Variable cross-section blade remanufacturing repair model acquisition method and blade detection tool

Abstract

The application relates to the technical field of aero-engine blade repair, and particularly discloses a variable cross-section blade remanufacturing repair model acquisition method and a blade detection tool, which comprises the following steps: S1, collecting point cloud data of different variable cross-section blade new parts, and establishing a variable cross-section blade point cloud model; S2, acquiring a reference grid model in a weighted average manner according to the point cloud model in S1; and S3, reconstructing the reference grid model in S2 to obtain a variable cross-section blade remanufacturing repair model. The method can improve the precision of the variable cross-section blade remanufacturing repair model, and a blade detection tool can be designed and manufactured based on the obtained remanufacturing repair model, so that the blade type and size data of the variable cross-section blade can be detected during the repair process, the blade repair quality is improved, and the repaired blade can meet the aerodynamic requirements of the engine blade type.

Description

Technical Field

[0001] This invention relates to the field of aero-engine blade repair technology, specifically to a method for obtaining a remanufacturing and repair model of a variable cross-section blade and a tooling for detecting variable cross-section blades. Background Technology

[0002] A certain type of aero-engine with variable cross-section blades, such as Figure 1 As shown, during operation, blades are frequently impacted by foreign objects in the compressed air, resulting in numerous corrosion pits on the blade body. Corrosion also causes a reduction in chord length and leading edge thickness on the inlet and exhaust sides. Due to the complex manufacturing process and long production cycle of blades, directly replacing old blades with new ones incurs high costs. Generally speaking, the average cost of blade repair is only 20%-30% of the cost of replacing new blades.

[0003] Existing repair technologies: Patent CN119571316A discloses a blade repair method and system, which can repair blade height but cannot repair blade corrosion, blade profile, or chord length, nor does it provide a method for blade measurement. Patent CN103630034A discloses a universal combination measuring tool and method for measuring axial blades, which can measure the mounting angle, profile, and tip height of axial blades after installation, but cannot detect the profile and height of individual damaged blades. Patent CN114543731A discloses a blade inspection method and device for measuring the cross-sectional data of new parts, but cannot inspect damaged blades repaired after service.

[0004] Due to inherent manufacturing errors in the blades themselves, and the deformation that occurs during operation, directly referring to the theoretical blade model during additive remanufacturing repair of the blade body, inlet edge, and exhaust edge will result in the repaired blade's shape and dimensions not meeting requirements. Therefore, it is necessary to accurately calculate the standard model for the modified cross-section blade during additive remanufacturing repair. Additionally, a set of testing fixtures is required during the repair process to detect data such as the profile, blade height, and chord length, ensuring that the repaired modified cross-section blade meets the aerodynamic requirements of the engine blade profile. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the remanufacturing and repair process of variable cross-section blades by providing a method for obtaining a remanufacturing and repair model of variable cross-section blades and a blade inspection fixture. This method can improve the accuracy of the remanufacturing and repair model of variable cross-section blades, thereby improving the quality of blade repair. Furthermore, based on the remanufacturing and repair model, a blade inspection fixture is designed and manufactured to detect the blade profile, leading and trailing edge dimensions, and other data of the variable cross-section blade during the repair process.

[0006] This invention is achieved through the following technical solution:

[0007] In a first aspect, the present application provides a method for obtaining a remanufacturing repair model of a variable cross-section blade, comprising the following steps:

[0008] S1, collecting point cloud data of different variable cross-section blade new parts, and establishing a variable cross-section blade point cloud model;

[0009] S2, obtaining a reference grid model in a weighted average manner according to the point cloud model in S1;

[0010] S3, reconstructing the reference grid model in S2 to obtain a remanufacturing repair model of the variable cross-section blade.

[0011] As a solution of the present application, step S2 comprises the following steps:

[0012] S21, calculating an average point;

[0013] S22, calculating a weighted average point;

[0014] S23, calculating other points on the grid in the same way as in S21 and S22 to obtain a reference grid;

[0015] S24, calculating all grids in the facet body in steps S21-S23 to obtain a reference grid model.

[0016] As a solution of the present application, step S21 specifically comprises: selecting three grids, taking one grid as a calculation reference, selecting a point i on the grid as a reference point, calculating the deviation dij of the point i from each grid, then calculating the average deviation dAVGi to obtain the average point AVGi.

[0017] As a solution of the present application, step S22 specifically comprises: calculating the deviation devij of each grid from the average point AVGi, then calculating the average deviation avg_dev, weighting devij with the average deviation avg_dev to obtain the weighted point dev'ij, if devij is greater than avg_dev, then dev'ij is equal to avg_dev, otherwise dev'ij is equal to devij, and finally calculating the average value of the weighted point dev'ij, that is, the distance dev of the average point AVGi to the weighted average point AVGi', to obtain the weighted average point AVGi'.

[0018] In a second aspect, the present application provides a variable cross-section vane detection tool, comprising a profile detection tool, the profile detection tool comprising a positioning and clamping assembly arranged on a first base plate, a plurality of outer cambered surface templates, and a plurality of inner cambered surface templates; the positioning and clamping assembly is used to mount a positioning stator vane during detection; the plurality of outer cambered surface templates and the plurality of inner cambered surface templates are processed based on the remanufacturing repair model described above, and the plurality of outer cambered surface templates and the plurality of inner cambered surface templates are movably sleeved on two mandrels on the first base plate, and the axial distribution positions of the plurality of outer cambered surface templates and the plurality of inner cambered surface templates on the mandrels correspond to the positions of the vane profiles of the stator vane.

[0019] According to one scheme of the present application, the plurality of outer cambered surface templates are processed according to the profile back appearance data of each vane profile section of the remanufacturing repair model, and the plurality of inner cambered surface templates are processed according to the profile basin appearance data of each vane profile section of the remanufacturing repair model.

[0020] According to one scheme of the present application, the variable cross-section vane detection tool further comprises a size detection tool, the size detection tool comprising a positioning and clamping assembly arranged on a second base plate and a detection assembly; the positioning and clamping assembly is used to mount a positioning stator vane during detection; the detection assembly has two detection assemblies arranged at right angles on the second base plate, and the detection assembly comprises a support and a measurement block connected to the support, the height of the measurement block from the second base plate is adjustable, and the horizontal distance of the measurement block from the stator vane is adjustable.

[0021] According to one scheme of the present application, the support is provided with a plurality of limiting holes spaced apart in the height direction, and the vertical distribution positions of the limiting holes correspond to the positions of the vane profiles of the stator vane; a vertical sliding column is further arranged on the support, a rotation-preventing sliding block is arranged on the vertical sliding column, a horizontal sliding column and a limiting pin are arranged on the rotation-preventing sliding block, one end of the horizontal sliding column facing the stator vane is connected to the measurement block, and the limiting pin can be inserted into the limiting hole.

[0022] According to one scheme of the present application, the positioning and clamping assembly comprises a base and a sliding block, the base has a fixed clamping block, the sliding block is slidably arranged in the base, the sliding block has a mounting hole, the fixed clamping block extends into the mounting hole, a V-shaped groove is formed on one side of the fixed clamping block and the mounting hole in the sliding direction of the sliding block, and a limiting block is slidably arranged in the mounting hole, and the sliding direction of the limiting block is the same as that of the sliding block.

[0023] According to one scheme of the present application, a connecting rod is arranged on the side of the sliding block opposite to the V-shaped groove, a pressing block is arranged on the base, the connecting rod penetrates through the pressing block and is matched with a knurled nut; a first guide rod and a first spring are arranged between the sliding block and the base in the sliding direction, and a second guide rod and a second spring are arranged between the limiting block and the sliding block in the sliding direction.

[0024] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0025] The present application can improve the precision of the remanufacturing repair model of the variable cross-section blade, and can improve the blade repair quality and ensure that the repaired blade meets the engine blade aerodynamic requirements by detecting the blade type, size data and the like of the variable cross-section blade during the repair process based on the obtained remanufacturing repair model to design and manufacture a blade detection tool. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0027] Figure 1 FIG. 1 is a schematic diagram of a variable cross-section blade of a certain type of aero-engine;

[0028] Figure 2 FIG. 2 is a schematic diagram of a variable cross-section blade point cloud model established in the present application;

[0029] Figure 3 FIG. 3 is an enlarged schematic diagram of a small plane body of the point cloud model in the present application;

[0030] Figure 4 FIG. 4 is a schematic diagram of deviation of different small plane bodies of the same product in the present application;

[0031] Figure 5 FIG. 5 is a schematic diagram of an average grid model in the present application;

[0032] Figure 6 FIG. 6 is a schematic diagram of average point calculation in the present application;

[0033] Figure 7 FIG. 7 is a schematic diagram of grid and average point deviation calculation in the present application;

[0034] Figure 8 FIG. 8 is a schematic diagram of weighted average points in the present application;

[0035] Figure 9 FIG. 9 is a flow chart of a variable cross-section blade remanufacturing repair model acquisition method in the present application;

[0036] Figure 10The schematic diagram of the profile detection tool in the application;

[0037] Figure 11 The schematic diagram of the size detection tool in the application;

[0038] Figure 12 The schematic diagram of the detection assembly in the size detection tool in the application;

[0039] Figure 13 The schematic diagram of the positioning and clamping assembly in the application;

[0040] Figure 14 The schematic diagram of the positioning and clamping assembly in the application;

[0041] Figure 15 The schematic diagram of the base in the positioning and clamping assembly in the application;

[0042] Figure 16 The schematic diagram of the slider in the positioning and clamping assembly in the application.

[0043] Markings in the drawings and corresponding names of parts:

[0044] 11-first bottom plate, 12-outer arc surface template, 13-inner arc surface template, 14-core shaft; 21-second bottom plate, 211-reference block, 22-stand, 221-limiting hole, 23-measuring block, 24-vertical slide column, 25-anti-rotation slider, 26-horizontal slide column, 261-handle, 27-limiting pin, 28-compression spring; 3-positioning and clamping assembly, 31-base, 311-fixed clamping block, 312-pressing block, 32-slider, 321-linkage, 322-knob nut, 33-V-shaped groove, 34-limiting block, 35-first guide rod, 351-first spring, 36-second guide rod, 361-second spring; 4-stator blade. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the application more clear and obvious, the technical scheme of the application will be further described in detail below in combination with embodiments and drawings, and the illustrative embodiments of the application and the description thereof are only used to explain the application, and are not intended to limit the application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the application; the terms "include" and "have" and any variations thereof in the specification and claims of the application and the above description of drawings are intended to cover non-exclusive inclusion.

[0047] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in one embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As will be understood by those skilled in the art, embodiments described herein can be combined with other embodiments.

[0048] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width, and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0049] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms“mounting”,“connection”,“connecting”,“fixing”, and other terms should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] Please refer to Figures 2 to 9 The method for obtaining a variable cross-section blade remanufacturing repair model provided in the embodiments of the present application includes the following steps:

[0051] S1, collecting point cloud data of different variable cross-section blade new parts, establishing a variable cross-section blade point cloud model; Figure 2 as shown in the variable cross-section blade point cloud model;

[0052] S2, obtaining a reference grid model in a weighted average manner according to the point cloud model in S1;

[0053] S3, reconstructing the reference grid model in S2 to obtain a variable cross-section blade remanufacturing repair model.

[0054] Since a certain facet body of the established variable cross-section blade point cloud model is spliced by a large number of small grids, as shown in Figure 3 each facet body is a product, and due to machining and measurement errors, the position of the facet body will deviate from the design reference, and when enlarged, it is the deviation between small grids, as shown in Figure 4The deviation distribution generally conforms to a normal distribution according to the law of measurement error and manufacturing error, that is, the average value is close to the design value. Therefore, the average value is used to calculate a plurality of small grid positions, the grid positions close to the design value are obtained, the reference grid is determined, and all reference grids are combined into a facet body to form the best reference grid model.

[0055] According to some embodiments of the present application, step S2 comprises the following steps:

[0056] S21, calculating an average point:

[0057] Since each grid is composed of a plurality of points, the average value of the corresponding points of each product corresponding grid is calculated, and then an average grid model is formed. For example, as shown in Figure 5 , three grids (grid 1, grid 2, and grid 3) are selected, grid 1 is selected as a calculation reference, a point i on grid 1 is selected as a reference point for calculation, the deviation dij (di1, di2, di3) of point i from each grid is calculated, and then the average deviation dAVGi (dAVGi = sum (dij) / Nm, where Nm is 3 in this example) is calculated. The average point AVGi is as shown in Figure 6 .

[0058] S22, calculating a weighted average point:

[0059] The deviation devij of each grid from the average point AVGi is calculated, as shown in Figure 7 ; then the average deviation avg_dev (avg_dev = sum(devij) / Nm) is calculated. For weighting, the contribution rate of all grids is limited by the average deviation avg_dev, and the software replaces those points outside this limit with the average deviation avg_dev, that is, if devij > avg_dev, then dev'ij = avg_dev, otherwise dev'ij = devij; finally, the distance dev (dev = sum(dev'ij) / Nm) between the average point AVGi and the weighted average point AVGi' is calculated, thereby obtaining the weighted average point AVGi', as shown in Figure 8 . It should be noted that the difference calculation results involved in the above steps are all absolute values.

[0060] S23, calculating the reference grid by using the same method as in S21 and S22 for other points on the grid;

[0061] S24, calculating the reference grid model by using steps S21-S23 for all grids in the facet body.

[0062] The application can establish a variable cross-section blade point cloud model from the variable cross-section blade new point cloud data of the blue light scanning, acquire a reference grid model in a weighted average manner according to the established point cloud model, and then reconstruct the reference grid model to obtain a remanufacturing repair model of the variable cross-section blade, so as to improve the precision of the remanufacturing repair model of the variable cross-section blade, and further improve the blade repair quality and ensure that the repaired blade meets the aerodynamic requirements of the engine blade profile.

[0063] Please refer to Figures 10 to 16 In the embodiment of the application, a variable cross-section blade detection tool is provided, which comprises a profile detection tool, the profile detection tool comprising a positioning and clamping assembly 3 arranged on a first bottom plate 11, a plurality of outer arc surface templates 12 and a plurality of inner arc surface templates 13; the positioning and clamping assembly 3 is used for installing and positioning the stator blade 4 during detection; the plurality of outer arc surface templates 12 and the plurality of inner arc surface templates 13 are processed based on the remanufacturing repair model described above, and the plurality of outer arc surface templates 12 and the plurality of inner arc surface templates 13 are movably sleeved on two core shafts 14 arranged on the first bottom plate 11, and the axial distribution positions of the plurality of outer arc surface templates 12 and the plurality of inner arc surface templates 13 on the core shafts 14 correspond to the positions of the blade profile cross sections of the stator blade 4.

[0064] According to some embodiments of the application, the plurality of outer arc surface templates 12 are processed according to the blade back appearance data of the blade profile cross sections of the remanufacturing repair model, and the plurality of inner arc surface templates 13 are processed according to the blade basin appearance data of the blade profile cross sections of the remanufacturing repair model. The outer arc surface templates 12 and the inner arc surface templates 13 are made of materials with good corrosion resistance and wear resistance, have a hardness of 48-53HRC, and are subjected to bluing treatment to enhance the surface and ensure the accuracy of the blade profile contrast.

[0065] Since the stator blade 4 has seven blade profile cross sections, the outer arc surface templates 12 and the inner arc surface templates 13 are also seven. The seven outer arc surface templates 12 and the seven inner arc surface templates 13 are sleeved on the core shafts 14, respectively, and the templates on each core shaft 14 are spaced apart by the spacer blocks sleeved on the core shaft 14, so that the axial distribution positions of the templates correspond to the positions of the blade profile cross sections of the stator blade 4.

[0066] The specific use of the profile detection tool is as follows: the stator blade 4 is clamped on the profile detection tool, the positioning and clamping assembly 3 is used to position and clamp the stator blade 4, the seven blade profile cross sections of the stator blade 4 are compared with the plurality of outer arc surface templates 12 and the plurality of inner arc surface templates 13, respectively, and the accuracy of the blade profile modification is determined by the fitting degree of the blade basin (inner arc surface) and the blade back (outer arc surface) of the stator blade 4 with the templates. The blade profile qualification standard is that the blade basin and the blade back are in close contact with the inner arc surface templates 13 and the outer arc surface templates 12. If they are not in close contact, they can be gradually polished to eliminate the high points to make them close to each other until they are in close contact.

[0067] According to some embodiments of the present application, the variable cross-section blade detection tool further comprises a size detection tool, the size detection tool comprising a positioning and clamping assembly 3 and a detection assembly arranged on the second bottom plate 21; the positioning and clamping assembly 3 is used to install the positioning stator blade 4 during detection; the detection assembly has two and is arranged at right angles on the second bottom plate 21, the detection assembly comprising a support 22 and a measuring block 23 connected to the support 22, the height of the measuring block 23 from the second bottom plate 21 being adjustable, and the horizontal distance of the measuring block 23 from the stator blade 4 being adjustable.

[0068] According to some embodiments of the present application, the support 22 is provided with a plurality of limiting holes 221 arranged at intervals in the height direction, and the vertical distribution position of each limiting hole 221 corresponds to the position of each blade cross-section of the stator blade 4; the support 22 is further provided with a vertical sliding column 24, the vertical sliding column 24 is provided with a rotation-preventing sliding block 25 matched thereon, the rotation-preventing sliding block 25 is provided with a horizontal sliding column 26 and a limiting pin 27 matched thereon, one end of the horizontal sliding column 26 towards the stator blade 4 is connected to the measuring block 23, and the limiting pin 27 can be inserted into the limiting hole 221.

[0069] Since the stator blade 4 has seven blade cross-sections, the support 22 is provided with limiting holes 221 of seven heights. During measurement, the rotation-preventing sliding block 25 is moved up and down along the vertical sliding column 24, so that the limiting pin 27 is inserted into the limiting hole 221 at a certain height position, so that the measuring block 23 can measure a certain blade cross-section of the stator blade 4. The other end of the horizontal sliding column 26 is threadedly connected with a handle 261, and the end of the horizontal sliding column 26 close to the measuring block 23 is further provided with a compression spring 28. The horizontal sliding column 26 can be moved by the handle 261, and since the horizontal sliding column 26 is provided with a flat position in the axial direction, it will not rotate during movement.

[0070] The second bottom plate 21 is further provided with two reference blocks 211, and the relative distance between the measuring block 23 and the reference block 211 can be measured by the upper long-jawed tape gauge during measurement, so that 28 size data of the seven blade cross-sections of the variable cross-section blade can be obtained, and the chord length of each cross-section can be obtained by the upper long-jawed tape gauge, so that a total of 35 size data can be obtained.

[0071] The specific use of the size detection tool is as follows: the stator blade 4 is clamped on the size detection tool, and the positioning and clamping assembly 3 is used to position and clamp the stator blade 4. By adjusting the measuring block 23 at different cross-sectional heights, and combining the upper long claw with the dial caliper, the size of the blade inlet edge, the blade outlet edge to the stacking shaft at the cross section can be detected, and the size standard of the stacking shaft at the cross section (which can be obtained from the remanufacturing and repairing model described above) needs to be met. If the size of the stacking shaft exceeds the specified size, the inlet edge and the outlet edge are ground until the size meets the standard. If the size of the stacking shaft is insufficient, the inlet edge and the outlet edge are repaired by additive manufacturing, and then ground to the specified standard.

[0072] According to some embodiments of the present application, the positioning and clamping assembly 3 comprises a base 31 and a sliding block 32, the base 31 has a fixed clamping block 311 thereon, the sliding block 32 is slidably arranged in the base 31, a mounting hole is formed in the sliding block 32, the fixed clamping block 311 extends into the mounting hole, and the fixed clamping block 311 and the mounting hole are provided with a V-shaped groove 33 on one side in the sliding direction of the sliding block 32, and a limiting block 34 is also slidably arranged in the mounting hole, and the sliding direction of the limiting block 34 is the same as that of the sliding block 32.

[0073] According to some embodiments of the present application, the sliding block 32 is fixedly provided with a connecting rod 321 on the side opposite to the V-shaped groove 33, the base 31 is connected with a pressing block 312 through a screw, the connecting rod 321 penetrates through the pressing block 312 and is cooperatively provided with a knurled nut 322; a first guide rod 35 and a first spring 351 are arranged between the sliding block 32 and the base 31 in the sliding direction, the first spring 351 is sleeved on the first guide rod 35, and the two together constitute a guide structure of the sliding block 32; a second guide rod 36 and a second spring 361 are arranged between the limiting block 34 and the sliding block 32 in the sliding direction, the second spring 361 is sleeved on the second guide rod 36, and the two together constitute a guide structure of the limiting block 34, so that the sliding block 32 and the limiting block 34 can slide smoothly and reset.

[0074] When the stator blade 4 is installed, the tenon at the lower part of the disc of the stator blade 4 is inserted between the two V-shaped grooves 33, and then the sliding block is moved towards the fixed clamping block 311, while the flat part on the side of the disc of the stator blade 4 is attached to the limiting block 34, so that the positioning and clamping functions of the stator blade 4 can be realized.

[0075] The application obtains the appearance data of each blade section based on the established remanufacturing and repairing model, and is used for machining a plurality of inner arc surface templates 13 and a plurality of outer arc surface templates 12, and accurately manufacturing the profile detection tooling of the variable cross-section blade. Meanwhile, the size and chord length data of the inlet edge, the outlet edge to the stacking axis on the different blade sections are obtained, and the size detection tooling of different sections is manufactured, and the two toolings are used in cooperation, so that the repaired blade after the additive repair can be polished and shaped, the blade shape is restored, and it is ensured that the repaired blade meets the aerodynamic requirements of the engine blade shape.

[0076] The above specific embodiments further specifically explain the purposes, technical solutions and beneficial effects of the application. It should be understood that the above description is only a specific embodiment of the application and is not used to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A method for acquiring a variable cross-section blade remanufacturing repair model, characterized in that, The method comprises the following steps: S1, collecting point cloud data of different variable cross-section blade new pieces, and establishing a variable cross-section blade point cloud model; S2, obtaining a reference grid model in a weighted average manner according to the point cloud model in S1; S3, reconstructing the reference grid model in S2 to obtain a remanufacturing repair model of the variable cross-section blade; Specifically, step S2 comprises the following steps: S21, calculating an average point: selecting three grids, taking one grid as a calculation reference, selecting a point i on the grid as a reference point, calculating the deviation dij of the point i from each grid, and then calculating the average deviation dAVGi to obtain the average point AVGi; S22, calculating a weighted average point: calculating the deviation devij of each grid from the average point AVGi, then calculating the average deviation avg_dev, and then obtaining the weighted point dev'ij by weighting devij with the average deviation avg_dev, wherein if devij is greater than avg_dev, dev'ij is equal to avg_dev, otherwise dev'ij is equal to devij, and finally calculating the average value of the weighted point dev'ij, that is, the distance dev from the average point AVGi to the weighted average point AVGi', to obtain the weighted average point AVGi'; S23, calculating other points on the grid in the same way as in S21 and S22 to obtain a reference grid; S24, calculating all grids in the facet body in steps S21-S23 to obtain a reference grid model.

2. A variable cross-section blade inspection tool, characterized by, The profile detection tool comprises a positioning and clamping assembly arranged on a first base plate, a plurality of outer arc surface templates, and a plurality of inner arc surface templates; the positioning and clamping assembly is used to install and position the stator blade during detection; the plurality of outer arc surface templates and the plurality of inner arc surface templates are machined based on a remanufacturing repair model, the remanufacturing repair model is obtained according to the variable cross-section blade remanufacturing repair model obtaining method in claim 1, and the plurality of outer arc surface templates and the plurality of inner arc surface templates are respectively movably sleeved on two mandrels on the first base plate, and the axial distribution positions of the plurality of outer arc surface templates and the plurality of inner arc surface templates on the mandrels correspond to the positions of the blade profiles of the stator blade.

3. The variable cross-section blade inspection tooling of claim 2, wherein, The plurality of outer arc surface templates are machined according to the blade back appearance data of the blade profile sections of the remanufacturing repair model, and the plurality of inner arc surface templates are machined according to the blade basin appearance data of the blade profile sections of the remanufacturing repair model.

4. The variable cross-section blade inspection tooling of claim 2, wherein, The size detection tool further comprises a positioning and clamping assembly and a detection assembly arranged on a second base plate; the positioning and clamping assembly is used to install and position the stator blade during detection; the detection assembly has two detection assemblies arranged at right angles on the second base plate, and the detection assembly comprises a support and a measuring block connected to the support; the height of the measuring block from the second base plate is adjustable, and the horizontal distance of the measuring block from the stator blade is adjustable.

5. The variable cross-section blade inspection tooling of claim 4, wherein, The support is provided with a plurality of limiting holes in the height direction, and the vertical distribution positions of the limiting holes correspond to the positions of the cross sections of the stator blades; the support is further provided with a vertical sliding column, the vertical sliding column is provided with a rotation-preventing sliding block in a matched manner, the rotation-preventing sliding block is provided with a horizontal sliding column and a limiting pin in a matched manner, one end of the horizontal sliding column towards the stator blades is connected with a measuring block, and the limiting pin can be inserted into the limiting hole.

6. The variable cross-section blade inspection tooling of claim 2 or 4, wherein, The positioning and clamping assembly comprises a base and a sliding block, the base is provided with a fixed clamping block, the sliding block is slidably arranged in the base, a mounting hole is formed in the sliding block, the fixed clamping block extends into the mounting hole, a V-shaped groove is formed in one side of the fixed clamping block and the mounting hole in the sliding direction of the sliding block, and a limiting block is slidably arranged in the mounting hole and has the same sliding direction as the sliding block.

7. The variable cross-section blade inspection tooling of claim 6, wherein, A connecting rod is arranged on the side of the sliding block opposite to the V-shaped groove, a pressing block is arranged on the base, the connecting rod penetrates through the pressing block and is provided with a knurled nut in a matched manner, a first guide rod and a first spring are arranged between the sliding block and the base in the sliding direction, and a second guide rod and a second spring are arranged between the limiting block and the sliding block in the sliding direction.

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