A valve core valve assembly mold for aerospace

Abstract

The utility model provides a valve core valve door subassembly mould for aerospace, this mould includes upper mould, middle mould and lower mould which are sequentially arranged from top to bottom, upper mould, middle mould and lower mould surround the matched forming cavity with the appearance of valve core valve door subassembly under the mould closing state, the lower surface central part of upper mould is provided with upper lining layer groove, and the upper temperature resistance lining layer is embedded in the upper lining layer groove, the central part of middle mould is provided with central lining layer step hole, and the central temperature resistance lining layer is embedded in the central lining layer step hole, the central part of lower mould is provided with lower lining layer skeleton hole, and the lower temperature resistance lining layer is arranged along the inner wall annularly of lower lining layer skeleton hole, upper mould and middle mould are provided with the guiding column and guiding hole of mutual cooperation respectively between middle mould and lower mould, the guiding column and guiding hole are arranged along the mould closing direction, and the coaxial cooperation relation of three is kept, the utility model mould forming size is stable, the product glue layer thickness is even, is suitable for the batch production of small sealed valve spare of aerospace.

Description

Technical Field

[0001] This utility model belongs to the field of sealing component mold technology, specifically relating to a valve core valve component mold for aerospace applications. Background Technology

[0002] Valves, including those for propulsion, environmental control, and attitude control, are commonly found in the piping systems of aerospace vehicles. These assemblies, typically composed of a metal frame and materials with elastic or sealing functions, must simultaneously meet requirements for high-pressure sealing, resistance to high and low temperatures, resistance to media corrosion, and reliability under repeated opening and closing within a relatively small structural size. To ensure a strong encapsulation and positioning relationship between the metal components and elastic materials such as rubber, specialized molds are often used in engineering to complete one or more molding processes. The dimensional accuracy and surface fit of the mold cavity ensure the relative positions of the valve core, valve plate, fixing strip, and sealing edge, thus providing a reference for subsequent assembly. As aerospace valves evolve towards lightweight, miniaturized designs and complex sealing surfaces, molds must not only accurately constrain the position of metal inserts but also mold detailed structures such as varying thicknesses, smooth transitions, and local sealing flanges within a limited space. Consequently, the precision requirements for mold design and molding processes have increased.

[0003] Existing rubber overmolding or rubber-metal integrated molding technologies are mostly developed for sealing components in conventional pipelines or industrial equipment. Their operating pressure, media cleanliness, and temperature fluctuation range differ from those in aerospace environments, limiting the versatility of molds in positioning, venting, temperature control, and demolding. Especially in cases where multiple structural segments such as door panels, fixing strips, and connecting parts are molded simultaneously, if the mold cannot provide reliable three-dimensional positioning and clamping for each metal segment, misalignment can easily occur during vulcanization or pressurization, leading to discontinuous sealing surfaces, uneven thickness, or abnormal stiffness of the connecting parts after molding. Adding subsequent assembly processes such as bonding or mechanical hinges to address misalignment introduces more steps and unstable interface strength, hindering the development of standardized mold solutions suitable for mass production.

[0004] Furthermore, aerospace valve core components often operate in environments with high cleanliness requirements or high-pressure gases. The surfaces of the parts cannot have obvious flash, porosity, inclusions, or other molding defects. The parting line design, gating, and venting structure of the mold must consider both the appearance and function of the sealing component. Common simple parting or unidirectional mold closing methods cannot simultaneously meet the requirements of a smooth outer surface, precise internal cavity molding, and non-displacement of inserts. Existing technologies also employ a single hot-press vulcanization process to integrally mold metal parts and rubber layers. However, when used in small-sized aerospace valves with multiple component assemblies, problems remain, including overly large mold structures, cumbersome clamping procedures, obstructed rubber flow paths, difficulty in molding localized flexible areas, and challenges in ensuring consistency during repeated production. Therefore, more targeted research and improvement of mold structures and molding methods are needed, specifically tailored to the structural characteristics and operating conditions of aerospace valve core components. Summary of the Invention

[0005] This utility model provides a mold for valve core valve assembly for aerospace and its forming method, which solves the problems of unreliable positioning of multi-metal inserts, insufficient forming accuracy and consistency, and difficulty in meeting the integrated forming requirements of aerospace valve core valve assembly in the prior art.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: Firstly, this utility model provides a mold for a valve core assembly for aerospace applications, comprising an upper mold, a middle mold, and a lower mold arranged sequentially from top to bottom; the upper mold, middle mold, and lower mold, when in the closed state, form a molding cavity that matches the shape of the valve core assembly; The upper mold has an upper lining groove in the center of its lower surface, and an upper heat-resistant lining is embedded in the upper lining groove. The central part of the intermediate mold is provided with a central lining step hole, and a central heat-resistant lining is embedded in the central lining step hole. The lower mold has a lower lining skeleton hole in the center, and a lower heat-resistant lining is arranged circumferentially along the inner wall of the lower lining skeleton hole. The upper mold and the middle mold, and the middle mold and the lower mold are respectively provided with mutually cooperating guide pillars and guide holes. The guide pillars and guide holes are arranged along the mold closing direction to maintain the coaxial cooperation relationship of the three.

[0007] Furthermore, the valve core assembly includes a skeleton body and a rubber part disposed on the skeleton body; the skeleton body is integrally formed from an upper disc segment and a cylindrical segment extending downward in the same direction as the disc segment, the upper surface of the disc segment is provided with an annular groove along the circumference, and the rubber part is an annular rubber component embedded in the annular groove.

[0008] Furthermore, the upper heat-resistant liner is a circular plate structure, with a threaded blind hole in the center of the upper end face of the upper heat-resistant liner, and a threaded through hole corresponding to the upper mold. Bolts pass through the threaded through holes to fix the upper heat-resistant liner in the groove of the upper liner.

[0009] Furthermore, the central liner stepped hole is formed from top to bottom into a large diameter section and a small diameter section, and the shape of the central heat-resistant liner matches the shape of the central liner stepped hole; the lower end of the central heat-resistant liner is provided with a threaded blind hole, and the lower surface of the middle mold is provided with a threaded countersunk hole corresponding to the threaded blind hole, and the bolt passes through the threaded countersunk hole to fix the central heat-resistant liner in the central liner stepped hole.

[0010] Furthermore, the lower heat-resistant liner is an annular sleeve structure, and the inner wall of the lower liner skeleton hole is provided with a circumferential limiting shoulder that cooperates with the annular sleeve structure. The lower end face of the lower heat-resistant liner is provided on the circumferential limiting shoulder, and the upper end face of the lower heat-resistant liner is flush with the upper end face of the lower mold.

[0011] Furthermore, the lower surface of the upper mold is provided with an annular recessed cavity, which corresponds to the position of the rubber part of the valve core assembly.

[0012] Furthermore, an annular glue flow groove is provided on the lower surface of the upper mold, and the annular glue flow groove is adjacent to the recessed mold cavity.

[0013] Furthermore, the upper heat-resistant liner, the central heat-resistant liner, and the lower heat-resistant liner are made of modified polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE).

[0014] Furthermore, the mold for the aerospace valve core assembly has a multi-cavity structure.

[0015] Furthermore, the upper heat-resistant liner and the central heat-resistant liner are both connected to the upper mold and the middle mold via a snap-fit ​​structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The aerospace valve core assembly mold of this utility model adopts a three-section arrangement of upper mold, middle mold and lower mold, and respectively set upper lining groove, central lining step hole and lower lining skeleton hole at the central position of the three. Upper heat-resistant lining, central heat-resistant lining and lower heat-resistant lining are embedded in the corresponding positions to form a continuous heat-resistant isolation zone from top to bottom. This ensures that there is no direct hard contact between the disc section and cylindrical section of the skeleton body and the metal surface of the mold during molding. It can protect the metal surface of the skeleton body and the adhesive layer under high temperature vulcanization conditions, reduce failure caused by local overheating, metal scratches or indentations, and improve the local sealing and pressure holding stability of the mold cavity. It is suitable for the integrated molding of small, high-precision valve core assembly in aerospace scenarios.

[0017] In this embodiment of the invention, the upper and central heat-resistant lining layers are fixed to the upper and middle molds respectively by bolts, with clear structural positions and a clear assembly sequence, enabling the same cavity contour to be obtained repeatedly each time the mold is closed. The lower heat-resistant lining layer adopts an annular sleeve and fits against the circumferential limiting shoulder of the lower lining layer skeleton hole, which can play a coaxial guiding and circumferential limiting role for the cylindrical section of the skeleton body. With the coaxial arrangement of the upper and lower guide pillars and guide holes, the mold is less prone to eccentricity and misalignment during the mold closing process, fundamentally solving the problems of easy displacement of metal inserts and uneven thickness of rubber coating layer in the prior art, thereby ensuring the consistency of the forming size and sealing position of the valve core valve assembly.

[0018] This embodiment of the invention forms a recessed mold cavity on the lower surface of the upper mold corresponding to the rubber part of the valve core assembly, and provides an annular glue flow groove in its circumference. This allows the applied rubber strip or sheet to spread evenly in the circumference during the pressurization and heating stages, entering the recessed part and the annular groove of the skeleton body. This avoids the problems of insufficient local glue filling, uneven rubber density, or concentrated flash caused by the traditional single-point glue injection method. After molding, the rubber part has a complete appearance and neat edges, which is beneficial for subsequent edge trimming and inspection. Using modified polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE) materials to make three heat-resistant lining layers can simultaneously meet the requirements of heat resistance, dimensional stability, and demolding within the vulcanization temperature range, improving the service life and turnover rate of the mold.

[0019] Of course, implementing the various technical solutions of this utility model does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the valve core valve assembly of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the structure of the valve core valve assembly mold for aerospace applications, as shown in Embodiment 1 of this utility model. Figure 3 yes Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of the structure of the heat-resistant lining in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the structure of the central heat-resistant lining in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the structure of the heat-resistant lining in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the mold-closing structure of Embodiment 1 of this utility model; Figure 8 This is a schematic diagram of the structure of the mold in Embodiment 2 of this utility model; In the figure, 1-upper mold, 2-middle mold, 3-lower mold, 4-upper heat-resistant liner, 5-central heat-resistant liner, 6-lower heat-resistant liner, 7-guide post, 8-guide hole, 9-bolt, 10-recessed mold cavity, 11-glue flow channel, 12-skeleton body, 13-rubber part. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Of course, such terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0026] Example 1: like Figure 1As shown, the valve core assembly prepared in this embodiment includes a skeleton body 12 and a rubber part 13 disposed on the skeleton body 12. The skeleton body 12 is integrally formed from an upper disc segment and a cylindrical segment extending downward in the same direction as the disc segment. An annular groove is provided on the upper surface of the disc segment in the circumferential direction. The rubber part 13 is an annular rubber part that matches the size of the annular groove and is embedded in the annular groove after molding.

[0027] like Figures 2 to 7 As shown, a mold for aerospace valve core assembly includes an upper mold 1, a middle mold 2, and a lower mold 3 arranged sequentially from top to bottom. When closed, the upper mold 1, middle mold 2, and lower mold 3 form a molding cavity that matches the shape of the valve core assembly. The central axis of the molding cavity is aligned with the closing direction of the three molds to ensure the coaxiality and dimensional accuracy of the valve core assembly during the vulcanization molding process.

[0028] The lower surface of the upper mold 1 has a centrally machined upper liner groove, which is circular in shape and is used to accommodate the upper heat-resistant liner 4. The upper heat-resistant liner 4 is a circular plate structure with a threaded blind hole in the center of its upper end face. The upper mold 1 has a threaded through hole at the corresponding position. Bolts 9 pass through the threaded through hole of the upper mold 1 and connect to the threaded blind hole of the upper heat-resistant liner 4, reliably fixing the upper heat-resistant liner 4 in the upper liner groove, thus preventing the upper heat-resistant liner 4 from shifting in position during multiple mold closing and opening processes. The lower surface of the upper heat-resistant liner 4 is a smooth molding surface, which directly faces the upper surface of the middle mold 2 during mold closing, allowing for shaping and heat insulation of the rubber part of the valve core valve assembly under high-temperature vulcanization conditions.

[0029] The intermediate mold 2 has a central lining stepped hole, which forms a large-diameter section and a small-diameter section from top to bottom. The profile at the opening corresponds to the disc section of the valve core assembly. The central heat-resistant lining 5 is embedded in the central lining stepped hole. The outer periphery of the central heat-resistant lining 5 has a stepped surface that matches the large-diameter section, and its lower end has a threaded blind hole. The lower surface of the intermediate mold 2 has a threaded countersunk hole at the position corresponding to the threaded blind hole. The bolt 9 passes through the threaded countersunk hole from bottom to top and connects to the threaded blind hole of the central heat-resistant lining 5, fixing the central heat-resistant lining 5 in the central lining stepped hole. This ensures that the central heat-resistant lining 5 fits in the radial direction and forms a reliable limit in the axial direction. It can provide a stable support surface for the disc section of the skeleton body 12 when the mold is closed, and avoid the skeleton body 12 from directly contacting the metal surface of the intermediate mold under high temperature and pressure, thus preventing indentation.

[0030] The lower mold 3 has a lower lining skeleton hole in its center. The lower lining skeleton hole is a circular through hole that fits the cylindrical section of the skeleton body 12. A lower heat-resistant lining 6 is arranged circumferentially along the inner wall of the lower lining skeleton hole. In this embodiment, the lower heat-resistant lining 6 is an annular sleeve structure. The inner wall of the lower lining skeleton hole is machined with an annular limiting shoulder that matches the annular sleeve structure. The lower end face of the lower heat-resistant lining 6 sits on the annular limiting shoulder, and the upper end face of the lower heat-resistant lining 6 is flush with the upper end face of the lower mold 3. With this arrangement, when the cylindrical section of the skeleton body 12 is inserted into the lower heat-resistant lining 6, it can obtain circumferential heat-resistant support. At the same time, the lower heat-resistant lining 6 is also locked axially by the limiting shoulder of the lower mold 3, preventing it from shifting downwards due to repeated loading and unloading, thereby ensuring that the vertical position of the skeleton body 12 is consistent each time the mold is installed.

[0031] To ensure the assembly accuracy of the three molds, guide pillars 7 and guide holes 8 are respectively provided between the upper mold 1 and the middle mold 2, and between the middle mold 2 and the lower mold 3. The guide pillars 7 are fixed to the side or upper and lower end faces of the middle mold 2, and the guide holes 8 are respectively opened on the upper mold 1 and the lower mold 3, corresponding one-to-one with the guide pillars 7. The guide pillars 7 and guide holes 8 are arranged along the mold closing direction and are fitted with clearance fit or bushings, which can automatically correct the relative positions of the upper mold 1, middle mold 2 and lower mold 3 during the mold closing process, so that the forming cavity always remains coaxial. Figure 6 In the structure shown, the upper and lower guides work together to effectively limit the lateral displacement and tilting of the mold, and improve the repeatability of the mold's positioning accuracy. This is a relatively important structure in small-sized sealing molds for aerospace applications.

[0032] like Figure 2 , Figure 3 As shown, an annular flow groove 11 is provided on the lower surface of the upper mold 1 around the outer periphery of the recessed mold cavity 10. The annular flow groove 11 serves to vent air and temporarily store excess rubber material. During vulcanization, the rubber material placed in the annular groove of the skeleton body 12 is compressed and flows circumferentially to replenish the recessed mold cavity 10, making the cross-sectional distribution of the rubber part 13 more uniform, reducing gas trapping and localized rubber shortages, and facilitating subsequent trimming of the rubber edge. Since the annular groove itself has a certain width, the rubber material is not easy to sink on both sides, but the middle position is prone to shrinkage and depression. Therefore, a recessed mold cavity 10 is provided at the corresponding position of the upper mold 1 to offset the central depression caused by the shrinkage of the rubber material. The depth of the depression is determined according to the shrinkage of the molded rubber material.

[0033] In terms of materials, in this embodiment, the upper heat-resistant liner 4, the central heat-resistant liner 5, and the lower heat-resistant liner 6 are all made of modified polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE). These materials have good high-temperature resistance, dimensional stability, and demolding properties. They are not easily deformed within the hot vulcanization temperature range of 100-180℃ and will not stick to rubber, thus extending the service life of the liner and reducing the frequency of mold maintenance. The upper mold 1, the middle mold 2, and the lower mold 3 can be integrally machined from mold steel to ensure the rigidity and wear resistance of the cavity.

[0034] This embodiment features a single-cavity structure, suitable for molding aerospace valve core components that are small in size and require precise batch production. Based on the same structural arrangement, the upper liner groove, central liner stepped hole, and lower liner skeleton hole can be equidistantly replicated on the planes of the upper mold 1, middle mold 2, and lower mold 3 to form a multi-cavity structure for molding multiple products in a single operation. This structure can be found in [reference needed]. Figure 7 The planar arrangement is shown. In this way, the present invention can meet the needs of single-piece samples or small-batch trial production, and can also be extended to mass production through multiple cavities, exhibiting good structural versatility and production adaptability.

[0035] With the above structure, the mold in this embodiment can clamp and limit the skeleton body 12 in both the upper and lower directions after the mold is closed. The three heat-resistant lining layers respectively undertake the three functions of heat insulation molding of the upper surface, support of the disc section, and circumferential guidance of the cylindrical section, so that the skeleton body 12 maintains a stable position throughout the vulcanization molding process. This ensures the molding accuracy of the rubber part 13 of the valve core valve assembly and its concentricity with the skeleton, and solves the problems of uneven rubber coating thickness, easy skeleton displacement, and poor consistency in repeated production of small-sized aerospace valves in the prior art.

[0036] The following describes the working steps of the aerospace valve core assembly mold in this embodiment, including the following steps: S1. Surface Pretreatment of the Skeleton: The metal skeleton body 12 to be formed is degreased and cleaned to remove oil, oxide scale, and surface impurities. Subsequently, the annular groove area and the upper surface of the disc section on the skeleton body 12 that need to be bonded to rubber are sandblasted with 10-80 mesh abrasive or subjected to phosphating to form a roughened layer, giving these areas a micro-uneven structure suitable for rubber penetration. This step improves the interfacial bonding strength between the rubber part 13 and the metal skeleton body 12, reducing peeling of the finished product under high and low temperature cycling.

[0037] S2. Adhesive Coating and Pre-curing: On the bonding area of ​​the skeleton body 12 after sandblasting or phosphating, apply the first coat of adhesive evenly with a brush. The adhesive can be any of Lechner, Kemlock, or Kaiker Hill. Let it stand for about 1 hour to allow it to dry to the touch. Then apply the second coat of adhesive. After it is completely dry to the touch, place the skeleton body 12 in a sealed bag or clean container for later use. Double coating ensures that the adhesive forms a continuous coating on the metal surface, providing sufficient conditions for the chemical bonding between the rubber molecules and the metal surface during subsequent hot vulcanization, thereby improving the resistance of the molded part to media and peeling.

[0038] S3. Rubber compound preparation: The formulated rubber compound is pressed into a sheet of specified thickness on a two-roll mill. The sheet is then cut into strips according to the annular dimensions of the rubber section 13 of the valve core assembly. If necessary, multiple strips can be cut at once according to the number of multi-cavity molds to reduce the molding cycle time. This step ensures controllable material volume, resulting in more uniform rubber flow in the subsequent rubber flow channel 11 and preventing large-area flash due to excessive material feeding.

[0039] S4. Pre-assembly of mold and three heat-resistant lining layers: Install the upper heat-resistant lining layer 4 into the upper mold 1; install the lower heat-resistant lining layer 6 into the lower lining skeleton hole of the lower mold 3, so that its lower end face abuts against the circumferential limiting shoulder; bolt the central heat-resistant lining layer 5 into the central lining step hole of the middle mold 2; the purpose of this step is to provide additional limiting and heat insulation for the metal skeleton without changing the mold cavity size, which helps to prevent the skeleton from shifting under pressure.

[0040] S5. Loading the skeleton and rubber material: Take out the skeleton body 12 processed in S2, accurately place the rubber strip cut in S3 into the annular groove of the disc section of the skeleton body 12, and then insert the cylindrical section of the skeleton body 12 into the cavity formed by the middle mold 2 and the lower mold 3, so that the cylindrical section is inserted into the lower heat-resistant liner 6, and the upper surface of the disc section rests smoothly on the upper end surface of the central heat-resistant liner 5. At this time, the skeleton body 12 is defined by three heat-resistant liners 4, 5, and 6 in the vertical direction, and is covered by the lower heat-resistant liner 6 in the circumferential direction, ensuring that the skeleton body 12 maintains the designed position during the subsequent mold closing and vulcanization process.

[0041] S6. Upper Mold Closure: The upper mold 1, equipped with the upper heat-resistant liner 4, is closed with the middle mold 2 along the direction of the guide post 7 and guide hole 8, forming a complete upper molding space between the upper heat-resistant liner 4 and the central heat-resistant liner 5. Simultaneously, the recessed mold cavity 10 on the lower surface of the upper mold 1 corresponds one-to-one with the position of the rubber material on the middle mold 2. For multi-cavity structures, four or more cavities are simultaneously closed and positioned. This step ensures the depth, coaxiality, and sealing of the cavities, reducing uneven rubber thickness caused by misalignment during mold closing.

[0042] S7. Hot vulcanization molding: The mold, after being closed, is placed into a flat vulcanizing machine for heating and pressurization. The vulcanization temperature is set within the range of 100-180℃, the pressure is set within the range of 5-20 MPa, and the vulcanization time is controlled within 10-30 min. During the pressurization and heating process, the rubber material diffuses within the annular groove and recessed mold cavity 10. Under the protection and limiting effect of the upper heat-resistant liner 4, the central heat-resistant liner 5, and the lower heat-resistant liner 6, the rubber will not be burned by the high-temperature metal surface or squeezed out of the parting surface, thus obtaining a rubber part 13 with a complete shape and uniform thickness.

[0043] S8. Demolding and finishing: After vulcanization, open the upper mold 1 and the middle mold 2 in sequence, take out the molded valve core valve assembly from the middle mold 2, let it cool naturally to room temperature, and remove the excess glue edge generated along the parting surface to obtain a valve core valve assembly with stable dimensions and uniform glue layer.

[0044] Through the above steps, the reliable positioning of the skeleton body 12 during the molding process is ensured, as well as the uniformity of rubber filling and the integrity of molding of the rubber part 13. At the same time, each step corresponds to the conventional process parameters of the existing flat vulcanizing machine, which can be directly implemented on the existing production line, with the advantages of high process feasibility and good product consistency.

[0045] Example 2: like Figure 8 As shown, this embodiment provides a mold for aerospace valve core components, which is an improvement on Embodiment 1. The difference is that the mold for aerospace valve core components in this embodiment has a multi-cavity structure, and the upper and central heat-resistant linings are connected to the upper and middle molds by a snap-fit ​​structure, which facilitates the assembly, replacement, and maintenance of the linings and is suitable for mass production. At the same time, the snap-fit ​​structure is designed to be elastic, which can compensate for the thermal expansion generated during the hot vulcanization process, ensuring that the three heat-resistant linings remain in contact with the mold surface throughout the entire molding cycle.

[0046] In this embodiment, the upper, middle, and lower molds are all arranged in a multi-station structure. Four molding cavities, matching the shape of the valve core assembly, are equidistantly spaced along the longitudinal and transverse directions on the same mold-closing plane. Each cavity is equipped with an upper lining groove, a central lining step hole, and a lower lining skeleton hole, thus forming a "four-cavity integrated" multi-cavity mold structure. The cavities maintain the same center distance and surface dimensions, facilitating the simultaneous molding of four valve core assemblies in a single mold-closing operation. This increases the number of units produced per unit time without increasing the number of vulcanization cycles, thereby reducing production costs.

[0047] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A mold for a valve core assembly for aerospace applications, characterized in that, It includes an upper mold, a middle mold, and a lower mold arranged sequentially from top to bottom; the upper mold, the middle mold, and the lower mold, when in the closed state, form a molding cavity that matches the shape of the valve core valve assembly; The upper mold has an upper lining groove in the center of its lower surface, and an upper heat-resistant lining is embedded in the upper lining groove. The central part of the intermediate mold is provided with a central lining step hole, and a central heat-resistant lining is embedded in the central lining step hole. The lower mold has a lower lining skeleton hole in the center, and a lower heat-resistant lining is arranged circumferentially along the inner wall of the lower lining skeleton hole. The upper mold and the middle mold, and the middle mold and the lower mold are respectively provided with mutually cooperating guide pillars and guide holes. The guide pillars and guide holes are arranged along the mold closing direction to maintain the coaxial cooperation relationship of the three.

2. The aerospace valve core assembly mold according to claim 1, characterized in that, The valve core assembly includes a skeleton body and a rubber part disposed on the skeleton body; the skeleton body is integrally formed from an upper disc segment and a cylindrical segment extending downward in the same direction as the disc segment, the upper surface of the disc segment is provided with an annular groove along the circumference, and the rubber part is an annular rubber component embedded in the annular groove.

3. The aerospace valve core assembly mold according to claim 1, characterized in that, The upper heat-resistant liner is a circular plate structure. A threaded blind hole is provided in the center of the upper end face of the upper heat-resistant liner, and a threaded through hole is provided in the upper mold accordingly. Bolts pass through the threaded through holes to fix the upper heat-resistant liner in the groove of the upper liner.

4. The aerospace valve core assembly mold according to claim 1, characterized in that, The central liner stepped hole forms a large diameter section and a small diameter section from top to bottom. The shape of the central heat-resistant liner matches the central liner stepped hole. A threaded blind hole is provided at the lower end of the central heat-resistant liner. A threaded countersunk hole is provided on the lower surface of the intermediate mold corresponding to the threaded blind hole. The bolt passes through the threaded countersunk hole to fix the central heat-resistant liner in the central liner stepped hole.

5. The aerospace valve core assembly mold according to claim 1, characterized in that, The lower heat-resistant liner is an annular sleeve structure. The inner wall of the lower liner skeleton hole is provided with a circumferential limiting shoulder that cooperates with the annular sleeve structure. The lower end face of the lower heat-resistant liner is provided on the circumferential limiting shoulder, and the upper end face of the lower heat-resistant liner is flush with the upper end face of the lower mold.

6. The aerospace valve core assembly mold according to claim 2, characterized in that, The lower surface of the upper mold is provided with an annular recessed cavity, which corresponds to the position of the rubber part of the valve core assembly.

7. The aerospace valve core assembly mold according to claim 6, characterized in that, An annular glue flow groove is provided on the lower surface of the upper mold, and the annular glue flow groove is adjacent to the recessed mold cavity.

8. The aerospace valve core assembly mold according to claim 1, characterized in that, The upper heat-resistant liner, the middle heat-resistant liner, and the lower heat-resistant liner are made of modified polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE).

9. The aerospace valve core assembly mold according to claim 1, characterized in that, The mold for the aerospace valve core assembly has a multi-cavity structure.

10. The aerospace valve core assembly mold according to claim 1, characterized in that, The upper and central heat-resistant lining layers are connected to the upper and middle molds via a snap-fit ​​structure.

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