Astronavigation-level vulcanized rubber sealing surface processing method

Abstract

The invention discloses a processing method of an aerospace-grade vulcanized rubber sealing surface. The processing method comprises the following steps: vulcanizing rubber; processing a metal matrix; cleaning for the first time; turning a rubber surface, wherein cutting fluid is not used in the whole turning process; and cleaning for the second time: polishing the rubber surface until the roughness of the rubber surface reaches Ra0.4 or above, and finishing the processing. According to the invention, nanoscale zinc oxide for vulcanization is adopted and glue pressing is carried out immediately, so that white spots are avoided; during metal processing, allowance is controlled, cutting fluid is forbidden, and metal filing pollution is prevented; metal impurities are removed through primary cleaning, and bright spots are eliminated; the flatness is guaranteed through a tool for rubber turning; rubber chippings are removed through secondary cleaning, and pits are avoided; and through graded polishing, the roughness Ra is guaranteed to be more than 0.4, deflection is avoided, and batch high-quality production is achieved. The operation is simple and convenient, the cost is controllable, and the processing and manufacturing level of aerospace-level rubber sealing elements can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of rubber processing technology, and in particular to a method for processing the sealing surface of vulcanized rubber. Background Technology

[0002] Rubber materials, due to their excellent elasticity, sealing properties, and corrosion resistance, are widely used in valve sealing, especially in low-pressure valves, where rubber sealing surfaces are commonly used. Currently, there are three main application methods for rubber sealing surfaces in conventional low-pressure valves: first, direct use after vulcanization; second, use after grinding following vulcanization; and third, use after attaching an F4 film to the surface of the vulcanized rubber sealing surface. For these conventional applications, the surface roughness of the rubber sealing surface is generally required to be Ra1.6, and surface quality inspection is usually done visually or with the aid of a 10x microscope. This standard meets the sealing requirements of conventional low-pressure valves.

[0003] However, the application environment for rubber sealing surfaces in aerospace-grade equipment such as satellite propulsion systems is far more demanding. As a core component of a satellite, the satellite propulsion system requires precise control of fluid transmission, pressure regulation, and flow distribution, which places extremely high performance demands on the vulcanized rubber sealing surfaces within the system. For example, the surface roughness requirement alone is typically Ra0.8, while the actual acceptance standard is raised to Ra0.4, a standard far exceeding the requirements for conventional vulcanized rubber sealing surfaces.

[0004] Currently, both domestically and internationally, there are numerous technical challenges in processing vulcanized rubber sealing surfaces with a roughness of Ra0.4 or higher. The resulting sealing surfaces often exhibit various defects, including: Separation of rubber and metal surfaces: During processing, the bonding force between the rubber and the metal matrix is ​​affected, causing them to peel off, which seriously affects the sealing performance and structural stability; Rubber surface misalignment: Uneven force during processing or unreasonable tooling design makes it impossible for the rubber sealing surface to maintain a perpendicular or parallel relationship with the metal substrate, resulting in excessive flatness. Rubber surface pits: Impurities generated during processing or improper processing parameters can cause localized pits on the rubber surface, compromising the integrity of the sealing surface. White spots and bright spots on the rubber surface: White spots are mainly caused by zinc oxide precipitation during the vulcanization process, while bright spots are formed by metal powder embedded in the rubber surface during the machining process. These defects not only affect the appearance quality of the sealing surface, but also reduce the reliability of the seal, and cannot meet the requirements of aerospace-grade equipment.

[0005] Due to the aforementioned defects, existing processing technologies cannot achieve mass production of aerospace-grade vulcanized rubber sealing surfaces, severely restricting my country's aerospace industry, especially the research and development and production of key equipment such as satellite propulsion systems. Therefore, developing a processing method for aerospace-grade vulcanized rubber sealing surfaces that can solve the above technical problems and achieve a surface roughness of Ra0.4 or higher, excellent surface quality, and high dimensional accuracy has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] To address the shortcomings in the aforementioned background technology, this invention proposes a processing method for aerospace-grade vulcanized rubber sealing surfaces. This method solves the problems encountered in the processing of aerospace-grade vulcanized rubber sealing surfaces in the prior art, such as separation of rubber and metal surfaces, rubber surface skew, rubber surface pits, rubber surface bright spots, and rubber surface roughness not reaching Ra0.4. This method enables batch and high-quality processing of aerospace-grade vulcanized rubber sealing surfaces, meeting the usage requirements of aerospace-grade equipment such as satellite propulsion systems.

[0007] The technical solution of this invention is implemented as follows: A method for processing aerospace-grade vulcanized rubber sealing surfaces, comprising the following steps: S1: Rubber vulcanization: Nano-sized zinc oxide particles are selected as vulcanizing agents. Rubber raw materials and other compounding agents are mixed in proportion. After mixing, the rubber is immediately pressed with the metal matrix and left to stand to obtain vulcanized rubber blanks. S2: Machining the metal substrate: The metal substrate on the vulcanized rubber blank is machined using a metal rubber turning tool, with machining allowance reserved according to the final size requirements; no cutting fluid is used during the turning process, and the metal rubber turning tool is rinsed after each workpiece is machined; S3: First cleaning: Fix the workpiece obtained in step S2 with the rubber side facing down in the anhydrous ethanol of the ultrasonic cleaner, and turn on the ultrasonic cleaner; after cleaning, observe the rubber surface under a multi-magnification lens to see if there are any metallic bright spots; if there are metallic bright spots, determine whether the bright spots are embedded in the rubber: if the metallic bright spots are embedded in the rubber, peel them off; if the metallic bright spots are not embedded in the rubber, move them to remove them; after removal, put the workpiece back into the ultrasonic cleaner for a second cleaning. S4: Turning the rubber surface: Using a rubber sealing surface removal tool, the vulcanized rubber blank cleaned in step S3 is turned to remove excess rubber material. The processed rubber surface is higher than the metal substrate. No cutting fluid is used during the turning process. S5: Second cleaning: Fix the workpiece processed in step S4 with the rubber side facing down in the ultrasonic cleaner; add clean anhydrous ethanol to the ultrasonic cleaner and turn on the ultrasonic cleaner for the second cleaning. S6: Polishing the rubber surface: Select at least two types of sandpaper with different grits. Soak and rub the coarse and fine sandpaper in anhydrous ethanol. Use the coarse sandpaper for rough polishing with a feed rate of 0.001~0.008mm, while rinsing the rubber surface with anhydrous ethanol. After rough polishing, replace with fine sandpaper for fine polishing with the same polishing parameters as rough polishing, until the roughness of the rubber surface reaches Ra0.4 or higher, completing the process.

[0008] More preferably, in step S1, the particle size of the nano-sized oxide particles is 50-100 nm.

[0009] More preferably, in step S1, during the mixing process, the vulcanization temperature is 150-160℃, the vulcanization pressure is 5-8MPa, and the vulcanization time is 15-20min.

[0010] More preferably, in step S2, the cutting edge material of the metal rubber lathe tool is cemented carbide, and the machining allowance is 0.01-0.03mm.

[0011] More preferably, in step S2, the turning feed direction is a uniform feed along the axis of the metal substrate.

[0012] More preferably, in step S3, the magnifying glass is at least a 30x magnifying glass.

[0013] More preferably, in step S4, the rubber sealing surface measuring tool includes a tool holder and a tungsten carbide cutting rubber insert, with the tungsten carbide cutting rubber insert vertically connected to the tool holder.

[0014] More preferably, in step S4, the processed rubber surface is 0.08~0.12mm higher than the metal substrate.

[0015] In a further preferred embodiment, in step S6, the plane containing the sandpaper is placed perpendicular to the rubber sealing surface, and the sandpaper is polished at least 5 times according to the feed rate, i.e., observed under magnification and rinsed with anhydrous ethanol.

[0016] More preferably, in step S6, the coarse sandpaper is 3000 grit and the fine sandpaper is 5000 grit.

[0017] The beneficial effects of this invention are as follows: This invention uses nano-grade zinc oxide for vulcanization and immediate pressing to eliminate white spots; it controls allowances in metal processing, prohibits cutting fluid, and prevents metal shavings contamination; the initial cleaning removes metal impurities and eliminates bright spots; rubber turning tools ensure flatness; the secondary cleaning removes rubber debris and avoids pits; graded polishing ensures a roughness of Ra0.4 or higher without skew, achieving high-quality mass production; it is easy to operate and cost-controllable, effectively improving the processing and manufacturing level of aerospace-grade rubber seals, providing strong technical support for the development of the aerospace industry, and has broad industrial application prospects and significant economic and social benefits.

[0018] This invention effectively prevents zinc oxide precipitation during the settling process by using nano-sized zinc oxide as a vulcanizing agent and performing pressing treatment immediately after rubber compounding. This eliminates the white spot defect on the rubber surface at its source, ensuring the surface quality of the sealing surface and solving the problem of white spot defects on the rubber surface. During processing, by rationally designing the machining allowance of the metal substrate and optimizing the turning and polishing process parameters, the stress impact on the rubber-metal substrate bonding surface is reduced, ensuring a strong bond between the rubber and the metal substrate and preventing separation. This invention also avoids the separation of the rubber and metal surfaces.

[0019] This invention effectively avoids the rubber surface from becoming skewed during polishing by ensuring that the sandpaper is perpendicular to the rubber sealing surface. At the same time, through two ultrasonic cleaning processes, impurities such as metal powder and rubber debris generated during processing are thoroughly removed, preventing these impurities from causing pits on the rubber surface in subsequent processing, thus ensuring the flatness of the sealing surface and preventing rubber surface skew and pit defects.

[0020] This invention removes metal powder adhering to the rubber surface during the turning of the metal substrate through a first ultrasonic cleaning process. For metal bright spots embedded or not embedded in the rubber surface, tooling is used to treat them separately, ensuring that no metal impurities remain on the rubber surface and completely eliminating bright spot defects. By adopting a process route of turning + two cleaning cycles + graded polishing, and optimizing polishing parameters, the roughness of the rubber sealing surface can be consistently maintained at Ra0.4 or higher, meeting the requirements for aerospace-grade equipment; thus achieving high roughness requirements.

[0021] The processing method of this invention has clear process steps and well-defined parameters. The tooling used is easy to manufacture and promote. No special high-end equipment is required during the processing. It can realize the batch processing of aerospace-grade vulcanized rubber sealing surfaces, improve production efficiency, reduce production costs, and provide technical support for the large-scale production of aerospace-grade equipment such as satellite propulsion systems. It is suitable for mass production. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a flowchart illustrating the processing of the present invention; Figure 2 This is a schematic diagram of the sealing surface of the vulcanized rubber valve core of the present invention; Figure 3 for Figure 2 Schematic diagram of the cross section of AA; Figure 4 This is a schematic diagram of the tool feed process for turning the base metal in this invention; Figure 5 This is a schematic diagram of the rubber cutting tool of the present invention; Figure 6 This is a schematic diagram of the polishing process of the present invention; Figure 7 This is a diagram showing the installation of sandpaper.

[0024] In the diagram: 1. Metal substrate, 2. Rubber, 3. Tool holder, 4. Tungsten carbide cutting rubber blade, 5. Sandpaper, 6. Sandpaper flat bonding fixture. Detailed Implementation

[0025] 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.

[0026] like Figures 1-7 As shown in Example 1, a method for processing aerospace-grade vulcanized rubber sealing surfaces includes the following steps: S1: Rubber vulcanization: Nano-sized zinc oxide particles are selected as vulcanizing agents, and rubber raw materials are mixed with other compounding agents in proportion. After mixing, the mixture is immediately pressed with the metal matrix 1 and allowed to stand to obtain a vulcanized rubber blank. During vulcanization, the zinc oxide particle size is nano-sized. After mixing, the mixture should be pressed immediately to prevent zinc oxide from precipitating and producing white spots after standing.

[0027] S2: Machining the Metal Substrate 1: The metal substrate 1 on the vulcanized rubber blank is machined using a metal-rubber turning tool, with a machining allowance reserved according to the final dimensional requirements. No cutting fluid is used during the turning process. After each workpiece is machined, the metal-rubber turning tool is rinsed. In step S2, the cutting edge material of the metal-rubber turning tool is cemented carbide, and the reserved machining allowance is 0.01-0.03mm. In step S2, the turning feed direction is a uniform feed along the axis of the metal substrate 1. The metal-rubber turning tool is rinsed after each workpiece is machined to prevent metal dust from adhering to the tool.

[0028] S3: First Cleaning: Fix the workpiece obtained in step S2, placing it rubber-side down in anhydrous ethanol in an ultrasonic cleaner, and turn on the ultrasonic cleaner. After cleaning, observe the rubber surface under a multi-magnification lens for any metallic bright spots. If metallic bright spots are present, determine whether they are embedded in the rubber 2. If the bright spots are embedded in the rubber 2, peel them off; if the bright spots are not embedded in the rubber 2, remove them by gently moving them. After removal, place the workpiece back into the ultrasonic cleaner for a second cleaning. In step S3, the magnifying lens should be at least 30x. Analysis revealed that the bright spots on the rubber surface after processing are composed of base metal, mainly metal powder adhering to the vulcanized rubber sealing surface during machining. If not cleaned promptly, the metal powder will embed into the rubber sealing surface during subsequent polishing of the rubber 2, forming bright spots. The first cleaning can completely prevent the formation of bright spots.

[0029] S4: Turning the rubber surface: The vulcanized rubber blank cleaned in step S3 is turned using a rubber sealing surface removal tool to remove excess rubber material. The processed rubber surface is higher than the metal substrate 1. No cutting fluid is used during the turning process. The rubber sealing surface removal tool includes a tool holder 3 and a tungsten carbide rubber cutting insert 4, which is vertically connected to the tool holder 3. In step S4, the processed rubber surface is 0.08~0.12mm higher than the metal substrate 1, preferably 0.1mm higher.

[0030] S5: Second cleaning: Fix the workpiece processed in step S4 with the rubber side facing down in the ultrasonic cleaner; add clean anhydrous ethanol to the ultrasonic cleaner, turn on the ultrasonic cleaner, and clean for 15 minutes; to prevent small pits from being formed during polishing.

[0031] S6: Polishing the Rubber Surface: Select at least two types of sandpaper 5 with different grits. Soak and rub the coarse and fine sandpaper in anhydrous ethanol. Use the coarse sandpaper for rough polishing, with a feed rate of 0.001~0.008mm, while rinsing the rubber surface with anhydrous ethanol. After rough polishing, replace with fine sandpaper for fine polishing, using the same polishing parameters as for rough polishing, until the roughness of the rubber surface reaches Ra0.4 or higher, completing the process. In step S6, the plane containing the sandpaper 5 is placed perpendicular to the rubber sealing surface. The sandpaper 5 is polished at least 5 times according to the feed rate, i.e., observed under magnification and rinsed with anhydrous ethanol. In step S6, the coarse sandpaper is 3000 grit and the fine sandpaper is 5000 grit. Soaking and rubbing the sandpaper 5 in ethanol prevents sand particles from falling off and embedding in the rubber; ensuring the sandpaper 5 is perpendicular to the rubber surface avoids skewing; graded polishing and precise parameters enable a stable roughness of Ra0.4 or higher, improving the quality of the sealing surface.

[0032] Example 2, a method for processing aerospace-grade vulcanized rubber sealing surfaces, includes the following steps: S1: Rubber vulcanization: Nano-sized zinc oxide is selected as the vulcanizing agent. The rubber raw material is mixed with nano-sized zinc oxide and other compounding agents according to a preset ratio. After the rubber mixing is completed, pressing is performed immediately to prevent zinc oxide precipitation and white spot defects during the standing process. After pressing, vulcanization is performed according to preset vulcanization process parameters to obtain a vulcanized rubber blank. The particle size of the nano-sized zinc oxide is 50-100nm. Zinc oxide with this particle size can be uniformly dispersed in the rubber matrix 2, avoiding uneven vulcanization or white spots caused by particle agglomeration during subsequent processing. The vulcanization process parameters are: vulcanization temperature 150-160℃, vulcanization pressure 5-8MPa, vulcanization time 15-20min. This parameter range can ensure that the rubber 2 is fully vulcanized to form a stable cross-linked structure, while avoiding the performance degradation of the rubber 2 due to over-vulcanization.

[0033] S2: Machining metal substrate 1: Use a metal rubber turning tool to machine the metal substrate 1, leaving a machining allowance of 0.01-0.03mm according to the final size requirements; cutting fluid is not allowed to be used during the turning process. After each workpiece is machined, the metal rubber turning tool is rinsed to remove the metal shavings attached to the tool and prevent them from affecting the quality of the rubber sealing surface in subsequent machining.

[0034] Specifically, the cutting edge material of the metal-rubber turning tool is cemented carbide, with a rake angle of 5°-10° and a clearance angle of 8°-12°. This design reduces the cutting force on the metal substrate 1 during turning, preventing deformation of the metal substrate 1, while improving the tool's wear resistance and cutting efficiency. The turning feed direction is a uniform feed along the axis of the metal substrate 1, with a feed speed of 0.1-0.2 mm / r and a spindle speed of 300-500 r / min. These parameter settings ensure the machining accuracy of the metal substrate 1 and prevent excessive surface roughness due to excessive feed speed or spindle speed.

[0035] Step 3: First Cleaning: Use a cleaning fixture to fix the workpiece processed in Step 2, placing it with the rubber side down in the ultrasonic cleaner; add clean anhydrous ethanol as the cleaning medium to the ultrasonic cleaner, turn on the ultrasonic cleaner, and clean for 15 minutes; after cleaning, observe the rubber surface under a 30x magnifying glass for any metallic bright spots; if metallic bright spots are present, determine whether the bright spots are embedded in the rubber 2: if the metallic bright spots are embedded in the rubber 2, use a peeling fixture to peel them off; if the metallic bright spots are not embedded in the rubber 2, use a prying fixture to pry them off; then put the workpiece back into the ultrasonic cleaner for a second cleaning to ensure that there are no metallic impurities remaining on the rubber surface. Preferably, the ultrasonic cleaner has a power of 300-500W and a frequency of 40kHz. These parameters can generate sufficiently strong ultrasonic waves to cause the anhydrous ethanol to vibrate violently, effectively removing impurities such as metal powder adhering to the rubber surface, while avoiding damage to the rubber surface due to excessive power.

[0036] Furthermore, the cleaning fixture is fixed on the machine tool, and the cleaning fixture is provided with a positioning groove that matches the shape of the workpiece. The workpiece is fixed in the positioning groove to ensure that the workpiece does not shift during the cleaning process, and the rubber surface always remains facing downwards to ensure the cleaning effect.

[0037] Step 4: Turning the Rubber Surface: The vulcanized rubber blank is turned using a rubber sealing surface removal tool to remove excess rubber material, making the rubber surface 0.1mm higher than the metal substrate 1. Cutting fluid is not allowed during the entire turning process to prevent residual cutting fluid from affecting subsequent machining quality. The rubber sealing surface removal tool includes a tool holder 3 and a tungsten carbide rubber cutting insert 4. The cutting edge of the tungsten carbide rubber cutting insert 4 features a rounded transition design with a cutting edge radius of 0.5-1mm, which can prevent tearing or burrs on the rubber surface during turning, ensuring the flatness of the rubber surface. Preferred turning parameters are a spindle speed of 200-300 r / min and a feed rate of 0.05-0.1 mm / r. These parameters reduce the impact force on the rubber surface during turning, preventing deformation or pitting defects.

[0038] Step 5: Second Cleaning: Secure the workpiece processed in Step 4 using the cleaning fixture again, placing it rubber-side down in the ultrasonic cleaner. Add clean anhydrous ethanol to the ultrasonic cleaner, turn it on, and clean for 15 minutes to remove rubber debris and other adhering substances generated during the turning process, preventing these adhering substances from causing pits on the rubber surface during subsequent polishing. The ultrasonic cleaner parameters used in this cleaning are the same as in Step 3 to ensure consistent cleaning results.

[0039] Step Six: Polishing the Rubber Surface: Preparation before polishing: Select two sizes of sandpaper, 3000 grit and 5000 grit. Soak the sandpaper in anhydrous ethanol for 10-15 minutes, then rub and wash it to remove the sand particles that are easy to fall off the sandpaper and prevent the sand particles from falling off and embedding into the rubber surface during the polishing process. Polishing fixture installation: Fix the pre-treated sandpaper 5 onto the polishing fixture. The polishing fixture can ensure that the sandpaper 5 is perpendicular to the rubber sealing surface, and prevent the rubber surface from tilting during the polishing process. Polishing Operation: First, use 3000-grit sandpaper for rough polishing. Set the spindle speed to 900 rpm and the sandpaper feed rate to 0.005 mm. After every 5 feeds, observe the surface condition of the rubber surface using a handheld magnifying glass. Simultaneously, rinse the rubber surface with a spray bottle containing anhydrous ethanol to remove polishing debris. After polishing with 3000-grit sandpaper, switch to 5000-grit sandpaper for fine polishing. Use the same polishing parameters as for rough polishing until the surface roughness of the rubber reaches Ra0.4 or higher, and the flatness meets the design requirements. Cutting fluid is not allowed during the entire polishing process to prevent it from affecting the surface quality and performance of the rubber surface.

[0040] Furthermore, the polishing fixture can adjust the height and angle of the sandpaper 5 holder to ensure that the sandpaper 5 is perpendicular to the rubber sealing surface. The sandpaper 5 holder is equipped with an elastic clamping device to firmly fix the sandpaper 5 and prevent the sandpaper 5 from shifting during the polishing process.

[0041] Example 3, a method for processing aerospace-grade vulcanized rubber sealing surfaces, includes the following steps: Step 1: Rubber vulcanization. Analysis revealed that the white spots on the processed rubber surface are composed of zinc oxide, mainly the oxidant added during rubber vulcanization 2; the zinc oxide particle size is required to be nano-sized during vulcanization, and pressing should be performed immediately after rubber mixing to prevent zinc oxide from precipitating and causing white spots after standing; Step Two: Machining the Metal. Use a metal-rubber cutting tool to remove material from the base metal, leaving a allowance of 0.01-0.03mm according to the final dimensional requirements. Cutting fluid is not allowed throughout the process. Rinse the metal-rubber cutting tool after each piece to prevent metal dust from adhering to the tool. See the infeed direction... Figure 2 ; Step 3: Cleaning. Analysis revealed that the bright spots on the rubber surface after processing were composed of base metal, mainly metal powder adhering to the vulcanized rubber sealing surface during machining. If not cleaned promptly, the metal powder would embed into the rubber sealing surface during subsequent polishing of rubber 2, forming bright spots. Using a cleaning fixture, the rubber surface was placed face down in an ultrasonic cleaner containing clean anhydrous ethanol. The ultrasonic cleaner was used for 15 minutes. The surface was then observed under a 30x magnifying glass for any metallic bright spots. If bright spots were found, it was determined whether they were embedded in rubber 2. If embedded, the bright spots were peeled off using the fixture; otherwise, they were moved using the fixture, and the cleaning was repeated.

[0042] Step 4: Machining Rubber 2. Use a rubber sealing surface trimmer to remove excess rubber, ensuring the rubber surface is 0.1mm higher than the metal substrate 1; cutting fluid is not allowed during the entire process.

[0043] Step 5: Cleaning. Using a cleaning fixture, place the rubber side down in an ultrasonic cleaner. Add clean anhydrous ethanol to the cleaner and ultrasonically clean for 15 minutes to remove any adhering substances from the rubber surface and prevent pitting during polishing.

[0044] Step Six: Polishing the Rubber Surface. Use 3000-grit and 5000-grit sandpaper sequentially for polishing. Before polishing, soak and rub the sandpaper in alcohol to prevent sand particles from becoming embedded in the rubber surface. Maintain a spindle speed of 900 rpm. During polishing, use a fixture to place the sandpaper perpendicular to the rubber sealing surface to prevent skewing. Feed the sandpaper at a rate of 0.005 mm. Observe the rubber surface with a handheld magnifying glass every 5 feeds and rinse the surface with a rubber can filled with alcohol. Cutting fluid is not allowed during the entire polishing process. Additionally, ensure the flatness of the rubber surface. Hand polishing can easily cause tilting or localized annular depressions; therefore, a fixture is designed for polishing.

[0045] A method for processing aerospace-grade vulcanized rubber sealing surfaces has been developed. Through optimized design of key processes such as vulcanization, metal substrate machining, cleaning, rubber turning, and polishing, this method successfully overcomes many shortcomings of existing technologies, achieving mass production of aerospace-grade vulcanized rubber sealing surfaces with high roughness, high flatness, and no defects. This method is not only applicable to satellite propulsion systems but can also be widely used in other aerospace-grade equipment such as spacecraft attitude control systems and deep space probe propulsion systems, as well as in aviation, aerospace, and military fields with extremely high sealing performance requirements. The processing method is mature, easy to operate, and cost-controllable. The tooling and equipment used are easy to promote, effectively improving the processing and manufacturing level of aerospace-grade rubber seals in my country, providing strong technical support for the development of my country's aerospace industry, and possessing broad industrial application prospects and significant economic and social benefits.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for processing aerospace-grade vulcanized rubber sealing surfaces, characterized in that, Includes the following steps: S1: Rubber vulcanization: Nano-sized zinc oxide particles are selected as vulcanizing agents. Rubber raw materials and other compounding agents are mixed in proportion. After mixing, the rubber is immediately pressed with the metal matrix (1) and left to stand to obtain vulcanized rubber blank. S2: Machining the metal substrate (1): The metal substrate (1) on the vulcanized rubber blank is machined using a metal rubber turning tool, and the machining allowance is reserved according to the final size requirements; no cutting fluid is used during the turning process, and the metal rubber turning tool is rinsed after each workpiece is machined. S3: First cleaning: Fix the workpiece obtained in step S2, place it with the rubber side down in the anhydrous ethanol of the ultrasonic cleaner, and turn on the ultrasonic cleaner for cleaning; After cleaning, observe whether there are any metal bright spots on the rubber surface under a multi-magnification lens; If there are metal bright spots, determine whether the bright spots are embedded in the rubber (2): If the metal bright spots are embedded in the rubber (2), peel them off. If the metal spot is not embedded in the rubber (2), remove it by moving it; after removal, put the workpiece back into the ultrasonic cleaner for cleaning again; S4: Turning the rubber surface: The vulcanized rubber blank cleaned in step S3 is turned using a rubber sealing surface removal tool to remove excess rubber material. The processed rubber surface is higher than the metal substrate (1). No cutting fluid is used during the turning process. S5: Second cleaning: Fix the workpiece processed in step S4 with the rubber side facing down in the ultrasonic cleaner; add clean anhydrous ethanol to the ultrasonic cleaner, turn on the ultrasonic cleaner, and perform the second cleaning. S6: Polishing the rubber surface: Select at least two types of sandpaper (5) with different coarse and fine grits. Soak and rub the coarse and fine sandpaper in anhydrous ethanol. Use the coarse sandpaper for rough polishing. The feed rate of the coarse sandpaper is 0.001~0.008mm. At the same time, rinse the rubber surface with anhydrous ethanol. After the rough polishing is completed, replace the fine sandpaper for fine polishing. The polishing parameters are the same as those for rough polishing. Continue until the roughness of the rubber surface reaches Ra0.4 or higher to complete the processing.

2. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S1, the particle size of the nano-sized oxide particles is 50-100 nm.

3. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S1, during the mixing process, the vulcanization temperature is 150-160℃, the vulcanization pressure is 5-8MPa, and the vulcanization time is 15-20min.

4. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S2, the cutting edge material of the metal rubber lathe tool is cemented carbide, and the machining allowance is 0.01-0.03mm.

5. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S2, the turning feed direction is a uniform feed along the axis of the metal substrate (1).

6. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S3, the magnifying glass is at least a 30x magnifying glass.

7. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S4, the rubber sealing surface measuring tool includes a tool holder (3) and a tungsten carbide cutting rubber blade (4), with the tungsten carbide cutting rubber blade (4) vertically connected to the tool holder (3).

8. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S4, after processing, the rubber surface is 0.08~0.12mm higher than the metal substrate (1).

9. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S6, the plane of the sandpaper (5) is placed perpendicular to the rubber sealing surface. The sandpaper (5) is polished at least 5 times according to the feed rate, that is, the observation is carried out under magnification and rinsed with anhydrous ethanol.

10. The method for processing aerospace-grade vulcanized rubber sealing surfaces according to claim 1, characterized in that: In step S6, the coarse sandpaper is 3000 grit and the fine sandpaper is 5000 grit.

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