A multi-mold linkage undercut demolding mold structure

Abstract

This utility model discloses a multi-mold linkage undercut demolding mold structure, relating to the field of mold making. It includes a lower mold, an upper mold above the lower mold, a first mold cavity at the top of the lower mold, a mold core in the middle of the first mold cavity, a protrusion fixed to the top right side of the mold core, a second mold cavity at the bottom of the upper mold, and a vertical rod installed on the top left side of the lower mold. The top of the vertical rod abuts against a movable block. A demolding frame is slidably connected to the bottom of the first mold cavity, and an inner cavity is formed through the top of the second mold cavity, with a demolding template slidably connected within the inner cavity. In use, this multi-mold linkage undercut demolding mold structure consists of several parts combined together, with the multiple mold components working in tandem to form a complete model. During undercut demolding, both the upper and lower parts of the mold cavity can be pushed out, reducing the resistance between the molded model and the mold cavity during demolding, thereby maintaining the integrity of the model and improving the demolding quality.

Description

Technical Field

[0001] This utility model relates to the field of mold-related technology, specifically a multi-mold linkage undercut demolding mold structure. Background Technology

[0002] In the field of injection molding, undercut structures are a common product design feature, widely used in precision plastic products such as electronic housings, automotive interiors, and medical devices. These structures can achieve functions such as snap-fit ​​and sealing. By placing material in the mold cavity and applying certain pressure and heat, the material undergoes certain physical or chemical changes to obtain the desired shape and size. Then, an undercut demolding mold structure is used. However, in existing undercut demolding mold structures, the lower mold may shake when workers use vibration to assist demolding. Over time, the stability of the lower mold during use will be affected, thus affecting the molding effect of the product.

[0003] To address the aforementioned shortcomings, existing technology (Chinese patent CN222768928U, published on 2025-04-18) provides a mold structure that facilitates undercut demolding. After the product is formed, the operator activates the drive mechanism, which, through the cooperation of the lifting sleeve and the lead screw, lifts the upper mold body. At this time, the bevel gear drives the bevel gear disk to rotate, allowing the adjustment gear disk to rotate and drive the slider to move laterally through the teeth. Accordingly, while opening the upper mold body, the rectangular plate is moved so that the rectangular plate can push the formed product to assist in unloading. This solves the problem that some existing mold structures not only consume a lot of energy during use, but also that vibration-assisted product unloading can easily affect the stability of the lower mold and even affect the subsequent product forming effect.

[0004] During the demolding process described above, the modules need to be separated first, and then the undercut model is pushed out by the push plate. The unidirectional force results in greater frictional resistance between the model and the mold during demolding, which can easily leave marks on the model and affect the demolding quality. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-mold linkage undercut demolding mold structure to solve the problem mentioned in the background art that the existing undercut demolding mold structure requires separating the modules first and then pushing the undercut model out through the push plate during demolding. The unidirectional force results in large frictional resistance between the model and the mold during demolding, which easily leaves marks on the model and affects the demolding quality.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-mold linkage inverted demolding mold structure, including a lower mold, an upper mold above the lower mold, the lower mold and the upper mold being connected by an electric push rod, a first mold cavity being provided at the top of the lower mold, a mold core being provided in the middle of the first mold cavity, a protrusion being fixed on the top right side of the mold core, and a second mold cavity being provided at the bottom of the upper mold, wherein a shell is machined within the mold cavity formed by the first mold cavity and the second mold cavity.

[0007] A vertical rod is installed on the top left side of the lower mold, and the top of the vertical rod extends through to the bottom of the upper mold. The top of the vertical rod abuts against the movable block, and the movable block is slidably connected to the inner left side of the second mold cavity of the upper mold by a first spring.

[0008] A mold ejector frame is slidably connected to the bottom of the first mold cavity, and the mold ejector frame is configured as a rectangular structure.

[0009] The top of the second mold cavity is provided with an inner cavity, and an outlet template is slidably connected in the inner cavity.

[0010] Furthermore, the movable block is configured as a right-angled trapezoidal structure, with the hypotenuse of the movable block pressing against the vertical rod, and the movable block forming a horizontal sliding structure through the vertical rod and the first spring.

[0011] Furthermore, after the movable block slides, it abuts against the side wall of the second mold cavity to form a reserved space. After the lower mold and the upper mold are closed, the protrusion abuts against the top of the second mold cavity to form a reserved space. The top and sides of the shell have corresponding reserved holes after forming.

[0012] Furthermore, a positioning toothed plate is symmetrically installed in the middle of the top surface of the lower mold, and the top of the positioning toothed plate is slidably connected to the bottom of the upper mold. A gear is symmetrically rotatably connected in the middle of the inner side of the upper mold. The gear is fixedly installed on the front and rear sides of the reverse lead screw, and the reverse lead screw is rotatably connected to the inside of the cavity.

[0013] Furthermore, the reverse lead screw is symmetrically threaded with a slider, the bottom of the slider is hinged to a connecting rod, the bottom of the connecting rod is hinged to the top of the ejector plate, and the ejector plate forms an inverted demolding mechanism through the slider and the connecting rod.

[0014] Furthermore, a sliding rod is slidably connected through the middle of the positioning tooth plate, the bottom of the sliding rod extends into the interior of the lower mold, a mold ejection frame is fixed to the bottom of the sliding rod, and a second spring is installed between the bottom of the sliding rod and the lower mold.

[0015] Furthermore, the slide bar forms an elastic telescopic sliding structure through a second spring, the slide bar is configured as a "J" shape, and the ejector frame is located between the first mold cavity and the mold core.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This multi-mold linkage undercut demolding mold structure consists of several parts combined in the mold cavity. The linkage of multiple mold components forms a complete model. During undercut demolding, both the upper and lower parts of the mold cavity can be pushed out of the mold, reducing the resistance between the molded model and the mold cavity during demolding, thereby maintaining the integrity of the model and improving the demolding quality of the mold.

[0018] 1. Furthermore, after the mold is closed, the protrusion on the mold core in the first mold cavity will abut against the top of the second mold cavity. After the first and second mold cavities are closed, they form a complete molding cavity. The vertical rod will extend into the bottom of the upper mold and abut against the movable block, thereby pushing the movable block to move laterally, stretching the first spring and abutting against the side wall of the second mold cavity. The movable block and the protrusion together form the reserved space of the shell. The injection liquid enters from the injection hole at the top of the upper mold. The shell is inverted. After the shape is set and the mold is removed, a hole will be formed on the shell at the location of the movable block and the protrusion. The linkage of multiple mold components forms a complete processing cavity. The horizontally moving movable block and the protrusion form a clearance space in the second mold cavity, thereby forming the reserved hole of the shell, which facilitates the integral processing and molding of the shell and the reserved opening, improving molding efficiency and quality.

[0019] 2. Furthermore, during mold opening, the vertical rod separates from the movable block, the first spring causes the movable block to separate from the housing, and the protrusion also separates from the housing. The positioning toothed plate moves out from the inside of the upper mold, and the positioning toothed plate drives the gear to rotate. After the gear rotates, it drives the reverse screw to rotate synchronously. After the reverse screw rotates, it drives the two sliders to move relative to each other in the inner cavity. After the sliders move, they drive the connecting rod to rotate. After the connecting rod rotates, it pushes the template out of the second mold cavity and moves it down, thereby removing the top of the housing from the second mold cavity, thus reducing the wear on the housing and removing the overturned housing.

[0020] 3. Furthermore, as the positioning toothed plate separates from the upper mold, the top of the slide bar loses pressure, and the second spring drives the slide bar to move upward and reset. After the slide bar moves upward, it drives the mold frame to move upward in the first mold cavity simultaneously, thereby separating the bottom of the molded shell from the first mold cavity, thus achieving a fast and stable demolding effect. Attached Figure Description

[0021] Figure 1 This is a front view structural diagram of the overall mold-closed state of this utility model;

[0022] Figure 2 This is a schematic diagram of the overall mold-closed state of this utility model.

[0023] Figure 3 This is a schematic diagram of the upper mold, lower mold, and shell structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the upper mold, lower mold, and shell of this utility model in cross-section.

[0025] Figure 5 This is a schematic diagram of the upper mold, lower mold, and shell side section of this utility model;

[0026] Figure 6 This is a schematic diagram of the demolding mechanism of the template and demolding frame of this utility model.

[0027] In the diagram: 1. Lower mold; 2. Upper mold; 3. Electric push rod; 4. First mold cavity; 5. Mold core; 6. Protrusion; 7. Second mold cavity; 8. Vertical rod; 9. Movable block; 10. First spring; 11. Housing; 12. Positioning toothed plate; 13. Gear; 14. Reverse lead screw; 15. Inner cavity; 16. Slider; 17. Connecting rod; 18. Ejection template; 19. Slide rod; 20. Ejection frame; 21. Second spring. Detailed Implementation

[0028] 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.

[0029] Example 1: Please refer to Figures 1-2 The present invention provides the following technical solution: a multi-mold linkage inverted demolding mold structure, including a lower mold 1, an upper mold 2 above the lower mold 1, the lower mold 1 and the upper mold 2 being connected by an electric push rod 3, a first mold cavity 4 being provided at the top of the lower mold 1, a mold core 5 being provided in the middle of the first mold cavity 4, a protrusion 6 being fixed at the top right side of the mold core 5, a second mold cavity 7 being provided at the bottom of the upper mold 2, a shell 11 being machined in the mold cavity formed by the first mold cavity 4 and the second mold cavity 7, a vertical rod 8 being installed at the top left side of the lower mold 1, the top of the vertical rod 8 penetrating to the bottom of the upper mold 2, the top of the vertical rod 8 abutting against a movable block 9, and the movable block 9 being slidably connected to the inner left side of the second mold cavity 7 of the upper mold 2 by a first spring 10;

[0030] During use, the electric push rod 3 drives the upper mold 2 to move down and close with the lower mold 1. The protrusion 6 on the mold core 5 in the first mold cavity 4 will abut against the top of the second mold cavity 7. After the first mold cavity 4 and the second mold cavity 7 are closed, they form a complete molding cavity. The vertical rod 8 will extend into the bottom of the upper mold 2 and abut against the movable block 9, thereby pushing the movable block 9 to move laterally, stretching the first spring 10 and abutting against the side wall of the second mold cavity 7. The movable block 9 and the protrusion 6 together form the reserved space of the shell 11. The injection liquid enters from the injection hole at the top of the upper mold 2. The shell 11 is inverted. After molding and demolding, holes will be formed on the shell 11 at the positions of the movable block 9 and the protrusion 6.

[0031] Example 2:

[0032] Based on Embodiment 1, the active block 9 and the protrusion 6 are also disclosed. Please refer to [link / reference]. Figures 3-5 As shown, its specific structure is as follows: the movable block 9 is set as a right-angled trapezoidal structure, the hypotenuse of the movable block 9 is pressed against the vertical rod 8, the movable block 9 forms a horizontal sliding structure through the vertical rod 8 and the first spring 10, after the movable block 9 slides, it abuts against the side wall of the second mold cavity 7 to form a reserved space, after the lower mold 1 and the upper mold 2 are closed, the protrusion 6 abuts against the top of the second mold cavity 7 to form a reserved space, and the top and side of the shell 11 have corresponding reserved holes after forming.

[0033] During use, multiple mold components work together to form a complete processing cavity. The horizontally moving movable block 9 and protrusion 6 form a clearance space in the second mold cavity 7, thereby forming the reserved hole of the shell 11, which facilitates the integral processing and molding of the shell 11 and the reserved opening, improving molding efficiency and quality.

[0034] Example 3:

[0035] Based on Embodiment 2, a gear 13, a reverse lead screw 14, a slider 16, and a connecting rod 17 are also disclosed. Please refer to [link / reference needed]. Figure 2 and Figures 4-6 As shown, its specific structure is as follows: The bottom of the first mold cavity 4 is slidably connected to the mold ejector frame 20, which is set as a rectangular structure. The top surface of the lower mold 1 is symmetrically equipped with a positioning tooth plate 12. The top of the positioning tooth plate 12 is slidably connected to the bottom of the upper mold 2. The inner side of the upper mold 2 is symmetrically rotatably connected with a gear 13. The gear 13 is fixedly installed on the front and rear sides of the reverse screw 14. The reverse screw 14 is rotatably connected to the inside of the inner cavity 15. The reverse screw 14 is symmetrically threaded with a slider 16. The bottom of the slider 16 is hinged to a connecting rod 17. The bottom of the connecting rod 17 is hinged to the top of the ejector template 18. The ejector template 18 forms an undercut demolding structure through the slider 16 and the connecting rod 17.

[0036] During use, when the mold is opened, the vertical rod 8 separates from the movable block 9, the first spring 10 causes the movable block 9 to separate from the housing 11, and the protrusion 6 also separates from the housing 11. The positioning tooth plate 12 moves out from the inside of the upper mold 2, and the positioning tooth plate 12 drives the gear 13 to rotate. After the gear 13 rotates, it drives the reverse screw 14 to rotate synchronously. After the reverse screw 14 rotates, it drives the two sliders 16 to move relative to each other in the inner cavity 15. After the sliders 16 move, they drive the connecting rod 17 to rotate. After the connecting rod 17 rotates, it pushes the template 18 to move down from the second mold cavity 7, thereby removing the top of the housing 11 from the second mold cavity 7, thereby reducing the wear on the housing 11 and removing the inverted housing 11.

[0037] Example 4:

[0038] Based on Embodiment 3, a slide bar 19 and a second spring 21 are also disclosed. Please refer to [reference needed]. Figures 4-6 As shown, its specific structure is as follows: The top of the second mold cavity 7 is provided with an inner cavity 15, and the mold plate 18 is slidably connected in the inner cavity 15. The middle of the positioning tooth plate 12 is slidably connected with a slide rod 19. The bottom of the slide rod 19 extends into the interior of the lower mold 1. The bottom of the slide rod 19 is fixed with a mold frame 20. A second spring 21 is installed between the bottom of the slide rod 19 and the lower mold 1. The slide rod 19 forms an elastic telescopic sliding structure through the second spring 21. The slide rod 19 is set with a "J" shaped structure. The mold frame 20 is located between the first mold cavity 4 and the mold core 5.

[0039] During use, when the positioning tooth plate 12 separates from the upper mold 2, the top of the slide bar 19 will lose pressure, and the second spring 21 will drive the slide bar 19 to move upward and reset. After the slide bar 19 moves upward, it will drive the mold frame 20 to move upward in the first mold cavity 4, thereby separating the bottom of the molded shell 11 from the first mold cavity 4, thus achieving a fast and stable demolding effect.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-mold linkage undercut demolding mold structure, comprising a lower mold (1), an upper mold (2) above the lower mold (1), the lower mold (1) and the upper mold (2) being connected by an electric push rod (3), a first mold cavity (4) being provided at the top of the lower mold (1), a mold core (5) being provided in the middle of the first mold cavity (4), a protrusion (6) being fixed on the top right side of the mold core (5), a second mold cavity (7) being provided at the bottom of the upper mold (2), and a shell (11) being machined in the mold cavity formed by the first mold cavity (4) and the second mold cavity (7); characterized in that A vertical rod (8) is installed on the top left side of the lower mold (1). The top of the vertical rod (8) extends through to the bottom of the upper mold (2). The top of the vertical rod (8) abuts against the movable block (9). The movable block (9) is slidably connected to the inner left side of the second mold cavity (7) of the upper mold (2) by a first spring (10). The bottom of the first mold cavity (4) is slidably connected to a mold ejector frame (20), and the mold ejector frame (20) is configured as a rectangular structure; The top of the second mold cavity (7) is provided with an inner cavity (15), and an outlet mold plate (18) is slidably connected in the inner cavity (15).

2. The multi-cavity gang-linked inverted draft mold structure of claim 1, wherein: The movable block (9) is configured as a right-angled trapezoidal structure. The hypotenuse of the movable block (9) is pressed against the vertical rod (8). The movable block (9) forms a horizontal sliding structure through the vertical rod (8) and the first spring (10).

3. The multi-cavity gang-linked inverted draft mold structure of claim 2, wherein: After the movable block (9) slides, it abuts against the side wall of the second mold cavity (7) to form a reserved space. After the lower mold (1) and the upper mold (2) are closed, the protrusion (6) abuts against the top of the second mold cavity (7) to form a reserved space. The top and side of the shell (11) have corresponding reserved holes after forming.

4. The multi-cavity gang-linked inverted draft mold structure of claim 3, wherein: The lower mold (1) is symmetrically equipped with a positioning tooth plate (12) in the middle of the top surface. The top of the positioning tooth plate (12) is slidably connected to the bottom of the upper mold (2). The upper mold (2) is symmetrically rotatably connected with a gear (13) in the middle of the inner side. The gear (13) is fixedly installed on the front and rear sides of the reverse lead screw (14). The reverse lead screw (14) is rotatably connected to the inside of the inner cavity (15).

5. The multi-cavity gang-linked inverted draft mold structure of claim 4, wherein: The reverse lead screw (14) is symmetrically threaded with a slider (16), and the bottom of the slider (16) is hinged to a connecting rod (17). The bottom of the connecting rod (17) is hinged to the top of the ejector plate (18). The ejector plate (18) forms an undercut demolding structure through the slider (16) and the connecting rod (17).

6. The multi-mold linkage undercut demolding mold structure according to claim 5, characterized in that: A sliding rod (19) is slidably connected through the middle of the positioning tooth plate (12). The bottom of the sliding rod (19) extends into the interior of the lower mold (1). A mold ejection frame (20) is fixed at the bottom of the sliding rod (19). A second spring (21) is installed between the bottom of the sliding rod (19) and the lower mold (1).

7. The multi-mold linkage undercut demolding mold structure according to claim 6, characterized in that: The slide bar (19) forms an elastic telescopic sliding structure through the second spring (21). The slide bar (19) is set as a "J" shaped structure. The mold ejection frame (20) is located between the first mold cavity (4) and the mold core (5).

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