Method and device for repairing blade tip of variable-wall-thickness blade through swing laser wire feeding cladding

Abstract

The invention discloses a method and device for repairing a blade tip of a variable-wall-thickness blade through swing laser wire feeding cladding, and the method comprises the steps that a to-be-machined blade shape contour is segmented in the cladding direction, the width of each small section of the blade shape is regarded as equal, and a corresponding neonatal laser swing track is designed according to the width of each small section of the blade shape; the central intersection point of each small section of the neuron-line-shaped track is overlapped with the processing track of the section of the neuron-line-shaped track; appropriate laser swing frequency, laser power, wire feeding speed and cladding speed are selected according to the blade material and the width of each small section of blade shape; the galvanometer type laser generates laser to swing at a fixed point in a preset track, the blade to be repaired is driven by the objective table to move along a machining track, and the wire feeder feeds wires until the whole cladding process is completed. According to the method, the coupling behavior between the wire and the swing laser is researched, the material is added by adopting a wire feeding method in the variable-width cladding process, and the extremely high material utilization rate and the good surface quality are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser cladding and blade repair, and specifically relates to a method and device for repairing the tip of a blade with variable wall thickness by oscillating laser wire feeding cladding, which can be used for additive repair of thin-walled and widened blades. Background Art

[0002] In the defense fields such as aviation and aerospace, variable wall thickness and thin wall parts occupy an important position. Among them, turbine blades are one of the most representative parts, and they play an extremely important and indispensable role in the aerospace and petrochemical industries. As a key component of high-end equipment, turbine blades have been in service for a long time in harsh high-temperature environments. Therefore, they are prone to wear and cracking, which can lead to equipment shutdown or scrapping. However, directly replacing damaged parts will incur huge costs and waste. As a green and sustainable technical means, laser repair technology provides a solution for the recycling of gas turbine machinery, reduces the waste of resources caused by fatigue, wear and other failure behaviors of hot end components, and greatly reduces maintenance costs.

[0003] At present, there are many urgent problems to be solved in the use of laser cladding to repair blades. One of the difficulties is how to achieve the change of thickness of thinner blades. For thicker blades, according to the traditional laser cladding forming method, the outer contour of the layered section is first formed, and then the inside is filled. However, during the outer contour forming process of thinner blades, due to the thin thickness of the blades, the melt channels will overlap together. Excessive overlap rate can easily cause the surface of the cladding layer to be uneven, resulting in forming failure. At present, some scholars have changed the laser defocus amount, and at the same time, cooperated with a special cladding head and control system to change the spot size in real time, thereby realizing the formation of variable width structure. Some scholars have also established a mathematical model of the influence of laser cladding parameters on the melt width based on a large number of experiments, and used an ordinary powder feeding cladding head for variable width cladding by changing the overlap rate and scanning speed in real time during the cladding process. However, the application range of these methods is narrow, and a large number of experiments are required to establish complex mathematical models, and they all need to cooperate with a special control system, which is not suitable for rapid application and repair needs. Summary of the invention

[0004] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a method and device for repairing the tip of a blade with variable wall thickness by swinging laser wire feeding cladding, introduces the swinging laser welding technology into laser cladding forming, utilizes the characteristic that the swinging laser beam can promote the spreading of the molten pool, spreads the molten wire to the entire molten pool, and realizes wire feeding repair of blades with variable wall thickness.

[0005] The technical solution adopted by the present invention is:

[0006] A method for repairing the tip of a blade with variable wall thickness by swinging laser wire feeding cladding, characterized in that the specific steps are as follows:

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

[0008] S2: Fix the cut blade to be repaired on the stage through a blade fixture, and the surface to be processed 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 a laser profiler, and the complete blade profile data is compared to obtain the plane profile of the blade to be processed, and the center line of the plane profile of the blade to be processed is obtained by using the Hilditch thinning algorithm as the processing trajectory;

[0010] S4: Divide the blade profile to be processed into segments in the cladding direction, consider the width of each small segment of the blade profile to be equal, and design a corresponding kink-shaped laser swing trajectory according to the width of each small segment of the blade profile;

[0011] S5: During the entire cladding process, in order to ensure the continuous and stable transition behavior of the wire melting into the molten pool, the central intersection of each small segment of the knotted linear 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 needs to ensure that the central intersection of the kink-shaped oscillating laser coincides with the processing trajectory of the segment.

[0013] S7: adjusting the end of the wire to coincide with the central intersection of the kink-shaped 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 blade section;

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

[0016] S10: According to the height of the cladding layer, the height of the galvanometer laser and the position of the wire feeding head are adjusted, and S4 to S9 are repeated to perform the next layer of cladding until the repair is completed.

[0017] Further, in step S6, during the cladding process of the i-th small segment blade, the X side

[0018] The cladding speed is expressed as follows:

[0019]

[0020] Among them, S w is the cross-sectional area of ​​the wire, in mm 2 ;v w is the wire feeding speed, the unit is mm / s; A i is the width of the i-th segment of the leaf shape, in mm; r is the diameter of the laser spot, in mm; h is the expected single-layer cladding height, in mm;

[0021] During the entire cladding process, the cladding is carried out continuously at a variable speed to ensure that the volume of wire deposited within the unit cladding volume is the same, thus achieving single-pass equal-height cladding forming of variable wall thickness cladding layers.

[0022] Furthermore, the kink-shaped laser oscillation frequency of the galvanometer laser is 200-500 Hz, the width variation range of the laser oscillation track is 1-8 mm, the laser spot diameter is 0.6 mm, and the laser power is 600-900 W.

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

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

[0025] The stage (1) is provided with a blade clamp for clamping the blade (4) to be repaired, and the stage (1) is driven by a guide motor to move in the Y direction and the X direction through a Y-direction ball linear guide (2) and an X-direction ball linear guide (3) of the stage, and the blade (4) to be repaired moves along with the X and Y directions of the stage (1) and the plane is measured by a laser profiler (6);

[0026] The laser profiler (6) and the galvanometer laser (7) are respectively mounted on a galvanometer bracket (8), and the laser profiler (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 arranged on the frame; the laser profiler (6) and the galvanometer laser (7) are focal length adjusted by the galvanometer vertical motion guide rail;

[0027] A wire feeding head (5) is arranged above the blade (4) to be repaired, the head of the wire feeding head (5) is fixed on the cross workbench (11) through a fixing member, and the tail of the wire feeding head (5) is connected to the wire feeding machine (12);

[0028] The external control computer (13) is respectively connected to the laser profiler (6), the galvanometer laser (7), the stage Y-direction ball linear guide (2) and the stage X-direction ball linear guide (3) for receiving the leaf shape data scanned by the laser profiler (6), extracting the contour center line and generating the laser swing trajectory based on the leaf shape data, controlling the galvanometer laser (7) to scan along the desired trajectory, and controlling the stage Y-direction ball linear guide (2) and the stage X-direction ball linear guide (3) to move along the desired trajectory.

[0029] The laser water cooler (14) needs to be turned on throughout the cladding process to perform water circulation cooling on 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.

[0030] Furthermore, the carrier (1) moves along the pre-processing track with the blade (4) to be repaired fixed on the carrier (1) to complete the cladding process.

[0031] Furthermore, the installation height of the cross workbench (11) is adjustable, and the position of the wire feeding head can be fine-tuned by adjusting the height of the cross workbench to obtain a position relationship of the light wire suitable for processing.

[0032] Furthermore, a plurality of groups of cross workbench fixing threaded holes (10) are provided on the frame along the height direction, and the cross workbench (11) is installed at a suitable installation height for processing by installing the cross workbench fixing threaded holes at different positions.

[0033] The principle and characteristics of the present invention are: in the cladding process, the laser parameters and the oscillation amplitude of the galvanometer laser are changed in real time according to the law of blade width change, and the cladding speed is changed in combination with the dynamic mass balance equation of the wire-molten pool to achieve laser additive repair of variable wall thickness blades. The present invention solves the shortcomings of the commonly used overlap repair method for variable wall thickness blades, such as large processing allowance, large thermal impact, easy to cause blade failure, and the need for complex path planning. The material delivery method of wire feeding cladding has extremely high material utilization and good surface quality, meeting the high-quality repair requirements of variable wall thickness blades.

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

[0035] 1. The present invention introduces the swinging laser welding technology into the laser cladding forming, and utilizes the characteristic that the swinging laser beam can promote the spreading of the molten pool to spread the molten wire to the entire molten pool, thereby realizing the wire feeding repair of the variable wall thickness blade.

[0036] 2. The present invention overcomes the shortcomings of the traditional overlap repair method for variable wall thickness blades, such as large processing allowance, large thermal impact, which can easily lead to blade failure, and the need for complex path planning, and can achieve high-quality repair of variable wall thickness blades.

[0037] 3. The present invention studies the coupling behavior between the wire and the swinging laser, and adopts the wire feeding method to add material during the variable width cladding process. It has extremely high material utilization and good surface quality, simple process design, good process stability, and can produce certain economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It 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 It is a schematic diagram of the position relationship of a small section of light filament in the method of the first embodiment of the present invention;

[0041] Figure 4 to Figure 7 The following are several trajectory changes of the double twisted wire under different trajectory profiles of the present invention;

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

[0043] Fig. 9 is a blade profile and processing trajectory diagram of the second embodiment of the present invention;

[0044] Fig.10 It is a diagram of fitting the blade profile using different laser swing trajectories in the method of the second embodiment of the present invention;

[0045] Fig.11 This is a macroscopic morphology diagram of the blade-shaped profile cladding according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0046] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

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

[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 by swinging laser wire feeding cladding, and the specific steps are as follows:

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

[0052] S2: Fix the cut blade to be repaired on the stage through a blade fixture, and the surface to be processed 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 a laser profiler, and the complete blade profile data is compared to obtain the plane profile of the blade to be processed, and the center line of the plane profile of the blade to be processed is obtained by using the Hilditch thinning algorithm as the processing trajectory;

[0054] S4: Divide the blade profile to be processed into segments in the cladding direction, consider the width of each small segment of the blade profile to be equal, and design a corresponding kink-shaped laser swing trajectory according to the width of each small segment of the blade profile;

[0055] S5: During the entire cladding process, in order to ensure the continuous and stable transition behavior of the wire melting into the molten pool, the central intersection of each small segment of the knotted linear 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 needs to ensure that the central intersection of the kink-shaped oscillating laser coincides with the processing trajectory of the segment.

[0057] Specifically, in step S6, during the cladding process of the i-th segment blade shape, the X direction

[0058] The cladding speed is expressed as follows:

[0059]

[0060] Among them, S w is the cross-sectional area of ​​the wire, in mm 2 ;v w is the wire feeding speed, the unit is mm / s; A i is the width of the i-th segment of the leaf shape, in mm; r is the diameter of the laser spot, in mm; h is the expected single-layer cladding height, in mm;

[0061] During the entire cladding process, the cladding is carried out continuously at a variable speed to ensure that the volume of wire deposited within the unit cladding volume is the same, thus achieving single-pass equal-height cladding forming of variable wall thickness cladding layers.

[0062] S7: adjusting the end of the wire to coincide with the central intersection of the kink-shaped 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 blade section;

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

[0065] S10: According to the height of the cladding layer, the height of the galvanometer laser and the position of the wire feeding head are adjusted, and S4 to S9 are repeated to perform the next layer of cladding until the repair is completed.

[0066] Specifically, the kink-shaped laser oscillation frequency of the galvanometer laser is 200-500 Hz, the width variation range of the laser oscillation track is 1-8 mm, the laser spot diameter is 0.6 mm, and the laser power is 600-900 W.

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

[0068] Example 2

[0069] like Fig. 9 and Fig.10 As shown in the figure, a simplified processing method for a special case is shown. If there is a straight line segment that can run through the contour of the blade with unequal width, the processing trajectory does not have to be limited to the center line. The unequal width cladding can be completed by selecting the straight line segment as the processing trajectory. The unequal width single-pass cladding result is shown in Fig.11 shown.

[0070] As a simplified processing method under special circumstances, the specific implementation steps refer to Example 1, and there is no need to perform step S3 in Example 1 to extract the contour and use the thinning algorithm to obtain the blade skeleton. It is only necessary to use any straight line that runs through the blade as the processing trajectory, and the remaining S1~S2, S4~S10 implementation methods are the same as in Example 1.

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

[0072] Example 3

[0073] refer to Figure 1 The present invention provides a device for repairing the tip of a blade with variable wall thickness by oscillating laser wire feeding cladding, comprising a frame, a stage 1 installed on the frame, a ball linear guide rail 2 in the Y direction of the stage, a ball linear guide rail 3 in the X direction of the stage, a wire feeding head 5, a laser profiler 6, a galvanometer laser 7, a galvanometer vertical motion guide rail 9, a cross workbench 11, a wire feeding machine 12, an external control computer 13 and a laser water cooler 14; wherein:

[0074] The stage 1 is provided with a blade fixture for clamping the blade 4 to be repaired, and the stage 1 is driven by the guide motor to move in the Y direction and the X direction through the stage Y direction ball linear guide 2 and the stage X direction ball linear guide 3, and the blade 4 to be repaired moves along with the stage 1 in the X and Y directions and the plane is measured by the laser profiler 6;

[0075] The laser profiler 6 and the galvanometer laser 7 are respectively mounted on a galvanometer bracket 8, and the laser profiler 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 arranged on the frame; the laser profiler 6 and the galvanometer laser 7 are focally adjusted through the galvanometer vertical motion guide rail;

[0076] A wire feeding head 5 is arranged above the blade to be repaired 4, the head of the wire feeding head 5 is fixed on the cross workbench 11 through a fixing member, and the tail of the wire feeding head 5 is connected to the wire feeding machine 12;

[0077] The external control computer 13 is respectively controlled and connected with the laser profiler 6, the galvanometer laser 7, the stage Y-direction ball linear guide 2 and the stage X-direction ball linear guide 3, so as to receive the leaf shape data scanned by the laser profiler 6, extract the contour center line and generate the laser swing trajectory based on the leaf shape data, control the galvanometer laser 7 to scan along the desired trajectory, and control the stage Y-direction ball linear guide 2 and the stage X-direction ball linear guide 3 to move along the desired trajectory.

[0078] The laser water chiller 14 needs to be turned on throughout the cladding process to perform water circulation cooling on 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 stage 1 moves along the pre-processing track with the blade 4 to be repaired fixed on the stage 1 to complete the cladding process.

[0080] Specifically, the installation height of the cross workbench 11 is adjustable, and the position of the wire feeding head is fine-tuned by adjusting the height of the cross workbench to obtain a position relationship of the light wire suitable for processing.

[0081] Specifically, a plurality of groups of cross workbench fixing threaded holes 10 are provided on the frame along the height direction, and the cross workbench 11 is installed at the cross workbench fixing threaded holes at different positions to obtain an installation height suitable for processing.

[0082] The principle and characteristics of the present invention are: in the cladding process, the laser parameters and the oscillation amplitude of the galvanometer laser are changed in real time according to the law of blade width change, and the cladding speed is changed in combination with the dynamic mass balance equation of the wire-molten pool to achieve laser additive repair of variable wall thickness blades. The present invention solves the shortcomings of the commonly used overlap repair method for variable wall thickness blades, such as large processing allowance, large thermal impact, easy to cause blade failure, and the need for complex path planning. The material delivery method of wire feeding cladding has extremely high material utilization and good surface quality, meeting the high-quality repair requirements of variable wall thickness blades.

[0083] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0088] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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 by swinging laser wire feeding cladding, characterized in that: The specific steps are as follows: S1: Remove material from the blade according to the damage of the blade to obtain a smooth surface to be processed; S2: Fix the cut blade to be repaired on the stage through a blade fixture, and the surface to be processed 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 a laser profiler, and the complete blade profile data is compared to obtain the plane profile of the blade to be processed, and the center line of the plane profile of the blade to be processed is obtained by using the Hilditch thinning algorithm as the processing trajectory; S4: Divide the blade profile to be processed into segments in the cladding direction, consider the width of each small segment of the blade profile to be equal, and design a corresponding kink-shaped laser swing trajectory according to the width of each small segment of the blade profile; S5: During the entire cladding process, in order to ensure the continuous and stable transition behavior of the wire melting into the molten pool, the central intersection of each small segment of the knotted linear 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 needs to ensure that the central intersection of the kink-shaped oscillating laser coincides with the processing trajectory of the segment. S7: adjusting the end of the wire to coincide with the central intersection of the kink-shaped 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 blade section; S9: The galvanometer laser generates laser to swing along a preset trajectory at a fixed point. The blade to be repaired moves along the processing trajectory driven by the stage. The wire feeder feeds the wire at a fixed wire feeding speed until the entire cladding process is completed. S10: According to the height of the cladding layer, the height of the galvanometer laser and the position of the wire feeding head are adjusted, and S4 to S9 are repeated 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 by swinging laser wire feeding cladding according to claim 1 is characterized in that: In step S6, during the i-th segment blade-shaped cladding process, the cladding speed in the X direction is expressed as follows: Among them, S w is the cross-sectional area of ​​the wire, in mm 2 ;v w is the wire feeding speed, the unit is mm / s; A i is the width of the i-th segment leaf shape, in mm; r is the laser spot diameter, in mm; h is the expected single-layer cladding height, in mm; During the entire cladding process, the cladding is carried out continuously at a variable speed to ensure that the volume of wire deposited within the 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 blade tips with variable wall thickness by swinging laser wire feeding cladding according to claim 1 or 2, characterized in that: The kink-shaped laser oscillation frequency of the galvanometer laser is 200-500 Hz, the width variation range of the laser oscillation track is 1-8 mm, the laser spot diameter is 0.6 mm, and the laser power is 600-900 W.

4. A method for repairing blade tips with variable wall thickness by swinging laser wire feeding cladding according to claim 1 or 2, characterized in that: The wire feeding speed of the wire feeder varies in the range of 3.5 to 5.0 mm / s.

5. A device for repairing the tip of a blade with variable wall thickness by swinging laser wire feeding cladding, comprising a frame, characterized in that: It also includes a stage (1) installed on a frame, a ball linear guide rail (2) in the Y direction of the stage, a ball linear guide rail (3) in the X direction of the stage, a wire feeder (5), a laser profiler (6), a galvanometer laser (7), a galvanometer vertical motion guide rail (9), a cross table (11), a wire feeder (12), an external control computer (13) and a laser water cooler (14); wherein: The stage (1) is provided with a blade clamp for clamping the blade (4) to be repaired, and the stage (1) is driven by a guide motor to move in the Y direction and the X direction through a Y-direction ball linear guide (2) and an X-direction ball linear guide (3) of the stage, and the blade (4) to be repaired moves along with the X and Y directions of the stage (1) and the plane is measured by a laser profiler (6); The laser profiler (6) and the galvanometer laser (7) are respectively mounted on a galvanometer bracket (8), and the laser profiler (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 arranged on the frame; the laser profiler (6) and the galvanometer laser (7) are focal length adjusted by the galvanometer vertical motion guide rail; A wire feeding head (5) is arranged above the blade (4) to be repaired, the head of the wire feeding head (5) is fixed on the cross workbench (11) through a fixing member, and the tail of the wire feeding head (5) is connected to the wire feeding machine (12); The external control computer (13) is respectively connected to the laser profiler (6), the galvanometer laser (7), the stage Y-direction ball linear guide (2) and the stage X-direction ball linear guide (3) for receiving the leaf shape data scanned by the laser profiler (6), extracting the contour center line and generating the laser swing trajectory based on the leaf shape data, controlling the galvanometer laser (7) to scan along the desired trajectory, and controlling the stage Y-direction ball linear guide (2) and the stage X-direction ball linear guide (3) to move along the desired trajectory. The laser water cooler (14) needs to be turned on throughout the cladding process to perform water circulation cooling on 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.

6. The device for repairing blade tips of variable-thickness blades by oscillating laser wire feeding cladding according to claim 5 is characterized in that: The carrier (1) moves along a pre-processing track with the blade (4) to be repaired fixed on the carrier (1) to complete the cladding process.

7. The device for repairing blade tips of variable-thickness blades by oscillating laser wire feeding cladding according to claim 5 is characterized in that: The installation height of the cross workbench (11) is adjustable, and the position of the wire feeding head is fine-tuned by adjusting the height of the cross workbench to obtain a position relationship of the light wire suitable for processing.

8. The device for repairing blade tips of variable-thickness blades by oscillating laser wire feeding cladding according to claim 7 is characterized in that: A plurality of groups of cross workbench fixing threaded holes (10) are provided on the frame along the height direction, and the cross workbench (11) obtains an installation height suitable for processing by installing the cross workbench fixing threaded holes at different positions.

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