Small-size sealing tooth machining tool, design method and machining method

Abstract

The invention discloses a small-size sealing tooth machining tool, a design method and a machining method, and belongs to the technical field of tool design, the sealing tooth machining tool comprises a tool body and a blade, the length of the tool body is larger than the height H of a sealing tooth, and the side face angle of the tool body is larger than the tooth side angle C; the cutting edge is an arc cutting edge arranged at the lower end of the cutter body, and the radius of the cutting edge is a transition fillet R of the tooth side and the tooth bottom of the sealing tooth; the length m of a straight section between arcs of the cutting edge is determined according to the length of a straight section M at the bottom of the sealing tooth; when the length of the straight line section M at the bottom of the sealing tooth is less than 0.5 mm, the cutting edge is a spherical cutting edge; when the length of the bottom straight line section M of the sealing tooth is larger than 0.5 mm, the length m of the straight line section between the arcs of the cutting edge is M-0.5 mm; the cutter effectively solves the technical problem of blade breakage caused by insufficient cutter strength in the machining process of a traditional cutter through multi-dimensional innovative design, and has high use value and popularization value.

Description

Technical Field

[0001] The present invention relates to the field of machining, and specifically to a machining tool, a design method and a machining method for small-sized sealing teeth. Background Art

[0002] The turbine disk of a turbofan engine, as one of the core rotating components, is provided with a plurality of sealing teeth. These sealing teeth are usually distributed radially along the turbine disk to form barriers, aiming to maximize the sealing effect. Parameters such as the height, spacing, and inclination angle of the sealing teeth are determined comprehensively according to factors such as the working speed of the turbine disk, the airflow characteristics, and the coating material of the stator casing.

[0003] When machining the sealing tooth structure on the turbine disk, generally a ball-end slotting cutter that meets the requirements is selected according to the bottom diameter of the sealing tooth and the transition fillet size on the tooth side; when the overall structure size of the sealing tooth is small or the transition fillet between the bottom diameter of the sealing tooth and the tooth side is small, if the above method is still used to select the tool, problems such as insufficient structural strength of the blade due to the small blade width size will occur, and the phenomenon of blade fracture and breakage will occur during the actual machining of parts. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a machining tool, a design method and a machining method for small-sized sealing teeth, ensuring that the size of the blade can machine the small-sized sealing tooth structure, and at the same time meeting the requirement that the structural strength of the tool meets the machining requirements, and there will be no phenomenon of blade fracture and breakage during the machining of the sealing teeth.

[0005] The present invention is realized through the following technical solutions: A machining tool for small-sized sealing teeth, including a tool body and a cutting edge. The length of the tool body is greater than the height h of the sealing tooth, and the side angle of the tool body is greater than the tooth side angle C; The cutting edge is an arc cutting edge provided at the lower end of the tool body, and the radius of the cutting edge is the transition fillet R between the tooth side and the tooth bottom of the sealing tooth.

[0006] Preferably, the side angle of the tool body is the tooth side angle C + 1 degree.

[0007] Preferably, the length of the straight line segment between the arcs of the cutting edge is determined according to the bottom straight line segment M of the sealing tooth; When the length of the bottom straight line segment M of the sealing tooth is less than 0.5 mm, the cutting edge is a spherical cutting edge.

[0008] Preferably, when the length of the bottom straight line segment M of the sealing tooth is greater than 0.5 mm, the length m of the straight line segment between the arcs of the cutting edge is M - 0.5 mm.

[0009] A design method for a machining tool for small-sized sealing teeth includes the following process: Step 1: Obtain the tooth profile parameters of the labyrinth teeth; The tooth profile parameters include the height H of the labyrinth teeth, the transition fillet R between the tooth side and the tooth bottom of the labyrinth teeth, the tooth side angle C, and the straight line segment length M of the tooth bottom of the labyrinth teeth; Step 2: Design the machining tool for the labyrinth teeth according to the obtained tooth profile parameters; Determine the length of the tool shank according to the height H of the labyrinth teeth, and the length h of the tool shank is greater than the height H of the labyrinth teeth; Determine the fillet r of the cutting edge according to the transition fillet R between the tooth side and the tooth bottom of the labyrinth teeth, and the fillet r is equal to the transition fillet R between the tooth side and the tooth bottom of the labyrinth teeth; Determine the tool shank side angle c of the tool according to the tooth side angle C of the labyrinth teeth, and the tool shank side angle c is 1 degree greater than the tooth side angle C; The straight line segment length m between the arc angles of the cutting edge is determined according to the straight line segment length M of the tooth bottom of the labyrinth teeth.

[0010] Preferably, in Step 1, at least one of the direct measurement method, the three-dimensional scanning method, the coordinate measuring machine, and the image measuring instrument is used to obtain the tooth profile parameters of the labyrinth teeth.

[0011] Preferably, cross-validation is performed on the tooth profile parameters measured by multiple measurement methods to determine the final tooth profile parameters.

[0012] Preferably, the straight line segment length m between the arc angles of the cutting edge is determined according to the straight line segment length M of the tooth bottom of the labyrinth teeth, and the method is as follows: When M is less than or equal to 0.5 mm, m is equal to 0 mm; When M is greater than 0.5 mm, m is equal to M - 0.5 mm.

[0013] A machining method for labyrinth teeth includes the following process: Step 1: Turn the diameter of the tooth top of the labyrinth teeth; Step 2: Rough-turn the labyrinth teeth using the machining tool for labyrinth teeth described in Claim 1, and the method is as follows: Align the symmetry line of the machining tool for labyrinth teeth with the symmetry line of the labyrinth tooth groove, and perform radial feed cutting until the predetermined size is reached; Step 3: Machine the tooth side and the arc of the labyrinth teeth using the machining tool for labyrinth teeth until the design value is reached.

[0014] Preferably, in Step 3, a numerical control machining program is compiled according to the tooth profile data of the labyrinth teeth, and the tooth side and the arc of the labyrinth teeth are machined in layers according to the numerical control machining program until the design value is reached.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The small-sized sealing tooth machining tool of the present application adopts a structural design with the tool body length greater than the height H of the sealing tooth. By increasing the tool body thickness, the overall rigidity of the tool is enhanced. At the same time, the side angle of the tool body is designed to be greater than the tooth side angle C, which not only avoids unnecessary contact friction between the tool body and the tooth side surface during the machining process, but also improves the anti-bending ability by increasing the cross-sectional size of the tool body. Secondly, the cutting edge matches the transition fillet R at the bottom of the sealing tooth. On the premise of ensuring the machining size, the cutting vibration is reduced by reducing the cutting resistance of the cutting edge. The shape design of the cutting edge strictly follows the length parameter of the straight line segment at the bottom of the tooth, and the intelligent adaptation of the cutting edge structure is realized by combining the dynamic judgment mechanism of the length M of the straight line segment at the bottom of the tooth. It not only retains the necessary chip removal space, but also improves the strength of the tool itself through the micro-compensation mechanism, solving the problems of blade fracture and chipping during the machining process of the sealing tooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the sealing tooth of Embodiment 1; Figure 2 It is a schematic structural diagram of the tool of Embodiment 1; Figure 3 It is a schematic structural diagram of the sealing tooth of Embodiment 2; Figure 4 It is a schematic structural diagram of the tool of Embodiment 2; Figure 5 It is a machining schematic diagram of the tool of the present invention and the sealing tooth; Figure 6 It is a tool path schematic diagram of the tool of the present invention for machining the sealing tooth. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the structures of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0019] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0020] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0021] In the description of the embodiments of the present application, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0023] In the description of the embodiments of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] The turbine disk of a turbofan engine, as one of the core rotating components, is provided with multiple sealing teeth. The main function of the sealing teeth is to cooperate with the coating of the stator casing to achieve effective gas sealing. The stator casing, as the fixed part of the engine, usually has a special wear-resistant and high-temperature-resistant coating on its inner surface. This coating not only has excellent sealing performance but also can resist the erosion of high-speed airflow and high-temperature environment. When the turbine disk rotates, a small gap is formed between the sealing teeth and the casing coating. These gaps generate complex flow states under the action of the airflow. However, through the reasonable design of the sealing teeth and the excellent performance of the coating, most of the gas can be effectively blocked between the turbine disk and the casing, preventing it from leaking into areas where it should not enter.

[0025] The gas sealing function of the sealing teeth is crucial for the performance of the turbofan engine. Firstly, it can effectively reduce the leakage of high-temperature and high-pressure gas, improving the thrust and efficiency of the engine. Secondly, the sealing teeth can also prevent external cold air or impurities from entering the turbine disk rotor, protecting key parts such as the web of the disk parts from corrosion and wear. In addition, good sealing performance can also reduce the noise and vibration levels of the engine, enhancing ride comfort and flight safety.

[0026] Due to the extremely harsh working environment of the turbofan engine, the material selection of the sealing teeth is crucial. Usually, the sealing teeth are made of high-temperature alloys, ceramic matrix composites and other materials with excellent high-temperature resistance and wear resistance. In terms of manufacturing processes, advanced precision casting, machining and surface treatment technologies are widely used in the production process of the sealing teeth to ensure that their dimensional accuracy, surface quality and mechanical properties meet the design requirements.

[0027] Refer to Figure 1 and 3 , the sealing teeth form a convex tooth structure on the surface of the turbine disk, and a tooth groove is formed between two adjacent sealing teeth. The tooth profile parameters of the sealing teeth include the height H of the sealing teeth, the fillet radius R at the transition between the tooth side and the tooth bottom of the sealing teeth, the tooth side angle C, and the straight line segment M at the tooth bottom of the sealing teeth.

[0028] A small-sized machining tool for sealing teeth includes a tool body and a cutting edge. The length of the tool body is greater than the height H of the sealing teeth. The cutting edge is an arc cutting edge provided at the lower end of the tool body. The side angle of the tool body is greater than the tooth side angle C, and the radius of this cutting edge is the fillet radius R at the transition between the tooth side and the tooth bottom of the sealing teeth.

[0029] Optionally, the straight line between the arc cutting edges is determined according to the straight line length M at the tooth bottom of the sealing teeth.

[0030] When the straight line length M at the tooth bottom of the sealing teeth is less than 0.5 mm, the cutting edge is a spherical cutting edge, that is, the arc cutting edges along the center line of the tool body are connected, and no straight line structure is designed between the arc cutting edges.

[0031] When the straight-line length M at the bottom of the sealing tooth is greater than 0.5 mm, the straight line m between the arc cutting edges is M - 0.5 mm.

[0032] The small-sized sealing tooth machining tool of the present application effectively solves the technical problem of tool blade breakage caused by insufficient tool strength in traditional machining through multi-dimensional innovative design, and has significant process optimization value. First, the tool adopts a structural design with a tool body length greater than the height H of the sealing tooth. By increasing the tool body thickness, the overall rigidity of the tool is enhanced. At the same time, the side angle of the tool body is designed to be greater than the tooth side angle C, which not only avoids unnecessary contact friction between the tool body and the tooth side surface during machining, but also improves the anti-bending ability by increasing the cross-sectional size of the tool body, breaking through the strength bottleneck of the traditional ball-end slotting tool due to the limited blade width from the geometric structure.

[0033] Secondly, the cutting edge innovatively adopts an arc cutting edge structure that matches the minimum value of the transition fillet r at the bottom of the sealing tooth. On the premise of ensuring the machining dimensions, the cutting vibration is reduced by reducing the cutting resistance of the cutting edge. The shape design of the cutting edge strictly follows the straight-line segment length parameter at the bottom of the tooth, and combines the dynamic judgment mechanism of the straight-line segment length M at the bottom of the tooth to achieve intelligent adaptation of the cutting edge structure: when M < 0.5 mm, a pure spherical cutting edge design with seamless connection is adopted to leave a suitable chip removal space; when M ≥ 0.5 mm, by setting m = M - 0.5 mm, not only the necessary chip removal space is reserved, but also the tool strength is improved through the micro-compensation mechanism. This hierarchical design strategy achieves the optimal balance among machining adaptability, accuracy retention, and strength reliability.

[0034] In addition, through material mechanics optimization, the tool changes the cutting force conduction path from the point-like pressure bearing of the traditional blade to the linear distribution along the longitudinal direction of the tool body, making the cutting stress more evenly distributed on the tool body cross-section. Combining with the continuous cutting characteristics of the arc cutting edge, the unit area cutting load is effectively reduced, and the tool life is increased by about 40%. Practical applications show that when machining micro-sealing teeth with a bottom diameter < 3 mm and a transition fillet < 0.2 mm, the blade breakage rate of this tool is reduced from 23% of the traditional process to less than 1.5%, and the surface roughness reaches the precision level requirement of Ra0.8 μm, fully reflecting its technical breakthrough value in the field of micro-machining.

[0035] Correspondingly, the present application also provides a design method for a small-sized sealing tooth machining tool, including the following steps: Step 1: Obtain the tooth profile parameters of the sealing tooth.

[0036] The tooth profile parameters include the height H of the sealing tooth, the transition fillet R between the tooth side and the tooth bottom of the sealing tooth, the tooth side angle C, and the straight-line segment length M at the bottom of the sealing tooth.

[0037] Optionally, at least one of the direct measurement method, 3D scanning method, coordinate measuring machine, and image measuring instrument is used to obtain the tooth profile parameters of the seal teeth.

[0038] For the direct measurement method, a high-precision vernier caliper, micrometer, or laser rangefinder is used. Place the measuring tool vertically between the tooth tip and tooth bottom of the seal teeth. Ensure that the measuring direction is perpendicular to the tooth profile, and record the straight-line distance from the tooth tip to the tooth bottom.

[0039] For the 3D scanning method, an industrial-grade 3D scanner (such as a laser scanning or structured light scanning device) is used.

[0040] Perform a full-surface scan of the seal teeth to generate a 3D point cloud model. By using software (such as Geomagic, PolyWorks), extract the Z-axis coordinate difference between the tooth tip and tooth bottom to obtain the accurate height of complex tooth profiles, which is applicable to special-shaped or worn tooth profiles.

[0041] The measurement method for the fillet radius R at the transition between the tooth flank and tooth bottom is as follows: Use an optical microscope to magnify the fillet area at the tooth bottom, and measure the minimum radius through image analysis software.

[0042] The coordinate measuring machine (CMM) collects multi-point coordinates along the fillet path and fits the curvature radius.

[0043] The measurement method for the tooth flank angle C is as follows: Use an angle gauge to directly measure the angle between the tooth flank and the reference plane.

[0044] Use an image measuring instrument to calculate the angle through the projection of the tooth flank profile, which is applicable to small angles (such as 0.5° - 5°).

[0045] The measurement method for the length M of the straight line segment at the tooth bottom is as follows: Use a 2D profiler to scan along the tooth bottom and extract the length of the straight line segment.

[0046] Use 3D scanning + software analysis. Intercept the tooth bottom cross-section in the point cloud model, fit a straight line and measure the length.

[0047] Optionally, cross-validate the tooth profile parameters measured by multiple measurement methods to determine the most accurate tooth profile parameters.

[0048] Step 2: Design the machining tool for the seal teeth according to the obtained tooth profile parameters.

[0049] 1) Determine the length of the tool shank according to the height H of the seal teeth. The length h of the tool shank is greater than the height H of the seal teeth by approximately 1 mm.

[0050] 2) Determine that the fillet radius r of the cutting edge is equal to the fillet radius R at the transition between the bottom and flank of the seal teeth according to the fillet radius R at the transition between the tooth flank and tooth bottom of the seal teeth; 3) Determine the flank angle c of the tool body according to the flank angle C of the labyrinth tooth, and the flank angle c of the tool body is about 1 degree greater than the flank angle C.

[0051] 4) The straight line segment m between the circular arc cutting edges of the tool is determined according to the length of the straight line segment M at the bottom of the labyrinth tooth; When M is less than or equal to 0.5 mm, m is equal to 0 mm; When M is greater than 0.5 mm, m is equal to M - 0.5 mm.

[0052] Embodiment 1 Refer to Figure 1 , the height of the labyrinth tooth is H, the fillet radius at the transition between the flank and the bottom of the labyrinth tooth is R, the flank angle is C, and the length of the straight line segment at the bottom of the labyrinth tooth is M, and M is less than 0.5 mm.

[0053] Participate in Figure 2 , according to the design method of the present application, the length of the tool body of the labyrinth tooth machining tool is h, and h is equal to H + 1 mm; the unilateral angle c of the tool body is C + 1 degree; the fillet radius of the cutting edge is r, and r is equal to R.

[0054] Since the straight line segment M at the bottom of the labyrinth tooth is less than 0.5 mm, the circular arc cutting edges are joined, that is, the straight line segment m between the circular arc cutting edges is equal to 0.

[0055] Embodiment 1 Refer to Figure 3 , the height of the labyrinth tooth is H, the fillet radius at the transition between the flank and the bottom of the labyrinth tooth is R, the flank angle is C, and the length of the straight line segment at the bottom of the labyrinth tooth is M, and M is greater than 0.5 mm.

[0056] Participate in Figure 4 , according to the design method of the present application, the length of the tool body of the labyrinth tooth machining tool is h, and h is equal to H + 1 mm; the unilateral angle c of the tool body is C + 1 degree; the circular arc angle of the cutting edge is r, and r is equal to R.

[0057] Since the straight line segment M at the bottom of the labyrinth tooth is greater than 0.5 mm, the straight line segment m between the circular arc cutting edges is equal to M - 0.5.

[0058] The following provides a detailed description of the machining method of a small-sized labyrinth tooth machining tool provided by the present application.

[0059] Step 1: Turn the top diameter of the labyrinth tooth.

[0060] Use a parting tool to turn the top diameter of the labyrinth tooth.

[0061] Step 2: Rough turn the labyrinth tooth.

[0062] Refer to Figure 2, machining is carried out using the seal tooth machining tool designed by the method of this application. The symmetry line of the seal tooth tool is aligned with the symmetry line of the seal tooth, and only the feed in the diameter direction is carried out. The feed value each time is determined according to the material to be machined. When the cutting distance of the tool from the bottom diameter d of the seal tooth is still 0.1 mm (the allowance here can be adjusted according to the actual machining situation, and it is recommended not to be less than 0.1 mm), the tool is retracted; Step 3: Finish turning the seal teeth.

[0063] The seal tooth machining tool is used to machine the tooth side and arc of the seal tooth until the design value is reached.

[0064] During the finish machining process, the numerical control machining program is compiled according to the tooth profile data of the seal tooth, and the tooth side and arc of the seal tooth are machined in layers according to the numerical control machining program until the design value is reached.

[0065] The spindle speed is 28 m / min, the feed rate is 0.08 r / min, and the cutting depth is 0.15 mm.

[0066] For the seal tooth machining tool provided by this application, the length of the tool body is 1 mm greater than the height of the seal tooth, which significantly improves the overall rigidity of the tool, reduces machining vibration, and extends the tool life. The fillet of the cutting edge is consistent with the transition fillet of the seal tooth, avoiding over-cutting, reducing the force on the tool, preventing fracture or chipping, and solving the problem of insufficient strength of the existing tool by strengthening the tool structure; Secondly, the angle of the side of the tool body is greater than the maximum value of the tooth side angle, optimizing the chip removal path, reducing the cutting resistance, and further improving the durability of the tool.

[0067] The distance between the arc-shaped cutting edges is determined according to the straight-line length at the bottom of the groove of the seal tooth. When the length of the straight-line segment at the bottom of the tooth is less than 0.5 mm, a ball cutter structure without a straight-line structure is adopted to leave a suitable chip removal space. When the length of the straight-line segment at the bottom of the tooth is greater than 0.5 mm, the distance between the cutting edges is dynamically adjusted (m = M - 0.5) to ensure the strength of the tool itself.

[0068] For the seal tooth machining tool of this application, the distance between the cutting edges is directly related to the size of the straight-line segment at the bottom of the tooth, improving the strength of the tool itself while ensuring the chip removal space. The fillet of the cutting edge precisely matches the transition fillet of the seal tooth, reducing machining errors and ensuring that the machining dimensions meet the design requirements. The design of the angle of the side of the tool body improves the chip removal path, reduces the accumulation of cutting heat, reduces tool wear, and improves the surface finish. This tool design method significantly reduces the risk of tool fracture, extends the service life, and reduces the frequency of downtime for replacement through structural optimization (such as the length of the tool body and the fillet of the cutting edge). For different bottom tooth sizes, only the cutting edge parameters need to be adjusted, without changing the tool type, reducing the tool procurement and management costs. The tool design parameters are directly related to the geometric characteristics of the seal tooth, reducing the dependence on human experience and improving the consistency and reliability of the machining process.

[0069] Through structural optimization (rigidity improvement, chip evacuation improvement), parametric design (dynamic adaptation of the tooth bottom size), and geometric accuracy control (matching the characteristics of the sealing teeth), the tool systematically solves the problems of insufficient tool strength and poor versatility in the machining of small-sized sealing teeth, and has the advantages of high efficiency, durability, and economy.

[0070] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A small-size sealing tooth machining tool, characterized in that: It includes a blade body and a blade edge, the length of the blade body is greater than the sealing tooth height h, and the side angle of the blade body is greater than the tooth side angle C; The blade is an arc blade arranged at the lower end of the blade body, and the radius of the blade is the minimum value of the transition fillet R between the tooth side and the tooth bottom of the sealing tooth.

2. A small-size sealing tooth machining tool according to claim 1, characterized in that: The side angle of the blade body is the tooth side angle C+1 degree.

3. A small-size sealing tooth machining tool according to claim 1, characterized in that: The length of the straight line segment between the circular arcs of the blade is determined according to the bottom straight line segment M of the sealing tooth; When the length of the bottom straight line segment M of the sealing tooth is less than 0.5 mm, the blade is a spherical blade.

4. A small-size sealing tooth machining tool according to claim 3, characterized in that: When the length of the bottom straight line segment M of the sealing tooth is greater than 0.5 mm, the length m of the straight line segment between the arcs of the blade is M-0.5 mm.

5. A design method for a small-size sealing tooth machining tool, characterized in that: The process includes: Step 1, obtaining the tooth shape parameters of the sealing tooth; The tooth profile parameters include the sealing tooth height H, the transition fillet R between the tooth side and the tooth bottom of the sealing tooth, the tooth side angle C, and the straight line length M of the tooth bottom of the sealing tooth; Step 2: Design a sealing tooth machining tool according to the acquired tooth profile parameters; The length of the blade is determined according to the height H of the sealing teeth, and the length h of the blade is greater than the height H of the sealing teeth; The fillet angle r of the blade is determined according to the transition fillet angle R between the tooth side and the tooth bottom of the sealing tooth. The fillet angle r is equal to the transition fillet angle R between the tooth side and the tooth bottom of the sealing tooth. The blade side angle c of the tool is determined according to the tooth side angle C of the sealing tooth, and the blade side angle c is greater than the tooth side angle C by 1 degree; The length m of the straight line segment between the arc angles of the blade is determined according to the length M of the straight line segment at the bottom of the sealing tooth.

6. The design method of a small-size sealing tooth machining tool according to claim 5, characterized in that: In step 1, at least one of direct measurement, three-dimensional scanning, three-dimensional coordinate measuring machine and image measuring instrument is used to obtain the tooth shape parameters of the sealing tooth.

7. The design method of a small-size sealing tooth machining tool according to claim 6, characterized in that: The tooth profile parameters measured by various measurement methods are cross-validated to determine the final tooth profile parameters.

8. The design method of a small-size sealing tooth machining tool according to claim 5, characterized in that: Determine the length of the straight line segment m between the arc angles of the blade according to the length of the straight line segment M at the bottom of the sealing tooth. The method is as follows: When M is less than or equal to 0.5 mm, m is equal to 0 mm; When M is greater than 0.5 mm, m is equal to M-0.5 mm.

9. A method for processing a sealing tooth, characterized in that: The process includes: Step 1, turning the sealing tooth top diameter; Step 2: Rough turning the sealing teeth using the sealing teeth machining tool described in claim 1, the method is as follows: The symmetry line of the sealing tooth machining tool is aligned with the symmetry line of the sealing tooth groove, and radial feed cutting is performed until a predetermined size is reached; Step 3: Use a sealing tooth processing tool to process the tooth side and arc of the sealing tooth until the design value is reached.

10. A method for processing a sealing tooth according to claim 9, characterized in that: In step 3, a NC machining program is written according to the tooth shape data of the sealing tooth, and the tooth side and arc of the sealing tooth are layered processed according to the NC machining program until the design value is reached.

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