Injection mold
The injection mold's latent glue injection structure and hot runner system address the challenge of uneven plastic distribution by controlling pressure and synchronizing filling, enhancing molding quality and consistency.
Patent Information
- Application Number
- CN202322866124.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-24
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing injection molding processes for micro and small products, such as keyboard keys and small housings, face challenges in ensuring uniform distribution of molten plastic across different melt channels, leading to inconsistent molding quality due to rapid solidification and simultaneous injection of multiple products of different colors or materials.
The injection mold incorporates a latent glue injection structure with a filling adjustment cavity and a primary and secondary chamber system, along with a hot runner system to control pressure loss and ensure synchronized filling, using cold and hot runners to maintain plastic fluidity and uniformity.
The solution enhances the uniformity of molten plastic distribution, ensuring synchronized filling and solidification across channels, thereby improving the overall injection molding quality and consistency of products.
Smart Images
Figure CN222135799U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of injection molding equipment, and in particular to an injection mold. Background Art
[0002] At present, when injecting micro and small products such as keyboard keys and small housings, in order to improve production efficiency, multiple products of different colors or materials are often injected simultaneously in one injection mold, and all products need to be injected at the same time.
[0003] However, since one product corresponds to a group of melt channels, during the injection molding process, it is easy for the colloid filling in different melt channels to be unevenly distributed, making it difficult to ensure that all melt cavities are filled at the same time. In addition, the solidification time of the melt plastic is extremely short, and it is easy for different products to have different molding qualities. This will result in poor product consistency and seriously affect the molding quality of the product. Utility Model Content
[0004] In order to effectively improve the injection molding quality of products, the present application provides an injection mold.
[0005] In the first aspect, the present application provides a latent glue injection structure, which adopts the following technical solution:
[0006] A latent glue injection structure comprises a glue injection flow channel and a filling adjustment cavity opened on a rear mold; the glue injection flow channels are provided in a plurality of groups and are all connected with the filling adjustment cavity; the inner diameter of the filling adjustment cavity is smaller than the inner diameter of the glue injection flow channel; the glue injection flow channel is used to be connected with the injection cavity.
[0007] By adopting the above technical solution, since the inner diameter of the filling adjustment cavity is larger than the inner diameter of the glue feed channel, the pressure loss generated by the molten plastic passing through the filling adjustment cavity is related to the size of its inner diameter and its shape, which can be used to regulate the amount of molten plastic passing through, and then enters multiple glue feed channels through the filling adjustment cavity, which can effectively improve the uniformity of glue injection, thereby helping to improve the injection molding quality.
[0008] Preferably, the filling and regulating chamber includes a primary chamber and a plurality of secondary chambers; the plurality of secondary chambers are all connected to the primary chamber;
[0009] Each group of the glue inlet flow channels corresponds to a secondary chamber one by one, and the glue inlet flow channels are communicated with the secondary chamber.
[0010] By adopting the above technical solution, the molten plastic can be intercepted twice between a filling adjustment cavity and multiple secondary chambers, which can effectively improve the synchronization of the molten plastic filling.
[0011] Preferably, the primary chamber is configured to be cylindrical and horizontally arranged.
[0012] By adopting the above technical solution, the cylindrical first-level chamber is helpful for the setting of the second-level chamber. The uniformity of the setting of the second-level chamber can be ensured by only making the second-level chamber evenly distributed along the length direction of the first-level chamber.
[0013] Preferably, the secondary chamber is located on one side of the primary chamber in the horizontal direction.
[0014] By adopting the above technical solution, on the one hand, it is convenient for the molten plastic to enter the secondary chamber from the primary chamber, and on the other hand, it is convenient for the waste materials in the primary chamber and the secondary chamber to be discharged after the product is formed.
[0015] Preferably, the inner wall of the secondary chamber is arranged in an arc surface.
[0016] By adopting the above technical solution, the flow of molten plastic can be improved and the shear heat caused by the flow can be reduced.
[0017] Preferably, a flow diversion channel is provided between the primary chamber and the secondary chamber; the flow diversion channel includes a main flow channel and two secondary flow channels, and the main flow channel and the secondary flow channels are distributed in a Y shape;
[0018] The main flow channel is communicated with the primary chamber; the secondary flow channel is communicated with the secondary chamber, and one secondary flow channel corresponds to one or more secondary chambers.
[0019] By adopting the above technical solution, the provision of the diversion channel can improve the uniformity of diversion when the molten plastic flows from the primary chamber into the secondary chamber, which helps to improve the injection molding quality.
[0020] In a second aspect, the present application provides an injection mold, which adopts the following technical solution:
[0021] An injection mold comprises a front mold and a rear mold; the front mold is provided with a hot runner;
[0022] The rear mold is provided with an intermediate flow channel connected to the hot runner; the latent glue feeding structure is provided on the rear mold; the filling adjustment cavity is connected to the intermediate flow channel;
[0023] The intermediate flow channel and the latent glue feeding structure are both configured as cold flow channels.
[0024] By adopting the above technical solutions, the hot runner can continuously heat the molten plastic to ensure the fluidity of the molten plastic. The latent injection structure set in the cold runner can enhance the flexibility of the gate, improve the accessibility of filling, and make it easier to adjust the filling balance during the flow process.
[0025] Preferably, the hot runner comprises an inner tube, an outer tube and a heating wire arranged between the inner tube and the outer tube; the hot runner is inserted on the front mold.
[0026] By adopting the above technical solution, in the hot runner, the setting of the heating wire can continuously heat the molten plastic, ensure the fluidity of the molten plastic, and prevent the molten plastic from solidifying prematurely.
[0027] In summary, the present application includes at least one of the following beneficial technical effects:
[0028] 1. The molten plastic enters the injection channel through the hot runner, the intermediate runner and the filling adjustment cavity in turn, and finally enters the cavity. In the filling adjustment cavity, the pressure loss caused by the flow of the molten plastic can be related to the size and shape of its inner diameter, which can be used to control the flow rate of the molten plastic, and then enters multiple injection channels synchronously through the filling adjustment cavity, thereby effectively improving the uniformity of injection, thereby helping to improve the quality of injection molding.
[0029] 2. The setting of the primary chamber and the secondary chamber can make the molten plastic enter each injection channel synchronously, and at the same time improve the uniformity of the molten plastic, so as to ensure that the molten plastic in different injection channels solidifies synchronously, which helps to improve the injection molding quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 It is a structural schematic diagram of the latent glue injection structure in Example 1 of the present application;
[0031] Figure 2 It is a schematic diagram of the structure of the internal flow channel arrangement of the injection mold in Example 2 of the present application;
[0032] Figure 3 is a cross-sectional view of the hot runner in Example 2 of the present application
[0033] Markings in the attached drawings: 1. Glue inlet channel; 2. Filling adjustment chamber; 21. Primary chamber; 22. Secondary chamber; 23. Diversion channel; 231. Main channel; 232. Secondary channel; 3. Hot runner; 31. Inner tube; 32. Outer tube; 33. Heating wire; 4. Intermediate channel; 5. Injection molding cavity. DETAILED DESCRIPTION
[0034] The following is combined with Figure 1-3 This application is described in further detail.
[0035] Example 1
[0036] The present application embodiment discloses a latent injection structure. Figure 1The latent injection structure includes an injection flow channel 1 and a filling adjustment cavity 2. The injection flow channel 1 is provided with a plurality of groups and all are connected with the filling adjustment cavity 2. When the latent injection structure is applied to the injection mold, the molten plastic can first enter the filling adjustment cavity 2, and then enter the injection flow channel 1 from the filling adjustment cavity 2. The injection flow channel 1 is connected with the injection cavity 5 of the injection mold, so that the molten plastic can enter the injection cavity 5 to ensure the normal progress of the injection molding work.
[0037] The filling and regulating chamber 2 includes a primary chamber 21 and two secondary chambers 22. The primary chamber 21 is arranged in a cylindrical shape and is horizontally placed. The secondary chambers 22 are located on one side of the primary chamber 21 in the horizontal direction and are evenly distributed along the length direction of the primary chamber 21. Both secondary chambers 22 are connected to the primary chamber 21. Each group of the glue feed flow channels 1 corresponds to one secondary chamber 22, and the glue feed flow channels 1 are connected to the secondary chambers 22.
[0038] Generally, the number of groups of the injection flow channels 1 is the same as the number of the injection cavities 5 on the injection mold, and the number of the filling adjustment cavities 2 is inferred from the number of the injection flow channels 1. In the embodiment of the present application, one group of the injection flow channels 1 includes four flow channels. And the ratio of the number of the filling adjustment cavities 2 to the number of the injection flow channels 1 is 2:1. For example, if the number of the injection flow channels 1 is eight groups, then the number of the filling adjustment cavities 2 is four groups.
[0039] As a preferred implementation of the embodiment of the present application, the ratio of the number of filling adjustment chambers 2 to the number of glue inlet channels 1 can also be set to 3:1, 4:1, etc.
[0040] In order to allow the molten plastic to be uniformly dispersed and injected from the primary chamber 21 into the two secondary chambers 22, a diversion channel 23 is provided between the primary chamber 21 and the secondary chamber 22. The diversion channel 23 includes a main channel 231 and two secondary channels 232, and the main channel 231 and the secondary channels 232 are distributed in a Y shape. The main channel 231 is connected to the primary chamber 21, and the diameter of the main channel 231 is smaller than the diameter of the first chamber. The secondary channel 232 is connected to the secondary chamber 22, and one secondary channel 232 corresponds to one or more secondary chambers 22, and the diameter of the secondary chamber 22 is larger than the diameter of the secondary channel 232.
[0041] The secondary chamber 22 is ellipsoidal, so the inner wall of the secondary chamber 22 is a curved surface. Multiple injection channels 1 are located above the secondary chamber 22 and are evenly distributed, so that the molten plastic can be evenly dispersed and injected into the multiple injection channels. The diameter of the injection channel 1 is smaller than the diameter of the secondary chamber 22.
[0042] The implementation principle of the latent injection structure in the embodiment of the present application is as follows: the molten plastic enters the injection channel through the primary chamber 21, the diverter channel 23, and the secondary chamber 22 in sequence. In the primary chamber 21, since the pressure required for injecting the molten plastic into the primary chamber 21 is lower than the pressure required for injecting the molten plastic into the diverter channel 23, the molten plastic will first fill the primary chamber 21 and then enter the secondary chamber 22 through the diverter channel 23.
[0043] Similarly, since the pressure required for injecting the molten plastic into the secondary chamber 22 is lower than the pressure for injecting the molten plastic into the injection flow channel 1, the molten plastic will first fill the secondary chamber 22 and then enter the injection flow channel 1. In this way, the molten plastic can enter multiple injection channels as synchronously as possible, thereby ensuring the uniformity of injection, which helps to improve the injection quality.
[0044] Example 2
[0045] The present application embodiment discloses an injection mold, referring to Figure 2 , including a front mold and a rear mold. In order to clearly show the flow channel structure in this application, the structure of the front mold and the rear mold is not shown in the accompanying drawings.
[0046] Reference Figure 2 and Figure 3 The front mold is provided with a hot runner 3; the hot runner 3 includes an inner tube 31, an outer tube 32, and a heating wire 33 arranged between the inner tube 31 and the outer tube 32. The heating wire 33 surrounds the inner tube 31 to heat the molten plastic flowing inside the inner tube 31 to ensure the fluidity of the molten plastic. The hot runner 3 is inserted in the front mold.
[0047] Reference Figure 2 The rear mold is provided with an intermediate flow channel 4 connected to the hot runner 3 , and the latent injection structure is also provided on the rear mold and connected to one side of the intermediate flow channel 4 . The filling adjustment cavity 2 is connected to the intermediate flow channel 4 .
[0048] In order to make the molten plastic in the rear mold solidify quickly, the filling adjustment cavity 2, the glue inlet runner 1 and the middle runner 4 are all in the form of cold runners.
[0049] An injection mold cavity 5 is provided between the front mold and the rear mold. A glue inlet flow channel 1 is located directly below the injection mold cavity 5 and communicated with the injection mold cavity 5.
[0050] The rear mold includes a first mold plate and a second mold plate, and the filling adjustment cavity 2 is opened between the first mold plate and the second mold plate. Therefore, when the waste material in the filling adjustment cavity 2 and the glue inlet flow channel 1 is solidified, the first mold plate and the second mold plate are separated to remove the waste material.
[0051] The implementation principle of the injection mold in the embodiment of the present application is as follows: during injection molding, the molten plastic enters the mold cavity through the hot runner 3, the intermediate runner 4, the filling adjustment cavity 2, and the glue inlet flow channel 1. In the hot runner 3, the setting of the heating wire 33 can continuously heat the molten plastic to ensure the fluidity of the molten plastic. The setting of the filling adjustment cavity 2 can make the molten plastic enter the different glue inlet flow channels 1 as evenly as possible.
[0052] After the product is formed, the front mold and the rear mold are opened to take the product out of the cavity, and the first mold plate and the second mold plate are opened at the same time to take out the waste material in the filling adjustment cavity 2 and the glue inlet flow channel 1.
[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An injection mold, Features: It comprises a front mold and a rear mold; the front mold is provided with a hot runner (3); The rear mold is provided with an intermediate flow channel (4) connected to the hot runner (3); the rear mold is provided with a latent glue feeding structure, the latent glue feeding structure comprising a glue feeding flow channel (1) and a filling adjustment cavity (2) provided on the rear mold; the glue feeding flow channel (1) is provided with a plurality of groups and all of them are connected to the filling adjustment cavity (2); the inner diameter of the filling adjustment cavity (2) is smaller than the inner diameter of the glue feeding flow channel (1); the glue feeding flow channel (1) is used to be connected to the injection molding cavity (5); The filling and regulating chamber (2) is in communication with the intermediate flow channel (4); The intermediate flow channel (4) and the latent glue feeding structure are both configured as cold flow channels.
2. The injection mold according to claim 1, Features: The hot runner (3) comprises an inner tube (31), an outer tube (32), and a heating wire (33) arranged between the inner tube (31) and the outer tube (32); the hot runner (3) is inserted into the front mold.
3. The injection mold according to claim 1, Features: The filling and regulating chamber (2) comprises a primary chamber (21) and a plurality of secondary chambers (22); the plurality of secondary chambers (22) are all in communication with the primary chamber (21); Each group of the glue inlet flow channels (1) corresponds one to one with a secondary chamber (22), and the glue inlet flow channels (1) are in communication with the secondary chamber (22).
4. The injection mold according to claim 3, Features: The primary chamber (21) is configured to be cylindrical and disposed horizontally.
5. The injection mold according to claim 3, Features: The secondary chamber (22) is located on one side of the primary chamber (21) in the horizontal direction.
6. The injection mold according to claim 3, Features: The inner wall of the secondary chamber (22) is arranged in the form of an arc surface.
7. The injection mold according to claim 3, Features: A flow diversion channel (23) is provided between the primary chamber (21) and the secondary chamber (22); the flow diversion channel (23) comprises a main flow channel (231) and two secondary flow channels (232), and the main flow channel (231) and the secondary flow channels (232) are distributed in a Y shape; The main flow channel (231) is in communication with the primary chamber (21); the secondary flow channel (232) is in communication with the secondary chamber (22), and one secondary flow channel (232) corresponds to one or more secondary chambers (22).