Backoff mold ejection structure and product production mold

Abstract

The utility model provides a back-off mold ejection structure and a product production mold. The back-off mold ejection structure comprises a male mold plate, a male mold core, an ejector pin, a movable insert, a pressing plate and a return structure, an accommodating space is formed in the bottom of the core insert; the back-off mold ejection structure has a first state, a second state and a third state; when the first state is switched to the second state, the ejector pin moves upwards to drive the back-off product to move upwards, and at the moment, the movable insert moves upwards together; when the second state is switched to the third state, the ejector pin continues to move upwards, the movable insert cannot continue to move upwards due to the fact that the pressing plate is limited by the containing space, and the ejector pin ejects the back-off product away from the movable insert; according to the utility model, the thought of the movable insert is adopted, and the connection relationship between the ejector pin movable insert and the back-off product is utilized, so that the separation of the back-off product and the lower mold can be completed by driving the ejector pin only by one set of driving assembly, the mold structure is simplified, and mold parts are relatively reduced.

Description

Technical Field

[0001] The utility model relates to the field of material processing, in particular to an undercut mold ejection structure and a product production mold. Background Art

[0002] In plastic molds, the material used is usually ABS, and the products made by the molds have different shapes. For example, there are products with undercuts in the demoulding direction. The sizes of such products are also various. For example, the size of the C-type buckle is ~1.5~2.5mm, and the undercut amount is 0.15mm.

[0003] There are currently two ways to demould this type of C-shaped undercut product from the lower mold:

[0004] 1) Use secondary ejection to leave deformation space, and the product is ejected and forced to be released. The technical disadvantages of this solution are complex structural movements and high maintenance risks during production.

[0005] Figures 8 to 9 It is one of the commonly used secondary ejection solutions. Its principle and ejection process are as follows: The ejection method uses a buckle base structure, and the machine ejector is connected to the mold ejector. The product is ejected safely twice. The first time is to eject the product upside down to a deformable position, and the spring and ejector are ejected at the same time (the ejector plate controls the ejection speed). The second time, the ejector is used to separate the product, and the mold returns to its original position by pulling it back with the ejector plate.

[0006] Fig.10 and Fig.11 It is the second most commonly used secondary ejection solution. Its principle and ejection process are as follows: The ejection method uses a buckle base structure, and the machine ejector rod is connected to the mold ejector rod to safely eject the product twice. The first time is to eject the product upside down to a deformable position, and the second time is to use an ejector pin to separate the product.

[0007] However, the current secondary ejection solutions require two complete and independent ejection structures to separate the undercut product from the mold, that is, two independent drive components (including Fig.10 The independent upper ejector plate, the independent lower ejector plate and the driving device for driving the ejector plate to move are shown in the figure. One set of driving components independently controls the machine ejector rod, and the other set of driving components independently controls the ejector. The overall solution has the defects of equipment redundancy and complex structure.

[0008] 2) Use the deformation space left after the slide is opened to eject the product. The disadvantage of this technology is that the slide occupies too much mold space, reduces the number of mold cavities, and has low production efficiency. Utility Model Content

[0009] In view of the defects in the prior art, the purpose of the utility model is to provide an undercut mold ejection structure and a product production mold.

[0010] According to the utility model, an undercut mold ejection structure is provided, comprising a male mold plate, a male mold core, an ejector pin, a movable insert, a pressure plate and a return structure;

[0011] The male mold core is installed on the male mold plate, and a receiving space is provided at the bottom of the male mold core. The pressing plate is installed in the receiving space and can slide up and down in the receiving space.

[0012] The movable insert is sleeved on the outside of the ejector pin, the bottom end of the movable insert is connected to the pressing plate, and the top end of the movable insert matches the shape of the undercut product;

[0013] The undercut mold ejection structure has a first state, a second state and a third state;

[0014] When in the first state, the inverted product is inverted on the movable insert, the male mold core is in contact with the inverted product, and the pressing plate is located at the bottom end of the accommodating space;

[0015] When in the second state, the ejector pin moves upward, the inverted product is separated from the male mold core, and the inverted product is still inverted on the movable insert; the pressing plate is located at the top of the accommodating space.

[0016] When in the third state, the ejector pin continues to move upward to push the undercut product away from the movable insert.

[0017] The return structure is used to return the movable insert from the position in the third state to the position in the first state after the inverted product is taken out.

[0018] Preferably, the return structure comprises a return pin, the bottom end of the return pin is connected to the pressure plate, and the top end of the return pin is higher than the top end of the movable insert.

[0019] Preferably, it further comprises a spring, the top of the spring is connected to the pressure plate, and the bottom of the spring is connected to the male template.

[0020] Preferably, the undercut product is a C-shaped elastic undercut product.

[0021] Preferably, it further comprises a fastener, and the pressing plate is connected to the male mold core via the fastener.

[0022] Preferably, the fastener is a screw.

[0023] Preferably, it also includes an upper ejector plate and a lower ejector plate;

[0024] The bottom end of the ejector pin is mounted on the upper ejector pin plate;

[0025] The upper ejector plate is fixed on the lower ejector plate, and the lower ejector plate is driven by an external driving device to achieve up and down movement.

[0026] Preferably, it further comprises a lower fixing plate, and the lower ejector plate is mounted on the lower fixing plate.

[0027] Preferably, one lower fixing plate corresponds to a plurality of pressing plates, and one pressing plate corresponds to a plurality of ejector pins.

[0028] A product production mold provided by the utility model adopts the inverted mold ejection structure.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] The utility model adopts the idea of ​​movable inserts, and utilizes the connection relationship between the ejector movable insert and the undercut product, so that only one set of driving components is needed to drive the ejector to complete the separation of the undercut product from the lower mold, thus simplifying the mold structure and reducing the number of mold parts. In addition, the utility model does not adopt the design idea of ​​changing the row position, which will not increase the occupied space of the row position, and can design more mold cavities, without reducing the production efficiency due to the reduction in the number of cavities. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0032] Figure 1 It is a structural schematic diagram of the utility model;

[0033] Figure 2 for Figure 1 The enlarged diagram of the structure at A in the middle;

[0034] Figure 3 It is a schematic diagram of the workflow of the utility model;

[0035] Figure 4 It is a structural schematic diagram of an undercut product;

[0036] Figure 5 It is a structural schematic diagram of a lower fixed plate corresponding to multiple pressing plates;

[0037] Figure 6 It is a schematic diagram of the structure in which one pressing plate corresponds to multiple undercut pins;

[0038] Figure 7 It is a partial exploded view of the utility model;

[0039] Figure 8 This is a structural diagram of one of the secondary ejection solutions;

[0040] Fig. 9 for Figure 8 A partial schematic diagram of

[0041] Fig.10 This is the structural diagram of the second secondary ejection solution;

[0042] Fig.11 for Fig.10 A partial schematic diagram of .

[0043] The figure shows:

[0044]

[0045] DETAILED DESCRIPTION

[0046] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0047] The utility model provides an undercut mold ejection structure, comprising a male mold plate 1, a male mold core 2, an ejector pin 4, a movable insert 5, a pressing plate 6 and a return structure; the male mold core 2 is installed on the male mold plate 1, a receiving space is provided at the bottom of the male mold core 2, the pressing plate 6 is installed in the receiving space, and can slide up and down in the receiving space;

[0048] The movable insert 5 is sleeved on the outside of the ejector pin 4, the bottom end of the movable insert 5 is connected to the pressing plate 6, and the top end of the movable insert 5 matches the shape of the undercut product 20;

[0049] like Figure 3 As shown, the undercut mold ejection structure has a first state, a second state and a third state; when in the first state, the undercut product 20 is undercut on the movable insert 5, and the male mold core 2 is in contact with the undercut product 20, and the pressing plate 6 is located at the bottom end of the accommodating space; when in the second state, the ejector pin 4 moves upward, the undercut product 20 is separated from the male mold core 2, the undercut product 20 is still undercut on the movable insert 5, and the pressing plate 6 is located at the top end of the accommodating space; specifically, when switching from the first state to the second state, the ejector pin 4 moves upward, driving the undercut product 20 to move upward, the undercut product 20 hooks the movable insert 5 to make the movable insert 5 move upward, and the bottom end of the movable insert 5 drives the pressing plate 6 to move to the top end of the accommodating space; the undercut product 20 leaves the male mold core 2;

[0050] When in the third state, the ejector pin 4 continues to move upward to push the undercut product 20 away from the movable insert 5. Specifically, when switching from the second state to the third state, the ejector pin 4 continues to move upward, and the movable insert 5 cannot continue to move upward because the pressure plate 6 is limited by the accommodation space, and the ejector pin 4 pushes the undercut product 20 away from the movable insert 5; the return structure is used to return the movable insert 5 from the position in the third state to the position in the first state after the undercut product 20 is taken out. In a preferred example, the undercut product 20 is a C-type elastic undercut product 20, such as a C-type plastic undercut product 20.

[0051] That is to say, the ejection action of the present invention can be understood as: utilizing the product undercut structure to bring the insert 5 out to a position with deformation space, i.e., a position where the undercut product 20 is separated from the male mold core 2, and then continuing to eject the ejector pin 4, so that the undercut product 20 is slightly deformed, thereby separating from the insert 5.

[0052] The return structure includes a return pin 3, the bottom end of which is connected to the pressing plate 6. The top end of the return pin 3 is higher than the top end of the movable insert 5.

[0053] The undercut mold ejection structure also includes a spring 8 and a fastener. The top of the spring 8 is connected to the pressure plate 6, and the bottom of the spring 8 is connected to the male mold plate 1. The pressure plate 6 is connected to the male mold core 2 through the fastener; specifically, the fastener is used to fix the position of the pressure plate 6 in the four directions of front, back, left, and right, without limiting the movement of the pressure plate 6 in the up and down directions. In a preferred example, the fastener is a screw 7 or a bare screw.

[0054] The undercut mold ejection structure also includes an upper ejector plate 9, a lower ejector plate 10 and a lower fixed plate 11; the bottom end of the ejector 4 is mounted on the upper ejector plate 9; the upper ejector plate 9 is fixed on the lower ejector plate 10, and the lower ejector plate 10 is driven by an external driving device to achieve up and down movement. The lower fixed plate 11, the lower ejector plate 10 is mounted on the lower fixed plate 11.

[0055] In a preferred embodiment, Figure 5 and Figure 6 As shown, one lower fixing plate 11 corresponds to a plurality of pressing plates 6 , and one pressing plate 6 corresponds to a plurality of ejector pins 4 .

[0056] In a preferred example, the ejection structure of the undercut mold is a lower mold, and the lower mold cooperates with the upper mold to manufacture the undercut product 20. The working principle and process of the return structure of the utility model are as follows: the return is to use the return pin 3 to push the pressure plate 6 to reset the movable insert 5. Specifically, after the undercut product 20 is taken out, the ejector pin 4 is first driven by the lower ejector plate 10 to move downward and return to the height of the ejector pin 4 in the first state, and then the upper mold moves downward to complete the mold closing action. The return pin 3 moves downward under the drive of the upper mold to drive the pressure plate 6 to move downward to the bottom of the accommodating space. At this time, the movable insert 5 is driven by the pressure plate 6 to return to the position of the movable insert 5 in the first state, and the spring 8 is compressed. During this process, since the top of the return pin 3 of the utility model is designed to be higher than the top of the movable insert 5, the upper mold always touches the return pin 3 instead of the movable insert 5 when moving downward, thereby protecting the accuracy of the movable insert 5 that needs to directly contact the undercut product 20, so that the working accuracy and life of the utility model are effectively guaranteed.

[0057] The utility model adopts the idea of ​​using mold inserts as movable inserts, and utilizes the product inverted structure to bring the inserts out to the deformation space, and then continues to eject the ejector pin 4 to separate the inverted product 20 from the insert 5. It is realized that only one set of driving components is needed to drive the ejector pin 4 to complete the separation of the inverted product 20 from the lower mold, which simplifies the mold structure, relatively reduces the number of mold parts, relatively reduces the mold processing cost, and has a smaller production machine tonnage. And the return of the utility model is to use the return pin to push the pressure plate to reset the movable insert. The process is simple and easy to implement, and it can also protect the movable insert. In addition, the utility model also has the advantages of no restrictions on mold arrangement, the mold size can be relatively reduced, simplified processing, shortened ejection time and reduced cycle, better mold strength, etc.

[0058] The utility model also provides a product production mold, which adopts the inverted mold ejection structure.

[0059] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. An undercut mold ejection structure, characterized in that: It comprises a male mold plate (1), a male mold core (2), an ejector pin (4), a movable insert (5), a pressure plate (6) and a return structure; The male mold core (2) is mounted on the male mold plate (1); a receiving space is provided at the bottom of the male mold core (2); the pressing plate (6) is mounted in the receiving space and is capable of sliding up and down in the receiving space; The movable insert (5) is sleeved on the outside of the ejector pin (4), the bottom end of the movable insert (5) is connected to the pressing plate (6), and the top end of the movable insert (5) matches the shape of the undercut product (20); The undercut mold ejection structure has a first state, a second state and a third state; When in the first state, the undercut product (20) is undercut on the movable insert (5), the male mold core (2) is in contact with the undercut product (20), and the pressing plate (6) is located at the bottom end of the accommodating space; When in the second state, the ejector pin (4) moves upward, the inverted product (20) is separated from the male mold core (2), and the inverted product (20) is still inverted on the movable insert (5); the pressing plate (6) is located at the top of the accommodating space; When in the third state, the ejector pin (4) continues to move upward to push the undercut product (20) away from the movable insert (5); The return structure is used to return the movable insert (5) from the position in the third state to the position in the first state after the undercut product (20) is taken out.

2. The undercut mold ejection structure according to claim 1, characterized in that: The return structure comprises a return pin (3), the bottom end of the return pin (3) is connected to the pressure plate (6), and the top end of the return pin (3) is higher than the top end of the movable insert (5).

3. The undercut mold ejection structure according to claim 1, characterized in that: It also comprises a spring (8), the top of the spring (8) is connected to the pressure plate (6), and the bottom of the spring (8) is connected to the male template (1).

4. The undercut mold ejection structure according to claim 1, characterized in that: The undercut product (20) is a C-shaped elastic undercut product.

5. The undercut mold ejection structure according to claim 1, characterized in that: It also includes a fastener, through which the pressing plate (6) is connected to the male mold core (2).

6. The undercut mold ejection structure according to claim 5, characterized in that: The fastener is a screw (7).

7. The undercut mold ejection structure according to claim 1, characterized in that: It also includes an upper ejector plate (9) and a lower ejector plate (10); The bottom end of the ejector pin (4) is mounted on the upper ejector pin plate (9); The upper ejector plate (9) is fixed on the lower ejector plate (10), and the lower ejector plate (10) is driven by an external driving device to achieve up and down movement.

8. The undercut mold ejection structure according to claim 7, characterized in that: It also comprises a lower fixing plate (11), and the lower ejector plate (10) is mounted on the lower fixing plate (11).

9. The undercut mold ejection structure according to claim 1, characterized in that: One lower fixing plate (11) corresponds to a plurality of pressing plates (6), and one pressing plate (6) corresponds to a plurality of ejector pins (4).

10. A product production mold, characterized in that: The undercut mold ejection structure according to any one of claims 1 to 9 is adopted.

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