Cavity structure of high-precision injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to a cavity structure of a high-precision injection mold, which comprises an upper mold and a lower mold, an injection molding cavity is arranged between the upper mold and the lower mold, a core mold is arranged in the injection molding cavity, the lower mold is provided with a hole channel communicated with the injection molding cavity, and the hole channel is used for inserting the core mold into the injection molding cavity. A positioning part for determining the position of the core mold is arranged on the hole channel; an injection molding cavity used for injection molding is reserved between the upper mold and the lower mold, a core mold used for determining the shape of a product is further arranged in the injection molding cavity, and the core mold in the scheme serves as a universal part, so that in the injection molding process, only the design precision of the core mold needs to be guaranteed; under the action of the positioning part, the core mold can have enough position precision when being mounted in the injection molding cavity every time, so that the production quality of a product is ensured, the stability of the product is further improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a cavity structure of a high-precision injection mold. Background Art

[0002] An injection mold is a tool for producing plastic products and also a tool for endowing plastic products with a complete structure and precise dimensions. Injection molding is a processing method used in mass production of some complex-shaped parts. Specifically, it means injecting the heat-melted plastic into the mold cavity under high pressure by an injection molding machine, and after cooling and solidifying, a formed product is obtained.

[0003] In the prior art, in order to achieve mass production of multiple products, usually the same mold and different general mold heads are made according to some commonalities and differences of these products for injection molding production. However, due to errors in replacing general parts, it is difficult to ensure the accuracy of the injection mold after assembly, which also results in a decrease in the product qualification rate, greatly increasing the cost. Therefore, this application provides a cavity structure of a high-precision injection mold. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cavity structure of a high-precision injection mold, which solves the problem of injection accuracy between general mold heads.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A cavity structure of a high-precision injection mold, including an upper mold and a lower mold. There is an injection cavity between the upper mold and the lower mold. A core mold is arranged in the injection cavity. The lower mold has a hole communicating with the injection cavity, and the hole is used for the core mold to be inserted into the injection cavity. A positioning part for determining the position of the core mold is arranged on the hole.

[0006] By adopting the above technical solution: There is an injection cavity for injection between the upper mold and the lower mold, and there is also a core mold for determining the shape of the product in the injection cavity. In this solution, the core mold is a general part. Therefore, during the injection process, only the design accuracy of the core mold needs to be ensured. After using or replacing the core mold, the core mold can achieve sufficient position accuracy each time it is installed in the injection cavity under the action of the positioning part, ensuring the production quality of the product, further increasing the product stability, and reducing the production cost.

[0007] Wherein, the core mold is an external thread mold head, and there is a sealed coupling connection between the bottom of the external thread mold head and the hole.

[0008] By adopting the above technical solution: The core mold in this embodiment adopts an external thread mold head, which is convenient for making products with internal threads. In addition, a sealed coupling is adopted between the external thread mold head and the hole to improve the injection accuracy of the product.

[0009] A tapered hole is formed at one end of the hole channel away from the injection cavity. A tapered head is fitted and installed in the tapered hole as a positioning part. The core mold is fixedly connected to the tip end face of the tapered head. When the tapered head fits against the inner wall of the tapered hole, the tip end face of the tapered head is flush with the bottom wall of the injection cavity, and there is a sealed contact between the tip of the tapered head and the inner wall of the hole channel.

[0010] By adopting the above technical solution: In this embodiment, the positioning part uses a tapered head. The cooperation between the tapered hole and the tapered head has a very high positioning accuracy. At the same time, the cooperation between the tapered hole and the tapered head also provides guidance for the core mold, ensuring extremely high smoothness and positioning accuracy during the installation process of the core mold. In order to ensure the adaptability between the tapered head and the injection cavity, the tip end face of the tapered head is flush with the bottom wall of the injection cavity and there is a sealed contact between the tip of the tapered head and the inner wall of the hole channel, thereby further improving the injection accuracy of the product.

[0011] The upper mold is provided with an injection channel communicating with the inside of the injection cavity, and the lower mold is provided with a sunken channel corresponding to and communicating with the injection channel. The connection between the injection channel and the injection cavity is an injection hole, and one end of the injection channel close to the injection hole contracts inward.

[0012] By adopting the above technical solution: When the upper mold and the lower mold are buckled, the injection channel is communicated with the sunken channel. The injection liquid passes through the sunken channel, then to the injection channel, and then enters the injection cavity at the injection hole of the upper mold, avoiding direct contact between the injection pipeline and the injection cavity and reducing the injection quality; setting the injection hole on the upper mold avoids the situation where the injection liquid cannot fill the entire injection cavity due to gravity when the injection hole is opened on the lower mold, reducing the product quality; and the injection channel becomes narrower when approaching the injection hole, which can change the position where the flash is subjected to the maximum shear force, thereby reducing the impact of the flash on the product.

[0013] One end of the injection channel close to the injection hole is approximately tangent to the plane where the injection hole is located.

[0014] By adopting the above technical solution: Making one end of the injection channel approximately tangent to the plane where the injection hole is located. After injection molding, there will be a position where the shear force on the flash is approximately the largest and this position is closer to the injection cavity, which is conducive to trimming the flash on the product and reducing the size of the flash, further improving the product quality.

[0015] The injection channel is located on the side of the upper mold, and the sunken channel is located on one side of the part of the lower mold where the injection cavity is located.

[0016] By adopting the above technical solution: In this embodiment, both the injection channel and the sunken channel are located on one side of the injection cavity, and the sunken channel does not intersect with the injection cavity, ensuring the injection effect.

[0017] It further includes a screw lifting mechanism, and one end of the screw lifting mechanism is power-connected to the outer end of the external thread die head.

[0018] By adopting the above technical solution: The spiral lifting mechanism is used in combination with the external thread die head. On the one hand, it is convenient to insert the external thread die head into the injection cavity. On the other hand, through the spiral movement of the spiral lifting mechanism itself, it is convenient for the product to be demolded.

[0019] The technical effects and advantages of the present utility model:

[0020] 1. In this solution, there is an injection cavity for injection molding between the upper mold and the lower mold, and there is also a core mold for determining the shape of the product in the injection cavity. The core mold is a general part in this solution. Therefore, during the injection molding process, only the design accuracy of the core mold needs to be ensured. After using or replacing the core mold, the core mold can achieve sufficient position accuracy every time it is installed in the injection cavity under the action of the positioning part, ensuring the production quality of the product, further increasing the product stability, and reducing the production cost.

[0021] 2. In this solution, the core mold adopts an external thread die head, which is convenient for manufacturing products with internal threads. In addition, a sealed coupling is used between the external thread die head and the hole channel to improve the injection accuracy of the product.

[0022] 3. In this solution, the positioning part adopts a tapered head. The tapered hole and the tapered head are matched with high positioning accuracy. At the same time, the cooperation between the tapered hole and the tapered head also provides guidance for the core mold, ensuring extremely high smoothness and positioning accuracy during the installation of the core mold. In order to ensure the adaptability of the tapered head to the injection cavity, the tip end face of the tapered head is flush with the bottom wall of the injection cavity and the tip of the tapered head is in sealed contact with the inner wall of the hole channel, thereby further improving the injection accuracy of the product. Description of the Drawings

[0023] Figure 1 It is a three-dimensional view of the cavity structure of the high-precision injection mold provided by the present utility model;

[0024] Figure 2 It is a partial cross-sectional view of the cavity structure of the high-precision injection mold provided by the present utility model;

[0025] Figure 3 is Figure 2 The enlarged structural schematic diagram at position A in

[0026] Reference numerals: 1, upper mold; 2, lower mold; 3, tapered head; 4, external thread die head; 5, injection cavity; 6, injection hole; 7, injection channel; 8, sinking channel; 9, hole channel. Detailed Embodiment

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0028] Embodiment

[0029] This embodiment provides a cavity structure of a high-precision injection mold as shown in Figure 1 and Figure 2 . The cavity structure includes an upper mold 1 and a lower mold 2. An injection cavity 5 is provided between the upper mold 1 and the lower mold 2. A core mold is arranged in the injection cavity 5. The lower mold 2 has a hole 9 communicating with the injection cavity 5. The hole 9 is used for the core mold to be inserted into the injection cavity 5. A positioning portion for determining the position of the core mold is provided on the hole 9.

[0030] Furthermore, as shown in Figure 3 , an injection cavity 5 for injection is left between the upper mold 1 and the lower mold 2. There is also a core mold for determining the shape of the product in the injection cavity 5. In this solution, the core mold is a general part. Therefore, during the injection process, only the design accuracy of the core mold needs to be ensured. After using or replacing the core mold, the core mold can achieve sufficient position accuracy every time it is installed in the injection cavity 5 under the action of the positioning portion, ensuring the production quality of the product, further increasing the product stability, and reducing the production cost.

[0031] In this embodiment, the core mold is an external thread die head 4, and there is a sealed coupling connection between the bottom of the external thread die head 4 and the hole 9. The core mold of this embodiment adopts the external thread die head 4, which is convenient for manufacturing products with internal threads. In addition, the sealed coupling between the external thread die head 4 and the hole 9 is used to improve the injection accuracy of the product.

[0032] Specifically, a tapered hole is opened at one end of the hole 9 away from the injection cavity 5. A tapered head 3 is adaptively installed in the tapered hole as the positioning portion. The core mold is fixedly connected to the tip end face of the tapered head 3. When the tapered head 3 fits against the inner wall of the tapered hole, the tip end face of the tapered head 3 is flush with the bottom wall of the injection cavity 5 and there is a sealed contact between the tip of the tapered head 3 and the inner wall of the hole 9.

[0033] The positioning portion of this embodiment adopts the tapered head 3. The cooperation between the tapered hole and the tapered head 3 has a very high positioning accuracy. At the same time, the cooperation between the tapered hole and the tapered head 3 also provides guidance for the core mold, ensuring extremely high smoothness and positioning accuracy during the installation process of the core mold. In order to ensure the adaptability of the tapered head 3 to the injection cavity 5, the tip end face of the tapered head 3 is flush with the bottom wall of the injection cavity 5 and there is a sealed contact between the tip of the tapered head 3 and the inner wall of the hole 9, thereby further improving the injection accuracy of the product.

[0034] As shown inFigure 2 As shown in the figure, the upper mold 1 is provided with an injection channel 7 communicating with the inside of the injection cavity 5, and the lower mold 2 is provided with a sunken channel 8 corresponding to and communicating with the injection channel 7. The connection between the injection channel 7 and the injection cavity 5 is an injection hole 6, and one end of the injection channel 7 close to the injection hole 6 contracts inward.

[0035] When the upper mold 1 and the lower mold 2 are buckled, the injection channel 7 communicates with the sunken channel 8. The injection liquid passes through the sunken channel 8 to the injection channel 7 and then enters the injection cavity 5 at the injection hole 6 of the upper mold 1, avoiding the direct contact between the injection pipeline and the injection cavity 5 and reducing the injection quality; setting the injection hole 6 on the upper mold 1 can avoid the situation that the injection liquid cannot fill the entire injection cavity 5 due to gravity when the injection hole 6 is opened on the lower mold 2, reducing the product quality; and the injection channel 7 becomes narrower when approaching the injection hole 6, which can change the position where the flash is subjected to the maximum shear force, thereby reducing the influence of the flash on the product.

[0036] To ensure the product quality, in this embodiment, one end of the injection channel 7 close to the injection hole 6 is approximately tangent to the plane where the injection hole 6 is located. Specifically, one end of the injection channel 7 is approximately tangent to the plane where the injection hole 6 is located. After injection molding, a position where the shear force on the flash is approximately the largest will be generated on the flash and this position is closer to the injection cavity 5, which is beneficial to the trimming of the flash on the product and reducing the size of the flash, further improving the product quality.

[0037] Another example Figure 1 As shown in the figure, this embodiment also clearly shows that the injection channel 7 is located on the side of the upper mold 1, and the sunken channel 8 is located on one side of the part of the lower mold 2 where the injection cavity 5 is located. Since both the injection channel 7 and the sunken channel 8 of this embodiment are located on one side of the injection cavity 5 and the sunken channel 8 does not intersect with the injection cavity 5, the injection effect is ensured.

[0038] In order to facilitate demolding, a screw lifting mechanism is adopted, and one end of the screw lifting mechanism is power-connected to the outer end of the external thread die head 4. The screw lifting mechanism and the external thread die head 4 are used in cooperation. On the one hand, it is convenient to insert the external thread die head 4 into the injection cavity 5, and on the other hand, through the screw movement of the screw lifting mechanism itself, it is convenient for the product to be demolded. The screw lifting mechanism of this embodiment can adopt a screw lifter, and one end of the screw lifter is fixedly connected to the tapered head 3.

[0039] Finally, it should be noted that: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cavity structure of a high-precision injection mold, comprising an upper mold (1) and a lower mold (2), an injection cavity (5) is provided between the upper mold (1) and the lower mold (2), a core mold is provided in the injection cavity (5), and the characteristics are: The lower mold (2) has a channel (9) connected to the injection cavity (5), and the channel (9) is used for inserting the core mold into the injection cavity (5). The channel (9) is provided with a positioning portion for determining the position of the core mold.

2. The cavity structure of a high-precision injection mold according to claim 1, characterized in that: The core mold is an external thread die head (4), and the bottom of the external thread die head (4) is sealed and coupled with the channel (9).

3. A cavity structure of a high-precision injection mold according to claim 1 or 2, characterized in that: A conical hole is provided at one end of the channel (9) away from the injection cavity (5) as a positioning portion, a conical head (3) is fitted in the conical hole, and the core mold is fixedly connected to the tip end face of the conical head (3). When the conical head (3) is in contact with the inner wall of the conical hole, the tip end face of the conical head (3) is flush with the bottom wall of the injection cavity (5) and the tip of the conical head (3) is in sealed contact with the inner wall of the channel (9).

4. The cavity structure of a high-precision injection mold according to claim 2, characterized in that: The upper mold (1) is provided with an injection channel (7) connected to the inside of the injection cavity (5), and the lower mold (2) is provided with a sinking channel (8) correspondingly connected to the injection channel (7). The connection point between the injection channel (7) and the injection cavity (5) is an injection hole (6), and one end of the injection channel (7) close to the injection hole (6) is contracted inwardly.

5. The cavity structure of a high-precision injection mold according to claim 4, characterized in that: One end of the injection channel (7) close to the injection hole (6) is approximately tangent to the plane where the injection hole (6) is located.

6. The cavity structure of a high-precision injection mold according to claim 4, characterized in that: The injection channel (7) is located on the side of the upper mold (1), and the sinking channel (8) is located on one side of the injection cavity (5) part of the lower mold (2).

7. A cavity structure of a high-precision injection mold as claimed in claim 2 or 4, characterized in that: It also comprises a spiral lifting mechanism, one end of which is dynamically connected to the outer end of the external thread die head (4).

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