Composite inverted step-by-step core-pulling demolding injection mold

Abstract

The utility model discloses a composite inverted step-by-step core-pulling demolding injection mold which is used for injection molding of a product and comprises a sliding block capable of sliding along a second direction, a first sliding block insert used for molding a first inverted position of the product and a second sliding block insert used for molding a second inverted position of the product, the first sliding block insert is fixed on the sliding block, and the second sliding block insert is fixed on the sliding block. The second sliding block insert is arranged at the bottom of the first sliding block insert and is in sliding connection with the first sliding block insert, and meanwhile, a thrust spring is installed between the second sliding block insert and the sliding block; the second sliding block insert can move in the first direction under the combined action of the first sliding block insert and the thrust spring so as to be separated from the second reverse buckling position. According to the utility model, the demoulding sequence and action of reverse buckling positions in different directions are accurately coordinated, a product with a complex reverse buckling structure can be smoothly demoulded, the integral structure of the mould is simplified, and the dimensional accuracy and the appearance quality of the product are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, especially relate to a compound reverse buckle step-by-step core-pulling demolding injection mold. BACKGROUND

[0002] In the field of injection molding, reverse buckle position refers to the convex or concave structure on the product that hinders its direct demolding from the mold, which needs special core-pulling demolding mechanism to solve. For products with complex structure, especially those containing multiple reverse buckle positions in different directions, it has always been a challenging problem to achieve smooth demolding.

[0003] Traditional injection molds can usually achieve demolding through relatively simple core-pulling mechanisms when dealing with products with single-direction reverse buckle positions. However, when a product has reverse buckle positions in different directions (such as the opening and closing direction and the direction perpendicular to the opening and closing direction), the traditional mold design has the following defects. For products with multiple-direction reverse buckle positions, if multiple independent core-pulling mechanisms are used to handle reverse buckles in different directions, the mold structure will become extremely complex, increasing the difficulty of mold design and manufacturing, and significantly increasing the cost. In addition, the coordination between multiple core-pulling mechanisms is difficult, and if not properly controlled, it is easy to cause damage to the product during core-pulling, reducing the product's pass rate. In addition, if an attempt is made to use a whole-synchronous core-pulling method, due to the different requirements and timing of core-pulling actions for reverse buckles in different directions, it is difficult to ensure that all reverse buckles can be smoothly demolded during the demolding process, and uneven stress may cause product deformation or damage. Therefore, it is necessary to improve the existing technology to overcome the defects in the prior art. SUMMARY

[0004] To solve the above technical problems, the utility model provides a kind of compound reverse buckle step-by-step core-pulling demolding injection mold, and the product with multiple different directions reverse buckle position realizes complex structure smooth demolding, effectively simplifies the overall structure of mold, improves product quality.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a composite undercut step-by-step core-pulling demolding injection mold for injection molding products. The opening and closing direction of the injection mold is defined as the first direction, and the direction perpendicular to the first direction is defined as the second direction. The product has a first undercut position in the first direction and a second undercut position in the second direction. The injection mold includes a slider that can slide along the second direction, a first slider insert for forming the first undercut position, and a second slider insert for forming the second undercut position. The first slider insert is fixed on the slider, and the second slider insert is arranged at the bottom of the first slider insert and slidably connected to the first slider insert. At the same time, a thrust spring is installed between the second slider insert and the slider. In the initial stage when the slider drives the first slider insert to disengage from the first undercut position, the second slider insert can move in the first direction under the combined action of the first slider insert and the thrust spring to disengage from the second undercut position.

[0006] As a further improvement of this utility model, a limiting pin is fixed on the first slider insert along the first direction, and a waist-shaped hole is opened in the middle of the second slider insert, into which the limiting pin extends.

[0007] As a further improvement of this utility model, the injection mold also includes a rear mold, on which a rear mold core is provided, and the rear mold core is provided with a stop step. The bottom of the second slider insert is provided with a limiting step. When the second slider insert is in the mold closed state, under the elastic force of the thrust spring, the limiting step is made to abut against the stop step.

[0008] As a further improvement of this utility model, one of the first slider insert and the second slider insert is provided with a dovetail-shaped or T-shaped oblique slide groove, and the other is provided with an oblique slide table adapted to the oblique slide groove, the oblique slide table being slidably fitted into the oblique slide groove.

[0009] As a further improvement of this utility model, the ends of the first slider insert and the second slider insert that are away from the slider are both set as cones. The first slider insert has a first undercut forming surface on its cone end face, and the second slider insert has a second undercut forming surface on its cone end face.

[0010] As a further improvement of this utility model, the slider is slidably mounted on the rear mold, and side lugs are provided on both sides of the slider. Pressure blocks distributed on both sides of the slider are fixed on the rear mold. The pressure blocks slide in contact with the side lugs to restrict the slider to slide only in the second direction.

[0011] As a further improvement of this utility model, a ball screw is installed on the pressure block, and two positioning grooves are provided at intervals on the side of the slider facing the pressure block. During the sliding of the slider, the ball screw can be switched from one of the positioning grooves to the other positioning groove.

[0012] As a further improvement of this utility model, a stop post is fixed on the rear mold, the stop post being used to stop the slider to limit the movement stroke of the slider.

[0013] As a further improvement of this utility model, the injection mold also includes a front mold, the bottom of which is fixed with an inclined guide post, which is inserted into an inclined guide hole on the slider.

[0014] As a further improvement of this utility model, a shovel base is also fixed at the bottom of the front mold, a wear-resistant pressure plate is fixed on the shovel base, an inclined pressure surface is provided on the slider, and the wear-resistant pressure plate is pressed onto the inclined pressure surface.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a composite undercut step-by-step core-pulling demolding injection mold. By cleverly combining a first slider insert and a second slider insert used for molding different undercut positions, and with the second slider insert arranged at the bottom of the first slider insert and slidably connected to it, in the initial stage when the slider drives the first slider insert to disengage from the first undercut position, the second slider insert can move in the second direction under the combined action of the first slider insert and the thrust spring to disengage from the second undercut position. This step-by-step core-pulling method accurately coordinates the demolding sequence and action of undercut positions in different directions, ensuring that products with complex undercut structures can be smoothly demolded from the mold, avoiding the cumbersome design of using multiple independent and complex core-pulling mechanisms. It is particularly suitable for products with limited demolding space. This integrated structural design effectively simplifies the overall structure of the mold, reduces the design and manufacturing difficulty of the mold, thereby reducing the manufacturing cost of the mold, and can improve the dimensional accuracy and appearance quality of the product. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the composite undercut step-by-step core-pulling and demolding injection mold of this utility model in the mold-open state;

[0018] Figure 2 This is a perspective view of the rear mold portion of the composite undercut step-by-step core-pulling demolding injection mold of this utility model;

[0019] Figure 3 This utility model Figure 2 Cross-sectional view after removing the rear mold;

[0020] Figure 4 This is an exploded view of the distributed core-pulling and demolding mechanism in this utility model;

[0021] Figure 5 This is a schematic diagram of the demolding process of the distributed core-pulling demolding mechanism in this utility model;

[0022] Figure 6 This is a perspective view of the front mold portion of the composite undercut step-by-step core-pulling demolding injection mold of this utility model.

[0023] Referring to the accompanying drawings, the following explanations are provided:

[0024] 1. Product; 101. First inverted locking position; 102. Second inverted locking position; 2. Slider;

[0025] 201. Side ear platform; 202. Positioning groove; 203. Angled guide hole; 204. Angled pressure surface; 3. First slider insert; 301. Angled slide table; 302. First undercut forming surface; 4. Second slider insert; 401. Waist-shaped hole; 402. Limiting step; 403. Angled slide groove; 404. Second undercut forming surface; 5. Thrust spring; 6. Rear mold; 7. Rear mold core; 701. Stop step; 8. Pressure block; 9. Ball screw; 10. Stop post; 11. Front mold; 12. Angled guide post; 13. Shovel base; 14. Wear-resistant pressure plate; 15. Wear-resistant base plate; 16. Limiting pin. Detailed Implementation

[0026] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0029] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0031] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0032] This utility model provides a composite undercut step-by-step core-pulling demolding injection mold for injection molding product 1. The opening and closing direction of the injection mold is defined as the first direction, and the direction perpendicular to the first direction is defined as the second direction. Product 1 has a first undercut position 101 in the first direction (specifically, the positive direction of the first direction) and a second undercut position 102 in the second direction (specifically, the positive direction of the second direction).

[0033] See Figures 1 to 6 This utility model discloses a composite undercut step-by-step core-pulling demolding injection mold, which includes a step-by-step core-pulling demolding mechanism. The mechanism includes a slider 2 that can slide along a second direction, a first slider insert 3 for forming a first undercut position 101, and a second slider insert 4 for forming a second undercut position 102. The first slider insert 3 is fixed to the slider 2 and moves synchronously with it. The second slider insert 4 is arranged at the bottom of the first slider insert 3 and is slidably connected to it. A thrust spring 5 is installed between the second slider insert 4 and the slider 2, and the thrust spring 5 applies a negative elastic force in the second direction to the second slider insert 4.

[0034] like Figure 5As shown, during the demolding process, the slider 2 drives the first slider insert 3 to slide forward in the second direction. In the initial stage when the slider 2 drives the first slider insert 3 to disengage from the first undercut position 101, the second slider insert 4 can move forward in the first direction under the combined action of the first slider insert 3 and the push spring 5 to disengage from the second undercut position 102. In the subsequent process, the slider 2 drives the first slider insert 3 and the second slider insert 4 to continue to slide forward in the second direction and completely separate from the product 1.

[0035] This invention employs a unique structural design for the first undercut 101 in the first direction and the second undercut 102 in the second direction of product 1. In the initial stage when the slider 2 drives the first slider insert 3 to disengage from the first undercut 101, the second slider insert 4, under the combined action of the first slider insert 3 and the thrust spring 5, moves in the second direction to disengage from the second undercut 102. This step-by-step core-pulling method precisely coordinates the demolding sequence and actions of the undercuts in different directions, making the force on product 1 more uniform and reasonable at each undercut. This avoids uneven force distribution caused by synchronous or unreasonable core-pulling sequences, thereby effectively reducing the stress on the product during demolding. Deformation and damage during the molding process are prevented, ensuring that the product 1 with its complex undercut structure can be smoothly ejected from the mold, thus improving the dimensional accuracy and appearance quality of the product. Furthermore, by cleverly combining the first slider insert 3 and the second slider insert 4 used to form different undercut positions, with the second slider insert 4 arranged at the bottom of the first slider insert 3 and slidably connected to it, and with the help of the thrust spring 5 to achieve action coordination, the cumbersome design of using multiple independent and complex core-pulling mechanisms is avoided. This integrated structural design is particularly suitable for products 1 with limited demolding space. This integrated structural design effectively simplifies the overall structure of the mold, reduces the design and manufacturing difficulty of the mold, and thus reduces the manufacturing cost of the mold.

[0036] See Figure 3 and Figure 4 The top of the second slider insert 4 is provided with a dovetail-shaped inclined groove 403 that slopes upwards to the right, and the bottom of the first slider insert 3 is provided with an inclined slide platform 301 that matches the inclined groove 403. The inclined slide platform 301 slides within the inclined groove 403. Of course, in other embodiments of this utility model, the inclined groove 403 can also be provided on the first slider insert 3, and the inclined slide platform 301 can be provided on the second slider insert 4, achieving the same effect. In addition, the inclined groove 403 and the inclined slide platform 301 can also be T-shaped.

[0037] The composite undercut step-by-step core-pulling demolding injection mold of this utility model also includes a rear mold 6, on which a rear mold core 7 is provided, and a slider 2 is slidably installed on the rear mold 6.

[0038] Continue reading Figure 3 and Figure 4The rear mold core 7 is provided with a stop step 701, and the bottom of the second slider insert 4 is provided with a limiting step 402. When the second slider insert 4 is in the mold closed state, under the elastic force of the thrust spring 5, the limiting step 402 is pressed against the stop step 701. When the slider 2 drives the first slider insert 3 to slide in the second direction, the thrust spring 5 applies an elastic force to the second slider insert 4, so that the second slider insert 4 remains pressed against the stop step 701 of the rear mold core 7. At the same time, the second slider insert 4 moves in the first direction in the cooperation of the inclined slide groove 403 and the inclined slide table 301 to disengage the second undercut 102.

[0039] Furthermore, a limiting pin 16 is fixed on the first slider insert 3 along the first direction, and a waist-shaped hole 401 is opened in the middle of the second slider insert 4, into which the limiting pin 16 extends. In the initial stage when the slider 2 drives the first slider insert 3 to disengage from the first inverted position 101, the second slider insert 4 does not move in the second direction until the limiting pin 16 follows the first slider insert 3 to the left end of the waist-shaped hole 401. In the subsequent movement, the first slider insert 3 begins to drive the second slider insert 4 to move in the positive direction of the second direction through the limiting pin 16.

[0040] It is worth mentioning that the ends of the first slider insert 3 and the second slider insert 4 that are away from the slider 2 are both set to be tapered. The first slider insert 3 has a first undercut forming surface 302 on its tapered end face for forming the first undercut position 101 on the product 1; the second slider insert 4 has a second undercut forming surface 404 on its tapered end face for forming the second undercut position 102 on the product 1. By setting the ends of the first slider insert 3 and the second slider insert 4 that participate in injection molding to be tapered, when inserted into the rear mold core 7, the tapered surface will automatically guide the slider insert to be centered, making the fit between the two tighter and more uniform, avoiding molding problems caused by assembly deviations. At the same time, it can generate greater friction and clamping force to prevent the slider insert from shifting, ensuring that the relative position of the slider insert and the rear mold core 7 is fixed during the molding process, thereby improving the dimensional accuracy and molding quality of the product.

[0041] See Figure 2 and Figure 4 A wear-resistant base plate 15 is fixed on the rear mold 6, and the slider 2 is slidably mounted on the wear-resistant base plate 15. Side lugs 201 are provided on both sides of the slider 2, and pressure blocks 8 distributed on both sides of the slider 2 are fixed on the rear mold 6. The pressure blocks 8 slide in contact with the side lugs 201 to restrict the slider 2 to slide only in the second direction. In addition, a stop post 10 is fixed on the rear mold 6. The stop post 10 is located on the side of the slider 2 facing the second direction and is used to stop the slider 2 to limit its travel.

[0042] Each of the two pressure blocks 8 is equipped with a ball screw 9, and the slider 2 has two positioning grooves 202 spaced apart on its side facing the pressure block 8. In the mold-closed state, the ball screw 9 abuts against the right positioning groove 202; during demolding, the slider 2 slides along the positive direction of the second direction until the ball screw 9 slides from the right positioning groove 202 to the left positioning groove 202, at which point the slider 2 is stopped by the stop post 10. This invention ensures the accurate positioning of the slider 2 by having the ball screw 9 abut against the positioning groove 202.

[0043] like Figure 1 and Figure 6 As shown, the composite undercut step-by-step core-pulling demolding injection mold of this utility model also includes a front mold 11. The bottom of the front mold 11 is fixed with an inclined guide post 12, which is inserted into the inclined guide hole 203 on the slider 2. After the product 1 is injection molded and cooled, the front mold 11 and the rear mold 6 open relative to each other. The front mold 11 drives the slider 2 to slide in the positive direction of the second direction through the inclined guide post 12 for demolding.

[0044] Of course, in other embodiments of this utility model, a demolding drive device such as a hydraulic cylinder can also be installed on the rear mold 6 to drive the slider 2 to slide in the positive direction of the second direction for demolding.

[0045] Furthermore, a shovel base 13 is fixed to the bottom of the front mold 11, and a wear-resistant pressure plate 14 is fixed on the shovel base 13. The slider 2 is provided with an inclined pressure surface 204. The wear-resistant pressure plate 14 is pressed onto the inclined pressure surface 204. During the injection molding process, it provides continuous pressure to the slider 2 to prevent it from shifting.

[0046] In addition, the composite undercut step-by-step core-pulling demolding injection mold of this utility model also includes runner plates, bottom plates, ejection mechanisms, etc., which are all conventional technologies. These are not the improvements to be made in this application, so they will not be described in detail here.

[0047] Therefore, the composite undercut step-by-step core-pulling demolding injection mold of this utility model cleverly combines the first slider insert 3 and the second slider insert 4 used to form different undercut positions. The second slider insert 4 is arranged at the bottom of the first slider insert 3 and slidably connected to it. In the initial stage when the slider 2 drives the first slider insert 3 to disengage from the first undercut position 101, the second slider insert 4 can move in the second direction under the combined action of the first slider insert 3 and the thrust spring 5 to disengage from the second undercut position 102. This step-by-step core-pulling method accurately coordinates the demolding sequence and action of undercut positions in different directions, ensuring that the product 1 with a complex undercut structure can be smoothly demolded from the mold. It avoids the cumbersome design of using multiple independent and complex core-pulling mechanisms and is particularly suitable for products 1 with limited demolding space. This integrated structural design effectively simplifies the overall structure of the mold, reduces the design and manufacturing difficulty of the mold, thereby reducing the manufacturing cost of the mold and improving the dimensional accuracy and appearance quality of the product.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A composite undercut step-by-step core-pulling injection mold for injection molding a product (1), wherein the opening and closing direction of the injection mold is defined as a first direction, and the direction perpendicular to the first direction is defined as a second direction, and the product (1) has a first undercut position (101) in the first direction and a second undercut position (102) in the second direction, characterized in that: The injection mold includes a slider (2) that can slide along the second direction, a first slider insert (3) for forming the first undercut (101), and a second slider insert (4) for forming the second undercut (102). The first slider insert (3) is fixed on the slider (2), and the second slider insert (4) is arranged at the bottom of the first slider insert (3) and slidably connected to the first slider insert (3). At the same time, a thrust spring (5) is installed between the second slider insert (4) and the slider (2). In the initial stage when the slider (2) drives the first slider insert (3) to disengage from the first undercut (101), the second slider insert (4) can move in the first direction under the combined action of the first slider insert (3) and the thrust spring (5) to disengage from the second undercut (102).

2. The composite undercut step-by-step core-pulling injection mold according to claim 1, characterized in that: A limiting pin (16) is fixed on the first slider insert (3) along the first direction, and a waist-shaped hole (401) is opened in the middle of the second slider insert (4), and the limiting pin (16) extends into the waist-shaped hole (401).

3. The composite undercut step-by-step core-pulling injection mold according to claim 1, characterized in that: It also includes a rear mold (6), on which a rear mold core (7) is provided. The rear mold core (7) is provided with a stop step (701). The bottom of the second slider insert (4) is provided with a limiting step (402). When the second slider insert (4) is in the mold closed state, under the elastic force of the thrust spring (5), the limiting step (402) is made to abut against the stop step (701).

4. The composite undercut step-by-step core-pulling injection mold according to claim 1, characterized in that: One of the first slider insert (3) and the second slider insert (4) is provided with a dovetail-shaped or T-shaped oblique slide groove (403), and the other is provided with an oblique slide table (301) adapted to the oblique slide groove (403), and the oblique slide table (301) is slidably fitted in the oblique slide groove (403).

5. The composite undercut step-by-step core-pulling injection mold according to claim 1, characterized in that: The first slider insert (3) and the second slider insert (4) are each set in a conical shape at the end away from the slider (2). The first slider insert (3) has a first undercut forming surface (302) on its conical end face, and the second slider insert (4) has a second undercut forming surface (404) on its conical end face.

6. The composite undercut step-by-step core-pulling injection mold according to claim 3, characterized in that: The slider (2) is slidably mounted on the rear mold (6). Side ear platforms (201) are provided on both sides of the slider (2). Pressure blocks (8) distributed on both sides of the slider (2) are fixed on the rear mold (6). The pressure blocks (8) slide in contact with the side ear platforms (201) to restrict the slider (2) to slide only in the second direction.

7. The composite undercut step-by-step core-pulling injection mold according to claim 6, characterized in that: The pressure block (8) is equipped with a ball screw (9), and the slider (2) has two positioning grooves (202) spaced apart on the side of the pressure block (8). During the sliding of the slider (2), the ball screw (9) can be switched from one of the positioning grooves (202) to the other positioning groove (202).

8. The composite undercut step-by-step core-pulling injection mold according to claim 3, characterized in that: A stop post (10) is fixed on the rear mold (6). The stop post (10) is used to stop the slider (2) to limit the movement stroke of the slider (2).

9. The composite undercut step-by-step core-pulling injection mold according to claim 1, characterized in that: It also includes a front mold (11), the bottom of which is fixed with a slanted guide post (12), which is inserted into the slanted guide hole (203) on the slider (2).

10. The composite undercut step-by-step core-pulling injection mold according to claim 9, characterized in that: The bottom of the front mold (11) is also fixed with a shovel base (13), and a wear-resistant pressure plate (14) is fixed on the shovel base (13). The slider (2) is provided with an inclined pressure surface (204), and the wear-resistant pressure plate (14) is pressed onto the inclined pressure surface (204).

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