Mould for precise small hole injection molding

Abstract

The utility model discloses a mold for precise small hole injection molding, which comprises a fixed mold, a movable mold and a core-pulling mechanism, the fixed mold comprises a fixed mold core, the fixed mold core is provided with a fixed mold cavity and a plurality of first needle holes communicated with the fixed mold cavity, and the fixed mold cavity is arranged on one side of the fixed mold core facing the movable mold; the movable mold comprises a movable mold core, a movable mold cavity and a plurality of second needle holes communicated with the movable mold cavity are formed in the movable mold core, the movable mold cavity is formed in the side, facing the fixed mold, of the movable mold core, the movable mold cavity and the fixed mold cavity jointly form a cavity, and the second needle holes penetrate through the movable mold core; the core pulling mechanism comprises a demolding plate, a plurality of mold needles are arranged on the demolding plate, and the ends, away from the demolding plate, of the mold needles penetrate through the second needle holes and the mold cavities and are inserted into the first needle holes. A plurality of needle holes are formed in the fixed mold core and the movable mold core, and one end of a mold needle on the demolding plate penetrates through the second needle hole and the mold cavity and is inserted into the first needle hole, so that a porous plastic product can be manufactured through an injection molding process, and the processing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a mold for precision small hole injection molding. Background Art

[0002] Porous plastic products are widely used across various industries, but are particularly indispensable in the audio industry. Currently, most audio products on the market feature densely packed holes in the speaker's speaker area to facilitate sound transmission. Traditionally, CNC (center-mounted machining) multi-axis drilling technology has been used to create these densely packed holes. However, this technology presents certain technical bottlenecks, such as low efficiency, high costs, high defect rates, and significant human resource investment. Therefore, a breakthrough in processing technology for these products is essential. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a mold for precision small-hole injection molding to solve the problem of low processing efficiency of porous plastic products in the prior art.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] The utility model provides a mold for precision small hole injection molding, comprising a fixed mold, a movable mold and a core pulling mechanism which are arranged in sequence, wherein the fixed mold comprises a fixed mold core, the fixed mold core is provided with a fixed mold cavity and a plurality of first pinholes which are communicated with the fixed mold cavity, and the fixed mold cavity is arranged on a side of the fixed mold core facing the movable mold; the movable mold comprises a movable mold core, the movable mold core is provided with a movable mold cavity and a plurality of second pinholes which are communicated with the movable mold cavity, the movable mold cavity is arranged on a side of the movable mold core facing the fixed mold and forms a mold cavity together with the fixed mold cavity, and the second pinholes penetrate the movable mold core; the core pulling mechanism comprises a stripper plate, a plurality of mold pins are provided on the stripper plate, and an end of the mold pin away from the stripper plate penetrates the second pinhole and the mold cavity and is inserted into the first pinhole.

[0006] Furthermore, the mold pin is detachably connected to the stripping plate.

[0007] Furthermore, the stripping plate is provided with a plurality of mounting holes, and the mold pins are installed in the mounting holes.

[0008] Furthermore, the stripper plate includes a first stripper plate and a second stripper plate, the first stripper plate is arranged on the side of the second stripper plate facing the movable mold core, the mold pin includes a first mold pin and a second mold pin, the first mold pin is installed on the first stripper plate, and the second mold pin is installed on the second stripper plate. The first stripper plate is provided with a first avoidance hole corresponding to the second mold pin, and the second mold pin is away from the second stripper plate and passes through the first stripper plate from the first avoidance hole.

[0009] Furthermore, the stripper plate includes a third stripper plate, which is arranged on a side of the second stripper plate away from the first stripper plate, and the mold needle includes a third mold needle, which is installed on the third stripper plate. The first stripper plate and the second stripper plate are both provided with a second avoidance hole corresponding to the third mold needle, and the third mold needle is away from the third stripper plate and passes through the first stripper plate and the second stripper plate from the second avoidance hole.

[0010] Furthermore, the first needle hole passes through the fixed mold core.

[0011] Furthermore, one end of the mold pin away from the stripping plate is a conical structure or an arc-shaped structure.

[0012] Furthermore, the opening of the second pinhole toward one end of the stripping plate is a trumpet-shaped structure and becomes larger toward the stripping plate.

[0013] Furthermore, a plurality of first flow channels connected to the cavity are provided between the fixed mold core and the movable mold core, and the plurality of first flow channels are arranged around the periphery of the cavity. The mold is provided with a plurality of second flow channels on the periphery of the cavity, and the second flow channels are connected to the first flow channels.

[0014] Furthermore, the mold is provided with a plurality of heaters, and the periphery of each second flow channel is correspondingly provided with the heater.

[0015] The beneficial effects of the present invention are as follows: by arranging a plurality of pinholes on both the fixed mold core and the movable mold core, one end of the mold pin on the stripper plate passes through the second pinhole and the mold cavity and is inserted into the first pinhole, so that the mold can be used to produce porous plastic products through an injection molding process, thereby improving the processing efficiency and quality of the porous plastic products and reducing labor costs; and the first pinhole on the fixed mold core can limit the end of the mold pin, which can prevent the end of the mold pin from being offset or deformed in the mold cavity during the injection molding process, thereby further improving the processing quality of the porous plastic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the porous plastic product, flow channel and heater in the utility model;

[0017] Figure 2 This is a schematic structural diagram of the mold core in the utility model mold;

[0018] Figure 3 This is a schematic diagram of the split structure of the mold core in the mold of the utility model from a top view;

[0019] Figure 4 It is a schematic diagram of the split structure of the mold core in the mold of the utility model when viewed from above.

[0020] In the figure: fixed mold core 10, fixed mold cavity 101, first flow channel 11, first pinhole 102, movable mold core 20, movable mold cavity 201, second pinhole 202, stripper plate 30, mounting hole 301, first stripper plate 31, second stripper plate 32, third stripper plate 33, second flow channel 40, heater 50; porous plastic product 100. DETAILED DESCRIPTION

[0021] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features and effects of the mold for precision small hole injection molding proposed by the present invention as follows:

[0022] Figure 1 It is a structural schematic diagram of the porous plastic product, flow channel and heater in the utility model. Figure 2 It is a structural schematic diagram of the mold core in the mold of the utility model. Figure 3 It is a schematic diagram of the split structure of the mold core in the mold of the utility model when viewed from above. Figure 4 It is a schematic diagram of the split structure of the mold core in the mold of the utility model when viewed from above.

[0023] like Figures 1 to 4 As shown, the utility model provides a mold for precision small hole injection molding, including a fixed mold, a movable mold and a core pulling mechanism arranged in sequence, wherein the fixed mold, the movable mold and the core pulling mechanism are connected by guide pillars, and the movable mold and the core pulling mechanism can slide on the guide pillars to achieve mold closing and mold opening.

[0024] The fixed mold includes a fixed mold core 10, which is provided with a fixed mold cavity 101 and a plurality of first pinholes 102 in communication with the fixed mold cavity 101. The fixed mold cavity 101 is located on the side of the fixed mold core 10 facing the movable mold. The movable mold includes a movable mold core 20, which is provided with a movable mold cavity 201 and a plurality of second pinholes 202 in communication with the movable mold cavity 201. The movable mold cavity 201 is located on the side of the movable mold core 20 facing the fixed mold and forms a mold cavity together with the fixed mold cavity 101. The second pinholes 202 penetrate the movable mold core 20. The core pulling mechanism includes a stripper plate 30, which is provided with a plurality of mold pins (not shown). The ends of the mold pins away from the stripper plate 30 penetrate the second pinholes 202 and the mold cavity and are inserted into the first pinholes 102. The second pinholes 202 correspond one-to-one with the first pinholes 102, and the first pinholes 102 and the second pinholes 202 both correspond one-to-one with the mold pins. The shape of the cavity can be set according to the shape of the porous plastic product 100, and the number of mold pins can be set according to the number of small holes on the porous plastic product 100. For example, the number of mold pins and the number of small holes on the porous plastic product 100 are both 2869.

[0025] In the present application, a plurality of pinholes are provided on both the fixed mold core 10 and the movable mold core 20, and one end of the mold pin on the stripper plate 30 passes through the second pinhole 202 and the mold cavity and is inserted into the first pinhole 102, so that the mold can be used to produce porous plastic products through the injection molding process, thereby improving the processing efficiency and quality of the porous plastic products and reducing labor costs; since the plastic melt has a high temperature and impact force during the injection molding process, and the mold pin is relatively small, by inserting one end of the mold pin into the first pinhole 102 of the fixed mold core 10, the first pinhole 102 on the fixed mold core 10 can limit the end of the mold pin, and during the injection molding process, the end of the mold pin can be prevented from being offset or deformed in the mold cavity, further improving the processing quality of the porous plastic products.

[0026] Furthermore, the first needle hole 102 passes through the fixed mold core 10. When the mold is closed, the length of the mold pin inserted into the first needle hole 102 can be increased, and during the injection molding process, the end of the mold pin can be prevented from being offset or deformed in the mold cavity, thereby further improving the processing quality of the porous plastic product.

[0027] Optionally, the mold pin is detachably connected to the stripper plate 30 so that the mold pin can be replaced when deformed or damaged, and the mold pin can be removed during transportation to avoid damage to the mold pin during transportation.

[0028] Furthermore, the stripper plate 30 is provided with a plurality of mounting holes 301, into which the mold pins are mounted. The mounting holes 301 correspond one to one with the mold pins. The mounting holes 301 may be internally threaded, and one end of the mold pins may be externally threaded. The mold pins and the stripper plate 30 are detachably connected via the threaded structure. Of course, the mold pins and the stripper plate 30 may also be detachably connected using other methods.

[0029] Furthermore, the end of the mold pin facing away from the stripper plate 30 has a conical or arc-shaped structure, while the opening of the second needle hole 202 facing the stripper plate 30 has a trumpet-shaped structure that widens toward the stripper plate 30. This allows the mold pin to be more accurately inserted into the corresponding second needle hole 202 and first needle hole 102 during the mold closing process. The cross-sectional shape of the mold pin can be circular, hexagonal, or the like, and its cross-sectional shape is consistent with the shape of the small holes in the porous plastic product 100.

[0030] In this embodiment, the stripper plate 30 includes a first stripper plate 31 and a second stripper plate 32. The first stripper plate 31 is arranged on the side of the second stripper plate 32 facing the movable mold core 20. The mold pin includes a first mold pin and a second mold pin. The first mold pin is installed on the first stripper plate 31, and the second mold pin is installed on the second stripper plate 32. The first stripper plate 31 is provided with a first avoidance hole corresponding to the second mold pin. The second mold pin is away from the second stripper plate 32 and passes through the first stripper plate 31 from the first avoidance hole.

[0031] Furthermore, the stripper plate 30 includes a third stripper plate 33, which is located on the side of the second stripper plate 32 away from the first stripper plate 31. The mold pin includes a third mold pin, which is mounted on the third stripper plate 33. The first and second stripper plates 31 and 32 are both provided with a second avoidance hole corresponding to the third mold pin. The third mold pin passes through the first and second stripper plates 31 and 32 from the second avoidance hole away from the third stripper plate 33. One end of the first, second, and third mold pins all passes through the second needle hole 202 and the mold cavity and is inserted into the first needle hole 102. By providing a first stripper plate 31, a second stripper plate 32, and a third stripper plate 33, and respectively mounting the first, second, and third pins, the first, second, and third pins can be withdrawn from the porous plastic product 100 in batches during mold opening, reducing the pulling force on the porous plastic product 100 during pin withdrawal, thereby preventing damage to the porous plastic product 100 during the core pulling process. Of course, in other embodiments, only one stripper plate 30 may be provided, with all pins mounted on the same stripper plate 30, and the pins are simultaneously withdrawn from the porous plastic product 100 during mold opening.

[0032] Among them, the mold pin, the first needle hole 102, the second needle hole 202 and the mounting hole 301 are all precision-machined, and the design is precisely positioned to avoid the mold pin from deviating; the fixed mold core 10, the movable mold core 20 and the stripper plate 30 are all processed by high-precision wire cutting.

[0033] In this embodiment, a plurality of first flow channels 11 ( Figure 4 ), a plurality of first flow channels 11 are arranged around the periphery of the cavity, and the mold is provided with a plurality of second flow channels 40 ( Figure 1 ), the second flow channel 40 is connected to the first flow channel 11.

[0034] Furthermore, the mold is equipped with multiple heaters 50, one located around the periphery of each second flow channel 40. The heaters 50 are used to heat the second flow channel 40 to prevent the temperature of the molten plastic from dropping. The heaters 50 can be heating coils that heat the sidewalls of the second flow channel 40 using electromagnetic principles.

[0035] The specific implementation steps are as follows:

[0036] 1) The movable mold core 20 and the stripper plate 30 are closed, and the mold pin passes through the movable mold core 20 from the second needle hole 202 and is higher than the movable mold core 20;

[0037] 2) The movable mold core 20 and the stripper plate 30 move together and close to the fixed mold core 10, and the mold pin is inserted into the first pinhole 102 of the fixed mold core 10;

[0038] 3) The second flow channel 40 is injected with plastic material to fill the mold cavity;

[0039] 4) The stripper plate 30 drives the mold pin to move and separate the movable mold core 20 and the porous plastic product 100 in the mold cavity;

[0040] 5) Then, the movable mold core 20 is separated from the fixed mold core 10, and the robot removes the porous plastic product 100.

[0041] Injection molds have the following advantages over CNC processes:

[0042] 1. Improve production efficiency: The development of injection molds has the ability to produce in batches, and can also greatly improve production efficiency and yield, shorten production cycles, and reduce processing costs;

[0043] 2. Reduce labor costs: Injection mold processing can use automatic loading and unloading to replace manual loading and unloading of CNC drilling, thereby saving labor costs and providing stable production efficiency.

[0044] 3. Improve product quality: The injection molding process has a high yield rate and good stability. Compared with the CNC process, it can reduce the risk of human error and improve product consistency and reliability.

[0045] In this document, directional terms such as "up," "down," "left," "right," "front," and "back" are defined based on the positions of structures in the accompanying drawings and their relative positions to each other, for the sake of clarity and convenience in presenting the technical solution. It should be understood that the use of these directional terms does not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second," etc., used herein, are used solely for distinctions and are not intended to limit quantity or order.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A mold for precision small hole injection molding, characterized in that: The invention comprises a fixed mold, a movable mold and a core pulling mechanism which are arranged in sequence, wherein the fixed mold comprises a fixed mold core (10), the fixed mold core (10) is provided with a fixed mold cavity (101) and a plurality of first pinholes (102) which are in communication with the fixed mold cavity (101), and the fixed mold cavity (101) is arranged on a side of the fixed mold core (10) facing the movable mold; the movable mold comprises a movable mold core (20), the movable mold core (20) is provided with a movable mold cavity (201) and a plurality of first pinholes (102) which are in communication with the movable mold cavity (201). The movable mold cavity (201) is provided on the side of the movable mold core (20) facing the fixed mold and forms a mold cavity together with the fixed mold cavity (101), and the second needle holes (202) penetrate the movable mold core (20); the core pulling mechanism includes a stripper plate (30), and the stripper plate (30) is provided with a plurality of mold pins, and the ends of the mold pins away from the stripper plate (30) penetrate the second needle holes (202) and the mold cavity and are inserted into the first needle holes (102).

2. The mold for precision small hole injection molding according to claim 1, characterized in that: The mold pin is detachably connected to the stripping plate (30).

3. The mold for precision small hole injection molding according to claim 1, characterized in that: The stripping plate (30) is provided with a plurality of mounting holes (301), and the mold pins are mounted in the mounting holes (301).

4. The mold for precision small hole injection molding according to claim 1, characterized in that: The stripper plate (30) includes a first stripper plate (31) and a second stripper plate (32), wherein the first stripper plate (31) is arranged on the side of the second stripper plate (32) facing the movable mold core (20), and the mold pin includes a first mold pin and a second mold pin, wherein the first mold pin is installed on the first stripper plate (31), and the second mold pin is installed on the second stripper plate (32), and a first avoidance hole corresponding to the second mold pin is provided on the first stripper plate (31), and the second mold pin passes through the first stripper plate (31) from the first avoidance hole away from the second stripper plate (32).

5. The mold for precision small hole injection molding according to claim 4, characterized in that: The stripping plate (30) includes a third stripping plate (33), and the third stripping plate (33) is arranged on the side of the second stripping plate (32) away from the first stripping plate (31). The mold needle includes a third mold needle, and the third mold needle is installed on the third stripping plate (33). The first stripping plate (31) and the second stripping plate (32) are both provided with a second avoidance hole corresponding to the third mold needle. The third mold needle is away from the third stripping plate (33) and passes through the first stripping plate (31) and the second stripping plate (32) from the second avoidance hole.

6. The mold for precision small hole injection molding according to any one of claims 1 to 5, characterized in that: The first needle hole (102) passes through the fixed mold core (10).

7. The mold for precision small hole injection molding according to any one of claims 1 to 5, characterized in that: One end of the mold pin away from the stripping plate (30) is a conical structure or an arc-shaped structure.

8. The mold for precision small hole injection molding according to any one of claims 1 to 5, characterized in that: The opening of the second needle hole (202) toward one end of the stripping plate (30) is a trumpet-shaped structure and becomes larger toward the stripping plate (30).

9. The mold for precision small hole injection molding according to any one of claims 1 to 5, characterized in that: A plurality of first flow channels (11) communicating with the mold cavity are provided between the fixed mold core (10) and the movable mold core (20), and the plurality of first flow channels (11) are arranged around the periphery of the mold cavity. The mold is provided with a plurality of second flow channels (40) on the periphery of the mold cavity, and the second flow channels (40) are communicated with the first flow channels (11).

10. The mold for precision small hole injection molding according to claim 9, characterized in that: The mold is provided with a plurality of heaters (50), and the periphery of each second flow channel (40) is correspondingly provided with the heater (50).

Images