Injection-molding mold for soles based on elastomeric materials
By using vertically displaceable inserts and controllable damping structures in the shoe sole injection molding mold, the concave area is dynamically stretched, solving the problem of insufficient melt flow and achieving complete molding of the shoe sole.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGGUAN ZHANSHENG MOLD
- Filing Date
- 2026-03-02
- Publication Date
- 2026-06-02
AI Technical Summary
During the injection molding process of shoe soles, the melt flow in the concave area leads to insufficient filling of the sidewalls, especially in large shallow cavity areas, where the melt is difficult to completely fill the root of the ribs and the sidewalls, forming weld marks.
By employing vertically displaceable inserts and controllable damping structures, the downward movement of the inserts is controlled during the initial injection stage, dynamically stretching the concave area to ensure that the melt flows towards the sidewalls and rib roots in a low-viscosity state, achieving synchronous filling.
This solves the problem of insufficient filling of the sidewalls of the recessed area by the melt, ensuring the integrity and quality of the shoe sole injection molding and avoiding melt flow defects in traditional molds.
Smart Images
Figure CN122125870A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of injection molding equipment, specifically to shoe sole injection molding molds based on elastomeric materials. Background Technology
[0002] To meet performance requirements such as slip resistance, wear resistance, and cushioning, elastomer-based shoe soles typically feature dense anti-slip textures on their surfaces in contact with the ground. In injection molding, these anti-slip textures are formed by raised ribs within the mold cavity, while large recessed areas are created between the ribs. The current industry standard for mold design is that the geometry of the mold cavity perfectly mirrors the geometry of the finished product; that is, the mold cavity is pre-processed to the final depth and shape that perfectly matches the finished shoe sole when the mold is closed, and the melt fills the pre-designed cavity in one go during injection.
[0003] In the process of shoe sole molding and manufacturing, the applicant discovered that melt flow defects occur when processing large concave areas of the shoe sole. These large concave areas resemble "shallow dishes," with relatively shallow depths but large horizontal extension dimensions. When the melt enters this area, due to minimal flow resistance, it preferentially and quickly fills the bottom of the entire concave area. However, at this time, the vertical sidewalls and rib roots of the concave area are not completely filled. As the melt front in contact with the cold surface of the cavity cools down rapidly and its viscosity increases, subsequent melt cannot continue to climb upwards under limited holding pressure to fill the sidewalls and rib grooves. This results in material shortages on the sidewalls, shrinkage marks at the rib roots, and obvious weld lines at the melt confluence. This phenomenon can be summarized as "prioritizing filling of large areas, with insufficient filling of shrinkage in detailed areas." Summary of the Invention
[0004] This invention provides a shoe sole injection molding die based on elastomeric materials, which can realize dynamic stretching molding of the concave cavity during the injection process, fundamentally solving the problem of insufficient sidewall filling caused by the melt preferentially spreading to the bottom in a large area of shallow cavity.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] Injection molding dies for shoe soles based on elastomeric materials include:
[0007] An injection molding module and an electrical system; an outer mold frame mounted on the electrical system, wherein a fixed mold is detachably mounted within the outer mold frame; the fixed mold has a cavity for injection molding, the cavity including multiple ribs and a recessed area surrounded by them; an assembly groove is provided at the bottom of the cavity within the recessed area, an insert is slidably mounted on the inner wall of the assembly groove, a support structure is installed within the assembly groove, the support structure is located below the insert, and is used to support the insert and provide controllable damping resistance; wherein, during the injection stage, melt pressure acts on the top surface of the insert, and when the downward thrust generated by the pressure exceeds the damping resistance provided by the support structure, the insert is displaced downward in a controlled manner, thereby dynamically stretching the melt and forming the final recessed cavity depth; during the non-injection stage, the top surface of the insert is slightly lower than the top surface of the ribs.
[0008] Optionally, it also includes a gas-assisted assembly, which includes:
[0009] An air chamber is disposed inside the insert; one or more air outlet channels connect the air chamber to an external clean air source; a porous metal sintered breathable layer covers the top surface of the insert and is connected to the air chamber; a dense metal cover plate covers the porous metal sintered breathable layer and forms part of the top surface of the insert, the metal cover plate having multiple micro-holes, the diameter of the micro-holes being much smaller than the diameter of the porous metal sintered breathable layer; wherein, before the mold opening action is performed, the external clean air source escapes evenly to the top surface of the insert in sequence through the air outlet channels, the air chamber, the porous metal sintered breathable layer and the metal cover plate, forming an air film between the shoe sole and the top surface of the insert to break the vacuum adsorption state.
[0010] Optionally, the support structure includes a side support plate fixedly installed on the inner wall of the assembly slot. An assembly cover is slidably installed on the outer wall of the side support plate along the displacement path of the insert. An assembly plate is slidably installed inside the assembly cover. The sliding direction of the assembly plate is perpendicular to the sliding path of the insert. Two feedback links are hinged between the assembly plate and the outer wall of the side support plate. An adjustable damping element is installed between the outer wall of the assembly plate and the inner wall of the assembly cover. In the non-injection stage, the feedback links are in an inclined state. The feedback links have a breakout state, that is, the feedback links can change from the inclined state to the horizontal state. At this time, the downward pressure on the assembly cover reaches its maximum, and the top of the assembly cover contacts the bottom of the insert.
[0011] Optionally, the adjustable damping component includes a positioning plate slidably mounted on the inner wall of the assembly cover, multiple sets of damping springs fixedly mounted between the positioning plate and the assembly plate, a screw penetrating through the outer wall of the assembly cover, the screw being threadedly connected to the penetrating portion, the end of the screw penetrating the assembly cover being rotatably connected to the outer wall of the positioning plate, a pressure lug mounted on the top of the side support plate, the pressure lug abutting against the top outer wall of the assembly cover to limit the initial position of the assembly cover, and an isolation column fixedly mounted on the bottom of the insert, the bottom end of the isolation column being located above the top outer wall of the assembly cover.
[0012] Optionally, a hydraulic cylinder assembly is fixedly installed at the bottom of the assembly groove. In the injection state, the output end of the hydraulic cylinder assembly is not in contact with the outer wall of the bottom of the assembly cover. When the feedback linkage is in the breakthrough state, the output end of the hydraulic cylinder abuts against the outer wall of the assembly cover.
[0013] Optionally, an angle sensor is fixedly installed on the inner wall of the assembly cover, and the hinge shaft at the hinge end of the feedback link near the side support plate extends outward, and the angle sensor is connected to the hinge shaft via a coupling.
[0014] Optionally, the porous metal sintered permeable layer is made by powder metallurgy sintering and is integrally formed on the insert substrate. The average pore size of the porous metal sintered permeable layer is between five and fifty micrometers, the porosity is between 15% and 40%, and its overall thickness is between one and two millimeters.
[0015] Optionally, a track seat is fixedly installed on the outer wall of the assembly cover, and a guide rail groove is provided on the outer wall of the side support plate, forming a sliding assembly relationship between the track seat and the guide rail groove.
[0016] Optionally, the insert is coated with a fluoropolymer coating on the surface in contact with the melt, and the insert is coated with a nitride-aluminum-titanium hard coating on the surface in sliding contact.
[0017] This invention provides an injection molding die for shoe soles based on elastomeric materials, which has the following advantages compared to existing technologies:
[0018] This invention alters the filling dynamics of the melt by setting the molding surface of the recessed area as a vertically displaceable movable insert and configuring a support structure with controllable damping characteristics below it. In the initial injection stage, the top surface of the insert is preset to a position slightly lower than the top surface of the rib, making the recessed area present a "shallow cavity" state. The melt first spreads in this shallow cavity. At this time, due to the shallow cavity depth and short flow path, the temperature of the melt front edge remains good. As the injection pressure continues to rise and exceeds the damping threshold of the support structure, the insert begins to move downward at a controlled and uniform speed. The depth of the recessed area dynamically increases, and the melt layer already attached to the top surface of the insert is stretched downward synchronously. At the same time, it pushes the melt front edge to the side wall and the root of the rib for a "climbing" secondary flow. This process does not rely on passive feeding during the holding pressure stage, but rather actively induces the melt to flow in the vertical direction by increasing the cavity volume while the melt is still in the low viscosity and high fluidity filling stage. The downward movement of the insert has a positive closed-loop response to the injection pressure, ensuring that the cavity depth expansion speed matches the melt front advancement speed. Finally, when the holding pressure point is reached, the sidewalls and bottom of the recessed area are synchronously, uniformly, and fully filled, completely eliminating the paradox of "filling first and then missing" inherent in traditional static cavities. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the external three-dimensional structure of the injection molding equipment in this invention;
[0020] Figure 2 This is a three-dimensional structural diagram of the mold in this invention;
[0021] Figure 3 This is a three-dimensional structural diagram of the fixed mold in the prior art of this invention;
[0022] Figure 4 In this invention Figure 2 A top-down view;
[0023] Figure 5 For the present invention along Figure 4 A schematic diagram of the structure viewed in section AA;
[0024] Figure 6 This is a schematic diagram of a recessed region in the present invention;
[0025] Figure 7 This is a schematic diagram of the internal three-dimensional structure of the assembly groove in this invention;
[0026] Figure 8 This is a schematic diagram of the internal three-dimensional structure of the assembly groove from another perspective in this invention.
[0027] In the diagram: 1. Outer mold frame; 2. Fixed mold; 3. Mold cavity; 4. Insert; 5. Porous metal sintered breathable layer; 6. Assembly groove; 7. Side support plate; 8. Assembly cover; 9. Feedback linkage; 11. Assembly plate; 12. Positioning plate; 13. Isolation column; 14. Track seat; 15. Guide rail groove; 16. Pressure ear. Detailed Implementation
[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] Please see Figures 1 to 8 This invention provides a technical solution: an injection molding die for shoe soles based on elastomeric materials, comprising:
[0030] The injection module and electrical system; an outer mold frame 1 mounted on the electrical system, a fixed mold 2 detachably mounted inside the outer mold frame 1; the fixed mold 2 has a mold cavity 3 for injection molding, the interior of the mold cavity 3 includes multiple ribs and a recessed area surrounded by them; an assembly groove 6 is provided at the bottom of the inner part of the mold cavity 3 located in the recessed area, an insert 4 is slidably mounted on the inner wall of the assembly groove 6, a support structure is installed in the assembly groove 6, the support structure is located below the insert 4, used to support the insert 4 and provide controllable damping resistance; wherein, during the injection stage, the melt pressure acts on the top surface of the insert 4, when the downward thrust generated by the pressure exceeds the damping resistance provided by the support structure, the insert 4 is displaced downward in a controlled manner, thereby dynamically stretching the melt and forming the final recessed cavity depth; in the non-injection stage, the top surface of the insert 4 is slightly lower than the top surface of the ribs.
[0031] In existing technologies, the depth of the recessed area is relatively shallow, but the horizontal extension dimension is large. After the melt enters this area, due to the extremely low flow resistance, it quickly fills the bottom of the entire recessed area. However, at this time, the vertical sidewalls and rib roots of the recessed area are not completely filled. Because the melt front in contact with the cold surface of the cavity cools down rapidly and the viscosity increases, the subsequent melt cannot continue to climb upwards to fill the sidewalls and rib grooves under the limited holding pressure. Therefore, the vertical sidewalls or rib walls of the recessed area may have insufficient filling problems. In the design of this invention, the statically preset recessed area is transformed into a dynamic recessed area. In the initial state, the top surface of the insert 4 is slightly lower than the top surface of the rib. During the injection process, the melt first fills the bottom of the mold cavity 3, that is... The flow occurs on the surfaces of multiple recessed areas, resulting in pre-existing flowing melt on the surface of insert 4. As the melt fills, its pressure gradually increases until the holding pressure is reached. At this point, the internal pressure drives insert 4 to move downwards along the inner wall of the assembly groove 6. The displacement of insert 4 is positively correlated with the increase in pressure. Therefore, whenever insert 4 moves downwards, the melt is forced to flow, thus allowing the melt to fill the sidewalls or rib walls of the recessed areas more fully. Secondly, by designing a support structure, the downward movement distance of insert 4 can be controlled, so the downward movement amount of insert 4 is controllable under injection pressure. Furthermore, when insert 4 moves downwards to the preset position, the recessed area is formed, which not only completes the injection molding of the product but also allows the melt to fill the recessed area more fully.
[0032] A preferred embodiment further includes a gas-assisted assembly, which comprises:
[0033] An air chamber is located inside the insert 4; one or more air outlet channels connect the air chamber to an external clean air source; a porous metal sintered breathable layer 5 covers the top surface of the insert 4 and connects to the air chamber; a dense metal cover plate covers the porous metal sintered breathable layer 5 and forms part of the top surface of the insert 4. The metal cover plate has multiple micro-holes with a diameter much smaller than that of the porous metal sintered breathable layer 5. Before the mold opening action is performed, the external clean air source escapes evenly to the top surface of the insert 4 through the air outlet channels, air chamber, porous metal sintered breathable layer 5 and metal cover plate in sequence, forming an air film between the shoe sole and the top surface of the insert 4 to break the vacuum adsorption state.
[0034] Please refer to the following: Figure 2 , Figure 4 , Figure 5 and Figure 7In this embodiment, the external clean gas source, the gas chamber, the porous metal sintered permeable layer 5, and the metal cover plate constitute a unidirectional gas outlet path. The external gas is finally output outward through the micro-holes on the metal cover plate, and is uniform and dense. Since the pore size of the micro-holes is much smaller than that of the porous metal sintered permeable layer 5, after the gas escapes from the porous metal sintered permeable layer 5, it is sprayed out through the micro-holes on the metal cover plate. Under the injection pressure, the molten material cannot pass through such tiny holes due to surface tension, i.e., the capillary barrier formed by the micro-holes, so that the permeable layer is always in a safe state without molten material contact. Specifically, the metal cover plate can be made using laser drilling technology. The metal cover plate is preferably made of stainless steel foil, and it can be welded to the surface of the insert 4 or welded to the insert 4, depending on the process difficulty and actual situation.
[0035] Based on the embodiment of the gas-assisted component, the support structure further includes a side support plate 7 fixedly installed on the inner wall of the assembly groove 6. An assembly cover 8 is slidably installed on the outer wall of the side support plate 7 along the displacement path of the insert 4. An assembly plate 11 is slidably installed inside the assembly cover 8. The sliding direction of the assembly plate 11 is perpendicular to the sliding path of the insert 4. Two feedback links 9 are hinged between the assembly plate 11 and the outer wall of the side support plate 7. An adjustable damping element is installed between the outer wall of the assembly plate 11 and the inner wall of the assembly cover 8. In the non-injection stage, the feedback links 9 are in an inclined state. The feedback links 9 have a breakthrough state, that is, the feedback links 9 can go from the inclined state to the horizontal state. At this time, the downward pressure on the assembly cover 8 reaches the maximum, and the top of the assembly cover 8 contacts the bottom of the insert 4.
[0036] Please refer to the following: Figure 5 and Figure 7In this embodiment, the support structure mainly serves as a damping support to limit the downward movement of the insert 4. During the injection molding process, the increased pressure inside the mold cavity 3 drives the insert 4 to move downward. The downward movement of the insert 4 will pull the assembly cover 8, which it contacts, downward. As the pressure increases, the assembly cover 8 and the assembly plate 11 will move downward synchronously. Due to the hinged relationship of the feedback linkage 9, the assembly plate 11 will slide inside the assembly cover 8, thereby creating pressure on the adjustable damping component and applying damping to the insert 4, limiting the downward movement of the insert 4. After the recessed area is formed, pressure holding molding begins. After injection molding, when gas-assisted demolding is required, the pressure inside the mold cavity will increase. The increased pressure will exert greater downward force on insert 4 and assembly cover 8, causing assembly cover 8 to continue to move downward. This will cause feedback link 9 to move from an inclined state to a horizontal state, until it crosses the horizontal state. When feedback link 9 crosses the horizontal state, it means that the pressure on assembly cover 8 has reached its maximum. At this point, assembly cover 8 loses its restraint on insert 4, allowing insert 4 to move away from the product under the high pressure in the mold cavity. This completes the reaction force demolding, improving the demolding effect. Moreover, gas reaction force demolding can better protect the product because the process from gas breaking the vacuum layer to reaction force demolding is gradual, and the pressure on the product increases in a curve rather than through violent demolding.
[0037] The cooperation between the active insert 4 and the support structure enables dynamic stretching molding of the concave cavity during injection, fundamentally solving the problem of insufficient sidewall filling caused by the melt preferentially spreading to the bottom in large-area shallow cavity areas.
[0038] Furthermore, the adjustable damping component includes a positioning plate 12 slidably mounted on the inner wall of the assembly cover 8. Multiple sets of damping springs are fixedly installed between the positioning plate 12 and the assembly plate 11. A screw thread passes through the outer wall of the assembly cover 8, and the screw is threadedly connected to the through-hole. The end of the screw that enters the assembly cover 8 is rotatably connected to the outer wall of the positioning plate 12. A pressure lug 16 is installed on the top of the side support plate 7, and the pressure lug 16 abuts against the top outer wall of the assembly cover 8 to limit the initial position of the assembly cover 8. An isolation post 13 is fixedly installed at the bottom of the insert 4, and the bottom end of the isolation post 13 is located above the top outer wall of the assembly cover 8. Please refer to [link to relevant documentation]. Figure 6 and Figure 7 In the embodiment, when the feedback link 9 is in an inclined state, the pressure ear 16 will block the assembly cover 8 and limit its displacement. When the injection pressure changes, the deformation of the damping spring can be adjusted by changing the position of the positioning plate 12, thereby changing the initial pressure value of the assembly cover 8, so as to cope with the injection pressure of different materials without changing the downward movement of the insert 4.
[0039] In a preferred embodiment, a hydraulic cylinder assembly is fixedly installed at the inner bottom of the assembly groove 6. In the injection state, the output end of the hydraulic cylinder assembly is not in contact with the outer wall of the bottom of the assembly cover 8. When the feedback linkage 9 is in the breakout state, the output end of the hydraulic cylinder abuts against the outer wall of the assembly cover 8. Please refer to [link to previous embodiment]. Figure 5 and Figure 8 The hydraulic cylinder provides support for the overpass reset of the assembly cover 8.
[0040] Furthermore, an angle sensor is fixedly installed on the inner wall of the assembly cover 8. The hinge shaft at the hinge end of the feedback link 9 near the side support plate 7 extends outward, and the angle sensor is connected to the hinge shaft via a coupling. The angle sensor is associated with the electrical system, so that the rotation angle of the feedback link 9 can be monitored in real time, and its horizontal state can also be monitored, thereby facilitating the control of the assembly cover 8 to reset it.
[0041] Based on the gas-assisted component embodiment, in a preferred embodiment, the porous metal sintered permeable layer 5 is made by powder metallurgy sintering. The powder sintering process is mature and has a high yield. It can be pressed into a sheet and integrally formed on the substrate of the insert 4. The average pore size of the porous metal sintered permeable layer 5 is between five and fifty micrometers, the porosity is between 15% and 40%, and its overall thickness is between one and two millimeters. At this thickness, the porous metal sintered permeable layer 5 has both good gas distribution capability and sufficient structural redundancy. Furthermore, the pore size and porosity of the permeable layer directly determine the uniformity and response speed of gas distribution on the top surface. Uniform and instantaneous surface gas escape is a prerequisite for forming a complete and stable gas film, thereby achieving the destruction of vacuum adsorption.
[0042] In summary, further, the insert 4 is coated with a fluoropolymer coating on the surface in contact with the melt, and a titanium aluminate hard coating on the surface in sliding contact. In this embodiment, to increase the wear resistance of the outer wall of the insert 4 in sliding contact, a titanium aluminate hard coating is applied to its surface. The coating is deposited by a cathodic arc evaporation process. Its main characteristics are: the coating has a high Vickers hardness, several times that of the mold steel substrate, and its heat resistance temperature is extremely high, controlled above 700 degrees Celsius, completely covering the working temperature range of elastomer injection molding, i.e., 80 to 150 degrees Celsius. The fluoropolymer coating is deposited with a metal adhesive layer by physical vapor deposition, and a fluoropolymer functional layer is deposited on the adhesive layer by plasma-enhanced chemical vapor deposition, so that its water contact angle is controlled above 100 degrees Celsius. It has extremely low wettability to liquid release agents, which can reduce the adhesion and carbon buildup of release agents. Moreover, it has low peel strength for molten TPU and EVA, only one-quarter of that of uncoated mold steel, thereby improving its demolding ability and reducing damage.
[0043] Furthermore, a track seat 14 is fixedly installed on the outer wall of the assembly cover 8, and a guide rail groove 15 is provided on the outer wall of the side support plate 7. A sliding assembly relationship is formed between the track seat 14 and the guide rail groove 15. Please refer to [link / reference]. Figure 8 This embodiment provides a specific implementation plan, in which both the track seat 14 and the guide groove 15 are convex structures, which provide limiting and guiding for the sliding of the assembly cover 8.
[0044] Through the combination of the above structures, dynamic stretching and molding of the concave cavity during the injection process is realized, fundamentally solving the problem of insufficient sidewall filling caused by the melt preferentially spreading to the bottom in large-area shallow cavity areas.
[0045] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the specification and drawings can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.
[0046] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An injection molding die for shoe soles based on elastomeric materials, characterized in that: include: Injection modules and electrical systems; An outer mold frame (1) is mounted on an electrical system, and a fixed mold (2) is detachably mounted inside the outer mold frame (1). The fixed mold (2) has a mold cavity (3) for injection molding, the mold cavity (3) including a plurality of ribs and a recessed area formed therearound; An assembly groove (6) is provided at the bottom of the cavity (3) located in the lower region. An insert (4) is slidably installed on the inner wall of the assembly groove (6). A support structure is installed in the assembly groove (6). The support structure is located below the insert (4) and is used to support the insert (4) and provide controllable damping resistance. During the injection stage, the melt pressure acts on the top surface of the insert (4). When the downward thrust generated by the pressure exceeds the damping resistance provided by the support structure, the insert (4) is displaced downward in a controlled manner, thereby dynamically stretching the melt and forming the final concave cavity depth. In the non-injection stage, the top surface of the insert (4) is slightly lower than the top surface of the rib.
2. The shoe sole injection molding die based on elastomeric material according to claim 1, characterized in that: It also includes a gas-assisted assembly, which comprises: An air cavity is disposed inside the insert (4); One or more air outlet channels connect the air chamber to an external clean air source; A porous metal sintered breathable layer (5) covers the top surface of the insert (4) and communicates with the air cavity; A dense metal cover plate covers the porous metal sintered breathable layer (5) and forms part of the top surface of the insert (4). The metal cover plate has multiple micro-holes, the diameter of which is much smaller than the diameter of the porous metal sintered breathable layer (5). Before the mold opening action is performed, the external clean air source passes through the air outlet channel, air cavity, porous metal sintered breathable layer (5) and metal cover plate to uniformly escape to the top surface of the insert (4), forming an air film between the shoe sole product and the top surface of the insert (4) to break the vacuum adsorption state.
3. The shoe sole injection molding die based on elastomeric material according to claim 2, characterized in that: The support structure includes a side support plate (7) fixedly installed on the inner wall of the assembly groove (6). An assembly cover (8) is slidably installed on the outer wall of the side support plate (7) along the displacement path extension line of the insert (4). An assembly plate (11) is slidably installed inside the assembly cover (8). The sliding direction of the assembly plate (11) is perpendicular to the sliding path of the insert (4). Two feedback links (9) are hinged between the assembly plate (11) and the outer wall of the side support plate (7). An adjustable damping element is installed between the outer wall of the assembly plate (11) and the inner wall of the assembly cover (8). In the non-injection stage, the feedback link (9) is in an inclined state. The feedback link (9) has a breakthrough state, that is, the feedback link (9) can go from the inclined state to the horizontal state. At this time, the downward pressure on the assembly cover (8) reaches the maximum. The top of the assembly cover (8) contacts the bottom of the insert (4).
4. The shoe sole injection molding die based on elastomeric material according to claim 3, characterized in that: The adjustable damping component includes a positioning plate (12) slidably mounted on the inner wall of the assembly cover (8). Multiple sets of damping springs are fixedly installed between the positioning plate (12) and the assembly plate (11). A screw is passed through the outer wall of the assembly cover (8). The screw is threadedly connected to the through-hole. The end of the screw that passes through the assembly cover (8) is rotatably connected to the outer wall of the positioning plate (12). A pressure ear (16) is installed on the top of the side support plate (7). The pressure ear (16) abuts against the top outer wall of the assembly cover (8) to limit the initial position of the assembly cover (8). An isolation column (13) is fixedly installed at the bottom of the insert (4). The bottom end of the isolation column (13) is located above the top outer wall of the assembly cover (8).
5. The shoe sole injection molding die based on elastomeric material according to claim 3, characterized in that: A hydraulic cylinder assembly is fixedly installed at the bottom of the assembly groove (6). In the injection state, the output end of the hydraulic cylinder assembly does not contact the bottom outer wall of the assembly cover (8). When the feedback link (9) is in the breakthrough state, the output end of the hydraulic cylinder abuts against the outer wall of the assembly cover (8).
6. The shoe sole injection molding die based on elastomeric material according to claim 5, characterized in that: An angle sensor is fixedly installed on the inner wall of the assembly cover (8). The hinge shaft at the hinge end of the feedback link (9) near the side support plate (7) extends outward, and the angle sensor is connected to the hinge shaft via a coupling.
7. The shoe sole injection molding die based on elastomeric material according to claim 2, characterized in that: The porous metal sintered permeable layer (5) is made by powder metallurgy sintering and is integrally formed on the substrate of the insert (4). The average pore size of the porous metal sintered permeable layer (5) is between five and fifty micrometers, the porosity is between 15% and 40%, and its overall thickness is between one and two millimeters.
8. The shoe sole injection molding die based on elastomeric material according to claim 3, characterized in that: A track seat (14) is fixedly installed on the outer wall of the assembly cover (8), and a guide rail groove (15) is opened on the outer wall of the side support plate (7). A sliding assembly relationship is formed between the track seat (14) and the guide rail groove (15).
9. The shoe sole injection molding die based on elastomeric material according to any one of claims 1-8, characterized in that: The insert (4) is designed with a fluoropolymer coating on the surface that comes into contact with the melt, and the insert (4) is designed with a nitrogen-aluminum-titanium hard coating on the surface that comes into contact with the sliding contact.