High-quality precision injection molds

Abstract

This invention provides a high-quality precision injection mold, comprising an upper mold base, a lower mold base, an upper mold core, a lower mold core, a gating assembly, and a side-mounted injection manifold. The side-mounted injection manifold is located on one side of the lower mold core, and its surface is provided with a sprue channel, which connects to the output end of the gating assembly. The buffer channel portion of the sprue channel has a curved and extended structure, and the injection channel portion connects the buffer channel portion and the injection cavity. Along the direction from the buffer channel portion towards the injection cavity, the width of the injection channel portion gradually increases. This invention uses the curved and extended buffer channel portion on the side-mounted injection manifold to inject material into the injection cavity, reducing the impact force during injection. The material can be smoothly propelled in a laminar flow in the same direction and fill the injection cavity, resulting in uniform cooling and shrinkage, avoiding concentrated internal stress within the product, thereby reducing the risk of product warping and deformation, and giving the product a smooth surface finish.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular to a high-quality precision injection mold. Background Technology

[0002] When injection molding larger products, the significant shrinkage and difficulty in controlling dimensional standards increase manufacturing complexity, as seen in products like large mobile phone and tablet casings. Existing injection molds typically inject the glue from the center of the cavity, causing it to flow radially in all directions. This uneven flow, with varying molecular chain orientations and shrinkage rates, results in molded products prone to unevenness and warping.

[0003] Therefore, it is necessary to provide a high-quality precision injection mold to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a high-quality precision injection mold to solve the problem that, when injection molds are used to mold larger products, the products are prone to unevenness and warping.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-quality precision injection mold, which includes: an upper mold base, a lower mold base, an upper mold core, a lower mold core, a gating assembly, and a side-mounted injection block; The upper mold core is disposed at the bottom of the upper mold base, and the lower mold core is disposed at the top of the lower mold core. An injection cavity is formed between the lower mold core and the upper mold core. The side injection guide block is located on the side of the lower mold core near the upper mold core. The surface of the side injection guide block is provided with a sprue channel communicating with the injection cavity. The upper mold core and the side injection guide block are in surface contact to close the sprue channel. The gating assembly is disposed in the upper mold base, and the sprue channel is connected to the output end of the gating assembly. The gating system includes a buffer runner and a glue inlet runner. The buffer runner has a curved and extended structure. The glue inlet runner connects the buffer runner and the injection cavity. One end of the buffer runner away from the glue inlet runner is connected to the output end of the gating assembly. The width of the glue inlet runner gradually increases along the direction from the buffer runner to the injection cavity.

[0006] In this invention, the buffer channel portion is bent and extended into a U-shaped structure, and the bent and extended buffer channel portion forms a first straight section, a second straight section, and a curved section connecting the first straight section and the second straight section.

[0007] The output end of the casting assembly is connected to the first straight section, and the glue inlet channel is connected to the side of the second straight section.

[0008] Furthermore, the flow channel length of the second straight section is greater than the flow channel length of the first straight section.

[0009] In addition, the length of the glue inlet channel portion that communicates with the second straight section portion is less than the length of the second straight section portion, and the end of the second straight section portion away from the curved portion has a margin channel portion of a set length, which is not connected to the glue inlet channel portion.

[0010] In this invention, the depth of the buffer channel is greater than the depth of the glue inlet channel.

[0011] In this invention, a lower protrusion is provided on the side of the injection mold cavity near the injection channel, the lower protrusion is located inside the injection channel, and an upper protrusion is provided on the upper mold core corresponding to the lower protrusion.

[0012] In this utility model, the lower mold core includes a mold core frame block and a mold core body block that is detachably disposed inside the mold core frame block. The side glue injection block and the mold core frame block are integrally formed structures.

[0013] In this invention, a cold material well is provided on the inner bottom surface of the buffer flow channel, and the cold material well is opposite to the output end of the casting assembly.

[0014] In this invention, the output end of the casting component is an output nozzle that penetrates the upper mold core.

[0015] Compared with the prior art, the advantages of this utility model are as follows: The high-quality precision injection mold of this utility model uses a side guide block and a buffer flow channel with a curved extension structure to inject the material into the injection cavity. This reduces the impact force when injecting the material, and the material can be smoothly propelled in the same direction and fill the injection cavity in a laminar flow manner. The cooling and shrinkage are uniform, avoiding the generation of concentrated internal stress inside the product, thereby reducing the risk of product warping and deformation, and the product has a smooth surface quality. 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 high-quality precision injection mold of this utility model.

[0018] Figure 2 This is a schematic diagram of the upper mold core, lower mold core, gating assembly, and side injection block of this utility model.

[0019] Figure 3 This is a schematic diagram of the upper mold core, lower mold core, and side glue injection block in this utility model.

[0020] Figure 4 This is a partial structural diagram of the lateral glue inlet guide block in this utility model.

[0021] Figure 5 This is a partial cross-sectional view of the gate and runner of the injection mold after mold closing in this utility model. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, a connection can be a detachable connection or a connection of an integral structure; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an 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.

[0026] In existing injection molds, the glue is generally injected from the center of the cavity and flows radially in all directions. The flow direction and speed of the glue are different and uneven. The molecular chain orientation and shrinkage rate are inconsistent in different directions. This makes the molded product prone to unevenness and warping.

[0027] The following is a preferred embodiment of a high-quality precision injection mold provided by this utility model, which can solve the above-mentioned technical problems.

[0028] Please refer to Figure 1 , Figure 2 and Figure 3 In the diagram, units with similar structures are represented by the same labels.

[0029] This embodiment provides a high-quality precision injection mold, which includes: an upper mold base 11, a lower mold base 12, an upper mold core 13, a lower mold core 15, a gating assembly 14, and a side-mounted injection block 16.

[0030] An upper mold core 13 is located at the bottom of an upper mold base 11, and a lower mold core 15 is located at the top of the lower mold core 15, forming an injection cavity 17 between the lower mold core 15 and the upper mold core 13. A side injection manifold 16 is located on the side of the lower mold core 15 near the upper mold core 13, and the surface of the side injection manifold 16 is provided with a sprue channel 161 that communicates with the injection cavity 17. The upper mold core 13 and the side injection manifold 16 are in surface contact to close the sprue channel 161. A gating assembly 14 is located inside the upper mold base 11, and the sprue channel 161 communicates with the output end of the gating assembly 14.

[0031] Please refer to Figure 4 In this embodiment, the gate runner 161 includes a buffer runner section 1611 and a glue inlet runner section 1612. The buffer runner section 1611 has a curved and extended structure, which can provide a good buffering effect for the incoming glue material and improve the injection molding quality. The glue inlet runner section 1612 connects the buffer runner section 1611 and the injection cavity 17. The end of the buffer runner section 1611 away from the glue inlet runner section 1612 is connected to the output end of the gating assembly 14. Along the direction from the buffer runner section 1611 to the injection cavity 17, the width of the glue inlet runner section 1612 gradually increases.

[0032] Lateral injection allows for the injection of material into the molding cavity at lower pressure. The gate channel 161 is positioned away from the product surface, reducing the impact force during injection and preventing concentrated internal stress within thick-walled parts, thus lowering the risk of warpage. Simultaneously, the material flows smoothly in a unidirectional laminar flow pattern, steadily filling the injection cavity 17. With all molecular chains having roughly the same orientation, cooling and shrinkage are relatively uniform. This uniform shrinkage significantly reduces uneven stress within the product, greatly minimizing the risk of warpage and avoiding jetting marks, resulting in a smooth surface finish.

[0033] In addition, the material is injected from one side, and the air is pushed to the other side. A venting groove can be opened on the side opposite to the sprue runner 161 between the lower mold base 12 and the upper mold core 13, so that the venting path is clear and well-defined and the venting efficiency is high.

[0034] Please refer to Figure 4 In this embodiment, the buffer channel portion 1611 is curved and extended into a U-shaped structure, forming a first straight section 16111, a second straight section 16112, and a curved section 16113 connecting the first straight section 16111 and the second straight section 16112. The buffer channel portion 1611 forms a very smooth curve, which can not only provide a good buffering effect for the injected adhesive, but also allow the adhesive to flow smoothly.

[0035] The output end of the casting assembly 14 is connected to the first straight section 16111, and the glue inlet channel 1612 is connected to the side of the second straight section 16112.

[0036] Furthermore, the flow channel length of the second straight section 16112 is greater than the flow channel length of the first straight section 16111.

[0037] Furthermore, the length of the section connecting the injection runner 1612 and the second straight section 16112 is less than the length of the second straight section 16112. The end of the second straight section 16112 away from the curved section 16113 has a predetermined length of allowance runner, which is not connected to the injection runner 1612. This ensures that the second straight section 16112 contains sufficient adhesive material, guaranteeing the stability of adhesive supply to the injection runner 1612 and improving injection molding quality.

[0038] In this embodiment, the depth of the buffer flow channel 1611 is greater than the depth of the glue injection flow channel 1612, so that the second straight section 16112 can have sufficient glue material, ensuring the stability of glue supply to the glue injection flow channel 1612 and improving the injection molding quality.

[0039] Please refer to Figure 4 and Figure 5 In this embodiment, a lower protrusion 1613 is provided on the side of the injection channel 1612 near the injection cavity 17. The lower protrusion 1613 is located inside the injection channel 1612. An upper protrusion 131 is provided on the upper mold core 13 corresponding to the lower protrusion 1613, so that the entire injection channel 1612 can have sufficient glue material, ensuring the stability of glue supply to the injection cavity 17 and improving the injection quality.

[0040] In this embodiment, the lower mold core 15 includes a mold core frame block 151 and a mold core body block 152 that is detachably disposed inside the mold core frame block 151. The side injection channel block 16 and the mold core frame block 151 are integrally formed structures with stable structures. The precision and stability of the connection between the injection channel 1612 and the injection cavity 17 are high, ensuring the stability of the side injection.

[0041] In this embodiment, a cold slug well 1614 is provided on the inner bottom surface of the buffer flow channel 1611, and the cold slug well 1614 is opposite to the output end of the casting assembly 14.

[0042] In this embodiment, the output end of the casting component 14 can be an output nozzle 141 that penetrates the upper mold core 13.

[0043] When the high-quality precision injection mold of this utility model is in operation, the injection component 14 injects glue into the gate runner 161. The curved and extended buffer runner 1611 can provide a good buffering effect on the incoming glue, reducing the impact force when the glue is injected. Then the glue is quickly and smoothly pushed in the same direction through the glue inlet runner 1612 and fills the injection cavity 17. In this way, the molded product cools and shrinks very evenly, greatly reducing the uneven stress inside the product, thereby greatly reducing the risk of warping and deformation, while avoiding spray marks and obtaining a smooth surface quality.

[0044] The high-quality precision injection mold of this preferred embodiment uses a side flow block with a buffer flow channel having a curved and extended structure to inject the material into the injection cavity. This reduces the impact force during material injection, allowing the material to flow smoothly in a laminar manner in the same direction and fill the injection cavity. The material cools and shrinks evenly, avoiding concentrated internal stress in the product and thus reducing the risk of product warping and deformation. The product has a smooth surface quality.

[0045] 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 high quality formed precision injection mold characterized by, include: Upper mold base, lower mold base, upper mold core, lower mold core, gating assembly, and side injection outlet block; The upper mold core is disposed at the bottom of the upper mold base, and the lower mold core is disposed at the top of the lower mold core. An injection cavity is formed between the lower mold core and the upper mold core. The side injection guide block is located on the side of the lower mold core near the upper mold core. The surface of the side injection guide block is provided with a sprue channel communicating with the injection cavity. The upper mold core and the side injection guide block are in surface contact to close the sprue channel. The gating assembly is disposed in the upper mold base, and the sprue channel is connected to the output end of the gating assembly. The gating system includes a buffer runner and a glue inlet runner. The buffer runner has a curved and extended structure. The glue inlet runner connects the buffer runner and the injection cavity. One end of the buffer runner away from the glue inlet runner is connected to the output end of the gating assembly. The width of the glue inlet runner gradually increases along the direction from the buffer runner to the injection cavity.

2. The high quality formed precision injection mold of claim 1, wherein, The buffer channel section is bent and extended into a U-shaped structure, and the bent and extended buffer channel section forms a first straight section, a second straight section, and a curved section connecting the first straight section and the second straight section.

3. The high quality formed precision injection mold of claim 2, wherein, The output end of the casting assembly is connected to the first straight section, and the glue inlet channel is connected to the side of the second straight section.

4. The high quality formed precision injection mold of claim 3, wherein, The flow channel length of the second straight section is greater than that of the first straight section.

5. The high quality formed precision injection mold of claim 3, wherein, The length of the glue inlet channel portion that communicates with the second straight section is less than the length of the second straight section. The end of the second straight section away from the curved section has a margin channel portion of a set length, and the margin channel portion is not connected to the glue inlet channel portion.

6. The high quality formed precision injection mold of claim 1, wherein, The depth of the buffer channel is greater than the depth of the glue inlet channel.

7. The high quality formed precision injection mold of claim 1, wherein, The injection channel portion is provided with a lower protrusion portion on the side near the injection cavity, the lower protrusion portion is located inside the injection channel portion, and the upper mold core is provided with an upper protrusion portion corresponding to the lower protrusion portion.

8. The high quality formed precision injection mold of claim 1, wherein, The lower mold core includes a mold core frame block and a detachable mold core body block disposed inside the mold core frame block. The side injection block and the mold core frame block are integrally formed.

9. The high quality formed precision injection mold of claim 1, wherein, A cold material well is provided on the inner bottom surface of the buffer flow channel, and the cold material well is opposite to the output end of the casting assembly.

10. The high quality formed precision injection mold of claim 1, wherein, The output end of the casting component is an output nozzle that penetrates the upper mold core.

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