Injection molds for watch parts

Abstract

To provide an injection molding mold for watch components, a middle plate for the injection molding mold, and its manufacturing method.SOLUTION: An injection molding mold is provided in which a mold core contains a first part (1') and a second part movable mutually between a first injection position and a second releasing position, the first injection position is a position where two parts assemble to form an injection cavity that permits to inject a raw material so as to form an injection part (50') containing at least one component, the second releasing position is a position where the two parts are separated from each other so as to permit the release of an injection par (50'), at least one ejector contributes to release of the injection component, the injection molding contains at least one middle plate (10', 20') that is separate from the two parts of the mold core, is movable, and is arranged between the two parts of the mold core, at least one middle plate contains at least one first notch (12',22') forming at least a part of the injection cavity of the injection molding mold.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an injection mould and to a midplate for such an injection mould. The present invention relates to an injection mould, in particular for the production of watch parts, in particular suitable for microinjection. The present invention also relates to a method for producing watch parts and watches from such an injection mould. [Background technology]

[0002] The manufacture of watch components is particularly difficult, especially due to the fact that the components have very small dimensions and require very high mechanical properties.

[0003] One solution for the manufacture of watch parts consists of using microinjection, which involves injecting a material, for example a polymer, composite material, metal, or ceramic, into an injection mold in order to obtain the part after demolding. Due to the above-mentioned requirements, existing solutions leave room for further improvement. More specifically, existing solutions have drawbacks. In particular, microinjection molds are very expensive and do not allow for the easy implementation of numerous tests or dimensional changes for part adjustment or improvement. Furthermore, certain parts, including those with very small dimensions and very elongated shapes, are difficult to manufacture with microinjection, especially due to the complexity of ensuring their integrity during the ejection phase from the injection mold. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] European Patent Application Publication No. 3670440 [Patent Document 2] European Patent Application Publication No. 3670441 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the present invention aims to achieve all or part of the following objects.

[0006] A first object of the invention consists in proposing a solution for the manufacture of components by means of material injection, which is compatible with the manufacture of watch components.

[0007] A second object of the invention consists in proposing a solution for the manufacture of parts by injection molding that allows to obtain a high level of precision in a robust manner.

[0008] A third object of the present invention consists in proposing a solution for the production of parts that have reliable shape accuracy, while being flexible enough to allow iterations for adjustment and / or injection molding of various shape variants, without requiring significant additional costs or excessive time for modification of the injection molding tool. [Means for solving the problem]

[0009] Therefore, the present invention is based on an injection molding die comprising a die core and at least one ejector, the die core comprising a first part and a second part movable relative to one another between a first injection position and a second demolding position, the first injection position being a position where the two parts come together to form an injection cavity that allows the injection of material to form an injected part including at least one component, and the second demolding position being a position where the two parts move away from one another to allow the demolding of the injected part, the at least one ejector being designed to contribute to the demolding of the injected part, the injection molding die comprising at least one mid-plate that is separate from and movable and that is positioned between the two parts of the die core, the at least one mid-plate comprising at least one first notch that forms at least a part of the injection cavity of the injection molding die.

[0010] The invention is particularly defined by the claims.

[0011] These objects, features and advantages of the present invention will be explained in more detail in the following description of particular embodiments, made in a non-limiting manner with reference to the accompanying drawings. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic cross-sectional view of a subassembly of an injection mold according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of a cross section of a subassembly of an injection mold according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view of a blank obtained by injection into an injection mold according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view of the green body obtained from the injected part of FIG. [Figure 5] FIG. 5 is a schematic cross-sectional view of a subassembly of an injection mold according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a top view of a first intermediate plate of an injection molding die according to the first or second embodiment of the present invention. [Figure 7] FIG. 7 is a top view of a second intermediate plate 20' according to a second embodiment of the present invention. [Figure 8] FIG. 8 is a perspective view of a curling claw formed by the injection molding die according to the present invention. [Figure 9] FIG. 9 is a top view of a curling claw formed by an injection molding die according to the present invention. [Figure 10] FIG. 10 is a side view of a curling claw formed by an injection molding die according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] To facilitate understanding, the same reference numerals are used to denote identical features in the two embodiments, with the features of the second embodiment being prefixed with "'".

[0014] As explained in detail below, the concept of the present invention is based on the use of a modular injection mold that includes at least one movable mid-plate. This design allows the injection mold to be modified in a flexible manner by simply changing one or more mid-plates, without the need to manufacture the entire mold for each change. Thus, the present invention allows versatility of the injection mold in a reliable and robust manner.

[0015] More specifically, the present invention is based on an injection mold including a mold core containing a first part and a second part, which collectively form an injection cavity, with at least one intermediate plate disposed between and contributing to the two parts, and which is movable relative to one another between a first injection position that allows for the injection of material to form an injection blank or final part, and a second demolding position that allows for the removal of the injection part or final part. Such an injection blank includes at least one component, preferably multiple components connected by a sprue tree and / or support that allows for the simultaneous injection molding of multiple components, where the simultaneously injected components and their support are subsequently separated from the sprue tree by a cutting step. The injection cavity of the injection mold allows for the simultaneous production of one or more components, which potentially may be identical or different.

[0016] The two movable parts of the injection mold core can also assume a second demolding position in which they move away from each other to allow the ejection of the injected blank. To achieve this, the injection mold includes at least one ejector designed to contribute to the ejection of the injected blank (or part).

[0017] According to the present invention, the injection mold also includes at least one midplate that is separate from and movable with respect to the two parts of the mold core and that is positioned between the two parts of the mold core and includes at least one first notch that forms part of the injection cavity of the injection mold.

[0018] Figure 1 shows a first part 1 of an injection mould core according to a first embodiment, which cooperates with a mid-plate 10 shown in Figure 6. The mid-plate includes a cut-out 12. The sub-assembly formed by the first part 1 and the mid-plate 10 defines a cavity which allows the formation of an injected part 50 during the injection stage. It should be noted that during such stage, a second part of the injection mould core, not shown, cooperates with the sub-assembly 1, 10 to form a closed cavity.

[0019] The second part is moved towards or away from the first part in a translational direction D, called the injection or closing direction of the mold. The material is injected from the injection screw into the injection cavity in the same direction D. Advantageously, the two parts and the midplate of the injection mold core have substantially flat surfaces perpendicular to the injection direction. Furthermore, different ejectors 2, 3 are movable in this same injection direction D, as will be explained in more detail below.

[0020] The first part 1 also includes a notch 5 that is aligned with the notch 12 of the midplate 10 in the injection direction D. A first part ejector 2 is arranged in the notch 5 of the first part 1. In the injection configuration, the ejector 2 is positioned so that its end is located in an extension of the surface of the first part. This end forms part of the surface of the injection cavity. In other words, this end contributes to defining the shape of the part. In addition, a second ejector 3 is arranged in the injection mold, adjacent to the first ejector 2, in the area of ​​the notch 5 of the first part 1. During the injection phase, the second ejector 3 also forms the surface of the injection cavity. This surface is recessed relative to the end face of the first ejector 2. This surface allows for the definition of thickened portions of the injected part 50, as will be explained in detail below.

[0021] The notch 12 in the midplate 10 is a through-opening. The notch 12 is also positioned opposite the notch 5 in the first part so that the ejectors 2, 3 are positioned according to a shape that exactly corresponds to the notch 12 in the midplate. The notch 12 in the midplate contributes to the formation of the injection cavity of the injection mold, in particular a part of the injection cavity that precisely defines the part to be manufactured. More specifically, the side surfaces of the notch 12 in the midplate 10 define the contour of the injected part. The notch 12 also allows the displacement of at least one ejector 2, 3, primarily guided by the first part of the injection mold core, and allows the removal of the part after the injection phase.

[0022] This injection mold design allows the injection cavity to form an injected part 50 that includes supports 56 that connect separate parts together but do not form part of the part to be manufactured. The part is formed by a first portion 52 of the injected part 50 being superimposed on the first ejector 2 and a second portion 53 of the injected part 50 being superimposed on the second ejector 3.

[0023] Therefore, the injection cavity of the injection mold designed to form the injected part 50 is primarily configured to: - a first notch 12 in the intermediate plate 10; an end of the first ejector 2, which is located flush with one of the faces of the intermediate plate 10, and an end of the second ejector 3, which two ejectors are arranged and guided in a first part of the mold core of the mold, and a second part of the mould core (not shown) which defines the back surface, e.g. the plane, of the injection part 50; It is clear that the boundaries are

[0024] More specifically, the cross section of the notch 12 in the midplate 10 forms the surface of the cavity of the injection mold that defines the periphery of the watch part, the side 62 of the watch part, except for the tenon. It is worth noting that in the illustrated embodiment, the injection mold is used to manufacture the watch part, more specifically the winding pawl 60 shown in particular in Figures 8 to 10. The second aforementioned portion 53 forms the tenon 63 of the winding pawl 60, and the first portion 52 forms the side 62 of the winding pawl 60, in particular the beak 65.

[0025] Of course, the present invention is not limited to the specific shape of the injection cavity described above. More specifically, the shapes of the mid-plate 10 and the two moving parts of the injection mold may be appropriate for forming any other desired part. Similarly, the injection mold may include a different number and / or shape of part ejectors. Furthermore, the mid-plate 10 of the injection mold may include at least one blind notch and / or at least one surface texturing, apart from the notches described, to form at least one part of the injection cavity having a different shape.

[0026] FIG. 2 shows a perspective view of a subassembly of the injection mold in more detail, from which it can be seen that the injection mold has a generally cylindrical shape, forming around its periphery an annular portion 46 in which a number of cavities are arranged in the region of the pairs of ejectors 2, 3 mentioned above, said cavities being designed to form a number of parts, for example a number of identical take-up claws in this embodiment.

[0027] The injected part 50 shown in FIG. 3 is formed during the injection stage using such an injection mold. The injected material is continuously distributed over the annular portion 46 containing the various components to be manufactured, which are connected by annular-shaped supports 56. The injected material also resides in the deeper cavity of the central portion 44 of the injection mold, forming the rod or bar 54 of the injected part 50, commonly called a "sprue puller insert," which allows handling of the injected part 50, and forming the injection sprue 51 in the material injection channel (not shown). The injected material also resides in the intermediate section 45 between the central portion 44 and the annular portion 46, forming the injection seat 55 of the injected part 50. In the region of the connection between the peripheral annular portion 46 and the intermediate section 45, a cut line 47 is formed, which forms the pre-cut line 57 of the resulting injected part. The method thus performs a cutting step along the pre-cut line 57, allowing only the support 56 containing the components 52 and 53 shown in FIG. 4 to be retained.

[0028] To facilitate the removal of such an injected part 50 after its formation, the injection mold also includes a central ejector 4 designed to cooperate with the bar 54 of the injected part. The injection mold also includes supports 56 and ejectors 6 arranged between the various parts to be manufactured on the annular portion 46. Thus, the ejection system of the injection mold according to the first embodiment includes a number of complementary ejectors movably mounted inside the first part of the core of the injection mold, which perform a guiding function for these ejectors.

[0029] Thus, the midplate 10 includes complementary notches 16 which are through openings in the region of the ejectors 6 of the first part of the injection mould core to allow displacement of the ejectors through the midplate during the ejection phase, during which the ejectors come into direct contact with the injected part to remove it from the subassembly shown.

[0030] As mentioned above, the ejection system can be adapted to the part to be produced and can take various forms. However, regardless of the part to be produced, it is advantageous to have at least one support ejector. For this purpose, the intermediate plate advantageously includes at least one second notch 16, which is a through opening and is distinct from the first notch 12, the main function of the first notch being to define the injection cavity that specifically forms the part to be produced, while the second notch is provided solely for the passage of the ejector.

[0031] In this embodiment, the ejectors act separately on areas of the part to be manufactured, in particular on the tenon, on the area of ​​the surface of the part surrounding the tenon, and on the central area consisting of the support and / or injection sheet connecting the parts. This approach makes it possible to prevent deformation of the injected part during ejection from the mold and is particularly suitable for thin parts with a large surface area. This approach is also particularly suitable for ejecting fragile blanks, for example, formed by ceramic injection and containing ceramic particles and binder during injection.

[0032] Thus, the first part 1 of the injection mould core comprises a number of openings in which different ejectors are arranged in a translationally movable manner, the first part 1 of the injection mould core forming guides for these ejectors, and the intermediate plate 10 comprises through-openings in the region of these ejectors so that the ejectors can penetrate the intermediate plate to come into contact with the injected material during the ejection phase.

[0033] As mentioned above, the central portion of the injection part 50, which forms the injection sheet 55 shown in FIG. 3, is typically removed during mold opening by cutting along the pre-cut line 57 and ejecting using a central ejector. This results in an annular-shaped ring, as shown in FIG. 4, which includes multiple components fixed to a support 56. Once the ring has solidified, for example by cooling in the case of a metal or polymer ring, or by debinding and sintering in the case of a ceramic ring, the individual components are separated from the support 56 by flat precision grinding, which allows the surface 66 of each component to be defined. In the example described, the components are specifically pick-up jaws, as shown in FIGS. 8 to 10.

[0034] Advantageously, the midplate 10 is manufactured by the LIGA technique. This approach involves the formation of a mold by photolithography in a known manner, followed by the deposition of metal within the mold. The LIGA technique is advantageous because it allows the replication of several identical midplates using the same mask, while making it possible to obtain a high level of precision within the midplate. The side surfaces of the midplate are important, as they define the final shape of the injected part. To achieve this, it may be advantageous to use the teachings of US Pat. No. 5,649,999 and / or US Pat. No. 5,649,999 during the manufacture of the midplate 10.

[0035] Alternatively, the intermediate plate may also be manufactured by conventional machining of a metal plate or by wire machining or by stamping or by laser machining.

[0036] The pressures and temperatures of the injection process require a material with sufficient mechanical resistance (Rm) and dimensional stability at temperatures up to at least 100° C., or even up to 300° C. To this end, the intermediate plate may be made of nickel or nickel alloys, high-speed steel, ASP® steel produced by powder metallurgy, tungsten carbide, or any steel conventionally used in the manufacture of molds.

[0037] It should be mentioned that the use of a midplate has numerous advantages. In particular, it defines a significant portion of the injection cavity, in this case the shape of the beak 65 of the winding finger 60. This initial shape, although reworked through finishing steps such as polishing, is essential for the reliable future performance of the part. Therefore, when the midplate wears or if a slight modification is needed to improve the performance of the watch part, it is sufficient to change only the midplate and potentially the ejectors. The modular construction of this injection mold allows flexibility in the shape of the midplate, whose cutouts can be slightly modified while still allowing the passage of one or more ejectors.

[0038] It is important to emphasize that the described injection molds allow microinjection. Injection molds allow the use of a variety of materials, including polymers, composites, metals, or more specifically ceramics. For this reason, injection molds allow the production of watch components, especially those made of ceramics.

[0039] The invention is not limited to the embodiments described above, and in particular more complex shapes can be formed by using multiple, in particular two, three or more, intermediate plates.

[0040] 5 to 7 show a second embodiment of an injection mold including two midplates, which will be described in the context of the blank and the production of a part identical to the part described in the example of the injection mold according to the first embodiment.

[0041] FIG. 5 shows a first part 1' of an injection-molding core according to a second embodiment, cooperating with a first mid-plate 10' and a second mid-plate 20'. These two mid-plates 10', 20', respectively, shown in FIGS. 6 and 7, include notches 12', 22' (through openings), which at least partially overlap. The subassembly formed by the first part 1' of the injection-molding core and the two mid-plates 10', 20' is based on the overlapping of the three elements in the injection direction, with the second mid-plate 20' positioned between the first part 1' of the injection-molding core and the first mid-plate 10'. This subassembly defines a cavity that allows the formation of an injected part 50' during the injection phase. Note that during this phase, a second part of the injection-molding core (not shown) cooperates with this subassembly to form a closed cavity.

[0042] The second part of the injection mold core is moved towards or away from the first part in a translational direction D', called the injection or closing direction of the mold, as described above. The material is injected into the injection cavity in the same direction D'. Advantageously, the two parts of the injection mold core and the intermediate plate have a substantially planar surface perpendicular to the injection direction. Furthermore, different ejectors are movable in this same injection direction D'.

[0043] The first part 1' of the injection mold core also includes a notch 5' that is at least partially aligned with the notches 12', 22' of the midplates 10', 20' in the mold injection and closing direction D'. A part ejector 3' is arranged in the notch 5' of the first part 1'. In the injection configuration, the ejector 3' is positioned so that its end surface defines the height of the tenon 53'. This end surface thus forms part of the surface of the injection cavity. In other words, this end surface contributes to defining the shape of the part. This surface is recessed relative to the surfaces of the two midplates 10', 20' that define the injection cavity. This surface allows for the definition of thickened portions of the injected part 50', as will be explained in detail below.

[0044] As shown in FIG. 6, the notch 12' in the first intermediate plate 10' is a through-opening. This also applies to the notch 22' in the second intermediate plate 20'. These two notches 12', 22' are located opposite the notch 5' in the first part 1' so that the ejector 3' is positioned according to a shape that substantially corresponds to the shape of the notch 22' in the second intermediate plate 20'. The notch 22' in the second intermediate plate 20' contributes to the formation of part of the injection cavity of the injection mold, more particularly of the injection cavity that defines the tenon 53' of the injected part 50' to be produced. The notch 22' also allows the displacement of at least one ejector 3', primarily guided by the first part 1' of the injection mold core, and designed to act on said tenon 53', allowing the ejection of the part after the injection phase. The notch 12' in the first intermediate plate 10' also contributes to the formation of the injection cavity of the injection mold, more specifically the part of the injection cavity that defines the component 52' of the injected part 50' other than the tenon 53'.

[0045] This injection mold design allows the injection cavity to produce an injected part 50' similar to the injected part obtained with the injection mold according to the first embodiment, including supports 56' that connect the separate components together but do not form part of the part to be produced. The part is formed by a first portion 52' of the injected part 50' and a second portion 53' of the injected part 50' that is superimposed on the ejector 3'.

[0046] It should be mentioned that in the illustrated example, the injection mold according to the second embodiment is used, as in the example shown in the first embodiment, for the manufacture of a timepiece part, more specifically the winding pawl 60 shown in particular in Figures 8 to 10.

[0047] Therefore, the injection cavity of the injection mold designed to form the injection molded injection part 50' is primarily configured to: - a first notch 12' in at least one first intermediate plate 10'; - at least one first notch 22' in the second intermediate plate 20'; - an end of the ejector 3', located within the thickness of one of the intermediate plates or beyond one or more intermediate plates, said ejector 3' being arranged and guided in the first part 1' of the mould core, and a second part of the mold core (not shown), which defines the rear surface of the injection part 50', for example a plane, It is clear that the boundaries are

[0048] More specifically, the sides of the notch 12' in the first midplate 10' form the surfaces of the cavity of the injection mold that define the periphery of the watch part, side surface 62, except for the tenon 63. The sides of the notch 22' in the second midplate 20' form the surfaces of the cavity of the injection mold that define the periphery of the tenon of the watch part. The top surface of the second midplate 20' also defines the surface 67 of the watch part, and the second part of the mold core defines the back surface of the injected part 50'.

[0049] This second embodiment offers additional flexibility over the first embodiment, since the separate portions of the same part are ultimately defined by separate and movable mid-plates of the injection mold. This allows the second embodiment to modify only one of the two parts by modifying a single mid-plate, without changing the other part or the other mid-plate. On the other hand, only the end of the tenon is defined by a part (ejector 3') that is different from the two mid-plates. This allows the shape of the part, in particular the beak of the claw, to be modified in a more versatile manner, and / or the height of the tenon, in particular, without modifying the first part 1' of the injection mold core, by intervening only in the position of the mid-plate and / or ejector 3'.

[0050] Finally, the second embodiment can be extended to any injection mold including at least two at least partially overlapping mid-plates, each including at least one first notch that defines a surface of an injection cavity, where the respective first notches overlap to define complementary shapes of the injection cavities, and the first notches and / or further notches in the mid-plates are designed to allow passage of the same ejector of injected parts through the at least two mid-plates.

[0051] 6 and 7 show two mid-plates 10' and 20'. As in the first embodiment, the injection mold forms a blank, which is given a substantially cylindrical shape and allows obtaining an annular-shaped blank containing several parts. The mid-plates thus have a circular disk shape and include notches for forming part of the injection cavity and / or for the passage of different ejectors. Thus, apart from the first notches 12' and 22' described above, these mid-plates 10' and 20' each include additional, overlapping notches 16' and 26', respectively, which allow the passage of a complementary ejector of an injection part 50' (not shown), in a manner similar to that of the first embodiment, and as explained in particular with reference to FIG. 2.

[0052] It should be mentioned that the mid-plates 10' and 20' may be manufactured by the same methods as those described within the context of the first embodiment.

[0053] Of course, the invention is not limited to the above-described embodiments, and the plates can have shapes different from those described. The mid-plates may, for example, have blind cutouts and / or raised reliefs and / or texturing in the area of ​​the injection cavity of the injection mold. Furthermore, the mid-plates are movably mounted in the injection mold, allowing them to be modified independently of each other as required.

[0054] The present invention also relates to a midplate itself. Such a midplate includes at least one first notch, which is designed to be movably positioned between two movable parts of an injection mold so as to form part of the injection cavity of the injection mold. The at least one first notch is a through-hole. The midplate may also include at least one blind notch and / or at least one texturing on the surface of the plate that forms the injection cavity. The midplate may also include at least one second notch to allow passage of an ejector of the injection mold. The midplate may be made of a material with mechanical resistance designed to support the pressure of the injection mold and dimensional stability at temperatures of at least 100°C, or even up to 300°C, and may be made of metal, particularly steel, or tungsten carbide.

[0055] The invention also relates to a method for manufacturing the midplate of an injection mould as defined above, comprising a manufacturing step of said midplate by galvanic deposition, in particular the LIGA method, or by machining, in particular wire or laser machining, of a metal plate, or by stamping.

[0056] The present invention also relates to a method for manufacturing a timepiece component and a timepiece, in particular a wristwatch, comprising the step of injecting a material into the injection cavity of an injection mould as described above. Advantageously, such material is a ceramic-based material, i.e. a material containing at least 50% by weight of ceramic. The manufacture of the timepiece may also include the integration of one or more timepiece components, which have been produced in whole or in part by injecting material into an injection mould according to the invention as described above.

[0057] The method for manufacturing a watch part may comprise a step consisting of selecting at least one midplate for an injection mould from various midplates adapted to said injection mould in order to determine the shape of the part.

[0058] The method for manufacturing a watch part may also comprise separate steps, prior to said manufacturing step of the midplate, by galvanic deposition, in particular the LIGA method, or by machining of a metal plate, in particular by wire or laser machining, or by stamping.

[0059] The invention has been implemented within the context of the manufacture of watch parts. The invention is also applicable to the manufacture of any part with small dimensions, i.e. in general in the field of microinjection. In a more general aspect, the solution can be implemented with any injection mould, regardless of its dimensions. [Explanation of symbols]

[0060] 1. First Part 2 Ejector 3 Ejector 4 Central Ejector 6 Ejector 10 Middle Plate 10' 1st middle board 12 First notch 16 Second notch 20' 2nd middle board 22' notch 26' notch 50 injection parts 60 Curling Claw

Claims

1. 1. An injection mold comprising a mold core and at least one ejector (2, 3; 3'), wherein the mold core comprises two parts, a first part (1; 1') and a second part, movable relative to each other between a first injection position and a second demolding position, wherein the first injection position is a position where the two parts come together to form an injection cavity allowing the injection of material to form an injected part (50; 50') comprising at least one component (60), and wherein the second demolding position is a position where the two parts move away from each other to allow the demolding of the injected part (50; 50'), and wherein the at least one ejector (2, 3; 3') is designed to contribute to the demolding of the injected part (50; 50'), the injection mold comprises at least one intermediate plate (10; 10', 20') separate from and movable with respect to the two parts of the mold core and arranged between the two parts of the mold core, the at least one intermediate plate (10; 10', 20') comprising at least one first notch (12; 12', 22') forming at least a part of the injection cavity of the injection mold; said at least one intermediate plate (10; 10', 20') also comprises at least one blind cutout and / or at least one texturing of the surface of said intermediate plate forming at least part of said injection cavity; Injection mold.

2. The injection mold includes at least two at least partially overlapping mid-plates (10', 20'), each of the mid-plates including at least one first notch (12; 22') that delimits at least a portion of the injection cavity, and each of the first notches (12; 22') overlaps. The injection mold according to claim 1 .

3. The intermediate plates (10'; 20') each include at least one second notch (16', 26') which is a through opening, and each of the at least one second notch (16', 26') at least partially overlaps to allow passage of the same ejector; 3. The injection mold according to claim 2.

4. An injection mould comprising a mould core and at least one ejector (2, 3; 3'), wherein the mould core comprises two parts, a first part (1; 1') and a second part, movable relative to each other between a first injection position and a second demolding position, wherein the first injection position is a position where the two parts come together to form an injection cavity which allows injection of material to form an injected part (50; 50') comprising at least one component (60), and wherein the second demolding position is a position where the two parts move away from each other to allow demolding of the injected part (50; 50'), and wherein the at least one ejector (2, 3; 3') is designed to contribute to the demolding of the injected part (50; 50'), the injection mold comprises at least one intermediate plate (10; 10', 20') separate from and movable with respect to the two parts of the mold core and arranged between the two parts of the mold core, the at least one intermediate plate (10; 10', 20') comprising at least one first notch (12; 12', 22') forming at least a part of the injection cavity of the injection mold; The injection mold comprises at least two at least partially overlapping mid-plates (10', 20'), each of the mid-plates comprising at least one first notch (12; 22') that respectively delimits at least a portion of the injection cavity, each of the first notches (12; 22') overlapping; the intermediate plates (10'; 20') each include at least one second notch (16', 26') which is a through opening, and each of the at least one second notch (16', 26') at least partially overlaps to allow passage of the same ejector; Injection mold.

5. The at least one intermediate plate (10; 10', 20') includes a plurality of first notches (12; 12', 22') designed to simultaneously define the shapes of a plurality of injected parts, and the injection cavity includes a cross-section located in a plane parallel to the plane of the at least one intermediate plate (10; 10', 20') configured so that the plurality of injected parts remain connected by an injection molding support (56; 56') after removal from the injection mold.

5. An injection mold according to any one of claims 1 to 4.

6. The method includes at least one movable ejector (16, 16') that acts within the injection molding support, thereby enabling the ejection of the injected part.

6. The injection mold according to claim 5.

7. An injection mould comprising a mould core and at least one ejector (2, 3; 3'), wherein the mould core comprises two parts, a first part (1; 1') and a second part, movable relative to each other between a first injection position and a second demolding position, wherein the first injection position is a position where the two parts come together to form an injection cavity which allows injection of material to form an injected part (50; 50') comprising at least one component (60), and wherein the second demolding position is a position where the two parts move away from each other to allow demolding of the injected part (50; 50'), and wherein the at least one ejector (2, 3; 3') is designed to contribute to the demolding of the injected part (50; 50'), the injection mold comprises at least one intermediate plate (10; 10', 20') separate from and movable with respect to the two parts of the mold core and arranged between the two parts of the mold core, the at least one intermediate plate (10; 10', 20') comprising at least one first notch (12; 12', 22') forming at least a part of the injection cavity of the injection mold; the at least one intermediate plate (10; 10', 20') comprises a plurality of first notches (12; 12', 22') designed to simultaneously define the shapes of a plurality of injected parts, the injection cavity comprising a cross section located in a plane parallel to the plane of the at least one intermediate plate (10; 10', 20') and configured such that the plurality of injected parts are kept connected by an injection molding support (56; 56') after removal from the injection mold, at least one movable ejector (16, 16') that acts on the area of ​​the injection molding support, thereby making it possible to eject the injected part; Injection mold.

8. The two parts of the mold core are movable relative to each other in translation in the direction of the injection mold, and the at least one intermediate plate (10; 10', 20') exists as a substantially planar plate, located in a plane perpendicular to the direction of the injection mold.

8. An injection mold according to any one of claims 1 to 7.

9. The at least one first notch (12; 12', 22') of the at least one intermediate plate (10: 10', 20') is a through opening; 9. An injection mold according to any one of claims 1 to 8.

10. The at least one ejector (2, 3; 3') passes through the at least one first notch (12; 12', 22') of the at least one intermediate plate (10; 10', 20'), thereby enabling ejection of the injected part (50, 50').

10. An injection mold according to any one of claims 1 to 9.

11. said at least one intermediate plate (10; 10', 20') is a through opening and comprises at least one second notch (16; 16') distinct from said first notch (12; 12', 22') and designed for the passage of an ejector (4, 6; 4', 6'); An injection mold according to any one of claims 1 to 10.

12. The injection cavity designed to form an injected part (50; 50') containing at least one component, the first part (1;1') of the mould core and / or at least one ejector (4, 4') of the first part (1;1'), said at least one first notch (12; 12', 22') in said at least one midplate (10; 10', 20'); at least one end of at least one second ejector (3, 3'); the second part of the mold core; Delimited primarily by 12. An injection mould according to any one of claims 1 to 11.

13. The first part (1; 1') of the mould core and / or the second part of the mould core against which the at least one intermediate plate (10; 10', 20') abuts is planar.

13. An injection mould according to any one of claims 1 to 12.

14. A mid-plate (10; 10', 20') for an injection mould, comprising at least one first notch (12; 12', 22'), said at least one first notch (12; 12', 22') designed for movable placement between two movable parts of an injection mould so as to form part of an injection cavity of said injection mould, said at least one first notch (12; 12', 22') being a through opening; further comprising at least one blind cutout and / or at least one texturing on the surface of the injection mold intermediate plate (10; 10', 20') forming the injection cavity, Center plate for injection molding molds.

15. At least one second notch (16, 47; 16', 47', 26') that allows passage of an ejector (4, 6; 4', 6') of an injection molding mold, A mid-plate (10; 10', 20') according to claim 14.

16. Made of metal or tungsten carbide, which has mechanical resistance designed to support the pressure of an injection molding die and is a material that has shape stability at temperatures of at least 100°C or up to 300°C. A midplate (10; 10', 20') according to claim 14 or 15.

17. The method of claim 17, comprising the step of manufacturing the injection mold midplate by galvanic deposition, by machining a metal plate, or by stamping. A method for manufacturing the injection mold midplate according to any one of claims 14 to 16.

18. A method for manufacturing a middle plate (10; 10', 20') for an injection molding die, comprising: the injection mold midplate comprises at least one first notch (12; 12', 22') and is designed for movable placement between two movable parts of the injection mold, such that the at least one first notch (12; 12', 22') forms part of an injection cavity of the injection mold; A method for manufacturing a midplate for an injection mould, comprising the steps of manufacturing said midplate for an injection mould by galvanic deposition or by machining a metal sheet or by stamping.

19. injecting a material into the injection cavity of the injection mould according to any one of claims 1 to 13; Manufacturing methods for watch parts or watches.

20. A method for manufacturing a watch component or a watch, comprising the step of injecting a material into the injection cavity of an injection mould, The injection mold comprises:

1. An injection mold comprising a mold core and at least one ejector (2, 3; 3'), wherein the mold core comprises two parts, a first part (1; 1') and a second part, movable relative to each other between a first injection position and a second demolding position, wherein the first injection position is a position where the two parts come together to form an injection cavity allowing the injection of material to form an injected part (50; 50') comprising at least one component (60), and wherein the second demolding position is a position where the two parts move away from each other to allow the demolding of the injected part (50; 50'), and wherein the at least one ejector (2, 3; 3') is designed to contribute to the demolding of the injected part (50; 50'), the injection mold comprises at least one mid-plate (10; 10', 20') separate from and movable with respect to the two parts of the mold core and arranged between the two parts of the mold core, the at least one mid-plate (10; 10', 20') comprising at least one first notch (12; 12', 22') forming at least a part of the injection cavity of the injection mold; Manufacturing methods for watch parts or watches.

21. The material is a ceramic material. A method for manufacturing a watch component or a watch according to claim 19 or 20.

22. The watch part is a claw. A method for manufacturing a watch component or a watch according to any one of claims 19 to 21.

23. The method includes the steps of selecting at least one mid-plate adapted to the injection mold and inserting the mid-plate into the injection mold before the step of injecting the material. A method for manufacturing a watch component or a watch according to any one of claims 19 to 22.

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