Adjustable guide vane angle repair method, adjustable guide vanes and aero engines

Abstract

This invention discloses a method for repairing the angle of an adjustable guide vane, an adjustable guide vane, and an aero-engine. The adjustable guide vane includes a blade and a rotating handle. The rotating handle is threaded to the top of the blade or the blade and the rotating handle are integrally formed. The rotating handle has two parallel positioning surfaces for rotating the blade around the axis of the rotating handle under external drive. The method for repairing the angle of the adjustable guide vane includes: measuring the angle of the entire circle of the adjustable guide vane in the assembled state; correcting the positioning surface angle of the rotating handle of the adjustable guide vane with an unqualified angle; electroplating a repair layer on the two positioning surfaces of the rotating handle of the adjustable guide vane that is still unqualified after re-measuring; machining the positioning surface based on the target correction angle; replacing the rotating handle of the adjustable guide vane that is still unqualified after re-measuring; and repeating the operation until the entire circle of the blade is qualified.

Description

Technical Field

[0001] This invention relates to the field of aero-engine machining technology, and in particular, to a method for repairing adjustable guide vane angles. Furthermore, this invention also relates to an adjustable guide vane and an aero-engine incorporating the aforementioned method for repairing adjustable guide vane angles. Background Technology

[0002] Adjustable guide vanes are frequently used in multi-stage axial or axial-centrifugal compressors for aero engines. Electronic controllers adjust the rotation angle of these adjustable vanes according to control principles to ensure they meet requirements. By rotating the guide vanes, the compressor regulates the airflow direction and effective flow area, improving the engine's stable operating range. The rotation position of the adjustable guide vanes significantly impacts the compressor's surge margin; during engine operation, the guide vanes must be positioned at the correct angle. For example, at low to medium engine speeds, a larger guide vane angle needs to be closed, while at high speeds, only a small angle needs to be closed to ensure a wider stable operating range. The compressor guide vane adjustment mechanism is crucial for stable engine operation; therefore, the blade angles of the adjustment mechanism must meet requirements before the engine leaves the factory.

[0003] The adjustable stator mechanism of an aero-engine compressor involves multiple components. Due to the dispersed nature of manufacturing, random factors in the assembly process, or long-term use of the adjustable blades, the angle of the adjustable blades may deviate from the theoretical angle. The allowable value of the deviation is related to the engine type. If the deviation angle exceeds the allowable range, it will affect the surge margin of the aero-engine compressor and endanger the engine's operational safety. Currently, when the adjustable blade angle does not meet the design requirements or the deviation angle of a certain blade exceeds the allowable range, the adjustable blade is replaced or corrected. However, the correction angle is extremely limited, so the replaced blades are usually scrapped. The service life of the replaced adjustable blades may not have expired, and direct scrapping results in resource waste and high costs. Summary of the Invention

[0004] This invention provides a method for repairing adjustable guide vane angles, an adjustable guide vane, and an aero-engine, to solve the technical problem of high cost in replacing new blades when the adjustable guide vane angle does not meet design requirements in the prior art.

[0005] According to one aspect of the present invention, a method for repairing the angle of an adjustable guide vane is provided. The adjustable guide vane includes a blade and a rotating handle. The rotating handle is threadedly connected to the top of the blade or the blade and the rotating handle are integrally formed. The rotating handle has two parallel positioning surfaces for rotating the blade around the axis of the rotating handle under external drive. The method for repairing the angle of the adjustable guide vane includes: measuring the angle of the entire circle of the adjustable guide vane in the assembled state; correcting the positioning surface angle of the rotating handle of the adjustable guide vane with an unqualified angle; electroplating a repair layer on the two positioning surfaces of the rotating handle of the still unqualified adjustable guide vane after remeasurement; machining the positioning surface based on the target correction angle; replacing the rotating handle of the still unqualified adjustable guide vane after remeasurement; and repeating the operation until the entire circle of the blade is qualified.

[0006] As a further improvement to the above technical solution, the adjustable guide vane angle repair method includes:

[0007] S1. Prepare the compressor adjustable guide vanes in the component state and number the entire circle of blades sequentially;

[0008] S2. Measure the angle of the blades of the entire circle of adjustable guide vanes. If the angle measurement of the entire circle of blades is qualified, proceed to step S10. If there are blades with unqualified angles, screen out the unqualified guide vanes and proceed to step S3.

[0009] S3. Based on the relationship between the measurement angle and the usage angle of the defective blade, calculate the correction angle of the rotating handle positioning surface and correct the positioning surface of the rotating handle of the defective guide vane.

[0010] S4. The corrected adjustable guide vane is reinstalled in situ;

[0011] S5. Measure the angle of the blades of the entire circle of adjustable guide vanes. If the angle measurement of the entire circle of blades is qualified, proceed to step S6. If there are blades with unqualified angles, screen out the unqualified guide vanes and proceed to step S7.

[0012] S6. Electroplat a repair layer on the two positioning surfaces of the handle corresponding to the defective blade;

[0013] S7. The positioning surface of the rotor of the defective blade is machined based on the target correction angle;

[0014] S8. The repaired adjustable guide vane is reinstalled in its original position;

[0015] S9. Measure the angle of the blades of the entire adjustable guide vane. If the angle measurement of the entire blade is qualified, proceed to step S10. If there are blades with unqualified angles, replace them with new handles and proceed to step S2.

[0016] S10. Adjustable guide vanes are qualified.

[0017] As a further improvement to the above technical solution, when measuring the angle of the blades of the entire adjustable guide vane, the adjustable guide vane angle repair method further includes:

[0018] The adjustable guide vane angle is measured to obtain the blade angle distribution. Based on the upper and lower limits of the allowable angle deviation, the deviation angle distribution is fitted by a cubic function curve. Based on minimizing the sum of the squares of the distances from each point to the fitted curve, the coefficients of the fitted curve equation are solved by the least squares method to obtain the upper and lower limits of the fitted curve equation. The upper and lower limits of the allowable angle deviation range are used as the boundaries. If the angle deviation value exceeds the allowable angle deviation range, the corresponding blade is judged to be unqualified.

[0019] As a further improvement to the above technical solution, when calculating the correction angle of the crank positioning surface, the deviation angle is calculated by the difference between the measured angle and the fitted curve function, and the correction angle is calculated by the theoretical angle and the deviation angle between the positioning surface and the plane containing the crank axis and the engine shaft axis.

[0020] As a further improvement to the above technical solution, the adjustable guide vane angle repair method includes:

[0021] The fitted curve equation is expressed in equation [formula missing]. The equation for the upper limit of the fitted curve is: The lower limit equation of the fitted curve is In the formula, x represents the leaf sequence mark. The allowable angle range for angle deviation. = , The upper limit angle allowed for angular deviation, The lower limit angle for allowable angular deviation.

[0022] As a further improvement to the above technical solution, the adjustable guide vane angle repair method includes the following steps when calculating the correction angle:

[0023] Mark the defective blades in sequence. Substituting into the fitted curve equation, we get According to the formula Calculate the deviation angle according to the formula. In the formula, The measurement angle of the defective blade is incorrect. The deviation angle, This is the theoretical angle between the positioning surface and the plane containing the axis of the rotating handle and the axis of the engine rotating shaft.

[0024] As a further improvement to the above technical solution, when electroplating repair layers on the two positioning surfaces of the rotating handle of the defective adjustable guide vane, the adjustable guide vane angle repair method further includes:

[0025] Clean the blades and rotor to remove the oxide film on the surface; immerse the blades and rotor in a nickel-based electroplating solution, set the pH value, electroplating solution temperature, current intensity and time, and plate nickel alloy on the positioning surfaces on both sides of the rotor.

[0026] As a further improvement to the above technical solution, step S1 also includes:

[0027] If the adjustable guide vane's handle and the blade are integrally formed, proceed to step S5; if the adjustable guide vane's handle and the blade are threadedly connected, proceed to step S2.

[0028] According to another aspect of the present invention, an adjustable guide vane is also provided, which includes the above-described adjustable guide vane angle repair method.

[0029] According to another aspect of the invention, an aircraft engine is also provided, which includes the aforementioned adjustable guide vanes.

[0030] The present invention has the following beneficial effects:

[0031] This adjustable guide vane angle repair method involves adjusting the angle of the entire adjustable guide vane circuit, correcting the angle of blades with substandard angles, and re-measuring them. If the angle is still substandard, a repair layer is electroplated on the positioning surface of the handle of the substandard guide vane. The repair layer is then overhauled according to the repair angle. After overhaul, the guide vane is reinstalled and the angle is measured again. If the angle is still substandard, the blade is scrapped and replaced with a new blade. The aforementioned steps are repeated until all guide vane angles meet the standard requirements. This method adjusts the angle of the adjustable guide vane blades by prioritizing correction and overhaul, effectively reducing resource waste caused by scrapped guide vanes and reducing costs. Furthermore, the electroplated repair layer significantly increases the machinability of the positioning surface, thereby improving the feasibility of machining overhaul and increasing the pass rate after machining overhaul of the positioning surface. The blade angle is re-measured after each correction, overhaul, or blade replacement operation to ensure that the overhauled blades meet the standard requirements.

[0032] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a schematic diagram of the structure of an adjustable guide vane in existing technology;

[0035] Figure 2 This is a schematic diagram of the theoretical angle αfa between the positioning surface of the adjustable guide vane's handle and the plane containing the handle axis and the engine shaft axis, according to a preferred embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of the compressor assembly state according to a preferred embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the blade sequential numbering structure of a preferred embodiment of the present invention;

[0038] Figure 5 This is a distribution diagram of the adjustable guide vane angle deviation in Embodiment 1 of the present invention. Detailed Implementation

[0039] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0040] Figure 1 This is a schematic diagram of the structure of an adjustable guide vane in existing technology; Figure 2 This is a schematic diagram of the theoretical angle afa between the positioning surface of the adjustable guide vane's handle and the plane containing the handle axis and the engine shaft axis of the prior art. Figure 3 This is a schematic diagram of the assembly state of the compressor part in the existing technology; Figure 4 This is a schematic diagram of the blade sequential numbering structure of a preferred embodiment of the present invention; Figure 5 This is a distribution diagram of the adjustable guide vane angle deviation in Embodiment 1 of the present invention.

[0041] like Figures 1 to 5 As shown, the adjustable guide vane angle repair method of this embodiment includes an adjustable guide vane comprising a blade and a rotating handle. The rotating handle is threaded to the top of the blade or the blade and the rotating handle are integrally formed. The rotating handle has two parallel positioning surfaces for rotating the blade around the axis of the rotating handle under external drive. The adjustable guide vane angle repair method includes: measuring the angle of the entire circle of adjustable guide vanes in the assembled state; correcting the positioning surface angle of the rotating handle of the adjustable guide vane with unqualified angle; electroplating repair layers on the two positioning surfaces of the rotating handle of the still unqualified adjustable guide vane after remeasurement; machining the positioning surfaces based on the target correction angle; replacing the rotating handle of the still unqualified adjustable guide vane after remeasurement; and repeating the operation until the entire circle of blades is qualified.

[0042] The positioning surface width is L, and the diameter of the cylinder containing the positioning surface is D. The value of L is approximately 0.75D. If the positioning surface is too small, it may cause slippage when the drive mechanism is engaged, resulting in insufficient rotation angle of the blades. It will also cause the positioning surface to wear more easily, affecting its service life.

[0043] Understandably, this adjustable guide vane angle repair method involves correcting and re-measuring the angle of blades with substandard angles across the entire adjustable guide vane ring. If the angle is still substandard, a repair layer is electroplated onto the positioning surface of the rotating handle of the substandard guide vane. The repair layer is then overhauled according to the repair angle. After overhaul, the guide vane is reinstalled and the angle is measured again. If the angle is still substandard, the blade is scrapped and replaced with a new blade. The aforementioned steps are repeated until all guide vane angles meet the standard requirements. This method adjusts the angle of the adjustable guide vane blades by prioritizing correction and overhaul, effectively reducing resource waste caused by scrapped guide vanes and reducing costs. Furthermore, the electroplated repair layer significantly increases the machinability of the rotating handle positioning surface, thereby improving the feasibility of machining overhaul and increasing the pass rate after machining overhaul of the positioning surface. The blade angle is re-measured after each correction, overhaul, or blade replacement operation to ensure that the overhauled blades meet the standard requirements.

[0044] In some preferred embodiments, the adjustable guide vane angle repair method includes:

[0045] S1. Prepare the compressor's adjustable guide vanes in the component state, and number the entire ring of vanes sequentially; the numbering can be counterclockwise or clockwise;

[0046] For example, in one specific embodiment, reference Figure 4 The blades can be numbered clockwise using the numbers 1, 2...;

[0047] S2. Measure the angle of the blades of the entire circle of adjustable guide vanes. If the angle measurement of the entire circle of blades is qualified, proceed to step S10. If there are blades with unqualified angles, screen out the unqualified guide vanes and proceed to step S3. The measurement method is implemented with reference to existing technology, which can be a three-coordinate measuring machine or blue light scanning to measure the angle of the adjustable guide vanes.

[0048] S3. Based on the relationship between the measurement angle and the usage angle of the defective blade, calculate the correction angle of the rotating handle positioning surface and correct the positioning surface of the rotating handle of the defective guide vane.

[0049] S4. The corrected adjustable guide vane is reinstalled in situ;

[0050] S5. Measure the angle of the blades of the entire circle of adjustable guide vanes. If the angle measurement of the entire circle of blades is qualified, proceed to step S6. If there are blades with unqualified angles, screen out the unqualified guide vanes and proceed to step S7.

[0051] S6. Electroplat a repair layer on the two positioning surfaces of the handle corresponding to the defective blade;

[0052] S7. The positioning surface of the rotor of the defective blade is machined based on the target correction angle;

[0053] S8. The repaired adjustable guide vane is reinstalled in its original position;

[0054] S9. Measure the angle of the blades of the entire adjustable guide vane. If the angle measurement of the entire blade is qualified, proceed to step S10. If there are blades with unqualified angles, replace them with new handles and proceed to step S2.

[0055] S10. Adjustable guide vanes are qualified.

[0056] Understandably, after angle measurement, defective blades are first corrected by adjusting the installation angle between the handle and the blade. If they are still defective after remeasurement, the angle of the adjustable guide vane is adjusted by electroplating followed by machining repair. This effectively reduces resource waste caused by scrapped guide vanes, lowers costs, and significantly increases the machinability of the positioning surface through the electroplating repair layer, thereby improving the feasibility of machining repair and increasing the pass rate of the positioning surface after machining repair. The blade angle is remeasured after correction, repair, or blade replacement to ensure that the repaired blade meets the standard requirements.

[0057] In some preferred embodiments, when measuring the angle of the blades of the entire adjustable guide vane, the adjustable guide vane angle repair method further includes:

[0058] The adjustable guide vane angle is measured to obtain the blade angle distribution. Based on the upper and lower allowable angle deviation limits, the deviation angle distribution is fitted by a cubic function curve. By minimizing the sum of the squares of the distances from each point to the fitted curve, the coefficients of the fitted curve equation are solved using the least squares method, yielding the upper and lower limit equations of the fitted curve. The upper and lower limits of the allowable angle deviation range are used as the boundary; if the angle deviation exceeds the allowable range, the corresponding blade is considered unqualified. In essence, the fitted curve equations allow the distribution of each point to be fitted into a smooth curve, and based on this, the upper and lower limits of the fitted curve are obtained. Whether the blade is qualified is determined by whether the point distribution deviates from the fitted curve beyond the allowable deviation range, thus avoiding large deviations in blade angle compared to adjacent blades, making the blade angle distribution more reasonable, and contributing to improved compressor performance.

[0059] In some preferred embodiments, when calculating the correction angle of the crank positioning surface, the deviation angle is calculated using the difference between the measured angle and the fitted curve function, and the position is adjusted based on the relationship between the positioning surface and the crank axis, and the engine shaft (…). Figure 2 The theoretical included angle and deviation angle between the planes containing the X-axis (shown) are calculated to correct the angle. It can be understood that by using this correction method, the corrected blade angle can be within the deviation fitting curve, thereby making the blade angle distribution reasonable and beneficial to improving compressor performance.

[0060] Specifically, methods for repairing adjustable guide vane angles include:

[0061] The fitted curve equation is expressed in equation [formula missing]. The equation for the upper limit of the fitted curve is: The lower limit equation of the fitted curve is In the formula, x represents the leaf sequence mark. The allowable angle range for angle deviation. = , The upper limit angle allowed for angular deviation, The lower limit angle for allowable angular deviation is defined; where x can be the sequential number of the blades (1, 2, 3...) or the angular position of the blades. For example, when there are 30 blades, x would be 0°, 12°, 24°... The deviation angle distribution is fitted using a cubic function curve. The coefficients of the fitted curve equation are obtained by solving the least squares method with the goal of minimizing the sum of the squared distances from each point to the fitted curve. , , , .

[0062] Specifically, when calculating the correction angle, the adjustable guide vane angle repair methods include:

[0063] Mark the defective blades in sequence. Substituting into the fitted curve equation, we get According to the formula Calculate the deviation angle according to the formula. In the formula, The measurement angle of the defective blade is incorrect. The deviation angle, This is the theoretical angle between the positioning surface and the plane containing the axis of the rotating handle and the axis of the engine rotating shaft;

[0064] In some preferred embodiments, when the adjustable guide vane is reinstalled in situ, the blade is reinstalled on the compressor in situ and cannot be installed in other angular positions. This ensures that the blade installation position number after overhaul is consistent with the number position before disassembly, and ensures that the blade angle distribution after overhaul meets the fitting curve in each angular position, thus avoiding a sudden and significant deviation of a certain blade angle from the nearby blade angle.

[0065] In some preferred embodiments, when electroplating repair layers on the two positioning surfaces of the handle of the defective adjustable guide vane, the adjustable guide vane angle repair method further includes:

[0066] Clean the blades and rotor to remove the oxide film on the surface; immerse the blades and rotor in a nickel-based electroplating solution, set the pH value, electroplating solution temperature, current intensity and time, and plate nickel alloy on the positioning surfaces on both sides of the rotor.

[0067] In some preferred embodiments, step S1 further includes:

[0068] If the adjustable guide vane's handle and blade are integrally formed, proceed to step S5; if the adjustable guide vane's handle and blade are threadedly connected, proceed to step S2. It is understood that the adjustable guide vane's handle and blade can be integrally formed or threadedly connected. If it is an integrally formed structure, angle correction is not possible. If there are defective blades and it is an integrally formed structure, an electroplated repair layer will be applied first. If it is a separate, threaded structure, angle correction will be applied first to defective blades, simplifying the operation and reducing costs.

[0069] On the other hand, a preferred embodiment of the present invention also provides an adjustable guide vane, which is applied to the above-mentioned adjustable guide vane angle repair method.

[0070] On the other hand, a preferred embodiment of the present invention also provides an aero-engine that utilizes the aforementioned adjustable guide vanes.

[0071] Example 1

[0072] In this embodiment, reference Figure 5 After sequentially numbering the blades, the deviation angles of blades 1, 2, 3, ..., 25 are measured using P1, P2, P3, ..., P25. The upper and lower limits of the allowable angle deviation range are used as the measurement boundaries; if the angle deviation exceeds the allowable range, it is considered unqualified. Figure 5 The allowable angular deviation range is , Among them, blades p7, p9, p11, p21, and p24 have deviation angles exceeding the allowable value and are therefore defective, requiring repair. Condition 2: Simultaneously, using the upper and lower limits of the fitted curve for angle deviation as boundaries, blades exceeding these limits are considered defective. Blades P5 and P17 exceeded the upper and lower limits of the fitted curve and were judged to be unqualified blades, requiring repair. The unqualified blade numbers were substituted into the fitted curve equation to calculate the deviation angle, which was then used to obtain a correction angle. This correction angle was used to correct the blade deviation angle, ensuring it fell on the deviation fitted curve, thus achieving a reasonable blade angle distribution. If unqualified blades remained after correction, the unqualified blades and the rotor were cleaned to remove the surface oxide film. The blade rotor was then immersed in a nickel-based electroplating solution. Appropriate pH value, electroplating solution temperature, current intensity, and time were selected to plate nickel alloy on the positioning surfaces on both sides of the rotor, ensuring a strong bond between the plating layer and the substrate. After electroplating the unqualified blade rotor area, the positioning surfaces of the rotor area were re-machined according to the corrected angle. The machined blades underwent metrological inspection. After passing the inspection, the repaired blades were obtained. After re-metrological inspection, the unqualified blades were directly disassembled and replaced. This met the metrological requirements, reducing component scrap and improving economic efficiency.

[0073] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0074] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for repairing the angle of an adjustable guide vane, the adjustable guide vane comprising a blade and a rotating handle, wherein the rotating handle is threadedly connected to the top of the blade or the blade and the rotating handle are integrally formed, the rotating handle having two parallel positioning surfaces for rotating the blade around the axis of the rotating handle under external drive, characterized in that, The adjustable guide vane angle repair method includes: S1. Prepare the compressor adjustable guide vanes in the component state and number the entire circle of blades sequentially; S2. Measure the angle of the blades of the entire circle of adjustable guide vanes. If the angle measurement of the entire circle of blades is qualified, proceed to step S10. If there are blades with unqualified angles, screen out the unqualified guide vanes and proceed to step S3. S3. Based on the relationship between the measurement angle and the usage angle of the defective blade, calculate the correction angle of the rotating handle positioning surface and correct the positioning surface of the rotating handle of the defective guide vane. S4. The corrected adjustable guide vane is reinstalled in situ; S5. Measure the angle of the blades of the entire circle of adjustable guide vanes. If the angle measurement of the entire circle of blades is qualified, proceed to step S6. If there are blades with unqualified angles, screen out the unqualified guide vanes and proceed to step S7. S6. Electroplat a repair layer on the two positioning surfaces of the handle corresponding to the defective blade; S7. The positioning surface of the rotor of the defective blade is machined based on the target correction angle; S8. The repaired adjustable guide vane is reinstalled in its original position; S9. Measure the angle of the blades of the entire adjustable guide vane. If the angle measurement of the entire blade is qualified, proceed to step S10. If there are blades with unqualified angles, replace them with new handles and proceed to step S2. S10. Adjustable guide vanes are qualified.

2. The adjustable guide vane angle repair method according to claim 1, characterized in that, When measuring the angle of the blades of the entire adjustable guide vane, the adjustable guide vane angle repair method further includes: The adjustable guide vane angle is measured to obtain the blade angle distribution. Based on the upper and lower limits of the allowable angle deviation, the deviation angle distribution is fitted by a cubic function curve. Based on minimizing the sum of the squares of the distances from each point to the fitted curve, the coefficients of the fitted curve equation are solved by the least squares method to obtain the upper and lower limits of the fitted curve equation. The upper and lower limits of the allowable angle deviation range are used as the boundaries. If the angle deviation value exceeds the allowable angle deviation range, the corresponding blade is judged to be unqualified.

3. The adjustable guide vane angle repair method according to claim 2, characterized in that, When calculating the correction angle of the crank positioning surface, the deviation angle is calculated by the difference between the measured angle and the fitted curve function, and the correction angle is calculated by the theoretical angle and the deviation angle between the positioning surface and the plane containing the crank axis and the engine shaft axis.

4. The adjustable guide vane angle repair method according to claim 3, characterized in that, The adjustable guide vane angle repair method includes: The fitted curve equation is expressed in equation [formula missing]. The equation for the upper limit of the fitted curve is: The lower limit equation of the fitted curve is In the formula, x represents the leaf sequence mark. The allowable angle range for angle deviation. = , The upper limit angle allowed for angular deviation, The lower limit angle for allowable angular deviation.

5. The adjustable guide vane angle repair method according to claim 4, characterized in that, When calculating the correction angle, the adjustable guide vane angle repair method includes: Mark the defective blades in sequence. Substituting into the fitted curve equation, we get According to the formula Calculate the deviation angle according to the formula. In the formula, The measurement angle of the defective blade is incorrect. The deviation angle, This is the theoretical angle between the positioning surface and the plane containing the axis of the rotating handle and the axis of the engine rotating shaft.

6. The adjustable guide vane angle repair method according to claim 1, characterized in that, When electroplating repair layers onto the two positioning surfaces of the rotating handle of a defective adjustable guide vane, the adjustable guide vane angle repair method further includes: Clean the blades and rotor to remove the oxide film on the surface; immerse the blades and rotor in a nickel-based electroplating solution, set the pH value, electroplating solution temperature, current intensity and time, and plate nickel alloy on the positioning surfaces on both sides of the rotor.

7. The adjustable guide vane angle repair method according to any one of claims 1-5, characterized in that, Step S1 also includes: If the adjustable guide vane's handle and the blade are integrally formed, proceed to step S5; if the adjustable guide vane's handle and the blade are threadedly connected, proceed to step S2.

8. An adjustable guide vane, characterized in that, The method for repairing the adjustable guide vane angle as described in any one of claims 1-7 is applicable.

9. An aircraft engine, characterized in that, The application has the adjustable guide vane as described in claim 8.

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