Mold runner structure

Abstract

The utility model relates to the technical field of injection molds, in particular to a mold runner structure which comprises a mold core assembly and a mold core assembly, and the mold core assembly is provided with a front mold core and a rear mold core; the injection mold further comprises a front mold insert, a front mold plate and a stripper plate, a transverse sub-runner is arranged in the front mold plate, a vertical sub-runner is arranged in the front mold insert, one end of the vertical sub-runner extends into the injection molding cavity, and the other end of the vertical sub-runner is communicated with the transverse sub-runner; a first groove is formed in the side, facing the injection molding cavity, of the water gap plate, a first insert is embedded in the first groove, one end of the first insert is fixedly connected to the water gap plate, the other end of the first insert extends into the front mold plate by a certain length, and the sprue assembly sequentially penetrates through the water gap plate and the first insert to be communicated with the transverse sub-runner. In conclusion, the length of the nozzle is shortened through the embedded insert, and plastic melt waste is reduced by more than 25%; and the third groove additional plate design improves the universality of the runner system, the forming efficiency is comprehensively improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molds, and in particular to a mold runner structure. Background Technology

[0002] In the field of injection molding, for the production of thin-walled shell products such as charger housings, a three-plate mold structure combined with a submarine gate is often used to achieve automated production. The submarine gate, through a specific mold structure, automatically breaks the runner of the molten plastic within the cavity, avoiding manual gate trimming and significantly improving production efficiency. However, the existing technology has the following technical problems:

[0003] 1. Submersible mold entry leads to excessively long gates. When using a submersible mold entry method, the vertical runner needs to penetrate the entire front mold plate (usually 35 mm thick), resulting in a gate length of ≥30 mm. Excessively long gates not only increase plastic melt waste (industry statistics show a scrap rate as high as 30%), but also prolong cooling time and reduce molding efficiency.

[0004] 2. Poor versatility of the runner system: The runner structure of existing molds is strongly correlated with the cavity size. If it is necessary to adjust the specifications of injection molded products (such as changes in the size of TYPE-C inserts), the entire front mold plate must be replaced, resulting in high mold costs and difficult maintenance.

[0005] It is evident that existing technologies tend to result in significant waste of molten plastic, increasing production costs and potentially affecting the molding time and production efficiency of the outer casing. Therefore, improvements are necessary. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] This utility model provides a mold runner structure, 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. One end of the rear mold core passes through the rear mold core and is inserted into the injection cavity. 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. A front mold plate is provided on the side of the front mold core away from the injection cavity, and a sprue plate is provided on the side of the front mold plate away from the front mold core. A transverse runner is provided inside the front mold plate. The front mold insert has a vertical runner, one end of which extends into the injection cavity for injecting molten plastic into the cavity, and the other end of which is connected to the transverse runner. The sprue plate has a first groove on the side facing the injection cavity, and a first insert is embedded in the first groove. One end of the first insert is fixed to the sprue plate, and the other end extends into the front mold plate for a certain length, so that the gate assembly passes through the sprue plate and the first insert in sequence and connects to the transverse runner, thereby allowing the molten plastic to pass through the gate assembly and be injected into the transverse runner, the vertical runner and the injection cavity in sequence.

[0008] Furthermore: a second groove is provided on the front template at the position of the first groove corresponding to the sprue plate, for accommodating the first insert and connecting to the transverse flow channel; the transverse flow channel is opened at the bottom of the second groove, and the end of the first insert facing the injection cavity is embedded in the second groove.

[0009] Furthermore, the bottom of the second groove is provided with a second through hole, and the two ends of the second through hole are respectively connected to the horizontal flow channel and the vertical flow channel.

[0010] Furthermore, the depth of the second groove is set to 16-26 mm.

[0011] Furthermore: the front mold plate has a third groove on the side facing the injection cavity, the third groove is connected to the second groove, and an additional plate is embedded in the third groove. One side of the additional plate abuts against the first insert and has a transverse flow channel; the other side of the additional plate abuts against the front mold insert and has a third through hole at the position corresponding to the vertical flow channel of the front mold insert. The third through hole connects the vertical flow channel and the transverse flow channel respectively.

[0012] Furthermore: the bottom of the first groove is provided with a first through hole, and a pull rod is provided in the first through hole. One end of the pull rod protrudes from the first through hole, thereby forming a fixed connection with the mold panel; the first insert is provided with an insert through hole corresponding to the position of the first through hole, and the other end of the pull rod extends through the insert through hole into the starting section of the vertical flow channel, which is responsible for pulling out the vertical flow channel when the mold is opened.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Cost reduction: This utility model extends the gate assembly into the front mold plate by embedding a first insert protruding 20 mm into the gate plate, effectively shortening the length of the vertical runner and reducing the gate from the usual ≥30 mm in the prior art to 20 mm, reducing plastic waste by more than 25%, and reducing the amount of plastic melt used as a whole, directly reducing production costs.

[0015] 2. Improved production efficiency: The shortened length of the vertical runner and sprue reduces the flow time and resistance of the plastic melt in the runner, which helps the plastic melt fill the injection cavity more quickly, thereby improving the molding time of the shell and increasing production efficiency.

[0016] 3. Improve mold versatility and service life: A third groove is opened on the front mold plate and an additional plate is inlaid therein. The third through hole on the additional plate is coaxially set and connected with the vertical runner of the front mold insert. When it is necessary to produce injection molded products of different models and specifications, only the additional plate corresponding to the front mold insert needs to be replaced, without replacing the entire front mold plate. This reduces production costs and improves the versatility and service life of the mold.

[0017] 4. Facilitates runner separation: A pull rod is installed in the first through hole at the bottom of the first groove. One end of the pull rod is fixedly connected to the mold panel, and the other end extends through the through hole of the insert into the starting section of the vertical runner. When the mold opens, the pull rod, through its fixed connection with the mold panel, can pull out the cooled and solidified plastic melt in the vertical runner under the action of demolding force, realizing the separation of the runner from the injection molded product, which facilitates subsequent production operations.

[0018] With the above improvements, this utility model can provide a mold runner structure that shortens the gate length by inserting inserts, reducing plastic melt waste by more than 25%; the third groove additional plate design improves the versatility of the runner system, comprehensively improves molding efficiency, and reduces production costs.

[0019] 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

[0020] 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.

[0021] Figure 1 This is a schematic diagram of the sprue plate and the first insert of this utility model;

[0022] Figure 2 This is a schematic diagram of the front template and the second groove of this utility model;

[0023] Figure 3 This is a structural schematic diagram of the front template and the additional plate of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the third groove and the additional plate of this utility model;

[0025] Figure 5 This is a structural schematic diagram of the mold core assembly and the core assembly of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the first insert and the additional plate of this utility model.

[0027] The reference numerals and names in the figure are as follows:

[0028] 10 Mold core assembly; 11 Front mold core; 12 Rear mold core; 20 Core assembly; 21 Side core; 22 Rear mold core; 30 Front mold insert; 31 Vertical runner; 40 Front template; 41 Horizontal runner; 42 Second groove; 43 Second through hole; 44 Third groove; 50 Additional plate; 51 Third through hole; 60 Sprue plate; 61 First groove; 62 First through hole; 63 Pull rod; 70 First insert; 71 Insert through hole; 80 Sprue assembly. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1 to 6In this embodiment of the present invention, a mold runner structure 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 12. The core assembly 20 has a side core 21 and a rear mold core 22. One end of the rear mold core 22 passes through the rear mold core 12 and is inserted into the injection cavity. The two sets of side cores 21 surround each other to form the side of the injection cavity. The front mold core 11 has a front mold insert 30, which forms the top surface of the injection cavity. A front mold plate 40 is provided on the side of the front mold core 11 away from the injection cavity. A sprue plate 60 is provided on the side of the front mold plate 40 away from the front mold core 11. A transverse dividing plate is provided inside the front mold plate 40. The runner 41 and the front mold insert 30 are provided with a vertical runner 31. One end of the vertical runner 31 extends into the injection cavity for injecting molten plastic into the injection cavity, and the other end is connected to the transverse runner 41. The sprue plate 60 is provided with a first groove 61 on the side facing the injection cavity. A first insert 70 is embedded in the first groove 61. One end of the first insert 70 is fixed to the sprue plate 60, and the other end extends a certain length into the front mold plate 40, so that the gate assembly 80 passes through the sprue plate 60 and the first insert 70 in sequence and connects to the transverse runner 41, so that the molten plastic passes through the gate assembly 80 and is injected into the transverse runner 41, the vertical runner 31 and the injection cavity in sequence.

[0031] Specifically, in the injection mold used for manufacturing the charger casing, a three-plate mold is typically employed. The injection method usually employs a submersible gate, where the molten plastic enters the cavity through the opening of the TYPE-C connector on the casing. The submersible gate method refers to the method where the molten plastic enters the cavity through a specific mold structure. During injection molding, the submersible gate automatically disconnects the runner, enabling fully automated production. This is highly advantageous for large-scale fully automated production. Submersible gates are divided into two main categories: pre-submersible gate and post-submersible gate. If a pre-submersible gate is used, the vertical runner 31 needs to pass through the entire front platen 40, resulting in an excessively long gate (i.e., the end runner of the gating system), wasting molten plastic.

[0032] Therefore, this invention extends the gate assembly 80 into the front mold plate 40 by embedding a first insert 70 protruding 20 mm onto the gate plate 60, thereby shortening the length of the vertical runner 31 and avoiding excessively long gates that waste molten plastic. This reduces costs and improves the molding time of the outer shell. In the prior art, the entry of water into the submersible mold results in excessively long gates (typically ≥30 mm). This invention shortens the gate to 20 mm using an embedded insert, reducing plastic waste by more than 25%. Overall, this shortens the runner, reduces costs, and improves production efficiency.

[0033] Secondly, the vertical flow channel 31 is preferably conical in shape with a taper of 1:5 to 1:10, which facilitates the uniform filling of the injection molding cavity by the molten plastic. One end of the first insert 70 is fixed to the sprue plate 60 by bolts, and the other end extends 20 mm into the front template 40.

[0034] like Figure 1 and Figure 2 As shown, preferably, the front template 40 is provided with a second groove 42 at the position of the first groove 61 corresponding to the sprue plate 60, for accommodating the first insert 70 and connecting to the transverse flow channel 41; the transverse flow channel 41 is opened at the bottom of the second groove 42, and the end of the first insert 70 facing the injection cavity is embedded in the second groove 42.

[0035] Specifically, in order to avoid the waste of plastic melt due to excessively long gates, it is preferable to provide a second groove 42 on the front template 40 and embed the first insert 70 into the second groove 42, so that the gate assembly 80 that passes through the first insert 70 can directly communicate with the transverse runner 41 at the bottom of the second groove 42, thereby reducing the length of the vertical runner 31.

[0036] like Figure 2 As shown, preferably, the bottom of the second groove 42 is provided with a second through hole 43, and the two ends of the second through hole 43 are respectively connected to the horizontal diversion channel 41 and the vertical diversion channel 31.

[0037] Specifically, in order for the plastic melt to flow smoothly from the transverse flow channel 41 into the vertical flow channel 31, a second through hole 43 needs to be provided at the bottom of the second groove 42. The second through hole 43 is located at the bottom of the transverse flow channel 41 and passes through the front template 40 to form a communication with the vertical flow channel 31 in the front mold insert 30.

[0038] like Figure 1 and Figure 2 As shown, preferably, the depth of the second groove 42 is set to 16~26 mm.

[0039] Specifically, since the thickness of the part of the front template 40 corresponding to the front mold insert 30 is 35 mm, when setting the first insert 70, it is necessary to consider both minimizing the length of the sprue and the structural strength of the front template 40 itself. Therefore, the depth of the second groove 42 is 16-26 mm, which needs to meet the structural strength requirements of the front template 40 thickness (35 mm) and ensure that the first insert 70 does not affect the overall stability of the mold after being embedded. Preferably, it is set to 20 mm.

[0040] In another embodiment, such as Figures 3 to 6As shown, preferably, to further optimize the mold structure and improve its versatility and service life, the front mold plate 40 is provided with a third groove 44 on the side facing the injection cavity. The third groove 44 is connected to the second groove 42, and an auxiliary plate 50 is embedded in the third groove 44. One side of the auxiliary plate 50 abuts against the first insert 70 and is provided with a transverse flow channel 41. The other side of the auxiliary plate 50 abuts against the front mold insert 30 and is provided with a third through hole 51 at the position corresponding to the vertical flow channel 31 of the front mold insert 30. The third through hole 51 connects the vertical flow channel 31 and the transverse flow channel 41 respectively.

[0041] Specifically, to improve the service life of the front mold plate 40 and enable the entire injection mold to produce injection molded products of various models and specifications, preferably, a third groove 44 can be formed on the front mold plate 40, and an auxiliary plate 50 can be set in the third groove 44. The third through hole 51 on the auxiliary plate 50 can be connected to the vertical runner 31 of the front mold insert 30, that is, the third through hole 51 and the vertical runner 31 are coaxially arranged and connected to each other. With this arrangement, when the specifications of the injection molded products are changed, only the auxiliary plate 50 corresponding to the front mold insert 30 needs to be replaced, without replacing the entire front mold plate 40, thereby reducing production costs.

[0042] like Figures 3 to 5 As shown, preferably, the bottom of the first groove 61 is provided with a first through hole 62, and a pull rod 63 is provided in the first through hole 62. One end of the pull rod 63 protrudes out of the first through hole 62, thereby forming a fixed connection with the mold panel; the first insert 70 is provided with an insert through hole 71 corresponding to the position of the first through hole 62, and the other end of the pull rod 63 extends through the insert through hole 71 into the starting section of the vertical flow channel 31, which is responsible for pulling out the vertical flow channel 31 when the mold is opened.

[0043] Specifically, the pull rod 63 protrudes 2-5 mm to ensure reliable fixation with the mold panel. The first through hole 62, the insert through hole 71, and the vertical runner 31 are all coaxially arranged, facilitating the pull rod 63 to pull out the vertical runner 31 during mold opening. It can be understood that each vertical runner 31 is correspondingly provided with an insert through hole 71 and a first through hole 62, and a corresponding pull rod, allowing all vertical runners 31 to be pulled out.

[0044] Secondly, the first through hole 62, the insert through hole 71 and the vertical runner 31 are all coaxially arranged. When the mold is opened, the pull rod 63, through its fixed connection with the mold panel, pulls out the cooled and solidified plastic melt in the vertical runner 31 under the action of demolding force, thereby realizing the separation of the runner from the injection molded product.

[0045] 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 runner structure, characterized by, The mold assembly includes a mold core assembly (10) and a core assembly (20) that enclose each other to form an injection cavity. The mold core assembly (10) has a front mold core (11) and a rear mold core (12). The core assembly (20) has a side core (21) and a rear mold core (22). One end of the rear mold core (22) passes through the rear mold core (12) and is inserted into the injection cavity. The two sets of side cores (21) enclose each other to form the side of the injection cavity. The front mold core (11) has a front mold insert (30) that forms the top surface of the injection cavity. The front mold core (11) has a front mold plate (40) on the side away from the injection cavity. The front mold plate (40) has a sprue plate (60) on the side away from the front mold core (11). The front mold plate (40) has a transverse runner (41). The insert (30) is provided with a vertical runner (31). One end of the vertical runner (31) extends into the injection cavity for injecting plastic melt into the injection cavity, and the other end is connected to the horizontal runner (41). The sprue plate (60) is provided with a first groove (61) on the side facing the injection cavity. A first insert (70) is embedded in the first groove (61). One end of the first insert (70) is fixed to the sprue plate (60), and the other end extends a certain length into the front template (40), so that the gate assembly (80) passes through the sprue plate (60) and the first insert (70) in sequence and is connected to the horizontal runner (41), so that the plastic melt passes through the gate assembly (80) and is injected into the horizontal runner (41), the vertical runner (31) and the injection cavity in sequence.

2. A mold runner structure according to claim 1, wherein The front template (40) is provided with a second groove (42) at the position of the first groove (61) corresponding to the sprue plate (60), which is used to accommodate the first insert (70) and connect to the transverse flow channel (41); the transverse flow channel (41) is opened at the bottom of the second groove (42), and the end of the first insert (70) facing the injection cavity is embedded in the second groove (42).

3. A mold runner structure according to claim 2, wherein The bottom of the second groove (42) is provided with a second through hole (43), and the two ends of the second through hole (43) are respectively connected to the horizontal branch channel (41) and the vertical branch channel (31).

4. The mold runner structure of claim 2, wherein The depth of the second groove (42) is set to 16~26 mm.

5. The mold runner structure of claim 2, wherein The front template (40) has a third groove (44) on the side facing the injection cavity. The third groove (44) is connected to the second groove (42). An additional plate (50) is embedded in the third groove (44). One side of the additional plate (50) abuts against the first insert (70) and has a transverse flow channel (41). The other side of the additional plate (50) abuts against the front mold insert (30) and has a third through hole (51) at the part corresponding to the vertical flow channel (31) of the front mold insert (30). The third through hole (51) connects the vertical flow channel (31) and the transverse flow channel (41) respectively.

6. The mold runner structure of claim 1 wherein, The bottom of the first groove (61) is provided with a first through hole (62), and a pull rod (63) is provided in the first through hole (62). One end of the pull rod (63) protrudes out of the first through hole (62) and thus forms a fixed connection with the mold panel. The first insert (70) is provided with an insert through hole (71) corresponding to the position of the first through hole (62). The other end of the pull rod (63) extends through the insert through hole (71) into the starting section of the vertical flow channel (31) and is responsible for pulling out the vertical flow channel (31) when the mold is opened.

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