Inverted buckle demolding structure and injection mold applying same

Abstract

The utility model provides a back-off demoulding structure and an injection mould applying the same, the back-off demoulding structure comprises slide block inserts, the slide block inserts comprise a first slide block insert, a second slide block insert and a third slide block insert, the second slide block insert is sleeved outside the third slide block insert, the first slide block insert is sleeved outside the second slide block insert, and the third slide block insert is sleeved outside the second slide block insert. The length of the first sliding block insert is smaller than that of the second sliding block insert, and an inverted groove is formed in the outer surface of the second sliding block insert. According to the utility model, the insert for forming the inverted buckle structure is designed into a split structure, when the mold is demolded after injection molding, the slide block inserts are withdrawn from the product in batches, and when the second slide block insert and the third slide block insert are withdrawn from the product, the first slide block insert plays a role in limiting and fixing the product; and therefore, the second sliding block insert and the third sliding block insert can be smoothly withdrawn. The injection molding part does not need to be split into two products, another set of injection mold does not need to be independently arranged at the inverted buckle position of the product, and the manufacturing procedure after the inverted buckle position of the product is assembled is omitted.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to an undercut demoulding structure and an injection mold using the same. Background Art

[0002] For products that require an undercut structure, existing injection molds cannot guarantee demoulding at the undercut of the product. The reason is that during demoulding, the insert pulls the product due to the undercut structure, making it impossible for the product to fall off the insert. Therefore, the product design needs to be split into two injection molded parts, which are then assembled and bonded together after injection molding. Take the undercut structure of a medical three-way Y valve as an example. Figure 1 and Figure 2 As shown, the three-way Y valve body A and the undercut part B need to be injection molded separately, and then the three-way Y valve body A and the undercut part B are assembled and fixed together by adhesive C to form the product undercut structure D. On the one hand, a separate injection mold needs to be opened for the product undercut, and on the other hand, it still needs to go through an assembly process after injection molding, which increases the production cost of the product and complicates the production process. Utility Model Content

[0003] To this end, one purpose of the present invention is to provide an undercut demoulding structure and an injection mold using the same, so as to solve the problems mentioned in the background technology and overcome the deficiencies in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A reverse demolding structure includes a slider insert, wherein the slider insert includes a first slider insert, a second slider insert and a third slider insert, wherein the second slider insert is sleeved on the outside of the third slider insert, and the first slider insert is sleeved on the outside of the second slider insert, wherein the length of the first slider insert is smaller than the length of the second slider insert, and an reverse groove is provided on the outer surface of the second slider insert, wherein the reverse groove forms an annular groove around the second slider insert.

[0006] Furthermore, the first slider insert includes a first front end portion, a first connecting portion and a first rear end portion connected in sequence, the first front end portion is truncated cone-shaped, the first connecting portion is cylindrical, the first rear end portion is provided with a first boss and a second boss, and a first groove is formed between the first boss and the second boss.

[0007] Furthermore, the second slider insert includes a second front end portion, a second connecting portion and a second rear end portion which are connected in sequence, the inverted groove is arranged on the outer surface of the second front end portion, the second rear end portion is specifically a first clamping block, and the first clamping block is provided with a clamping groove.

[0008] Furthermore, the third slider insert includes a third front end portion, a third connecting portion and a third rear end portion which are connected in sequence, the third front end portion and the third connecting portion are both cylindrical, the outer diameter of the third front end portion is smaller than the outer diameter of the third connecting portion, and the third rear end portion is specifically a second clamping block, which can be just embedded in the clamping slot.

[0009] Furthermore, it also includes a male mold core-pulling insert, one end of which is provided with a third clamping block, and the other end of the male mold core-pulling insert is in contact with the injection molded product.

[0010] Furthermore, the second slider insert is integral with the third slider insert.

[0011] The utility model also provides an injection mold, including the above-mentioned inverted demolding structure, and also including a male mold core and a female mold core, the male mold core is provided with a male mold insert, the female mold core is provided with a female mold insert, and the male mold core insert passes through the male mold core and contacts with the injection molded product.

[0012] Therefore, the utility model has the following beneficial effects:

[0013] The utility model provides an undercut demoulding structure and an injection mold using the same. The inserts used to form the undercut structure are designed as a split structure, that is, the slider inserts include a first slider insert, a second slider insert and a third slider insert. When the mold is demoulded after injection molding, the slider inserts are withdrawn from the product in batches. When the second and third slider inserts are withdrawn from the product, the first slider insert restricts and fixes the product, so that the second and third slider inserts can be withdrawn smoothly without being unable to detach the product due to the undercut structure. The injection molded part does not need to be split into two products, and there is no need to open another set of injection molds for the undercut of the product, which eliminates the post-assembly process of the undercut of the product.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 It is a schematic diagram of a medical three-way Y-valve structural component in the prior art;

[0017] Figure 2 It is a partial cross-sectional view of a medical three-way Y valve after assembly in the prior art;

[0018] Figure 3It is a schematic diagram of the overall structure of the slider insert of the embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the first slider insert of an embodiment of the utility model;

[0020] Figure 5 It is a schematic diagram of the structure of the second slider insert of the embodiment of the utility model;

[0021] Figure 6 It is a schematic diagram of the structure of the third slider insert of the embodiment of the utility model;

[0022] Figure 7 This is a schematic diagram of the overall structure of a slider insert with an injection molded product according to an embodiment of the utility model;

[0023] Figure 8 is a cross-sectional view of a product formed by injection molding of the utility model;

[0024] Fig. 9 This is a schematic diagram of the demoulding process of the mold core part of the embodiment of the utility model Figure 1 ;

[0025] Fig.10 This is a schematic diagram of the demoulding process of the mold core part of the embodiment of the utility model Figure 2 ;

[0026] Fig.11 This is a schematic diagram of the demoulding process of the mold core part of the embodiment of the utility model Figure 3 ;

[0027] Fig.12 This is a schematic diagram of the demoulding process of the mold core part of the embodiment of the utility model Figure 4 ;

[0028] Fig.13 This is a schematic diagram of the demoulding process of the mold core part of the embodiment of the utility model Figure 5 ;

[0029] Fig.14 This is a schematic diagram of the demoulding process of the overall mold of the embodiment of the utility model Figure 1 ;

[0030] Fig.15 This is a schematic diagram of the demoulding process of the overall mold of the embodiment of the utility model Figure 2 ;

[0031] Fig.16 This is a schematic diagram of the demoulding process of the overall mold of the embodiment of the utility model Figure 3 ;

[0032] Fig.17 This is a schematic diagram of the demoulding process of the overall mold of the embodiment of the utility model Figure 4 .

[0033] In the figure: A: three-way Y valve body; B: undercut; C, adhesive; D, undercut structure; 1, female mold core; 2, female mold insert; 3, injection molded product; 4, first slider insert; 41, first front end; 42, first connecting portion; 43, first rear end; 44, first boss; 45, second boss; 46, first groove; 5, second slider insert; 51, second front end; 52, second connecting portion; 53, second rear end; 54, slot; 55, undercut; 6, third slider insert; 61, third front end; 62, third connecting portion; 63, third rear end; 7, male mold insert; 8, male mold core; 9, male mold core insert; 91, third clamping block. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] An undercut demoulding structure, such as Figure 3-Figure 13 As shown, it includes a slider insert, which includes a first slider insert 4, a second slider insert 5 and a third slider insert 6. The second slider insert 5 is sleeved on the outside of the third slider insert 6, and the first slider insert 4 is sleeved on the outside of the second slider insert 5. The length of the first slider insert 4 is smaller than the length of the second slider insert 5. The outer surface of the second slider insert 5 is provided with a reverse groove 55, and the reverse groove 55 forms an annular groove around the second slider insert 5.

[0037] The utility model designs the insert used for forming the undercut structure into a split structure, that is, the slider insert includes a first slider insert 4, a second slider insert 5 and a third slider insert 6. When the mold is demolded after injection molding, the slider inserts are withdrawn from the product in batches. When the second slider insert 5 and the third slider insert 6 are withdrawn from the product, the first slider insert 4 restricts and fixes the product, so that the second slider insert 5 and the third slider insert 6 can be withdrawn smoothly without causing the product to be unable to detach due to the undercut structure.

[0038] As an implementation manner, the length of the first slider insert 4 is shorter than the length of the second slider insert 5 , and the length of the second slider insert 5 is shorter than the length of the third slider insert 6 .

[0039] As an implementation manner, the length of the first slider insert 4 is less than the length of the second slider insert 5 , and the length of the second slider insert 5 is equal to the length of the third slider insert 6 .

[0040] As an implementation manner, the length of the first slider insert 4 is shorter than the length of the second slider insert 5 , and the length of the second slider insert 5 is longer than the length of the third slider insert 6 .

[0041] That is to say, the length relationship between the first slider insert 4, the second slider insert 5 and the third slider insert 6 is not fixed and can be selectively designed according to the specific structure of the product to be injection molded. As long as the slider inserts can be withdrawn from the product in batches without causing the product to be unable to detach due to the undercut structure, the length relationship between the first slider insert 4, the second slider insert 5 and the third slider insert 6 is within the protection scope of the present utility model.

[0042] like Figure 4 As shown, the first slider insert 4 includes a first front end portion 41, a first connecting portion 42 and a first rear end portion 43 which are connected in sequence. The first front end portion 41 is truncated cone-shaped, the first connecting portion 42 is cylindrical, and the first rear end portion 43 is provided with a first boss 44 and a second boss 45. A first groove 46 is formed between the first boss 44 and the second boss 45.

[0043] Specifically, the cross-sectional diameter of the bottom end (the end connected to the first connecting portion 42 ) of the truncated cone-shaped first front end portion 41 is equal to the cross-sectional diameter of the first connecting portion 42 .

[0044] The first groove 46 formed between the first boss 44 and the second boss 45 can play a role of limiting and driving in the process of opening and closing the mold during the injection molding of the mold.

[0045] like Figure 5 As shown, the second slider insert 5 includes a second front end portion 51, a second connecting portion 52 and a second rear end portion 53 connected in sequence, a groove 55 is provided on the outer surface of the second front end portion 51, and the second rear end portion 53 is specifically a first clamping block, and a clamping groove 54 is provided on the first clamping block.

[0046] The undercut 55 is used to form an undercut structure on the inner surface of the product during injection molding. The second rear end 53, i.e., the first clamping block, plays a role of limiting and driving during the opening and closing process of the mold during injection molding.

[0047] like Figure 6As shown, the third slider insert 6 includes a third front end portion 61, a third connecting portion 62 and a third rear end portion 63 which are connected in sequence. The third front end portion 61 and the third connecting portion 62 are both cylindrical. The outer diameter of the third front end portion 61 is smaller than the outer diameter of the third connecting portion 62. The third rear end portion 63 is specifically a second clamping block which can be just embedded in the clamping groove 54.

[0048] During the opening and closing process of the mold during injection molding, the third rear end portion 63, namely the second clamping block, plays a role of limiting and driving.

[0049] As an implementation manner, the shape of the card slot 54 is circular, the shape of the second card block is cylindrical, the inner diameter of the card slot 54 is equal to the outer diameter of the second card block, and the second card block can be just embedded in the card slot 54.

[0050] As an implementation manner, the shape of the card slot 54 is semicircular, the shape of the second card block is semi-cylindrical, the inner diameter of the card slot 54 is slightly larger than the outer diameter of the second card block, and the second card block can be embedded in the card slot 54.

[0051] As an implementation manner, the shape of the card slot 54 is square, the shape of the second card block is cube-shaped, the diagonal length of the card slot 54 is equal to the diagonal length of the second card block, and the second card block can be just embedded in the card slot 54.

[0052] That is to say, the utility model does not impose any specific restrictions on the shapes of the card slot 54 and the second card block (the third rear end portion 63). The shapes of the card slot 54 and the second card block (the third rear end portion 63) can be selectively set according to actual needs and mold design requirements. As long as the shapes and sizes of the card slot 54 and the second card block (the third rear end portion 63) can enable the second card block to be embedded in the card slot 54, they are within the protection scope of the utility model.

[0053] like Fig. 9 As shown, it also includes a male mold core-pulling insert 9, one end of which is provided with a third clamping block 91, and the other end of the male mold core-pulling insert 9 is in contact with the injection molded product 3.

[0054] As an implementation manner, the second slider insert 5 and the third slider insert 6 may be integrated.

[0055] As an implementation manner, the second slider insert 5 and the third slider insert 6 may not be integrated but may be separate.

[0056] The utility model also provides an injection mold, including the above-mentioned inverted demolding structure, and also includes a male mold core 8 and a female mold core 1, the male mold core 8 is provided with a male mold insert 7, the female mold core 1 is provided with a female mold insert 2, and the male mold core insert 9 penetrates the male mold core 8 and contacts the injection molded product 3.

[0057] Injection molding completed state Fig. 9 As shown, after the injection molding is completed, the male mold core-pulling insert 9 is pulled out downward. After the male mold core-pulling insert 9 is pulled out, the undercut structure of the injection molded product 3 is no longer pressed by the male mold core-pulling insert 9, so that the undercut structure of the injection molded product 3 can have a certain slight deformation when subjected to force, such as Fig.10 Next, the mold core is opened, and the female mold core 1 and the female mold insert 2 are separated from the male mold insert 7 and the male mold core 8, as shown. Fig.11 As shown. At this time, the second slider insert 5 and the third slider insert 6 are pulled out to the right, and the first slider insert 4 remains in its original position. This is to prevent the second slider insert 5 and the third slider insert 6 from moving the injection molded product 3 when demolding. Although the undercut structure of the product is still embedded in the undercut groove 55 of the second slider insert 5, one end of the first slider insert 4 supports the injection molded product 3, and the undercut structure of the injection molded product 3 is no longer pressed by the male mold core-pulling insert 9. When the second slider insert 5 and the third slider insert 6 are demolded, the undercut structure of the injection molded product 3 can undergo a certain slight deformation under the condition of being subjected to force, so that the second slider insert 5 and the third slider insert 6 can be smoothly separated from the product, preventing the product from sticking to the second slider insert 5 and the third slider insert 6, causing the product to be deformed or unable to be demolded, and completing the demolding of the product undercut, as shown. Fig.12 After the undercut of the injection molded product 3 is completely removed, the first slider insert 4, the second slider insert 5 and the third slider insert 6 are removed from the product to the right together. Fig.13 As shown, at this time, all the mold opening and demoulding actions have been completed, and the injection molded product 3 can be ejected.

[0058] like Figure 7 and Figure 8 As shown, the product molded by the structure of the utility model has an undercut structure D, and the injection molded product 3 is integrated and can be realized by only one set of molds. There is no need for assembly and bonding after injection molding, which simplifies the production process and reduces the production cost of the product.

[0059] The utility model provides an injection mold, which, in addition to the above structure, also includes a female mold fixing plate, a female mold plate, a male mold plate, a mold foot, a male mold fixing plate, a water pipe, a guide sleeve and other structures, which together with the above structure of the utility model can form a complete mold, such as Figure 14-17 As shown, however, since they are all existing structures and are very mature and common structures in molds, the utility model will not describe them in detail.

[0060] Fig.14 The overall mold demoulding process schematic diagram corresponds to Fig. 9 The demoulding process of the mold core part, Fig.15 The overall mold demoulding process schematic diagram corresponds to Fig.10 The demoulding process of the mold core part, Fig.16 The overall mold demoulding process schematic diagram corresponds to Fig.11 and Fig.12 The demoulding process of the mold core part, Fig.17 The overall mold demoulding process schematic diagram corresponds to Fig.13 The difference between the demoulding process of the core part and the Figure 9-13 The demoulding process of the core is shown. Figure 14-17 The mold opening and demoulding process is displayed based on the overall mold.

[0061] The utility model provides an undercut demoulding structure and an injection mold using the same, which can realize that an injection molded part does not need to be split into two products, does not need to open another set of injection molds for the undercut part of the product, and cancels the post-assembly process of the undercut part of the product.

[0062] 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. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] It is not difficult for those skilled in the art to understand that the utility model includes any combination of the utility model content and the specific implementation method part of the above specification and the various parts shown in the drawings. Due to the limited space and to make the specification concise, the various schemes composed of these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0064] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An undercut demoulding structure, It is characterized in that It includes a slider insert, which includes a first slider insert, a second slider insert and a third slider insert, the second slider insert is sleeved on the outside of the third slider insert, the first slider insert is sleeved on the outside of the second slider insert, the length of the first slider insert is smaller than the length of the second slider insert, and the outer surface of the second slider insert is provided with a reverse groove, and the reverse groove forms an annular groove around the second slider insert.

2. The undercut demoulding structure according to claim 1, It is characterized in that The first slider insert includes a first front end portion, a first connecting portion and a first rear end portion which are connected in sequence, the first front end portion is truncated cone-shaped, the first connecting portion is cylindrical, the first rear end portion is provided with a first boss and a second boss, and a first groove is formed between the first boss and the second boss.

3. The undercut demoulding structure according to claim 1, It is characterized in that The second slider insert includes a second front end portion, a second connecting portion and a second rear end portion which are connected in sequence, the inverted groove is arranged on the outer surface of the second front end portion, the second rear end portion is specifically a first clamping block, and the first clamping block is provided with a clamping groove.

4. The undercut demoulding structure according to claim 3, It is characterized in that The third slider insert includes a third front end portion, a third connecting portion and a third rear end portion which are connected in sequence. The third front end portion and the third connecting portion are both cylindrical. The outer diameter of the third front end portion is smaller than the outer diameter of the third connecting portion. The third rear end portion is specifically a second clamping block, which can be just embedded in the clamping slot.

5. An undercut demoulding structure according to any one of claims 1 to 4, It is characterized in that It also includes a male mold core-pulling insert, one end of which is provided with a third clamping block, and the other end of which is in contact with the injection molded product.

6. The undercut demoulding structure according to claim 1, It is characterized in that The second slider insert is integral with the third slider insert.

7. An injection mold, comprising an undercut demoulding structure according to any one of claims 1 to 6, It is characterized in that It also includes a male mold core and a female mold core. The male mold core is provided with a male mold insert, the female mold core is provided with a female mold insert, and the male mold core insert penetrates the male mold core and contacts the injection molded product.

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