A processing method for a blade body and a rim plate transition part

Abstract

The present application relates to a blade processing method, in particular to a processing method for the transition part between a blade body and a rim plate, comprising the following steps: S1: measuring the excess of the blade root at the transition part between the blade body and the rim plate of the blade to be processed; S2: rough processing the transition part between the blade body and the rim plate by adopting numerical control milling and leaving excess; S3: processing the blade body, the rim plate and the transition part between the blade body and the rim plate by adopting numerical control grinding; S4: performing surface treatment on the blade body, the transition part between the blade body and the rim plate and the rim plate; in steps S2 and S3, the blade clamping device is used to clamp the blade to be processed, the first clamping station and the second clamping station are arranged on the blade clamping device; the blade root on the blade basin side of the blade to be processed clamped on the first clamping station faces upward; the blade root on the blade back side of the blade to be processed clamped on the second clamping station faces upward. The blade clamping device with the double clamping stations is used to clamp the blade to be processed, which greatly improves the processing efficiency.

Description

Technical Field

[0001] This invention relates to a blade processing method, and more particularly to a processing method for the junction of the blade and the ferrule. Background Technology

[0002] The machining quality of the blade root (the junction between the blade body and the shroud) is one of the key factors affecting the aerodynamic performance and fatigue resistance of aero-engines and gas turbines. The blade root is also a defect-prone area and a defect-sensitive region for titanium alloy blades. Many aero-engine failures are caused by component material fatigue and surface machining defects, while fatigue life is mainly affected by factors such as blade root stress concentration, blade body surface quality, and environmental corrosion. In aero-engine and gas turbine blades, whether fan blades, compressor blades, integral bladed disk blades, or integral bladed ring blades, the key technological challenge of efficiently and with high quality machining of the blade body-shroud junction in mass production remains unresolved.

[0003] Because the blade body and shroud have a certain angle and significant curvature variation, some blades are not tangential to the shroud, forming a variable-diameter arc surface. The blade blanks have poor flowability during forging and rolling, often resulting in a large amount of material to be removed at the junction of the blade body and shroud. For profiled forged blades, profiled rolled blades, profiled electrolytic blades, and profiled milled blades, the machining allowance for the blade body can currently be maintained between 0.3 and 0.8 mm, provided stable mass production is ensured. However, the machining allowance at the junction of the blade body and shroud ranges from 1 to 4 mm, and in some cases even exceeds 4 mm.

[0004] In existing technologies, CNC machining is mainly used to process the blade root. For example, patent application CN115971547A discloses a CNC machining method for the planar edge plate of a compressor blade. This method uses a tapered ball end mill to mill the root of the planar edge plate of the compressor blade, and utilizes the side edge of the tapered ball end mill to mill the straight edge plate of the planar edge plate. Using the side edge of the tapered ball end mill to mill the straight edge plate replaces the reciprocating milling of the ball end mill at the ball end. The original milling strategy of densely cutting and layering the ball end to create a flat surface is optimized to using the tapered ball end mill to mill the edge plate simultaneously with the blade profile and the root transition radius, thereby eliminating the edge plate milling step, shortening machining time, and increasing tool life.

[0005] However, although the prior art CN115971547A discloses the use of CNC milling to mill the blade root, it does not disclose how the blade is clamped. The fixture usually has only one clamping station. After milling the blade root on the blade basin side, the blade is flipped in one direction for clamping, and then the blade root on the blade back side is milled, resulting in slow processing efficiency. Summary of the Invention

[0006] The main objective of this invention is to provide a processing method for the junction of the blade and the ferrule, in order to solve the aforementioned technical problems.

[0007] To achieve the above objectives, the present invention proposes a processing method for the transition area between the blade and the ferrule, comprising the following steps:

[0008] S1: Measure the remaining amount of the blade root at the junction of the blade body and the edge plate of the blade to be processed;

[0009] S2: Roughly machine the junction between the blade and the rim plate using CNC milling, leaving a margin.

[0010] S3: The blade body, rim plate, and the junction between the blade body and rim plate are machined by CNC grinding.

[0011] S4: Perform surface treatment on the blade, the junction between the blade and the rim plate, and the rim plate;

[0012] In steps S2 and S3, a blade clamping device is used to clamp the blade to be processed. The blade clamping device is provided with a first clamping station and a second clamping station. The blade to be processed held at the first clamping station has its root on the leaf basin side facing upwards. The blade to be processed held at the second clamping station has its root on the leaf back side facing upwards.

[0013] Preferably, in step S1, the blades to be processed with different local allowances are grouped: the blades to be processed with allowances < 0.1 mm are divided into the first group, and the blades to be processed in the first group are directly processed in step S3; the blades to be processed with allowances of 0.1-0.3 mm are divided into the second group, and the blades to be processed with allowances > 0.3 mm are divided into the third group; in step S2, CNC milling programs are compiled for the blades to be processed in the second group and the third group respectively.

[0014] Preferably, step S3 specifically includes:

[0015] S31. Model Optimization: The theoretical model of the blade is optimized and adjusted using UG 3D model design software. The theoretical model of the blade is divided into segments, including the blade body, the leaf blade, and the blade root at the junction of the blade body and the leaf blade.

[0016] S32. Grinding: The machining program is programmed using interpolation programming, and CBN grinding wheels are used as cutting tools. The machining toolpath is generated based on the blade model optimized in step S31, and each area is machined using a zone grinding method.

[0017] Preferably, in step S4, the surface treatment sequence is as follows: first, laser strengthening treatment is performed, then shot peening is performed, then vibration finishing is performed, and finally an inorganic phosphate anti-corrosion coating is sprayed onto the leaf body.

[0018] Preferably, the blade clamping device includes a base plate, a first support, and a second support; a first inclined platform and a second inclined platform are integrally formed on the top surface of the base plate, the first support is installed on the top inclined surface of the first inclined platform; the second support is installed on the top inclined surface of the second inclined platform; a first mounting inclined surface is provided on the first support, and a second mounting inclined surface is provided on the second support; positioning blocks and tenon clamping components are respectively installed on the first mounting inclined surface and the second mounting inclined surface.

[0019] Preferably, the top slope of the first inclined platform is inclined with a lower front and a higher back, and the inclination angle is A; the top slope of the second inclined platform is inclined with a higher front and a lower back, and the inclination angle is B; satisfying: A=A1, B=B1; where: A1 is the design angle between the transverse section of the blade body to be processed and the basin-side edge plate surface; B1 is the design angle between the transverse section of the blade body to be processed and the back-side edge plate surface.

[0020] Preferably, the first mounting inclined surface is inclined from left to right with an angle of E; the second mounting inclined surface is inclined from left to right with an angle of F; satisfying: E=90°-α, F=90°-β; where: α is the angle formed by the chord line of the transverse section of the blade root on the blade basin side of the blade to be processed and the engine axis; β is the angle formed by the chord line of the transverse section of the blade root on the back side of the blade to be processed and the engine axis.

[0021] Preferably, a positioning protrusion is provided on the right end face of the positioning block; the positioning protrusion is used to abut against the side plane of the blade to be processed.

[0022] Preferably, locking grooves are provided at the left and right ends of the base plate, and the locking grooves are U-shaped opening grooves.

[0023] Preferably, the tenon clamping assembly includes a lower clamping plate and an upper clamping plate; the lower clamping plate and the upper clamping plate are connected by locking screws; an upper clamping claw is integrally formed on the rear end face of the upper clamping plate, and a lower clamping claw is integrally formed on the rear end face of the lower clamping plate; a mortise is provided between the upper clamping claw and the lower clamping claw for clamping the tenon of the blade to be processed.

[0024] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0025] (1) By adopting the processing method provided by the present invention, when performing CNC milling and CNC grinding, a blade clamping device with dual clamping stations is used to clamp the blade to be processed. When the blade at one clamping station is being processed, the blade at the other clamping station can be clamped, which greatly improves the processing efficiency.

[0026] (3) In this invention, the blade clamping device employs a blade with the blade root on the leaf basin side facing upwards, while the blade root on the back side facing upwards, held at the first clamping station. After the blade root on the leaf basin side of the blade at the first clamping station is processed, the blade is removed and placed into the second clamping station for processing of the blade root on the back side. The first clamping station is used to process the blade root on the leaf basin side, and the second clamping station is used to process the blade root on the leaf basin side, which simplifies the processing procedure and improves processing efficiency. In addition, specifying a clamping direction from the upper right to the lower left effectively reduces the risk of clamping or crushing damage to the blade tenon working surface.

[0027] (3) By adopting the processing method provided by this invention, after removing the large amount of material at the junction of the blade body and the shroud, the allowance between the blade body, the shroud, and the junction is consistent with the finished blade size. Then, CNC grinding is used for processing, significantly improving processing efficiency. This invention provides a new method that completely solves the problems of tool marks caused by changing different specifications of tools when processing different parts of the blade using traditional five-axis machining centers, or the low processing efficiency caused by using a single specification of tool to avoid tool marks. This invention adopts the method of "rough machining of the blade root → CNC grinding of the blade body and shroud root → surface treatment," completely replacing the traditional method of "four-axis rough milling of the blade body and shroud root → five-axis finish milling of the blade body and shroud root → rough polishing of the blade body and shroud root → stress-relieving annealing → corrosion inspection → finish polishing of the blade body and shroud root," significantly shortening the process route and making it more suitable for the construction of automated production lines for blades. This is very important and more adaptable to future development trends.

[0028] (4) In the blade clamping device used in this invention, by utilizing the angle design of the first inclined table, the second inclined table, the first mounting inclined surface, and the second mounting inclined surface, the blade root on the blade basin side of the blade to be processed held at the first clamping station faces upward, and the blade root on the back side of the blade to be processed held at the second clamping station faces upward. When performing CNC milling and grinding, the processing tool does not need to be deflected at a large angle to perform processing, which is beneficial to simplifying the processing procedure. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a flowchart illustrating the processing method for the junction between the blade and the fin plate provided by the present invention.

[0031] Figure 2This is a schematic diagram showing two blades to be processed clamped behind a blade clamping device.

[0032] Figure 3 This is a schematic diagram of the base plate.

[0033] Figure 4 This is a schematic diagram of the tenon clamping assembly.

[0034] Figure 5 This is a schematic diagram of the first support structure.

[0035] Figure 6 This is a schematic diagram of the second support structure.

[0036] Figure 7 This is a schematic diagram of the positioning stop.

[0037] Figure 8 This is a schematic diagram of the design angle A1 between the transverse cross section of the blade to be processed and the surface of the basin-side edge plate.

[0038] Figure 9 This is a schematic diagram of the design angle B1 between the transverse cross section of the blade body to be processed and the back edge plate surface.

[0039] Figure 10 This is a schematic diagram showing the angle α formed by the chord line of the transverse section of the blade root on the blade basin side of the blade to be processed and the engine axis.

[0040] Figure 11 This is a schematic diagram showing the angle β formed by the chord line of the transverse section of the blade root on the back side of the blade to be processed and the engine axis.

[0041] Figure 12 Comparison of blade roughing before and after.

[0042] Explanation of reference numerals: 1. Base plate; 1a. First inclined platform; 1b. Second inclined platform; 1c. Locking groove; 2. Upper clamping plate; 2a. Upper clamping claw; 3. Lower clamping plate; 3a. Lower clamping claw; 4. Mortise and tenon groove; 5. First support; 5a. First mounting inclined surface; 6. Second support; 6a. Second mounting inclined surface; 7. Positioning stop; 7a. Positioning protrusion; 9. Tenon clamping assembly; 10. Locking screw; 100. First clamping station; 200. Second clamping station. Detailed Implementation

[0043] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0045] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0046] Referring to the attached figures, a processing method for the junction of the blade and the ferrule includes the following steps:

[0047] S1: Measure the remaining amount of the blade root at the junction of the blade body and the edge plate of the blade to be processed;

[0048] S2: Roughly machine the junction between the blade and the rim plate using CNC milling, leaving a margin.

[0049] S3: The blade body, rim plate, and the junction between the blade body and rim plate are machined by CNC grinding.

[0050] S4: Perform surface treatment on the blade, the junction between the blade and the rim plate, and the rim plate;

[0051] In steps S2 and S3, a blade clamping device is used to clamp the blade to be processed. The blade clamping device is provided with a first clamping station 100 and a second clamping station 200. The blade to be processed clamped at the first clamping station 100 has its leaf root on the leaf basin side facing upwards. The blade to be processed clamped at the second clamping station 200 has its leaf root on the leaf back side facing upwards.

[0052] In step S1, the blades to be processed are grouped according to different local allowances:

[0053] The blades with a allowance of <0.1mm are divided into the first group, and the blades in the first group are directly processed in step S3. This group has a relatively small allowance and can be directly subjected to CNC grinding.

[0054] The blades to be machined with a allowance of 0.1-0.3mm are divided into a second group, and the blades to be machined with a allowance > 0.3mm are divided into a third group. In step S2, CNC milling programs are programmed for the second and third groups of blades to be machined respectively. By adopting group programming, different machining programs are selected according to different allowance thicknesses, avoiding the impact of different allowances on tool life and effectively reducing product scrap.

[0055] Step S3 specifically includes:

[0056] S31. Model Optimization: The theoretical model of the blade is optimized and adjusted using UG 3D model design software. The theoretical model of the blade is divided into segments, including the blade body, the leaf blade, and the blade root at the junction of the blade body and the leaf blade.

[0057] S32. Grinding: The machining program is programmed using interpolation programming, and CBN grinding wheels are used as cutting tools. The machining toolpath is generated based on the blade model optimized in step S31, and each area is machined using a zone grinding method.

[0058] In step S4, the surface treatment sequence is as follows: first, laser strengthening treatment is performed, then shot peening is performed, then vibration finishing is performed to improve surface smoothness, and finally an inorganic phosphate anti-corrosion coating is sprayed on the blade to improve the blade's resistance to erosion and corrosion.

[0059] In this embodiment, the blade clamping device includes a base plate 1, a first support 5, and a second support 6. A first inclined platform 1a and a second inclined platform 1b are integrally formed on the top surface of the base plate 1. The first support 5 is installed on the top inclined surface of the first inclined platform 1a. The second support 6 is installed on the top inclined surface of the second inclined platform 1b. A first mounting inclined surface 5a is provided on the first support 5, and a second mounting inclined surface 6a is provided on the second support 6. A positioning block 7 and a tenon clamping assembly 9 are respectively installed on the first mounting inclined surface 5a and the second mounting inclined surface 6a.

[0060] Combination Figure 2 As shown, the first support 5 and the positioning block 7 and tenon clamping assembly 9 on its first mounting inclined surface 5a together form the first clamping station 100, where a blade N1 to be processed is clamped, with the blade root on the blade base side facing upwards. The second support 6 and the positioning block 7 and tenon clamping assembly 9 on its second mounting inclined surface 6a together form the second clamping station 200, where a blade N2 to be processed is clamped, with the blade root on the blade back side facing upwards.

[0061] Combination Figure 1 , Figure 8 and Figure 9As shown, the top slope of the first inclined platform 1a is inclined at a lower front and higher back, with an inclination angle of A; the top slope of the second inclined platform 1b is inclined at a higher front and lower back, with an inclination angle of B; satisfying: A=A1, B=B1. Where: A1 is the design angle between the transverse section of the blade body to be processed and the surface of the blade's back edge; B1 is the design angle between the transverse section of the blade body to be processed and the surface of the blade's back edge. The transverse section refers to the section perpendicular to the blade's Z-axis, and angles A1 and B1 are design parameters given during blade design. On most blades, angles A1 and B1 are equal, i.e., A1=B1, and angles A1 and B1 are generally taken as 0° to 20°. However, there are also blades where the two angles are not equal. The purpose of setting the first inclined platform 1a and the second inclined platform 1b is to align the blade root for easier processing.

[0062] Combination Figure 5 , Figure 6 as well as Figure 10 , Figure 11 As shown, the first mounting inclined surface 5a is inclined from left to right, with an angle of inclination E relative to the bottom surface of the first support 5; the second mounting inclined surface 6a is inclined from left to right, with an angle of inclination F relative to the bottom surface of the second support 6; satisfying: E=90°-α, F=90°-β; where: α is the angle formed by the chord line of the transverse section of the blade root on the blade head side of the blade to be processed and the engine axis; β is the angle formed by the chord line of the transverse section of the blade root on the blade back side of the blade to be processed and the engine axis. α and β are design parameters given during blade design. The purpose of designing the angles of the first mounting inclined surface 5a and the second mounting inclined surface 6a is to further align the blade root for easier processing.

[0063] Combination Figure 7 As shown, a positioning protrusion 7a is provided on the right end face of the positioning block 7; the positioning protrusion 7a is used to abut against the side plane of the blade to be processed. The positioning block 7 is installed on the first support 5 and the second support 6 by screws and positioning pins, and the positioning protrusion 7a on the positioning block 7 is used as a positioning reference.

[0064] Combination Figure 3 As shown, locking grooves 1c are respectively provided at the left and right ends of the base plate 1. The locking grooves 1c are U-shaped opening grooves. The base plate 1 is connected to the worktable of the processing machine tool by bolts through the locking grooves 1c.

[0065] Combination Figure 4As shown, the tenon clamping assembly 9 includes a lower clamping plate 3 and an upper clamping plate 2; the lower clamping plate 3 and the upper clamping plate 2 are connected by locking screws 10; the lower clamping plate 3 is fastened to the first mounting inclined surface 5a of the first support 5 by positioning pins and screws, and is fastened to the second mounting inclined surface 6a of the second support 6 by positioning pins and screws. An upper clamping claw 2a is integrally formed on the rear end face of the upper clamping plate 2, and a lower clamping claw 3a is integrally formed on the rear end face of the lower clamping plate 3; a mortise 4 is provided between the upper clamping claw 2a and the lower clamping claw 3a for clamping the tenon of the blade to be processed.

[0066] Step S2 specifically includes:

[0067] S21. A three-axis CNC horizontal milling machine is used to fix the blade clamping device on the machine tool's worktable via locking groove 1c.

[0068] S22. Loosen the locking screw 10 on the tenon clamping assembly 9, using the positioning block 7 on the first support 5 as a positioning support, as follows: Figure 4 As shown, the tenon of the blade to be processed is inserted from the upper angle to the lower angle into the mortise 4 on the tenon clamping assembly 9 corresponding to the first clamping station 100 and locked. Similarly, using the positioning block 7 on the second support 6 as a positioning support, the tenon of the blade to be processed is inserted from the upper angle to the lower angle into the mortise 4 on the tenon clamping assembly 9 corresponding to the second clamping station 200 and locked, thus completing the blade clamping.

[0069] S23. According to the processing procedure, complete the rough machining of the blade to be processed from the base to the root on the first clamping station 100, and complete the rough machining of the blade to be processed from the back to the root on the second clamping station 200.

[0070] S24. Swap the positions of the blades on the first clamping station 100 and the second clamping station 200, and repeat steps S22 and S23.

[0071] In addition, while the blades at one clamping station are being processed, the blades at the other clamping station can be clamped, which greatly improves processing efficiency.

[0072] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for processing the junction between the blade and the ferrule, characterized in that, Includes the following steps: S1: Measure the remaining amount of the blade root at the junction of the blade body and the edge plate of the blade to be processed; S2: Roughly machine the junction between the blade and the rim plate using CNC milling, leaving a margin. S3: The blade body, rim plate, and the junction between the blade body and rim plate are machined by CNC grinding. S4: Perform surface treatment on the blade, the junction between the blade and the rim plate, and the rim plate; In steps S2 and S3, a blade clamping device is used to clamp the blade to be processed. The blade clamping device is provided with a first clamping station (100) and a second clamping station (200). The leaf root of the blade to be processed held on the leaf basin side of the first clamping station (100) faces upward; The blade to be processed held at the second clamping station (200) has its root facing upwards on the back side of the blade. In step S1, the blades to be processed are grouped according to different local allowances: The blades to be processed with a margin of <0.1mm are divided into the first group, and the blades to be processed in the first group are directly processed in step S3. The blades to be processed with a margin of 0.1-0.3mm are divided into the second group, and the blades to be processed with a margin of >0.3mm are divided into the third group. In step S2, CNC milling programs are compiled for the second and third groups of blades to be processed respectively; The blade clamping device includes a base plate (1), a first support (5), and a second support (6); A first inclined platform (1a) and a second inclined platform (1b) are integrally formed on the top surface of the base plate (1). The first support (5) is installed on the top inclined surface of the first inclined platform (1a); The second support (6) is installed on the top inclined surface of the second inclined platform (1b); A first mounting slope (5a) is provided on the first support (5), and a second mounting slope (6a) is provided on the second support (6). Positioning blocks (7) and tenon clamping components (9) are respectively installed on the first mounting inclined surface (5a) and the second mounting inclined surface (6a); The tenon clamping assembly (9) includes a lower clamping plate (3) and an upper clamping plate (2); The lower clamping plate (3) and the upper clamping plate (2) are connected by locking screws (10); An upper clamping claw (2a) is integrally formed on the rear end face of the upper clamping plate (2), and a lower clamping claw (3a) is integrally formed on the rear end face of the lower clamping plate (3). A tenon groove (4) is provided between the upper jaw (2a) and the lower jaw (3a) for clamping the tenon of the blade to be processed.

2. The processing method for the transition area between the blade and the fin plate according to claim 1, characterized in that, Step S3 specifically includes: S31. Model Optimization: The theoretical model of the blade is optimized and adjusted using UG 3D model design software. The theoretical model of the blade is divided into segments, including the blade body, the leaf blade, and the blade root at the junction of the blade body and the leaf blade. S32. Grinding: The machining program is programmed using interpolation programming, and CBN grinding wheels are used as cutting tools. The machining toolpath is generated based on the blade model optimized in step S31, and each area is machined using a zone grinding method.

3. The processing method for the transition area between the blade and the ferrule according to claim 1, characterized in that, In step S4, the surface treatment sequence is as follows: first, laser strengthening treatment is performed, then shot peening is performed, then vibration finishing is performed, and finally an inorganic phosphate anti-corrosion coating is sprayed onto the blade.

4. The processing method for the transition area between the blade and the fin plate according to claim 1, characterized in that, The top slope of the first inclined platform (1a) is inclined in a way that is lower in the front and higher in the back, and the inclination angle is A; The top slope of the second inclined platform (1b) is inclined in a way that is higher in the front and lower in the back, and the inclination angle is B. Satisfying: A=A1, B=B1; Where: A1 is the design angle between the transverse cross section of the blade body to be processed and the surface of the basin flange; B1 is the design angle between the transverse cross section of the blade body to be processed and the back edge plate surface.

5. A processing method for the transition area between the blade and the ferrule according to claim 1, characterized in that, The first mounting ramp (5a) is inclined on the left and on the right, and the inclination angle is E; The second mounting ramp (6a) is inclined on the left and on the right, and the inclination angle is F; Satisfying: E ​​= 90° - α, F = 90° - β; where: α is the angle formed by the chord of the transverse section of the blade root on the blade facet side of the blade to be processed and the engine axis. β is the angle formed by the chord of the transverse section of the blade root on the back side of the blade to be processed and the engine axis.

6. A processing method for the transition area between the blade and the fin plate according to claim 1, characterized in that, A positioning protrusion (7a) is provided on the right end face of the positioning block (7); the positioning protrusion (7a) is used to abut against the side plane of the blade to be processed.

7. A processing method for the transition area between the blade and the ferrule according to claim 1, characterized in that, Locking grooves (1c) are respectively provided at the left and right ends of the base plate (1), and the locking grooves (1c) are U-shaped opening grooves.

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