A mold structure and a method of injection molding using the same

Abstract

The application provides a mold structure and a method for injection molding by using the mold structure. The mold structure comprises an outer mold configured with a receiving groove; a first forming structure detachably arranged in the receiving groove, and a first injection cavity for injection molding a film part is formed between the first forming structure and the side wall of the receiving groove when the first forming structure is arranged in the receiving groove; and a second forming structure detachably arranged in the receiving groove, and a second injection cavity for injection molding a product is formed between the second forming structure and the side wall of the film part when the second forming structure is arranged in the receiving groove. The mold structure provided by the application can form a product with a film surface after demolding, which not only solves the problem of difficult mold demolding, but also makes the outer surface of the product free of wire clamping, and the subsequent polishing is not needed, so that the product yield and mass production are improved, and the cost of batch production is reduced.

Description

Technical Field

[0001] This application relates to the field of mold processing technology, and in particular to a mold structure and a method for injection molding using the same. Background Technology

[0002] Currently, injection molding presents numerous challenges for products with straight exterior surfaces and deep internal cavities.

[0003] Firstly, the lack of draft on the straight surface of the product makes it difficult to demold. Secondly, there are molding lines around the outer straight surface of the product, which need to be sanded. Sanding results in defects such as collapsed corners and irregularities. Additional steps such as painting are required later, which increases costs. Summary of the Invention

[0004] This application provides a mold structure and a method for injection molding using the same, which solves problems such as difficulty in mold ejection and surface roughness grinding in current injection molded products.

[0005] This application provides a mold structure, including:

[0006] An outer mold, wherein a receiving groove is constructed in the outer mold;

[0007] A first molding structure is detachably disposed in the receiving groove. When the first molding structure passes through the receiving groove, a first injection cavity for injection molding a film part is formed between the first molding structure and the side wall of the receiving groove.

[0008] A second molding structure is detachably disposed in the receiving groove. When the second molding structure passes through the receiving groove, a second injection cavity for injection molding products is formed between the second molding structure and the side wall of the film.

[0009] According to a mold structure provided in one embodiment of this application, the outer surface of the film component has a first draft angle, and the inner surface of the film component has a second draft angle, wherein the first draft angle is greater than the second draft angle.

[0010] According to an embodiment of the present application, the first forming structure includes: a first upper punch and a first lower punch that are mated together.

[0011] Both the first upper punch and the first lower punch are detachably disposed in the receiving groove. When the first upper punch and the first lower punch are connected and pass through the receiving groove, the first injection cavity is formed to form the film part by injection molding. The film part and the outer mold are demolded by separating the first upper punch and the first lower punch.

[0012] According to a mold structure provided in an embodiment of this application, the first upper punch and / or the first lower punch are provided with a first extension;

[0013] When the first upper punch and the first lower punch are mated and pass through the receiving groove, the first extension is closed in the gap between the first molding structure and the outer mold.

[0014] According to a mold structure provided in one embodiment of this application, both the first upper punch and the first lower punch include: a soft outer shell and a hard inner shell, wherein the hard inner shell is embedded in the soft outer shell.

[0015] According to a mold structure provided in one embodiment of this application, the second molding structure includes: a second upper punch and a second lower punch that are mated together;

[0016] Both the second upper punch and the second lower punch are detachably disposed in the receiving groove. When both the second upper punch and the second lower punch pass through the receiving groove, the second upper punch cooperates with the second lower punch to form the second injection cavity between itself and the film part, so as to form the product by injection molding, and the demolding of the film part and the product is completed by separating the second upper punch and the second lower punch.

[0017] According to one embodiment of the mold structure provided in this application, the hardness of the second upper punch and the second lower punch is greater than the hardness of the soft outer shell.

[0018] According to a mold structure provided in an embodiment of this application, a second extension is provided on the second upper punch and / or the second lower punch;

[0019] When the second upper punch and the second lower punch are mated and pass through the receiving groove, the second extension is closed in the gap between the second molding structure and the outer mold.

[0020] According to a mold structure provided in one embodiment of this application, the top of the receiving groove is provided with a first opening, and the bottom of the receiving groove is provided with a second opening, with the first opening and the second opening being disposed opposite to each other.

[0021] This application also provides a method for injection molding using the above-described mold structure, including:

[0022] The first molding structure is introduced into the receiving groove of the outer mold, and a first injection cavity is formed between the first molding structure and the side wall of the receiving groove.

[0023] Injection molding is performed into the first injection cavity. After a thin film part is formed in the first injection cavity, the thin film part and the outer mold are demolded.

[0024] The second molding structure is introduced into the receiving groove of the outer mold, and a second injection cavity is formed between the second molding structure and the side wall of the film part.

[0025] Injection molding is performed in the second injection cavity. After the product is formed in the second injection cavity, the film part and the product are demolded.

[0026] The mold structure provided in this application, by setting an outer mold, a first molding structure, and a second molding structure, firstly sets the first molding structure in a receiving groove, so that a first injection cavity is formed between the first molding structure and the side wall of the receiving groove. Then, a thin film part is formed by injection molding in the first injection cavity, and the thin film part and the outer mold are demolded. Then, the second molding structure is set in the receiving groove, so that a second injection cavity is formed between the second molding structure and the side wall of the thin film part. Finally, injection molding is performed in the second injection cavity. After demolding, a product with a thin film on the surface can be formed. This not only solves the problem of difficult mold demolding, but also makes the outer surface of the product free of embedded lines, eliminating the need for subsequent grinding, improving product yield and mass production capability, and reducing the cost of mass production. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is one of the cross-sectional schematic diagrams of a mold structure provided in an embodiment of this application;

[0029] Figure 2 This is a second cross-sectional schematic diagram of a mold structure provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of a thin film component provided in an embodiment of this application;

[0031] Figure 4 This is one of the schematic diagrams of an outer mold provided in an embodiment of this application;

[0032] Figure 5 This is a second schematic diagram of the outer mold provided in one embodiment of this application;

[0033] Figure 6 This is one of the schematic diagrams of the first molding structure provided in an embodiment of this application;

[0034] Figure 7 This is a second schematic diagram of the first molding structure provided in an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the second molding structure provided in an embodiment of this application;

[0036] Figure 9 This is a schematic flowchart of a method for injection molding using a mold structure provided in an embodiment of this application;

[0037] Figure label:

[0038] 1. First molding structure; 11. First upper punch; 111. First extension; 12. First lower punch; 101. Soft outer shell; 102. Hard interior; 2. Second molding structure; 21. Second upper punch; 211. Second extension; 22. Second lower punch; 3. Outer mold; 30. Receiving groove; 31. First cavity; 32. Second cavity; 33. First opening; 34. Second opening; 4. Film part; 41. Outer surface; 42. Inner surface; 5. Product. Detailed Implementation

[0039] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0040] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] This application provides a mold structure. Figure 1 and Figure 2 These are all cross-sectional schematic diagrams of the mold structure, such as... Figure 1 and Figure 2 As shown, the mold structure includes: an outer mold 3, a first molding structure 1, and a second molding structure 2.

[0044] In this embodiment, the outer mold 3 serves as the supporting workpiece for the entire mold structure. The outer mold 3 has a receiving groove 30, which is used to cooperate with the first molding structure 1 and the second molding structure 2 for injection molding. The first molding structure 1 is detachably disposed in the receiving groove 30, and the second molding structure 2 is detachably disposed in the receiving groove 30.

[0045] When the first molding structure 1 passes through the receiving groove 30, a first injection cavity is formed between the first molding structure 1 and the side wall of the injection cavity. For example... Figure 3 As shown, the first injection cavity is used for injection molding the film part 4. The film part 4 has a thin wall thickness of approximately 0.1 to 10 mm. The film part 4 has an outer surface 41 and an inner surface 42. The outer surface 41 is a draft surface, and the inner surface 42 is a straight surface. The film part 4 has the characteristics of high temperature resistance, corrosion resistance, and smooth surface. Moreover, the film part 4 has good flowability. The injection molding material can be ceramic, glass, lightweight alloy, etc.

[0046] When the second molding structure 2 passes through the receiving groove 30, a second injection cavity is formed between the second molding structure 2 and the side wall of the film part 4. The second injection cavity is used for injection molding product 5 (deep cavity part).

[0047] During the injection molding process using this mold structure, such as Figure 1 As shown, the first molding structure 1 is first introduced into the receiving groove 30 of the outer mold 3. Since there is a gap between the first molding structure 1 and the side wall of the receiving groove 30, a first injection cavity is formed between the first molding structure 1 and the side wall of the receiving groove 30.

[0048] After the first molding structure 1 is introduced into the receiving groove 30 of the outer mold 3, injection molding is performed in the first injection cavity. After the film part 4 is formed in the first injection cavity, the first molding structure 1 is removed from the receiving groove 30, and the demolding of the film part 4 and the outer mold 3 is completed. After demolding, the film part 4 is placed in the receiving groove 30.

[0049] Then, as Figure 2 As shown, the second molding structure 2 is then introduced into the receiving groove 30 of the outer mold 3. Since the film part 4 is set in the receiving groove 30 at this time, after the second molding structure 2 is set in the receiving groove 30, a second injection cavity is formed between the side wall of the second molding structure 2 and the film part 4.

[0050] After the second molding structure 2 is introduced into the receiving groove 30 of the outer mold 3, injection molding is performed in the second injection cavity. After the product 5 is formed in the second injection cavity, the second molding structure 2 is removed from the receiving groove 30, completing the demolding of the film part 4 and the product 5. Since the outer surface 41 of the film part 4 is in contact with the side wall of the receiving groove 30 at this time, and the inner surface of the film part 4 is in direct contact with the product 5, the second molding structure 2 can be directly removed during demolding. The film part 4 and the product 5 are demolded simultaneously. By setting the film part 4 on the outer surface of the product 5, not only is the problem of difficult mold release solved, but also the outer surface of the product 5 is free of embedded lines.

[0051] In some embodiments, such as Figure 1 As shown, the outer mold 3 has a thickness L, and the diameter of the receiving groove 30 of the outer mold 3 is larger than the outer diameter of the first molding structure 1, so as to leave space on the inner periphery of the receiving groove 30 for forming the film part 4.

[0052] In some embodiments, combined with Figure 1 , Figure 2 As shown, the outer diameter of the first molding structure 1 is larger than the outer diameter of the second molding structure 2.

[0053] The mold structure provided in this application, by setting an outer mold 3, a first molding structure 1, and a second molding structure 2, firstly sets the first molding structure 1 in the receiving groove 30, so that a first injection cavity is formed between the first molding structure 1 and the side wall of the receiving groove 30. Then, a thin film part 4 is injection molded in the first injection cavity, and the thin film part 4 and the outer mold 3 are demolded. Then, the second molding structure 2 is set in the receiving groove 30, so that a second injection cavity is formed between the second molding structure 2 and the side wall of the thin film part 4. Finally, injection molding is performed in the second injection cavity. After demolding, a product with a thin film on the surface can be formed. This not only solves the problem of difficult mold demolding, but also makes the outer surface of the product free of embedded lines, eliminating the need for subsequent grinding, improving product yield and mass production capability, and reducing the cost of mass production.

[0054] Generally, the outer mold 3 can be made as a single piece. In this example, the mold is made as a split draft mold according to the structure of the deep cavity part, so the outer mold 3 needs to be made as a split mold. Alternatively, a single-end draft mold can be used, and the mold can be made as a single piece.

[0055] In one embodiment, such as Figure 4 and Figure 5 As shown, the outer mold 3 includes a first cavity 31 and a second cavity 32. The first cavity 31 is provided with a first receiving groove, and the second cavity 32 is provided with a second receiving groove. The first cavity 31 and the second cavity 32 are arranged opposite to each other so that the first receiving groove and the second receiving groove cooperate to form a receiving groove 30.

[0056] In this embodiment, the first die 31 is disposed on the left side and the second die 32 is disposed on the right side, and the two are detachably connected to each other. The first die 31 and the second die 32 are provided with a first receiving groove on the side opposite to each other, and the second die 32 is provided with a second receiving groove on the side opposite to each other. Thus, the first receiving groove and the second receiving groove can be spliced ​​together to form a receiving groove 30.

[0057] To facilitate demolding, the outer surface of the film part 4 has a first draft angle, and the inner surface of the film part 4 has a second draft angle, wherein the first draft angle is greater than the second draft angle. Preferably, the outer surface of the film part 4 is a curved surface with a certain draft angle, and the draft angle of the inner surface of the film part 4 is zero degrees. That is, the draft angle of the side of the film part 4 that contacts the receiving groove 30 is greater than the draft angle of the side of the film part 4 that contacts the product.

[0058] During the injection molding process using this mold structure, such as Figure 1 As shown, the first mold cavity 31 and the second mold cavity 32 are first joined together, and then the first molding structure 1 is introduced into the receiving groove 30 of the outer mold 3. Since there is a gap between the first molding structure 1 and the side wall of the receiving groove 30, a first injection cavity is formed between the first molding structure 1 and the side wall of the receiving groove 30.

[0059] After the first molding structure 1 is introduced into the receiving groove 30 of the outer mold 3, injection molding is performed in the first injection cavity. After the film part 4 is formed in the first injection cavity, the first molding structure 1 returns and is removed from the receiving groove 30. The first die 31 and the second die 32 rotate 180 degrees to complete the demolding of the film part 4. After demolding, the film part 4 is placed in the receiving groove 30.

[0060] Then, as Figure 2 As shown, the second molding structure 2 is then introduced into the receiving groove 30 of the outer mold 3. Since the film part 4 is set in the receiving groove 30 at this time, after the second molding structure 2 is set in the receiving groove 30, a second injection cavity is formed between the side wall of the second molding structure 2 and the film part 4.

[0061] After the second molding structure 2 is introduced into the receiving groove 30 of the outer mold 3, injection molding is performed in the second injection cavity. After the product 5 is formed in the second injection cavity, the second molding structure 2 returns and is removed from the receiving groove 30 (or the first cavity 31 and the second cavity 32 are separated), completing the demolding of the film part 4 and the product 5. Since the outer surface 41 of the film part 4 is in contact with the side wall of the receiving groove 30 at this time, while the inner surface of the film part 4 is in direct contact with the product 5, the second molding structure 2 can be directly removed during demolding. Moreover, the draft angle of the side of the film part 4 in contact with the receiving groove 30 is greater than the draft angle of the side of the film part 4 in contact with the product, so the film part 4 and the product 5 can be demolded simultaneously. By setting the film part 4 on the outer surface of the product 5, not only is the problem of difficult mold demolding solved, but also the outer surface of the product 5 is free of embedded lines.

[0062] In another embodiment, such as Figure 1 , Figure 6 and Figure 7 As shown, the first molding structure 1 includes a first upper punch 11 and a first lower punch 12 that are mated together. Both the first upper punch 11 and the first lower punch 12 are detachably disposed in the receiving groove 30. When the first upper punch 11 and the first lower punch 12 are mated together and pass through the receiving groove 30, the first upper punch 11 and the first lower punch 12 form a first injection cavity between the upper punch 11 and the side wall of the receiving groove 30. The demolding of the film part 4 and the outer mold 3 is completed by the separation of the first upper punch 11 and the first lower punch 12.

[0063] In this embodiment, the first molding structure 1 includes a first upper punch 11 disposed on the upper side and a first lower punch 12 disposed on the lower side. During the return stroke of the first molding structure 1, the first upper punch 11 returns upwards, and the first lower punch 12 returns downwards, completing the separation of the first molding structure 1 from the receiving groove 30, thereby enabling the demolding of the film part 4 and the outer mold 3. When the first upper punch 11 and the first lower punch 12 close, the first upper punch 11 closes downwards, and the first lower punch 12 closes upwards.

[0064] To ensure the molding of the film part 4, a first extension 111 is provided on the first upper punch 11 or the first lower punch 12, or the first upper punch 11 and the first lower punch 12 are both provided with the first extension 111. When the first upper punch 11 and the first lower punch 12 are mated and pass through the receiving groove 30, the first extension 111 is closed in the gap between the first molding structure 1 and the outer mold 3.

[0065] In this embodiment, both the first upper punch 11 and the first lower punch 12 are provided with first extensions 111. The first extension 111 on the first upper punch 11 closes the upper side of the first molding structure 1 and the outer mold 3, and the first extension 111 on the first lower punch 12 closes the lower side of the first molding structure 1 and the outer mold 3. This forms a closed first injection cavity, and after injection molding, a thin film part 4 can be formed in the sealed first injection cavity.

[0066] In some embodiments, such as Figure 1 , Figure 6 and Figure 7 As shown, both the first upper punch 11 and the first lower punch 12 include a soft outer shell 101 and a hard inner shell 102, with the hard inner shell 102 embedded in the soft outer shell 101. The soft outer shell 101 has a groove, and the hard inner shell 102 fills the groove. The hard inner shell 102 provides support strength for the entire first upper punch 11 and first lower punch 12. The soft outer shell 101 is made of high-temperature resistant soft rubber or an elastomer, used for molding a straight surface, and can be forcibly demolded. When demolding the film part 4, the soft outer shell 101 on the first upper punch 11 and first lower punch 12 can be forcibly demolded directly by moving the first upper punch 11 and first lower punch 12.

[0067] In another embodiment, such as Figure 2 and Figure 8 As shown, the second molding structure 2 includes a second upper punch 21 and a second lower punch 22 that are mated together. Both the second upper punch 21 and the second lower punch 22 are detachably disposed in the receiving groove 30. When both the second upper punch 21 and the second lower punch 22 pass through the receiving groove 30, the second upper punch 21, in conjunction with the second lower punch 22, forms a second injection cavity between itself and the side wall of the receiving groove 30, thereby forming a product through injection molding. The separation of the second upper punch 21 and the second lower punch 22 completes the demolding of the film part 4 and the product.

[0068] In this embodiment, the second molding structure 2 includes a second upper punch 21 disposed on the upper side and a second lower punch 22 disposed on the lower side. During the return stroke of the second molding structure 2, the second upper punch 21 returns upwards, and the first lower punch 22 returns downwards, completing the separation of the second molding structure 2 from the receiving groove 30, thereby enabling the demolding of the film part 4 and the product 5. When the second upper punch 21 and the second lower punch 22 close, the second upper punch 21 closes downwards, and the second lower punch 22 closes upwards. Furthermore, the second upper punch 21 and the second lower punch 22 can be simultaneously lifted by a fixed lifting member to complete the demolding of the film part 4 and the product 5.

[0069] To ensure the molding of product 5, a second extension 211 is provided on the second upper punch 21 or the second lower punch 22, or both the second upper punch 21 and the second lower punch 22 are provided with a second extension 211. When the second upper punch 21 and the second lower punch 22 are mated and pass through the receiving groove 30, the second extension 211 is closed in the gap between the second molding structure 2 and the outer mold 3. Both the second upper punch 21 and the second lower punch 22 are hard molds, and the hardness of the second upper punch 21 and the second lower punch 22 is greater than the hardness of the soft outer shell 101, so that the film part 4 and the product can be demolded as a whole during subsequent demolding.

[0070] In this embodiment, the second upper punch 21 and the second lower punch 22 are both provided with second extensions 211. The second extension 211 on the second upper punch 21 closes the upper side of the second molding structure 2 and the outer mold 3, and the second extension 211 on the second lower punch 22 closes the lower side of the second molding structure 2 and the outer mold 3. This forms a closed second injection cavity, and after injection molding, the product 5 can be formed in the sealed second injection cavity.

[0071] Based on the above embodiments, in one embodiment, such as Figures 1 to 5 As shown, the top of the receiving groove 30 is provided with a first opening 33, and the bottom of the receiving groove 30 is provided with a second opening 34. The first opening 33 and the second opening 34 are arranged opposite to each other.

[0072] During the injection molding process using this mold structure, such as Figure 1 As shown, the first die 31 and the second die 32 are first aligned and spliced ​​together. Then, the first upper punch 11 is introduced into the receiving groove 30 of the outer mold 3 from the first opening 33, and the first lower punch 12 is introduced into the receiving groove 30 of the outer mold 3 from the second opening 34. Since there is a gap between the first upper punch 11 and the first lower punch 12 and the side wall of the receiving groove 30, a first injection cavity is formed between the first upper punch 11 and the first lower punch 12 and the side wall of the receiving groove 30.

[0073] After the first upper punch 11 and the first lower punch 12 are guided into the receiving groove 30 of the outer mold 3, injection molding is performed in the first injection cavity. After the film part 4 is formed in the first injection cavity, the first upper punch 11 and the first lower punch 12 return to their original positions, removing them from the receiving groove 30. The first die 31 and the second die 32 rotate 180 degrees, completing the demolding of the outer mold 3 and the film part 4. After demolding, the film part 4 is placed in the receiving groove 30.

[0074] Then, as Figure 2As shown, the second upper punch 21 is then introduced into the receiving groove 30 of the outer mold 3 from the first opening 33, and the second lower punch 22 is introduced into the receiving groove 30 of the outer mold 3 from the second opening 34. Since the film part 4 is set in the receiving groove 30 at this time, after the second upper punch 21 and the second lower punch 22 are set in the receiving groove 30, a second injection cavity is formed between the second upper punch 21 and the second lower punch 22 and the side wall of the film part 4.

[0075] Injection molding is performed in the second injection cavity. After product 5 is formed in the second injection cavity, the second upper punch 21 and the second lower punch 22 return vertically (or simultaneously eject from one side), removing the second upper punch 21 and the second lower punch 22 from the receiving groove 30 (or separating the first die 31 and the second die 32), thus completing the demolding of the film part 4 and product 5. Since the outer surface 41 of the film part 4 is in contact with the side wall of the receiving groove 30 at this time, while the inner surface of the film part 4 is in direct contact with product 5, the second molding structure 2 can be directly removed during demolding. The film part 4 and product 5 are demolded simultaneously. By setting the film part 4 on the outer surface of product 5, not only is the problem of difficult mold ejection solved, but also the absence of embedded lines on the outer surface of product 5 is ensured.

[0076] This application also provides a method for injection molding a mold structure, such as... Figure 9 As shown, the injection molding method includes the following steps:

[0077] Step S101: The first molding structure is introduced into the receiving groove of the outer mold, and a first injection cavity is formed between the first molding structure and the side wall of the receiving groove.

[0078] Step S102: Inject the first injection cavity. After the film part is formed in the first injection cavity, demold the film part and the outer mold.

[0079] Step S103: The second molding structure is introduced into the receiving groove of the outer mold to form a second injection molding between the second molding structure and the side wall of the film part.

[0080] Step S104: Inject the second injection cavity. After the product is formed in the second injection cavity, demold the film part and the product.

[0081] Specifically, during the injection molding process using this mold structure, such as Figure 1 As shown,

[0082] First, the first die 31 and the second die 32 are aligned and spliced ​​together. Then, the first upper punch 11 of the first molding structure 1 is introduced into the receiving groove 30 of the outer mold 3 from the first opening 33, and the first lower punch 12 of the first molding structure 1 is introduced into the receiving groove 30 of the outer mold 3 from the second opening 34. Since there is a gap between the first upper punch 11 and the first lower punch 12 and the side wall of the receiving groove 30, a first injection cavity is formed between the first upper punch 11 and the first lower punch 12 and the side wall of the receiving groove 30.

[0083] After the first upper punch 11 and the first lower punch 12 are guided into the receiving groove 30 of the outer mold 3, injection molding begins in the first injection cavity. After the film part 4 is formed in the first injection cavity, the first upper punch 11 and the first lower punch 12 return vertically, removing them from the receiving groove 30. The first die 31 and the second die 32 rotate 180 degrees, completing the demolding of the outer mold 3 and the film part 4. After demolding, the film part 4 is placed in the receiving groove 30.

[0084] Then, as Figure 2 As shown, the second upper punch 21 of the second molding structure 2 is then introduced from the first opening 33 into the receiving groove 30 of the outer mold 3, and the second lower punch 22 of the second molding structure 2 is introduced from the second opening 34 into the receiving groove 30 of the outer mold 3. Since the film part 4 is set in the receiving groove 30 at this time, after the second upper punch 21 and the second lower punch 22 are set in the receiving groove 30, a second injection cavity is formed between the second upper punch 21 and the second lower punch 22 and the side wall of the film part 4.

[0085] After the second molding structure 2 is introduced into the receiving groove 30 of the outer mold 3, the second upper punch 21 and the second lower punch 22 return vertically (or simultaneously eject from one side), removing the second upper punch 21 and the second lower punch 22 from the receiving groove 30 (or separating the first die 31 and the second die 32), thus completing the demolding of the film part 4 and the product 5. Since the outer surface 41 of the film part 4 is in contact with the side wall of the receiving groove 30 at this time, while the inner surface of the film part 4 is in direct contact with the product 5, the second molding structure 2 can be directly removed during demolding, and the film part 4 and the product 5 are demolded simultaneously. By setting the film part 4 on the outer surface of the product 5, not only is the problem of difficult mold ejection solved, but also the outer surface of the product 5 is free of embedded lines.

[0086] The above embodiments are for illustrative purposes only and are not intended to limit the scope of this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should be covered within the scope of the claims of this application.

Claims

1. A mold structure, characterized in that, include: An outer mold, wherein a receiving groove is constructed in the outer mold; A first molding structure is detachably disposed in the receiving groove. When the first molding structure passes through the receiving groove, a first injection cavity for injection molding a film part is formed between the first molding structure and the side wall of the receiving groove. The first molding structure includes: a first upper punch and a first lower punch that are mated to each other; both the first upper punch and the first lower punch are detachably disposed in the receiving groove. When the first upper punch and the first lower punch are mated and pass through the receiving groove, the first injection cavity is formed to form the film part by injection molding, and the film part and the outer mold are demolded by separating the first upper punch and the first lower punch; both the first upper punch and the first lower punch include: a soft outer shell and a hard inner shell, wherein the hard inner shell is embedded in the soft outer shell; A second molding structure is detachably disposed in the receiving groove. When the second molding structure and the film part pass through the receiving groove, a second injection cavity for injection molding products is formed between the second molding structure and the side wall of the film part.

2. The mold structure according to claim 1, characterized in that, The outer surface of the film component has a first draft angle, and the inner surface of the film component has a second draft angle, wherein the first draft angle is greater than the second draft angle.

3. The mold structure according to claim 2, characterized in that, The first upper punch and / or the first lower punch are provided with a first extension; When the first upper punch and the first lower punch are mated and pass through the receiving groove, the first extension is closed in the gap between the first molding structure and the outer mold.

4. The mold structure according to claim 2, characterized in that, The second forming structure includes: a second upper punch and a second lower punch that are mated together; Both the second upper punch and the second lower punch are detachably disposed in the receiving groove. When both the second upper punch and the second lower punch pass through the receiving groove, the second upper punch cooperates with the second lower punch to form the second injection cavity between itself and the film part, so as to form the product by injection molding, and the demolding of the film part and the product is completed by separating the second upper punch and the second lower punch.

5. The mold structure according to claim 4, characterized in that, The hardness of the second upper punch and the second lower punch is greater than the hardness of the soft outer shell.

6. The mold structure according to claim 4, characterized in that, The second upper punch and / or the second lower punch are provided with a second extension; When the second upper punch and the second lower punch are mated and pass through the receiving groove, the second extension is closed in the gap between the second molding structure and the outer mold.

7. The mold structure according to any one of claims 1-6, characterized in that, The top of the receiving groove is provided with a first opening, and the bottom of the receiving groove is provided with a second opening, with the first opening and the second opening being arranged opposite to each other.

8. A method for injection molding using a mold structure as described in any one of claims 1-7, characterized in that, include: The first molding structure is introduced into the receiving groove of the outer mold, and a first injection cavity is formed between the first molding structure and the side wall of the receiving groove. Injection molding is performed into the first injection cavity. After a thin film part is formed in the first injection cavity, the thin film part and the outer mold are demolded. The second molding structure is introduced into the receiving groove of the outer mold, and a second injection cavity is formed between the second molding structure and the side wall of the film part. Injection molding is performed in the second injection cavity. After the product is formed in the second injection cavity, the film part and the product are demolded.

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