Exhaust structure of double-injection forming die and double-injection forming die

Abstract

The utility model relates to the technical field of bijection molding, in particular to a bijection molding die exhaust structure and a bijection molding die, the structure comprises a female die assembly and a bijection male die assembly, the female die assembly comprises a first injection product, and a double-injection area of the first injection product is provided with an exhaust storage hole; the second-injection male mold assembly comprises a second-injection mold cavity, the second-injection mold cavity and the outer wall of the first-injection product form an injection molding space, and an exhaust storage hole in the first-injection product is used for exhausting gas and storing part of injection molding raw materials during injection molding in the injection molding space. According to the technical scheme, the exhaust structure of the bijection forming die is optimized, the novel exhaust structure enables the appearance face of a bijection forming product to be free of burrs, bubbles or bright marks and the like, the formed product does not need manual secondary machining, the product forming quality is higher, the process is simpler, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of double-shot molding, in particular to a double-shot molding mold exhaust structure and a double-shot molding mold. Background Art

[0002] Double-shot plastic products are generally made of soft and hard plastics. For example, the hard plastic part is made of polycarbonate (PC) or thermoplastic polymer structural material (ABS), and the soft plastic part is made of thermoplastic polyurethane elastomer rubber (TPU). When TPU materials are injection molded, due to its good fluidity, it is easy to cause injection burrs on the molded products. In addition, since a large amount of gas is generated when TPU materials are melted, injection molded products are prone to problems such as bubbles and shiny appearance.

[0003] In view of the above problems, when designing the molding mold, an exhaust structure can be designed at the parting surface of the mold. The gas generated during injection molding can be discharged in time through the exhaust structure, thereby avoiding / reducing the impact of the gas in the cavity on the product. However, due to the existence of the exhaust structure, burrs and even step differences will be generated on the parting surface during molding. For products with burrs, post-processing is required to remove the burrs. At present, the burr removal operation process is: the product is frozen with liquid nitrogen, so that the burrs of the soft TPU will fall off automatically after hardening, and then the burrs are manually scraped with a scraper to obtain a double-shot product without burrs.

[0004] It can be seen that the current mold structure design leads to a low yield of double-shot products, and problems such as bubbles, trapped air or bright marks cannot be completely solved. The burrs produced also need to be processed by liquid nitrogen equipment and manual processing, which is costly. Utility Model Content

[0005] In order to solve at least the above technical problems existing in the prior art, the utility model provides a double-shot molding die exhaust structure and a double-shot molding die.

[0006] On the one hand, the utility model provides a double-shot molding mold exhaust structure, including a female mold component and a two-shot male mold component; the female mold component includes a one-shot product, and the double-shot area of ​​the one-shot product is provided with an exhaust storage hole; the two-shot male mold component includes a two-shot mold cavity, and the two-shot mold cavity and the outer wall of the one-shot product form an injection space, and the exhaust storage hole on the one-shot product is used to exhaust gas and store part of the injection raw material during injection molding in the injection space.

[0007] In some embodiments, it also includes a one-shot male mold assembly; the one-shot male mold assembly includes an one-shot mold cavity, and a raised columnar structure is arranged in the one-shot mold cavity at a position corresponding to the double-shot area of ​​the one-shot product, and the columnar structure is used to form the exhaust storage hole on the one-shot product.

[0008] In some embodiments, the exhaust storage hole includes an air inlet end and an air outlet end; the air inlet end of the exhaust storage hole is located on the outside of the one-shot product, and the air outlet end of the exhaust storage hole is located on the inside of the one-shot product; along the direction from the air inlet end to the air outlet end of the exhaust storage hole, the aperture of the exhaust storage hole gradually decreases.

[0009] In some embodiments, the two-shot male mold assembly further includes an exhaust member for exhausting gas within the one-shot product.

[0010] In some embodiments, the exhaust member is a mold insert; the mold insert includes an air inlet and an exhaust port, the air inlet of the mold insert is located on the inner side of the first-shot product, and the exhaust port of the mold insert is located on the outer side of the second-shot male mold assembly.

[0011] In some embodiments, the air inlet of the mold inlet is connected to the air outlet end of the exhaust storage hole to form a continuous exhaust channel.

[0012] In some embodiments, the one-shot product includes a main body and an annular vertical edge, the edge of the main body is provided with the annular vertical edge, and the annular vertical edge is a double-shot area of ​​the one-shot product.

[0013] In some embodiments, a plurality of the exhaust and material storage holes are disposed on the annular vertical edge and along the length direction of the annular vertical edge.

[0014] In some embodiments, the two-shot male mold assembly includes multiple injection ports connected to the injection space; or, the two-shot male mold assembly includes multiple injection ports connected to the injection space, and the multiple injection ports are evenly distributed on the injection space.

[0015] On the other hand, the utility model further provides a double-shot molding die, comprising the double-shot molding die exhaust structure.

[0016] The utility model provides a double-shot molding mold exhaust structure and a double-shot molding mold. When the first shot product is molded, an exhaust storage hole is formed. When the second shot product (double-shot product) is molded, as the injection molding material enters the injection molding space, the gas in the injection molding space and the gas generated during the injection molding process are discharged through the exhaust storage hole. In order to fully exhaust the gas, a slightly larger amount of injection molding material is injected, and part of the injection molding material will also enter the exhaust storage hole. The technical solution of the utility model optimizes the exhaust structure of the double-shot molding mold. The new exhaust structure makes the appearance of the double-shot molding product free of burrs, bubbles or bright marks, etc., and the molded product does not require manual secondary processing, so that the product molding quality is higher, the process is simpler and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description below with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, wherein:

[0018] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0019] Figure 1 A front view of a double-shot product in a double-shot molding die exhaust structure provided by an embodiment of the utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the local structure on the inner side of point A in the middle;

[0021] Figure 3 for Figure 1 Schematic diagram of the partial structure of the first-shot product;

[0022] Figure 4 for Figure 1 Schematic diagram of the partial structure of the second-stage product;

[0023] Figure 5 A schematic diagram of the structure of a female mold component and a single-shot male mold component in a double-shot molding mold exhaust structure provided by an embodiment of the utility model;

[0024] Figure 6 for Figure 5 A cross-sectional view of

[0025] Figure 7 A schematic diagram of the local structure of a one-shot male mold assembly in a double-shot molding mold exhaust structure provided by an embodiment of the utility model when molding a one-shot product;

[0026] Figure 8 A cross-sectional view of an exhaust component in a double-injection mold exhaust structure provided in an embodiment of the utility model.

[0027] In the figure:

[0028] 1: female mold assembly; 2: two-shot male mold assembly; 3: one-shot product; 31: main body; 32: annular vertical edge; 4: exhaust storage hole; 5: two-shot product; 6: one-shot male mold assembly; 7: columnar structure; 8: exhaust part. DETAILED DESCRIPTION

[0029] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] The embodiment of the utility model provides a double-shot molding mold exhaust structure, including a female mold assembly, a one-shot male mold assembly and a two-shot male mold assembly. The female mold assembly cooperates with the one-shot male mold assembly to realize the injection molding of a one-shot product, wherein an exhaust storage hole for circulating gas and injection molding raw materials is provided on the molded one-shot product, and the exhaust storage hole is used for exhaust operation during the two-shot injection molding. The two-shot male mold assembly cooperates with the female mold assembly, and when molding a double-shot product, the exhaust storage hole is used for exhaust operation, without the need to set up an additional exhaust structure.

[0031] Hereinafter, in conjunction with the accompanying drawings, various components of the double-shot molding die exhaust structure provided by the embodiment of the utility model, as well as the positional relationship and connection relationship between the various components are described in detail.

[0032] like Figure 1 As shown, a double-shot product is formed by a double-shot molding mold. The double-shot product in the figure includes a one-shot product 3 and a two-shot product 5, wherein the one-shot product 3 is formed by the cooperation of the female mold component 1 and the one-shot male mold component 6, and then, the two-shot product 5 is formed on the one-shot product 3 by the cooperation of the female mold component 1 and the two-shot male mold component 2.

[0033] like Figure 5 and Figure 6 As shown, it is a schematic diagram of the female mold assembly 1 and the one-shot male mold assembly 6 cooperating to form a one-shot product 3. The female mold assembly 1 and the one-shot male mold assembly 6 cooperate to form an injection molding space, and the material of the one-shot product 3 is injection molded in the injection molding space. In the embodiment of the utility model, the injection molding process is not limited.

[0034] In the embodiment of the utility model, Figure 7As shown, the one-shot mold assembly 6 includes a one-shot mold cavity, and a protruding columnar structure 7 is arranged in the one-shot mold cavity at a position corresponding to the double-shot area of ​​the one-shot product 3. The columnar structure 7 is used to form a protruding columnar structure 7 on the one-shot product 3. Figure 3 Specifically, the one-shot male mold assembly 6 cooperates with the female mold assembly 1 to form an injection molding space for molding the one-shot product 3, and the columnar structure 7 is located in the injection molding space, as shown in FIG. Figure 3 As shown, after the first shot product 3 is formed, an exhaust storage hole 4 is formed thereon. After the first shot product 3 is formed, the first shot product 3 and the female mold assembly 1 also need to cooperate with the second shot male mold assembly 2 to form a second shot product 5 (double shot product).

[0035] The double-shot area of ​​the one-shot product 3 can be explained as: when the double-shot product is formed, the one-shot product 3 cooperates with the two-shot male mold assembly 2 to form one side of the injection space; that is, this side cooperates with the two-shot male mold assembly 2 to enclose the space for injecting the double-shot product.

[0036] In the embodiment of the utility model, the exhaust storage hole 4 includes an air inlet end and an air outlet end; the air inlet end of the exhaust storage hole 4 is located on the outside of a shot product 3, and the air outlet end of the exhaust storage hole 4 is located on the inside of a shot product 3; along the direction from the air inlet end to the air outlet end of the exhaust storage hole 4, the aperture of the exhaust storage hole 4 gradually decreases.

[0037] The outer side of the one-shot product 3 can be interpreted as: the side elevation of the outer side cooperates with the two-shot male mold assembly 2 to form an injection space for molding the double-shot product, and the inner side of the corresponding one-shot product 3 is the opposite side of the outer side.

[0038] The shape of the exhaust storage hole 4 is determined by the contour of the columnar structure 7 in the cavity of the injection mold. The columnar structure 7 is set to have a large outer diameter at one end and a small outer diameter at the other end, thereby forming a structure in which the aperture of the exhaust storage hole 4 gradually decreases. By setting the exhaust storage hole 4 with this structure, when the exhaust storage hole 4 is under pressure during the exhaust operation, the pressure of the gas during exhaust gradually increases due to the reduction of the exhaust aperture, which is conducive to the accelerated exhaust of the gas.

[0039] In the embodiment of the utility model, the exhaust material storage hole 4 with a gradually decreasing aperture is used, which is conducive to timely exhausting the gas, thereby avoiding / reducing the impact of the gas on the double-shot molding product.

[0040] In the embodiment of the utility model, the two-shot male mold assembly 2 includes a two-shot mold cavity, and the two-shot mold cavity and the outer wall of the one-shot product 3 form an injection molding space. The exhaust storage hole 4 on the one-shot product 3 is used to exhaust gas and store part of the injection molding material during injection molding in the injection molding space. The two-shot male mold assembly 2 cooperates with the female mold assembly 1, and Figure 5 and Figure 6 The schematics shown are similar.

[0041] The outer wall of the first shot product 3 and the second shot mold cavity enclose an injection space for injection molding a double shot molded product, wherein Figure 2 As shown, the exhaust material storage hole 4 is located on the outer wall of the first shot product 3 , and when the second shot product 5 is formed, the exhaust material storage hole 4 is used to perform exhaust operation on the second shot product 5 .

[0042] In the embodiment of the utility model, the exhaust operation is performed through the exhaust storage hole 4 during the molding of the two-shot product 5. No additional exhaust structure is required on the two-shot mold assembly, that is, no exhaust structure is required on the side where the appearance surface of the two-shot molded product is located. The new exhaust storage hole 4 can also complete the exhaust operation, and will not form burrs, bubbles or bright marks on the appearance surface, which will affect the appearance surface.

[0043] Compared with the prior art, in the embodiment of the present invention, when the double-shot product is formed, the exhaust direction is moved from the outer side of the two-shot male mold component 2 to the side of the female mold component 1, so the female mold component 1 needs to be exhausted. Figure 8 As shown, the two-shot male mold assembly 2 also includes an exhaust member 8 for exhausting the gas in the first-shot product 3 .

[0044] For example, the exhaust member 8 is a mold inlet; the mold inlet includes an air inlet and an exhaust port, the air inlet of the mold inlet is located on the inner side of the first-shot product 3, and the exhaust port of the mold inlet is located on the outer side of the second-shot male mold assembly 2. The mold inlet plays the role of exhausting gas from the inside of the second-shot male mold assembly 2 to the outside. For example, the air inlet of the mold inlet is connected to the air outlet end of the exhaust storage hole 4, thereby forming a continuous exhaust channel. When the double-shot product is molded, the gas in the injection space is effectively and timely discharged.

[0045] Taking the shell molding of a laptop computer as an example, the double-shot molding product is the bottom shell of the laptop computer system end or the top shell of the laptop computer display end.

[0046] like Figure 3 As shown, the bottom shell or top shell structure includes a main body 31 in a rectangular shape, and a raised annular vertical edge 32 is arranged on the edge of the main body 31, wherein the main body 31 and the annular vertical edge 32 are injection molded by the one-shot product 3, and when the two-shot product 5 is injection molded, the two-shot structure is molded outside the annular vertical edge 32, thereby forming a two-shot product. That is, the annular vertical edge 32 is the two-shot area of ​​the one-shot product 3.

[0047] In the embodiment of the utility model, multiple exhaust storage holes 4 are arranged on the annular vertical edge 32 along the length direction of the annular vertical edge 32. When the double-shot product is formed, the multiple exhaust storage holes 4 perform exhaust operations synchronously to timely exhaust the gas in the two-shot injection molding space.

[0048] For example, the two-shot male mold assembly 2 includes a plurality of injection ports connected to the injection space; when the two-shot product 5 is formed, the plurality of injection ports perform injection molding operations simultaneously, or, for example, the plurality of injection ports are evenly distributed on the injection space. An annular injection space is formed outside the annular vertical edge 32, and a plurality of injection ports are evenly arranged on the annular injection space.

[0049] When the two-shot product 5 is formed, the two-shot injection molding raw materials are injected into the multiple injection ports, and the gas in the injection space is discharged from the adjacent exhaust storage hole 4. Figure 2 and Figure 4 As shown, when the double-shot product (two-shot product 5) is being molded, the amount of the two-shot injection molding raw material injected into the injection molding space is greater than the capacity of the injection molding space, so the exhaust storage hole 4 can be exhausted in time, and part of the two-shot injection molding raw material can also be injected. The above injection molding method design effectively ensures that the gas is fully discharged, and because the exhaust storage hole 4 is located inside the two-shot product, even if the exhaust storage hole 4 enters part of the injection molding raw material, it will not affect the appearance of the two-shot product.

[0050] The embodiment of the utility model further provides a double-shot molding die, comprising the double-shot molding die exhaust structure.

[0051] The female mold assembly 1 cooperates with the one-shot male mold assembly 6 to injection mold the one-shot product 3. For example, the one-shot product 3 is made of hard plastic. Subsequently, the female mold assembly 1 cooperates with the two-shot male mold assembly 2 to injection mold the two-shot product 5 in the double-shot area (annular elevation) of the one-shot product 3, thus completing the molding of the two-shot product. For example, the two-shot product 5 is made of soft rubber material.

[0052] In the double-shot molding mold, the exhaust structure is moved to the inner side of the double-shot molding product. During the exhaust operation, the appearance of the double-shot product is no longer affected, thereby improving the product molding quality of the mold.

[0053] The utility model provides a double-shot molding mold exhaust structure and a double-shot molding mold. When the first shot product 3 is molded, the exhaust storage hole 4 is formed. When the second shot product 5 (double-shot product) is molded, as the injection molding raw material enters the injection molding space, the gas in the injection molding space and the gas generated during the injection molding process are discharged through the exhaust storage hole 4. In order to fully exhaust, part of the injection molding raw material will also enter the exhaust storage hole 4. The technical solution of the utility model optimizes the exhaust structure of the double-shot molding mold. The new exhaust structure makes the appearance of the double-shot molding product free of burrs, bubbles or bright marks, etc., and the molded product does not need manual secondary processing, so that the product molding quality is higher, the process is simpler and the cost is lower, and the yield rate of the double-shot product is increased by more than 5%.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A double-shot molding die exhaust structure, characterized in that: It comprises a female mold component (1) and a two-shot male mold component (2); The master mold assembly (1) comprises a one-shot product (3), and a double-shot area of ​​the one-shot product (3) is provided with an exhaust material storage hole (4); The two-shot male mold assembly (2) comprises a two-shot mold cavity, wherein the two-shot mold cavity and the outer wall of the one-shot product (3) form an injection molding space, and the exhaust material storage hole (4) on the one-shot product (3) is used to exhaust gas and store part of the injection molding material during injection molding in the injection molding space.

2. The double-shot molding die exhaust structure according to claim 1, characterized in that: Also includes a first shot male mold assembly (6); The one-shot male mold assembly (6) comprises an injection mold cavity, a protruding columnar structure (7) is arranged in the one-shot mold cavity at a position corresponding to the double-shot area of ​​the one-shot product (3), and the columnar structure (7) is used to form the exhaust material storage hole (4) on the one-shot product (3).

3. The double-shot molding die exhaust structure according to claim 1, characterized in that: The exhaust material storage hole (4) comprises an air inlet end and an air outlet end; The air inlet end of the exhaust material storage hole (4) is located on the outside of the one-shot product (3), and the air outlet end of the exhaust material storage hole (4) is located on the inside of the one-shot product (3); Along the direction from the air inlet end to the air outlet end of the exhaust material storage hole (4), the aperture of the exhaust material storage hole (4) gradually decreases.

4. The double-shot molding die exhaust structure according to claim 3, characterized in that: The two-shot male mold assembly (2) further comprises an exhaust component (8), wherein the exhaust component (8) is used to exhaust gas in the one-shot product (3).

5. The double-shot molding die exhaust structure according to claim 4, characterized in that: The exhaust member (8) is a mold insert; The mold insert comprises an air inlet and an air outlet, wherein the air inlet of the mold insert is located on the inner side of the first-shot product (3), and the air outlet of the mold insert is located on the outer side of the second-shot male mold assembly (2).

6. The double-shot molding die exhaust structure according to claim 5, characterized in that: The air inlet of the mold inlet is connected to the air outlet end of the exhaust material storage hole (4), thereby forming a continuous exhaust channel.

7. The double-shot molding die exhaust structure according to any one of claims 1 to 6, characterized in that: The one-shot product (3) comprises a main body (31) and an annular vertical edge (32); the edge of the main body (31) is provided with the annular vertical edge (32); the annular vertical edge (32) is a double-shot area of ​​the one-shot product (3).

8. The double-shot molding die exhaust structure according to claim 7, characterized in that: Located on the annular vertical edge (32), a plurality of exhaust and material storage holes (4) are arranged along the length direction of the annular vertical edge (32).

9. The double-shot molding die exhaust structure according to claim 8, characterized in that: The two-shot male mold assembly (2) comprises a plurality of injection ports connected to the injection space; or, The two-shot male mold assembly (2) comprises a plurality of injection ports connected to the injection space, and the plurality of injection ports are evenly distributed on the injection space.

10. A double-shot molding mold, characterized in that: The invention comprises a double-shot molding die exhaust structure as claimed in any one of claims 1 to 9.

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