FR3053269A1 - DEVICE FOR EJECTING A PIECE FORMED ON A MOLD PART AND ASSOCIATED TOOL - Google Patents

Abstract

The present invention relates to an ejection device (22) for a part (4) formed on a mold part (20), comprising: - an ejection element (26) movable in translation relative to the mold part (20) in a direction of ejection (A), - a shim (28) movable in translation relative to the mold part (20) in a direction of travel (B), different from the direction of ejection (A). ). The ejection device (22) has at least one drive configuration in which the displacement of the ejection element (26) in the ejection direction (A) causes the shim (28) to move in accordance with the deflection direction (B), and an unobstructed configuration in which the shim is not caused by the displacement of the ejection element in the ejection direction (A).

Description

© Publication no .: 3,053,269 (to be used only for reproduction orders)

©) National registration number: 16 56253 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE © Int Cl ⁸ : B 29 C 33/48 (2017.01), B 29 C 45/44

A1 PATENT APPLICATION

©) Date of filing: 30.06.16. © Applicant (s): FAURECIA INTERIEUR INDUSTRIE (© Priority: Simplified joint stock company - FR. @ Inventor (s): BELLIARD SYLVAIN. ©) Date of public availability of the request: 05.01.18 Bulletin 18/01. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ® Holder (s): FAURECIA INTERIEUR INDUSTRIE related: Joint stock company. ©) Extension request (s): (© Agent (s): LAVOIX.

VX) DEVICE FOR EJECTING A PART SHAPED ON A MOLD PART AND ASSOCIATED IMPLEMENTATION TOOL.

FR 3 053 269 - A1 _ The present invention relates to a device for ejecting (22) a part (4) formed on a mold part (20), comprising:

an ejection element (26) movable in translation relative to the mold part (20) in an ejection direction (A),

- A wedge (28) movable in translation relative to the mold part (20) in a direction of movement (B), different from the direction of ejection (A).

The ejection device (22) has at least one drive configuration in which the displacement of the ejection element (26) in the direction of ejection (A) causes the displacement of the shim (28) according to the travel direction (B), and a clear configuration in which the shim is not driven by the movement of the ejection element in the ejection direction (A).

Device for ejecting a part formed on a mold part and associated production tool

The present invention relates to a device for ejecting a part formed on a mold part, comprising an ejection element movable in translation relative to the mold part in an ejection direction between a retracted position and a position d ejection, and a shim movable in translation relative to the mold part in a direction of movement, different from the direction of ejection, between a retracted position and an ejection position.

The invention also relates to a tool for producing a part comprising such an ejection device.

Such a production tool is, for example, an injection mold in which a molded part can be produced by injecting a molding material into a molding cavity having the shape of the part to be produced.

In such a tool, provision is made to facilitate the removal of the part formed from the tool by means of an ejection device moving the part out of the molding cavity to make the part accessible. In addition, when the part has an undercut zone formed by a mold part on a block, the undercut zone must also be released from the block when the part is removed from the mold. However, the direction of movement of the shim out of the undercut area is different from the direction of ejection in which the ejection element moves the part to separate it from the mold part, which can pose difficulties in the arrangement of the structure of the ejection device.

It is known to control, by separate rods, the movement of the shim having the mold part forming the undercut area and the movement of the ejection element to allow these two demolding steps. This can lead to increasing the thickness of the mold to allow the actuation of each rod. Such a tool therefore requires the use of a large injection molding machine for operating the mold.

One of the aims of the invention is to overcome this drawback by proposing an ejection device allowing both the withdrawal of the formed part and the clearance of the undercut area while having a reduced bulk in thickness.

To this end, the invention relates to an ejection device of the aforementioned type in which the ejection device has at least one drive configuration in which the displacement of the ejection element in the direction of ejection causes the displacement of the shim in the direction of travel, and a clear configuration in which the shim is not driven by the displacement of the ejection element in the ejection direction.

The wedge and the ejection element being linked over part of the stroke of the ejection element, the demolding of the undercut zone is facilitated by the synchronization of the displacements. In addition, the shim not being driven over the entire stroke of the ejection element, the space required for the stroke of the shim is reduced.

According to other characteristics of the ejection device according to the invention:

- the wedge comprises a protuberance and the ejection element defines a housing, the protuberance being received in the housing in the drive configuration, and the protuberance being outside the housing in the disengaged configuration.

- The housing is limited by at least one lower shoulder, the lower shoulder being able to abut against the protuberance in a drive configuration so as to cause the displacement of the wedge in the direction of movement towards the position of ejection when the ejection member moves in the ejection direction to the ejection position.

- The housing is limited by at least one upper shoulder, the upper shoulder being able to abut against the protuberance in a drive configuration so as to cause the displacement of the wedge in the direction of movement towards the retracted position when the ejection element moves in the ejection direction to the retracted position.

- the direction of travel forms an angle between 1 ° and 15 ° with the direction of ejection.

- The ejection device comprises a slide extending in the mold part in the direction of travel, the wedge being mounted movable in translation along the direction of travel along the slide.

- when the ejection element and the shim are in the retracted position, the first mold part, the ejection element and the shim define a forming cavity, of shape complementary to part of the part.

- the shim comprises a molding part of at least one region undercut from the formed part, the direction of movement being such that during the displacement of the shim from the retracted position to the ejection position, the molding part moves out of said area undercut.

The invention also relates to a tool for producing a part comprising a first mold part, a second mold part and an ejection device as previously described, a main molding cavity being defined by a molding surface. of the first mold part and a molding surface of the second mold part to form a main surface of the part, and a secondary molding cavity being defined by a molding surface of the ejection element in the retracted position and by a wedge molding surface in the retracted position to form a leg of the part, the main molding cavity being in fluid communication with the secondary molding cavity.

According to another characteristic of the production tool according to the invention, the secondary molding cavity is arranged to form an orifice in the tab.

Other aspects and advantages of the invention will appear on reading the description which follows, given by way of example and made with reference to the appended drawings, in which:

FIGS. 1 to 5 are schematic sectional representations of a tool for producing part of a production tool during several successive stages in the use of the ejection device,

- Figures 6 to 8 are analogous representations of a part of a production tool according to a variant, during several successive stages of use of the ejection device.

In what follows, the terms “lower” and “upper” are defined with respect to the axis Y corresponding to the direction of the opening of the production tool and the term “lateral” means by relative to the X axis corresponding to a direction perpendicular to the direction of the Y axis, as shown in Figures 1 to 8.

A production tool 1 is shown in FIGS. 1 to 5. The production tool 1 is intended for producing a molded part 4. For example, the production tool 1 is an injection mold. The part 4 is produced, for example, by injection of a plastic material.

The part 4 is, for example, a vehicle part, in particular a motor vehicle, such as a dashboard body, a trim panel or another element of a vehicle, in particular a motor vehicle. The part 4 has a complex three-dimensional shape with at least one undercut zone 6, that is to say a part comprising at least one surface which cannot be removed from the mold by simply spacing two mold parts and requiring an additional molding element. and movable in a direction different from the direction of spacing of the two mold parts. The part 4 comprises a main surface 8 and a tab 10 extending from the main surface 8.

The tab 10 is of reduced size relative to the main surface 8 of the part 4. At least one undercut zone 6 is located on the tab 10.

In the example shown, the tab 10 is a tab intended to allow the locking of the part 4 formed on a structure of the vehicle. The tab 10 comprises a main portion 12 and a junction portion 14. The junction portion 14 extends from the main surface 8, in an extension direction E, for example, substantially perpendicular to the main surface 8. The main portion 12 extends in the extension of the junction portion 14 in the direction of extension E. The junction portion 14 has a thinner thickness than the main portion 12 to ensure a certain flexibility in the tab 10 so that 'it performs its snap-on function. The part of the junction 14 allows in particular the tab 10 to have an elastic behavior relative to the main surface 8. The junction portion 14 thus defines a first undercut area 6 of the part.

Furthermore, in the example represented in FIGS. 1 to 6, the tab 10 defines an orifice 16. The orifice 16 is adapted to cooperate with a locking pin of a latching device, to hold the part 4 in position on the vehicle structure. The orifice 16 defines a second undercut zone 6 of the part 10.

The production tool 1 comprises a first mold part 20, a second mold part (not shown) and an ejection device 22 for the part. The ejection device 22 includes an ejection element 26 and a shim 28.

The ejection element 26 is movable in translation relative to the first mold part 20 in an ejection direction A between a retracted position, represented in FIGS. 1 and 5, and an ejection position, represented in the Figures 3. The wedge 28 is movable in translation relative to the first mold part 20 movable in a direction of movement B between a retracted position, shown in Figures 1 and 5, and an ejection position, shown in the figures 2 to 4.

The direction of travel B is different from the direction of ejection A. For example, the direction of travel B forms an angle between 1 ° and 15 ° with the direction of ejection A.

The first mold part 20 and the second mold part each comprise a molding surface 30 disposed opposite the molding surface 30 of the other part.

The first part 20 and the second part are movable relative to each other in translation in a direction of movement between an open position and a closed position in the direction Y. For example, the direction of movement is parallel to the direction Ejection A.

In the open position, represented in FIGS. 1 to 6, the first part 20 and the second part are spaced from one another so as to leave an accessible space between the molding surfaces 30. This space makes it possible to load elements in the mold 1 or to remove the part 4 after its production using the ejection device 22.

In the closed position (not shown), the first part 20 and the second part are brought together so as to define, between the molding surfaces 30, a main cavity which has the shape of the main surface 8 of part 4 to be formed. The main cavity is, for example, in fluid communication with a source of injection materials.

The first part 20 of the mold has a thickness e according to the direction of movement. This thickness e is necessary to accommodate functional elements of the mold 1, such as an ejection system, cooling channels, a mold operating system (not shown). In addition, the first part 20 of the mold may comprise heating means and / or nozzles for injecting a plastic material into the main cavity in its thickness e.

The first part of the mold 20 defines a sheath 34 extending in the thickness e in a direction of movement. The sheath 34 is delimited by a contour 36 having a shape complementary to the external shape of the ejection device 22 when the ejection element 26 and the shim 28 are in the retracted position, as shown in FIG. 1 and in the FIG. 5. The sheath 34 opens into the main cavity through the molding surface 30 of the first part 20.

The ejection device 24 has at least one drive configuration in which the movement of the ejection element 26 in the direction of ejection A causes the displacement of the shim 28 in the direction of travel B and a clear configuration in which the wedge 28 is not driven by the displacement of the ejection element 26 in the direction of ejection A.

The ejection element 26 and the shim 28 each comprise a forming surface 38, 40 arranged facing the forming surface 38, 40 of the other in their retracted position. The ejection device 22 defines, when the ejection element 26 and the shim 28 are respectively in their retracted position, a secondary cavity 42, illustrated in FIG. 5, which has the shape of the tab 10 of the part 4 to be formed between the forming surfaces 38, 40. The main cavity and the secondary cavity 42 are in fluid communication.

The ejection element 26 has the shape of an arm extended in the direction of ejection A. The ejection element 26 comprises an upper portion 44 intended to be in contact with the part 4 formed and a lower portion 46 The ejection element 26 has an external lateral wall 48, intended to be in sliding contact with the contour 36 of the sleeve 34, and an opposite lateral wall 50, disposed opposite the wedge 28.

The upper portion 44 defines an upper contact wall 52 with the main surface 8 and, on the opposite side wall 50, the forming surface 38 of the ejection element 26 When the ejection element 26 is in the position retracted, the upper contact wall 52 extends in continuity with the molding surface 30 of the first mold part 20, and forms a part of the main mold cavity.

The forming surface 38 of the ejection element 26 is for example substantially planar as illustrated in FIGS. 1 to 5. The forming surface 38 extends in the direction of extension E of the tab 10. The outer side wall 48 extends substantially along a plane parallel or collinear to the direction of ejection A.

In addition, in the example shown in FIGS. 1 to 5, the direction of extension E of the tab 10 is collinear with the direction of ejection A.

The lower portion 46 is, for example, linked to a drive mechanism (not shown) capable of controlling the movement of the ejection element 26 between its retracted position and its ejection position. The drive mechanism includes, for example, a hydraulic cylinder.

In addition, the ejection element 26 defines a housing 56. In the example, the housing 56 opens into the opposite side wall 50. The housing 56 is limited along the axis Y by a lower shoulder 58, an upper shoulder 60 and laterally by a bottom wall 62.

For example, the bottom wall extends in the direction of ejection A.

The housing 56 has a shape complementary to a protuberance 64 defined on the wedge 28.

For example, the housing 56 and the protrusion 64 has a flared shape, such as a frustoconical shape. The flared shape of the housing 56 facilitates the introduction of the protrusion 64 into the housing 56. The lower shoulder 58 is capable of abutting against the protuberance 64 in the drive configuration so as to cause the displacement of the wedge 28 in the direction of travel B towards the ejection position when the ejection element 26 moves in the ejection direction A towards the ejection position.

The lower shoulder 58 pushes the shim 28 from the retracted position to the ejection position.

The surface of the lower shoulder 58 is parallel to the lower surface 8 of the part 4 to be molded in order to facilitate sliding in parallel and to avoid blocking of the part 4 or of the ejection element 22.

When the ejection device 22 is in the disengaged configuration, the protrusion 64 has come out of the housing 56, the shim 28 is no longer in contact with the upper shoulder 58. Thus the shim 28, outside of the housing 56, is not no longer driven in displacement by the ejection element 26 when it continues its race towards the ejection position.

The upper shoulder 60 is capable of abutting against the protuberance 64 in a drive configuration, so as to cause the displacement of the shim 28 in the direction of movement B towards the retracted position when the ejection element 26 moves in the direction of ejection A to the retracted position.

The upper shoulder 60 pushes the shim 28 from the ejection position to the retracted position.

The dimension of the lower shoulder 58 is less than the dimension of the upper shoulder 60 along the axis X.

This particular arrangement makes it possible to move the shim 28 in the direction of ejection by allowing the protuberance 64 to exit from the housing 58 and then to be able to continue moving the ejection element in the same direction without moving the shim 28 and power in the direction of retraction of the ejection element allow a return of the wedge 28 in the housing 56.

When the ejection element 26 is moved from its ejection position to the retracted position, the ejection element 26 slides along the surface of the wedge 28, without moving it, to the point where the upper shoulder 60 of greater dimension than lower shoulder 58 comes into contact with the protuberance 64 and pushes the wedge 28.

A lower shoulder 58 shorter than the upper shoulder 60 thus allows the use of the same ejection element 26 to control the movement of the wedge 28 in thrust or in retraction. The ejection device 22 is thus more compact.

The ejection device 22 further comprises a slide 66. The slide 66 extends in the sheath 34 of the first mold part 20 in the direction of movement B. The wedge 26 is mounted movable in translation in the direction of displacement B along the slide 66. The slide 66 is positioned on the contour 36 of the sleeve 34 of the first mold part 20.

The wedge 28 has the shape of an arm extended in the direction of movement B. The wedge 28 comprises an upper portion 68 intended to be in contact with the part 4 formed and a lower portion 70. The wedge 28 has an outer side wall 72, intended to be in sliding contact along the slide 66 and an opposite side wall 74, disposed opposite the ejection element 26. The outer side wall 72 extends substantially along a plane parallel or collinear with the travel direction B.

The upper portion 68 of the wedge 28 defines an upper wall of contact 76 with the main surface 8 and, on the opposite side wall 74, the forming surface 40 of the wedge 28. When the wedge 28 is in the retracted position, the upper contact wall 76 extends in continuity with the molding surface 30 of the first mold part 20, and forms a part of the main mold cavity.

The forming surface 40 of the wedge has for example a relief to form the reliefs of the tab 10. The wedge 26 comprises a molding part 80 of at least one undercut area 6 of the formed part 4.

In the example, the molding part 80 comprises a pin 82 making it possible to form the orifice 16 of the tab 10, and a rib 84 making it possible to form the junction portion 14 of the tab 10.

The direction of travel B is such that when the shim 28 moves from the retracted position to the ejection position the molding part 80 moves out of the undercut area 6.

The protrusion 64 is received in the housing 56 in the drive configuration and the protrusion 64 is outside the housing 56 in the disengaged configuration.

When the ejection element 26 and the shim 28 are in the retracted position, the pin 82 is in contact against the forming wall 38 of the ejection element 26.

When the ejection element and the shim are in the retracted position, the protuberance 82 is received entirely in the housing 56.

When the ejection device is in the connection configuration, the shim is at least partially received in the housing 56.

In addition, the dimension of the lower shoulder 58 in a direction parallel to the surface of the lower shoulder 28 is equal to the clearance distance necessary for the shim 28 to release the tab 10. Thus, the length of the shoulder lower 58 is greater than the depth of the orifice 16 of the tab 10 or the thickness of the pin 82 in the direction parallel to the surface of the lower shoulder 28. Thus, when the protuberance 64 of the wedge is released from the housing, the pin 82 has come out of the hole in the tab, which facilitates the release of the tab 10.

The operation of the production tool 1 will now be described.

When the production tool 1 is used to produce the part 4, the ejection device 22 is in the retracted position in the sheath 34, that is to say that the shim 28 is in the retracted position and the element ejection 26 is in the retracted position.

The production tool is closed 1, a main molding cavity and a secondary molding cavity 42 are defined by the mold parts and the ejection device 22.

A molding material is injected into the main cavity, and fills the main cavity and the secondary cavity 42, to form the part 4.

Following the production of the part 4, the production tool 1 is moved to its open position, as shown in FIG. 1, in order to allow the extraction of the finished part 4.

Once the production tool 1 is open or while the opening of the production tool 1 is in progress, the process of ejecting the part 4 formed begins.

During a first phase of ejection, the ejection device 22 is in a first drive configuration. The ejection element 26 is moved in the ejection direction A to its ejection position by a drive mechanism. During this movement, the lower shoulder 58 abuts against the protuberance 64 of the wedge 28 and pushes the wedge 28 from its retracted position to its ejection position. The wedge 28 moves in the direction of movement A guided by the gutter 66.

Thus, during the first phase, the ejection element 26 moves in the direction of ejection A and drives the shim 28 which moves in the direction of travel B. Control of the speed of movement of the element ejection 26 makes it possible to control the speed of movement of the wedge 28.

During this movement, the ejection element 26 drives the workpiece in the direction of ejection A towards the ejection position. The main surface 8 of the part is thus detached from the molding surface 30 of the first mold part 20. The main surface 8 of the part remains in abutment against the upper contact wall 52. Furthermore, in the example of FIGS. 1 to 5, the direction of ejection A being substantially the same as the direction of extension E of the tab 10, the tab 10 remains in abutment against the forming surface 38 of the ejection element 26.

During the first phase of ejection, each undercut zone 6 of the tab 10 is released thanks to the clearance of the wedge 28. In addition, the upper contact wall 76 of the wedge remains in contact with a part from the main surface 8, but slides along the main surface 8 in the direction X and departs from the tab 10. The direction of travel B and the position of ejection of the wedge are such that the lateral offset of the upper contact wall 76 of the shim 28 along the main surface 8 does not damage the part 4.

In addition, during this movement, the directions of ejection A and deflection B being different, the protuberance 64 gradually comes out of the housing 56. However, part of the wedge 28 remains in contact with the lower shoulder 58 until the shim 28 is in the ejection position.

When the wedge 28 arrives in the ejection position, as shown in FIG. 2, the protuberance 64 is completely extended from the housing 56. The lower surface of the protuberance 64 is no longer in contact with the lower shoulder 58. The ejection device 22 is then in the disengaged configuration. The ejection element 26 can continue its travel without causing the travel of the shim 28 in the direction of travel beyond its ejection position.

In a second phase of ejection, the ejection element 26 continues its race to its ejection position and to the final release of the part 4. During the displacement of the ejection element beyond from the position of ejection of the wedge 28, the wedge 28 is no longer moved. It is therefore not necessary to provide a large lateral clearance space for the wedge 28.

In addition, during sliding when the protrusion 64 of the wedge 28 is out of the housing, the lateral surface of the protrusion 64 is in sliding contact with the opposite side wall 50 of the lower portion 46 of the ejection element 26 .

When the tool 1 is to be used to form other parts 4 thereafter, provision is made to return the ejection device 22 to the retracted position so as to reform the initial secondary cavity 42.

As illustrated in FIGS. 3 to 5, during a repositioning phase, the ejection element 22 is moved in the direction of ejection A towards the retracted position. In a first phase, it is not in contact with the wedge 28 and therefore remains the only mobile, the ejection device 22 is always in the released configuration.

When the ejection element arrives at an intermediate position, illustrated in FIG. 4, the upper shoulder 60 of the ejection element 26 comes into contact with the protuberance 64 of the wedge 28. The ejection device 22 is then in drive configuration. The displacement of the ejection element 26 in the direction of ejection A towards the retracted position then causes the displacement of the shim 28 towards the retracted position in the direction of travel B.

As this movement progresses, the wedge 28 gradually enters the housing 56 so as to be completely received in the housing 56 when it arrives in the retracted position. When the shim 28 is fully received in the housing of the ejection element, it is completely locked in position. The mold is then ready to undergo a new process of making a part, ejecting and replacing it.

Thus, the production tool can be made more compact while retaining sufficient travel to allow the removal of the formed element.

In addition, the ejection element can be actuated by a simple hydraulic cylinder with a control device without the need for a wedge control synchronization unit.

In the example illustrated in FIGS. 1 to 5, the direction of ejection A is substantially equal to the direction of extension E of the tab 10.

In the variant illustrated in FIGS. 6 to 8, the direction of ejection A is substantially different from the direction of extension E of the tab 10 to facilitate the release of the tab 10 during the extraction. For example, the direction of ejection A forms an angle between 1 ° and 10 ° with the extension direction E. As illustrated in FIG. 8, at the end of the extraction, the tab 10 is moved away of the forming surface 38 of the ejection element 26.

The ejection device 22 can be installed in production tools having different shapes. The ejection device 22 is reliable, the ejection and travel strokes are mechanically controlled. In addition, the part 4 is completely cleared at the end of the ejection. The displacement distance of the shim 4 is less than the displacement distance of the ejection element 28.

The system is simple and does not require complex adjustments. It requires very little space. There are no disadvantages of wedge rod crossing due to the fact that the wedge 28 is controlled only by the ejection element 26. Such an arrangement prevents the risks of delay or acceleration of the wedge 26 relative to the ejection element 28. The stroke of the ejection element 26 is not limited by the stroke of the shim 26. The part 4 is released from the shim 26 before the end of the ejection assemblies, adjustments and maintenance are simple due to the simplicity of the device. The system is easily automated.

In the description, the production tool is an injection mold, however, the ejection device can be adapted to any type of mold.

Alternatively, the tab 10 has a different shape. For example, the tab 10 is an anti-shrinkage element, or a staple holder or the like.

Claims (10)

1. - Device for ejecting (22) a part (4) formed on a mold part (20), comprising: - an ejection element (26) movable in translation relative to the mold part (20) in an ejection direction (A) between a retracted position and an ejection position, a wedge (28) movable in translation relative to the mold part (20) in a direction of movement (B), different from the direction of ejection (A), between a retracted position and an ejection position, characterized in that the ejection device (22) has at least one drive configuration in which the displacement of the ejection element (26) in the direction of ejection (A) causes the displacement of the shim ( 28) in the direction of travel (B), and a clear configuration in which the shim (28) is not driven by the movement of the ejection element (26) in the ejection direction (A). 2, - Ejection device (22) according to claim 1, wherein the shim (28) comprises a protuberance (64) and the ejection element (26) defines a housing (56), the protuberance (64) being received in the housing (56) in the drive configuration, and the protuberance (64) being outside the housing (56) in the disengaged configuration. 3. - ejection device (22) according to claim 2, wherein the housing (56) is limited by at least one lower shoulder (58), the lower shoulder (58) being adapted to abut against the protuberance (64) in a drive configuration so as to cause the displacement of the shim (28) in the direction of movement (B) towards the ejection position when the ejection element (26) moves in the direction eject (A) to the eject position. 4, - Ejection device (22) according to claim 2 or 3, wherein the housing (56) is limited by at least one upper shoulder (60), the upper shoulder (60) being adapted to abut against the protrusion (64) in a drive configuration so as to cause the displacement of the shim (28) in the direction of travel (B) towards the retracted position when the ejection element (26) moves in the direction ejection (A) to the retracted position. 5. - Ejection device (22) according to any one of claims 1 to 4, wherein the direction of movement (B) forms an angle between 1 ° and 15 ° with the direction of ejection (A). 6. - Ejection device (22) according to any one of claims 1 to 5, comprising a slide (70) extending in the mold part (20) in the direction of movement (B), the shim ( 28) being mounted movable in translation in the direction of travel (B) along the slide (60). 7. - Ejection device (22) according to any one of claims 1 to 6, in which when the ejection element (26) and the shim (28) are in the retracted position, the first mold part ( 20), the ejection element (26) and the shim (28) define a forming cavity (38), of shape complementary to part of the part 4. 8. - Ejection device (22) according to any one of claims 1 to 7, wherein the shim (28) comprises a molding part of at least one undercut area (6) of the part (4) formed, the direction of movement (B) being such that when the shim (28) is moved from the retracted position to the ejection position, the molding part moves out of said undercut zone (6). 9. - production tool (1) of a part (4) comprising a first mold part (20), a second mold part and an ejection device (22) according to one of claims 1 to 8, a main molding cavity being defined by a molding surface (30) of the first mold part (20) and a molding surface of the second mold part to form a main surface (8) of the part (4), and a secondary molding cavity (42) being defined by a molding surface (38) of the ejection element (26) in the retracted position and by a molding surface (40) of the shim (28) in the retracted position to form a tab (10) of the part (4), the main mold cavity being in fluid communication with the secondary mold cavity (42). 10. - Tool for producing (1) a part according to claim 9, in which the secondary molding cavity (42) is arranged to form an orifice (16) in the tab (10). 2/3 QO θ CM ΓΟ