Injection molds that can solve the problem of air bubbles at the gate

Abstract

This utility model discloses an injection mold that can solve the problem of air bubbles at the gate, including a front mold assembly, a rear mold assembly, and a gate assembly. The front mold assembly includes a front mold core with a front mold cooling water channel structure, and the front mold cooling water channel structure has a gate cooling water well. The rear mold assembly includes a rear mold core. The gate assembly includes a gate hot runner. The molding part of the front mold core and the molding part of the rear mold core are engaged to form a molding cavity. The gate hot runner is installed on the rear mold core, and the gate opening of the gate hot runner is connected to the molding cavity. The gate cooling water well located in the front mold core extends towards the molding cavity but is not connected to the molding cavity, and the gate cooling water well is opposite to the gate opening of the gate hot runner. In this way, the distance between the gate cooling water well and the gate hot runner can be shortened at the same time, and the water flow rate and velocity can be increased, thereby accelerating the cooling efficiency at the gate and avoiding air bubbles at the gate of the product, thus improving the production quality of the product.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to an injection mold that can solve the problem of air bubbles at the injection gate. Background Technology

[0002] In the injection molding process, inverted molds are widely used to meet the complex product requirements such as deep cavities and multiple gates. However, they suffer from molding defects such as air bubbles at the gate, which are among the most common production defects in injection molding. Although existing inverted molds have water cooling structures around the hot runner, the distance between the water system and the hot runner gate is relatively large, and the cooling efficiency is insufficient. This results in uneven temperature in the gate area, causing significant differences in the cooling rate of the molten plastic, which easily leads to air bubbles such as fog-like patterns and flow lines on the product surface.

[0003] To address these issues, process parameters are typically adjusted during production, such as increasing barrel temperature to optimize plastic flow, extending injection time, or reducing filling speed to minimize gas entrapment. However, these measures have limited effectiveness and cannot adequately solve the gas mark problem, while also reducing production efficiency.

[0004] In view of the above, an injection mold that can solve the problem of air bubbles at the gate is proposed, thereby improving the product quality. Utility Model Content

[0005] The purpose of this invention is to overcome at least one deficiency in the prior art and provide an injection mold that can solve the problem of air bubbles at the gate, thereby improving the production quality of the product.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] An injection mold capable of solving the problem of poor airflow at the gate includes: a front mold assembly, a rear mold assembly, and a gate assembly. The front mold assembly includes a front mold core, and a front mold cooling water structure is provided inside the front mold core, with a gate cooling water well provided on the front mold cooling water structure. The rear mold assembly includes a rear mold core. The gate assembly includes a gate hot runner. The molding portion of the front mold core and the molding portion of the rear mold core are engaged to form a molding cavity. The gate hot runner is installed on the rear mold core, and the gate inlet of the gate hot runner communicates with the molding cavity. The gate cooling water well located inside the front mold core extends towards the molding cavity but does not communicate with the molding cavity, and the gate cooling water well is disposed opposite to the gate inlet of the gate hot runner.

[0008] In one embodiment, the front mold cooling water channel further includes a water channel that passes through the interior of the front mold core and communicates with the inlet cooling water well.

[0009] In one embodiment, the inlet cooling water well has a cylindrical structure.

[0010] In one embodiment, the diameter of the inlet cooling water well is larger than the diameter of the water transport channel.

[0011] In one embodiment, multiple hot nozzles for glue inlet are provided, and multiple cooling water wells for glue inlet are also provided, with each cooling water well for glue inlet being disposed opposite to the hot nozzle for glue inlet.

[0012] In one embodiment, the front mold assembly further includes a front mold frame, on which the front mold core is mounted.

[0013] In one embodiment, the rear mold assembly further includes a rear mold frame, on which the rear mold core is mounted.

[0014] In one embodiment, the molding cavity is provided in two parts.

[0015] In one embodiment, a lateral molding member is further included, the lateral molding member being located between the front mold assembly and the rear mold assembly, the lateral molding member having a lateral molding portion for molding the side structure of the product.

[0016] In one embodiment, a demolding push structure is further included, the demolding push structure being located on the rear mold assembly, and the push end of the demolding push structure extending to the molding cavity, the demolding push structure being used to eject the product from the molding cavity and demold it.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] This invention relates to an injection mold that solves the problem of air bubbles at the injection gate. It utilizes a front mold cooling water system with an injection gate cooling water well on the front mold core. This well aligns with the injection gate of the hot-swappable nozzle, extending towards the molding cavity but not connecting to it. This allows for precise cooling of the injection gate area while shortening the distance between the well and the nozzle, thus increasing the cooling speed. Furthermore, the large water capacity of the injection gate cooling water well, combined with increased flow rate and velocity, further accelerates cooling at the injection gate, preventing air bubbles and improving product quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0020] Figure 1 This is a schematic diagram of the structure of an injection mold that can solve the problem of air bubbles at the gate in one embodiment of the present invention.

[0021] Figure 2 This is a cross-sectional structural schematic diagram of an injection mold that can solve the problem of air bubbles at the injection gate in one embodiment of the present invention.

[0022] Figure 3 for Figure 2 A cross-sectional view of the front mold core, rear mold core, sprue cooling water well, and sprue hot nozzle.

[0023] Figure 4 This is a schematic diagram of the cooling water system of the exposed front mold of the injection mold, which can solve the problem of poor air leakage at the injection gate in one embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of the injection mold's inlet cooling water well and inlet hot nozzle, which can solve the problem of poor air leakage at the inlet in an embodiment of the present invention. Detailed Implementation

[0025] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0026] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an injection mold 10 capable of solving the problem of poor airflow at the injection gate includes: a front mold assembly 100, a rear mold assembly 200, and an injection gate assembly 300. The front mold assembly 100 includes a front mold core 110, a front mold cooling water structure 120 is provided inside the front mold core 110, and an injection gate cooling water well 121 is provided on the front mold cooling water structure 120. The rear mold assembly 200 includes a rear mold core 210. The injection gate assembly 300 includes an injection nozzle 310. The molding part of the front mold core 110 and the molding part of the rear mold core 210 are engaged to form a molding cavity. The injection nozzle 310 is installed on the rear mold core 210, and the injection port of the injection nozzle 310 is connected to the molding cavity. The injection gate cooling water well 121 located inside the front mold core 110 extends towards the molding cavity but is not connected to the molding cavity, and the injection gate cooling water well 121 is arranged opposite to the injection port of the injection nozzle 310.

[0027] It should be noted that, for example, traditional inverted injection molds have a rear mold cooling channel around the hot nozzle 310. However, the distance between the cooling channel and the gate area of ​​the hot nozzle 310 is relatively far. The distance between the front mold cooling channel and the gate of the hot nozzle is also relatively far. This makes it impossible to cool the gate area in a timely and sufficient manner, resulting in problems such as insufficient cooling and uneven temperature. Consequently, the product 20 may have air bubbles in the gate area. Therefore, in this utility model, by setting a front mold cooling water transport structure 120 with a sprue cooling water well 121 on the front mold core 110, and setting the sprue cooling water well 121 opposite to the sprue hot nozzle 310, and setting the sprue cooling water well 121 to extend towards the molding cavity, which is equivalent to extending the sprue cooling water well 121 towards the sprue inlet of the sprue hot nozzle 310, the product sprue inlet corresponding to the sprue hot nozzle 310 is precisely cooled, and the distance between the water transport structure and the sprue inlet of the sprue hot nozzle 310 is shortened, thereby accelerating the cooling speed of the sprue inlet. Furthermore, the added water well structure effectively increases the water flow rate and velocity. This means that while shortening the distance between the water supply structure and the injection nozzle 310, it also increases the water flow rate and velocity. When the injection nozzle 310 reaches a high temperature, the water well 121 on the front mold core 110 provides sufficient cooling, allowing heat energy to be transferred to the mold more quickly. This effectively accelerates the cooling speed of the product 20 and resolves the issue of air bubbles at the injection nozzle. Moreover, compared to existing methods that address air bubbles by increasing the barrel temperature and lengthening the injection time, this approach improves production efficiency and shortens the production cycle.

[0028] Furthermore, the front mold cooling water channel structure 120 also includes a water channel 122, which passes through the interior of the front mold core 110 and connects to the inlet cooling water well 121. Both the inlet and outlet ends of the water channel 122 extend to the outside of the front mold assembly 100 to facilitate the entry and exit of cooling water, thus constructing a complete cooling circulation system. The water channel 122 covers a large area of ​​the front mold core 110, further increasing the cooling speed. Simultaneously, the inlet cooling water well 121 enhances the cooling of the inlet area, thereby preventing air bubbles and other defects at the inlet of the product 20.

[0029] Preferably, the inlet cooling water well 121 has a cylindrical structure. The cylindrical shape of the inlet cooling water well 121 makes it easier to machine and reduces the difficulty of processing.

[0030] Furthermore, the diameter of the inlet cooling water well 121 is larger than the diameter of the water transport channel 122. The inlet cooling water well 121 not only has a greater depth, but its diameter is also larger than the diameter of the water transport channel 122. For example, the diameter of the inlet cooling water well 121 is more than twice the diameter of the water transport channel 122, preferably twice. By increasing the volume of the inlet cooling water well 121, the residence time of the cooling water in the inlet area can be increased, improving heat exchange and thus ensuring cooling efficiency.

[0031] Furthermore, multiple hot nozzles 310 and multiple inlet cooling water wells 121 are provided, each inlet cooling water well 121 being positioned opposite to a hot nozzle 310. For larger injection molded products 20, the time required for material filling increases. Therefore, to further improve production efficiency and quality, hot nozzles 310 are provided at multiple different locations within the same molding cavity, thereby improving production efficiency and quality. Simultaneously, each hot nozzle 310 corresponds to a separate inlet cooling water well, ensuring that each inlet location is adequately cooled.

[0032] Furthermore, the front mold assembly 100 also includes a front mold base 130, on which the front mold core 110 is mounted. Molds typically require a front mold base 130 to facilitate fixing the front mold portion of the mold to the injection molding equipment. The front mold base 130 is provided with a front template 131, which has a fixing groove, and the front mold core 110 is mounted in the fixing groove.

[0033] Similarly, the rear mold assembly 200 also includes a rear mold base 220, on which the rear mold core 210 is mounted. The rear mold base 220 also facilitates the fixing of the rear mold portion of the mold onto the injection molding equipment. A rear template 221 is provided on the rear mold base 220, and a fixing groove is formed on the rear template 221, on which the rear mold core 210 is mounted. When the front and rear molds are engaged, the molding portions of the front mold core 110 and the rear mold core 210 form the molding cavity of the product 20.

[0034] To improve production efficiency, this embodiment includes two molding cavities. These two cavities are symmetrically distributed and share a front mold cooling system and a rear mold injection system. Each molding cavity is equipped with a corresponding injection port cooling water well 121 to ensure consistent molding conditions for both products 20.

[0035] In one embodiment, the injection mold capable of solving the problem of poor airflow at the gate also includes a side molding component 400. The side molding component 400 is located between the front mold assembly 100 and the rear mold assembly 200. The side molding component 400 has a side molding part, which is used for molding the side structure of the product 20. That is, when there are pits, holes, or other structures on the side of the product 20, the side molding component 400 is required for auxiliary molding. The side molding component 400 participates in the formation of the molding cavity when the mold is closed, and disengages in advance when the mold is opened to avoid interfering with the demolding of the product 20. In addition, the side molding component 400 mainly includes a molding slide seat, a guide slide rail, a wear-resistant plate, etc., and the specific details can refer to existing side molding structures.

[0036] Furthermore, injection molds that can solve the problem of poor airflow at the gate also include a demolding ejector structure 500. The demolding ejector structure 500 is located on the rear mold assembly 200, and its ejector end extends into the molding cavity. The demolding ejector structure 500 is used to eject the product 20 from the molding cavity for demolding. The demolding ejector structure 500 is positioned in the rear mold assembly 200, thus creating space clearance with the cooling water well of the front mold's gate, and not interfering with the cooling function of the gate area. The demolding ejector structure 500 typically includes an ejector plate 510, ejector pins 520, a return spring, and guide pillars and bushings, etc. Specific details can be found in existing demolding ejector structures 500, which will not be elaborated upon here.

[0037] Furthermore, a front mold cooling system 140 is provided on the front mold assembly 100, and a rear mold cooling system is also provided on the rear mold assembly 200. The front mold cooling system 140 is mainly concentrated on the front mold plate 131 and the front mold core 110, and is located close to the molding cavity to quickly remove heat from the cavity. Similarly, the rear mold cooling system is also mainly concentrated on the rear mold plate 221 and the rear mold core 210, placing it close to the molding cavity. By providing cooling systems on both the front and rear molds, heat dissipation efficiency is accelerated, and heat dissipation uniformity is further improved, preventing defects such as warping and deformation of the product 20 caused by uneven mold temperature.

[0038] Furthermore, the front mold cooling water structure 120 also includes a sealing ring 123. The sealing ring 123 is installed on the water channel 122 and the inlet cooling water well 121. The sealing ring 123 is mainly concentrated in the area where the front mold core 110 connects with other components to avoid water leakage problems.

[0039] Furthermore, the injection assembly 300 also includes a manifold 320, a hot runner heating and temperature control assembly, etc. The injection molding equipment injects the molten material into the mold and distributes it to different hot runners through the manifold 320.

[0040] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An injection mold capable of solving the poor gas track of the gate, characterized in that, include: A front mold assembly, the front mold assembly including a front mold core, the front mold core being provided with a front mold cooling water channel structure, and the front mold cooling water channel structure being provided with a glue inlet cooling water well; Rear mold assembly, the rear mold assembly including a rear mold core; and A glue dispensing assembly, the glue dispensing assembly including a glue dispensing hot nozzle; The forming part of the front mold core and the forming part of the rear mold core are engaged to form a molding cavity. The hot nozzle is installed on the rear mold core, and the inlet of the hot nozzle is connected to the molding cavity. The cooling water well of the inlet located in the front mold core extends towards the molding cavity but is not connected to the molding cavity. The cooling water well of the inlet is arranged opposite to the inlet of the hot nozzle.

2. The injection mold capable of solving the gas track defect of the glue inlet according to claim 1, characterized in that, The front mold cooling water transport structure also includes a water transport channel, which passes through the interior of the front mold core and is connected to the inlet cooling water well.

3. The injection mold capable of solving the gas track defect of the glue inlet according to claim 2, characterized in that, The inlet cooling water well has a cylindrical structure.

4. The injection mold according to claim 3, which can solve the problem of air bubbles at the gate, is characterized in that, The diameter of the inlet cooling water well is larger than the diameter of the water transport channel.

5. The injection mold according to claim 4, which can solve the problem of air bubbles at the gate, is characterized in that, Multiple glue inlet hot nozzles are provided, and multiple glue inlet cooling water wells are also provided, with each glue inlet cooling water well being arranged opposite to each glue inlet hot nozzle.

6. The injection mold according to claim 1, which can solve the problem of air bubbles at the gate, is characterized in that, The front mold assembly also includes a front mold frame, on which the front mold core is mounted.

7. The injection mold according to claim 1, which can solve the problem of air bubbles at the gate, is characterized in that, The rear mold assembly also includes a rear mold frame, on which the rear mold core is mounted.

8. The injection mold according to claim 1, which can solve the problem of air bubbles at the gate, is characterized in that, The molding cavity is provided in two parts.

9. The injection mold according to any one of claims 1-8, capable of solving the problem of air bubbles at the gate, characterized in that, It also includes a lateral forming component located between the front mold assembly and the rear mold assembly, the lateral forming component having a lateral forming portion for forming the side structure of the product.

10. The injection mold according to any one of claims 1-8, capable of solving the problem of air bubbles at the gate, characterized in that, It also includes a demolding push structure, which is located on the rear mold assembly and the push end of the demolding push structure extends to the molding cavity. The demolding push structure is used to eject the product in the molding cavity and demold it.

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