Ultra-thick adhesive product mold

Abstract

The utility model aims at providing a kind of super-thick glue position product mould satisfying super-thick product's injection molding, which can avoid the bubble in product interior simultaneously.The utility model includes upper die and lower die, is provided with injection runner on the upper die, is provided with lower die kernel and pressure maintaining assembly on the lower die, the pressure maintaining assembly includes pressure maintaining block and the drive unit being set on the lower die, is equipped with the cavity groove compatible with the pressure maintaining block on the lower die kernel, the movable end of the drive unit is connected with the pressure maintaining block and exports pressure to the pressure maintaining block, the inner wall of the cavity groove and the top of the pressure maintaining block are cooperated to form injection molding cavity.The utility model is applied to the technical field of injection mold.

Description

Technical Field

[0001] This utility model applies to the technical field of injection molds, and particularly relates to a mold for ultra-thick glue areas. Background Technology

[0002] In the injection molding industry, different products have different injection molding thicknesses and volumes, which are usually reflected in the size of the mold cavity. The larger the space, the larger the injection molded product, and this is also reflected in the thickness. When injection molding thick rubber products, the large space often prevents the rubber from quickly filling the cavity, leading to problems such as air bubbles, shrinkage, and deformation. Therefore, to prevent these defects, a holding pressure operation is implemented during injection molding. This involves maintaining a certain output pressure in the injection runner using an inert gas such as nitrogen, and the output pressure is controlled in stages. A lower pressure is initially used to prevent premature freezing of the gate, and then the holding pressure is gradually increased to avoid internal stress imbalances and defects caused by thick rubber products. However, while this method ensures the molding effect for conventional thick rubber products, it is unavoidable for ultra-thick injection molded products, such as prototype materials for CNC machine tools. Although this holding pressure method can prevent deformation, it cannot prevent the formation of many air bubbles in the center of the product. Products with air bubbles cannot meet the requirements for prototype testing on CNC machine tools.

[0003] Therefore, there is a need for a mold that can meet the injection molding requirements of ultra-thick products while avoiding air bubbles inside the product. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a mold for ultra-thick products that can meet the injection molding requirements of ultra-thick products and avoid air bubbles inside the product.

[0005] The technical solution adopted by this utility model is as follows: This utility model includes an upper mold and a lower mold. The upper mold is provided with an injection runner. The lower mold is provided with a lower mold core and a pressure holding assembly. The pressure holding assembly includes a pressure holding block and a drive unit provided on the lower mold. The lower mold core is provided with a cavity groove adapted to the pressure holding block. The movable end of the drive unit is connected to the pressure holding block and outputs pressure to the pressure holding block. The upper mold, the inner wall of the cavity groove, and the top of the pressure holding block cooperate to form an injection molding cavity.

[0006] As can be seen from the above scheme, by cooperating with the upper mold and the cavity groove, it is possible to ensure that the product can be completely formed after the colloid is filled during the injection molding stage. Then, during the pressure holding stage, the driving unit continuously outputs pressure to the pressure holding block, so that the pressure holding block applies pressure to the bottom surface of the product simultaneously with the traditional injection molding pressure holding, thereby achieving bidirectional synchronous pressure holding. Moreover, by utilizing the large contact surface of the pressure holding block, the force it provides to the product is greater than that of the nitrogen pressure holding in the injection molding runner section, which can better reduce the generation of air bubbles in ultra-thick colloid products.

[0007] In a preferred embodiment, the length of the injection runner is greater than the thickness of the injection molding cavity formed when the upper mold and the lower mold are closed.

[0008] In a preferred embodiment, the drive unit includes a plurality of high-pressure hydraulic cylinders arranged in an array.

[0009] In a preferred embodiment, the pressure holding block is stepped, with the upper part of the pressure holding block fitting into the inner wall of the cavity groove, and a plurality of positioning springs provided between the lower part of the pressure holding block and the lower end face of the lower mold core.

[0010] A preferred embodiment is that the lower mold is provided with a plurality of guide posts that cooperate with the pressure holding block.

[0011] A preferred embodiment is that both the upper mold and the lower mold are provided with cooling pipes. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0013] Figure 2 This is an exploded structural diagram of the present invention;

[0014] Figure 3 This is a stepped sectional view of the present invention;

[0015] Figure 4 This is an exploded structural diagram of the lower mold. Detailed Implementation

[0016] like Figures 1 to 4As shown, in this embodiment, the present invention includes an upper mold 1 and a lower mold 2. The upper mold 1 is provided with an injection runner 3, and the lower mold 2 is provided with a lower mold core 21 and a pressure holding assembly. The pressure holding assembly includes a pressure holding block 22 and a drive unit provided on the lower mold 2. The lower mold core 21 is provided with a cavity groove 211 adapted to the pressure holding block 22. The movable end of the drive unit is connected to the pressure holding block 22 and outputs pressure to the pressure holding block 22. The upper mold 1, the inner wall of the cavity groove 211 and the top of the pressure holding block 22 cooperate to form an injection molding cavity. The pressure-holding block 22, together with the upper mold 1 and the cavity groove 211, forms an injection molding cavity. The top of the pressure-holding block 22 serves as the bottom surface of the injection molding cavity, allowing it to directly contact and apply pressure to the bottom surface of the product during the pressure-holding stage. This large-area contact provides greater pressure, avoiding the vacuum and air bubbles that can occur in traditional injection molds due to the faster cooling and solidification of the product's exterior compared to the interior. This prevents issues with ultra-thick plastic simulation products used for CNC machine tool prototype trial production. This invention, in conjunction with nitrogen injection pressure holding in the runner system during the pressure-holding stage, applies pressure simultaneously from both top and bottom, and the pressure is applied across the entire bottom surface, ensuring a more even distribution of pressure on the product.

[0017] like Figure 3 As shown, in this embodiment, the length of the injection runner 3 is greater than the thickness of the injection molding cavity formed when the upper mold 1 and the lower mold 2 are closed, and the channel within the injection runner 3 is conical. The injection runner 3, being longer than the injection molding cavity, allows for a larger capacity of the adhesive within its channels, preventing product collapse during the pressure holding stage. Simultaneously, the conical design, narrower at the top and wider at the bottom, prevents the adhesive from flowing back under the pressure of the pressure holding device, thereby ensuring the product's molding effect.

[0018] like Figure 3 and Figure 4As shown, in this embodiment, the driving unit includes several high-pressure hydraulic cylinders 23 arranged in an array. The pressure-holding block 22 is stepped, with its upper part adapted to the inner wall of the cavity groove 211, and several positioning springs 24 disposed between its lower part and the lower end face of the lower mold core 21. The high-pressure hydraulic cylinders 23 provide pressure, thereby creating a large and uniform pressure on the bottom surface of the product during the pressure-holding stage. The positioning springs 24 reset the pressure-holding block 22 and provide buffering force, thus preventing impact on the product when the high-pressure hydraulic cylinders 23 are activated, ensuring the molding effect of the product. The arrayed distribution of the hydraulic cylinders 23 provides uniformly distributed pressure. A driving oil circuit is provided inside the lower mold 2, and all the high-pressure hydraulic cylinders 23 are connected to the driving oil circuit, thereby achieving synchronous control of the high-pressure hydraulic cylinders and ensuring uniform force on the pressure-holding block 22.

[0019] like Figure 2 and Figure 3 As shown, in this embodiment, the lower mold 2 is provided with a plurality of guide posts 25 that cooperate with the pressure holding block 22. The provision of these guide posts 25 facilitates the positioning of the pressure holding block 22 during assembly.

[0020] In this embodiment, both the upper mold 1 and the lower mold 2 are provided with cooling pipes, which are used to cool the molds.

[0021] The working principle of this utility model:

[0022] After the upper mold 1 and the lower mold 2 are closed, the injection molding device injects adhesive into the injection molding cavity through the injection channel 3.

[0023] After injection molding is completed, on the one hand, the injection runner 3 cooperates with the nitrogen pressure holding equipment to hold pressure at the injection end of the product; on the other hand, several high-pressure cylinders 23 are started at the same time, driving the pressure holding block 22 to overcome the elastic force of several positioning springs 24 and apply uniform pressure to the bottom surface of the product. After pressure holding is completed, an ultra-thick injection molded product without bubbles is obtained.

[0024] Although the embodiments of this utility model are described with reference to actual solutions, they do not constitute a limitation on the meaning of this utility model. For those skilled in the art, modifications to the implementation schemes and combinations with other schemes based on this specification are obvious.

Claims

1. A mold for ultra-thick plastic parts, comprising an upper mold (1) and a lower mold (2), characterized in that: The upper mold (1) is provided with an injection runner (3), and the lower mold (2) is provided with a lower mold core (21) and a pressure holding assembly. The pressure holding assembly includes a pressure holding block (22) and a drive unit provided on the lower mold (2). The lower mold core (21) is provided with a cavity groove (211) that is adapted to the pressure holding block (22). The movable end of the drive unit is connected to the pressure holding block (22) and outputs pressure to the pressure holding block (22). The upper mold (1), the inner wall of the cavity groove (211) and the top of the pressure holding block (22) cooperate to form an injection molding cavity.

2. The ultra-thickness glue-filled product mold according to claim 1, characterized in that: The length of the injection runner (3) is greater than the thickness of the injection molding cavity formed when the upper mold (1) and the lower mold (2) are closed.

3. The ultra-thickness glue-filled product mold according to claim 1, characterized in that: The drive unit includes a plurality of high-pressure hydraulic cylinders (23), which are arranged in an array.

4. The ultra-thickness glue-filled product mold according to claim 1, characterized in that: The pressure holding block (22) is stepped. The upper part of the pressure holding block (22) is adapted to the inner wall of the cavity groove (211). A number of positioning springs (24) are provided between the lower part of the pressure holding block (22) and the lower end face of the lower mold core (21).

5. The ultra-thickness glue-filled product mold according to claim 1, characterized in that: The lower mold (2) is provided with a number of guide posts (25) that cooperate with the pressure holding block (22).

6. The ultra-thickness glue-filled product mold according to claim 1, characterized in that: Cooling pipes are provided inside both the upper mold (1) and the lower mold (2).

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