Injection mold for coating a component and method for coating a component using such a mold

Abstract

Injection mold (1) for coating a hollow component (2) for a device for current measurement or suppression, comprising a first mold part (3) and a second mold part (4), wherein the first mold part (3) and the second mold part (4) each have a first mold half (3a, 4a) and a second mold half (3b, 4b), wherein the first mold half (3a, 4a) and the second mold half (3b, 4b) each form a cavity (5a, 5b) for receiving the component (2) to be coated when the mold part (3, 4) is closed, wherein the component (2) can be arranged in a first cavity (5a) of the first mold part (3) such that a first partial cavity (6a) is formed between the closed first mold part (3) and the component (2) at least around the outside of the component (2), and wherein the component (2) can be arranged in such a way in a second cavity (5b) of the second shaping part (4),that a second partial cavity (6b) is formed at least internally around the component (2) between the closed second forming part (4) and the component (2), as well as a method in which the injection mold (1) is used.

Description

Field of the invention

[0001] The present invention relates to an injection mold for coating, in particular, a substantially hollow component for a device for current measurement or suppression, comprising a first molding part and a second molding part, wherein the first molding part and the second molding part each have a first mold half and a second mold half, wherein the first mold half and the second mold half, when the molding part is closed, each form a cavity for receiving the component to be coated, wherein the component can be arranged in a first cavity of the first molding part in such a way that a first partial cavity is formed between the closed first molding part and the component, at least externally surrounding the component, and wherein the component can be arranged in a second cavity of the second molding part in such a way,that a second partial cavity is formed between the closed second molding part and the component, at least on the inside, surrounding the component, and a method for coating a component for a device for current measurement or suppression using such an injection mold. State of the art

[0002] In the automotive industry, a variety of metallic components are manufactured and used, such as cores or chokes with ferromagnetic properties, which are used when a current flowing in a circuit is to be measured or the current flow (e.g. parasitic currents) is to be suppressed, such as in the circuit of an electrical cable installed in a vehicle.

[0003] The manufacturing tolerances on such components are often very high and must usually be kept as small as possible. Maintaining sufficiently tight tolerances can be very costly. Therefore, these components are often coated to ensure electrical insulation from the wires and to maintain tolerances. Summary of the invention

[0004] It is an object of the invention to provide an injection molding tool for coating, in particular, a component for current measurement or suppression of the current flow, so that a complete coating of the component is possible in a simple manner despite high component tolerances.

[0005] Furthermore, it is an object of the invention to provide an improved method for coating a component for current measurement or suppression of current flow.

[0006] This need can be met by the subject matter of the present invention according to independent claims 1 and 11. Advantageous embodiments of the present invention are described in the dependent claims.

[0007] The injection molding tool according to the invention is used for coating in particular a hollow component for a current measuring device or for suppressing the current flow.

[0008] The term “hollow component” refers to components that have a central cavity and any shape in cross-section around the outside, such as a hollow cylindrical component, i.e. a component that has a central cavity and a round cross-section around the outside.

[0009] A hollow component for current measurement or current suppression is understood to mean, in particular, a core or a choke.

[0010] The injection molding tool according to the invention comprises a first molding part and a second molding part.

[0011] According to the invention, the first molding part and the second molding part each comprise a first mold half and a second mold half, wherein the first mold half and the second mold half each form a cavity for receiving the component to be coated when the molding part is closed. The first mold half and the second mold half of the first molding part form a first cavity when the first molding part is closed. The first mold half and the second mold half of the second molding part form a second cavity when the second molding part is closed.

[0012] According to the invention, the component can be arranged in the first cavity of the first shaping part in such a way that a first partial cavity is formed between the first shaping part and the component, at least on the outside surrounding the component, and wherein the component can be arranged in a second cavity of the second shaping part in such a way that a second partial cavity is formed between the second shaping part and the component, at least on the inside surrounding the component.

[0013] The term "outside" refers to an outer surface, i.e., an outer cylindrical wall, of the hollow component. The term "inside" refers to an inner surface, i.e., an inner cylindrical wall, of the hollow component.

[0014] Preferably, the first mold half and the second mold half of the first molding part are each substantially pot-shaped with a circumferential wall part and a base part closing off the wall part on one side, wherein when the first molding part is closed, the first mold half and the second mold half are sealingly connected in the region of the end faces of the wall parts.

[0015] Furthermore, the first mold half and the second mold half of the second shaping part are preferably designed substantially pot-shaped with a circumferential wall part and a base part closing off the wall part on one side, wherein a central cylindrical leg extends from the base part in each case, wherein when the second shaping part is closed, the first mold half and the second mold half are sealingly connected in the region of the end faces of the wall parts and the central cylindrical legs.

[0016] In a particularly advantageous embodiment of the present invention, the first shaping part has a spring-loaded first punch, wherein the spring-loaded first punch is arranged in a first opening of the first mold half of the first shaping part when the first shaping part is closed in such a way that it clamps the component vertically against the second mold half, thereby compensating for a manufacturing-related tolerance of the component.

[0017] Furthermore, the first molding part particularly preferably has a support element, wherein the support element, when the first molding part is closed, can be introduced into a central cavity of the component via a second opening in the second mold half of the first molding part and supports the component horizontally, thereby compensating for a manufacturing-related tolerance of the component. The support element also guarantees that the component does not rest against the inner wall of the wall part of the first mold half of the first molding part and against the inner wall of the wall part of the second mold half of the first molding part, which would prevent material flow between the respective wall part and the component and would result in an outer surface of the component not being coated.

[0018] The first opening for receiving the spring-loaded first punch is preferably formed centrally on the bottom part of the first mold half of the first molding part and the second opening for introducing the support element is preferably formed centrally on the bottom part of the second mold half of the first molding part.

[0019] The bottom part of the first mold half of the first molding part or the first punch preferably has at least one circumferential first sealing surface and the bottom part of the second mold half of the first molding part preferably has at least one circumferential second sealing surface by means of which the first partial cavity is sealed when the first molding part is closed.

[0020] Preferably, at least one channel is formed in each of the first mold half and / or the second mold half of the first molding part and in the first mold half and / or the second mold half of the second molding part, via which channel the respective partial cavity can be connected to an injection device when the respective molding part is closed.

[0021] The first mold half of the first molding part and the first mold half of the second molding part can be formed in one piece.

[0022] Furthermore, the second mold half of the first molding part and the second mold half of the second molding part can be formed in one piece.

[0023] The method according to the invention for coating a component for a device for current measurement or suppression takes place using the injection mold according to the invention and comprises at least the following steps: - arranging the component in the first cavity of the first shaping part, so that a first partial cavity is formed between the first shaping part and the component at least around the outside of the component, - Adding a coating compound into the first partial cavity, - transferring the externally coated component from the first forming part into the second forming part, wherein the component is arranged in the second cavity of the second forming part such that the second partial cavity is formed between the second forming part and the component at least circumferentially around the inside of the component, - Adding a coating compound into the second partial cavity. Brief description of the drawings

[0024] The invention is described below by way of example with reference to the drawings. Fig. 1 shows schematically a plan view of a first forming part. Fig. 2 shows schematically a sectional view of a first shaping part according to Fig. 1 along the section plane AA. Fig. 3 shows schematically a sectional view of a first shaping part according to Fig. 2 along the section plane CC. Fig. 4 shows schematically a plan view of a second forming part. Fig. 5 shows schematically a sectional view of a second forming part according to Fig. 4 along the section plane BB. Detailed description of the invention

[0025] In Fig. 1 to Fig. 3 shows an example of a first molding part 3 of an injection molding tool 1 according to the present invention. Fig. 4 and Fig. 5 show an exemplary second molding part 4 of the injection mold 1 according to the present invention.

[0026] The injection molding tool 1 is used to coat a substantially hollow-cylindrical component 2, namely a core or a choke, for a device for current measurement or suppression.

[0027] The injection mold 1 comprises the first molding part 3 and the second molding part 4.

[0028] The Fig. 1 to Fig. The first molding part 3 shown in Fig. 3 comprises a first mold half 3a and a second mold half 3b.

[0029] The first mold half 3a and the second mold half 3b form, with the first molding part 3 closed, a first cavity 5a for receiving the component 2 to be coated ( Fig. 2, Fig. 3).

[0030] The component 2 can be arranged in the first cavity 5a of the first shaping part 3 in such a way that a first partial cavity 6a is formed between the first shaping part 3 and the component 2, at least externally surrounding the component 2 ( Fig. 2, Fig. 3).

[0031] The term “outside” refers to an outer surface 19, i.e. an outer cylinder wall, of the hollow cylindrical component 2.

[0032] The first mold half 3a and the second mold half 3b of the first molding part are each essentially pot-shaped with a circumferential wall part 7', 7" and a bottom part 8', 8" closing off the wall part 7', 7" on one side. When the first molding part 3 is closed, the first mold half 3a and the second mold half 3b of the first molding part 3 are sealingly connected in the region of the end faces of the wall parts 7', 7" ( Fig. 2).

[0033] The first forming part 3 has a spring-loaded first punch 12, wherein the spring-loaded first punch 12 is arranged in a first opening 13 of the first mold half 3a of the first forming part 3 when the first forming part 3 is closed, such that it clamps the component 2 vertically against the second mold half 3b, thereby compensating for a manufacturing-related tolerance of the component 2 ( Fig. 1, Fig. 2).

[0034] Furthermore, the first forming part 3 has a support element 14, wherein the support element 14 can be introduced into a central cavity 16 of the component 2 via a second opening 15 in the second mold half 3b of the first forming part 3 when the first forming part 3 is closed and supports the component 2 horizontally, thereby compensating for a manufacturing-related tolerance of the component 2 ( Fig. 2, Fig. 3).

[0035] The support element 14 also guarantees that the component 2 does not rest on the inner wall of the wall part 7' of the first mold half 3a of the first molding part 3 and on the inner wall of the wall part 7'' of the second mold half 3b of the first molding part 3, whereby a material flow between the respective wall part 7', 7'' and the component 2 would be prevented and an outer surface of the component 2 would not be coated.

[0036] The first opening 13 for receiving the spring-loaded first punch 12 is formed centrally on the bottom part 8' of the first mold half 3a of the first molding part 3. The second opening 15 for introducing the support element 14 is formed centrally on the bottom part 8'' of the second mold half 3b of the first molding part 3 ( Fig. 2).

[0037] The spring-loaded first punch 12 has a circumferential first sealing surface 17. The base part 8'' of the second mold half 3b of the first molding part 3 has a circumferential second sealing surface 18. By means of the first sealing surface 17 and the second sealing surface 18, the first partial cavity 6a is sealed when the first molding part 3 is closed. The sealing surfaces 17, 18 lie against the respective end faces of the hollow cylindrical component 2. The term "circumferential" in this context is to be understood such that the sealing surfaces 17, 18 on the end faces of the hollow cylindrical component 2 extend sealingly around the central cavity 16 of the hollow cylindrical component 2, i.e., they surround it at least once ( Fig. 2).

[0038] The surface pressure between the first sealing surface 17 and the component 2 as well as the second sealing surface 18 and the component must be large enough to guarantee tightness and prevent leakage of the filling material.

[0039] At the same time, however, the surface pressure must not be so great that component 2 is damaged. Here, a suitable balance must be found, depending on the properties of component 2.

[0040] The Fig. 4 to Fig. The second molding part 4 shown in Figure 5 comprises a first mold half 4a and a second mold half 4b.

[0041] The first mold half 4a and the second mold half 4b of the second molding part 4 form, when the second molding part 4 is closed, a second cavity 5b for receiving the component 2 to be coated ( Fig. 5).

[0042] The component 2 can be arranged in a second cavity 5b of the second shaping part 4 in such a way that a second partial cavity 6b is formed between the second shaping part 4 and the component 2, at least on the inside surrounding the component 2 ( Fig. 5).

[0043] The term “inside” refers to an inner surface 20, i.e. an inner cylinder wall, of the hollow cylindrical component 2.

[0044] The first mold half 4a and the second mold half 4b of the second molding part 4 are essentially pot-shaped with a circumferential wall part 9', 9'' and a base part 10', 10'' closing the wall part 9', 9'' on one side, wherein a central, essentially cylindrical leg 11', 11'' extends from the base part 10', 10'', wherein when the second molding part 4 is closed, the first mold half 4a and the second mold half 4b are sealingly connected in the region of the end faces of the wall parts 9', 9'' and the central cylindrical legs 11', 11'' ( Fig. 4, Fig. 5).

[0045] The second cavity 5b of the second forming part 4 is delimited by the circumferential wall parts 9', 9'', the central legs 11', 11' and the base parts 10', 10'' of the second forming part 4 ( Fig. 5).

[0046] The second forming part 4 further comprises a spring-loaded second punch 21, wherein the spring-loaded second punch 21 is arranged in the cavity 5b in the region of the first mold half 4a of the second forming part 4 when the second forming part 4 is closed, such that it clamps the component 2 vertically against the second mold half 4b, whereby a production-related tolerance of the component 2 due to the coating process from or in the first forming part 3 is compensated ( Fig. 5).

[0047] In the first mold half 3a and / or the second mold half 3b of the first molding part 3 and in the first mold half 4a and / or the second mold half 4b of the second molding part 4, at least one channel is formed, via which the respective partial cavity 6a, 6b can be connected to an injection device (not shown) when the respective molding part 3, 4 is closed.

[0048] A method for coating component 2 for a current measurement or suppression device utilizes the injection molding tool 1 described above. Such a method comprises at least the following steps: - arranging the component 2 in the first cavity 5a of the first shaping part 3, so that a first partial cavity 6a is formed between the first shaping part 3 and the component 2, at least circumferentially around the outside of the component 2, - Adding a coating compound into the first partial cavity 6a, - Transferring the externally coated component 2 from the first shaping part 3 into the second shaping part 4, wherein the component 2 is arranged in the second cavity 5b of the second shaping part 4 such that the second partial cavity 6b is formed between the second shaping part 4 and the component 2 at least circumferentially around the inside of the component 2, - Adding a coating compound into the second partial cavity 6b. List of reference symbols 1 injection mold 2 components 3 First shaping part 3a First mold half (of the first molding part) 3b Second mold half (of the first molding part) 4 Second forming part 4a First mold half (of the second molding part) 4b Second mold half (of the second molding part) 5a First cavity (of the first molding part 5b Second cavity (of the second molding part) 6a First partial cavity (of the first molding part) 6b Second partial cavity (of the second molding part) 7' wall part (of the first mold half of the first molding part) 7'' wall part (of the second mold half of the first molding part) 8' bottom part (of the first mold half of the first forming part) 8'' bottom part (of the second mold half of the first molding part) 9' wall part (of the first mold half of the second molding part) 9'' wall part (of the second mold half of the second molding part) 10' bottom part (of the first mold half of the second molding part) 10'' bottom part (of the second mold half of the second forming part) 11' Central leg (of the first mold half of the second molding part) 11'' Central leg (of the second mold half of the second molding part) 12 Spring-loaded first stamp 13 First opening 14 Support element 15 Second opening 16 Central cavity (of the component) 17 First sealing surface 18 Second sealing surface 19 Outer surface (outer cylinder wall) 20 Inner surface (inner cylinder wall) 21 Spring-loaded second punch

Claims

[1] Injection molding tool (1) for coating a hollow component (2) for a device for current measurement or suppression, comprising - a first shaping part (3) and - a second shaping part (4), wherein the first shaping part (3) and the second shaping part (4) each have a first mold half (3a, 4a) and a second mold half (3b, 4b), wherein the first mold half (3a, 4a) and the second mold half (3b, 4b) each form a cavity (5a, 5b) for receiving the component (2) to be coated when the shaping part (3, 4) is closed, wherein the component (2) can be arranged in a first cavity (5a) of the first shaping part (3) in such a way that a first partial cavity (6a) is formed between the closed first shaping part (3) and the component (2) at least externally around the component (2), and wherein the component (2) can be arranged in a second cavity (5b) of the second shaping part (4) in such a way that between the closed second shaping part (4) and the component (2) a second partial cavity (6b) is formed at least inside the component (2) circumferentially. [2] Injection molding tool (1) according to claim 1, characterized by that the first mold half (3a) and the second mold half (3b) of the first shaping part (3) are each substantially pot-shaped with a circumferential wall part (7', 7'') and a base part (8', 8'') closing off the wall part (7', 7'') on one side, wherein when the first shaping part (3) is closed, the first mold half (3a) and the second mold half (3b) are sealingly connected in the region of the end faces of the wall parts (7', 7''). [3] Injection molding tool (1) according to claim 1 or 2, characterized byin that the first mold half (4a) and the second mold half (4b) of the second shaping part (4) are essentially pot-shaped with a circumferential wall part (9', 9'') and a base part (10', 10'') closing off the wall part (9', 9'') on one side, wherein a central cylindrical leg (11', 11'') extends from the base part (10', 10''), wherein when the second shaping part (4) is closed, the first mold half (4a) and the second mold half (4b) are sealingly connected in the region of the end faces of the wall parts (9', 9'') and the central cylindrical legs (11', 11''). [4] Injection molding tool (1) according to claim 1, 2 or 3, characterized byin that the first shaping part (3) has a spring-loaded first punch (12), wherein the spring-loaded first punch (12) is arranged in a first opening (13) of the first mold half (3a) of the first shaping part (3) when the first shaping part (3) is closed, such that it clamps the component (2) vertically against the second mold half (3b). [5] Injection molding tool (1) according to one of claims 1 to 4, characterized by in that the first shaping part (3) has a support element (14), wherein the support element (14) can be introduced into a central cavity (16) of the component (2) via a second opening (15) in the second mold half (3b) of the first shaping part (3) when the first shaping part (3) is closed and supports the component (2) horizontally. [6] Injection molding tool (1) according to claim 4 or 5, characterized bythat the first opening (13) for receiving the spring-loaded first punch (12) is formed centrally on the bottom part (8') of the first mold half (3a) of the first molding part (3) and the second opening (15) for introducing the support element (14) is formed centrally on the bottom part (8'') of the second mold half (3b) of the first molding part (3). [7] Injection molding tool (1) according to claim 6, characterized by that the bottom part (8') of the first mold half (3a) of the first shaping part (3) or the first punch (12) has at least one circumferential first sealing surface (17) and the bottom part (8'') of the second mold half (3b) of the first shaping part (3) has at least one circumferential second sealing surface (18) by means of which the first partial cavity (6a) is sealed when the first shaping part (3) is closed. [8] Injection molding tool (1) according to one of the preceding claims, characterized bythat in the first mold half (3a) and / or the second mold half (3b) of the first molding part (3) and in the first mold half (4a) and / or the second mold half (4b) of the second molding part (4) at least one channel is formed, via which the respective partial cavity (6a, 6b) can be connected to an injection device when the molding part (3, 4) is closed. [9] Injection molding tool (1) according to one of the preceding claims, characterized by that the first mold half (3a) of the first molding part (3) and the first mold half (4a) of the second molding part (4) are formed in one piece. [10] Injection molding tool (1) according to one of the preceding claims, characterized by that the second mold half (3b) of the first molding part (3) and the second mold half (4b) of the second molding part (4) are formed in one piece. [11] Method for coating a component (2) for a device for current measurement or suppression using the injection mold (1) according to one of claims 1 to 10, comprising at least the following steps: - arranging the component (2) in the first cavity (5a) of the first shaping part (3) so that a first partial cavity (6a) is formed between the first shaping part (3) and the component (2) at least circumferentially around the outside of the component (2), - Introducing a coating compound into the first partial cavity (6a), - transferring the externally coated component (2) from the first shaping part (3) into the second shaping part (4), wherein the component (2) is arranged in the second cavity (5b) of the second shaping part (4) in such a way that the second partial cavity (6b) is formed between the second shaping part (4) and the component (2) at least circumferentially on the inside around the component (2), - Adding a coating compound into the second partial cavity (6b).

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