Precision injection molds that facilitate the flow of adhesive in thin areas

Abstract

This invention provides a precision injection mold that facilitates glue flow in thin-film areas. It includes a lower mold base and an upper mold base. A lower mold core is located at the top of the lower mold base, and an upper mold core is located at the bottom of the upper mold base, forming an injection cavity between the lower and upper mold cores. A protrusion for forming a groove is provided on the side of the lower mold core near the upper mold core. A mounting groove is provided on the protrusion, and a venting steel block with ventilation is provided within the mounting groove. The outer surface of the venting steel block is flush with the outer surface of the protrusion. A support block is provided on the inner wall of the mounting groove, supporting the inner bottom surface of the venting steel block, thus forming a cavity between the venting steel block and the inner bottom surface of the mounting groove. A vent hole is provided on the lower mold core, connecting the cavity to the external space. This precision injection mold, by providing a venting steel block on the lower mold core for thin-film areas of the phone case, improves ventilation, facilitates glue flow, and thus improves the quality and production yield of the injection molded product.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular to a precision injection mold that facilitates the flow of glue in thin sheet areas. Background Technology

[0002] Modern smartphones often come with phone cases, which not only protect the phone but also serve as a key element in showcasing the product's aesthetic design and enhancing the user experience. To enhance functionality, phone cases often incorporate grooves, such as those for mounting magnets. However, this creates localized thin areas within the case. These thin areas have narrow flow channels and high flow resistance, hindering glue delivery and increasing the risk of incomplete filling. This can lead to warping, twisting, and other deformations. The presence of these thin areas poses a significant challenge to the injection molding process, potentially impacting product quality and production yield.

[0003] Therefore, there is a need to provide a precision injection mold that facilitates the flow of glue in thin sheet areas to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a precision injection mold that facilitates the flow of glue in thin areas, thereby solving the problem that in the prior art, when manufacturing mobile phone cases with thin areas using injection molds, there is a tendency for insufficient filling, which can lead to problems such as overall warping and twisting deformation, and easily affect the quality and production yield of injection molded products.

[0005] To solve the above technical problems, the technical solution of this utility model is: a precision injection mold that facilitates the flow of glue in thin sheet areas for injection molding of mobile phone cases, comprising: a lower mold base and an upper mold base, wherein a lower mold core is provided at the top of the lower mold base and an upper mold core is provided at the bottom of the upper mold base, and an injection cavity is formed between the lower mold core and the upper mold core; The lower mold core has a protrusion on the side near the upper mold core. The protrusion forms a groove on the inner side of the phone case. The protrusion has a mounting groove, and a breathable venting steel block is placed inside the mounting groove. The outer surface of the venting steel block is flush with the outer surface of the protrusion. A support block is provided on the inner sidewall of the mounting groove. The support block supports the inner bottom surface of the venting steel block, so that a cavity is formed between the venting steel block and the inner bottom surface of the mounting groove. The lower mold core has a vent hole, which connects the cavity to the external space.

[0006] In this invention, multiple support blocks spaced a predetermined distance apart are provided on the two opposite side walls of the mounting groove.

[0007] In this invention, the exhaust steel block has an exhaust groove on at least one side extending along its length, and the exhaust groove does not penetrate the outer surface of the exhaust steel block.

[0008] Optionally, the side of the exhaust steel block is provided with multiple exhaust grooves, the exhaust grooves extend along the thickness direction of the exhaust steel block, the exhaust grooves penetrate the inner bottom surface of the exhaust steel block, and the exhaust grooves communicate with the cavity.

[0009] Optionally, the exhaust groove includes multiple longitudinal grooves extending along the thickness direction of the exhaust steel block and at least one transverse groove extending along the length direction of the exhaust steel block. The transverse groove is interleaved and connected with the multiple longitudinal grooves, and the longitudinal groove is connected to the cavity.

[0010] Optionally, the exhaust steel block has a notch on its side extending along the width direction, the notch connecting to the cavity, and the exhaust groove extending along the length direction of the exhaust steel block, the exhaust groove connecting to the notch.

[0011] Furthermore, the exhaust channel has multiple bends.

[0012] In this invention, the exhaust steel block is interference-fitted with the mounting groove.

[0013] In this invention, the exhaust holes are arranged in the mounting groove at intervals of 12-18mm.

[0014] In this invention, the exhaust steel block is sintered using powder metallurgy technology, and the exhaust steel block contains a mesh-like through-hole structure with a diameter of 3-25 micrometers.

[0015] Compared with the prior art, the advantages of this utility model are as follows: The precision injection mold of this utility model, which is conducive to the flow of glue in thin sheet areas, improves the air permeability by setting venting steel blocks on the lower mold core for the thin sheet areas of the mobile phone shell, which is conducive to the flow of glue, thereby improving the quality and production yield of injection molded products. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0017] Figure 1 This is a schematic diagram of a preferred embodiment of the precision injection mold of the present invention, which facilitates the flow of adhesive in thin sheet areas.

[0018] Figure 2 This is a schematic diagram of the upper mold base and upper mold core in this utility model.

[0019] Figure 3 This is a partial structural diagram of the lower mold core in this utility model.

[0020] Figure 4This is a partial sectional view of the lower mold core in this utility model.

[0021] Figure 5 This is a schematic diagram of the first embodiment of the exhaust steel block in this utility model.

[0022] Figure 6 This is a schematic diagram of the second embodiment of the exhaust steel block in this utility model.

[0023] Figure 7 This is a schematic diagram of the third embodiment of the exhaust steel block in this utility model. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, a connection can be a detachable connection or a connection of an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In the current technology of injection molding, when manufacturing mobile phone cases with thin sheet areas, there is a tendency for insufficient filling defects, which can lead to problems such as overall warping and twisting deformation. The presence of thin sheet areas poses a serious challenge to the injection molding process and can easily affect the quality and production yield of injection molded products.

[0028] The following is a preferred embodiment of a precision injection mold that can solve the above-mentioned technical problems and facilitate the flow of glue in thin sheet areas.

[0029] Please refer to Figures 1-4 In the diagram, units with similar structures are represented by the same labels.

[0030] This embodiment provides a precision injection mold that facilitates the flow of glue in thin sheet areas for injection molding of mobile phone casing 14. It includes a lower mold base 11 and an upper mold base 12. The lower mold base 11 is provided with a lower mold core 13 at its top, and the upper mold base 12 is provided with an upper mold core 15 at its bottom. An injection cavity is formed between the lower mold core 13 and the upper mold core 15.

[0031] The lower mold core 13 has a protrusion 16 on the side close to the upper mold core 15. The protrusion 16 is used to form a groove on the inner side of the phone case 14. The groove can be used to set a magnetic piece. After the groove is formed on the phone case 14, the position of the phone case 14 corresponding to the groove is relatively thin.

[0032] In this embodiment, the protrusion 16 is provided with an installation groove 161, and an exhaust steel block 17 with air permeability is provided in the installation groove 161. The exhaust steel block 17 can be sintered by powder metallurgy technology. The exhaust steel block 17 contains a mesh through-hole structure with a diameter of 3-25 micrometers and a porosity of about 20%-30%, which has good air permeability.

[0033] The outer surface of the venting steel block 17 is flush with the outer surface of the protrusion 16, so that the inner surface of the groove after molding is relatively flat. A support block 162 is provided on the inner side wall of the mounting groove 161. The support block 162 supports the inner bottom surface of the venting steel block 17, so that a cavity 164 is formed between the venting steel block 17 and the inner bottom surface of the mounting groove 161. The lower mold core 13 is provided with a vent hole 163, which connects the cavity 164 and the external space, so that the venting steel block 17 can vent efficiently, which is conducive to glue flow and thus improves the molding quality of the thin sheet area of ​​the mobile phone case 14.

[0034] Please refer to Figure 4 In this embodiment, multiple support blocks 162 spaced at a predetermined distance are provided on the two opposite side walls of the mounting groove 161.

[0035] Please refer to Figures 5-7 In this embodiment, the exhaust steel block 17 has an exhaust groove on at least one side extending along its length, and the exhaust groove does not penetrate the outer surface of the exhaust steel block 17. The exhaust groove can improve the exhaust efficiency of the exhaust steel block 17.

[0036] The exhaust duct can be implemented in multiple ways.

[0037] Please refer to Figure 5 Optionally, the side of the exhaust steel block 17 is provided with multiple exhaust grooves 17a, the exhaust grooves 17a extend along the thickness direction of the exhaust steel block 17, the exhaust grooves 17a penetrate the inner bottom surface of the exhaust steel block 17, and the exhaust grooves 17a connect to the cavity 164.

[0038] Please refer to Figure 6Optionally, the exhaust groove includes multiple longitudinal grooves 17b1 extending along the thickness direction of the exhaust steel block 17 and at least one transverse groove 17b2 extending along the length direction of the exhaust steel block 17. The transverse groove 17b2 is interleaved with the multiple longitudinal grooves 17b1 and the longitudinal grooves 17b1 are connected to the cavity 164, resulting in high overall exhaust efficiency.

[0039] Please refer to Figure 7 Optionally, the exhaust steel block 17 has a notch 171 extending along its width, which connects to the cavity 164. The exhaust groove 17c extends along the length of the exhaust steel block 17 and connects to the notch 171. The exhaust groove 17c can have multiple bending structures, that is, the exhaust groove 17c can be bent and extended, which can improve the overall exhaust efficiency.

[0040] In this embodiment, the exhaust steel block 17 is interference-fitted with the mounting groove 161.

[0041] In this embodiment, vent holes 163 are arranged in the mounting groove 161 at intervals of 12-18mm to ensure efficient venting. It can be understood that when the length and width of the mounting groove 161 are both smaller than the sum of the diameters of the two vent holes 163 and the spacing between them, only one vent hole 163 needs to be provided in the mounting groove 161.

[0042] This preferred embodiment of the precision injection mold, which facilitates glue flow in thin-film areas, improves air permeability and glue flow by incorporating venting blocks on the lower mold core for the thin-film areas of the phone case. This, in turn, enhances the quality and production yield of the injection-molded product. Furthermore, the venting blocks in this embodiment can be flexibly configured with venting grooves of various structures on their sides, further improving venting efficiency and thus enhancing the molding quality of the thin-film areas of the phone case.

[0043] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A precision injection mold that facilitates the flow of adhesive in thin-film areas, used for injection molding mobile phone cases, characterized in that, include: The lower mold base and the upper mold base are provided with a lower mold core at the top and an upper mold core at the bottom of the upper mold base, forming an injection cavity between the lower mold core and the upper mold core; The lower mold core has a protrusion on the side near the upper mold core. The protrusion forms a groove on the inner side of the phone case. The protrusion has a mounting groove, and a breathable venting steel block is placed inside the mounting groove. The outer surface of the venting steel block is flush with the outer surface of the protrusion. A support block is provided on the inner sidewall of the mounting groove. The support block supports the inner bottom surface of the venting steel block, so that a cavity is formed between the venting steel block and the inner bottom surface of the mounting groove. The lower mold core has a vent hole, which connects the cavity to the external space.

2. The precision injection mold for facilitating the flow of glue in thin sheet areas according to claim 1, characterized in that, Multiple support blocks spaced a predetermined distance apart are provided on the two opposite side walls of the mounting groove.

3. The precision injection mold for facilitating the flow of glue in thin sheet areas according to claim 1, characterized in that, The exhaust steel block has an exhaust groove on at least one side extending along its length, and the exhaust groove does not penetrate the outer surface of the exhaust steel block.

4. The precision injection mold for facilitating the flow of glue in thin sheet areas according to claim 3, characterized in that, The side of the exhaust steel block is provided with multiple exhaust grooves, which extend along the thickness direction of the exhaust steel block, penetrate the inner bottom surface of the exhaust steel block, and communicate with the cavity.

5. The precision injection mold for facilitating glue flow in thin sheet areas according to claim 3, characterized in that, The exhaust groove includes multiple longitudinal grooves extending along the thickness direction of the exhaust steel block and at least one transverse groove extending along the length direction of the exhaust steel block. The transverse groove is intersected and connected with the multiple longitudinal grooves, and the longitudinal groove is connected to the cavity.

6. The precision injection mold for facilitating glue flow in thin sheet areas according to claim 3, characterized in that, The exhaust steel block has a notch on its side extending along the width direction, the notch connecting to the cavity, and the exhaust groove extends along the length direction of the exhaust steel block, the exhaust groove connecting to the notch.

7. The precision injection mold for facilitating the flow of glue in thin sheet areas according to claim 6, characterized in that, The exhaust channel has multiple bends.

8. The precision injection mold for facilitating the flow of glue in thin sheet areas according to claim 1, characterized in that, The exhaust steel block is interference-fitted with the mounting groove.

9. The precision injection mold for facilitating the flow of glue in thin sheet areas according to claim 1, characterized in that, The vent holes are arranged in the mounting groove at intervals of 12-18mm.

10. The precision injection mold for facilitating the flow of glue in thin sheet areas according to claim 1, characterized in that, The exhaust steel block is sintered using powder metallurgy technology, and the interior of the exhaust steel block contains a mesh-like through-hole structure with a diameter of 3-25 micrometers.

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