Injection mold for a profiled silicone element

Abstract

This utility model discloses an injection mold for irregularly shaped silicone parts, including an upper mold plate, a lower mold base, and a mold core disposed between the upper mold plate and the lower mold base. A guide shaft is fixed on the lower mold base, and mold core guide holes and upper mold guide holes are respectively opened on the mold core and the upper mold plate, which slide and engage with the guide shaft. The injection mold for irregularly shaped silicone parts of this utility model ensures precise alignment of mold opening and closing through the sliding engagement of the guide shaft with the mold core guide holes and the upper mold guide holes. At the same time, the molding block adopts a guide inclined surface sliding design of the first molding column and the second molding column, so that the transverse diameter actively shrinks during demolding, effectively reducing the phenomena of ejection and sticking during the demolding process of thin-walled irregularly shaped parts, optimizing the product molding quality, thereby simplifying the complexity of traditional multi-component demolding mechanisms, significantly improving production efficiency and operational convenience, greatly improving the demolding success rate, significantly improving product quality and overall production efficiency, and achieving multiple beneficial effects.

Description

Technical Field

[0001] This utility model relates to the field of silicone parts manufacturing technology, specifically to an injection mold for irregularly shaped silicone parts. Background Technology

[0002] As described in the published patent CN202137904U, "Mold for producing irregularly shaped thin-walled injection molded products", injection molds are important process equipment for producing various industrial products. With the rapid development of the plastics industry and the promotion and application of plastic products in industries such as aviation, aerospace, electronics, machinery, shipbuilding and automobiles, the requirements for molds are becoming increasingly higher.

[0003] Rubber molds are classified into four main types based on their structure and manufacturing process: compression molding molds, die-casting molds, injection molding molds, and extrusion molding molds. Injection molding involves melting plastic material and injecting it into a mold cavity. Once inside the mold, the molten plastic cools and molds according to the cavity's structure, resulting in the final product shape, which requires no further processing before installation or use. Many details, such as protrusions, ribs, and threads, can be formed in a single injection molding operation.

[0004] For rubber products with complex shapes and thin walls, the mold is not easy to remove after static compression molding. During the demolding process, thin-walled products suffer from severe puncture and sticking to the mold. Two or more multi-component demolding mechanisms are required to help the product demold, which is complicated to operate and has low production efficiency.

[0005] In summary, there is a problem of inconvenient demolding during the injection molding process of thin-walled irregular parts. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution for injection molds of irregularly shaped silicone parts that can solve the aforementioned problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An injection mold for irregularly shaped silicone parts includes an upper mold plate, a lower mold base, and a mold core disposed between the upper mold plate and the lower mold base;

[0009] The lower mold base is fixedly provided with a guide shaft, and the mold core and the upper mold plate are respectively provided with a mold core guide hole and an upper mold guide hole that slide and fit on the guide shaft;

[0010] The mold core is provided with a molding cavity, and the lower end face of the upper template is provided with a molding block that is inserted into the molding cavity for product molding.

[0011] The forming block includes a first forming column fixed to the lower end face of the upper template, a first guide slope is provided on the first forming column, a second forming column is provided on the first guide slope, and a second guide slope is provided on the second forming column to slide and abut against the first guide slope.

[0012] The upper template has a first adjustment groove that runs vertically through it, and the first forming column has a second adjustment groove that communicates with the first adjustment groove. A pressure regulating component is installed in the first adjustment groove.

[0013] As a further embodiment of this utility model: a T-shaped first guide groove is provided on the first guide inclined surface, and a T-shaped block that slides in the first guide groove is fixed on the second guide inclined surface.

[0014] As a further embodiment of this utility model: the first guide groove is opened at the upper end of the first guide slope, and the lower end opening of the second adjustment groove is opened at the lower end of the first guide slope.

[0015] As a further embodiment of this utility model: an elastic element is installed in the first guide groove, one end of the elastic element abuts against the lower side wall of the first guide groove, and the other end of the elastic element abuts against the lower end face of the T-shaped block.

[0016] As a further embodiment of this utility model: gray cast iron contact surfaces are respectively provided between the first guide slope and the second guide slope.

[0017] As a further embodiment of this utility model: the mold core is provided with a lower forming groove that aligns with the forming chamber, and a rubber soft ring that abuts against the first forming post and the second forming post is installed in the lower forming groove.

[0018] As a further embodiment of this utility model: the molding chamber is provided in multiple ways, and the upper end face of the mold core is provided with flow channels that are respectively connected to each molding chamber.

[0019] As a further embodiment of this utility model: the pressure regulating component includes a pneumatic cylinder or a hydraulic cylinder.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This utility model's injection mold for irregularly shaped silicone parts ensures precise mold opening and closing through the sliding fit between the guide shaft, the mold core guide hole, and the upper mold guide hole. Simultaneously, the molding block employs a sliding guide slope design for the first and second molding pillars, causing the lateral diameter to actively shrink during demolding. This effectively reduces ejection and sticking phenomena during the demolding process of thin-walled irregularly shaped parts, optimizing product molding quality. This simplifies the complexity of traditional multi-component demolding mechanisms, significantly improving production efficiency and operational convenience. It offers multiple beneficial effects, including a substantial increase in demolding success rate, significantly improved product quality, and enhanced overall production efficiency. Attached Figure Description

[0022] Figure 1 This is a three-dimensional view of the structure of this utility model in its open state;

[0023] Figure 2 This is a three-dimensional view of the structure of this utility model in its closed state;

[0024] Figure 3 This is a top view of the present invention;

[0025] Figure 4 yes Figure 3 A cross-sectional view along the AA direction;

[0026] Figure 5 yes Figure 4 A partial view at point B in the middle;

[0027] The reference numerals and names in the figure are as follows:

[0028] 101-Upper mold plate, 102-Lower mold base, 103-Mold core, 105-Guide shaft, 106-Mold core guide hole, 107-Upper mold guide hole, 108-Molding chamber, 109-Molding block, 110-First molding pillar, 111-First guide ramp, 112-Second molding pillar, 113-Second guide ramp, 114-First adjusting groove, 115-Second adjusting groove, 116-Pressure adjusting component, 117-T-block, 118-First guide groove, 119-Elastic component, 120-Gray cast iron contact surface, 121-Lower molding groove, 122-Rubber soft ring, 123-Runner. Detailed Implementation

[0029] 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.

[0030] Please see Figure 1-5An injection mold for irregularly shaped silicone parts includes an upper mold plate 101, a lower mold base 102, and a mold core 103 disposed between the upper mold plate 101 and the lower mold base 102;

[0031] The lower mold base 102 is fixedly provided with a guide shaft 105, and the mold core 103 and the upper mold plate 101 are respectively provided with a mold core guide hole 106 and an upper mold guide hole 107 that slide and cooperate with the guide shaft 105.

[0032] The mold core 103 has a molding chamber 108, and the lower end face of the upper template 101 has a molding block 109 that is inserted into the molding chamber 108 for product molding.

[0033] The molding block 109 includes a first molding column 110 fixed to the lower end face of the upper template 101. A first guide slope 111 is provided on the first molding column 110. A second molding column 112 is provided on the first guide slope 111. A second guide slope 113 is provided on the second molding column 112 that slides and abuts against the first guide slope 111.

[0034] The upper template 101 is provided with a first adjustment groove 114 that extends vertically, and the first forming column 110 is provided with a second adjustment groove 115 that communicates with the first adjustment groove 114. A pressure regulating component 116 is installed in the first adjustment groove 114.

[0035] The injection mold for irregularly shaped silicone parts of this utility model has a guide shaft 105 fixedly set in the lower mold base 102, and a mold core guide hole 106 and an upper mold guide hole 107 that slide with it on the mold core 103 and the upper mold plate 101, respectively. This ensures the accurate positioning and smooth movement of the upper mold, mold core and lower mold during the mold opening and closing process, and effectively prevents product damage or flash caused by misalignment.

[0036] The first molding column 110 and the second molding column 112 cooperate to form a molding block 109. The molding block 109 cooperates within the molding chamber 108 to form an injection molding chamber. Molten raw material is injected into the injection molding chamber. After the product is injection molded, the mold is opened (the upper mold plate 101 rises). Then, the first molding column 110, fixed to the upper mold plate 101, slides and abuts against the second guide slope 113 of the second molding column 112 through its first guide slope 111. This slope engagement structure forces the second molding column 112 to make a radially inward (lateral diameter reduction) displacement relative to the first molding column 110, causing the molding block 109 to... The overall cross-sectional dimensions actively shrink during demolding, thereby greatly reducing the demolding resistance of irregularly shaped thin-walled silicone parts (especially those with undercuts or complex sidewall structures). This fundamentally solves the problems of punching, tearing, or severe sticking that are prone to occur when demolding such products using traditional molds. At the same time, the first adjustment groove 114 opened on the upper mold plate 101 is connected to the second adjustment groove 115 on the first molding column 110 and a pressure adjustment component 116 is provided. This not only eliminates the complex multi-element demolding mechanism in traditional solutions, simplifying the mold structure and operation process, but also significantly improves the demolding success rate, production efficiency, and product yield of irregularly shaped thin-walled silicone parts.

[0037] The guide shaft 105 passes through the mold core guide hole 106 and the upper mold guide hole 107, providing precise guidance for the upper template 101 and mold core 103, which are the core moving parts of the mold. Effect: It prevents the product from being pulled, crushed, or producing flash burrs due to misalignment during the mold opening and closing process, and ensures the repeatability accuracy of the mold operation and the stability of product quality, which is especially important for the molding of complex irregular parts.

[0038] When the mold is opened, the pressure regulating component 116 injects high-pressure gas / liquid into the first regulating groove 114 and the second regulating groove 115. Under the action of the pressure regulating component 116, the second molding column 112 slides down along the first guide slope 111. This sliding causes the lateral dimension (diameter) of the first molding column 110 and the second molding column 112 to actively shrink, thereby reducing the contact area and clamping force between the molding block 109 and the cured silicone part. The demolding force is greatly reduced, and the thin-walled area no longer needs to bear excessive ejection force, significantly reducing the risk of breakage.

[0039] This utility model's injection mold for irregularly shaped silicone parts ensures precise mold opening and closing through the sliding engagement of the guide shaft 105 with the mold core guide hole 106 and the upper mold guide hole 107. Simultaneously, the molding block 109 employs a sliding guide slope design with the first molding pillar 110 and the second molding pillar 112, causing the transverse diameter to actively shrink during demolding. This effectively reduces ejection and sticking phenomena during the demolding process of thin-walled irregularly shaped parts, optimizing product molding quality. This simplifies the complexity of traditional multi-component demolding mechanisms, significantly improving production efficiency and operational convenience. It offers multiple beneficial effects, including a substantial increase in demolding success rate, significantly improved product quality, and enhanced overall production efficiency.

[0040] In this embodiment of the present invention, a T-shaped first guide groove 118 is provided on the first guide inclined surface 111, and a T-shaped block 117 that slides in the first guide groove 118 is fixed on the second guide inclined surface 113.

[0041] This utility model's injection mold for irregularly shaped silicone parts achieves high-precision, strongly constrained guidance for the movement of the second molding column 112 relative to the first molding column 110 by opening a T-shaped first guide groove 118 on the first guide slope 111 and fixing a T-shaped block 117 on the second guide slope 113 for sliding engagement. This completely eliminates the risk of radial offset or derailment that may exist in simple slope engagement, ensuring that the second molding column 112 retracts radially inward stably and smoothly along a predetermined trajectory during demolding. This rigid T-groove-block interlocking structure significantly enhances the lateral force resistance and overall structural rigidity of the sliding components, effectively withstanding the high-pressure impact during injection molding and the mechanical stress of repeated mold opening and closing, preventing engagement failure or precision reduction due to deformation, thereby greatly improving the reliability and durability of the demolding mechanism in long-term production. At the same time, this design simplifies the manufacturing and assembly process and provides easy maintenance or replacement for key sliding pairs, ultimately ensuring the high stability and repeatability of the demolding action of irregularly shaped thin-walled silicone parts, further consolidating the mold's high-efficiency production capacity and product yield.

[0042] In this embodiment of the present invention, the first guide groove 118 is formed at the upper end of the first guide inclined surface 111, and the lower end opening of the second adjustment groove 115 is formed at the lower end of the first guide inclined surface 111.

[0043] The injection mold for the irregularly shaped silicone part of this utility model achieves spatial separation and synergistic optimization of key functional areas by precisely positioning the first guide groove 118 at the upper end of the first guide slope 111, and simultaneously setting the lower opening of the second adjustment groove 115 at the lower end of the first guide slope 111. The upper first guide groove 118 ensures the initial stability and trajectory accuracy of the radial shrinkage movement, significantly reducing the risk of tearing during the demolding stage of thin-walled parts; while the lower opening of the second adjustment groove 115 allows the pressure provided by the pressure regulating component 116 to directly act on the lower end of the second molding column 112, making the relative sliding between the first molding column 110 and the second molding column 112 more convenient.

[0044] In this embodiment of the present invention, an elastic element 119 is installed in the first guide groove 118. One end of the elastic element 119 abuts against the lower side wall of the first guide groove 118, and the other end of the elastic element 119 abuts against the lower end face of the T-shaped block 117.

[0045] The injection mold for the irregularly shaped silicone parts of this utility model incorporates an elastic element 119 within the first guide groove 118. This elastic element 119 abuts against the bottom of the groove at its lower end and presses against the bottom of the T-block 117 at its upper end. This elastic pre-tightening design completely eliminates the assembly gap between the T-block 117 and the first guide groove 118, ensuring that the second molding column 112 maintains zero-shaking rigid support under high-pressure injection molding conditions. This effectively avoids cumulative damage from micro-displacement caused by vibration or pressure fluctuations. During the mold opening and demolding stage, the rebound force of the elastic element 119 actively propels the T-block 117 upward along the guide groove, significantly reducing the starting torque of the radial contraction movement of the second molding column 112. This makes the separation action of the thin-walled silicone parts at the initial moment of demolding smoother and faster, greatly reducing the risk of tearing of the thin-walled structure due to sudden stress release. Simultaneously, the elastic element 119 allows the T-block 117 to self-reset during repeated movements, further improving the continuous stability and yield rate of the production of irregularly shaped thin-walled parts.

[0046] In this embodiment of the utility model, gray cast iron contact surfaces 120 are respectively provided between the first guide inclined surface 111 and the second guide inclined surface 113;

[0047] The injection mold for irregularly shaped silicone parts of this utility model significantly optimizes tribological properties by adding a gray cast iron abutment layer to the sliding mating surface of the first guide slope 111 and the second guide slope 113. The high wear resistance and excellent oil storage characteristics of gray cast iron greatly reduce the wear rate of the inclined sliding pair during repeated demolding movements, extending the service life of key moving components. Its inherent damping and shock absorption effect effectively absorbs the impact of mold opening and closing and the fluctuation of injection pressure, suppresses the micro-displacement caused by vibration, and ensures the long-term stability of the radial shrinkage trajectory of the second molding column 112. At the same time, the self-lubricating property of gray cast iron reduces the dependence on additional lubricants, avoids oil contamination of silicone products, and forms a stress buffer system with rigidity and flexibility in conjunction with the elastic element 119, making the demolding process of thin-walled parts smoother and more controllable. Ultimately, it maintains the stability of dimensional accuracy and surface quality of irregularly shaped silicone parts in high-speed continuous production, while reducing the frequency of mold maintenance and overall costs.

[0048] In this embodiment of the present invention, the mold core is provided with a lower molding groove 121 that aligns with the molding chamber 108, and a rubber soft ring 122 that abuts against the first molding post 110 and the second molding post 112 is installed in the lower molding groove 121.

[0049] The injection mold for irregularly shaped silicone parts of this utility model adds a rubber soft ring 122 to the molding groove of the mold core, which abuts against the double molding pillars. The elastic sealing characteristics of the soft ring tightly fill the microscopic gap between the molding pillars and the lower mold when the mold is closed, completely eliminating the problem of overflow and flash caused by molten silicone seeping into the gap, and ensuring the clarity of the outline of the thin-walled irregularly shaped parts. Its high compression resilience can evenly absorb the impact stress transmitted by the double pillars during the high-pressure injection stage, preventing rigid contact from damaging the fragile structure at the bottom of the silicone part, and significantly reducing the risk of cracking in the thin-walled area.

[0050] In this embodiment of the present invention, the molding chamber 108 is provided with a plurality of chambers, and the upper end face of the mold core 103 is provided with an integrated flow channel 123 that is respectively connected to each molding chamber 108.

[0051] This utility model relates to an injection mold for irregularly shaped silicone parts. By setting multiple molding chambers 108 and opening an integrated runner 123 connecting each chamber on the upper end face of the mold core 103, the design allows multiple irregularly shaped silicone parts to be molded simultaneously in a single injection cycle, significantly increasing production capacity. The runner 123 adopts a top layout and a direct connection structure with the chambers, ensuring synchronous and uniform filling of multiple cavities and effectively eliminating problems such as short shots or uneven density in thin-walled areas caused by flow imbalance. At the same time, the integrated runner facilitates centralized control of temperature and shear heat, reduces the risk of cold material retention, and ensures the consistency of internal quality of each product.

[0052] In this embodiment of the present invention, the pressure regulating component 116 includes a cylinder or a hydraulic cylinder;

[0053] The injection mold for the irregular silicone part of this utility model specifically defines the pressure regulating component 116 as a cylinder or hydraulic cylinder. This power actuator can accurately control the pressure acting on the second molding column 112 in real time according to the preset program or sensor feedback. Its powerful linear output force ensures that the cavity pressure is maintained continuously, stably and quantifiable during the demolding stage, making the sliding of the second molding column 112 on the first molding column 110 more stable.

[0054] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An injection mold for a profiled silicone piece, characterized in that, It includes an upper template (101), a lower mold base (102), and a mold core (103) disposed between the upper template (101) and the lower mold base (102); The lower mold base (102) is fixedly provided with a guide shaft (105), and the mold core (103) and the upper mold plate (101) are respectively provided with a mold core guide hole (106) and an upper mold guide hole (107) that slide and fit on the guide shaft (105). The mold core (103) has a molding chamber (108) and the lower end face of the upper template (101) has a molding block (109) that is inserted into the molding chamber (108) for product molding. The molding block (109) includes a first molding column (110) fixed to the lower end face of the upper template (101), a first guide slope (111) is provided on the first molding column (110), a second molding column (112) is provided on the first guide slope (111), and a second guide slope (113) is provided on the second molding column (112) to slide and abut against the first guide slope (111). The upper template (101) is provided with a first adjustment groove (114) that runs through the top and bottom, and the first forming column (110) is provided with a second adjustment groove (115) that communicates with the first adjustment groove (114). The first adjustment groove (114) is provided with a pressure regulating component (116).

2. The injection mold for a profiled silicone piece according to claim 1, characterized in that The first guide slope (111) is provided with a T-shaped first guide groove (118), and the second guide slope (113) is fixed with a T-shaped block (117) that slides in the first guide groove (118).

3. The injection mold for a profiled silicone piece according to claim 2, characterized in that The first guide groove (118) is opened at the upper end of the first guide slope (111), and the lower end opening of the second adjustment groove (115) is opened at the lower end of the first guide slope (111).

4. The injection mold for a profiled silicone piece according to any one of claims 2-3, characterized in that, An elastic element (119) is installed in the first guide groove (118). One end of the elastic element (119) abuts against the lower side wall of the first guide groove (118), and the other end of the elastic element (119) abuts against the lower end face of the T-block (117).

5. The injection mold for an irregularly shaped silicone part according to claim 4, characterized in that, A gray cast iron contact surface (120) is provided between the first guide slope (111) and the second guide slope (113).

6. The injection mold for a profiled silicone piece according to claim 1, characterized in that The mold core is provided with a lower molding groove (121) that aligns with the molding chamber (108). The lower molding groove (121) is provided with a rubber soft ring (122) that abuts against the first molding post (110) and the second molding post (112).

7. The injection mold for a profiled silicone piece according to claim 6, characterized in that The molding chamber (108) is provided in multiple ways, and the upper end face of the mold core (103) is provided with flow channels (123) that are respectively connected to each molding chamber (108).

8. The injection mold for a profiled silicone piece according to claim 7, characterized in that The pressure regulating component (116) includes a cylinder or a hydraulic cylinder.

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