Structural design method of blisk profile electrolytic machining auxiliary anode

Abstract

The invention discloses a structural design method of an auxiliary anode for blisk profile electrolytic machining, and belongs to the technical field of blisk machining, and the structural design method comprises the steps that structural parameters of the inner surface of the auxiliary anode are obtained according to known structural parameters of a cathode and an insulation blocking layer; moving the bladed disc workpiece for multiple times in the Z-axis direction of exiting from the cathode machining area until the bladed disc workpiece completely exits from the machining area, representing a multi-axis parameter combination of feeding motion of a machine tool as particles during each movement, and searching an optimal multi-axis parameter combination through an improved particle swarm optimization algorithm; the optimal multi-axis parameter combination corresponding to all times of movement of the blade disc workpiece in the Z-axis direction forms an optimal cathode feeding path; and based on the optimal cathode feeding path, obtaining structure parameters of the outer surface of the auxiliary anode. The method can effectively solve the problems of difficult design of auxiliary anode and cathode feeding paths and low efficiency of precise electrochemical machining caused by distortion and narrowness of inter-blade channels of blisk of small and medium-sized aero-engines.

Description

Technical Field

[0001] The invention belongs to the technical field of integral blade disk processing, and in particular relates to a structural design method for an auxiliary anode for electrolytic processing of an integral blade disk profile. Background Art

[0002] The integrated blade disk adopts an integrated design and has been widely used in modern aircraft engines. Electrolytic machining is based on the principle of electrochemical dissolution of anode metal materials to achieve material processing. It has the characteristics of no cathode loss, high production efficiency, no restrictions on material mechanical properties, and good processing quality. It is widely used in the field of integrated blade disk manufacturing.

[0003] Stray corrosion is one of the important factors affecting the precision of electrolytic machining of blade disks. Compared with traditional insulation protection, the use of sacrificial auxiliary anodes can more effectively inhibit its occurrence. However, for small and medium-sized aircraft engine integral blade disks, since the inter-blade channels are more twisted and narrow, the cathode assembly is prone to interfere with the blade disk workpiece when entering the machining position, and the structural design of the auxiliary anode is also more challenging, which restricts the application of sacrificial auxiliary anodes to inhibit stray corrosion. Therefore, in order to improve the stray corrosion inhibition effect of electrolytic finishing of small and medium-sized aircraft engine integral blade disks, a new structural design method for auxiliary anodes for electrolytic machining of integral blade disk profiles is provided, which can effectively solve the problem of difficulty and low efficiency in the design of auxiliary anode and cathode feed paths for electrolytic machining of small and medium-sized aircraft engine integral blade disks due to the twisted and narrow inter-blade channels. Summary of the invention

[0004] The purpose of the present invention is to provide a structural design method for an auxiliary anode for electrolytic machining of an integral blade disk profile, which can solve the problem of difficulty and low efficiency in designing auxiliary anode and cathode feed paths for precision electrolytic machining caused by twisted and narrow inter-blade channels of integral blade disks of small and medium-sized aircraft engines.

[0005] The present invention provides the following technical solutions:

[0006] A structural design method for an auxiliary anode for electrolytic machining of an integral blade disk profile, wherein the auxiliary anode is arranged on a surface of a cathode away from a blade to be machined, and an insulating blocking layer is arranged between the cathode and the auxiliary anode; a machine tool drives the blade disk, the cathode and the auxiliary anode to move, thereby realizing electrolytic machining of the blade to be machined of the blade disk, and the structural design method for the auxiliary anode comprises the following steps:

[0007] According to the known structural parameters of the cathode and the insulating blocking layer, the structural parameters of the inner surface of the auxiliary anode are obtained;

[0008] The blade disk workpiece moves multiple times along the Z-axis direction of the cathode machining area until it completely exits the machining area. During each movement, the multi-axis parameter combination of the machine tool feed motion is represented as particles. The optimal multi-axis parameter combination is found through the improved particle swarm optimization algorithm, and the feed motion of the machine tool is controlled according to the obtained multi-axis parameter combination.

[0009] The optimal multi-axis parameter combination corresponding to all the sub-movements of the blade disk workpiece along the Z-axis direction forms the optimal cathode feed path;

[0010] Based on the optimal cathode feeding path, the structural parameters of the outer surface of the auxiliary anode are obtained to achieve the overall structural design of the auxiliary anode.

[0011] Optionally, the inner surface of the auxiliary anode is completely consistent in shape and size with the outer surface of the adjacent insulating blocking layer.

[0012] Optionally, the multi-axis parameter combination is Δy, Δx 1 and Δx 2 ; the Δy and are the moving distance of the blade disk workpiece along the Y axis of the machine tool and the rotation angle around the C axis of the machine tool respectively; the Δx 1 is the moving distance of the blade basin cathode along the X-axis of the machine tool, and the Δx 2 It is the moving distance of the cathode on the back of the blade along the X-axis of the machine tool.

[0013] Optionally, at each movement, the multi-axis parameter combination of the machine tool feed motion is represented as particles, and the optimal multi-axis parameter combination is found by using an improved particle swarm optimization algorithm, including:

[0014] According to the single moving distance Δz of the blade disk workpiece along the Z axis, the search range of the particle swarm is determined;

[0015] Randomly initialize the particle swarm within the search range;

[0016] According to the designed objective function, the particle swarm optimization algorithm with linear decreasing inertia weight is used to update the multi-axis parameter combination of the machine tool, and iterates continuously until the optimal multi-axis parameter combination for the current move is found.

[0017] Optionally, the search range of the particle swarm is the search range of the axes of the machine tool except the Z axis; the search range of the axes of the machine tool except the Z axis is RΔz, where R is any real number between 2 and 3.

[0018] Optionally, the objective function L best for:

[0019] L best =max{L 1 …L n}

[0020] L n =min{L A1 ,L A2}

[0021] Among them, L n is the minimum distance from the adjacent blade of the blade to be processed of the nth particle in the particle group to the inner surface of the auxiliary anode; L A1 L is the minimum distance between the inner surface of the auxiliary anode of the blade basin and the adjacent blade. A2 It is the minimum distance between the inner surface of the auxiliary anode on the back of the blade and the adjacent blade.

[0022] The particle swarm optimization algorithm formula with linearly decreasing inertia weight is:

[0023] υ i (t+1)=ωυ i (t)+c 1 r 1 (P best,i -Pos i (t))+c 2 r 2 (G best -Pos i (t))

[0024] Pos i (t+1)=Pos i (t)+υ i (t+1)

[0025] ω=ω max -t(ω max -ω min ) / T max

[0026] Among them, i (t+1) and Pos i (t+1) respectively represent the velocity and position of the i-th particle at the t+1-th iteration; υ i (t) and Pos i (t) are the velocity and position of the ith particle at the tth iteration, P best,i and G best are the individual optimal solution of the particle and the global optimal solution of the population determined by the objective function; c 1 and r 1 are the learning factor and random number of the individual optimal solution, c 2 and r 2 are the learning factor and random number of the optimal solution of the population, respectively; ω is the inertia weight, ω max and ω minare the maximum and minimum values ​​of the inertia weight, T max is the maximum number of iterations of the algorithm.

[0027] Optionally, the single movement distance Δz of the blade disk workpiece along the Z-axis direction is determined by equally dividing the distance based on a known blade depth and a set number of feeding times of the blade disk workpiece in the Z-axis.

[0028] Optionally, obtaining the structural parameters of the outer surface of the auxiliary anode based on the optimal cathode feeding path specifically includes:

[0029] When the workpiece, the cathode and the auxiliary anode are in an initial electrochemical machining position, determining initial structural parameters of the outer surface of the auxiliary anode based on structural parameters of adjacent blades adjacent to the auxiliary anode;

[0030] By using each optimal multi-axis parameter combination of the optimal cathode feed path, the machine tool drives the workpiece, cathode and auxiliary anode to move simultaneously for multiple times. During each simultaneous movement, the initial structural parameters of the outer surface of the auxiliary anode and the interference part of the adjacent blades are removed to obtain the limit structural parameters of the outer surface of the auxiliary anode.

[0031] According to the designed assembly structure, the limit structural parameters of the outer surface of the auxiliary anode are modified to obtain the final structural parameters of the outer surface of the auxiliary anode.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The structural design method of the present invention can effectively solve the problem of difficult and inefficient design of auxiliary anode and cathode feed paths in precision electrolytic machining of small and medium-sized aircraft engine integral blades due to the twisted and narrow inter-blade channels of the integral blade disks. By improving the particle swarm optimization algorithm and optimizing the multi-axis parameter combination of the machine tool, the maximum design of the minimum thickness of the auxiliary anode is achieved on the basis of the cathode feed path design, which effectively improves the ultimate service life of the auxiliary anode and lays a technical foundation for high-efficiency, low-cost and high-precision machining of small and medium-sized aircraft engine integral blade disks. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of the structural design method of the auxiliary anode for electrolytic machining of the integral blade disk profile of the present invention.

[0035] Figure 2 It is a schematic diagram of the design of the cathode feed path of the present invention.

[0036] Figure 3 It is a schematic diagram of the shape design process of the outer surface of the auxiliary anode of the present invention.

[0037] Marked in the figure are: 1 is the blade disk workpiece, 2 is the adjacent blade, 3 is the blade to be processed, 4 is the blade back cathode, 5 is the blade back insulating blocking layer, 6 is the blade back auxiliary anode, 61 is the blade back auxiliary anode inner surface, 62 is the blade back auxiliary anode outer surface, 7 is the blade basin cathode, 8 is the blade basin insulating blocking layer, 9 is the blade basin auxiliary anode, and 10 is the assembly structure. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail with reference to the accompanying drawings.

[0039] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. cited in the invention are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a method comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units inherent to these methods that are not clearly listed.

[0041] like Figure 1 and 2 As shown, a method for structural design of an auxiliary anode for electrochemical machining of an integral blade disk profile is provided, comprising steps S1 to S4.

[0042] like Figure 2 As shown, the auxiliary anode of the present invention is arranged on the surface of the cathode away from the blade 3 to be processed, and an insulating blocking layer is arranged between the cathode and the auxiliary anode. The connection form between the insulating blocking layer and the cathode refers to the prior art; specifically, there are two auxiliary anodes, namely the blade back auxiliary anode 6 and the blade basin auxiliary anode 9, the blade back auxiliary anode 6 is located on the outer surface of the blade back cathode 4 and the blade back insulating blocking layer 5, the inner surface 61 of the blade back auxiliary anode is close to the outer surface of the back insulating blocking layer 5, the outer surface 62 of the blade back auxiliary anode is adjacent to the adjacent blade 2, the blade basin auxiliary anode 9 is located on the outer surface of the blade basin cathode 7 and the blade basin insulating blocking layer 8, and the inner surface of the blade basin auxiliary anode 9 is close to the outer surface of the blade basin insulating blocking layer 8; the machine tool realizes the electrolytic processing of the blade 3 to be processed by driving the blade disk, the cathode and the auxiliary anode to move.

[0043] Specifically, S1: according to the known structural parameters of the cathode and the insulating blocking layer, the structural parameters of the inner surface of the auxiliary anode are obtained.

[0044] The inner surface of the auxiliary anode is completely consistent with the outer surface of the adjacent insulating blocking layer in shape and size, that is, the inner surface of the auxiliary anode is installed in a close-fitting manner on the outer surface of the insulating blocking layer. The structural parameters of the inner surface of the auxiliary anode include the geometric dimensions, curvature characteristics and shape of the inner surface, and the structural parameters of the cathode and the insulating blocking layer include the geometric dimensions, curvature characteristics and shape of the outer surface.

[0045] S2: The blade disk workpiece 1 moves multiple times along the Z-axis direction of exiting the cathode processing area until it completely exits the processing area. During each movement, the multi-axis parameter combination of the machine tool feed motion is represented as particles, and the optimal multi-axis parameter combination is found through the improved particle swarm optimization algorithm, and the feed motion of the machine tool is controlled according to the obtained multi-axis parameter combination.

[0046] The multi-axis parameter combination is Δy, Δx 1 and Δx 2 ; Δy sum are the moving distance of the blade disk workpiece 1 along the Y axis of the machine tool and the rotation angle around the C axis of the machine tool; Δx 1 is the moving distance of the blade basin cathode 7 along the X-axis of the machine tool, and the Δx 2 It is the moving distance of the blade back cathode 4 along the X-axis of the machine tool.

[0047] When the blade disk workpiece 1 moves along the Z-axis direction, an optimal multi-axis parameter combination is obtained each time it moves until the blade disk workpiece 1 is completely moved out of the cathode processing area; after finding an optimal multi-axis parameter combination, the blade disk workpiece 1, the blade basin cathode 7 and the blade back cathode 4 all move according to the optimal multi-axis parameter combination.

[0048] In step S2, each time the machine tool moves, the multi-axis parameter combination of the feed motion is represented as a particle, and the optimal multi-axis parameter combination is found by the improved particle swarm optimization algorithm, which specifically includes the following sub-steps:

[0049] S21: Determine the search range of the particle swarm according to the single movement distance Δz of the blade disk workpiece 1 along the Z-axis direction.

[0050] The single movement distance Δz of the blade disk workpiece 1 along the Z-axis direction is determined by equally dividing the known blade depth and the set number of feed times of the blade disk workpiece in the Z-axis. The blade depth is the feed space of the blade disk workpiece 1 along the Z-axis direction; the smaller the single movement distance Δz is, the more accurate the cathode feed path finally obtained is, but the larger the single movement distance Δz is, the larger the search range of the improved particle swarm algorithm is. The single movement distance Δz can be determined based on expert experience.

[0051] To provide a specific example, the blade depth is 30 mm, the blade disk workpiece 1 is fed 15 times in the Z axis, and the single movement distance Δz of the blade disk workpiece 1 along the Z axis is 2 mm.

[0052] The search range of the particle swarm is the search range of the machine tool's axes other than the Z axis (X axis, Y axis, and C axis); the search range of the machine tool's axes other than the Z axis is RΔz, where R is any real number between 2 and 3.

[0053] To provide a specific example, if the single movement distance Δz of the blade disk workpiece 1 along the Z-axis direction is 2 mm, the search range on the X-axis is 4 mm, the search range on the Y-axis is 4 mm, and the search range on the C-axis is 4°.

[0054] S22: Randomly initialize the particle swarm within the search range.

[0055] Specifically, the size of the particle swarm is initialized, that is, the number of particles; the speed and position of each particle are randomly initialized; the inertia weight is initialized, and the maximum number of iterations is set; each particle represents a multi-axis parameter combination (Δy, Δx 1 and Δx 2 ).

[0056] S23: According to the designed objective function, the particle swarm optimization algorithm with linearly decreasing inertia weight is used to update the multi-axis parameter combination of the machine tool, and iterate continuously until the optimal multi-axis parameter combination for the current movement is found.

[0057] Objective function L best for:

[0058] L best =max{L 1 …L n}

[0059] L n =min{L A1 ,L A2}

[0060] Among them, L n is the minimum distance from the adjacent blade 2 of the blade 3 to be processed of the nth particle in the particle group to the inner surface of the auxiliary anode; L A1 L is the minimum distance between the inner surface of the auxiliary anode of the blade basin and the adjacent blade. A2 It is the minimum distance between the inner surface of the auxiliary anode on the back of the blade and the adjacent blade.

[0061] In solving the particle swarm, the minimum distance L between the adjacent blade 2 of the blade 3 to be processed and the inner surface of the auxiliary anode is calculated. nThe minimum distance L between the adjacent blade 2 of the current blade 3 to be processed and the inner surface of the auxiliary anode of the nth particle in the particle group is solved under the premise that the blade 3 to be processed does not interfere with the cathode assembly and a certain safety distance is left. n The method is to calculate and obtain it through the three-dimensional modeling software of the prior art.

[0062] The particle swarm optimization algorithm formula with linear decreasing inertia weight is:

[0063] υ i (t+1)=ωυ i (t)+c 1 r 1 (P best,i -Pos i (t))+c 2 r 2 (G best -Pos i (t))

[0064] Pos i (t+1)=Pos i (t)+υ i (t+1)

[0065] ω=ω max -t(ω max -ω min ) / T max

[0066] Among them, i (t+1) and Pos i (t+1) respectively represent the velocity and position of the i-th particle at the t+1-th iteration; υ i (t) and Pos i (t) are the velocity and position of the ith particle at the tth iteration, P best,i and G best are the individual optimal solution of the particle and the global optimal solution of the population determined by the objective function; c 1 and r 1 are the learning factor and random number of the individual optimal solution, c 2 and r 2 are the learning factor and random number of the optimal solution of the population, respectively; ω is the inertia weight, ω max and ω min are the maximum and minimum values ​​of the inertia weight, t is the current iteration number, T max is the maximum number of iterations of the algorithm.

[0067] The dynamic adjustment of inertia weight adopted in the present invention has a more sophisticated search capability than the ordinary particle swarm algorithm. maxThe value of is generally 0.9, ω min The value of is generally 0.4; r 1 and r 2 All are random numbers between 0 and 1.

[0068] Each time the blade disk workpiece 1 moves along the Z-axis direction, the multi-axis parameter combination that satisfies the objective function or reaches the maximum convergence number is the optimal multi-axis parameter combination.

[0069] S3: The optimal multi-axis parameter combination corresponding to all the movements of the blade disk workpiece 1 along the Z-axis direction forms the optimal cathode feed path.

[0070] Specifically, the optimal cathode feed path is determined by a combination of machine tool multi-axis parameters obtained by maximizing the minimum distance from adjacent blades to the inner surface of the auxiliary anode or achieving the maximum number of convergences.

[0071] According to the objective function, the improved particle swarm optimization algorithm with linear decreasing inertia weight (LDIW) formula is used to update the multi-axis parameter combination of the machine tool in the 3D modeling software. After continuous iteration, the optimal cathode feed path under the Z-axis feed distance is obtained, and the inner surface of the blade disk workpiece 1, the cathode and the auxiliary anode are moved according to the preferred multi-axis parameter combination of the machine tool.

[0072] like Figure 2 As shown, Figure 2 (a) is a structural diagram of the inner surface of the blade disk workpiece 1, the cathode, the insulating blocking layer and the auxiliary anode in the initial electrolytic machining position. Figure 2 (b) is a schematic diagram of the position structure of the blade disk workpiece 1, the cathode and the auxiliary anode after the blade disk workpiece 1 moves Δz along the positive direction of the Z axis (the direction of exiting the processing area). Figure 2 (c) shows that after the blade disk workpiece 1 moves a single time Δz, the blade disk workpiece 1 and the cathode are adjusted according to the multi-axis parameters (Δy, Δx 1 and Δx 2 ) is a structural diagram of the action.

[0073] S4: Based on the optimal cathode feeding path, the structural parameters of the outer surface of the auxiliary anode are obtained to achieve the overall structural design of the auxiliary anode.

[0074] like Figure 3 As shown, Figure 3 (a) is the initial structure diagram of the outer surface of the auxiliary anode. Figure 3 (b) is a schematic diagram of the structure after removing the initial structural parameters and the interference part between adjacent blades. Figure 3 (c) is a schematic diagram of the structure of surface fitting for the outer surface of the auxiliary anode after removing interference; Figure 3 (d) is a schematic diagram of the structure for correcting the limiting structural parameters of the outer surface of the auxiliary anode.

[0075] Specifically, step S4 includes the following sub-steps:

[0076] S41: When the workpiece, the cathode and the auxiliary anode are in the initial electrolytic machining position, the initial structural parameters of the outer surface of the auxiliary anode are determined based on the structural parameters of adjacent blades adjacent to the auxiliary anode.

[0077] Specifically, the initial structural parameters of the outer surface 62 of the blade back auxiliary anode are determined according to the structural parameters of the adjacent blade 2 adjacent to the blade back cathode 4, and the initial structural parameters of the outer surface of the blade basin auxiliary anode 9 are determined according to the structural parameters of the adjacent blade 2 adjacent to the blade basin cathode 7; Figure 3 As shown in (a) in the figure, the initial structural parameters of the outer surface of the auxiliary anode are designed based on the principle that the distance between the outer surface of the auxiliary anode and the adjacent blades is minimized when the workpiece, the cathode and the auxiliary anode are in the initial electrolytic machining position.

[0078] S42: Using each optimal multi-axis parameter combination of the optimal cathode feed path, the machine tool drives the workpiece, cathode and auxiliary anode to move simultaneously for multiple times. During each simultaneous movement, the initial structural parameters of the outer surface of the auxiliary anode and the interference part of the adjacent blades are removed to obtain the ultimate structural parameters of the outer surface of the auxiliary anode.

[0079] Specifically, Figure 3 As shown in (b) in the figure, according to an optimal multi-axis parameter combination, the machine tool drives the workpiece, cathode and auxiliary anode to move simultaneously on the X-axis, Y-axis, Z-axis and C-axis. At this time, the initial structural parameters of the outer surface of the auxiliary anode may interfere with the adjacent blades. The interfering part is removed to obtain the limit structural parameters of the outer surface of the auxiliary anode in this movement. It is worth noting that when removing it, the set safety distance between the outer surface of the auxiliary anode and the adjacent blades should also be removed.

[0080] More specifically, the interference portion can be removed by using existing technology or by using three-dimensional simulation software for calculation.

[0081] In this embodiment, if Figure 3 As shown in (c) in FIG. 1 , after removing the interference part, it is usually necessary to use the existing technology to perform surface fitting to obtain the limiting structural parameters of the outer surface of the auxiliary anode.

[0082] S43: According to the designed assembly structure, the limit structural parameters of the outer surface of the auxiliary anode are modified to obtain the final structural parameters of the outer surface of the auxiliary anode.

[0083] like Figure 3As shown in (d), the assembly structure 10 is usually a screw, and the assembly structure 10 is usually located at the edge and the thickness of the auxiliary anode located there is relatively high. In addition, since there are fewer sacrificed anodes at the location of the assembly structure 10, in order to facilitate installation, the thickness of the auxiliary anode at the location of the assembly structure 10 can be additionally removed as long as the overall strength requirement of the auxiliary anode can be met; of course, in some other embodiments, only the interfering portion of the assembly structure 10 and the adjacent blades can be removed.

[0084] The auxiliary anode design method of the present invention can effectively solve the problem of difficult and inefficient design of auxiliary anode and cathode feed paths in precision electrolytic machining caused by twisted and narrow inter-blade channels of integral blade disks of small and medium-sized aircraft engines, and effectively improve the service life of the auxiliary anode.

[0085] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0086] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform.

[0087] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A structural design method for an auxiliary anode for electrolytic machining of an integral blade disk profile, wherein the auxiliary anode is arranged on the surface of the cathode away from the blade to be machined, and an insulating blocking layer is arranged between the cathode and the auxiliary anode; the machine tool realizes electrolytic machining of the blade to be machined of the blade disk by driving the blade disk, the cathode and the auxiliary anode to move. It is characterized in that The following steps are involved: According to the known structural parameters of the cathode and the insulating blocking layer, the structural parameters of the inner surface of the auxiliary anode are obtained; The blade disk workpiece moves multiple times along the Z-axis direction of the cathode machining area until it completely exits the machining area. During each movement, the multi-axis parameter combination of the machine tool feed motion is represented as particles. The optimal multi-axis parameter combination is found through the improved particle swarm optimization algorithm, and the feed motion of the machine tool is controlled according to the obtained multi-axis parameter combination. The optimal multi-axis parameter combination corresponding to all the sub-movements of the blade disk workpiece along the Z-axis direction forms the optimal cathode feed path; Based on the optimal cathode feeding path, the structural parameters of the outer surface of the auxiliary anode are obtained to achieve the overall structural design of the auxiliary anode.

2. The structural design method of the auxiliary anode for electrochemical machining of the integral blade disk profile according to claim 1, It is characterized in that The inner surface of the auxiliary anode is completely consistent in shape and size with the outer surface of the adjacent insulating blocking layer.

3. The structural design method of the auxiliary anode for electrochemical machining of the integral blade surface according to claim 1, It is characterized in that The multi-axis parameter combination is Δy, Δx 1 and Δx 2 ; the Δy and are the moving distance of the blade disk workpiece along the Y axis of the machine tool and the rotation angle around the C axis of the machine tool respectively; the Δx 1 is the moving distance of the blade basin cathode along the X-axis of the machine tool, and the Δx 2 It is the moving distance of the cathode on the back of the blade along the X-axis of the machine tool.

4. The structural design method of the auxiliary anode for electrochemical machining of the integral blade surface according to claim 1, It is characterized in that At each movement, the multi-axis parameter combination of the machine tool feed motion is represented as particles, and the optimal multi-axis parameter combination is found through the improved particle swarm optimization algorithm, including: According to the single moving distance Δz of the blade disk workpiece along the Z axis, the search range of the particle swarm is determined; Randomly initialize the particle swarm within the search range; According to the designed objective function, the particle swarm optimization algorithm with linear decreasing inertia weight is used to update the multi-axis parameter combination of the machine tool, and iterates continuously until the optimal multi-axis parameter combination for the current move is found.

5. The structural design method of the auxiliary anode for electrochemical machining of the integral blade disk profile according to claim 4, It is characterized in that The single movement distance Δz of the blade disk workpiece along the Z-axis direction is determined by equally dividing the distance based on the known blade depth and the set number of feeding times of the blade disk workpiece in the Z-axis.

6. The structural design method of the auxiliary anode for electrochemical machining of the integral blade surface according to claim 4, It is characterized in that The search range of the particle swarm is the search range of the axes of the machine tool except the Z axis; the search range of the axes of the machine tool except the Z axis is RΔz, where R is any real number between 2 and 3.

7. The structural design method of the auxiliary anode for electrochemical machining of the integral blade disk profile according to claim 4, It is characterized in that The objective function L best for: L best =max{L 1 …L n } L n =min{L A1 ,L A2 } Among them, L n is the minimum distance from the adjacent blade of the blade to be processed of the nth particle in the particle group to the inner surface of the auxiliary anode; L A1 L is the minimum distance between the inner surface of the auxiliary anode of the blade basin and the adjacent blade. A2 It is the minimum distance between the inner surface of the auxiliary anode on the back of the blade and the adjacent blade. The particle swarm optimization algorithm formula with linearly decreasing inertia weight is: υ i (t+1)=ωυ i (t)+c 1 r 1 (P best,i -Pos i (t))+c 2 r 2 (G best -Pos i (t)) Pos i (t+1)=Pos i (t)+υ i (t+1) oh = oh max -t(ω max -oh min ) / T max Among them, i (t+1) and Pos i (t+1) respectively represent the velocity and position of the i-th particle at the t+1-th iteration; υ i (t) and Pos i (t) are the velocity and position of the ith particle at the tth iteration, P best,i and G best are the individual optimal solution of the particle and the global optimal solution of the population determined by the objective function; c 1 and r 1 are the learning factor and random number of the individual optimal solution, c 2 and r 2 are the learning factor and random number of the optimal solution of the population, respectively; ω is the inertia weight, ω max and ω min are the maximum and minimum values ​​of the inertia weight, T max is the maximum number of iterations of the algorithm.

8. The structural design method of the auxiliary anode for electrochemical machining of the integral blade disk profile according to claim 1, It is characterized in that The obtaining of structural parameters of the outer surface of the auxiliary anode based on the optimal cathode feeding path specifically includes: When the workpiece, the cathode and the auxiliary anode are in an initial electrochemical machining position, determining initial structural parameters of the outer surface of the auxiliary anode based on structural parameters of adjacent blades adjacent to the auxiliary anode; By using each optimal multi-axis parameter combination of the optimal cathode feed path, the machine tool drives the workpiece, cathode and auxiliary anode to move simultaneously for multiple times. During each simultaneous movement, the initial structural parameters of the outer surface of the auxiliary anode and the interference part of the adjacent blades are removed to obtain the limit structural parameters of the outer surface of the auxiliary anode. According to the designed assembly structure, the limit structural parameters of the outer surface of the auxiliary anode are modified to obtain the final structural parameters of the outer surface of the auxiliary anode.

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