Method and device for repairing variable-thickness blade tip by means of oscillating laser wire feeding and cladding

Abstract

The application discloses a method and device for repairing variable-thickness blade tip by swing laser wire feeding cladding, and the method comprises the following steps: segmenting a to-be-processed blade profile in a cladding direction, regarding each small blade width as equal, and designing corresponding cyclide laser swing trajectories according to each small blade width; the center intersection point of each small cyclide trajectory should coincide with the processing trajectory of the segment; selecting appropriate laser swing frequency, laser power, wire feeding speed and cladding speed according to the blade material and each small blade width; a galvanometer laser generates swing movement of laser at a fixed point along a preset trajectory, a to-be-repaired blade moves along the processing trajectory under the driving of a material carrying table, a wire feeder feeds wire, and the whole cladding process is completed. The application has high material utilization and good surface quality by studying the coupling behavior between wire and swing laser and adding material by wire feeding in the process of variable-width cladding.

Description

Technical Field

[0001] This invention belongs to the field of laser cladding and blade repair technology, specifically relating to a method and apparatus for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding, which can be used for additive repair of thin-walled blades with variable width. Background Technology

[0002] In defense sectors such as aviation and aerospace, variable wall thickness components occupy a crucial position, with turbine blades being one of the most representative parts, playing an extremely important and indispensable role in the aerospace and petrochemical industries. As key components of high-end equipment, turbine blades operate under harsh, high-temperature environments for extended periods, making them highly susceptible to wear and cracking, leading to equipment downtime or scrapping. However, directly replacing damaged parts results in enormous costs and waste. Laser repair technology, as a green and sustainable development approach, provides a solution for the recycling of gas turbine machinery, reducing resource waste caused by fatigue and wear failures in hot-end components and significantly lowering maintenance costs.

[0003] Currently, there are many problems to be solved in using laser cladding to repair blades, one of which is how to achieve varying thicknesses for thinner blades. For thicker blades, the traditional laser cladding method involves first forming the outer contour along the layered cross-section, and then filling the interior. However, during the outer contour forming process for thinner blades, the weld channels overlap due to the blade's thinness. Excessive overlap can cause unevenness on the cladding surface, leading to forming failure. Some researchers have tried to achieve variable-width structures by changing the laser defocusing amount in conjunction with a specialized cladding head and control system to change the spot size in real time. Other researchers have established mathematical models of the influence of laser cladding parameters on weld width based on extensive experiments, using ordinary powder-feeding cladding heads to achieve variable-width cladding by changing the overlap rate and scanning speed in real time during the cladding process. However, these methods have a narrow application range for the cladding heads, require extensive experiments to establish complex mathematical models, and all require specialized control systems, making them unsuitable for rapid application and repair needs. Summary of the Invention

[0004] To address the aforementioned technical problems in the existing technology, this invention provides a method and apparatus for repairing the tip of a variable wall thickness blade using oscillating laser wire feeding cladding. This method introduces oscillating laser welding technology into laser cladding forming, utilizing the property of the oscillating laser beam to promote the spread of the molten pool, thus spreading the molten wire throughout the molten pool and achieving wire feeding repair of the variable wall thickness blade.

[0005] The technical solution adopted in this invention is:

[0006] A method for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding, characterized by the following specific steps:

[0007] S1: Remove material from the blades according to the degree of damage to obtain a smooth surface to be processed;

[0008] S2: Fix the cut blade to be repaired onto the stage using the blade clamp. The surface of the blade to be repaired must be parallel to the processing plane.

[0009] S3: The blade to be repaired moves along the X and Y directions of the stage and the plane is measured by the laser profilometer. The complete blade profile data is compared to obtain the plane profile of the blade to be processed. The Hilditch thinning algorithm is used to obtain the center line of the plane profile of the blade to be processed as the processing trajectory.

[0010] S4: Divide the blade profile to be processed into segments in the cladding direction. The width of each segment is considered to be equal. Design the corresponding spiral laser oscillation trajectory according to the width of each segment.

[0011] S5: Throughout the cladding process, in order to ensure the continuous and stable transition behavior of the wire melting into the molten pool, the center intersection of each small segment of the spiral trajectory should coincide with the processing trajectory of that segment.

[0012] S6: Design the corresponding cladding speed according to the width of each small segment of the blade. The cladding speed in the X direction is related to the width of each small segment of the blade. The wider the width, the slower the speed. The cladding speed in the Y direction must ensure that the center intersection of the spiral oscillating laser coincides with the processing trajectory of that segment.

[0013] S7: Adjust the end of the filament to coincide with the center intersection of the spiral laser oscillation trajectory;

[0014] S8: Select appropriate laser oscillation frequency, laser power, wire feeding speed, and cladding speed according to the blade material and the width of each small segment of the blade;

[0015] S9: The galvanometer laser generates a laser beam that oscillates along a preset trajectory at a fixed point. The blade to be repaired moves along the processing trajectory under the drive of the stage. The wire feeder feeds the wire at a fixed wire feeding speed until the entire cladding process is completed.

[0016] S10: Adjust the height of the galvanometer laser and the position of the wire feed head according to the height of the cladding layer, and repeat S4 to S9 to perform the next layer of cladding until the repair is completed.

[0017] Furthermore, in step S6, during the i-th small segment of the leaf-shaped cladding process, X-side

[0018] The cladding speed is expressed as follows:

[0019]

[0020] Among them, S w This refers to the cross-sectional area of ​​the wire, in mm. 2 ;v w The wire feeding speed is expressed in mm / s; A i denoted as , where is the width of the i-th segment of the leaf shape, in mm; r is the diameter of the laser spot, in mm; and h is the expected single-layer cladding height, in mm.

[0021] The variable speed continuous cladding process ensures that the volume of filament deposited within a unit cladding volume is the same, thus achieving single-pass equal-height cladding forming of variable wall thickness cladding layers.

[0022] Furthermore, the galvanometer laser has a piezoresistive laser oscillation frequency of 200–500 Hz, a laser oscillation trajectory width variation range of 1–8 mm, a laser spot diameter of 0.6 mm, and a laser power of 600–900 W.

[0023] Furthermore, the wire feeding speed of the wire feeder varies from 3.5 to 5.0 mm / s.

[0024] A device for repairing the tip of a variable wall thickness blade using oscillating laser wire feeding cladding includes a frame, characterized in that it further includes a stage (1) mounted on the frame, a Y-direction ball linear guide rail (2) for the stage, an X-direction ball linear guide rail (3) for the stage, a wire feed head (5), a laser profilometer (6), a galvanometer laser (7), a galvanometer vertical motion guide rail (9), a cross stage (11), a wire feeder (12), an external control computer (13), and a laser water cooler (14); wherein:

[0025] The stage (1) is provided with a blade clamp for holding the blade (4) to be repaired. The stage (1) moves in the Y and X directions by means of the Y-direction ball linear guide (2) and the X-direction ball linear guide (3) driven by the guide rail motor. The blade (4) to be repaired moves with the stage (1) in the X and Y directions and the plane is measured by the laser profilometer (6).

[0026] The laser profilometer (6) and the galvanometer laser (7) are respectively mounted on the galvanometer bracket (8), and the laser profilometer (6) and the galvanometer laser (7) are located above the stage (1); the end of the galvanometer bracket (8) can move up and down along the galvanometer vertical motion guide rail (9); the galvanometer vertical motion guide rail (9) is set on the frame; the laser profilometer (6) and the galvanometer laser (7) are adjusted in focus through the galvanometer vertical motion guide rail;

[0027] A wire feeding head (5) is provided above the blade (4) to be repaired. The head of the wire feeding head (5) is fixed on the cross worktable (11) by a fixing member, and the tail of the wire feeding head (5) is connected to the wire feeder (12).

[0028] The external control computer (13) is connected to the laser profilometer (6), the galvanometer laser (7), the Y-direction ball bearing linear guide (2) of the stage, and the X-direction ball bearing linear guide (3) of the stage, respectively. It is used to receive the leaf shape data scanned by the laser profilometer (6), extract the profile center line and generate the laser oscillation trajectory based on the leaf shape data, control the galvanometer laser (7) to scan along the required trajectory, and control the Y-direction ball bearing linear guide (2) and the X-direction ball bearing linear guide (3) of the stage to move along the required trajectory.

[0029] The laser water chiller (14) needs to be turned on throughout the cladding process to cool the laser generator of the laser equipment with water circulation and control the operating temperature of the laser generator so that the laser generator can maintain normal operation for a long time.

[0030] Furthermore, the stage (1) carries the blade (4) to be repaired, which is fixed on the stage (1), along the pre-processing trajectory to complete the cladding process.

[0031] Furthermore, the installation height of the cross worktable (11) is adjustable. Adjusting the height of the cross worktable allows for fine-tuning of the position of the wire feeding head to obtain a suitable positional relationship for the optical filaments being processed.

[0032] Furthermore, the frame is provided with several sets of cross-shaped worktable fixing threaded holes (10) along the height direction, and the cross-shaped worktable (11) obtains a suitable installation height for processing through the cross-shaped worktable fixing threaded holes installed at different positions.

[0033] The key principle of this invention is as follows: during the cladding process, the laser parameters of the galvanometer laser and the galvanometer oscillation amplitude are changed in real time according to the blade width variation law. Combined with the dynamic balance equation of the filament-molten pool mass, the cladding speed is adjusted to achieve laser additive repair of blades with variable wall thickness. This invention overcomes the shortcomings of commonly used overlapping repair methods for blades with variable wall thickness, such as large machining allowances, significant heat-affected zones leading to blade failure, and the need for complex path planning. Furthermore, the material delivery method of filament feeding cladding has extremely high material utilization and good surface quality, meeting the high-quality repair requirements of blades with variable wall thickness.

[0034] Compared with the prior art, the beneficial effects of the present invention are reflected in:

[0035] 1. This invention introduces oscillating laser welding technology into laser cladding forming. By utilizing the characteristic that the oscillating laser beam can promote the spread of the molten pool, the molten wire is spread throughout the molten pool, thereby realizing the wire feeding repair of blades with variable wall thickness.

[0036] 2. This invention overcomes the shortcomings of traditional overlapping repair methods for variable wall thickness blades, such as large processing allowance, large heat-affected zone leading to blade failure, and the need for complex path planning, and can achieve high-quality repair of variable wall thickness blades.

[0037] 3. This invention studies the coupling behavior between the wire and the oscillating laser, and adds material by feeding the wire during the variable width cladding process. It has extremely high material utilization and good surface quality, simple process design, good process stability, and can generate certain economic benefits. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the device structure of the present invention;

[0039] Figure 2 This is the processing trajectory extraction process of the first embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram showing the positional relationship of a small segment of optical filament in the method of the first embodiment of the present invention;

[0041] Figures 4-7 This invention illustrates several trajectory variations of the double-twisted line under different trajectory profiles.

[0042] Figure 8 This is a fitting diagram of the blade profile using different laser oscillation trajectories in the method of the first embodiment of the present invention;

[0043] Figure 9 This is a diagram of the leaf-shaped outline and processing trajectory of the second embodiment of the present invention;

[0044] Figure 10 This is a fitting diagram of the blade profile using different laser oscillation trajectories in the second embodiment of the present invention;

[0045] Figure 11 This is a macroscopic morphological diagram of the leaf-shaped profile cladding in the second embodiment of the present invention. Detailed Implementation

[0046] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0048] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0049] Example 1

[0050] refer to Figures 2 to 8 The present invention provides a method for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding, the specific steps of which are as follows:

[0051] S1: Remove material from the blades according to the degree of damage to obtain a smooth surface to be processed;

[0052] S2: Fix the cut blade to be repaired onto the stage using the blade clamp. The surface of the blade to be repaired must be parallel to the processing plane.

[0053] S3: The blade to be repaired moves along the X and Y directions of the stage and the plane is measured by the laser profilometer. The complete blade profile data is compared to obtain the plane profile of the blade to be processed. The Hilditch thinning algorithm is used to obtain the center line of the plane profile of the blade to be processed as the processing trajectory.

[0054] S4: Divide the blade profile to be processed into segments in the cladding direction. The width of each segment is considered to be equal. Design the corresponding spiral laser oscillation trajectory according to the width of each segment.

[0055] S5: Throughout the cladding process, in order to ensure the continuous and stable transition behavior of the wire melting into the molten pool, the center intersection of each small segment of the spiral trajectory should coincide with the processing trajectory of that segment.

[0056] S6: Design the corresponding cladding speed according to the width of each small segment of the blade. The cladding speed in the X direction is related to the width of each small segment of the blade. The wider the width, the slower the speed. The cladding speed in the Y direction must ensure that the center intersection of the spiral oscillating laser coincides with the processing trajectory of that segment.

[0057] Specifically, in step S6, during the i-th segment of the leaf-shaped cladding process, the X direction...

[0058] The cladding speed is expressed as follows:

[0059]

[0060] Among them, S w This refers to the cross-sectional area of ​​the wire, in mm. 2 ;v w The wire feeding speed is expressed in mm / s; A i denoted as , where is the width of the i-th segment of the leaf shape, in mm; r is the diameter of the laser spot, in mm; and h is the expected single-layer cladding height, in mm.

[0061] The variable speed continuous cladding process ensures that the volume of filament deposited within a unit cladding volume is the same, thus achieving single-pass equal-height cladding forming of variable wall thickness cladding layers.

[0062] S7: Adjust the end of the filament to coincide with the center intersection of the spiral laser oscillation trajectory;

[0063] S8: Select appropriate laser oscillation frequency, laser power, wire feeding speed, and cladding speed according to the blade material and the width of each small segment of the blade;

[0064] S9: The galvanometer laser generates a laser beam that oscillates along a preset trajectory at a fixed point. The blade to be repaired moves along the processing trajectory under the drive of the stage. The wire feeder feeds the wire at a fixed wire feeding speed until the entire cladding process is completed.

[0065] S10: Adjust the height of the galvanometer laser and the position of the wire feed head according to the height of the cladding layer, and repeat S4 to S9 to perform the next layer of cladding until the repair is completed.

[0066] Specifically, the galvanometer laser has a gyroscope laser oscillation frequency of 200–500 Hz, a gyroscope trajectory width variation range of 1–8 mm, a laser spot diameter of 0.6 mm, and a laser power of 600–900 W.

[0067] Specifically, the wire feeding speed of the wire feeder varies from 3.5 to 5.0 mm / s.

[0068] Example 2

[0069] like Figure 9 and Figure 10 As shown, a simplified machining method is illustrated in a special case. If a straight line segment can run through the entire profile of the unequal-width blade, the machining trajectory does not need to be limited to the centerline. Selecting this straight line segment as the machining trajectory is sufficient to complete the unequal-width cladding. The result of a single-pass unequal-width cladding is shown below. Figure 11 As shown.

[0070] As a simplified processing method under special circumstances, the specific implementation steps are the same as in Example 1. It is not necessary to perform the contour extraction and refinement algorithm to obtain the blade skeleton in step S3 of Example 1. It is only necessary to use any straight line running through the entire blade as the processing trajectory. The remaining implementation methods of S1 to S2 and S4 to S10 are the same as in Example 1.

[0071] In summary, the method for repairing blade tips with variable wall thickness by oscillating laser wire feeding cladding provided in this embodiment achieves rapid and high-quality repair of blades with unequal width by introducing oscillating welding into wire feeding cladding.

[0072] Example 3

[0073] refer to Figure 1 The present invention discloses an apparatus for repairing the tip of a variable wall thickness blade using oscillating laser wire feeding cladding, comprising a frame, and further comprising a stage 1, a Y-direction ball linear guide rail 2, an X-direction ball linear guide rail 3, a wire feed head 5, a laser profilometer 6, a galvanometer laser 7, a galvanometer vertical motion guide rail 9, a cross stage 11, a wire feeder 12, an external control computer 13, and a laser water cooler 14, wherein:

[0074] The stage 1 is equipped with a blade clamp for holding the blade 4 to be repaired. The stage 1 moves in the Y and X directions through the Y-direction ball linear guide rail 2 and the X-direction ball linear guide rail 3 driven by the guide rail motor. The blade 4 to be repaired moves with the stage 1 in the X and Y directions and its plane is measured by the laser profilometer 6.

[0075] The laser profilometer 6 and the galvanometer laser 7 are respectively mounted on the galvanometer bracket 8, and the laser profilometer 6 and the galvanometer laser 7 are located above the stage 1; the end of the galvanometer bracket 8 can move up and down along the galvanometer vertical motion guide rail 9; the galvanometer vertical motion guide rail 9 is set on the frame; the laser profilometer 6 and the galvanometer laser 7 are adjusted in focus through the galvanometer vertical motion guide rail;

[0076] A wire feeding head 5 is provided above the blade 4 to be repaired. The head of the wire feeding head 5 is fixed on the cross worktable 11 by a fixing member, and the tail of the wire feeding head 5 is connected to the wire feeder 12.

[0077] The external control computer 13 is connected to the laser profilometer 6, the galvanometer laser 7, the Y-direction ball bearing linear guide 2 and the X-direction ball bearing linear guide 3 of the stage, respectively, to receive the leaf shape data scanned by the laser profilometer 6, extract the profile center line and generate the laser oscillation trajectory based on the leaf shape data, control the galvanometer laser 7 to scan along the required trajectory, and control the Y-direction ball bearing linear guide 2 and the X-direction ball bearing linear guide 3 of the stage to move along the required trajectory.

[0078] The laser water chiller 14 needs to be kept running throughout the cladding process to circulate water to cool the laser generator of the laser equipment and control the operating temperature of the laser generator so that the laser generator can maintain normal operation for a long time.

[0079] Specifically, the platform 1 carries the blade 4 to be repaired, which is fixed on the platform 1, along the pre-processing trajectory to complete the cladding process.

[0080] Specifically, the installation height of the cross worktable 11 is adjustable. Adjusting the height of the cross worktable allows for fine-tuning of the position of the wire feeding head to obtain a suitable positional relationship for the processed filaments.

[0081] Specifically, the frame has several sets of cross-shaped worktable fixing threaded holes 10 along the height direction, and the cross-shaped worktable 11 obtains a suitable installation height for processing through the cross-shaped worktable fixing threaded holes installed at different positions.

[0082] The key principle of this invention is as follows: during the cladding process, the laser parameters of the galvanometer laser and the galvanometer oscillation amplitude are changed in real time according to the blade width variation law. Combined with the dynamic balance equation of the filament-molten pool mass, the cladding speed is adjusted to achieve laser additive repair of blades with variable wall thickness. This invention overcomes the shortcomings of commonly used overlapping repair methods for blades with variable wall thickness, such as large machining allowances, significant heat-affected zones leading to blade failure, and the need for complex path planning. Furthermore, the material delivery method of filament feeding cladding has extremely high material utilization and good surface quality, meeting the high-quality repair requirements of blades with variable wall thickness.

[0083] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 limitations on this invention.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0085] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding, characterized in that, The specific steps are as follows: S1: Remove material from the blades according to the degree of damage to obtain a smooth surface to be processed; S2: Fix the cut blade to be repaired onto the stage using the blade clamp. The surface of the blade to be repaired must be parallel to the processing plane. S3: The blade to be repaired moves along the X and Y directions of the stage and the plane is measured by the laser profilometer. The complete blade profile data is compared to obtain the plane profile of the blade to be processed. The Hilditch thinning algorithm is used to obtain the center line of the plane profile of the blade to be processed as the processing trajectory. S4: Divide the blade profile to be processed into segments in the cladding direction. The width of each segment is considered to be equal. Design the corresponding spiral laser oscillation trajectory according to the width of each segment. S5: Throughout the cladding process, in order to ensure the continuous and stable transition behavior of the wire melting into the molten pool, the center intersection of each small segment of the spiral trajectory should coincide with the processing trajectory of that segment. S6: Design the corresponding cladding speed according to the width of each small segment of the blade. The cladding speed in the X direction is related to the width of each small segment of the blade. The wider the width, the slower the speed. The cladding speed in the Y direction must ensure that the center intersection of the spiral oscillating laser coincides with the processing trajectory of that segment. S7: Adjust the end of the filament to coincide with the center intersection of the spiral laser oscillation trajectory; S8: Select appropriate laser oscillation frequency, laser power, wire feeding speed, and cladding speed according to the blade material and the width of each small segment of the blade; S9: The galvanometer laser generates a laser beam that oscillates along a preset trajectory at a fixed point. The blade to be repaired moves along the processing trajectory under the drive of the stage. The wire feeder feeds the wire at a fixed wire feeding speed until the entire cladding process is completed. S10: Adjust the height of the galvanometer laser and the position of the wire feed head according to the height of the cladding layer, and repeat S4 to S9 to perform the next layer of cladding until the repair is completed.

2. The method for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding according to claim 1, characterized in that, In step S6, during the cladding process of the i-th small segment of the leaf shape, the cladding speed in the X direction is expressed as follows: Among them, S w This refers to the cross-sectional area of ​​the wire, in mm. 2 ;v w The wire feeding speed is expressed in mm / s; A i denoted as , where is the width of the i-th segment of the leaf shape, in mm; r is the diameter of the laser spot, in mm; and h is the expected single-layer cladding height, in mm. The variable speed continuous cladding process ensures that the volume of filament deposited within a unit cladding volume is the same, thus achieving single-pass equal-height cladding forming of variable wall thickness cladding layers.

3. A method for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding according to claim 1 or 2, characterized in that, The galvanometer laser has a gyroscope laser oscillation frequency of 200–500 Hz, a laser oscillation trajectory width variation range of 1–8 mm, a laser spot diameter of 0.6 mm, and a laser power of 600–900 W.

4. A method for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding according to claim 1 or 2, characterized in that, The wire feeding speed of the wire feeder varies from 3.5 to 5.0 mm / s.

5. A device for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding, comprising a frame, characterized in that, It also includes a stage (1) mounted on the frame, a Y-direction ball linear guide rail (2) for the stage, an X-direction ball linear guide rail (3) for the stage, a wire feeder (5), a laser profilometer (6), a galvanometer laser (7), a galvanometer vertical motion guide rail (9), a cross-shaped worktable (11), a wire feeder (12), an external control computer (13), and a laser water chiller (14); wherein: The stage (1) is provided with a blade clamp for holding the blade (4) to be repaired. The stage (1) moves in the Y and X directions by means of the Y-direction ball linear guide (2) and the X-direction ball linear guide (3) driven by the guide rail motor. The blade (4) to be repaired moves with the stage (1) in the X and Y directions and the plane is measured by the laser profilometer (6). The laser profilometer (6) and the galvanometer laser (7) are respectively mounted on the galvanometer bracket (8), and the laser profilometer (6) and the galvanometer laser (7) are located above the stage (1); the end of the galvanometer bracket (8) can move up and down along the galvanometer vertical motion guide rail (9); the galvanometer vertical motion guide rail (9) is set on the frame; the laser profilometer (6) and the galvanometer laser (7) are adjusted in focus through the galvanometer vertical motion guide rail; A wire feeding head (5) is provided above the blade (4) to be repaired. The head of the wire feeding head (5) is fixed on the cross worktable (11) by a fixing member, and the tail of the wire feeding head (5) is connected to the wire feeder (12). The external control computer (13) is connected to the laser profilometer (6), the galvanometer laser (7), the Y-direction ball linear guide rail (2) of the stage, and the X-direction ball linear guide rail (3) of the stage, respectively, to receive the leaf shape data scanned by the laser profilometer (6), extract the profile center line and generate the laser swing trajectory based on the leaf shape data, control the galvanometer laser (7) to scan along the required trajectory, and control the Y-direction ball linear guide rail (2) and the X-direction ball linear guide rail (3) of the stage to move along the required trajectory; The laser water chiller (14) needs to be turned on throughout the cladding process to cool the laser generator of the laser equipment with water circulation and control the operating temperature of the laser generator so that the laser generator can maintain normal operation for a long time.

6. The device for repairing the tip of a blade with variable wall thickness using oscillating laser wire feeding cladding according to claim 5, characterized in that, The stage (1) carries the blade (4) to be repaired, which is fixed on the stage (1), along the pre-processing trajectory to complete the cladding process.

7. The device for repairing the tip of a blade with variable wall thickness by oscillating laser wire feeding cladding according to claim 5, characterized in that, The installation height of the cross worktable (11) is adjustable. Adjusting the height of the cross worktable allows for fine-tuning of the position of the wire feeding head to obtain a suitable positional relationship for the optical filaments being processed.

8. The device for repairing the tip of a blade with variable wall thickness by oscillating laser wire feeding cladding according to claim 7, characterized in that, The frame is provided with several sets of cross-shaped worktable fixing threaded holes (10) along the height direction. The cross-shaped worktable (11) is installed at a suitable installation height for processing by the cross-shaped worktable fixing threaded holes installed at different positions.

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