Mold for eliminating vacuum mold sticking by nitrogen

Abstract

The utility model discloses a mold for eliminating vacuum mold sticking by nitrogen, and aims to provide a mold for eliminating vacuum mold sticking by nitrogen, which is simple in structure, eliminates vacuum by blowing nitrogen, solves the problem of mold sticking, and keeps the appearance of a product clean and tidy. The device comprises a nitrogen-filled upper die and a lower die, the nitrogen-filled upper die comprises an upper pressing plate and an upper die plate, the upper die plate is provided with two groups of upper die cavities and a nitrogen pipeline module, the nitrogen pipeline module is arranged in the upper die plate and comprises a gas inlet pipe, a gas distributing pipe and a plurality of gas blowing pipes, and one side of the upper die plate is provided with a nitrogen connector hole. The nitrogen connector hole is matched with a gas inlet pipe, the gas inlet pipe is connected and communicated with a plurality of gas blowing pipes through gas distributing pipes, the gas blowing pipes are respectively connected and communicated with two groups of upper die cavities, the lower die comprises a lower carrier plate and a lower die plate, two groups of lower die cavities are arranged on the upper end face of the lower die plate, and the two groups of upper die cavities are matched with the two groups of lower die cavities. The injection mold is applied to the technical field of injection molds.

Description

Technical Field

[0001] The utility model is applied to the technical field of injection molds, and particularly relates to a mold for eliminating vacuum sticking by nitrogen gas. Background Art

[0002] At present, the mouse lower cover products on the market are usually made of two-color plastic injection molding. In order to ensure the user experience of consumers, the second-color material usually uses TPR. The smoother the material property, the easier it is to form a vacuum between the material and the cavity during the injection molding process of the mold, and the adsorption force is very large, resulting in serious sticking of the product to the front mold. After injection molding, there will be more defects. The existing technology mainly solves the problem by thickening the surface pattern of the front mold, making different anti-drawing patterns on the rear mold, and making undercuts around. According to products of different shapes, continuous injection molding tests are carried out to finally obtain the best surface pattern and undercuts. Although this method can solve the problem of product surface defects, due to the high-temperature environment and many mold components, it is very difficult to control the injection molding process in exactly the same environment and working conditions, resulting in unstable injection molding process. Moreover, this method cannot accurately ensure what pattern the rear mold should be polished to solve the sticking problem at one time. If it is too thick, it will cause the product to turn white at the top. If it is too fine, it cannot solve the sticking problem. It takes a lot of manpower, material resources, time, trial mold cost and maintenance cost to obtain the result through repeated practice. In addition, the surface pattern of the front mold needs to be thickened, so there are also certain differences between the appearance surface and the original design appearance, which are prone to defects. If a mold for eliminating vacuum sticking by nitrogen gas with a simple structure, which can eliminate vacuum by blowing nitrogen gas to solve sticking and keep the product appearance clean, can be designed, the above problems can be solved. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a mold for eliminating vacuum sticking by nitrogen gas with a simple structure, which can eliminate vacuum by blowing nitrogen gas to solve sticking and keep the product appearance clean.

[0004] The technical solution adopted by the utility model is as follows: The utility model includes a nitrogen gas filling upper mold and a lower mold. The nitrogen gas filling upper mold includes an upper pressure plate and an upper template. The upper template is provided with two groups of upper mold cavities and a nitrogen gas pipeline module. The nitrogen gas pipeline module is arranged inside the upper template. Two groups of the upper mold cavities are arranged on the lower end surface of the upper template. The nitrogen gas pipeline module includes an air inlet pipe, a branch pipe and a plurality of air blowing pipes. A nitrogen gas joint hole is arranged on one side of the upper template, and the nitrogen gas joint hole is matched with the air inlet pipe. The air inlet pipe is connected and communicated with the plurality of air blowing pipes through the branch pipe. The plurality of air blowing pipes are respectively connected and communicated with the two groups of upper mold cavities. The lower mold includes a lower carrier plate and a lower template. Two groups of lower mold cavities are arranged on the upper end surface of the lower template. The two groups of upper mold cavities are matched with the two groups of lower mold cavities.

[0005] Further, a plurality of positioning guide shafts are provided on the lower end surface of the upper template, and a plurality of positioning guide sleeves are provided on the upper end surface of the lower template. The plurality of positioning guide shafts are in positioning cooperation with the plurality of positioning guide sleeves.

[0006] Further, a material injection port is provided in the middle of the upper end surface of the upper pressing plate. The material injection port is connected and communicated with the two groups of upper die cavities respectively through a material distribution pipeline.

[0007] Further, a plurality of lower die limit blocks are provided on the upper end surface of the lower template, and a plurality of upper die limit blocks are provided on the lower end surface of the upper template. The plurality of upper die limit blocks are in limit cooperation with the plurality of lower die limit blocks.

[0008] Further, locking modules are provided on both sides of the upper pressing plate. The upper pressing plate is matched with the lower template through the locking modules.

[0009] Further, an external nitrogen pump is connected and communicated with the air inlet pipe through the nitrogen joint hole.

[0010] The beneficial effects of the present utility model are as follows: Before the nitrogen-filled upper die is docked with the lower die for injection molding and mold opening, the two groups of upper die cavities are connected through the air blowing pipes arranged inside the upper template. Each group of upper die cavities is connected with six air blowing pipes. The external nitrogen pump is connected with the air inlet pipe through the nitrogen joint hole on the upper template. Before the injection molding is completed and the mold is opened, a certain amount of nitrogen is filled into each corner of the upper die cavity to fill the entire cavity, and the vacuum condition inside the wall is eliminated before the mold is opened. Then, the mold is opened normally, and the situation of product surface defects caused by vacuum sticking to the mold can be eliminated. The structure is simple, the cost is low, and the problem of sticking to the mold is solved perfectly. There is no need to continuously experiment with various thick and thin patterns on the rear mold, no need to thicken the pattern surface of the front mold, no need to add undercuts, the original beauty and neatness of the product are maintained, the original appearance surface remains unchanged, the production is stable and reliable, and the costs of repeated mold repair and repeated mold trial are avoided. Description of the Drawings

[0011] Figure 1 is the three-dimensional view of the present utility model;

[0012] Figure 2 is the three-dimensional view of the present utility model in the mold opening state;

[0013] Figure 3 is the sectional view of the present utility model;

[0014] Figure 4 is the three-dimensional view of the hidden part structure of the nitrogen-filled upper die;

[0015] Figure 5 is the three-dimensional view of the hidden part structure of the nitrogen-filled upper die from another perspective;

[0016] Figure 6is a three-dimensional view of the lower mold. Detailed implementation

[0017] As Figures 1 to 6 shown, in this embodiment, the utility model includes a nitrogen-filled upper mold 1 and a lower mold 2. The nitrogen-filled upper mold 1 includes an upper pressure plate 3 and an upper template 4. The upper template 4 is provided with two groups of upper mold cavities 5 and a nitrogen pipeline module 6. The nitrogen pipeline module 6 is arranged inside the upper template 4. Two groups of the upper mold cavities 5 are arranged on the lower end surface of the upper template 4. The nitrogen pipeline module 6 includes an air inlet pipe 61, a branch pipe 62 and a plurality of blowing pipes 63. A nitrogen joint hole 7 is arranged on one side of the upper template 4. The nitrogen joint hole 7 is matched with the air inlet pipe 61. The air inlet pipe 61 is connected and communicated with a plurality of the blowing pipes 63 through the branch pipe 62. A plurality of the blowing pipes 63 are respectively connected and communicated with two groups of the upper mold cavities 5. The lower mold 2 includes a lower carrier plate 8 and a lower template 9. Two groups of lower mold cavities 10 are arranged on the upper end surface of the lower template 9. Two groups of the upper mold cavities 5 are matched with two groups of the lower mold cavities 10. Thus, after the mold is normally injection-molded, gas is introduced into the nitrogen pipeline module arranged inside the upper template 4 through the nitrogen joint hole 7, so that a certain amount of nitrogen is filled in two groups of the upper mold cavities 5, eliminating the local vacuum adhesion between the product and the upper mold cavities 5. The six blowing pipes 63 can effectively fill nitrogen into every corner of the cavity, avoiding the situation of adhesion caused by individual vacuum.

[0018] As Figure 1 and Figure 2 shown, in this embodiment, a plurality of positioning guide shafts 11 are arranged on the lower end surface of the upper template 4, and a plurality of positioning guide sleeves 12 are arranged on the upper end surface of the lower template 9. A plurality of the positioning guide shafts 11 are in positioning cooperation with a plurality of the positioning guide sleeves 12. Thus, during mold closing, through the guiding action of a plurality of the positioning guide shafts 11 and the positioning guide sleeves 12, they are stably fitted, preventing the upper mold cavities 5 and the lower mold cavities 10 from rubbing against each other during the mold closing process and resulting in scrapping.

[0019] As Figures 1 to 4 shown, in this embodiment, a material injection port 13 is arranged in the middle of the upper end surface of the upper pressure plate 3. The material injection port 13 is respectively connected and communicated with two groups of the upper mold cavities 5 through a material distribution pipeline 14. Thus, the material injection port 13 injects materials into the profiling structure between two groups of the upper mold cavities 5 and the lower mold cavities 10 through the material distribution pipeline 14, enabling the injection molding of two groups of products simultaneously, with higher efficiency.

[0020] As Figure 1 and Figure 2As shown, in this embodiment, a number of lower die limit blocks 15 are provided on the upper end surface of the lower template 9, and a number of upper die limit blocks 16 are provided on the lower end surface of the upper template 4. The number of the upper die limit blocks 16 and the number of the lower die limit blocks 15 are in limiting cooperation. Thus, it can be seen that the number of the upper die limit blocks 16 and the number of the lower die limit blocks 15 can prevent vibration during the mold closing and injection molding processes, which may cause the nitrogen-filled upper die 1 and the lower die 2 to shift, resulting in product deformation.

[0021] As Figure 1 and Figure 2 shown, in this embodiment, locking modules 17 are provided on both sides of the upper pressing plate 3. The upper pressing plate 3 is cooperated with the lower template 9 through the locking modules 17. Thus, it can be seen that the locking modules 17 can prevent the material from expanding due to high temperature during the injection molding process, which may lift the nitrogen-filled upper die 1 and cause product deformation.

[0022] As Figure 1 and Figure 2 shown, in this embodiment, an external nitrogen pump is connected and conducted with the air inlet pipe 61 through the nitrogen joint hole 7. Thus, it can be seen that nitrogen is introduced into the air inlet pipe 61 through the nitrogen joint hole 7, and then the nitrogen is introduced into the two upper die cavities 5 through the twelve blowing pipes 63 via the sub-air pipes 62 respectively.

[0023] The working principle of the present utility model: Before the equipment is started, an external nitrogen pump is connected with the air inlet pipe 61 through the nitrogen joint hole 7, the nitrogen-filled upper die 1 and the lower die 2 are closed, locked through the locking modules 17, and materials are poured into the profiling grooves between the two upper die cavities 5 and the two lower die cavities 10 through the injection port 13. After injection molding, the external nitrogen pump injects nitrogen into the air inlet pipe 61, and the air inlet pipe 61 introduces the nitrogen into the twelve blowing pipes 63 through the sub-air pipes 62. Six blowing pipes 63 blow the nitrogen into the gaps between the product and the upper die cavity 5 and into all corners of the qualified cavities, eliminating the vacuum between the product and the upper die cavity 5. After nitrogen filling is completed, the external nitrogen pump is turned off, the locking modules 17 are unlocked, the mold is normally opened, and the product is taken out. By repeating the above steps, the nitrogen de-vacuum membrane of the product can be completed.

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

Claims

1. A mold for eliminating vacuum sticking by nitrogen, comprising a nitrogen-filled upper mold (1) and a lower mold (2), characterized in that: The nitrogen-filled upper mold (1) comprises an upper pressure plate (3) and an upper mold plate (4); the upper mold plate (4) is provided with two groups of upper mold cavities (5) and a nitrogen pipeline module (6); the nitrogen pipeline module (6) is arranged inside the upper mold plate (4); the two groups of upper mold cavities (5) are arranged on the lower end surface of the upper mold plate (4); the nitrogen pipeline module (6) comprises an air inlet pipe (61), an air distribution pipe (62) and a plurality of air blowing pipes (63); and a nitrogen joint hole (7) is provided on one side of the upper mold plate (4). The nitrogen joint hole (7) cooperates with the air inlet pipe (61), the air inlet pipe (61) is connected to a plurality of the air blowing pipes (63) through the air distribution pipe (62), the plurality of the air blowing pipes (63) are respectively connected to two groups of the upper mold cavities (5), the lower mold (2) comprises a download plate (8) and a lower mold plate (9), the upper end surface of the lower mold plate (9) is provided with two groups of lower mold cavities (10), and the two groups of the upper mold cavities (5) cooperate with the two groups of the lower mold cavities (10).

2. A mold for eliminating vacuum sticking by nitrogen according to claim 1, characterized in that: The lower end surface of the upper mold plate (4) is provided with a plurality of positioning guide shafts (11), and the upper end surface of the lower mold plate (9) is provided with a plurality of positioning guide sleeves (12), and the plurality of positioning guide shafts (11) are positioned and matched with the plurality of positioning guide sleeves (12).

3. A mold for eliminating vacuum sticking by nitrogen according to claim 1, characterized in that: A material injection port (13) is provided in the middle of the upper end surface of the upper pressing plate (3), and the material injection port (13) is connected to the two groups of upper mold cavities (5) respectively through a material distribution pipe (14).

4. A mold for eliminating vacuum sticking by nitrogen according to claim 1, characterized in that: The upper end surface of the lower mold plate (9) is provided with a plurality of lower mold limit blocks (15), and the lower end surface of the upper mold plate (4) is provided with a plurality of upper mold limit blocks (16), and the plurality of upper mold limit blocks (16) cooperate with the plurality of lower mold limit blocks (15) in limiting manner.

5. A mold for eliminating vacuum sticking by nitrogen according to claim 1, characterized in that: Locking modules (17) are provided on both sides of the upper pressing plate (3), and the upper pressing plate (3) cooperates with the lower template (9) through the locking modules (17).

6. A mold for eliminating vacuum sticking by nitrogen according to claim 1, characterized in that: The external nitrogen pump is connected to the air inlet pipe (61) via the nitrogen joint hole (7).

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