Injection mold for cosmetic sand finish cover

Abstract

The utility model provides a kind of injection mold of cosmetic sand surface outer cover, it is related to injection mold field, comprising: front mould assembly, rear mould assembly and threaded demolding mechanism;The front mould assembly is equipped with integral sand surface cavity, and its head is equipped with keyhole forming slider;The rear mould assembly is equipped with buckle position forming slider, and the anti-jamming slope of this buckle position forming slider is greater than the slope of its driving mechanism;The threaded demolding mechanism includes threaded rotating core with anti-friction slope and special-shaped rotation-stopping core, and both constitute retrograde tooth structure;The mold is configured with parting timing control structure.The application avoids parting line and strain by using integral sand surface cavity, improves appearance quality;Through parting timing control, keyhole slider and buckle slider are in turn given way, cooperate with retrograde tooth threaded mechanism, solve the interference problem of front and rear mould slider, ensure that thread demolds smoothly, improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular to an injection mold for a cosmetic frosted outer cover. Background Technology

[0002] In the field of injection molds, as the core equipment of the injection molding process, the working principle integrates knowledge from multiple disciplines. From the melting of plastic raw materials under high temperature and screw action, to the injection pressure being injected into the mold cavity, and then cooling and solidifying to form the plastic product, each step requires precise control. In the cosmetic packaging industry, injection molds are widely used to produce various packaging containers and components. Among them, the cosmetic frosted outer cover, as an important component to enhance the product's appearance and texture, has high requirements for the design and manufacturing of its injection mold.

[0003] Currently, traditional injection molds for cosmetic frosted plastic covers often employ a half-slider full-enclosure injection molding method. While this method can achieve product molding to a certain extent, it has several drawbacks. Firstly, the parting line is very obvious after molding. This is because the half-slider's parting structure inevitably leaves marks on the product surface during mold closing and opening. As the cosmetic frosted plastic cover is directly exposed to consumers, a prominent parting line severely impacts the overall aesthetics of the product, lowering its perceived quality. Secondly, the product is easily scratched during demolding. Due to the material properties of the frosted plastic cover and the friction between the half-slider and the product, the frosted surface structure is easily damaged during demolding, resulting in scratches, tears, and other defects. This not only damages the product's appearance but also increases the defect rate, requiring extensive subsequent repair work, and may even lead to the scrapping of some products, severely impacting production efficiency and increasing production costs.

[0004] Therefore, an injection mold for a cosmetic frosted outer cover is proposed. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by employing an integral sand-surface cavity to avoid parting lines and scratches, thereby improving appearance quality. Through parting sequence control, the keyhole slider and the snap-on slider are positioned sequentially, and in conjunction with the reverse thread mechanism, the interference problem between the front and rear mold sliders is solved, ensuring smooth demolding of the threads and improving production efficiency.

[0006] In order to solve the above-mentioned technical problems, the present invention solves the problem that the traditional half-slider full-enclosure injection molding method is prone to obvious parting lines and tearing through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An injection mold for a cosmetic frosted outer cover includes: Front mold assembly, rear mold assembly, and threaded demolding mechanism; The front mold assembly is provided with an integral sand-surface cavity, and its head is provided with a keyhole forming slider; The rear mold assembly is provided with a snap-fit ​​forming slider, and the anti-jamming slope of the snap-fit ​​forming slider is greater than the slope of its driving mechanism. The threaded demolding mechanism includes a threaded rotating core with a friction-reducing angle and a non-rotating core, which together form a reverse tooth structure. The mold is equipped with a parting sequence control structure, which drives the keyhole forming slider to open the mold first to make room, then drives the snap-fit ​​forming slider to open the mold to make room, and finally drives the threaded core to retract and demold.

[0008] Preferably, the parting timing control structure includes a three-level parting surface: The PL1 parting surface controls the mold opening of the keyhole forming slider; PL2 parting line controls gate material removal; The PL3 parting surface controls the mold opening of the snap-fit ​​forming slider.

[0009] Preferably, the keyhole forming slider adopts an insertion positioning structure and is connected to the upper mold hook leg drive, and the bottom of the integral sand-surface cavity is provided with a heightened clearance section.

[0010] Preferably, the upper mold pull pin is movably provided in the slider seat of the keyhole forming slider. The upper mold pull pin constitutes a separable core of the insertion positioning structure, and its axial pull-out stroke is greater than the keyhole depth.

[0011] Preferably, the tail of the upper mold pull pin is connected to the upper mold hook leg, and the mold is opened synchronously with the keyhole forming slider by the PL1 parting surface.

[0012] Preferably, the snap-fit ​​forming slider is driven by the lower mold hook leg, and its anti-jamming slope is 3°-5° larger than the driving shovel slope.

[0013] Preferably, the anti-friction angle of the threaded core is set on the inner and outer mating surfaces, and a threaded sleeve is fitted on the outer side, with a graphite copper sleeve and a wear-resistant pad between them.

[0014] Preferably, the irregular anti-rotation core is a lower die punch, the outline of which matches the irregular structure of the inner wall of the product.

[0015] Preferably, the threaded demolding mechanism includes a rack and pinion drive assembly, and the threaded core is guided by a ball bushing.

[0016] Preferably, the rear mold assembly further includes a lower mold pusher plate, the ejection direction of which is parallel to the axial direction of the threaded core.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The injection mold for the cosmetic frosted outer cover provided in this application avoids parting lines and scratches by adopting an integral frosted cavity, thereby improving the appearance quality. By controlling the parting sequence, the keyhole slider and the snap-on slider are moved out of position in sequence. With the help of the reverse thread mechanism, the interference problem between the front and rear mold sliders is solved, ensuring smooth demolding of the threads and improving production efficiency.

[0018] This application improves motion precision through refined parting control; enhances keyhole forming stability through insertion positioning and needle extraction design; optimizes the angle of the snap-on slider to prevent jamming; and reduces jamming through the threaded core rotating friction reduction structure, further ensuring both appearance and production efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This utility model Figure 2 A partial structural diagram; Figure 4 This is a schematic diagram of the structure of the present invention with PL1 in the open state; Figure 5 This is a schematic diagram of the structure of the present invention with PL2 in the open state; Figure 6 This is a schematic diagram of the structure of the PL3 in the open state of this utility model; Figure 7 This is a schematic diagram of the structure of PL4 in the open state of this utility model; Figure 8 This is a schematic diagram of the upper mold extraction pin and the product structure of this utility model; Figure 9 This is a schematic diagram of the product structure of this utility model.

[0021] Drawing number explanation: 1. Front mold assembly; 2. Rear mold assembly; 3. Threaded demolding mechanism; 4. Upper mold pull pin; 5. Lower mold hook leg; 6. Snap-fit ​​forming slider; 7. Lower mold push plate; 8. Ball bushing; 9. Threaded rotating core; 10. Irregular anti-rotation core; 11. Unthreaded sleeve; 12. Wear-resistant pad; 13. Graphite copper sleeve; 14. Rack; 15. Integral sand-finish cavity; 16. Keyhole forming slider; 17. Upper mold hook leg. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0024] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0025] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0026] Example: Please see Figure 1-9 An injection mold for a cosmetic frosted surface cover includes: a front mold assembly 1, a rear mold assembly 2, and a threaded demolding mechanism 3; the front mold assembly 1 has an integral frosted surface cavity 15, and its head has a keyhole forming slider 16; the rear mold assembly 2 has a snap-fit ​​forming slider 6, the snap-fit ​​forming slider 6 having an anti-jamming draft angle greater than the draft angle of its driving mechanism; the threaded demolding mechanism 3 includes a threaded rotating core 9 with a friction-reducing draft angle and a non-rotating core 10, which together form a reversing tooth structure; the mold is equipped with a parting sequence control structure, which includes multiple parting surfaces and corresponding driving components. By sequentially opening the parting surfaces and coordinating the action of the driving components, the keyhole forming slider 16 opens the mold first to make room, the snap-fit ​​forming slider 6 opens the mold later to make room, and finally the threaded rotating core 9 achieves reversing demolding.

[0027] The injection mold for the cosmetic frosted outer cover of this application is mainly composed of a front mold assembly 1, a rear mold assembly 2, a threaded demolding mechanism 3, and a parting sequence control structure. The components work together to achieve precise molding and smooth demolding of the product. The following is a detailed description of the structure and working principle.

[0028] The front mold assembly 1 is a key component in the sandblasting of the product's outer surface. Its core design avoids the parting line defects of traditional split-sliders. Specifically, it includes an integral sandblasting cavity 15, which adopts an integral structure to directly form the sandblasted effect on the product's outer surface. Unlike the segmented structure of split-sliders, this integral cavity has no splicing parting line, thus avoiding the problem of obvious parting lines at the source. At the same time, the bottom of the integral sandblasting cavity 1 extends to form a raised clearance, the height of which H is 1.2-1.5 times the thickness of plate A. By increasing the height of the integral sandblasting cavity 15, the structural strength of the front mold plate A and the mold core is improved (not shown in the figure). Since the front mold needs to be equipped with a keyhole forming slider 16, the installation of the slider may hollow out part of plate A. The raised clearance can compensate for the strength loss and prevent mold deformation from affecting the forming accuracy.

[0029] The keyhole structure at the product head is formed by a keyhole forming slider 16. To reduce the slider's volume and adapt to the product's miniaturization, the keyhole forming slider 16 adopts an insertion positioning structure. An upper mold pull pin 4 is movably disposed within the slider seat, and the upper mold pull pin 4 movably passes through the keyhole forming slider 2. The two are engaged through a tapered insertion, forming a complete keyhole forming surface with the slider. The axial withdrawal stroke of the upper mold pull pin 4 is greater than the keyhole depth, ensuring complete separation from the product during withdrawal and preventing damage to the inner wall of the keyhole.

[0030] In addition, the keyhole forming slider 16 is driven by the upper mold hook leg 17, and the tail of the upper mold pull pin 4 is connected to the upper mold hook leg 17 to achieve synchronous action of the two and ensure the stability of insertion and positioning.

[0031] The rear mold assembly 2 is used to form the inner structure of the product (such as the snap-fit), and needs to cooperate with the front mold to achieve interference-free demolding. Its core design is the snap-fit ​​forming slider 6. The snap-fit ​​on the inner side of the product is formed by this slider. Because the outer surface of the product is an integral cavity, the parting line needs to be set at the R corner, which causes the outer side of the thread structure to be wrapped by the cavity and cannot be directly avoided. Therefore, the snap-fit ​​forming slider 6 needs to be opened to make way before unscrewing.

[0032] Meanwhile, to avoid interference between the slider and the cavity, the slider is designed with a non-clamping angle, which is greater than the angle of its driving mechanism (the shovel of the lower mold hook leg 5), with a specific difference of 3°-5°. This design allows for sufficient clearance during the slider's sliding process, preventing friction and tearing of the product caused by mold assembly errors or thermal expansion and contraction. The snap-fit ​​forming slider 6 is driven by the lower mold hook leg 5, ensuring precise and controllable sliding action.

[0033] The product has a threaded structure on its inner side, and demolding is achieved through a threaded demolding mechanism 3. The design focus of the threaded demolding mechanism 3 is to reduce friction and avoid jamming. The threaded demolding mechanism 3 includes a threaded rotating core 9, a non-rotating core 10, and a rack 14. The rotating core surface has a friction-reducing slope, and the slope is distributed on the inner and outer mating surfaces, which can reduce the frictional resistance during demolding. A threaded sleeve 11 is fitted on the outer side, and a graphite copper sleeve 13 and a wear-resistant pad 12 are assembled between the two. The graphite copper sleeve 13 has self-lubricating properties, and the wear-resistant pad 12 can improve the wear resistance of the mating surfaces, together reducing the oil stains generated by friction and the risk of jamming.

[0034] The threaded rotating core 9 and the irregular anti-rotation core 10 form a backward tooth structure. The non-circular irregular structure inside the product achieves the anti-rotation function. During demolding, the threaded rotating core 9 rotates backward, and the irregular anti-rotation core 10 restricts the product to rotate synchronously with the rotating core, ensuring that the thread is smoothly released.

[0035] The rack 14 meshes with the gear at the shaft end of the threaded core 9 (not shown in the figure), converting the linear motion of mold opening into the rotational motion of the core.

[0036] Because both the front and rear molds are equipped with sliders, and the product size is small, timing control is required to ensure that the movements of each component are orderly and without interference. This structure includes three-level parting surfaces and corresponding drive components.

[0037] Specifically, the PL1 parting surface cooperates with the upper mold hook leg 17 of the drive assembly for the keyhole forming slider 16, controlling the keyhole forming slider 16 and the upper mold pull pin 4 to open the mold first, achieving the first disengagement of the keyhole structure. The PL2 parting surface cooperates with the gate stripping drive component, opening after the keyhole forming slider 16 disengages, completing the separation of the gate from the product and the stripping head. The PL3 parting surface cooperates with the drive assembly (lower mold hook leg 5) for the snap-fit ​​forming slider 6, opening after the gate stripping, controlling the snap-fit ​​forming slider 6 to slide open, making way for thread demolding.

[0038] The ball bushing 8 has an embedded row of circulating balls that make point contact (not surface contact) with the outer diameter of the threaded mandrel 9, ensuring the linear motion accuracy of the mandrel 9 and avoiding shear damage to the thread teeth caused by runout.

[0039] In addition, the mold is also equipped with a PL4 parting surface for ejecting the product with an ejector roller, which works in conjunction with a robotic arm to pick up the part (not shown in the figure).

[0040] The working process of this mold includes mold opening and mold closing actions. Through the sequential opening of the parting surface and the coordinated operation of various mechanisms, the product can be formed and demolded without damage, as detailed below: Phase 1: Mold opening, PL1 parting surface opens and drives the keyhole forming slider 2 to retract, the upper mold pin 4 is simultaneously pulled out of the keyhole, the gate separation is independently controlled by PL2 parting surface to ensure the initial separation of the sprue head.

[0041] Second stage: After PL1 completes its action, PL2 is activated, and the gate ejection drive component operates specifically to completely detach the disconnected gate head from the product, avoiding any residue.

[0042] Phase 3: After the PL2 parting surface action is completed, the PL3 parting surface opens, driving the lower mold hook leg 5 to move: the lower mold hook leg 5 drives the snap-fit ​​forming slider 6 to slide open. Because the slider avoids the jamming angle is 3°-5° larger than the shovel angle, it maintains a gap with the cavity during the sliding process, without friction interference; after the slider slides open, the snap-fit ​​inside the product is fully exposed, making way for subsequent thread demolding.

[0043] Fourth stage: After the PL3 parting surface opens and the drive snap-fit ​​forming slider 6 slides out, the threaded core 9 immediately begins to retract and demold. The threaded core 9 rotates with the cooperation of the unthreaded sleeve 11. Because the threaded core 9 is equipped with a friction-reducing draft angle and the mating surface is equipped with a graphite copper sleeve 13 and a wear-resistant pad 12, the frictional resistance is greatly reduced. At the same time, the irregular anti-rotation core 10 restricts the rotation of the product. The threaded core 9 achieves a compound motion of rotation and retraction through the unthreaded structure, gradually disengaging from the inner thread of the product.

[0044] Fifth stage: After the threads are disengaged, the lower mold push plate 7 moves upward under the drive of the ejector roller, lifting the product as a whole from the rear mold core, so that the product is completely separated from the rear mold assembly.

[0045] Phase 6: The robotic arm extends into the mold to remove the product, completing the mold opening process.

[0046] Before mold closing, the threaded demolding mechanism 3 reverses its movement, and the threaded core 9 rotates to reset, ensuring it matches the product molding position. Each parting surface closes sequentially, the snap-fit ​​molding slider 6 resets under the drive of the shovel, and the keyhole molding slider 16 and the upper mold pin 4 return to their positions under the action of the mold closing force. The mold returns to the injection molding state, waiting for the next molding cycle.

[0047] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. An injection mold for a cosmetic frosted surface cover, characterized in that, include: Front mold assembly (1), rear mold assembly (2) and threaded demolding mechanism (3); The front mold assembly (1) is provided with an integral sand-surface cavity (15), and its head is provided with a keyhole forming slider (16). The rear mold assembly (2) is provided with a snap-fit ​​forming slider (6), the angle of the snap-fit ​​forming slider (6) is greater than the angle of its driving mechanism; The threaded demolding mechanism (3) includes a threaded rotating core (9) with a friction-reducing angle and a non-rotating core (10), which together form a reverse tooth structure; The mold is equipped with a parting sequence control structure, which includes multiple parting surfaces and corresponding driving components. By opening the parting surfaces in sequence and coordinating the action of the driving components, the keyhole forming slider (16) opens the mold first to make room, the snap-fit ​​forming slider (6) opens the mold later to make room, and finally the threaded core (9) achieves demolding by reversing.

2. The injection mold for a cosmetic frosted surface cover according to claim 1, characterized in that: The parting timing control structure includes a three-level parting surface and corresponding driving components: The PL1 parting surface cooperates with the drive assembly of the keyhole forming slider (16) to control the keyhole forming slider (16) to open the mold first; The PL2 parting surface cooperates with the gate ejection drive component to control gate ejection; The PL3 parting surface cooperates with the drive assembly of the drive snap-fit ​​forming slider (6) to control the snap-fit ​​forming slider (6) to open the mold.

3. The injection mold for a cosmetic frosted surface cover according to claim 2, characterized in that: The keyhole forming slider (16) adopts an insertion positioning structure and is connected to the upper mold hook leg (17) for driving. The bottom of the integral sand surface cavity (15) is provided with a heightened clearance section.

4. The injection mold for a cosmetic frosted surface cover according to claim 3, characterized in that: The keyhole forming slider (16) has an upper mold pull pin (4) movably mounted inside the slider seat. The upper mold pull pin (4) constitutes a separable core of the insertion positioning structure, and its axial pull-out stroke is greater than the keyhole depth.

5. The injection mold for a cosmetic frosted surface cover according to claim 4, characterized in that: The upper mold pull pin (4) is connected to the upper mold hook leg (17) at the tail and is driven by the PL1 parting surface to open the mold synchronously with the keyhole forming slider (16).

6. The injection mold for a cosmetic frosted outer cover according to claim 1, characterized in that: The snap-fit ​​forming slider (6) is driven by the lower mold hook leg (5), and its anti-jamming slope is 3°-5° larger than the driving shovel slope.

7. The injection mold for a cosmetic frosted outer cover according to claim 1, characterized in that: The anti-friction angle of the threaded core (9) is set on the inner and outer mating surfaces, and the outer side is fitted with a threaded sleeve (11), with a graphite copper sleeve (13) and a wear-resistant pad (12) between them.

8. The injection mold for a cosmetic frosted outer cover according to claim 1, characterized in that: The irregular anti-rotation core (10) is a lower die punch, the outline of which matches the irregular structure of the inner wall of the product.

9. The injection mold for a cosmetic frosted outer cover according to claim 1, characterized in that: The threaded demolding mechanism (3) includes a rack (14) transmission assembly, and the threaded core (9) is guided by a ball bushing (8).

10. The injection mold for a cosmetic frosted outer cover according to claim 1, characterized in that: The rear mold assembly (2) also includes a lower mold push plate (7), whose ejection direction is parallel to the axial direction of the threaded core (9).

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