Precise manufacturing method of sealing bowl for aviation and sealing bowl

Abstract

The invention relates to the field of machine manufacturing, and discloses a precise manufacturing method of a sealing bowl for aviation and the sealing bowl, and the method comprises the following steps: calculating the size of a blank according to the structural size of the sealing bowl and a thermal change rule at a preset temperature; according to the calculated blank size, a polytetrafluoroethylene bar is adopted for turning to obtain a sealed bowl blank piece, and waterproof abrasive paper is adopted for polishing and removing burrs on the two sharp edges of the bottom and a lip opening of the sealed bowl blank piece; preheating the burr-removed sealing bowl blank, then loading the burr-removed sealing bowl blank into a coining die, pressing according to preset pressure, temperature and time, and taking out the sealing bowl blank part after pressing is completed; after the sealed bowl blank part is cooled, inner and outer lips of the sealed bowl blank part are cut, sharp edges are ground and cut for the second time, and the sealed bowl part is obtained; according to the invention, the smoothness of the lip of the part is obviously improved, and the consistency of the product size and the sealing performance after assembly are ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the field of mechanical manufacturing, and particularly relates to a precision manufacturing method of a sealing bowl for aviation and the sealing bowl. BACKGROUND

[0002] The sealing performance of an aero-engine and an accessory system directly determines the operation safety and reliability of the whole machine. As a key sealing part, the sealing bowl bears the core functions of preventing oil leakage and ensuring air path sealing, and the performance stability of the sealing bowl is crucial to the long-term and efficient operation of the aero-engine. The cross-sectional structure of the sealing bowl is in a "U" shape, and the material of the sealing bowl is polytetrafluoroethylene material with excellent self-lubricating performance to adapt to the harsh working conditions in the aviation field. Meanwhile, to ensure the sealing effect, the sealing bowl has extremely high requirements on the appearance flatness, surface roughness and tolerance of key dimensions. Any slight size deviation or surface defect may lead to sealing failure and further cause aero-engine failure.

[0003] At present, the conventional manufacturing method for the sealing bowl in the industry is a "numerical control lathe one-time machining forming method", and the specific machining process is as follows: first, a polytetrafluoroethylene bar is used as raw material, and a rough turning outer circle process is performed on a numerical control lathe to remove the excess material on the surface of the bar to preliminarily form the outer circle contour; then, a fine turning outer circle process is performed to process the outer circle size to the design tolerance range; then, a boring process is performed to process the inner hole structure of the sealing bowl to ensure the coaxiality of the inner hole and the outer circle; then, an end face groove process is performed to process the groove structure of the "U" shaped cross section to form the sealing key part; finally, a cutting process is performed to separate the processed sealing bowl from the bar raw material to obtain a single product. However, the conventional manufacturing method has the following significant defects due to the physical characteristics of the polytetrafluoroethylene material itself, such as large plasticity and low hardness, and the limitations of the process design, which leads to low product qualification rate, prominent quality hidden dangers and difficulty in meeting the high standards in the aviation field: Severe machining deformation: the low hardness and high plasticity characteristics of the polytetrafluoroethylene material make the cutting force of the tool easy to cause irreversible plastic deformation of the part during rough turning, fine turning and boring. The deformation is difficult to correct after deformation, which directly damages the geometric accuracy of the sealing structure; Surface roughness is difficult to guarantee: during turning, cutting vibration is easy to occur between the tool and the workpiece due to the machine operation, and then obvious tool marks are left on the surface of the part. The surface roughness value usually cannot meet the design requirements, which affects the fit of the sealing surface; Size accuracy is significantly affected by cutting heat: turning machining will generate certain cutting heat. Although the polytetrafluoroethylene has poor thermal conductivity, the cutting heat will still cause thermal expansion of the part in the clamped state. After the part cools down, size deviation will occur due to thermal contraction, which leads to a large amount of waste products; Potential risks of sealing failure and surface cracking: Microscopic and scanning electron microscopic observation reveals clear cutting tool marks on the surface of the machined sealing bowl. These marks can form tiny gaps, which can easily lead to oil penetration or gas leakage, causing sealing failure. At the same time, the internal stress generated during the cutting process can remain inside the part, which can easily induce surface cracking. Deburring is a difficult and has a high scrap rate: Polytetrafluoroethylene (PTFE) is a soft material, and burrs are easily generated on the edges of parts after machining. When deburring, it is necessary to ensure thorough removal while avoiding damage to the parts. If the tool is not hard enough or the force is too weak, the burrs cannot be completely removed, which will affect the assembly sealing. If the tool is too hard or the force is too strong, it is easy to damage the surface of the parts or cause the "U"-shaped groove to deform, further increasing the scrap rate of the parts.

[0004] In summary, existing methods for manufacturing sealing bowls based on one-time machining on CNC lathes are limited by both material properties and process design, making it difficult to solve problems such as machining deformation, low dimensional accuracy, poor surface quality, and deburring. This results in low product qualification rates and prominent quality risks, failing to meet the high-performance requirements of aero-engines for sealing bowls. Therefore, a new manufacturing method that can overcome the above-mentioned technical bottlenecks is urgently needed. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the present invention aims to provide a precision manufacturing method and sealing bowl for aviation applications, so as to solve the technical problems of processing deformation, low dimensional accuracy, poor surface quality and deburring caused by the dual limitations of material properties and process design in the prior art.

[0006] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a method for precision manufacturing of a sealing bowl for aerospace applications, comprising the following processes: Calculate the blank size based on the structural dimensions of the sealed bowl and the thermal deformation law at the preset temperature; Based on the calculated blank dimensions, a polytetrafluoroethylene rod is used to perform turning steps to obtain the sealing bowl blank, wherein the temperature is controlled and cutting residues are treated during the machining process. Use wet sandpaper to sand away the burrs on the two sharp edges at the bottom and the lip of the sealing bowl blank; After deburring, the sealing bowl blank is preheated and placed into the precision mold. It is pressed according to the preset pressure, temperature and time. After pressing, the sealing bowl blank is taken out. After the sealing bowl blank part has cooled down, the inner and outer lips of the sealing bowl blank part are cut, and the cutting sharp edges are ground a second time to obtain the sealing bowl part. The appearance of the parts is inspected using a stereomicroscope and strong light transmission, and the key dimensions of the sealing bowl parts are tested. Once the sealing bowl parts pass the inspection, the manufacturing of the sealing bowl parts is completed.

[0007] Preferably, the preset temperature is 160±3℃; when calculating the blank size, the extrusion amount of the blank size is 5% to 10%.

[0008] Preferably, in the process of obtaining the sealing bowl blank by turning polytetrafluoroethylene rods according to the calculated blank size, the turning steps include rough and finish turning of the outer diameter, drilling, boring, turning the end face groove, and cutting off. Carbide cutters are used in the turning steps, the high speed range of cutting is n=2000-2500r / min, the low feed range is f=0.01-0.03mm / r, the machining temperature range is 15~25℃, and the temperature is controlled by spraying coolant directly onto the tool tip. After each sealing bowl blank is machined, the cutting wire wrapped around the tool is blown off with a compressed air gun.

[0009] Preferably, the burrs on the bottom two sharp edges and the lip of the sealing bowl blank are removed by sanding with wet sandpaper, with the grit range of wet sandpaper being 180-200 grit.

[0010] Preferably, the deburred sealing bowl blank is preheated and then placed into the precision pressing mold. It is pressed according to the preset pressure, temperature and time. After pressing, the sealing bowl blank is taken out and preheated on the heating plate of the flat vulcanizing machine. The temperature range is 160±3℃ and the time is 15 to 16 minutes. During preheating, the sealing bowl blank is placed close to the precision pressing mold.

[0011] Preferably, the structure of the precision molding die includes a first template, a core, a second template, and a third template; The first template, the second template, and the third template are sequentially fitted onto the core from bottom to top. The inner working surface of the second template, the bottom working surface of the third template, and the stepped surface of the core form a working surface gap area. The sealing bowl blank is fitted onto the core and located within the working surface gap area. The top lip of the sealing bowl blank contacts the bottom working surface of the third template, the side wall of the sealing bowl blank contacts the inner working surface of the second template, and the bottom of the sealing bowl blank contacts the stepped surface of the core. A thermometer is provided on the second template to monitor the temperature inside the precision die.

[0012] Furthermore, the bottom working surface of the third template is set as a plane, so that the top lip end of the sealing bowl blank is relatively flush.

[0013] Preferably, after the sealing bowl blank part has cooled, the inner and outer lips of the sealing bowl blank part are cut using a lip cutting machine; wherein, the fixture of the lip cutting machine is machined from 2A12 aluminum bar, the fixture is provided with a U-shaped groove that matches the final lip and height dimensions of the part, the bottom of the groove is provided with several ￠2mm air holes, the surface roughness of the working surface is ≤Ra0.8μm, and the part is clamped by a pneumatic device.

[0014] Preferably, the sharp edges of the sealing bowl blank are removed by using wet sandpaper during the secondary grinding and cutting process.

[0015] Secondly, the present invention also provides a sealing bowl, which is obtained by the above-described precision manufacturing method of an aviation sealing bowl, wherein the two ends of the top lip of the sealing bowl are flush.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a precision manufacturing method for sealing bowls used in aviation. By controlling the processing environment temperature, machine tool speed, feed rate, tool material, and tool life, the surface finish of the parts is improved from the source, reducing roughness and preventing micro-cracks. The deburring machine is used with a matching deburring fixture to ensure deburring quality while improving deburring efficiency. By adding a precision pressing process on a flat vulcanizing machine and designing and manufacturing a matching precision pressing die, the turning deformation problem of the parts is effectively corrected, stabilizing dimensions while improving the consistency of part wall thickness and surface finish through a 5%–10% hot extrusion amount. Using a rubber cup cutting machine to cut the lip of the part instead of manual grinding ensures the final height dimension of the part, increasing processing efficiency by more than 6 times and significantly improving the surface finish of the part lip, thus ensuring product dimensional consistency and sealing performance after assembly. Attached Figure Description

[0017] Figure 1 This is a flowchart of the precision manufacturing method of the sealing bowl for aviation applications in an embodiment of the present invention; Figure 2 This is a schematic diagram of the precision pressing mold in an embodiment of the present invention; Figure 3 This is a structural diagram of the sealing bowl in an embodiment of the present invention; In the diagram: 1. First template; 2. Core; 3. Second template; 4. Third template; 5. Thermometer. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a precision manufacturing method for sealing bowls for aviation applications and a sealing bowl, so as to solve the technical problems of processing deformation, low dimensional accuracy, poor surface quality and deburring caused by the dual limitations of material properties and process design in the prior art.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 See Figure 1 In one embodiment of the present invention, a precision manufacturing method for aerospace sealing bowls is provided, which controls the processing quality of parts at each stage of the processing to prevent workpiece deformation and cracking, and improves structural dimensional stability and sealing reliability, including the following processes: Step 1: Calculate the blank size based on the structural dimensions of the sealed bowl and the thermal deformation law at the preset temperature; Specifically, the blank size is calculated based on the part's structure, dimensions (inner, outer and bottom dimensions of the workpiece cross-section) and its thermal deformation law at (160±3)℃, ensuring that the part has a 5% to 10% extrusion amount during the hot pressing process, and the mold ensures the final wall thickness of the part.

[0021] In this embodiment, the preset temperature (160±3℃) is perfectly matched with the pressing temperature of the subsequent precision pressing process, which can avoid the deviation in size calculation caused by the "mismatch between the thermal change law of the blank and the precision pressing temperature". This solves the problem of "uncontrollable shrinkage of parts after hot pressing" in traditional manufacturing, and ensures that the size of the parts after precision pressing can accurately fall within the design tolerance range. The 5% to 10% extrusion allowance design ensures that the PTFE material has sufficient fluidity to fill the gaps in the working surface of the precision die during precision pressing, avoiding defects such as "material shortage" and "bubbles". It also prevents the parts from becoming excessively thin or generating internal stress due to excessive extrusion, thus laying the foundation for the stability of subsequent sealing performance.

[0022] Step 2: Based on the calculated blank size, a polytetrafluoroethylene rod is used for turning to obtain the sealing bowl blank. During the machining process, the temperature is controlled and cutting residues are treated. Specifically, according to the process blank drawing, the polytetrafluoroethylene rod is clamped on a CNC lathe in one go to complete all the steps of rough and fine turning the outer diameter, drilling, boring, turning the end face groove, and cutting.

[0023] The above machining process uses carbide cutters with sharp cutting edges. The cutting speed is high (n=2000r / min), low (f=0.01mm / r), and the tool life is 500 pieces / tool. This effectively controls turning deformation, reduces workpiece surface roughness, and prevents turning cracks from forming on the workpiece surface.

[0024] Because polytetrafluoroethylene (PTFE) has a low heat capacity and poor thermal conductivity, the machining process is carried out at room temperature (15-25°C). The coolant is sprayed towards the tip of the tool, and after each part is machined, the cutting wire wrapped around the tool is blown off with compressed air.

[0025] Step 3: Use wet sandpaper to sand away the burrs on the two sharp edges at the bottom and the lip of the sealing bowl blank. Specifically, deburring is performed in two steps on the deburring machine.

[0026] The first step is to use 180-grit or higher wet sandpaper to remove the burrs on the two sharp edges at the bottom of the part. The above process uses a special deburring fixture, which is installed on the chuck of the deburring machine. When clamping, the bottom of the workpiece cavity is in close contact with the end face of the deburring fixture. The wall thickness of the fixture should match the tightness of the bottom of the workpiece cavity. The fixture should rotate with the motor when it is working and should not fall off during the grinding process.

[0027] The second step is to use 180-grit or higher wet sandpaper to remove burrs from the lip of the part. The above process uses a special deburring fixture. When clamping, the bottom and inner wall of the workpiece should fit against the stepped surface of the deburring fixture. The outer diameter of the fixture step should match the inner diameter of the workpiece. The workpiece should rotate with the fixture when the motor is working and should not fall off during the grinding process.

[0028] Step 4: After preheating the deburred sealing bowl blank, place it into the precision pressing mold and press it according to the preset pressure, temperature and time. After pressing, take out the sealing bowl blank. Specifically, the part blank is placed on the heating plate of the flat vulcanizing machine and dried and preheated near the mold. The preheating temperature is (160±3)℃ and the preheating time is (15~16) minutes.

[0029] Place one side of the blank end face into the precision die cavity, gently press and flatten it with a tool, and then close the die. After manually closing the die, press the die firmly by hand first, and then apply pressure with the machine. This avoids defects such as material shortage, excessive local stress, cracks and wrinkles on the surface of the part caused by uneven placement.

[0030] Specifically, the structure of the precision pressing mold includes a first template 1, a core 2, a second template 3, and a third template 4; the first template 1, the second template 3, and the third template 4 are sequentially fitted onto the core 2 from bottom to top; the inner sidewall working surface of the second template 3, the bottom working surface of the third template 4, and the stepped surface of the core 2 form a working surface gap area; the sealing bowl blank is fitted onto the core 2 and located within the working surface gap area, wherein the top lip end of the sealing bowl blank contacts the bottom working surface of the third template 4, the sidewall of the sealing bowl blank contacts the inner sidewall working surface of the second template 3, and the bottom of the sealing bowl blank contacts the stepped surface of the core 2; wherein a thermometer 5 is provided on the second template 3 for monitoring the temperature inside the precision pressing mold.

[0031] In this embodiment, the structure of the templates being nested sequentially from bottom to top and the design of the gap area of ​​the working surface enable the blank to be precisely embedded in the gap between the core and the template, ensuring that the top lip, side wall, and bottom of the blank are completely fitted with the working surface of the mold, avoiding uneven wall thickness caused by positioning deviation, and ensuring the geometric consistency of each batch of parts.

[0032] The bottom working surface of the third template 4 is set as a plane, which is used to make the top lip end of the sealing bowl blank relatively flush.

[0033] In this embodiment, the design of the bottom plane of the third template 4 can apply uniform pressure to the lip of the blank during precision pressing, ensuring that the height difference between the two ends of the lip is ≤0.01mm, achieving the design requirement of flush sealing surface, and structurally eliminating the sealing hazards caused by uneven lip.

[0034] In this embodiment, the coaxiality of all working surfaces relative to the mold center is no greater than 0.02 mm, and the surface roughness of the working surfaces is no higher than Ra0.2 μm. During operation, the core 2 is tightly fitted with the first template 1 (H7 / n6), slides with the second template 3 (G7 / h7), and slides with the third template 4 (H7 / f7). The flatness of the upper and lower end faces of the entire mold is no greater than 0.01 mm. The second template 3 has a thermometer hole with a depth of 40 mm and a diameter of ￠8 at a distance of 15×15 from the end face for inserting a thermometer 5.

[0035] In this embodiment, the pressure of the flat vulcanizing machine is set to 5T, the temperature to (160±3)℃, and the time to 15 minutes. The thermometer 5 is used to observe the mold temperature. After the mold temperature reaches (160±3)℃, the blank is installed and the mold is closed according to the mold installation requirements in step (2). During the pressing process, the temperature change of the mold is observed through the thermometer 5 to prevent the temperature from being too high or too low, which would affect the quality of the product.

[0036] After the mold is opened, use compressed air to blow out the parts or use flat-headed bamboo skewers to remove them to prevent deformation.

[0037] Step 5: After the sealing bowl blank part has cooled down, the inner and outer lips of the sealing bowl blank part are cut, and the cutting sharp edges are ground a second time to obtain the sealing bowl part. Specifically, after the part cools, it is placed in the lip-cutting machine fixture slot. The pneumatic device is activated to clamp the part, and the tool and motor speeds are adjusted to cut the inner and outer lips of the sealing cup in one pass, ensuring that the height of the part is consistent with the height of the inner and outer lips. The fixture is machined from aluminum bar 2A12, and the U-shaped groove dimensions are consistent with the final lip and height dimensions of the part. The bottom of the groove has 6 ￠2 air holes, and the surface roughness is no higher than Ra0.8μm. The tool is a self-sharpening carbide tool with a sharp cutting edge. The secondary grinding of the cutting edges uses wet sandpaper to remove the sharp edges of the sealing cup blank.

[0038] Step 6: Inspect the appearance of the parts using a stereomicroscope and strong light transmission, and check the key dimensions of the sealing bowl parts. Once the sealing bowl parts pass the inspection, the manufacturing of the sealing bowl parts is completed.

[0039] In this embodiment, under a 15x stereomicroscope, the part is tilted at an angle of about 45° to the horizontal direction and rotated to inspect the surface of the part. No defects such as bubbles, scratches, or burrs are allowed. No impurities or tool marks are allowed on the working surface and in the groove at R0.5. Non-penetrating impurities no larger than 0.2 mm are allowed on the other surfaces. The distance between impurities is not less than 5 mm. The total number of impurities on each part is no more than 3.

[0040] Perform a translucent visual inspection under strong light above 1000Lx. Parts are not allowed to have cracks or delamination, and the lip should be kept smooth and sharp.

[0041] Specifically, the diameter of the inner and outer lip tips of the part is measured using an O-ring size measuring instrument, the height of the part is measured using a digital caliper, the thickness of the inner and outer walls is measured using a digital caliper, and the thickness of the bottom is measured using a digital dial indicator at no less than 12 points evenly distributed along the circumference.

[0042] In summary, the precision manufacturing method for aerospace sealing bowls provided in this embodiment improves the surface finish of parts from the source by controlling the processing environment temperature, machine tool speed, feed rate, tool material, and tool life, reducing roughness and preventing micro-cracks. By using a deburring machine with a matching deburring fixture, the deburring quality is ensured while improving deburring efficiency. By adding a precision pressing process on a flat vulcanizing machine and designing and manufacturing a matching precision pressing die, the turning deformation problem of the parts is effectively corrected, stabilizing dimensions while improving the consistency of part wall thickness and surface finish through a 5%–10% hot extrusion amount. Using a rubber cup cutting machine to cut the lip of the part instead of manual grinding ensures the final height dimension of the part, increasing processing efficiency by more than 6 times and significantly improving the surface finish of the part lip, thus ensuring product dimensional consistency and post-assembly sealing performance.

[0043] Example 2 This embodiment also provides a sealing bowl, which is obtained by the above-described precision manufacturing method for an aviation sealing bowl, wherein the two ends of the top lip of the sealing bowl are flush.

[0044] Based on the high-precision manufacturing process described above, the sealing bowl obtained in this embodiment has the core advantages of high dimensional accuracy, excellent surface quality, and flush lip, which can effectively avoid the sealing failure caused by dimensional deviation and uneven lip of traditional sealing bowls. This sealing bowl can adapt to the harsh operating conditions of "high-pressure gas circuit and lubricating oil sealing" of aero engines, reduce engine maintenance costs and safety risks caused by sealing component failure, and significantly improve the operational stability of aero engine accessory systems.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for precision manufacturing of a sealing bowl for aviation applications, characterized in that, The process includes the following: Calculate the blank size based on the structural dimensions of the sealed bowl and the thermal deformation law at the preset temperature; Based on the calculated blank dimensions, a polytetrafluoroethylene rod is used to perform turning steps to obtain the sealing bowl blank, wherein the temperature is controlled and cutting residues are treated during the machining process. Use wet sandpaper to sand away the burrs on the two sharp edges at the bottom and the lip of the sealing bowl blank; After deburring, the sealing bowl blank is preheated and placed into the precision mold. It is pressed according to the preset pressure, temperature and time. After pressing, the sealing bowl blank is taken out. After the sealing bowl blank part has cooled down, the inner and outer lips of the sealing bowl blank part are cut, and the cutting sharp edges are ground a second time to obtain the sealing bowl part. The appearance of the parts is inspected using a stereomicroscope and strong light transmission, and the key dimensions of the sealing bowl parts are tested. Once the sealing bowl parts pass the inspection, the manufacturing of the sealing bowl parts is completed.

2. The precision manufacturing method of an aviation sealing bowl according to claim 1, characterized in that, The preset temperature is 160±3℃; when calculating the blank size, the extrusion amount of the blank size is 5% to 10%.

3. A method for precision manufacturing of an aerospace sealing bowl according to claim 1, characterized in that, In the process of obtaining the sealing bowl blank by turning polytetrafluoroethylene rods according to the calculated blank size, the turning steps include rough and finish turning of the outer diameter, drilling, boring, turning the end face groove, and cutting off. Carbide cutters are used in the turning steps, the high cutting speed range is n=2000-2500r / min, the low feed range is f=0.01-0.03mm / r, the machining temperature range is 15~25℃, and the temperature is controlled by spraying coolant directly onto the tool tip. After each sealing bowl blank is machined, the cutting wire wrapped around the tool is blown off with a compressed air gun.

4. The precision manufacturing method of an aviation sealing bowl according to claim 1, characterized in that, When using wet sandpaper to remove burrs from the two sharp edges at the bottom and the lip of the sealing bowl blank, the grit of the wet sandpaper ranges from 180 to 200.

5. A method for precision manufacturing of an aerospace sealing bowl according to claim 1, characterized in that, The sealing bowl blank, after being deburred, is preheated and placed into a precision pressing mold. It is then pressed according to a preset pressure, temperature, and time. After pressing, the sealing bowl blank is removed and preheated on the heating plate of a flat vulcanizing machine at a temperature range of 160±3℃ for 15 to 16 minutes. During preheating, the sealing bowl blank is placed close to the precision pressing mold.

6. The method for precision manufacturing of an aviation sealing bowl according to claim 1, characterized in that, The structure of the precision molding die includes a first template (1), a core (2), a second template (3), and a third template (4); The first template (1), the second template (3) and the third template (4) are sequentially fitted onto the core (2) from bottom to top; the inner working surface of the second template (3), the bottom working surface of the third template (4) and the step surface of the core (2) form a working surface gap area between them. The sealing bowl blank is fitted onto the core (2) and located in the working surface gap area. The top lip of the sealing bowl blank is in contact with the bottom working surface of the third template (4), the side wall of the sealing bowl blank is in contact with the inner working surface of the second template (3), and the bottom of the sealing bowl blank is in contact with the step surface of the core (2). A thermometer (5) is provided on the second template (3) to monitor the temperature inside the precision mold.

7. The method for precision manufacturing of an aerospace sealing bowl according to claim 6, characterized in that, The bottom working surface of the third template (4) is set as a plane, so that the top lip end of the sealing bowl blank is relatively flush.

8. A method for precision manufacturing of an aerospace sealing bowl according to claim 1, characterized in that, After the blank part of the sealing bowl is cooled, the inner and outer lips of the blank part are cut using a lip cutting machine. The fixture of the lip cutting machine is made of 2A12 aluminum bar and has a U-shaped groove that matches the final lip and height dimensions of the part. The bottom of the groove has several ￠2mm air holes and the surface roughness of the working surface is ≤Ra0.8μm. The part is clamped by a pneumatic device.

9. The precision manufacturing method of an aviation sealing bowl according to claim 1, characterized in that, The sharp edges of the sealing bowl blank are removed by using wet sandpaper during the secondary grinding and cutting process.

10. A sealed bowl, characterized in that, The sealing bowl for aviation applications is obtained by a precision manufacturing method according to any one of claims 1-9, wherein both ends of the top lip of the sealing bowl are flush.

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