A demolding mold for injection molding of a reverse-docking plastic product

Abstract

The utility model discloses a kind of demolding mould for inverted-draft plastic product injection molding, including fixed mould and the movable mould being arranged at the top of fixed mould, the fixed mould includes lower die plate and the lower die core being embedded in the top surface of lower die plate, the movable mould includes upper die plate and the upper die core being embedded in the bottom surface of upper die plate, the lower die core and the upper die core are surrounded with the cavity of accommodating inverted-draft plastic piece, the movable setting of several first demolding components and several second demolding components is carried out in the upper die core, the first demolding component of several is distributed in the outside of inverted-draft plastic piece in circumferential shape, the second demolding component of several is distributed in the inside of inverted-draft plastic piece in circumferential shape, to when several first demolding components and several second demolding components are simultaneously separated from inverted-draft plastic piece in mould opening.The utility model can realize the quick demolding of inverted-draft plastic piece inner buckle and outer buckle by first demolding component and second demolding component, and demolding efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically a demolding mold for injection molding of inverted plastic products. Background Technology

[0002] Injection-molded or cast products typically have undercut structures on their inner sides. When using molds for production, special mold designs are required to ensure smooth demolding after injection molding or casting. Existing injection molds primarily use angled ejectors to release the undercuts, moving at an angle to detach them. However, some injection-molded products have undercuts on the top, inner or outer sides, making it impossible to eject the product using a bottom angled ejector mechanism. The common practice is to design a slider core-pulling mechanism for the corresponding undercut area. The slider first pulls the undercut out of the mold before ejecting the product. However, the movement of this slider core-pulling mechanism requires matching sliding components and a power drive mechanism (such as a hydraulic cylinder). If the product has a large number of undercuts, the number of matching sliding components and power drive mechanisms also increases, leading to a more complex mold structure, potential interference between components, and difficulties in demolding, resulting in poor demolding efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide a demolding mold for injection molding of inverted plastic products, which can realize the rapid demolding of inverted plastic parts with both inner and outer snaps, so as to solve the problems of difficult product demolding and poor demolding efficiency mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A demolding mold for injection molding of undercut plastic products includes a fixed mold and a movable mold movably disposed at the top of the fixed mold. The fixed mold includes a lower mold plate and a lower mold core embedded on the top surface of the lower mold plate. The movable mold includes an upper mold plate and an upper mold core embedded on the bottom surface of the upper mold plate. The lower mold core and the upper mold core form a cavity for accommodating the undercut plastic part. A plurality of first demolding components and a plurality of second demolding components are movably disposed within the upper mold core. The plurality of first demolding components are circumferentially distributed on the outside of the undercut plastic part, and the plurality of second demolding components are circumferentially distributed on the inside of the undercut plastic part, so that when the mold is opened, the plurality of first demolding components and the plurality of second demolding components simultaneously detach from the undercut plastic part.

[0006] Preferably, the upper mold core is provided with a first guide groove and a second guide groove that extend to its bottom surface at an incline. The second guide groove extends upward into the interior of the upper mold plate. The first guide groove and the second guide groove are arranged in a figure-eight shape.

[0007] Preferably, the first demolding component includes an outer insert and a first elastic element. The top end of the outer insert is movably disposed in the first guide groove, and the bottom end of the outer insert is horizontally movably disposed on the top surface of the lower mold core. One end of the first elastic element is connected to the top wall of the first guide groove, and the other end is connected to the top end of the outer insert.

[0008] Preferably, the outer insert extends horizontally outward from the side of the inverted plastic part to form a core-pulling section.

[0009] Preferably, a limiting groove is formed at the top of the outer insert, and the first elastic element is accommodated in the limiting groove.

[0010] Preferably, the top surface of the lower mold core is provided with a clearance groove on the outside of the undercut plastic part, the bottom end of the outer insert is movably disposed in the clearance groove, and a positioning block is installed on one side of the clearance groove.

[0011] Preferably, the side of the positioning block facing the outer insert has an inclined surface parallel to the side of the outer insert, and a gap is reserved between the inclined surface and the side of the outer insert for the outer insert to move.

[0012] Preferably, the second demolding component includes an inner insert and a second elastic member. The inner insert is movably disposed in the second guide groove, and one end of the second elastic member is connected to the top wall of the second guide groove, and the other end is connected to the top of the inner insert.

[0013] Preferably, the bottom end of the inner insert extends horizontally towards the inside of the inverted plastic part to form a side fastening part.

[0014] Preferably, the upper side of the inner insert is provided with a slot, the inner wall of the second guide groove is provided with a receiving groove, and a limiting block extending into the slot is embedded in the receiving groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by providing a number of first demolding components on the outside of the undercut plastic part and a number of second demolding components on the inside of the undercut plastic part, the inner and outer clips of the undercut plastic part can be quickly demolded at the same time as the mold is opened, resulting in high demolding efficiency; and the number of first demolding components and the number of second demolding components are all located inside the mold, which makes the mold volume smaller and the manufacturing cost lower. Attached Figure Description

[0016] Figure 1 This is a perspective view of the inverted plastic part of this utility model;

[0017] Figure 2 This is a perspective view of a demolding mold for injection molding of inverted plastic products according to this utility model;

[0018] Figure 3 This is a cross-sectional view of a demolding mold for injection molding of inverted plastic products according to the present invention;

[0019] Figure 4 This is a cross-sectional view of the present invention when the core-pulling part and the side-fastening part are simultaneously detached from the undercut plastic part.

[0020] Figure 5 This utility model Figure 4 Enlarged view of point A in the middle;

[0021] Figure 6 This is a cross-sectional view of the first and second demolding components of this utility model completely detached from the undercut plastic part.

[0022] The corresponding reference numerals in the attached drawings are as follows: 1. Undercut plastic part; 11. Outer clip; 12. Inner clip; 2. Lower mold plate; 3. Lower mold core; 31. Clearance groove; 32. Positioning block; 33. Gap; 4. Upper mold plate; 5. Upper mold core; 51. First guide groove; 52. Second guide groove; 53. Receiving groove; 54. Limiting block; 6. First demolding component; 61. Outer pull insert; 611. Limiting groove; 612. Core pulling part; 62. First elastic element; 7. Second demolding component; 71. Inner pull insert; 711. Mounting groove; 712. Side clip; 713. Slot; 72. Second elastic element. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "more than" means two or more, unless otherwise explicitly specified. In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Please see Figure 1-6 A demolding mold for injection molding of undercut plastic products includes a fixed mold and a movable mold movably disposed at the top of the fixed mold, the bottom surface of the movable mold abutting against the top surface of the fixed mold. The fixed mold includes a lower mold plate 2 and a lower mold core 3 embedded in the top surface of the lower mold plate 2. The movable mold includes an upper mold plate 4 and an upper mold core 5 embedded in the bottom surface of the upper mold plate 4. The lower mold core 3 and the upper mold core 5 form a cavity for accommodating the undercut plastic part 1. A plurality of first demolding components 6 and a plurality of second demolding components 7 are movably disposed within the upper mold core 5. The plurality of first demolding components 6 are circumferentially distributed on the outer side of the undercut plastic part 1, and the plurality of second demolding components 7 are circumferentially distributed on the inner side of the undercut plastic part 1, so that when the mold is opened, the plurality of first demolding components 6 and the plurality of second demolding components 7 simultaneously disengage from the undercut plastic part 1.

[0026] In this embodiment, please refer to Figure 1 A plurality of circumferentially distributed outer buckles 11 are formed on the outer side of the top surface of the undercut plastic part 1, and the outer buckles 11 correspond to the first demolding component 6. A plurality of circumferentially distributed inner buckles 12 are formed on the inner side of the top surface of the undercut plastic part 1, and the inner buckles 12 correspond to the second demolding component 7.

[0027] This invention achieves rapid demolding of the inner clip 12 and outer clip 11 of the undercut plastic part 1 by providing a plurality of first demolding components 6 on the outer side of the undercut plastic part 1 and a plurality of second demolding components 7 on the inner side of the undercut plastic part 1 during mold opening, resulting in high demolding efficiency; and the plurality of first demolding components 6 and the plurality of second demolding components 7 are all located inside the mold, resulting in a smaller mold volume and lower manufacturing cost.

[0028] Please see Figure 3-5 The upper mold core 5 is inclinedly provided with a first guide groove 51 and a second guide groove 52 that penetrate to its bottom surface. The second guide groove 52 penetrates upward to the interior of the upper template 4. In this embodiment, the first guide groove 51 and the second guide groove 52 are arranged in a figure-eight shape.

[0029] Please see Figure 5 The first demolding assembly 6 includes an outer pull-out insert 61 and a first elastic element 62. The top end of the outer pull-out insert 61 is movably disposed within the first guide groove 51, and the bottom end of the outer pull-out insert 61 is horizontally movably disposed on the top surface of the lower mold core 3. One end of the first elastic element 62 is connected to the top wall of the first guide groove 51, and the other end is connected to the top end of the outer pull-out insert 61. A limiting groove 611 is formed at the top end of the outer pull-out insert 61, and the first elastic element 62 is accommodated within the limiting groove 611. In this embodiment, the first elastic element 62 is a helical spring. The function of the limiting groove 611 is to allow the first elastic element 62 to extend and retract more stably, preventing the first elastic element 62 from deforming to its periphery.

[0030] The outer insert 61 extends horizontally outward from the side of the undercut plastic part 1 to form a core-pulling part 612. The core-pulling part 612, in conjunction with the upper mold core 5 and the lower mold core 3, shapes the outer snap 11 of the undercut plastic part 1. (See also...) Figure 5 When the moving mold moves upward relative to the fixed mold to open the mold, because the core-pulling part 612 is inserted into the outer buckle 11 of the undercut plastic part 1, the outer insert 61 cannot move upward with the upper template 4 at the beginning of the mold opening; however, as the upper template 4 continues to move upward, under the push of the inner wall of the first guide groove 51, the outer insert 61 moves outward on the top surface of the lower mold core 3 in the direction away from the undercut plastic part 1, until the core-pulling part 612 is completely disengaged from the outer buckle 11 of the undercut plastic part 1; during this process, the first elastic element 62 is elastically stretched; please refer to Figure 6 When the core-pulling part 612 is completely separated from the outer buckle 11, the first elastic element 62 begins to contract. Driven by the first elastic element 62, the top of the outer insert 61 slides upward into the first guide groove 51, thereby realizing the demolding of the outer buckle 11.

[0031] Please see Figure 5The lower mold core 3 has a clearance groove 31 on the top surface outside the undercut plastic part 1. The bottom end of the outer pull insert 61 is movably disposed in the clearance groove 31. A positioning block 32 is installed on one side of the clearance groove 31. The side of the positioning block 32 facing the outer pull insert 61 has an inclined surface parallel to the side of the outer pull insert 61. A gap 33 is reserved between the inclined surface and the side of the outer pull insert 61 for the outer pull insert 61 to move. The positioning block 32 serves to position the outer pull insert 61. When the outer pull insert 61 moves outward in the direction away from the undercut plastic part 1, its bottom end in the clearance groove 31 moves toward the positioning block 32. When the bottom end of the outer pull insert 61 moves to abut against the inclined surface of the positioning block 32, the core pull part 612 is just completely disengaged from the outer buckle 11.

[0032] Please see Figure 5 The second demolding assembly 7 includes an inner insert 71 and a second elastic member 72. The inner insert 71 is movably disposed within the second guide groove 52. One end of the second elastic member 72 is connected to the top wall of the second guide groove 52, and the other end is connected to the top of the inner insert 71. The top of the inner insert 71 has a mounting groove 711, and the second elastic member 72 is accommodated within the mounting groove 711. The function of the mounting groove 711 is the same as that of the limiting groove 611, and will not be described further here. In this embodiment, the second elastic member 72 is a helical spring.

[0033] The bottom end of the inner insert 71 extends horizontally towards the inside of the undercut plastic part 1 to form a side snap-fit ​​portion 712. The side snap-fit ​​portion 712, in conjunction with the upper mold core 5 and the lower mold core 3, shapes the inner snap-fit ​​12 of the undercut plastic part 1. The demolding principle is similar to that of the outer insert 61; please refer to [link to relevant documentation]. Figure 5 When the moving mold moves upward relative to the fixed mold to open the mold, because the side fastener 712 is inserted into the inner fastener 12 of the undercut plastic part 1, the inner insert 71 cannot move upward with the upper template 4 at the beginning of the mold opening; however, as the upper template 4 continues to move upward, under the push of the inner wall of the second guide groove 52, the bottom end of the inner insert 71 moves towards the center of the undercut plastic part 1 until the side fastener 712 completely disengages from the inner fastener 12 of the undercut plastic part 1; during this process, the second elastic element 72 is elastically stretched; please refer to Figure 6 When the side buckle 712 is completely disengaged from the inner buckle 12, the second elastic member 72 begins to contract. Driven by the second elastic member 72, the inner insert 71 slides upward into the second guide groove 52, thereby achieving demolding of the inner buckle 12.

[0034] Please see Figure 5The inner insert 71 has a slot 713 on its upper side, and the second guide groove 52 has a receiving groove 53 on its inner wall. A limiting block 54 extending into the slot 713 is embedded in the receiving groove 53. The limiting block 54 serves to position the inner insert 71. When the bottom of the inner insert 71 moves toward the center of the inverted plastic part 1, the top of the inner insert 71 simultaneously overcomes the elastic force of the second elastic member 72 and moves obliquely downward in the second guide groove 52. When the top wall of the slot 713 of the inner insert 71 abuts against the top surface of the limiting block 54, the side buckle 712 is completely disengaged from the outer buckle 11.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A demolding mold for injection molding of undercut plastic products, comprising a fixed mold and a movable mold movably disposed at the top of the fixed mold, wherein the fixed mold comprises a lower mold plate (2) and a lower mold core (3) embedded in the top surface of the lower mold plate (2), and the movable mold comprises an upper mold plate (4) and an upper mold core (5) embedded in the bottom surface of the upper mold plate (4), wherein the lower mold core (3) and the upper mold core (5) form a cavity for accommodating an undercut plastic part (1), characterized in that: The upper mold core (5) is movably provided with a plurality of first demolding components (6) and a plurality of second demolding components (7). The plurality of first demolding components (6) are distributed in a circumferential shape on the outside of the undercut plastic part (1), and the plurality of second demolding components (7) are distributed in a circumferential shape on the inside of the undercut plastic part (1), so that when the mold is opened, the plurality of first demolding components (6) and the plurality of second demolding components (7) simultaneously detach from the undercut plastic part (1).

2. The demolding mold for injection molding of inverted plastic products according to claim 1, characterized in that: The upper mold core (5) is provided with a first guide groove (51) and a second guide groove (52) that extend to its bottom surface. The second guide groove (52) extends upward to the interior of the upper template (4). The first guide groove (51) and the second guide groove (52) are arranged in a figure-eight shape.

3. The demolding mold for injection molding of inverted plastic products according to claim 2, characterized in that: The first demolding component (6) includes an outer insert (61) and a first elastic element (62). The top end of the outer insert (61) is movably disposed in the first guide groove (51), and the bottom end of the outer insert (61) is horizontally disposed on the top surface of the lower mold core (3). One end of the first elastic element (62) is connected to the top wall of the first guide groove (51), and the other end is connected to the top end of the outer insert (61).

4. The demolding mold for injection molding of inverted plastic products according to claim 3, characterized in that: The outer insert (61) extends horizontally to the outside of the inverted plastic part (1) to form a core-pulling part (612).

5. The demolding mold for injection molding of inverted plastic products according to claim 3, characterized in that: The top of the outer insert (61) has a limiting groove (611), and the first elastic member (62) is accommodated in the limiting groove (611).

6. The demolding mold for injection molding of inverted plastic products according to any one of claims 3-5, characterized in that: The top surface of the lower mold core (3) is provided with a relief groove (31) on the outside of the undercut plastic part (1), and the bottom end of the outer insert (61) is movably set in the relief groove (31). A positioning block (32) is installed on one side of the relief groove (31).

7. The demolding mold for injection molding of inverted plastic products according to claim 6, characterized in that: The positioning block (32) has an inclined surface on the side facing the outer insert (61) that is parallel to the side of the outer insert (61), and a gap (33) is reserved between the inclined surface and the side of the outer insert (61) for the outer insert (61) to move.

8. The demolding mold for injection molding of inverted plastic products according to claim 2, characterized in that: The second demolding component (7) includes an inner insert (71) and a second elastic member (72). The inner insert (71) is movably disposed in the second guide groove (52). One end of the second elastic member (72) is connected to the top wall of the second guide groove (52), and the other end is connected to the top of the inner insert (71).

9. The demolding mold for injection molding of inverted plastic products according to claim 8, characterized in that: The bottom end of the inner insert (71) extends horizontally toward the inside of the inverted plastic part (1) to form a side fastener (712).

10. The demolding mold for injection molding of inverted plastic products according to claim 9, characterized in that: The upper side of the inner insert (71) is provided with a slot (713), and the inner wall of the second guide groove (52) is provided with a receiving groove (53). The receiving groove (53) is provided with a limiting block (54) extending into the slot (713).

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