A convenient demolding injection mold for automobile parts injection molding

Abstract

The application relates to a convenient demolding injection mold for automobile parts injection molding, which comprises a movable mold and a fixed mold, and further comprises a first demolding layer, a second demolding layer, a vacuum pumping device and a gas supply device. The first demolding layer and the second demolding layer are both prefabricated integrated flexible layered structures, each comprising a flexible pipe network, an elastic sleeve and a breathable isolation layer. The flexible pipe network is distributed in a net shape or a serpentine shape, and a through hole is formed on each flexible pipe and faces the surface of the mold cavity; the elastic sleeve is sleeved on the outer wall of the flexible pipe and has an axial opening, one side of which is fixed to the outer wall of the flexible pipe, and the other side is a free end; the breathable isolation layer covers and is fixed to the top of the elastic sleeve, and has communicating micropores in the inside. The flexible pipe is flattened by vacuum pumping before injection molding, and the elastic sleeve wall is attached to block the through hole; when demolding, high-pressure gas is introduced to expand and open the elastic sleeve to form a gas gap, the gas enters the communicating micropores through the through hole and the gas gap, uniformly penetrates from the forming surface to form an air cushion, and the product is separated without damage.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and in particular to an injection mold for easy demolding of automotive parts. Background Technology

[0002] In the field of automotive parts injection molding, large thin-walled parts such as door panels, dashboards, and bumpers have always been challenging in mold design due to their high appearance requirements, complex curved shapes, and large demolding clamping forces. Currently, the mainstream ejector pin or ejector rod mechanical ejection methods have significant shortcomings: the ejection force is concentrated in a few point areas, which can easily cause ejection whitening, ejection marks, or even cracks on the product surface; at the same time, the large core surface area of ​​large thin-walled parts means that the product is subjected to uneven force during mechanical ejection, which can easily cause dents and overall twisting deformation.

[0003] To address the aforementioned issues, existing technologies have introduced solutions that use air blowing to assist or replace mechanical ejection. For example, utility model patent CN202480321U discloses an air-blowing ejection mold, which has a guide hole through the cavity in the mold core, and an air-blowing ejection tube inside the guide hole. By supplying high-pressure gas to the air-blowing ejection tube, it is ejected along the guide hole and sprays high-pressure gas, thus ejecting thin-walled products by air blowing.

[0004] However, this solution still has the following shortcomings: First, the air ejector tube is a point ejection element, and the gas is concentrated from a single nozzle, so the demolding force is concentrated in a local area, which can easily cause uneven stress and local deformation for large thin-walled parts; Second, this solution requires the machining of guide holes on the mold core to accommodate the air ejector tube, which damages the integrity of the mold cavity surface. The fit gap between the guide hole and the air ejector tube may also become a channel for molten material to overflow, increasing the risk of blockage.

[0005] How to achieve air flotation demolding while ensuring reliable opening and closing of the air passage with a simple structure, fundamentally eliminating the risk of blockage, and ensuring uniform gas permeation from the entire molding surface remains an urgent problem to be solved. Summary of the Invention

[0006] To address the issues of product damage and airway blockage in existing demolding technologies, this application provides an injection mold for easy demolding of automotive parts, employing the following technical solution: An injection mold for easy demolding of automotive parts includes a moving mold and a fixed mold, and further includes: The first release layer is laid on the cavity surface of the moving mold; The second release layer is laid on the cavity surface of the fixed mold; Both the first and second release layers are prefabricated, integral, flexible layered structures, each comprising: The flexible pipe network is distributed in a mesh or serpentine pattern, and each flexible pipe has multiple through holes facing the surface of the mold cavity; An elastic sleeve is fitted onto the outer wall of each flexible tube. It has an axial opening, with one side of the opening fixed to the outer wall of the flexible tube and the other side of the opening being a free end. A breathable insulating layer covers and is fixed to the top of the elastic sleeve, and has interconnected micropores inside, with its upper surface forming a molded surface; A vacuum device, connected to the flexible pipe network, is used to flatten the flexible pipe before injection molding. The wall of the elastic sleeve is attached to the outer wall of the flexible pipe and blocks the through hole. The gas supply device is connected to the flexible pipe network and is used to introduce high-pressure gas into the flexible pipe during demolding to make it expand and open the elastic sleeve. An air outlet gap is formed between the inner wall of the sleeve and the outer wall of the flexible pipe. The gas enters the interconnected micropores of the breathable isolation layer through the through hole and the air outlet gap, and seeps out evenly from the molding surface to form an air cushion, so that the product is separated from the mold.

[0007] Furthermore, the breathable insulating layer and the elastic sleeve are fixed together by heat pressing or bonding, and the flexible pipe network and the elastic sleeve are partially embedded inside the breathable insulating layer.

[0008] Furthermore, the elastic sleeve is a C-shaped sleeve with a C-shaped cross-section; the opening side fixed to the outer wall of the flexible tube is the fixed side, and the other opening side is the free side; under vacuum conditions, the tube wall connected to the free side adheres to the outer wall of the flexible tube and blocks the through hole; under ventilated expansion conditions, the free side is opened, and the air outlet gap is formed between the inner surface of the tube wall and the outer wall of the flexible tube.

[0009] Furthermore, the through holes are arranged at intervals along the axial direction of the flexible tube, and their opening positions correspond to the tube wall area where the free edge is attached.

[0010] Furthermore, an annular groove is formed on the cavity surface of the moving mold and / or the edge of the cavity surface of the fixed mold, and a rim is pre-formed on the edge of the first or second demolding layer, the rim being embedded in the annular groove.

[0011] Furthermore, a pressure plate is provided above the annular groove. The pressure plate is an annular plate that can be detachably installed on the surface edge of the moving mold or the fixed mold. An elastic sealing ring is provided between the pressure plate and the edge ring. The pressure plate is used to limit the maximum displacement of the edge ring away from the mold cavity surface from the side.

[0012] Furthermore, an isolation ring is provided on the side of the edge ring away from the mold cavity, and the shape of the isolation ring is consistent with that of the edge ring; after the edge ring is installed, the isolation ring abuts against the inner wall of the pressure plate to prevent the injection molding agent from contacting the elastic sealing ring.

[0013] Furthermore, the vacuuming device works in conjunction with the gas supply device to circulate cooling gas into the flexible pipe network. The pressure of the cooling gas is lower than the minimum pressure required to open the elastic sleeve, so that the cooling gas circulates and exchanges heat in the channels formed by the flexible pipe, through holes, gas outlet gaps and connecting micropores, without opening the elastic sleeve.

[0014] Furthermore, it also includes: Also includes: The support frame, on which the fixed mold is horizontally mounted; The first driving component is rotatably connected to the bracket. The moving mold is mounted on the first driving component. The moving mold rotates with the first driving component to above the fixed mold. The first driving component drives the moving mold to close with the fixed mold.

[0015] In summary, the beneficial technical effects of this application are as follows: 1. The injection mold for easy demolding of automotive parts designed in this application has an integrated demolding layer composed of a prefabricated flexible pipe network, elastic sleeve and breathable isolation layer. During demolding, gas seeps out evenly from the molding surface to form a continuous air cushion, realizing non-contact separation of the entire surface of the product, and completely eliminating the whitening, ejection marks and product deformation caused by traditional ejector pins.

[0016] 2. The injection mold for easy demolding of automotive parts designed in this application uses a flexible sleeve with one side fixed and the other side free. With the help of vacuuming, the outer wall of the flexible tube is made to fit and block the through hole. When air is introduced, the expansion of the flexible sleeve opens the through hole, realizing the mechanical and reliable opening and closing of the air passage. This eliminates the problem of material blocking the pipeline during the prefabrication and injection molding process from the root.

[0017] 3. The injection mold for easy demolding of automotive parts designed in this application uses a delayed pressure storage structure composed of a side ring, a pressure plate and an elastic sealing ring. First, the vacuum adsorption between the isolation layer and the mold surface is broken by the pressure storage top thrust, and then air flotation separation is performed. This avoids the problem of insufficient demolding force or uneven force caused by direct air release. The demolding action sequence is controllable, stable and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an injection mold for easy demolding of automotive parts according to an embodiment of this application; Figure 2 This is a schematic diagram of the mold parting state of an injection mold for easy demolding of automotive parts according to an embodiment of this application; Figure 3 yes Figure 2 This application provides a partial structural cross-sectional view of an injection mold for easy demolding of automotive parts, according to an embodiment of the present application. Figure 4This is a partial structural schematic diagram of an injection mold for easy demolding of automotive parts according to an embodiment of this application, intended to show the first demolding layer; Figure 5 This is a partial structural schematic diagram of an injection mold for easy demolding of automotive parts according to an embodiment of this application; Figure 6 yes Figure 5 This sectional view is intended to show the internal piping connections. Figure 7 yes Figure 5 An enlarged diagram of section A is intended to show the flattening state of the flexible tube; Figure 8 yes Figure 7 Another schematic diagram is shown to illustrate the flexible tube in its expanded state.

[0019] Explanation of reference numerals in the attached figures: 01. Molding cavity; 1. Moving mold; 11. Annular groove; 12. Pressure plate; 13. Elastic sealing ring; 14. Injection tube; 15. Exhaust pipe; 2. Fixed mold; 3. First demolding layer; 31. Flexible pipe network; 311. Flexible tube; 312. Through hole; 32. Elastic sleeve; 33. Breathable isolation layer; 34. Edge ring; 341. Isolation ring; 4. Second demolding layer; 5. Vacuum pump; 6. Air supply device; 7. Support; 71. First driving component. Detailed Implementation

[0020] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] This application discloses an injection mold for easy demolding of automotive parts.

[0022] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8This application provides an injection mold for easy demolding of automotive parts, comprising a moving mold 1 and a fixed mold 2, and further comprising a first demolding layer 3, a second demolding layer 4, a vacuum device 5, and an air supply device 6. The first demolding layer 3 is laid on the cavity surface of the moving mold 1; the second demolding layer 4 is laid on the cavity surface of the fixed mold 2. Both the first demolding layer 3 and the second demolding layer 4 are prefabricated integral flexible layered structures. Each of the first demolding layer 3 and the second demolding layer 4 includes a flexible tube 311 mesh 31, an elastic sleeve 32, and a breathable isolation layer 33. The flexible tube 311 mesh 31 is distributed in a mesh or serpentine pattern, and each flexible tube 311 has multiple through holes 312 facing the mold cavity surface. The elastic sleeve 32 is sleeved on the outer wall of each flexible tube 311, and has an axial opening, with one open side fixed to the flexible tube. The outer wall of 311 and the opening on the other side are free ends; the breathable isolation layer 33 covers and is fixed above the elastic sleeve 32, and has interconnecting micropores inside, with the upper surface forming the molding surface; the vacuum device 5 is connected to the flexible tube 311 mesh 31, and is used to make the flexible tube 311 flat before injection molding, with the tube wall of the elastic sleeve 32 adhering to the outer wall of the flexible tube 311 and sealing the through hole 312; the air supply device 6 is connected to the flexible tube 311 mesh 31, and is used to introduce high-pressure gas into the flexible tube 311 during demolding to make it expand, expand the elastic sleeve 32, and form an air outlet gap between the inner wall of the sleeve and the outer wall of the flexible tube 311. The gas enters the interconnecting micropores of the breathable isolation layer 33 through the through hole 312 and seeps out evenly from the molding surface to form an air cushion, so that the product is separated from the mold.

[0023] Based on the above structure, the workflow of the equipment in this application is as follows: Before injection molding, the pre-fabricated integrated first release layer 3 is laid on the cavity surface of the moving mold 1, and the second release layer 4 is laid on the cavity surface of the fixed mold 2. The vacuum device 5 is activated to perform vacuum treatment on the flexible tube 311 mesh 31. Under atmospheric pressure or negative pressure, each flexible tube 311 is flattened. At this time, the tube wall connected to the free end of the elastic sleeve 32 is tightly attached to the outer wall of the flexible tube 311, completely sealing the multiple through holes 312 opened on the flexible tube 311, and the entire pipeline system is closed to the outside. Subsequently, the moving mold 1 and the fixed mold 2 are closed, and the molten plastic is injected into the mold cavity, forming the desired product on the molding surface of the breathable isolation layer 33. After cooling, the mold is opened, and the gas supply device 6 introduces high-pressure gas into the flexible tube 311 mesh 31. The flexible tube 311 gradually expands from a flat state, stretching the elastic sleeve 32. This causes the permeable isolation layer 33 to first separate from the mold surface. When the free end of the elastic sleeve 32 is pushed away from the outer wall of the flexible tube 311, an air outlet gap is formed between the inner surface of the tube wall and the outer wall of the flexible tube 311. The through hole 312 then opens, and the high-pressure gas separates the permeable isolation layer 33 entirely from the mold surface. Subsequently, some gas enters the connecting micropores of the permeable isolation layer 33 and seeps out evenly from the entire molding surface, forming a continuous and uniform air cushion between the product and the molding surface. The product is then smoothly lifted and completely separated from the release layer. After the product is removed, the gas supply is stopped, and the flexible tube 311 is flattened by the vacuum device 5. The wall of the elastic sleeve 32 re-attaches to the outer wall of the flexible tube 311 and seals the through hole 312, thus completing a full injection molding cycle.

[0024] Compared with existing technologies, this application replaces the traditional point-contact ejection method by uniformly permeating gas through the entire surface of the breathable isolation layer 33 to form a continuous air cushion. When traditional ejectors directly eject the product, the concentrated force of point contact is required to overcome the huge static friction between the bottom surface of the product and the mold surface. This head-on confrontation is prone to causing ejection whitening, ejection marks, ejection cracks, and product deformation. In this application, the pressure generated by the expansion of the flexible tube 311 first pushes the entire breathable isolation layer 33 to separate from the mold surface, breaking down the friction basis between the product and the mold. This shifts the source of demolding resistance from the product body to the space between the isolation layer and the mold. After the isolation layer separates from the mold, the gas uniformly permeating through the interconnected micropores forms a continuous air cushion between the product and the isolation layer, achieving contactless separation of the product. The product itself no longer bears the concentrated ejection force, fundamentally avoiding local deformation caused by uneven force. This is especially suitable for injection molding demolding of large, thin-walled parts with high appearance requirements, such as automotive door panels, dashboards, and bumpers. During the prefabrication of the release layer, a vacuum is applied to flatten the flexible tube 311, causing its outer wall to adhere to the wall of the elastic sleeve 32, forming a mechanical seal. This eliminates the possibility of layer material entering the pipeline, ensuring the stable and reliable quality of the prefabricated release layer. During demolding, the flexible tube 311 expands, opening the elastic sleeve 32, and the through hole 312 opens accordingly, making the opening and closing of the air outlet completely controllable. Both the first release layer 3 and the second release layer 4 of this application are prefabricated, integrated flexible layered structures. This eliminates the need for drilling holes or creating air passages in the mold steel, does not alter the mold's structure, and is suitable for upgrading existing molds. Damaged release layers can be replaced entirely, resulting in low maintenance costs.

[0025] Reference Figure 5 , Figure 6 , Figure 7 and Figure 8In this application, the breathable isolation layer 33 and the elastic sleeve 32 are fixedly connected by hot pressing or bonding, and the flexible tube 311 mesh 31 and the elastic sleeve 32 are partially embedded inside the breathable isolation layer 33. During prefabrication, the flexible tubes 311, which have been fixed with elastic sleeves 32, are first woven or arranged into a mesh or serpentine network. Then, the flexible tubes 311 network 31 are vacuumed to flatten each flexible tube 311. The tube wall connected to the free end of the elastic sleeve 32 is tightly attached to the outer wall of the flexible tube 311, and the through hole 312 is completely blocked. While maintaining the vacuum (the flat state is easy to place and stable), the material of the breathable isolation layer 33 is covered on the flexible tubes 311 by hot pressing or coating, so that the elastic sleeve 32 and the flexible tubes 311 network 31 are semi-embedded in the breathable isolation layer 33 and fixed together. At this time, since the through hole 312 is blocked, the layer material cannot enter the pipeline, ensuring the unobstructed flow of the pipeline. After the breathable isolation layer 33 is cured and formed, the vacuum is stopped, and an integrated demolding layer containing the flexible tubes 311 network 31, elastic sleeves 32 and breathable isolation layer 33 is obtained. The purpose of this design is to integrate the flexible tube 311 mesh 31, the elastic sleeve 32, and the breathable isolation layer 33 into a single unit, so that the demolding layer forms an inseparable integrated structure during the prefabrication stage, with each layer tightly bonded and without relative displacement. During repeated vacuuming and inflation cycles, the opening and closing of the elastic sleeve 32 will not cause peeling or delamination between the breathable isolation layer 33 and the elastic sleeve 32, ensuring that gas can stably and directionally enter the interconnected micropores of the breathable isolation layer 33 after the air outlet gap is formed. At the same time, the semi-embedded design allows the elastic sleeve 32 to be partially embedded inside the breathable isolation layer 33, ensuring the flatness of the molded surface of the breathable isolation layer 33 and providing sufficient gas flow interface between the elastic sleeve 32 and the breathable isolation layer 33. After the gas escapes from the air outlet gap, it can quickly diffuse into the entire microporous network of the breathable isolation layer 33, uniformly seeping out from the molded surface to form an air cushion, thereby ensuring the uniformity and reliability of demolding.

[0026] Reference Figure 6 , Figure 7 and Figure 8In this application, to achieve reliable sealing and controllable opening of the through hole 312, the elastic sleeve 32 is configured as a C-shaped sleeve with a C-shaped cross-section; the opening side fixed to the outer wall of the flexible tube 311 is the fixed side, and the other opening side is the free side. The purpose of this configuration is that: under vacuum conditions, the flexible tube 311 is in a flat state, and the tube wall connected to the free side is tightly attached to the outer wall of the flexible tube 311 under its own elasticity and external pressure, mechanically sealing the through hole 312, thus eliminating the possibility of the layer material entering the pipeline during the prefabrication of the demolding layer; under ventilated expansion conditions, the expansion of the flexible tube 311 opens the free side, forming an air outlet gap between the inner surface of the tube wall and the outer wall of the flexible tube 311, and the through hole 312 opens accordingly, allowing gas to escape stably through the through hole 312 and the air outlet gap. With the C-shaped sleeve having a single-sided fixed and single-sided free structure, the closing and opening of the through hole 312 is completely controlled by the flat and expanded state of the flexible tube 311, without the need for additional valves or control mechanisms. The structure is simple and the operation is reliable.

[0027] Reference Figure 6 , Figure 7 and Figure 8 In this application, to ensure that the through holes 312 can be reliably sealed under vacuum and smoothly opened under gas expansion, the through holes 312 are arranged at intervals along the axial direction of the flexible tube 311, and their positions correspond to the tube wall area where the free edge is attached. The purpose of this arrangement is that the through holes 312 are concentrated in the attachment area of ​​the free edge tube wall. During vacuuming, the free edge tube wall is tightly attached to the outer wall of the flexible tube 311, ensuring that all through holes 312 in this area are completely covered and sealed at once, without any risk of omission or partial sealing. During gas expansion, the free edge is opened, and the through holes 312 in this area open simultaneously. Gas escapes evenly along the axial direction of the flexible tube 311 and enters the gas outlet gap, then diffuses through the interconnected micropores of the breathable isolation layer 33 to the entire forming surface, ensuring uniform gas output. Simultaneously, the axially spaced arrangement of the through holes 312 avoids localized weakening of the flexible tube 311 caused by concentrated openings, ensuring the structural integrity and service life of the flexible tube 311 during repeated vacuuming and gas filling cycles.

[0028] Reference Figure 3In this application, to achieve reliable positioning and fixation of the release layer on the mold cavity surface, an annular groove 11 is provided on the edge of the cavity surface of the moving mold 1 and / or the cavity surface of the fixed mold 2. A rim 34 is pre-formed on the edge of the first release layer 3 or the second release layer 4, and the rim 34 is embedded in the annular groove 11. The purpose of this arrangement is that the rim 34 is integrally connected to the edge of the release layer during the pre-forming stage. When laying the release layer, simply embedding the rim 34 into the corresponding annular groove 11 achieves rapid positioning and accurate laying of the release layer on the mold cavity surface, simplifying operation and ensuring high repeatability. Simultaneously, the interlocking fit between the annular groove 11 and the rim 34 provides peripheral constraint to the release layer, preventing overall displacement or edge lifting of the release layer due to molten material impact or gas pressure during injection molding and demolding, thus ensuring the flatness of the molding surface and the stability of the demolding function. The edge ring 34 also serves as a connecting carrier for the subsequent sealing structure, providing a supporting foundation for the installation of the pressure plate 12 and the elastic sealing ring 13.

[0029] Reference Figure 3 In this application, in order to achieve the delayed pressure storage function in the early stage of demolding, a pressure plate 12 is provided above the annular groove 11. The pressure plate 12 is an annular plate that can be detachably installed on the surface edge of the moving mold 1 or the fixed mold 2. In this application, it is fixed by bolts. An elastic sealing ring 13 is provided between the pressure plate 12 and the edge ring 34. The pressure plate 12 is used to limit the maximum displacement of the edge ring 34 away from the mold cavity surface from the side. The injection port is opened on the pressure edge, and the two pressure edges are combined to form a complete injection port. The purpose of this design is as follows: during demolding, the air supply device 6 introduces high-pressure gas into the flexible tube 311 mesh 31. The gas pressure first pushes the demolding layer and the edge ring 34 away from the mold cavity surface and compresses the elastic sealing ring 13. The elastic sealing ring 13 forms a seal between the edge ring 34 and the pressure plate 12 to prevent gas from escaping from the edge of the demolding layer. This allows the gas pressure to continuously accumulate in the space below the pipeline and the isolation layer, forming a pressure storage delay. When the edge ring 34 moves to the limit position defined by the pressure plate 12, a gap is formed between the demolding layer and the mold surface. The flexible tube 311 continues to expand and open the elastic sleeve 32. The through hole 312 opens, and the gas enters the interconnecting micropores of the breathable isolation layer 33 and seeps out evenly from the molding surface to form an air cushion, thus achieving air flotation separation of the product. The structure divides the demolding process into two stages: pressure accumulating and top loosening, and opening and venting. In the pressure accumulating stage, the elastic sealing ring 13 ensures that the pressure accumulates to break the vacuum adsorption between the isolation layer and the mold surface. In the venting stage, the gas seeps upward through the micropores instead of leaking from the edge. The two stages are functionally independent and time-coordinated, making the demolding action stable and reliable.

[0030] Reference Figure 1 and Figure 3In this application, the moving mold 1 is provided with multiple injection tubes 14 and multiple venting pipes 15. Both the injection tubes 14 and the venting pipes 15 extend from the moving mold 1 and pass through the edge ring 34 of the second demolding layer 4 into the molding cavity. The purpose of this arrangement is that the multiple injection tubes 14 are distributed along the cavity, and the molten plastic is injected synchronously from multiple points onto the molding surface, shortening the flow path of the molten material in the cavity, which is beneficial for the rapid and uniform filling and molding of large thin-walled parts; the multiple venting pipes 15 are correspondingly distributed in various areas of the cavity, and the gas in the cavity is discharged in time during the injection process to prevent product defects caused by trapped gas.

[0031] During injection molding, molten plastic enters the molding cavity simultaneously through multiple injection tubes 14, flows multidirectionally on the molding surface of the breathable isolation layer 33, and quickly fills the entire cavity. The gas originally in the cavity is discharged from multiple vent pipes 15 as the molten material advances. At this time, because the wall of the elastic sleeve 32 adheres to the outer wall of the flexible tube 311, blocking the through hole 312, the molten plastic cannot enter the inside of the tube. After injection molding is completed, the pressure holding and cooling stage begins, and the product cools and solidifies on the molding surface. The subsequent demolding process is as described above.

[0032] Reference Figure 3 In this application, to prevent the injection molding agent from intruding into the elastic sealing ring 13 during injection molding and causing sealing failure, an isolation ring 341 is also provided on the side of the edge ring 34 away from the mold cavity. The shape of the isolation ring 341 is consistent with that of the edge ring 34. After the edge ring 34 is installed, the isolation ring 341 abuts against the inner wall of the pressure plate 12 to prevent the injection molding agent from contacting the elastic sealing ring 13. The purpose of this arrangement is that during injection molding, the molten plastic flows in the cavity and may seep into the annular groove 11 area along the edge of the demolding layer. Once it comes into contact with the elastic sealing ring 13, it will cause corrosion, aging, or adhesion failure of the sealing ring, affecting the delayed pressure storage function. The isolation ring 341 forms a physical barrier between the edge ring 34 and the inner wall of the pressure plate 12, blocking the injection molding agent outside the elastic sealing ring 13, ensuring that the elastic sealing ring 13 is in a stable working environment for a long time, extending the service life of the sealing ring, and ensuring long-term reliable demolding sequence control.

[0033] Reference Figure 3 In this application, to eliminate the influence of the annular gap formed between the isolation ring 341 and the pressure plate 12 on the flatness of the molding cavity surface, the end of the isolation ring 341 away from the edge ring 34 is flush with the side of the pressure plate 12 away from the mold, and the inner side of the isolation ring 341 is flush with the surface of the molding cavity. After mold closing, the two isolation rings 341 abut against each other and their end faces are flush, maintaining the flatness of the molding cavity surface during injection molding; during demolding, the moving mold 1 first moves upward, creating a gap between the two isolation rings 341 for the demolding layer to move, and the subsequent demolding process is as described above.

[0034] Reference Figure 1 and Figure 2 In this application, to improve the integration and automation level of the equipment, it also includes a bracket 7, a first driving component 71, a clamping device, and a shooting unit. The fixed mold 2 is horizontally mounted on the bracket 7; the first driving component 71 is rotatably connected to the bracket 7, and in this application, the first driving component 71 is rotated by a motor; the moving mold 1 is mounted on the first driving component 71, and the moving mold 1 rotates with the first driving component 71 to above the fixed mold 2, and the first driving component 71 drives the moving mold 1 to close with the fixed mold 2. In this application, the first driving component 71 is a cylinder.

[0035] The purpose of this design is as follows: The fixed mold 2 is installed horizontally with the cavity surface facing upwards, allowing operators to intuitively and conveniently lay the pre-made release layer on the cavity surface and adjust it into position without the need for vertical lifting or alignment operations, thus reducing the difficulty of installing and replacing the release layer. The moving mold 1 is mounted on the first drive component 71. The motor drives the first drive component 71 to rotate, and the moving mold 1 flips over to above the fixed mold 2. The first drive component 71 then drives the moving mold 1 to close, achieving automated control of the mold closing action. The flipping and closing actions are continuous and accurately positioned. After mold opening, the product flips over to the top with the moving mold 1, making it easy for personnel to directly remove the product from above, improving operational safety and production efficiency.

[0036] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "an," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection mold for easy demolding of automotive parts, comprising a moving mold (1) and a fixed mold (2), characterized in that, Also includes: The first release layer (3) is laid on the cavity surface of the moving mold (1); The second release layer (4) is laid on the cavity surface of the fixed mold (2); The first release layer (3) and the second release layer (4) are both prefabricated, integral, flexible layered structures, each comprising: The flexible tube (311) network (31) is distributed in a mesh or serpentine pattern, and each flexible tube (311) has multiple through holes (312) facing the surface of the mold cavity; An elastic sleeve (32) is fitted onto the outer wall of each flexible tube (311). It has an axial opening, with one side of the opening fixed to the outer wall of the flexible tube (311) and the other side of the opening being a free end. A breathable insulating layer (33) covers and is fixed above the elastic sleeve (32), and has interconnected micropores inside, with its upper surface forming a molded surface; A vacuum device (5) is connected to the flexible tube (311) mesh (31) and is used to make the flexible tube (311) flat before injection molding. The wall of the elastic sleeve (32) is attached to the outer wall of the flexible tube (311) and blocks the through hole (312). The gas supply device (6) is connected to the flexible tube (311) mesh (31) and is used to introduce high pressure gas into the flexible tube (311) during demolding to make it expand and open the elastic sleeve (32). An air outlet gap is formed between the inner wall of the sleeve and the outer wall of the flexible tube (311). The gas enters the communicating micropore of the breathable isolation layer (33) through the through hole (312) and the air outlet gap, and evenly seeps out from the molding surface to form an air cushion, so that the product is separated from the mold.

2. The injection mold for easy demolding of automotive parts according to claim 1, characterized in that, The breathable isolation layer (33) and the elastic sleeve (32) are fixedly connected by hot pressing or bonding, and the flexible tube (311) mesh (31) and the elastic sleeve (32) are partially embedded inside the breathable isolation layer (33).

3. The injection mold for easy demolding of automotive parts according to claim 2, characterized in that, The elastic sleeve (32) is a C-shaped sleeve with a C-shaped cross-section; the opening side fixed to the outer wall of the flexible tube (311) is the fixed side, and the other opening side is the free side; under vacuum conditions, the tube wall connected to the free side is attached to the outer wall of the flexible tube (311) and blocks the through hole (312); under ventilated expansion conditions, the free side is opened, and the air outlet gap is formed between the inner surface of the tube wall and the outer wall of the flexible tube (311).

4. The injection mold for easy demolding of automotive parts according to claim 3, characterized in that, The through holes (312) are arranged at intervals along the axial direction of the flexible tube (311), and the opening positions correspond to the tube wall area that the free edge is attached to.

5. The injection mold for easy demolding of automotive parts according to claim 4, characterized in that, The cavity surface of the moving mold (1) and / or the cavity surface edge of the fixed mold (2) are provided with an annular groove (11), and the edge of the first demolding layer (3) or the second demolding layer (4) is pre-made with a rim (34), which is embedded in the annular groove (11).

6. The injection mold for easy demolding of automotive parts according to claim 5, characterized in that, A pressure plate (12) is provided above the annular groove (11). The pressure plate (12) is an annular plate that can be detachably installed on the surface edge of the moving mold (1) or the fixed mold (2). An elastic sealing ring (13) is provided between the pressure plate (12) and the edge ring (34). The pressure plate (12) is used to limit the maximum displacement of the edge ring (34) away from the mold cavity surface from the side.

7. The injection mold for easy demolding of automotive parts according to claim 6, characterized in that... The side of the edge ring (34) away from the mold cavity is also provided with an isolation ring (341), the shape of which is consistent with that of the edge ring (34); after the edge ring (34) is installed, the isolation ring (341) abuts against the inner wall of the pressure plate (12) to prevent the injection molding agent from contacting the elastic sealing ring (13).

8. The injection mold for easy demolding of automotive parts according to claim 7, characterized in that, The vacuum device (5) works in conjunction with the gas supply device (6) to circulate cooling gas into the flexible pipe (311) network (31). The pressure of the cooling gas is lower than the minimum pressure required to open the elastic sleeve (32), so that the cooling gas flows and exchanges heat in the channel formed by the flexible pipe (311), through hole (312), gas outlet gap and connecting micropore, without opening the elastic sleeve (32).

9. The injection mold for easy demolding of automotive parts according to any one of claims 1-8, characterized in that, Also includes: The support (7) is used to mount the fixed mold (2) horizontally on the support (7); The first driving member (71) is rotatably connected to the bracket (7). The moving mold (1) is mounted on the first driving member (71). The moving mold (1) rotates with the first driving member (71) to above the fixed mold (2). The first driving member (71) drives the moving mold (1) to close with the fixed mold (2).

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