Forming die for ear caps

Abstract

The utility model discloses a kind of forming mould of ear cap, it is related to mould technical field, including upper die plate and lower die plate, the upper die plate and lower die plate can be docked cooperation;First protruding part is protruded to the side of the parting surface of the upper die plate and towards lower die plate, plug for the sleeve joint ear cap inner layer structure is connected on the first protruding part, cavity is formed with recess on the parting surface of the lower die plate, the bottom of the cavity is protruded with second protruding part;When the upper die plate and lower die plate are docked, the plug is inserted into the cavity, and the end of the plug away from first protruding part is in abutment with second protruding part, forming gap for forming ear cap outer layer structure is formed between the outer periphery of the plug and the inner wall of cavity;Plug is used as positioning carrier, can stably sleeve joint ear cap inner layer structure to ensure that outer layer structure is evenly wrapped, and the cooperation relationship of itself and mould is also convenient for stripping operation.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a molding mold for ear caps. Background Technology

[0002] As a key accessory for headphones and other audio devices, the ear tips' structural design and material selection significantly impact wearing comfort, noise isolation, and fit stability. Currently, a composite ear tip design exists in the industry. This type of ear tip typically employs an inner and outer layer combined, with an overall hollow, through-hole structure. This design not only better fits the headphone body but also enhances the user experience through the dual-layer structure, making it widely used in the audio equipment field.

[0003] In the production of this type of composite ear cap, mold forming is the mainstream processing method. Existing molds are mostly composed of interlocking upper and lower templates, and the ear cap is formed through the cooperation of protrusions, cavities, and other structures on the templates. However, existing molds still have significant shortcomings in actual use: On the one hand, the design of the components used to position the inner layer structure of the ear cap is not reasonable enough. They rely solely on simple protrusions or support structures to limit the inner layer structure, lacking a stable positioning and cooperation relationship. This causes the inner layer structure to easily shift in position during subsequent processing stages such as glue filling and mold closing, resulting in uneven wrapping of the outer layer structure over the inner layer. This affects the overall structural stability and product consistency of the ear cap, increasing the defect rate. On the other hand, the removal operation of the ear cap after molding has not been optimized.

[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] An ear cap forming mold includes an upper template and a lower template, wherein the upper template and the lower template can be mated together; The upper template has a first protrusion on the parting surface facing the lower template. A plug for fitting the inner layer structure of the ear cap is connected to the first protrusion. A cavity is formed in the parting surface of the lower template. A second protrusion is formed at the bottom of the cavity. When the upper template and the lower template are aligned, the plug extends into the cavity, and the end of the plug away from the first protrusion abuts against the second protrusion. A forming gap is formed between the outer periphery of the plug and the inner wall of the cavity for forming the outer layer structure of the ear cap.

[0007] As a further embodiment of this utility model: the top of the plug is provided with a first cavity that matches the shape of the first protrusion, and the first protrusion is inserted into the first cavity to form an interference fit.

[0008] As a further embodiment of this utility model: the bottom end of the plug is provided with a second concave cavity that matches the shape of the second protrusion, and the second protrusion is inserted into the second concave cavity to form an interference fit.

[0009] As a further embodiment of this utility model: a continuous surrounding molding gap is formed between the outer peripheral surface of the plug and the inner wall of the cavity.

[0010] As a further embodiment of this utility model: a flared portion is formed at the upper edge of the cavity, and the inner diameter of the flared portion is larger than the inner diameter of the cavity.

[0011] As a further embodiment of this utility model: the parting surface of the lower template is provided with multiple cavities, and the cavities are arranged in an array; The upper template has the same number of first protrusions on the parting surface corresponding to each cavity, and each first protrusion is connected to a plug.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: The plug adopts an independent structural design, with its first and second concave cavities at both ends fitting into the first protrusion of the upper template and the second protrusion of the lower template, respectively. The structure is simple and easy to process and manufacture. As a positioning carrier, the plug can stably fit the inner layer structure of the ear cap to ensure that the outer layer structure is evenly wrapped. Its fit with the mold also facilitates demolding. Combined with the cavity flaring design, it can further reduce the difficulty of removing parts and reduce product damage.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a composite ear cap; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram of the structure of the lower template in this utility model; Figure 4 yes Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the upper template in this utility model.

[0016] The reference numerals and names in the figure are as follows: 1. Upper template; 2. Lower template; 3. First protrusion; 4. Plug; 5. Cavity; 6. Second protrusion; 7. Molding gap; 8. First concave cavity; 9. Second concave cavity; 10. Flared opening. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-5 In this embodiment of the utility model, a molding die for an ear cap is provided to realize the molding process of a composite hollow ear cap. The die is mainly composed of an upper template 1 and a lower template 2. The upper template 1 and the lower template 2 can be connected to form a closed molding space to meet the integrated molding requirements of the inner and outer structures of the ear cap.

[0019] On the parting surface of the upper mold 1 facing downwards, a first protrusion 3 is provided. The first protrusion 3 extends in the direction close to the lower mold 2, and its outer periphery is used to connect a plug 4. The core function of the plug 4 is to fit the inner layer structure of the ear cap during the molding process, providing stable support and positioning for the inner layer structure. To ensure a stable connection between the plug 4 and the first protrusion 3 and to avoid relative displacement during the molding process, a first cavity 8 is provided at the top of the plug 4. The shape of the first cavity 8 is adapted to the shape of the first protrusion 3. When the plug 4 is assembled to the upper mold 1, the end of the first protrusion 3 away from the upper mold 1 is inserted into the first cavity 8, and the two form an interference fit. Through the interference fit structural design, the plug 4 and the first protrusion 3 can fit tightly together, and even if subjected to external forces during glue pouring and mold closing, they will not loosen or shift, thereby ensuring the positional accuracy of the inner layer structure of the ear cap.

[0020] On the parting surface of the lower mold 2 facing upwards, a cavity 5 is recessed, which defines the shape of the outer layer structure of the ear cap. The inner wall contour of the cavity 5 is consistent with the design shape of the outer layer structure of the ear cap to be formed. At the bottom center of the cavity 5, a second protrusion 6 is provided, which extends in the direction close to the upper mold 1, and its axis is collinear with the axis of the cavity 5. Correspondingly, a second recess 9 is provided at the bottom end of the plug 4. The shape of the second recess 9 is adapted to the shape of the second protrusion 6. When the mold is in the mating state, the end of the second protrusion 6 away from the bottom of the cavity 5 is inserted into the second recess 9, and the two also form an interference fit. This mating structure can further position and support the plug 4 from below, ensuring that the plug 4 is coaxial in the cavity 5, and avoiding the problem of uneven wall thickness between the inner and outer layers of the ear cap due to the tilting of the plug 4.

[0021] When the upper template 1 and the lower template 2 are connected, the plug 4, which is fitted with the inner layer structure of the ear cap, will extend into the cavity 5 as a whole. At this time, the end of the plug 4 away from the first protrusion 3 abuts against the second protrusion 6 (due to the above interference fit, the abutting and fixing is achieved). A continuous ring of molding gap 7 is formed between the outer circumferential surface of the plug 4 and the inner wall of the cavity 5. The width of the molding gap 7 matches the design thickness of the outer layer structure of the ear cap. During the molding process, the material used to form the outer layer structure of the ear cap will fill into the molding gap 7. After the material is cured, an outer layer structure that wraps around the outer side of the inner layer structure can be formed, and the molding of the composite ear cap is finally completed.

[0022] In one embodiment, after the mold is formed, it enters the demolding stage, at which point the upper mold plate 1 and the lower mold plate 2 are separated. Since the plug 4 and the first protrusion 3 are interference-fitted, and the inner layer of the ear cap is pre-fitted onto the outer periphery of the plug 4, a certain adhesive force is formed between the ear cap and the plug 4. Therefore, when separating the upper mold plate 1 and the lower mold plate 2, the plug 4 moves upward along with the upper mold plate 1, simultaneously causing the formed ear cap to detach from the cavity 5 of the lower mold plate 2. After the upper mold plate 1 and the lower mold plate 2 are completely separated, the operator can remove the plug 4 from the first protrusion 3 using external force—due to the fit between the plug 4 and the inner layer of the ear cap, the ear cap will be removed along with the plug 4 during the removal process, thus separating the ear cap from the mold.

[0023] Regarding the product's position during demolding, it needs to be explained in conjunction with the actual design parameters of the interference fit: the interference between the plug 4 and the first protrusion 3 is designed to be slightly greater than the interference between the plug 4 and the second protrusion 6. This design difference makes it easier for the plug 4 to separate from the second protrusion 6 when the upper mold plate 1 separates from the lower mold plate 2, while maintaining its connection with the first protrusion 3, thus allowing it to move with the upper mold plate 1. If the interference fits are the same, the plug 4 may get stuck on the second protrusion 6 or the first protrusion 3, unable to move stably with either mold plate. By reasonably setting the difference in interference fits, this contradiction can be avoided, ensuring a smooth demolding process.

[0024] In another embodiment, the interference fit between the plug 4 and the second protrusion 6 is designed to be slightly larger than the interference fit between the plug 4 and the first protrusion 3. In this case, when the upper template 1 separates from the lower template 2, the plug 4 remains inside the cavity 5 of the lower template 2, and the ear cap also remains inside the cavity 5 due to its close fit with the plug 4. To facilitate removal in such situations, a flared portion 10 extends from the upper edge of the cavity 5. The flared portion 10 and the cavity 5 are integrally formed, and its inner diameter is larger than the inner diameter of the main body of the cavity 5. The flared portion 10 provides sufficient operating space for the operator or removal tool, allowing it to directly extend into the upper part of the cavity 5 to apply external force to the plug 4 (at which point the plug 4 can act as a force-bearing end, thus applying force without affecting the ear cap), causing the ear cap to come out of the cavity 5 along with the plug 4. This avoids interference between the removal tool and the edge of the cavity 5 due to the narrow opening of the cavity 5, or damage to the edge of the ear cap due to improper force application. Even when the plug 4 moves with the upper template 1, the flared part 10 can provide transition space for the ear cap to detach from the cavity 5 in the initial separation stage, avoiding the edge of the ear cap from rubbing against the upper end of the cavity 5, thus protecting the product.

[0025] To improve production efficiency and meet the needs of mass production, multiple cavities 5 are provided on the parting surface of the lower mold plate 2. The cavities 5 are arranged in an array, and the spacing between adjacent cavities 5 is consistent to ensure that the overall mold is subjected to uniform force and to avoid deviations in the forming accuracy of a certain cavity 5 due to uneven force during mold closing. Correspondingly, on the parting surface of the upper mold plate 1, the same number of first protrusions 3 are provided at positions corresponding to each cavity 5. Each first protrusion 3 is connected to a plug 4, and the structural parameters of each plug 4 (including shape, size, and specifications of the first cavity 8 and the second cavity 9) are consistent. When the mold is closed, each plug 4 will extend into the corresponding cavity 5 and cooperate with the second protrusion 6 in the corresponding cavity 5, thereby completing the forming of multiple ear caps simultaneously. During demolding, each plug 4 will move synchronously with the upper mold plate 1, causing multiple ear caps to detach from the cavity 5 simultaneously (or remain in the cavity 5 as in another embodiment), effectively shortening the single production cycle and increasing the product output per unit time.

[0026] In the above embodiments, the inner layer structure of the ear cap can be made of silicone material, that is, the inner layer structure is a silicone sleeve. By placing the silicone sleeve on the outer periphery of the plug 4, the processing before the outer layer structure is formed can be realized. The outer layer structure can be designed with corresponding injection / pouring materials such as waterproof and wear-resistant materials according to the needs of the product.

[0027] In summary, by adopting an independent structural design, the first concave cavity 8 and the second concave cavity 9 at both ends of the plug 4 are adapted to fit the first protrusion 3 of the upper template 1 and the second protrusion 6 of the lower template 2, respectively. The structure is simple and easy to process and manufacture. As a positioning carrier, the plug 4 can stably fit the inner layer structure of the ear cap to ensure that the outer layer structure is evenly wrapped. Its own fit with the mold also facilitates demolding operations. With the design of the flared part 10 of the cavity 5, the difficulty of removing the part can be further reduced and product damage can be reduced.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A molding die for ear caps, characterized in that, It includes an upper template and a lower template, which can be connected and fitted together; The upper template has a first protrusion on the parting surface facing the lower template. A plug for fitting the inner layer structure of the ear cap is connected to the first protrusion. A cavity is formed in the parting surface of the lower template. A second protrusion is formed at the bottom of the cavity. When the upper template and the lower template are aligned, the plug extends into the cavity, and the end of the plug away from the first protrusion abuts against the second protrusion. A forming gap is formed between the outer periphery of the plug and the inner wall of the cavity for forming the outer layer structure of the ear cap.

2. The ear cap molding die according to claim 1, characterized in that, The top of the plug has a first cavity that matches the shape of the first protrusion, and the first protrusion is inserted into the first cavity to form an interference fit.

3. The ear cap molding die according to claim 2, characterized in that, The bottom end of the plug has a second cavity that matches the shape of the second protrusion, and the second protrusion is inserted into the second cavity to form an interference fit.

4. The ear cap molding die according to claim 3, characterized in that, A continuous, circumferential molding gap is formed between the outer periphery of the plug and the inner wall of the cavity.

5. A molding die for an ear cap according to any one of claims 1-4, characterized in that, A flared portion extends from the upper edge of the cavity, and the inner diameter of the flared portion is larger than the inner diameter of the cavity.

6. A molding die for an ear cap according to any one of claims 1-4, characterized in that, The lower template has multiple cavities on its parting surface, and the cavities are arranged in an array. The upper template has the same number of first protrusions on the parting surface corresponding to each cavity, and each first protrusion is connected to a plug.

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