A rapid demolding injection mold for a complex structure plastic part
By designing a rapid demolding injection mold, the problem of difficult demolding of complex plastic parts by traditional molds is solved, achieving precise demolding and uniform cooling of plastic parts, improving product quality and production efficiency, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING CHIHENG MOLD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional injection molds can easily deform or damage complex plastic parts during demolding, resulting in low product quality and production efficiency. Furthermore, uneven cooling can affect dimensional accuracy and surface quality.
A rapid demolding injection mold was designed, employing components such as guide fitting, cooling water pipes, side core pulling mechanism, and reset rod to ensure accurate demolding and uniform cooling of the plastic part. This includes the coordinated work of the upper mold assembly, cavity assembly, and lower mold assembly. The guide fitting is achieved through guide pillars and guide sleeves, the cooling water pipes cool the cavity, the side core pulling mechanism ensures accurate extraction of the side core, and the reset rod quickly resets the push rod.
It improves the dimensional accuracy and surface quality of plastic parts, reduces the risk of deformation and damage, ensures production continuity, reduces raw material waste and rework costs, and improves production efficiency.
Smart Images
Figure CN224489857U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rapid demolding injection mold technology for complex structure plastic parts, and more particularly to a rapid demolding injection mold for complex structure plastic parts. Background Technology
[0002] In modern manufacturing, injection molding is a crucial process widely used in the production of various plastic products. As the application of plastic products across various fields becomes increasingly widespread, the demands for structural complexity and precision in plastic parts are also rising. However, for plastic parts with complex structures, traditional injection molds face numerous challenges during the demolding process.
[0003] Traditional injection molds often encounter difficulties in demolding due to the complexity of the plastic parts, leading to problems such as deformation and damage, which seriously affect product quality and production efficiency. Uneven cooling of the plastic parts also affects their dimensional accuracy and surface quality. To address these issues, a rapid demolding injection mold for complex plastic parts is proposed. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a rapid demolding injection mold for complex plastic parts. It solves the problems that traditional injection molds often encounter during demolding due to the complexity of the plastic parts, leading to difficulties in demolding, deformation, and damage of the plastic parts. These problems seriously affect product quality and production efficiency, and result in uneven cooling of the plastic parts, thus affecting the dimensional accuracy and surface quality of the plastic parts.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a quick-release injection mold for complex structure plastic parts, comprising an upper mold assembly, a cavity assembly, and a lower mold assembly arranged sequentially from top to bottom. The upper mold assembly includes an upper mold base plate, a positioning ring, and an upper template. The positioning ring is disposed on the upper mold base plate, and the upper template is connected to the upper mold base plate. The cavity assembly includes a cavity plate, on which a cavity for molding the plastic part is provided. The lower mold assembly includes a lower mold base plate, a pad, a lower template, a push rod, and a push rod fixing plate. The lower template is disposed on the pad, the push rod is used to push the molded plastic part out of the cavity, and the push rod fixing plate is used to fix the push rod.
[0006] A further improvement is that the upper mold assembly and the cavity assembly are guided and fitted together by guide pillars and guide sleeves; the upper mold assembly includes an upper mold base plate, a positioning ring and an upper template, and the lower mold assembly includes a lower mold base plate, a pad block and a lower template, which are gradually closed by the guiding fit of the guide pillars and guide sleeves.
[0007] A further improvement is that a cooling water pipe is provided between the cavity plate and the lower mold plate for cooling the mold; the molten plastic raw material enters the cavity through the nozzle of the injection molding machine and the gating system of the mold; during the injection process, cooling water is introduced into the cooling water pipe to cool the cavity plate and the lower mold plate, so that the plastic raw material in the cavity gradually cools and solidifies to form the required plastic part; at the same time, the pull rod holds the solidified material in the gating system to prevent it from falling off when the mold is opened.
[0008] A further improvement is that a reset rod is provided in the lower mold assembly, which is used to return the push rod to its initial position after the mold is opened.
[0009] A further improvement is that the cavity assembly is provided with a side core-pulling mechanism, which includes a side core, a side slider, an inclined guide post, and a wedge block. The inclined guide post is used to drive the side slider and the side core to perform lateral core pulling, and the wedge block is used to lock the side slider when the mold is closed. The limiting block restricts the core-pulling distance of the side slider to ensure that the side core can be completely pulled out and avoid interference with the plastic part. When the upper mold assembly and the lower mold assembly are separated to a certain distance, the ejector rod begins to move forward under the action of the ejection mechanism of the injection molding machine.
[0010] A further improvement is that a limiting block is provided in the side core-pulling mechanism, which is used to limit the core-pulling distance of the side slider; during the mold closing process, the wedge block in the side core-pulling mechanism pushes the side slider and the side core to move towards the cavity until the side core reaches the forming position, completing the mold closing action of the side core; at the same time, the limiting block limits the movement distance of the side slider to ensure the accurate position of the side core.
[0011] A further improvement is that the lower mold assembly is equipped with an ejector plate and a pull rod. The ejector plate assists the ejector rod in ejecting the plastic part out of the cavity, and the pull rod is used to pull out the solidified material in the gating system. The ejector rod pushes the ejector plate forward, and the ejector plate contacts the plastic part and ejects it from the cavity. At the same time, the pull rod pulls out the solidified material in the gating system, separating it from the plastic part. After the plastic part is completely demolded, the reset rod, under the action of the spring, pushes the ejector fixing plate and the ejector rod backward to return to the initial position for the next injection molding.
[0012] By employing the above technical solution, this utility model provides a rapid demolding injection mold for complex structural plastic parts, which has at least the following beneficial effects:
[0013] 1. The side core-pulling mechanism of this utility model is precisely designed. The inclined guide post drives the side slider and side core to move smoothly. The limiting block ensures the accuracy of the core-pulling distance and avoids interference between the side core and the plastic part, which greatly reduces the risk of deformation and damage to the plastic part during demolding. The cooling water pipe provides uniform cooling to the cavity plate and the lower mold plate, which makes the plastic part cool fully and evenly, effectively ensuring the dimensional accuracy and surface quality of the plastic part and improving the overall quality of the product.
[0014] 2. The reset rod of this utility model, in conjunction with the spring, can quickly reset the push rod and push rod fixing plate after each demolding, ensuring the smooth progress of the next injection molding, guaranteeing the continuity of production, and improving production efficiency. The synergistic effect of each component reduces the occurrence of demolding failure and quality problems of plastic parts, reduces the waste of raw materials and the rework costs caused by product defects. The effective pulling of the slurry from the gating system by the pull rod also facilitates the subsequent processing and recycling of the slurry, further saving production costs. Attached Figure Description
[0015] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.
[0016] In the attached diagram:
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the oblique side structure of this utility model;
[0019] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;
[0020] Figure 4 This is a schematic diagram of the back side structure of this utility model.
[0021] In the diagram: 1. Upper mold base plate; 2. Positioning ring; 3. Upper template; 4. Guide post; 5. Guide sleeve; 6. Lower mold base plate; 7. Reset rod; 8. Pad block; 9. Lower template; 10. Cavity plate; 11. Cooling water pipe; 12. Push rod fixing plate; 13. Push plate; 14. Pull rod; 15. Push rod; 16. Push rod fixing block; 17. Spring; 18. Side core; 19. Side slider; 20. Inclined guide post; 21. Wedge block; 22. Limit block. Detailed Implementation
[0022] 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.
[0023] Traditional injection molds often encounter difficulties in demolding due to the complexity of the plastic part's structure, leading to problems such as deformation and damage, severely impacting product quality and production efficiency. Uneven cooling of the plastic part further affects its dimensional accuracy and surface quality. This embodiment provides a rapid demolding injection mold for complex plastic parts. Please refer to [reference needed]. Figures 1-4 This embodiment provides a rapid demolding injection mold for complex-structured plastic parts, including an upper mold assembly, a cavity assembly, and a lower mold assembly arranged sequentially from top to bottom. The upper mold assembly includes an upper mold base plate 1, a positioning ring 2, and an upper template 3. The positioning ring 2 is disposed on the upper mold base plate 1, and the upper template 3 is connected to the upper mold base plate 1. The cavity assembly includes a cavity plate 10, on which a cavity for molding the plastic part is provided. The lower mold assembly includes a lower mold base plate 6, a pad 8, a lower template 9, a push rod 15, and a push rod fixing plate 12. The lower template 9 is disposed on the pad 8. The push rod 15 is used to push the molded plastic part out of the cavity, and the push rod fixing plate 12 is used to fix the push rod 15. The upper mold assembly and the cavity assembly are guided and fitted by guide pillars 4 and guide sleeves 5. The cavity plate 10 and the lower mold assembly are connected by a guide post 4 and a guide sleeve 5. Cooling water pipes 11 are provided between plates 9 for cooling the mold; a reset rod 7 is provided in the lower mold assembly, which is used to return the push rod 15 to its initial position after the mold is opened; a side core pulling mechanism is provided in the cavity assembly, which includes a side core 18, a side slider 19, an inclined guide post 20 and a wedge block 21. The inclined guide post 20 is used to drive the side slider 19 and the side core 18 to perform lateral core pulling, and the wedge block 21 is used to lock the side slider 19 when the mold is closed; a limit block 22 is provided in the side core pulling mechanism, which is used to limit the core pulling distance of the side slider 19; an ejector plate 13 and a pull rod 14 are provided in the lower mold assembly. The ejector plate 13 is used to assist the push rod 15 in pushing the plastic part out of the cavity, and the pull rod 14 is used to pull out the solidified material in the gating system.
[0024] Working principle: The upper mold assembly includes an upper mold base plate 1, a positioning ring 2, and an upper template 3, and the lower mold assembly includes a lower mold base plate 6, a pad block 8, and a lower template 9. The molds gradually close together through the guidance of guide pillars 4 and guide sleeves 5.
[0025] During the mold closing process, the wedge block 21 in the side core pulling mechanism pushes the side slider 19 and the side core 18 to move towards the cavity until the side core 18 reaches the molding position, completing the mold closing action of the side core; at the same time, the limiting block 22 restricts the movement distance of the side slider 19 to ensure the accurate position of the side core 18; after the upper mold assembly and the lower mold assembly are fully closed, the injection molding machine begins to inject molten plastic raw material into the mold cavity;
[0026] Molten plastic raw material enters the cavity through the nozzle of the injection molding machine and the gating system of the mold; during the injection process, cooling water is introduced into the cooling water pipe 11 to cool the cavity plate 10 and the lower mold plate 9, so that the plastic raw material in the cavity gradually cools and solidifies to form the required plastic part; at the same time, the pull rod 14 pulls the solidified material in the gating system to prevent it from falling off when the mold is opened.
[0027] After injection molding is completed, the injection molding machine begins to open the mold; the upper mold assembly and the lower mold assembly gradually separate under the action of the injection molding machine; during the mold opening process, the inclined guide post 20 drives the side slider 19 and the side core 18 to move away from the cavity as the upper mold assembly moves, realizing the side core pulling action; the limit block 22 limits the core pulling distance of the side slider 19 to ensure that the side core 18 can be completely pulled out and avoid interference with the plastic part; when the upper mold assembly and the lower mold assembly are separated to a certain distance, the push rod 15 begins to move forward under the action of the ejection mechanism of the injection molding machine;
[0028] The push rod 15 pushes the push plate 13 forward, the push plate 13 contacts the plastic part and pushes it out of the cavity; at the same time, the pull rod 14 pulls out the solidified material in the gating system, separating it from the plastic part; after the plastic part is completely demolded, the reset rod 7 pushes the push rod fixing plate 12 and the push rod 15 backward under the action of the spring 17, returning to the initial position, so as to carry out the next injection molding.
[0029] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0030] 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 rapid demolding injection mold for complex structure plastic parts, comprising an upper mold assembly, a cavity assembly, and a lower mold assembly arranged sequentially from top to bottom, characterized in that: The upper mold assembly includes an upper mold base plate (1), a positioning ring (2), and an upper template (3). The positioning ring (2) is disposed on the upper mold base plate (1), and the upper template (3) is connected to the upper mold base plate (1). The cavity assembly includes a cavity plate (10), on which a cavity for molding plastic parts is disposed. The lower mold assembly includes a lower mold base plate (6), a pad (8), a lower template (9), a push rod (15), and a push rod fixing plate (12). The lower template (9) is disposed on the pad (8), the push rod (15) is used to push the molded plastic parts out of the cavity, and the push rod fixing plate (12) is used to fix the push rod (15).
2. The quick-release injection mold for complex structure plastic parts according to claim 1, characterized in that: The upper mold assembly and the cavity assembly are guided and fitted together by guide pillars (4) and guide sleeves (5).
3. The quick-release injection mold for complex structure plastic parts according to claim 1, characterized in that: A cooling water pipe (11) is provided between the cavity plate (10) and the lower template (9) for cooling the mold.
4. A quick-release injection mold for complex structure plastic parts according to claim 1, characterized in that: The lower mold assembly is provided with a reset rod (7), which is used to return the push rod (15) to its initial position after the mold is opened.
5. A quick-release injection mold for complex structural plastic parts according to claim 1, characterized in that: The cavity assembly is provided with a side core pulling mechanism, which includes a side core (18), a side slider (19), an inclined guide post (20), and a wedge block (21). The inclined guide post (20) is used to drive the side slider (19) and the side core (18) to perform lateral core pulling, and the wedge block (21) is used to lock the side slider (19) when the mold is closed.
6. A quick-release injection mold for complex structure plastic parts according to claim 5, characterized in that: The side core-pulling mechanism is provided with a limit block (22), which is used to limit the core-pulling distance of the side slider (19).
7. A quick-release injection mold for complex structure plastic parts according to claim 1, characterized in that: The lower mold assembly is provided with a push plate (13) and a pull rod (14). The push plate (13) is used to assist the push rod (15) in pushing the plastic part out of the cavity, and the pull rod (14) is used to pull out the solidified material in the gating system.