Die structure meeting special requirements of product finger position
By separating the detachable finger insert from the side core in the mold structure design, the precision and flexibility issues of the finger groove in traditional injection molding are solved, improving product quality and user experience, while increasing production efficiency and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN LVKE PLASTIC & RUBBER PROD CO LTD
- Filing Date
- 2025-04-15
- Publication Date
- 2026-05-05
AI Technical Summary
Traditional injection molding technology struggles to achieve high-precision molding and flexible replacement of finger grooves, resulting in defects such as burrs and rough edges, which affect product appearance and user experience, while also leading to low production efficiency.
The mold structure design includes a separate design for the detachable finger position insert and the side core. Through high-precision polishing and the cooperation between the detachable insert and the core, the smooth and rounded shape of the finger position groove is ensured, and the insert can be flexibly replaced to adjust the shape and depth according to product requirements.
It significantly improves the appearance and feel of the charger casing, enhances product design diversity and market competitiveness, while increasing production efficiency and reducing costs.
Smart Images
Figure CN224197210U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of injection molds, and in particular to a mold structure with special requirements for the finger positions of a product. Background Technology
[0002] With the rapid popularization of smart electronic devices, especially the widespread use of portable electronic products such as mobile phones and tablets, chargers, as essential accessories, have also undergone a transformation from single-function to multi-function, and from simple structure to sophisticated design. In order to meet users' growing demands for ease of use and comfort, charger design has gradually focused on ergonomics, especially in terms of grip and operating experience, with significant optimizations made.
[0003] During charger use, users typically need to grip the charger casing firmly with their fingers to plug and unplug devices. To improve grip stability and comfort, designers often incorporate finger grooves on the sides of the charger casing. However, traditional injection molding technology faces numerous technical challenges in implementing these finger grooves:
[0004] Molding precision is difficult to guarantee: Since the finger groove is usually located at the junction between the molding surface and the plane of the side core, the traditional fixed core design is difficult to achieve high-precision polishing, which may result in burrs or rough edges on the groove edge after injection molding, affecting the appearance and feel of the product.
[0005] Insufficient design flexibility: In traditional mold structures, the shape, depth, and curvature of the finger groove are directly determined by the core, making it difficult to quickly change or adjust according to different product requirements, thus limiting the diversity and adaptability of product design.
[0006] To address these issues, several improvements have emerged in the industry, such as using fixed inserts on the core. However, these solutions still have the following drawbacks: the method of fixing the inserts is complex, making it difficult to guarantee machining accuracy; replacing the inserts requires large-scale modifications to the mold, leading to increased production costs and low efficiency.
[0007] Therefore, how to optimize the mold structure design to achieve high-precision molding, flexible replacement, and improved injection molding efficiency of the finger groove has become a pressing technical challenge in the charger manufacturing industry. Utility Model Content
[0008] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.
[0009] This utility model provides a mold structure for products with special requirements for finger positions, including a mold core assembly and a core assembly that surround each other to form an injection cavity. The mold core assembly has a front mold core and a rear mold core, and the core assembly has a side core and a rear mold core. The two sets of side cores surround each other to form the side of the injection cavity. The front mold core has a front mold insert that forms the top surface of the injection cavity. One end of the rear mold core passes through the rear mold core and is inserted into the injection cavity. The side cores have finger inserts corresponding to the finger positions of the product. The finger inserts are detachably fixed to the side cores, thereby cooperating with the side cores to perform injection molding operations on the grooves of the finger positions of the product.
[0010] Furthermore: the side of the side core facing the injection molding cavity is set as a molding surface, which is used to injection mold the side of the shell product; a countersunk hole is provided on the molding surface corresponding to the finger position of the shell product, and the finger position insert is embedded in the countersunk hole to form a fixed connection.
[0011] Furthermore: the bottom of the countersunk hole is provided with a through hole extending to the back of the side core, and the finger position insert is connected and fixed to the insert threaded hole by bolts passing through the through hole.
[0012] Furthermore, the finger position insert has a curved protrusion at one end facing the injection molding cavity. This curved protrusion cooperates with the molding surface of the side core to form the finger position groove on the side of the injection molded shell product.
[0013] Furthermore: the cross-section of the molding surface is set to L-shape, and the two molding surfaces are joined together to form a quadrilateral cross-section, so as to injection mold a shell product with a quadrilateral cross-section.
[0014] Furthermore: the side core is provided with a first core and a second core. The first core is detachably fitted with a first insert to form a first groove on the outer side of the shell product. The second core is detachably fitted with a second insert to form a second groove on the other outer side of the shell product.
[0015] Furthermore: the two sets of side cores surround each other to form two injection cavities, which are used to mold two shell products respectively.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1. Significantly Improved Molding Quality: By separating the finger insert from the side core, both the insert and the core can be polished with high precision, avoiding the polishing dead angles caused by complex curved surfaces at the junction in traditional fixed structures. This design ensures that the edges of the finger groove are smooth and rounded, effectively avoiding defects such as burrs and rough edges, and significantly improving the appearance quality and user experience of the charger casing.
[0018] 2. Flexible and Diverse Design: The mold structure of this invention allows for the replacement of finger inserts according to different product models or specifications, thereby enabling diverse designs of the finger grooves in terms of shape, depth, curvature, etc. This flexibility not only enhances the product's personalization capabilities but also significantly improves its market competitiveness.
[0019] 3. Enhanced User Experience: The finger insert features a curved, raised design that matches the natural curvature of the user's fingers, providing a more comfortable grip and stable support. Meanwhile, the groove edges utilize a 0.1-0.3mm chamfered transition to ensure smooth melt flow, further improving the product's injection molding precision and the user experience.
[0020] 4. High-efficiency production and cost optimization: By setting two sets of molding surfaces on the same side core, this invention allows the mold to simultaneously form two charger housings, significantly improving production efficiency. Simultaneously, the detachable finger insert design reduces mold maintenance and replacement costs, lowering the unit production cost and providing manufacturers with a more economical production solution.
[0021] Therefore, this utility model effectively solves the problem of finger groove molding in traditional injection molding technology through innovative mold structure design and process solution, significantly improving product quality, design flexibility and user experience, while reducing production costs and maintenance complexity, and has important economic and social benefits.
[0022] 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
[0023] 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.
[0024] Figure 1 This is a structural schematic diagram of the mold core assembly and the core assembly of this utility model;
[0025] Figure 2 This is a schematic diagram of the structure of the front mold insert and the rear mold core of this utility model;
[0026] Figure 3 This is a schematic diagram of the structure of the first core and the second core of this utility model;
[0027] Figure 4This is a schematic diagram of the cross-sectional structure of the side core and finger position insert of this utility model;
[0028] Figure 5 This is a schematic diagram of the countersunk hole and finger position insert of this utility model;
[0029] Figure 6 This is a schematic diagram of the structure of the first insert and the second insert of this utility model;
[0030] Figure 7 This is a cross-sectional structural diagram of the shell product and the finger position insert of this utility model;
[0031] Figure 8 This is a schematic diagram of the structure of the finger position groove and the curved protrusion of this utility model.
[0032] The reference numerals and names in the figure are as follows:
[0033] 10 Mold core assembly; 11 Front mold core; 12 Front mold insert; 13 Rear mold core; 20 Core assembly; 21 Rear mold core; 22 Side core; 23 Bolt; 24 Molding surface; 25 Countersunk hole; 26 Finger position insert; 27 Curved protrusion; 30 First core; 31 First insert; 32 First groove; 33 Second core; 34 Second insert; 35 Second groove; 40 Housing product; 41 Finger position groove. Detailed Implementation
[0034] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0035] Please see Figures 1 to 8 In this embodiment of the present invention, a mold structure for a product with special requirements for the finger position includes a mold core assembly 10 and a core assembly 20 that surround each other to form an injection cavity. The mold core assembly 10 has a front mold core 11 and a rear mold core 13. The core assembly 20 has a side core 22 and a rear mold core 21. The two sets of side cores 22 surround each other to form the side of the injection cavity. The front mold core 11 has a front mold insert 12, which forms the top surface of the injection cavity. One end of the rear mold core 21 passes through the rear mold core 13 and is inserted into the injection cavity. The side core 22 has a finger position insert 26 corresponding to the finger position of the product. The finger position insert 26 is detachably fixed to the side core 22, thereby cooperating with the side core 22 to perform injection molding operation on the groove of the finger position of the product.
[0036] Specifically, with the increasing popularity of electronic products, corresponding chargers have also been widely used. Chargers need to be plugged into an AC power outlet for use, and users need to grip the charger casing firmly to plug and unplug it. To prevent slippage when gripping the charger casing, it is preferable to provide finger grooves 41 on the side of the casing. These grooves allow users' fingers to grip the casing more easily, enabling better force application and facilitating plugging and unplugging.
[0037] Secondly, in order to form the corresponding finger groove 41 during the injection molding process, a protrusion needs to be set at the corresponding position of the side core 22. Since the side core 22 needs to form the side of the shell, its forming surface 24 is usually set as a plane, which makes it difficult to polish the junction between the finger protrusion and the forming surface 24. It is impossible to achieve a smooth injection molding transition effect at the edge of the finger groove 41, and it may even easily cause burrs or rough edges to form in the finger groove 41 part of the charger shell, affecting the aesthetics of the final product. Therefore, it is necessary to make improvements.
[0038] Furthermore, by providing a detachable finger-position insert 26 at the location of the side core 22 corresponding to the finger-position groove 41, both the insert and the side core 22 can be polished separately. Since the insert and side core 22 can be processed separately, the curved protrusion 27 of the insert and the core plane can be polished with high precision, avoiding polishing dead angles caused by the complex structure at the junction. After meeting the requirements for injection molding, the two are then combined and fixed, thereby improving the problem of the edge between the side core 22 and the protrusion not forming a sharp angle, eliminating the problem of burr residue, improving the smoothness of the shell side, providing a better grip, and making insertion and removal easier, thus enhancing the user experience.
[0039] In addition, the mold structure includes a mold core assembly 10 (for forming the main outline of the product) and a core assembly 20 (for forming local features and core-pulling structure of the product). The mold core assembly 10 is composed of a front mold core 11 and a rear mold core 13, and the core assembly 20 is composed of a side core 22 and a rear mold core 21.
[0040] like Figures 3 to 5 As shown, preferably, the side of the side core 22 facing the injection molding cavity is set as the molding surface 24, and the molding surface 24 is used to injection mold the side of the shell product 40; the molding surface 24 is provided with a countersunk hole 25 corresponding to the finger position of the shell product 40, and the finger position insert 26 is embedded in the countersunk hole 25 and forms a fixed connection.
[0041] Specifically, in order to facilitate the installation and fixing of the finger position insert 26, it is preferable to provide a corresponding countersunk hole 25 on the molding surface 24 of the side core 22 so that the finger position insert 26 can be fixedly installed in the countersunk hole 25. Moreover, the finger position insert 26 can be replaced according to the different models or specifications of the housing product 40, thereby forming finger position grooves 41 with different shapes, depths and curvatures, enriching the appearance of the housing product 40.
[0042] like Figure 5 As shown, preferably, the bottom of the countersunk hole 25 is provided with a through hole extending to the back of the side core 22, and the finger position insert 26 is connected and fixed to the insert threaded hole by a bolt 23 passing through the through hole.
[0043] Specifically, to facilitate the fixing of the finger position insert 26, preferably, a through hole is provided between the bottom of the countersunk hole 25 and the side of the side core 22 away from the injection molding cavity. A threaded hole is provided at the end of the finger position insert 26 away from the injection molding cavity, and a bolt 23 is provided in the through hole, so that the bolt 23 passes through the through hole and forms a threaded connection with the threaded hole, thereby fixing the finger position insert 26 in the countersunk hole 25 of the side core 22. This is equivalent to having a corresponding through hole on the side core 22, and then setting a bolt 23 of appropriate length. After the bolt 23 passes through the through hole, it forms a threaded connection with the threaded hole of the finger position insert 26, thus forming a detachable and separable fixed connection. This allows for convenient fixing and also allows for the replacement of the finger position insert 26 according to the specific needs of the finger position groove 41 of the housing product 40.
[0044] like Figure 5 , Figure 7 and Figure 8 As shown, preferably, the finger position insert 26 has a curved protrusion 27 at one end facing the injection molding cavity. The curved protrusion 27 cooperates with the molding surface 24 of the side core 22 to injection mold the finger position groove 41 on the side of the shell product 40.
[0045] Specifically, to make the finger groove 41 closer to the user's fingertip, it is preferable to set one end of the injection-molded finger groove 41 of the finger insert 26 as a curved protrusion 27, so that the finger groove 41 is formed into a curved groove with a certain curvature, which fits the shape of the fingertip perfectly, improving the user's grip comfort. The edge of the curved protrusion 27 and the molding surface 24 adopt a transition chamfer of 0.1-0.3mm to ensure smooth melt flow during injection molding.
[0046] As shown in the figure, preferably, the cross-section of the molding surface 24 is set to L-shape, and the two molding surfaces 24 are joined together to form a quadrilateral cross-section, so as to injection mold a shell product 40 with a quadrilateral cross-section.
[0047] Specifically, in order to reduce the number of side cores 22, an L-shaped molding surface 24 can be set on one side core 22. After two L-shaped molding surfaces 24 are joined together, they form a quadrilateral injection cavity, thereby injection molding a shell product 40 with a quadrilateral cross-section.
[0048] like Figure 3 and Figure 6 As shown, preferably, the side core 22 is provided with a first core 30 and a second core 33. The first core 30 is detachably mounted with a first insert 31, thereby forming a first groove 32 on the outer side of the shell product 40. The second core 33 is detachably mounted with a second insert 34, thereby forming a second groove 35 on the other outer side of the shell product 40.
[0049] Specifically, since users usually use their fingers to hold the charger from both sides when using it, it is preferable to provide finger grooves 41 on both sides of the housing product 40. Therefore, correspondingly, a first insert 31 and a second insert 34 need to be provided on the two sets of side cores 22 respectively, so as to form the first groove 32 and the second groove 35 on both sides of the housing product 40.
[0050] like Figures 1 to 3 As shown, preferably, the two sets of side cores 22 surround each other to form two injection molding cavities, which respectively form two shell products 40.
[0051] Specifically, to improve injection molding efficiency, it is preferable to set two sets of molding surfaces 24 on the same side core 22, so that after the two sets of side cores 22 are joined together, two independent injection cavities can be formed. Combined with two independent sets of front mold inserts 12 and two sets of rear mold cores 21, and the cooperation of the front mold core 11 and the rear mold core 13, two shell products 40 can be injection molded simultaneously, improving production efficiency. This is equivalent to the two sets of side cores 22 being symmetrically arranged, and after being joined together, they are separated into two independent cavities by a middle partition. The partition, together with the front and rear mold cores 13, constitutes a complete parting surface.
[0052] In addition, in order to form a complete injection mold, existing mold systems such as gating system, guiding system, molding system, core pulling system, ejection system, and cooling system can be set up to cooperate with each other to complete the injection molding operation of the shell product 40.
[0053] 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 mold structure for products with special requirements for finger positions, characterized in that, The mold core assembly (10) and the mold core assembly (20) are arranged to form an injection cavity. The mold core assembly (10) is provided with a front mold core (11) and a rear mold core (13). The mold core assembly (20) is provided with a side mold core (22) and a rear mold core (21). The two sets of side mold cores (22) are arranged to form the side of the injection cavity. The front mold core (11) is provided with a front mold insert (12), which forms the top surface of the injection cavity. One end of the rear mold core (21) passes through the rear mold core (13) and is inserted into the injection cavity. The side mold core (22) is provided with a finger insert (26) corresponding to the finger position of the product. The finger insert (26) is detachably fixed to the side mold core (22) so as to cooperate with the side mold core (22) to perform injection molding operation on the groove of the finger position of the product.
2. The mold structure for product finger positions according to claim 1, characterized in that, The side core (22) facing the injection cavity is set as a molding surface (24), which is used to injection mold the side of the shell product (40); a countersunk hole (25) is provided on the molding surface (24) corresponding to the finger position of the shell product (40), and the finger position insert (26) is embedded in the countersunk hole (25) and forms a fixed connection.
3. The mold structure for product finger positions according to claim 2, characterized in that, The bottom of the countersunk hole (25) is provided with a through hole that extends to the back of the side core (22). The finger position insert (26) is fixed by bolts (23) passing through the through hole and connecting to the threaded hole of the insert.
4. The mold structure for product finger positions according to claim 1, characterized in that, The finger position insert (26) has a curved protrusion (27) at one end facing the injection cavity. The curved protrusion (27) cooperates with the molding surface (24) of the side core (22) to form the finger position groove (41) on the side of the injection molded shell product (40).
5. The mold structure for product finger positions according to claim 2, characterized in that, The cross-section of the molding surface (24) is set to L-shape, and the two molding surfaces (24) are joined together to form a quadrilateral cross-section, so as to injection mold a shell product (40) with a quadrilateral cross-section.
6. The mold structure for product finger positions according to claim 1, characterized in that, The side core (22) is provided with a first core (30) and a second core (33). The first core (30) is detachably equipped with a first insert (31) to form a first groove (32) on the outer side of the shell product (40). The second core (33) is detachably equipped with a second insert (34) to form a second groove (35) on the other outer side of the shell product (40).
7. The mold structure for a product with special finger position requirements according to claim 1, characterized in that, Two sets of side cores (22) surround each other to form two injection cavities, which respectively form two shell products (40).