A mold for inner undercut demolding

Abstract

The utility model relates to injection molding equipment demolding technical field, especially to a kind of mould for inner undercut demolding, including nozzle plate, fixed mould structure and decoupling mechanism, nozzle plate is set in the top of fixed mould structure and can be lifted along vertical direction, the inner cavity of the inner mould insert for the inner cavity of the shaped product is equipped in fixed mould structure lower part, the inner cavity of the inner mould insert is slidably matched with the sliding slot of the inner cavity along horizontal direction, the decoupling mechanism includes pusher, power component and sliding block, the first end of sliding block is equipped with the protruding portion for the undercut recess on the inner cavity wall of the shaped product, pusher is vertically slidably arranged in the inner cavity of the inner mould insert, pusher and sliding block are drivingly connected, power component is arranged between pusher and nozzle plate, and power component is used to drive pusher to push sliding block to slide along sliding slot so that it is separated from undercut recess.

Description

Technical Field

[0001] This utility model relates to the field of injection mold demolding technology, specifically to a mold for internal undercut demolding. Background Technology

[0002] Currently, a novel injection mold disclosed in an existing patent (application number: 202422418484.3) allows for demolding by inverting the inner side of the product. During use, the upper mold moves up along the mold opening direction, and the upper mold drives the mutually fixed inclined guide pillars to move up synchronously. Since the inclined part of the inclined guide pillar is fitted with the extension plate, and the extension plate only slides horizontally along the inner side of the step, the inclined guide pillar guides the extension plate and the slider to slide horizontally towards the outer opening of the step during the upward movement, thereby causing the slider to drive the pull block to detach from the inverted part of the product to complete the demolding operation.

[0003] However, this type of mold, where the slider moves along the outer side of the product to detach from it, is only suitable for demolding undercut grooves on the outer wall of the product. If the undercut groove is formed on the inner cavity sidewall of the product, the sliding direction of the slider cannot perform the disengagement action, making it unsuitable for demolding injection molded products with internal undercut grooves. Utility Model Content

[0004] In view of this, the present invention provides a mold for demolding with an internal undercut, which aims to solve the technical problem that existing molds cannot be used for demolding injection molded products with internal undercut grooves.

[0005] To solve the above-mentioned technical problems, this utility model provides a mold for internal undercut demolding, including a sprue plate, a fixed mold structure, and a demolding mechanism. The sprue plate is disposed above the fixed mold structure and can be raised and lowered vertically. The lower part of the fixed mold structure is provided with an inner mold insert for forming the inner cavity of the product. The inner mold insert has a hollow structure, and a groove is formed through the inner cavity of the inner mold insert in the horizontal direction. The mold also includes a demolding mechanism, which includes a pusher, a power component, and a slider. The slider is slidably adapted to the groove. The first end of the slider is provided with a protrusion, which is used to form the undercut groove on the inner wall of the product. The pusher is slidably disposed vertically in the inner cavity of the inner mold insert. The pusher is drivenly connected to the slider. The power component is disposed between the pusher and the sprue plate. The power component is used to drive the pusher to push the slider to slide along the groove, so that the protrusion can disengage from the undercut groove.

[0006] Furthermore, an inclined guide portion is provided on the lower side wall of the pusher corresponding to the slider. The inclined guide portion is inclined from top to bottom in a direction away from the undercut groove. A guide groove is provided at the second end of the slider. The guide groove is slidably engaged with the inclined guide portion. The power component is used to drive the pusher to move the slider away from the undercut groove when the sprue plate rises.

[0007] The power component includes an ejector pin and an elastic element. The ejector pin is located on the upper part of the pusher, and the elastic element is located between the ejector pin and the pusher. The sprue plate and the fixed mold structure are in a fitted state. The upper end of the ejector pin abuts against the lower part of the sprue plate, and the elastic element is in a compressed state. When the sprue plate separates from the fixed mold structure and rises, the elastic element rebounds to drive the pusher to rise.

[0008] Furthermore, the power component also includes a pressure plate, which is fixed to the upper end of the pusher, the ejector pin is fixed to the upper wall of the pressure plate, and the elastic element is disposed between the pressure plate and the fixed mold structure.

[0009] Furthermore, the inclined guide is a dovetail slide rail, and the second end of the slider is provided with a dovetail groove that is adapted to slide with the dovetail slide rail.

[0010] Furthermore, the fixed mold structure includes an A plate and a front mold, the front mold being detachably disposed on the lower wall of the A plate, and the inner mold insert being disposed at the lower part of the front mold.

[0011] Furthermore, the front mold and the inner mold insert are detachably connected.

[0012] Furthermore, the front mold has a vertically penetrating mounting groove inside, the upper part of the inner mold insert has a mounting post, the mounting post is inserted into the mounting groove, the two inner side walls of the mounting groove have limit grooves, and the two side walls of the mounting post and corresponding to the position of the limit groove have extension posts, the extension posts are embedded in the limit groove.

[0013] Furthermore, the pressure plate is detachably connected to the pusher.

[0014] Furthermore, the upper end of the mounting column is provided with a threaded hole along the vertical direction, and the center of the pressure plate is provided with a through hole along the vertical direction. A threaded locking element is inserted through the through hole, and the threaded locking element is threadedly connected to the mounting column.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In use, when the mold is in the closed state, the protrusion at the first end of the slider is inserted into the undercut groove. After injection molding is complete, before the mold needs to be opened to release the product from the inner mold insert surface, the sprue plate is first moved upwards by the drive mechanism in the mold. As the sprue plate rises, the power component drives the pusher to move the slider along the groove, causing the protrusion on the slider to retract horizontally into the inner mold insert. As the slider slides, the protrusion at the first end of the slider completely exits from the formed undercut groove, thus completing the undercut release operation. The mold can then be opened, allowing for demolding of injection-molded products with the undercut groove feature. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixed mold structure and the sprue plate structure of this utility model; Figure 2 This is a schematic diagram of the bottom surface structure of the fixed mold structure of this utility model; Figure 3 For the present utility model Figure 2 Schematic diagram of the product structure after it is detached from the inner mold insert; Figure 4 This is a cross-sectional view of the internal structure of the fixed mold structure involved in the embodiment; Figure 5 For the purposes of this embodiment Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram of the structure after the pusher and the pressure plate are separated, as shown in the embodiment. Figure 7 This is a schematic diagram of the internal mold insert structure involved in the embodiment; Figure 8 This is a cross-sectional view of the internal cavity structure of the inner mold insert in the embodiment; Figure 9 This is a schematic diagram of the product structure involved in the embodiment; Figure 10 This is a schematic diagram of the structure after the front mold and inner mold inserts are separated in the embodiment; Figure 11 This is a schematic diagram of the structure of the dovetail groove in the embodiment.

[0017] Numbering in each attached figure: 100. Sprue plate; 200. Fixed mold structure; 201. A plate; 202. Front mold; 203. Groove; 204. Mounting groove; 205. Limiting groove; 206. Receiving groove; 300. Inner mold insert; 301. Inner cavity; 302. Slide groove; 303. Mounting post; 304. Extension post; 400. Product; 401. Undercut groove; 500. Pushing component; 501. Inclined guide part; 502. Threaded hole; 600. Slider; 601. Protrusion; 602. Guide groove; 700. Ejector pin; 701. Elastic component; 702. Pressure plate; 703. Through hole; 704. Threaded locking component. Detailed Implementation

[0018] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] In the description of this utility model, it should be understood that the terms "width", "upper", "lower", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" 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, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between 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.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through other features. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Please refer to Figures 1-11 This utility model provides a mold for internal undercut demolding.

[0023] Reference Figures 1-6 and Figure 9 The mold includes a sprue plate 100, a fixed mold structure 200, and a release mechanism. The sprue plate 100 is positioned above the fixed mold structure 200 and is controlled to move vertically by a drive mechanism (not shown) within the mold. The fixed mold structure 200 has an inner mold insert 300 at its lower part. Since the product 400 has a hollow internal structure, the inner mold insert 300 is used to form the inner cavity of the product 400. The inner mold insert 300 is hollow, and its inner cavity 301 extends vertically, with a horizontally penetrating groove 302 extending through its lower end.

[0024] The tripping mechanism includes a pusher 500, a power component, and a slider 600.

[0025] Specifically, the slider 600 is slidably adapted to the groove 302. The first end of the slider 600 is provided with a protrusion 601 for forming the undercut groove 401, and the protrusion 601 corresponds to the undercut groove 401 on the inner wall of the product 400. The pusher 500 is slidably disposed vertically in the inner cavity 301 of the inner mold insert 300, and the lower end of the pusher 500 is drivenly connected to the slider 600. The power component is disposed between the pusher 500 and the sprue plate 100. The power component is used to drive the pusher 500 to push the slider 600 to slide along the groove 302, so that the protrusion 601 can disengage from the undercut groove 401.

[0026] Before the product 400 is detached from the surface of the inner mold insert 300 after injection molding is completed and the mold needs to be opened, the sprue plate 100 is first moved upward by the drive mechanism in the mold. When the sprue plate 100 rises, the power component drives the pusher 500 to move the slider 600 along the slide groove 302, causing the slider 600 to slide away from the undercut groove 401 of the inner cavity wall of the product 400. This causes the protrusion 601 on the slider 600 to retract into the slide groove 302 in the inner mold insert 300. As the slider 600 slides, the protrusion 601 at the first end of the slider 600 completely exits from the undercut groove 401 formed by the product 400, thus completing the undercut release operation. Then, the mold can be opened, and the injection-molded product 400 with the feature of the undercut groove 401 can be demolded through the cooperation of the release mechanism and the slide groove 302 in the inner mold insert 300.

[0027] Reference Figure 5 and Figure 6The number of sliders 600 includes, but is not limited to, two. Correspondingly, grooves 302 are horizontally formed on opposite sides of the inner cavity 301 in the inner mold insert 300, and each slider 600 is slidably adapted to each groove 302. The protrusions 601 of the two sliders 600 are respectively used for two horizontally symmetrically distributed undercut grooves 401 on the inner wall of the molded product 400, and the two sliders 600 are driven to the lower sides of the pusher 500. Thus, under the driving action of the power component on the pusher 500, the pusher 500 can simultaneously push the two sliders 600 to move towards each other, so that the protrusions 601 of the two sliders 600 can simultaneously disengage from the two undercut grooves 401.

[0028] Reference Figure 5 and Figure 6 Two inclined guide portions 501 are provided on the lower side walls of the pusher 500, which are opposite to the two sliders 600 respectively. The inclined guide portions 501 are inclined from top to bottom in a direction away from the undercut groove 401. A guide groove 602 is provided at the end of the second end of the slider 600. The guide groove 602 is slidably engaged with the inclined guide portion 501. The power component is used to drive the pusher 500 to move the slider 600 away from the undercut groove 401 when the sprue plate 100 rises.

[0029] When the sprue plate 100 moves upward, the power component drives the pusher 500 to move upward. Since the slider 600 is restricted by the slide groove 302 to move only horizontally, the upward movement of the pusher 500 will generate a horizontal component force on the slider 600 through the cooperation of the inclined guide part 501 and the guide groove 602. This will convert the vertical linear motion of the pusher 500 into the horizontal linear motion required by the slider 600 through the cooperation of the inclined guide part 501 and the guide groove 602, thereby pushing the slider 600 to slide horizontally along the slide groove 302 away from the undercut groove 401, so as to realize the disengagement operation between the protrusion 601 and the undercut groove 401.

[0030] Reference Figure 5 and Figure 6The power component includes an ejector pin 700 and an elastic element 701. The ejector pin 700 is located on the upper part of the pusher 500, and the elastic element 701 is located between the ejector pin 700 and the pusher 500. When the mold is in the closed state, the sprue plate 100 and the fixed mold structure 200 are in contact. At this time, the upper end of the ejector pin 700 abuts against the lower part of the sprue plate 100, and the elastic element 701 is in a compressed state. The pusher 500 is located below the inner cavity 301. Driven by the inclined guide 501, the guide portion at the first end of the slider 600 and the undercut recess... When groove 401 is in a fitted state, after product 400 is injection molded, the sprue plate 100 is first raised by the drive mechanism to separate from the fixed mold structure 200. When elastic element 701 rebounds, it drives ejector pin 700 and pusher 500 to rise. When pusher 500 rises, it slides through inclined guide part 501 with guide groove 602 at the second end of slider 600 to drive slider 600 to slide away from undercut groove 401, so that protrusion 601 disengages from undercut groove 401, thereby realizing the disengagement process.

[0031] Reference Figure 5 The power component also includes a pressure plate 702, which is fixed to the upper end of the pusher 500. An elastic element 701 is positioned between the pressure plate 702 and the fixed mold structure 200, while the ejector pin 700 is fixed to the upper wall of the pressure plate 702. In the mold-closed state, the sprue plate 100 applies pressure to the pressure plate 702 through the ejector pin 700, and the pressure plate 702 then evenly transmits the pressure to compress the elastic element 701. In the mold-open state, the elastic element 701 rebounds, causing the pressure plate 702 and the ejector pin 700 to rise. The pressure plate 702 then causes the pusher 500 to rise, thereby driving the protrusion 601 to disengage from the undercut groove 401.

[0032] In other embodiments, the power unit may be an automatically controlled actuator commonly used in the prior art, such as an electric telescopic actuator, which is not limited here.

[0033] Reference Figure 5 , Figure 6 and Figure 11 The inclined guide part 501 is a dovetail slide rail, and the second end of the slider 600 is provided with a dovetail groove that is adapted to slide with the dovetail slide rail. The guide groove 602 is the dovetail groove. The side wall of the lower end of the pusher 500 is an inclined surface that slopes from top to bottom away from the inverted groove 401, so that the dovetail slide rail fixed on the inclined surface is also in an inclined state at the same angle.

[0034] Due to the locking force of the trapezoidal structure between the dovetail slide rail and the dovetail groove, the dovetail slide rail is constrained within the dovetail groove. In this structure, the sliding of the slider 600 is entirely driven by the movement of the dovetail slide rail. When the pusher 500 rises under the restoring force of the elastic member 701, the inclined dovetail slide rail moves vertically upwards accordingly. Since the slider 600 itself is confined within the horizontal slide groove 302 and can only slide horizontally, the upward movement of the dovetail slide rail, through its own inclination, interacts with the dovetail groove, generating a horizontal component force on the slider 600 pointing away from the undercut groove 401. This horizontal component force continuously pushes the slider 600 to move smoothly along the slide groove 302 away from the undercut groove 401 until the protrusion 601 completely disengages from the undercut groove 401, thus reliably completing the disengagement operation.

[0035] In other embodiments, the tilting guide 501 may also be provided on the slider, and correspondingly, the dovetail groove may be provided on the pusher; this is not limited here.

[0036] Reference Figure 4 and Figure 5 The fixed mold structure 200 includes an A plate 201 and a front mold 202. The front mold 202 is detachably mounted on the lower wall of the A plate 201 by bolts, while the inner mold insert 300 is mounted on the lower part of the front mold 202. The lower wall of the A plate 201 has a receiving groove 206 for accommodating a pressure plate 702. The pressure plate 702 is located in the receiving groove 206 and can slide up and down along the receiving groove 206. The upper wall of the A plate 201 has a through groove corresponding to the position of the ejector pin 700, which communicates with the receiving groove 206. The upper end of the ejector pin 700 passes through the through groove and abuts against the lower part of the sprue plate 100. The upper wall of the front mold 202 has a slot 203 corresponding to the elastic member 701. The elastic member 701 is located inside the slot 203, so that the elastic member 701 is positioned between the pressure plate 702 and the front mold 202.

[0037] In the mold-closed state, the sprue plate 100 and plate A 201 are tightly fitted together. The ejector pin 700 is pressed down by the sprue plate 100, transmitting force to the pressure plate 702, causing the pressure plate 702 to be positioned at the lower part of the receiving groove 206. At this time, the pressure plate 702 compresses the elastic element 701, storing elastic potential energy. When the sprue plate 100 rises, the compressed elastic element 701 quickly rebounds, pushing the pressure plate 702 to slide upward within the receiving groove 206 until the pressure plate 702 is fitted against the upper inner wall of the receiving groove 206. During this process, the ejector pin 700 and the pusher 500, which are fixed to the pressure plate 702, also move upwards simultaneously. The top of the ejector pin 700 rises above the A plate 201, while the upward movement of the pusher 500 drives the slider 600 to move horizontally, so that the protrusion 601 can finally be smoothly disengaged from the undercut groove 401 of the product 400. When the sprue plate 100 is reset and re-attached to the A plate 201, the ejector pin 700 is pressed to drive the pressure plate 702 and the pusher 500 to descend and compress the elastic element 701. When the pusher 500 descends, it pushes the slider 600 to reset through the inclined dovetail slide rail, which facilitates the next injection molding operation.

[0038] Specifically, the elastic element 701 is a spring, and there are two springs. The two springs are symmetrically distributed on both sides of the lower part of the pressure plate 702. Correspondingly, there are also two slots 203, and the two slots 203 correspond to the axial positions of the springs. The two springs are respectively set vertically in the two slots 203 on the upper wall of the front mold 202. The upper end of the spring is fixed to the lower wall of the pressure plate 702, while the lower end of the spring is fixed to the lower inner wall of the slot 203.

[0039] Reference Figure 7 , Figure 8 and Figure 10 The front mold 202 and the inner mold insert 300 are detachably connected.

[0040] Specifically, the front mold 202 has a vertically extending mounting groove 204 inside. The upper part of the inner mold insert 300 is integrally formed with a mounting post 303, which is inserted into the mounting groove 204. The two inner side walls of the mounting groove 204 have limiting grooves 205. The two side walls of the mounting post 303, corresponding to the positions of the limiting grooves 205, have extension posts 304, which are embedded in the limiting grooves 205. The inner cavity 301 of the inner mold insert 300 extends vertically upward and passes through the mounting post 303. The upper end of the pusher 500 passes through the opening above the inner cavity 301 and is fixed to the lower wall of the pressure plate 702. Since the A plate 201 and the front mold 202 are detachably connected, and the inner mold insert 300 is detachably connected to the front mold 202, when the inner mold insert 300 needs to be replaced later, the A plate 201 and the front mold 202 are first disassembled and separated, and then the mounting post 303 is taken out from the mounting groove 204, so that the inner mold insert 300 can be removed, which is convenient for replacement and is suitable for products 400 of different shapes.

[0041] Reference Figure 6 The pressure plate 702 is detachably connected to the pusher 500.

[0042] Specifically, the upper end of the mounting post 303 is provided with a threaded hole 502 along the vertical direction, and the center of the pressure plate 702 is provided with a through hole 703 along the vertical direction. A threaded locking member 704 is provided in the through hole 703. The lower end of the threaded locking member 704 is threadedly connected to the mounting post 303. The pressure plate 702 and the pusher 500 are detachably connected through the threaded locking member 704, which facilitates the maintenance of internal parts in the future.

[0043] In summary, the working principle of this utility model is as follows: When the mold is closed, the sprue plate 100 and the A plate 201 are tightly fitted together. The ejector pin 700 is driven by the downward pressure of the sprue plate 100 to push the pressure plate 702 down on the elastic member 701, so that the elastic member 701 is compressed to store elastic potential energy. At this time, the protrusion 601 at the first end of the slider 600 is fitted with the undercut groove 401.

[0044] Before mold opening, the sprue plate 100 is raised by the drive mechanism in the mold. At this time, the lower part of the sprue plate 100 disengages from the upper end of the ejector pin 700 to release the pressure on the elastic element 701. When the elastic element 701 rebounds, it pushes the pressure plate 702, ejector pin 700 and pusher 500 to rise synchronously. The top of the ejector pin 700 even rises above the A plate 201. During the rise of the pusher 500, the inclined dovetail slide rail moves vertically upward. Since the slider 600 itself is confined within the horizontal slide groove 302 and can only slide horizontally, the upward movement of the dovetail slide rail will cooperate with the dovetail groove through its own inclination, generating a horizontal component force on the slider 600 pointing away from the undercut groove 401. The horizontal force continuously drives the slider 600 to move linearly along the groove 302 away from the undercut groove 401, causing the protrusion 601 at the first end of the slider 600 to disengage from the undercut groove 401 on the inner wall of the product 400 cavity 301, thereby completing the disengagement operation. After the disengagement is completed, the mold can be opened, and the product 400 can be disengaged from the inner mold insert 300 by descending with the moving mold (not shown) in the mold. Finally, the product 400 is ejected by the ejection mechanism (not shown) in the mold, thus completing the demolding of the product 400. Therefore, this mold can be used for demolding injection molded products with the feature of an inner undercut groove.

[0045] It should be clarified that the drive mechanism, moving mold, and ejection mechanism that come with the mold are standard technical means in the mold industry and will not be explained here.

[0046] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A mold for internal undercut demolding, comprising a sprue plate, a fixed mold structure, and a release mechanism, wherein the sprue plate is disposed above the fixed mold structure and can be raised and lowered vertically, and the lower part of the fixed mold structure is provided with an inner mold insert for forming the inner cavity of a product, characterized in that: The inner mold insert has a hollow structure, and a groove is formed through the inner cavity of the inner mold insert in the horizontal direction. The release mechanism includes a pusher, a power component, and a slider. The slider is slidably adapted to the groove. The first end of the slider has a protrusion, which is used to form an undercut groove on the inner wall of the product. The pusher is slidably disposed in the inner cavity of the inner mold insert in the vertical direction. The pusher is drivenly connected to the slider. The power component is disposed between the pusher and the sprue plate. The power component is used to drive the pusher to push the slider to slide along the groove, so that the protrusion can disengage from the undercut groove.

2. The mold for internal undercut demolding as described in claim 1, characterized in that: An inclined guide portion is provided on the lower side wall of the pusher corresponding to the slider. The inclined guide portion is inclined from top to bottom in a direction away from the undercut groove. A guide groove is provided at the second end of the slider. The guide groove is slidably engaged with the inclined guide portion. The power component is used to drive the pusher to move the slider away from the undercut groove when the sprue plate rises.

3. The mold for internal undercut demolding as described in claim 2, characterized in that: The power component includes an ejector pin and an elastic element. The ejector pin is located on the upper part of the pusher, and the elastic element is located between the ejector pin and the pusher. The sprue plate and the fixed mold structure are in a fitted state. The upper end of the ejector pin abuts against the lower part of the sprue plate, and the elastic element is in a compressed state. When the sprue plate separates from the fixed mold structure and rises, the elastic element rebounds to drive the pusher to rise.

4. The mold for internal undercut demolding as described in claim 3, characterized in that: The power component also includes a pressure plate, which is fixed to the upper end of the pusher, and the ejector pin is fixed to the upper wall of the pressure plate. The elastic element is disposed between the pressure plate and the fixed mold structure.

5. The mold for internal undercut demolding as described in claim 4, characterized in that: The inclined guide is a dovetail slide rail, and the second end of the slider is provided with a dovetail groove that is adapted to slide with the dovetail slide rail.

6. A mold for internal undercut demolding as described in claim 4 or 5, characterized in that: The fixed mold structure includes an A plate and a front mold. The front mold is detachably disposed on the lower wall of the A plate, and the inner mold insert is disposed at the lower part of the front mold.

7. The mold for internal undercut demolding as described in claim 6, characterized in that: The front mold and the inner mold insert are detachably connected.

8. The mold for internal undercut demolding as described in claim 7, characterized in that: The front mold has a vertically penetrating mounting groove inside. The upper part of the inner mold insert has a mounting post, which is inserted into the mounting groove. The two inner side walls of the mounting groove have limit grooves. The two side walls of the mounting post and the corresponding positions of the limit grooves have extension posts, which are embedded in the limit grooves.

9. A mold for internal undercut demolding as described in claim 4, characterized in that: The pressure plate is detachably connected to the pusher.

10. A mold for internal undercut demolding as described in claim 8, characterized in that: The upper end of the mounting post has a threaded hole along the vertical direction, and the center of the pressure plate has a through hole along the vertical direction. A threaded locking element is inserted through the through hole, and the threaded locking element is threadedly connected to the mounting post.

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