closing of the mold, the external thread of the fastening screw is ensured to cooperate with the thread of the internal thread which is preserved. Advantageously, said at least one deformable section may have a wall thickness less than the wall thickness of the first section. A deformable section is thus produced in a simple, economical and reliable manner so that it is deformed in priority by the application of the longitudinal compression force. In another embodiment of the invention, the connecting means may be external and may preferably comprise a longitudinal rod 35 with external thread. Preferably, the connecting device may comprise a non-circular outer cross section over at least part of its length. Such a form of external cross-section makes it possible to limit the risks of separation of the molded or injected part from the connection device when a torque is applied, caused for example by the tightening of an element. corresponding thread on the threaded connection means of the first section.

Advantageously, the connecting device may comprise two deformable sections extending the first section in the longitudinal direction. When closing the mold, one and / or two deformable sections deform. When the two deformable sections have deformed by radial creep, the connecting device is then provided with two radial shoulders 10 of opposite orientations, which shoulders are engaged in the constituent material of the part manufactured by molding or injection. These shoulders effectively oppose any attempt to separate the manufactured part and the connecting device by applying a relative tensile force applied in the longitudinal direction and in the two possible directions of application.

Preferably, the connecting device may comprise at least one flange extending radially away from the longitudinal direction. Said flange may be provided to undergo no deformation during the application of the longitudinal application force or may, on the contrary, constitute itself a deformable section for flowing radially under the effect of the effort of 20 longitudinal compression. Advantageously, the first section may comprise an external groove or an external rib. Said groove or rib makes it possible to increase the retention of the connection device in the constituent material of the part manufactured by molding or injection against a tensile force applied applied along the longitudinal direction. According to another aspect, the invention proposes a mold for manufacturing a part manufactured by molding or injection, comprising a first mold part and a second mold part intended to be brought closer together in a direction of approach for closing said mold. ; According to the invention, the mold comprises positioning means shaped to receive and hold at least one connecting device as described above, with the longitudinal direction substantially parallel to the direction of approach of the first and second mold parts. The positioning means permit reliable holding and orientation of the connecting device to promote a predetermined and suitable deformation of said at least one deformable section.

Advantageously, said at least one deformable section may be tubular and the positioning means may comprise a cylindrical lug extending from a mold wall and having an outer diameter allowing it to receive the connecting device by fitting said 5 tubular deformable section. Preferably, the cylindrical lug may extend along a length less than the length of the deformable section. By providing a sufficient length of deformable section, the cylindrical lug does not conflict with the first section and, where appropriate, with the connecting means during the deformation of the deformable section. Advantageously, the cylindrical lug may comprise, at its base connecting to the wall of the mold, a gradual widening of its cross section towards the mold wall. The base of the lug promotes the radial flow of the constituent material of the deformable section by guiding it during its deformation.

According to another aspect of the invention, there is provided a method of manufacturing a part by molding or injection, comprising the following steps: a) providing a connecting device intended to be inserted by overmoulding into said part to be manufactured, comprising a first section developing in a longitudinal direction and provided with connecting means to allow the connection of said piece to or on another element, said connecting device comprising at least one deformable section devoid of connecting means and extending said first section in the longitudinal direction, said deformable section being deformable longitudinally in that its constituent material can flow radially under the effect of a longitudinal compressive force without damaging the connection means of the first section, b) provide a mold having a first mold part and a second mold part intended to be brought together in a direction of approach for closure of said mold, said mold having positioning means shaped to receive and hold said connecting device with the longitudinal direction substantially parallel to the direction of approach of the first and second mold parts, c) positioning the connecting device in the mold by means of the positioning means, d) closing the mold by bringing the first and second mold parts together, e) introducing the material constituting the part to be manufactured into the mold, in which during step d), the closing of the mold induces an axial longitudinal compressive force causing a radial flow of the material constituting the said at least one deformable section without damage to the connecting means of the first section . Other objects, features and advantages of the present invention will become apparent from the following description of particular embodiments, with reference to the accompanying figures, in which: FIG. 1 is a perspective view of a first embodiment of embodiment of connecting device according to the invention - Figure 2 is a longitudinal sectional view of the connecting device of Figure 1 10 - Figure 3 is a longitudinal sectional view of a second embodiment of connecting device according to the invention; - Figures 4 to 9 illustrate the successive steps of manufacturing by molding or injection of a part to be provided with the connecting device of Figure 2; FIG. 10 is a longitudinal section of a third embodiment of a connecting device according to the invention; FIG. 11 is a partial section of a part manufactured by molding or injection and provided with the connecting device of FIG. 10; FIG. 12 is a longitudinal section of a fourth embodiment of connecting device according to the invention; FIG. 13 is a partial section of a part manufactured by molding or injection and provided with the connecting device of FIG. 12; FIG. 14 is a perspective view of a fifth embodiment of a connecting device according to the invention; FIG. 15 is a perspective view of a sixth embodiment of a connecting device according to FIG. FIG. 16 is a side view of a seventh embodiment of a connecting device according to the invention; and FIG. 17 is a view in longitudinal section of a mold during the manufacture of a part intended to be provided with the connecting device of FIG. 16.

Figures 1 to 17 illustrate seven particular embodiments of the connecting device according to the invention. In Figures 1 to 3, 10, 12, 14, 15 and 16, there is shown a connecting device 1 intended to be inserted by overmoulding in a part 2 (Figures 9, 11 and 13) manufactured by molding or injection. The connecting device 1 comprises a first section 3 developing in a longitudinal direction I-I and provided with connecting means 4 to allow the connection of said part 2 to or on another element. The connecting device 1 further comprises a tubular deformable section extending said first section 3 in the longitudinal direction I-I. The deformable section 5 is deformable longitudinally in that its constituent material can flow radially away from the longitudinal direction II under the effect of a longitudinal compression force without deforming the connecting means 4 of the first section 3. In Figures 1 to 3, 10, 12, 14 and 15, the connecting device 1 has a substantially tubular general external shape with a first tubular section 3 and at least one tubular deformable section. In the first embodiment illustrated in FIGS. 1 and 2, the linking means comprise a smooth cylindrical internal bore 19. When the smooth cylindrical inner bore 19 has a circular cross section, the connecting device 1 provides a pivot connection or pivot-sliding with another element. When the cylindrical inner surface 19 has a non-circular cross-section, the connecting device 1 makes it possible to carry out a sliding connection with another element slidably disposed through the connecting device 1. The internal bore 19 is open but can alternatively be one-eyed. The second embodiment illustrated in FIG. 3 differs from the first embodiment in that the first section 3 is provided with connecting means 4 with internal bore 19 with internal threading 6 allowing the attachment of the part 2 manufactured by molding or injection to or on another element. The deformable section 5 is devoid of connection means 4. The internal bore 19 is open but may alternatively be blind. The internal threading 6 is intended to cooperate with a fastening screw 25 (not shown) with an external thread and the same thread as the internal thread 6. The connecting device 1 makes it possible to make a screw connection of the part 2 to be manufactured with a other element. In order to allow a radial creep of the constituent material of the deformable section 5 before the first section 3 and its connecting means 30 4 are deformed, we see more particularly in FIGS. 1 to 3, 10, 12, 14, 15 and 16 that the deformable section 5 has a wall thickness and less than the wall thickness e2 of the first section 3. In the third embodiment illustrated more particularly in FIGS. 10 and 11, the connecting device 1 comprises, at a distance of end without a deformable section, a flange 7 extending radially away from the longitudinal direction II. FIG. 11 more particularly shows that the flange 7 makes it possible to oppose any attempt to separate the connection device 1 and the component 2 by the application of a relative longitudinal separation effort schematized by the arrow 8, while the deformable section 5, after deformation by radial creep, makes it possible to oppose any relative longitudinal force of separation schematized by the arrow 9.

It should be pointed out that the flange 7 may itself be a longitudinally deformable section intended to flow radially under the effect of a longitudinal compressive force. In the fourth embodiment illustrated in Figures 12 and 13, the connecting device 1 comprises two deformable sections 5 and 5 'extending the first section 3 on either side in the longitudinal direction I-I. After deformation by radial creep of each of the deformable sections 5 and 5 ', the connecting device 1 overmolded in the part 2 is as shown in Figure 13. In this figure, we see that each of the deformable sections 5 and 5 having radially fluted constitutes a shoulder engaged in the material constituting the part 2. The deformable deformed sections 5 and 5 'thus limit any risk of separation of the connecting device 1 and the part 2 by the application of a relative longitudinal force of separation exerted in one or other of the directions illustrated by the double arrow 10. Alternatively or in addition, it can be provided, as illustrated in the sixth embodiment of the invention shown in FIG. Figure 15, a first section 3 provided with one or more external grooves 11a and 11b. The external grooves 11a and 11b effectively oppose any attempt to separate the connecting device 1 and the part 2 shown diagrammatically by the double arrow 10 of FIG. 13.

As an alternative to or in addition to external grooves 11a and 11b, it is also possible for the first section 3 to have one or more external ribs. In order to limit the risks of separation and rotational drive of the connecting device 1 with respect to the part 2, it is provided, as illustrated in FIGS. 14 and 15 illustrating the fifth and sixth embodiments, that the device of FIG. link 1 has a non-circular outer cross-section over at least part of its length along the longitudinal direction II. In Figure 14 illustrating the fifth embodiment of the invention, the connecting device 1 comprises a first section 3 of hexagonal outer cross section. The sixth embodiment of the invention illustrated in FIG. 15 comprises a first section 3 and a deformable section 5 with a serrated outer surface.

In the seventh embodiment of the invention, illustrated in Figures 16 and 17, the connecting device 1 is provided with external connecting means 4 allowing the attachment of the manufactured part by molding or injection to or on another element. In this case, the external connecting means 4 comprise a longitudinal rod 24 with external thread 20. In this embodiment, the connecting device 1 is in the general form of a screw provided with a head T1 and of a T2 stem. Only the T1 head is intended to be overmolded in the constituent material of the part manufactured by molding or injection. The rod T2 is intended to protrude out of the part manufactured by molding or injection to allow the connection of the part to or on another element. The head Ti is provided on its outer lateral surface with external longitudinal grooves 21 which, once in engagement with the material constituting the part to be manufactured, effectively oppose any attempt to separate the connecting device 1 and the the piece by the exercise of a relative longitudinal force of separation exerted in one or other of the directions illustrated by the double arrow 22 and against any detachment in rotation of the connecting device 1 relative to the piece caused for example by the application of an excessive tightening torque on the longitudinal rod 24 with external threading 20.

The connecting device 1 according to the invention is particularly intended to be used in cooperation with a manufacturing mold 12 for the manufacture of the part 2 by molding or injection. Such a mold 12 is illustrated in FIGS. 4 to 8 and 17. It is more particularly seen in FIGS. 4, 5 and 17 that the mold 12 comprises a first mold part 12a and a second mold part 12b intended to be brought closer together. in a direction of approach II-II for closing said mold 12. The mold 12 comprises positioning means 13 shaped to receive and hold at least one connecting device 1 according to any one of the embodiments of the invention with the longitudinal direction II substantially parallel to the direction of approach II-II of the first and second mold portions 12a and 12b. In the present case, in FIGS. 4 and 5, the positioning means 13 comprise a cylindrical lug 14 extending from a mold wall 15 and having an outside diameter D1 enabling it to receive the connecting device 1 by press fitting. a deformable section 5 tubular. More specifically, the deformable section 5 comprises an internal bore of diameter D2 greater than the outer diameter D1 of the cylindrical lug 14.

In order to better guide the constituent material of the deformable section 5 during its radial creep, the cylindrical lug 14 comprises, at its base connecting it to the wall 15 of the mold 12, a progressive enlargement 16 of its cross-section. towards the mold wall 12.

In order to prevent deformation of the internal connecting means 4 (internal thread 6) by the cylindrical lug 14, provision is made for the cylindrical lug 14 to extend along a length L1 less than the length L2 of the deformable section 5. In FIG. 17, the positioning means comprise a hole 23 intended to receive the rod T2 of the connecting device 1. The head Ti of the connecting device 1 comes to bear against the wall 15 of the mold 12 according to a face of FIG. shoulder 18. The use of the mold 12 for the manufacture by molding or injection of a part 2 provided with a connecting device 1 according to the second embodiment of the invention will now be explained using FIGS. to 9.

Initially, the mold 12 is opened with its mold parts 12a and 12b arranged one away from the other in the direction of approach II-II (Figure 4). A connecting device 1 is then positioned in the mold 12 by means of the positioning means 13. In this case, the deformable section 5 is fitted on the cylindrical pin 14 as illustrated in FIG. 5. The longitudinal direction 20 It is thus parallel to the direction of approach II-II. The mold parts 12a and 12b are then brought closer in the direction of approach II-II to close the mold 12. During this closing movement, the first mold part 12a comes into contact with the connecting device 1 (Figure 6).

The closure of the mold 12 is then continued by the application of a force of approaching the first and second mold parts 12a and 12b which induces a longitudinal compressive force in the connecting device 1. The deformable section 5 then deforms radially by radial creep of its constituent material until the complete closure of the mold 12. It is then in the situation illustrated in Figure 7. Due to its short length L1 the cylindrical lug 14 does not come, in the end closing the mold 12, in contact with the connecting means 4. The first section 3 and the connecting means 4 are not deformed by the presence of the cylindrical pin 14. The material constituting the part 2 to be manufactured is then injected or pressed into the mold 12 so as to fill the entire free space between the mold parts 12a and 12b (FIG. 8) around the connecting device 1.

When the constituent material of the part 2 to be manufactured is introduced, the material does not penetrate inside the connecting device 1 which is in sealing contact at each of its ends with the first and second ends. mold parts 12a and 12b.

After solidification of its constituent material, the part 2 is demolded and is then in the form illustrated in Figure 9. The deformable section 5 deformed constitutes a shoulder engaged in the constituent material of the part 2 and retains the connecting device 1 in the piece 2 against the relative tensile force illustrated by the arrow 17.

The use of the mold 12 for the manufacture by molding or injection of a part 2 provided with a connecting device 1 according to the first, third, fourth, fifth and sixth embodiments of the invention is similar to that described. in relation to the second embodiment of the invention. With regard to the seventh embodiment, FIG. 17 corresponds to the step illustrated in FIG. 6 previously described. During the complete closure of the mold 12, a longitudinal compression force is induced in the connecting device 1 and the deformable section 5 then deforms radially by radial creep of its constituent material until the complete closure of the mold 12. the deformation of the deformable section 5, the first section 3 and the external connecting means 4 (longitudinal rod 24 with an external thread 20) are not damaged. In particular, the sealing contact of the shoulder face 18 with the mold wall 15 makes it possible to seal the connection means 4 in the hole 23, which prevents damage to the connection means 4 by injection or molding of the injected or molded material 25 in the external thread 20. The hole 23 constitutes positioning means of the connecting device 1 in the mold 12. The connecting device 1 of Figures 16 and 17 may comprise, as an alternative to or in addition to the deformable section 5, a deformable section provided in the area of the shoulder face 18.

In the present description, the term "tubular" is intended to mean a hollow solid provided with a wall with a sealed external lateral surface and thus devoid of light, so that the material constituting the part to be produced in the mold can not penetrate inside the hollow solid, and if necessary in the connecting means 4, during molding or injection.

In FIGS. 1 to 17, the first section 3 and the deformable sections 5 and 5 'are substantially cylindrical. These, however, may have different external shapes of a perfect cylinder always extending in the longitudinal direction I-I. In Figures 7 to 9, 11 and 13, the radial flow of the constituent material of the deformable section 5 or 5 'is a gradual widening from the first section 3 towards the end of the deformable section 5 or 5'. However, it is possible to cause a different radial creep, for example by providing for radial creep of the deformable section 5 or 5 'along only part of its length and / or without deforming the free end of the deformable section 5 or 5'.

The present invention is not limited to the embodiments which have been explicitly described, but includes the various variants and generalizations thereof within the scope of the claims below.

5877FDEP.docx

Claims (16)

CLAIMS1 - Connecting device (1) intended to be inserted by overmolding in a part (2) manufactured by molding or injection, comprising a first section (3) developing in a longitudinal direction (II) and provided with connecting means (4). ) to allow the connection of said part (2) to or on another element, characterized in that it comprises at least one deformable section (5, 5 ') devoid of connection means (4) and extending said first section ( 3) in the longitudinal direction (II), and in that said deformable section (5, 5 ') is deformable longitudinally in that its constituent material can flow radially under the effect of a longitudinal compression force without being damaged the connection means (4) of the first section (3). 2 - Connecting device (1) according to claim 1, characterized in that the first section (3) and / or said at least one deformable section (5, 5 ') are tubular. 3 - Connecting device (1) according to claim 2, characterized in that the connecting means (4) comprise a cylindrical internal bore (19) smooth. 4 - Connecting device (1) according to claim 2, characterized in that the connecting means (4) comprise an internal bore (19) with internal thread (6). 5 - Connecting device (1) according to any one of claims 2 to 4, characterized in that said at least one deformable section (5, 5 ') has a wall thickness (el) less than the wall thickness (e2) of the first section (3). 6 - Connecting device (1) according to one of claims 1 or 2, characterized in that the connecting means (4) are external. 7 - Connecting device (1) according to claim 6, characterized in that the connecting means (4) comprise a longitudinal rod (24) with external thread (20). 8 - Connecting device (1) according to any one of claims 1 to 7, characterized in that it comprises a non-circular outer cross section over a portion at least of its length. 9 - Connecting device (1) according to any one of claims 1 to 8, characterized in that it comprises two deformable sections (5, 5 ') extending the first section (3) in the longitudinal direction (I-I). 10 - Connecting device (1) according to any one of claims 1 to 9, characterized in that it comprises at least one flange (7) extending radially away from the longitudinal direction (I-I). 5877FDEP.docx 2975630 14 11 - Connecting device (1) according to any one of claims 1 to 10, characterized in that the first section (3) comprises an outer groove (11a, 11b) or an outer rib. 12 - Mold (12) for manufacturing a workpiece (2) made by molding or injection, comprising a first mold part (12a) and a second mold part (12b) intended to be brought closer together in a direction of approximation (II-II) for closing said mold (12), characterized in that it comprises positioning means (13) shaped to receive and hold at least one connecting device (1) according to any one of claims 1 at 11 with the longitudinal direction (II) substantially parallel to the direction of approach (II-II) of the first and second mold parts (12a, 12b). 13 - Mold (12) according to claim 12, characterized in that said at least one deformable section (5, 5 ') is tubular and in that the positioning means (13) comprise a cylindrical lug (14) extending from a wall (15) of mold (12) and having an outer diameter (Dl) allowing it to receive a connecting device (1) by fitting a deformable section (5) tubular. 14 - Mold (12) according to claim 13, characterized in that the cylindrical pin (14) extends along a length (L1) less than the length (L2) of the deformable section (5). 15 - Mold (12) according to one of claims 13 or 14, characterized in that the cylindrical pin (14) comprises at its base connecting the wall (15) of the mold (12), a widening (16 ) progressive of its cross section towards the wall (15) of mold (12). 25 16 - Method for manufacturing a part (2) by molding or injection, comprising the following steps: a) providing a connecting device (1) intended to be inserted by overmolding into said part (2) to be manufactured, comprising a first section (3) developing in a longitudinal direction (II) and provided with connecting means (4) for enabling the connection of said workpiece (2) to or on another element, said connecting device (1) comprising at least a deformable section (5, 5 ') devoid of connecting means (4) and extending said first section (3) in the longitudinal direction (II), said deformable section (5, 5') being deformable longitudinally in that its The constituent material can flow radially under the effect of a longitudinal compressive force without damaging the connecting means (4) of the first section (3). b) providing a mold (12) comprising a first mold part (12a ) and a second mold part (12b) intended to be brought closer together in a direction of approach (II-II) for closing said mold (12), said mold (12) comprising positioning means (13) shaped to receive and holding said connecting device (1) with the longitudinal direction (II) substantially parallel to the direction of approach (II-II) of the first (12a) and second (12b) mold parts, c) positioning the connecting device ( 1) in the mold (12) by means of the positioning means (13), 10 d) closing the mold (12) by bringing the first (12a) and second (12b) mold parts together, e) introducing the material constituting the piece (2) to be produced in the mold (12), in which, during step d), the closing of the mold (12) induces an axial longitudinal compression force causing a radial creep of the constituent material 15 of said at least one deformable section (5, 5 ') without damaging the connecting means on (4) of the first section (3).