An electrolytic dressing method and system for an integral bladed disk

Abstract

The present invention discloses a method and system for electrolytic dressing of an integral bladed disk. The method includes: calculating the allowance difference according to the allowance distribution of the blade profiles and the blank profiles in each plane; discretizing the blade profiles and the blank profiles in each plane into point sets to obtain a blade profile point set, a blank profile point set, and an empty point set; performing simulation machining based on set machining parameters, and calculating the minimum machining distance when each point in the blank profile point set is machined to the maximum dressing allowance; when the minimum machining distance is reached, determining whether the dressing allowance reaches the allowable allowance difference and whether the machining position is greater than the machining limit position; if not, adjusting the machining parameters; if so, deriving the position of the cathode corresponding to the blade profile point set at the machining time t; determining the dressed cathode morphology based on the position of the cathode at the machining time t and performing dressing machining on the blank profile. The present invention can rapidly reduce the initial allowance difference of the blank, and at the same time, can calculate the optimal dressing machining time.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical machining, and particularly to a method and system for electrochemical finishing of an integral blisk. Background Art

[0002] An aeroengine is the "heart" of an aircraft, and its manufacturing level represents a country's comprehensive national strength. At present, the aviation industry is developing rapidly, and its performance requirements for aeroengines are also continuously climbing. Therefore, the core components of aeroengines are also continuously upgraded. The most representative one is the integral blisk. The integral blisk is one of the important components of modern new aeroengines. It upgrades the assembled structure of the rotating disk and rotor blades of the traditional blisk to an integral structure, effectively reducing the number of engine parts, reducing the weight of the engine, and improving the performance of the engine. However, the structural characteristics, precision requirements, and materials used in the integral blisk all bring many difficulties to manufacturing. At present, electrochemical machining and mechanical machining are two important machining methods for integral blisk machining. Compared with traditional mechanical machining, electrochemical machining has many advantages, such as: a wide range of metals can be processed, the cathode has no loss during the machining process, and the temperature change and acting force generated in the machining area have little impact on the machined parts. Therefore, electrochemical machining has been widely used in the production process of complex components such as aeroengine blades, integral blisks, and casings.

[0003] During the machining process of electrochemical machining of an integral blisk, its process flow can be roughly divided into two steps. The first step is the rough machining of the blade row channel, and the second step is the finish machining of the blade profile. When the blade row channel machining is completed, the blade row channel is usually very narrow, and there are obvious large-allowance areas and small-allowance areas on the blade blank, and the allowance difference between them is relatively large. In electrochemical machining, when the cathode feeds, the entire area of the anode is eroded. When the minimum allowance of the blade blank is too small, there will not be enough machining allowance to eliminate the initial allowance difference of the blade blank, and this non-uniformity will be transferred to the final blade profile, reducing the machining accuracy of the final blade profile. Due to the existence of this genetic error effect, if the allowance difference of the blade blank after rough machining of the blade row channel cannot be efficiently eliminated, it will lead to poor finish machining accuracy of the subsequent blade profile, which is not conducive to the precision manufacturing of the integral blisk. Therefore, it is of great significance to add an electrochemical finishing process between the rough machining of the blade row channel and the finish machining of the blade profile. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for electrochemical finishing of an integral blisk, which can quickly reduce the initial allowance difference of the blank, and at the same time can calculate the optimal finishing machining time to obtain the optimal allowance distribution, which is beneficial to the development of the next electrochemical finish machining process.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] A method for electrolytic dressing of an integral blisk, comprising:

[0007] Dividing the blisk model into multiple planes, and calculating the allowance difference according to the allowance distribution of the blade profile and the blank profile in each of the planes; the blisk model is constructed based on the blisk structure;

[0008] Discretizing the blade profile and the blank profile in each of the planes into point sets to obtain a blade profile point set and a blank profile point set, and constructing an empty point set;

[0009] Performing simulation machining based on set machining parameters, and calculating the minimum machining distance when machining each point in the blank profile point set to the maximum dressing allowance; the dressing allowance is within the allowable range of the allowance difference;

[0010] When machining reaches the minimum machining distance, determining whether the dressing allowance reaches the allowable allowance difference and whether the machining position is greater than the machining limit position;

[0011] If not, adjusting the machining parameters;

[0012] If so, based on the empty point set, deriving the position of the cathode corresponding to the blade profile point set at the machining time t by using the law of the interelectrode gap in the unsteady electrolytic machining process;

[0013] Determining the dressed cathode morphology based on the position of the cathode at the machining time t;

[0014] Performing dressing machining on the blank profile through the dressed cathode morphology.

[0015] Optionally, the calculation formula for the minimum machining distance when machining each point in the blank profile point set to the maximum dressing allowance is as follows:

[0016] H min = T * S f

[0017] T' = v A * T / S f

[0018] Wherein, H min is the minimum machining distance, T' is a dimensionless constant, S f is the equilibrium gap, T is the minimum machining time, and v A is the feed rate.

[0019] Optionally, after determining the dressed cathode morphology based on the position of the cathode at the machining time t, it further includes: determining the optimal dressing machining time, and performing dressing machining on the blank profile through the dressed cathode morphology according to the optimal dressing machining time.

[0020] Optionally, it specifically includes:

[0021] Using complex variable functions to solve the surface potential distribution of the blank profile in non-steady-state machining;

[0022] Establishing a normal dissolution model for the maximum surface allowance area and the minimum surface allowance area of the blank profile;

[0023] Calculating a reasonable machining time set based on the surface potential distribution and the normal dissolution model;

[0024] Selecting the machining time corresponding to the minimum removal amount at the minimum allowance of the blank profile from the reasonable machining time set as the optimal machining time.

[0025] Optionally, using complex variable functions to solve the surface potential distribution of the blank profile in non-steady-state machining specifically includes:

[0026] Extracting the minimum interelectrode gap area and the maximum interelectrode gap area between the blank profile and the cathode morphology, and performing equivalent circular arc processing to obtain an arc function;

[0027] Performing conformal transformation on the circular arc, and projecting the arc function onto the ξ plane to obtain a mapping function;

[0028] Transforming the arc function based on the mapping function;

[0029] Calculating the surface potential distribution of the blank profile based on the transformed arc function.

[0030] The present invention also provides an integral blisk electrolytic dressing system, including:

[0031] A margin difference calculation module, configured to divide the blisk model into multiple planes, and calculate the margin difference according to the margin distribution of the blade profile and the blank profile in each plane; the blisk model is constructed based on the blisk structure;

[0032] A point set determination module, configured to discretize the blade profile and the blank profile in each plane into point sets, obtain a blade profile point set and a blank profile point set, and construct an empty point set;

[0033] A minimum machining distance calculation module, configured to perform simulation machining based on set machining parameters, and calculate the minimum machining distance when each point in the blank profile point set is machined to the maximum dressing allowance; the dressing allowance is within the allowable range of the margin difference;

[0034] A judgment module, configured to judge whether the dressing allowance reaches the allowable margin difference and whether the machining position is greater than the machining limit position when machining to the minimum machining distance;

[0035] An adjustment module, configured to adjust the machining parameters when the leveling allowance does not reach the allowable allowance difference and the machining position is not greater than the machining limit position;

[0036] A position determination module, configured to, when the leveling allowance reaches the allowable allowance difference and the machining position is greater than the machining limit position, derive the position of the cathode corresponding to the blade profile points set at the machining time t by using the law of the interelectrode gap in the unsteady electrochemical machining process;

[0037] A machined cathode morphology determination module, configured to determine the machined cathode morphology based on the position of the cathode at the machining time t;

[0038] A machining module, configured to perform leveling machining on the blank profile through the machined cathode morphology.

[0039] Optionally, the calculation formula for the minimum machining distance when each point in the blank profile points set is machined to the maximum leveling allowance is as follows:

[0040] H min = T * S f

[0041] T' = v A * T / S f

[0042] Wherein, H min is the minimum machining distance, T' is a dimensionless constant, S f is the equilibrium gap, T is the minimum machining time, and v A is the feed rate.

[0043] Optionally, it further includes:

[0044] An optimal leveling machining time determination module, configured to determine the optimal leveling machining time, and perform leveling machining on the blank profile through the machined cathode morphology according to the optimal leveling machining time.

[0045] Optionally, the optimal leveling machining time determination module specifically includes:

[0046] A surface potential distribution solving unit, configured to solve the surface potential distribution of the blank profile in the unsteady machining by using complex variable functions;

[0047] A normal dissolution model establishing unit, configured to establish a normal dissolution model for the maximum surface allowance area and the minimum surface allowance area of the blank profile;

[0048] A reasonable machining time set calculating unit, configured to calculate a set of reasonable machining times based on the surface potential distribution and the normal dissolution model;

[0049] A screening unit, configured to screen out, from the set of reasonable processing times, the processing time corresponding to the minimum removal amount at the minimum allowance of the blank profile as the optimal processing time.

[0050] Optionally, the surface potential distribution solving unit specifically includes:

[0051] An arc function determining subunit, configured to extract the minimum interelectrode gap region and the maximum interelectrode gap region between the blank profile and the cathode morphology, and perform equivalent arc processing to obtain an arc function;

[0052] A projection subunit, configured to perform conformal transformation on the arc and project the arc function onto the ξ plane to obtain a mapping function;

[0053] A transformation subunit, configured to transform the arc function based on the mapping function;

[0054] A surface potential distribution calculating subunit, configured to calculate the surface potential distribution of the blank profile based on the transformed arc function.

[0055] According to the specific embodiments provided by the present invention, the following technical effects are disclosed:

[0056] Aiming at the problem of large difference in the blank allowance after electrolytic rough machining of the blades of an integral blisk, the present invention proposes an electrolytic dressing method and system for an integral blisk. By adjusting the processing parameters, the dressing allowance is made to reach the allowable allowance difference and the processing position is greater than the processing limit position, and the dressing cathode morphology is determined, so that the rough machining blank can be efficiently dressed. The present invention can also predict the best dressing processing time, directly calculate the processing time with the minimum allowance difference during the processing, shorten the test cycle, and improve the efficiency. Description of the Drawings

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0058] Figure 1 It is a flowchart of the electrolytic dressing method for an integral blisk provided by the present invention;

[0059] Figure 2 It is a detailed flowchart of the electrolytic dressing method for an integral blisk provided by the present invention;

[0060] Figure 3Schematic diagram of the intersection lines of the profiles of a certain type of blade and the blank profile with a plane; where 1-1 is the blade design model; 1-2 is the blank model after rough machining; 1-3 is the plane where the blade design section line is located.

[0061] Figure 4 Schematic diagram of the allowance distribution of the blade profile and the blank profile on the section plane.

[0062] Figure 5 The cathode morphologies on the suction side and pressure side obtained by design calculation; where Figure 5 (a) Schematic diagram of the cathode morphology for flattening on the suction side. Figure 5 (b) Schematic diagram of the cathode morphology for flattening on the pressure side. Specific implementation manners

[0063] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0064] The purpose of the present invention is to provide a method and system for electrolytic flattening of an integral blisk, which can quickly reduce the initial allowance difference of the blank, and at the same time can calculate the optimal flattening processing time to obtain the optimal allowance distribution, which is beneficial to the development of the next electrolytic finishing process.

[0065] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0066] Embodiment 1

[0067] As Figure 1-2 shown, a method for electrolytic flattening of an integral blisk provided by the present invention includes the following steps:

[0068] Step 101: Divide the blisk model into multiple planes, and calculate the allowance difference according to the allowance distribution of the blade profile and the blank profile in each of the planes; the blisk model is constructed based on the blisk structure.

[0069] In actual operation, several planes are used to intersect with the blade and the blank, and the obtained intersection lines are used as the blade profile line and the blank profile line, so as to extract the blade profile and the blank profile. As Figure 3 shown, analyze the allowance distribution of the blade profile and the blank profile in a single plane. As Figure 4 shown, calculate the allowance difference ΔS = S max -S min .

[0070] Step 102: Discretize the blade profile and the blank profile in each plane into point sets to obtain a blade profile point set and a blank profile point set, and construct an empty point set.

[0071] In actual operation, discretize the blade profile and the blank profile in the plane into point sets to obtain point sets A(x1, y1) and B(x2, y2), and establish an empty point set C(x3, y3) corresponding to the geometric control point set of the cathode morphology.

[0072] Step 103: Perform simulation machining based on the set machining parameters, and calculate the minimum machining distance when each point in the blank profile point set is machined to the maximum leveling allowance; the leveling allowance is within the allowable range of the allowance difference.

[0073] Step 104: When machining reaches the minimum machining distance, determine whether the leveling allowance reaches the allowable allowance difference and whether the machining position is greater than the machining limit position.

[0074] In actual operation, first confirm the allowable allowance difference δ and the limit machining position in the current machining. Then input the machining parameters, the initial machining gap S1, the feed rate v A and the anode voltage U R , and set the initial gap S1 = S f , where S f is the equilibrium gap. In the formula, η, ω, and κ are all physical property parameters related to the electrolyte and the workpiece material. Then calculate the minimum machining distance H min required at the maximum leveling allowance. According to Ohm's law, the derivation formula is as follows:

[0075]

[0076] Where: S' and t' are dimensionless constants, and s is the interelectrode gap at any time.

[0077] That is, as machining progresses, the gap between the cathode and the irregular blank profile surface changes from the initial gap of S1 + S max , and gradually approaches S f +δ, where S1 = S f , calculate the dimensionless minimum machining time T' = v A *T / S f :

[0078]

[0079] Solve to obtain the minimum machining distance for machining each point in the blank profile point set to the allowable range of the allowance difference as H min = T*S f .

[0080] At this time, it is judged whether the allowable margin difference can be achieved and whether the machining position is greater than the machining limit position. If not, jump to step 105; if so, jump to step 106.

[0081] Step 105: Adjust the machining parameters.

[0082] Step 106: Based on the empty point set, use the law of the interelectrode gap in the unsteady electrochemical machining process to deduce the position of the cathode corresponding to the blade contour point set at the machining time t.

[0083] The points in the point set C(x3, y3) correspond to the point set S2(x4, y4) at the start time of machining, and after the machining time t, the cathode point set comes to the position C’(x3’, y3’), and the interelectrode gap becomes S2’(x4’, y4’). According to the law of the change of the interelectrode gap in the unsteady electrochemical machining process:

[0084] S2′ = S2 + l - L

[0085] where l is the electrolysis amount (length) and L is the cathode feed amount. Differentiate this equation with respect to t:

[0086]

[0087] where, is the metal removal rate of the anode (blank) at time t:

[0088]

[0089] is the cathode feed speed, which is v here A . Rearrange the equation and write S2' as f(t), To get f(t)’:

[0090]

[0091] Finally, solve for S2” at time t and solve for the position of the cathode point C’(x3’, y3’) at this time t.

[0092] Step 107: Determine the flattened cathode morphology based on the position of the cathode at the machining time t.

[0093] Since the position of the cathode point set C’(x3’, y3’) at time t is calculated here, in order to obtain the initial cathode profile, the y coordinate value of the point set C’(x3’, y3’) needs to be shifted backward by v A *t. Thus, the initial cathode morphology C(x3, y3) is obtained, as Figure 5 shown.

[0094] Step 108: Level the blank contour based on the leveled cathode morphology.

[0095] After obtaining the leveled cathode morphologies of each plane, it is necessary to determine the optimal leveling processing time to minimize the remaining difference after processing. Since the cathodes designed through Steps 101 - 107 often have the characteristics of a small initial inter-electrode gap at large-remaining areas and a large inter-electrode gap at small-remaining areas, at a specific time t x the remaining difference will reach the minimum value, and when it is greater than t x the remaining difference will increase and the leveling effect will deteriorate instead. Therefore, it is necessary to find the critical time t x . Calculate the potential distribution between the workpiece anode and the leveling cathode according to the Laplace equation and complex variable function transformation. The Laplace equation is as follows:

[0096]

[0097] where u represents the potential at each point in the space electric field, and x and y represent the spatial coordinates (x, y).

[0098] First, extract the minimum inter-electrode gap region (the largest remaining region A) and the maximum inter-electrode gap region (the smallest remaining region B) between the blank contour and the leveled cathode morphology, and perform equivalent circular arc processing on these two parts. After processing, the equivalent circular function is satisfied as:

[0099]

[0100] Here, R, M, N, a, b, and c are all constants after equivalent circular processing. x and y represent the x and y coordinates in the rectangular coordinate system.

[0101] After obtaining the equivalent circular arcs at both ends, solve the potential distribution on the surface of the non-steady-state processing anode, perform conformal transformation on the circular arcs, and project the circular arc function onto the ξ plane. Its approximate mapping function is:

[0102]

[0103] where θ is the angle value of the angle between the coordinate in the transformed plane and the origin.

[0104] Meanwhile:

[0105]

[0106] Through the mapping transformation, the original system of equations can be transformed into:

[0107]

[0108] where d’ is the width of the transformed strip region, and u1 is the potential difference of the strip region.

[0109] The original curved boundary is transformed into a strip region formed by two infinitely long straight lines. Calculate the electric potential distribution within the strip region. According to the electric field strength calculation formula:

[0110]

[0111] At the same time, according to the characteristics of the electric field and its boundary conditions, the transformed system of equations can be solved to obtain:

[0112]

[0113] Furthermore, through the differential relationship between the electric field strength and the electric potential E = -gradU, the electric field strength expression of the original curved boundary can be obtained:

[0114]

[0115] The electric potential distributions of the two regions are obtained in the same way.

[0116] According to Ohm's law and Faraday's law, the dissolution model of the normal metal can be obtained:

[0117] v 法 = ηωκE.

[0118] Solve for the minimum value of the difference between the maximum and minimum values of the remainder, establish the corresponding function T(t) between the remainder difference and the processing time. When it is less than the allowable remainder difference δ, the processing stops. Its expression is:

[0119]

[0120] Where y A and y B are known quantities, which are the initial maximum and minimum remainders of the blank contour; i A , i B is the normal current density at the corresponding point, and T(t) can be obtained. At this time, the set of T(t) solutions obtained is all reasonable processing times.

[0121] Select the solution with the smallest removal amount at the minimum remainder from the above solution set, that is:

[0122]

[0123] Obtains the minimum value. The corresponding processing time at this time is the optimal processing time, indicating that the full profile has reached the allowable remainder difference at this moment, and the minimum remainder retains the most processing allowance, which is beneficial to the next fine machining.

[0124] Example Two

[0125] To implement the method corresponding to the first embodiment above to achieve the corresponding functions and technical effects, the following provides an integral blisk electrolytic dressing system, which includes:

[0126] A margin difference calculation module, configured to divide the blisk model into multiple planes, and calculate the margin difference according to the margin distribution of the blade profile and the blank profile in each of the planes; the blisk model is constructed based on the blisk structure;

[0127] A point set determination module, configured to discretize the blade profile and the blank profile in each of the planes into point sets, obtain a blade profile point set and a blank profile point set, and construct an empty point set;

[0128] A minimum machining distance calculation module, configured to perform simulation machining based on set machining parameters, and calculate the minimum machining distance when machining each point in the blank profile point set to the maximum dressing margin; the dressing margin is within the allowable range of the margin difference;

[0129] A judgment module, configured to judge whether the dressing margin reaches the allowable margin difference and whether the machining position is greater than the machining limit position when machining to the minimum machining distance;

[0130] An adjustment module, configured to adjust the machining parameters when the dressing margin does not reach the allowable margin difference and the machining position is not greater than the machining limit position;

[0131] A position determination module, configured to, when the dressing margin reaches the allowable margin difference and the machining position is greater than the machining limit position, derive the position of the cathode corresponding to the blade profile point set at the machining time t using the law of the interelectrode gap in the unsteady electrolytic machining process;

[0132] A dressed cathode morphology determination module, configured to determine the morphology of the dressed cathode based on the position of the cathode at the machining time t;

[0133] A machining module, configured to dress the blank profile through the morphology of the dressed cathode.

[0134] It further includes:

[0135] An optimal dressing machining time determination module, configured to determine the optimal dressing machining time, and dress the blank profile through the morphology of the dressed cathode according to the optimal dressing machining time.

[0136] Wherein, the optimal dressing machining time determination module specifically includes:

[0137] A surface potential distribution solving unit, configured to solve the surface potential distribution of the blank profile in the unsteady machining using complex variable functions;

[0138] The normal dissolution model establishment unit is used to establish the normal dissolution models of the maximum surface allowance area and the minimum surface allowance area of the blank profile;

[0139] The reasonable processing time set calculation unit is used to calculate the reasonable processing time set based on the surface electric potential distribution and the normal dissolution model;

[0140] The screening unit is used to screen out the processing time corresponding to the minimum removal amount at the minimum allowance of the blank profile from the reasonable processing time set as the optimal processing time.

[0141] Among them, the surface electric potential distribution solving unit specifically includes:

[0142] The circular arc function determination subunit is used to extract the minimum interelectrode gap area and the maximum interelectrode gap area between the blank profile and the cathode morphology, and perform equivalent circular arc processing to obtain the circular arc function;

[0143] The projection subunit is used to perform conformal transformation on the circular arc and project the circular arc function onto the ξ plane to obtain the mapping function;

[0144] The transformation subunit is used to transform the circular arc function based on the mapping function;

[0145] The surface electric potential distribution calculation subunit is used to calculate the surface electric potential distribution of the blank profile based on the transformed circular arc function.

[0146] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0147] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for electrolytic dressing of an integrally bladed disk, characterized in that, Including: Dividing the blisk model into multiple planes, and calculating the allowance difference according to the allowance distribution of the blade profile and the blank profile in each of the planes; the blisk model is constructed based on the blisk structure; Discretizing the blade profile and the blank profile in each of the planes into point sets to obtain a blade profile point set and a blank profile point set, and constructing an empty point set; Performing simulation machining based on set machining parameters, and calculating the minimum machining distance when machining each point in the blank profile point set to the maximum leveling allowance; the leveling allowance is within the allowable range of the allowance difference; When machining reaches the minimum machining distance, determining whether the leveling allowance reaches the allowable allowance difference and whether the machining position is greater than the machining limit position; If not, adjusting the machining parameters; If so, based on the empty point set, deriving the position of the cathode corresponding to the blade profile point set at machining time t by using the law of the interelectrode gap in the non-steady-state electrochemical machining process; Determining the machined cathode morphology based on the position of the cathode at machining time t; Performing leveling machining on the blank profile through the machined cathode morphology.

2. The integral blisk electrolytic dressing method according to claim 1, wherein The calculation formula for the minimum machining distance when machining each point in the blank profile point set to the maximum leveling allowance is as follows: H min = T' * S f T′ = v A *T / S f Among them, H min is the minimum machining distance, T′ is a dimensionless constant, S f is the balance gap, T is the minimum machining time, v A is the feed rate.

3. The blisk electrochemical dressing method according to claim 1, wherein After determining the machined cathode morphology based on the position of the cathode at machining time t, it further includes: determining the optimal leveling machining time, and performing leveling machining on the blank profile through the machined cathode morphology according to the optimal leveling machining time.

4. The integral blisk electrolytic dressing method according to claim 3, wherein, Determining the optimal leveling machining time specifically includes: Solving the surface potential distribution of the blank profile in the non-steady-state machining by using complex variable functions; Establishing a normal dissolution model for the surface maximum allowance region and the surface minimum allowance region of the blank profile; Calculating a reasonable machining time set based on the surface potential distribution and the normal dissolution model; Selecting the machining time corresponding to the minimum removal amount at the minimum allowance of the blank profile from the reasonable machining time set as the optimal machining time.

5. The blisk electrochemical dressing method according to claim 4, characterized in that Solving the surface potential distribution of the blank profile in the non-steady-state machining by using complex variable functions specifically includes: Extracting the minimum interelectrode gap region and the maximum interelectrode gap region between the blank profile and the cathode morphology, and performing equivalent circular arc processing to obtain an arc function; Performing conformal transformation on the arc, and projecting the arc function onto the ξ plane to obtain a mapping function; Transforming the arc function based on the mapping function; Calculating the surface potential distribution of the blank profile based on the transformed arc function.

6. An integral bladed disk electro-chemical dressing system, characterized in that, Including: An allowance difference calculation module, configured to divide the blisk model into multiple planes, and calculate the allowance difference according to the allowance distribution of the blade profile and the blank profile in each of the planes; the blisk model is constructed based on the blisk structure; A point set determination module, configured to discretize the blade profile and the blank profile in each of the planes into point sets to obtain a blade profile point set and a blank profile point set, and construct an empty point set; A minimum machining distance calculation module, configured to perform simulation machining based on set machining parameters, and calculate the minimum machining distance when machining each point in the blank profile point set to the maximum leveling allowance; the leveling allowance is within the allowable range of the allowance difference; A judgment module, configured to judge whether the flattening allowance reaches the allowable allowance difference and whether the machining position is greater than the machining limit position when machining reaches the minimum machining distance; An adjustment module, configured to adjust the machining parameters when the flattening allowance does not reach the allowable allowance difference and the machining position is not greater than the machining limit position; A position determination module, configured to, when the flattening allowance reaches the allowable allowance difference and the machining position is greater than the machining limit position, derive the position of the cathode corresponding to the blade profile points set at the machining time t by using the law of the interelectrode gap in the unsteady electrochemical machining process; A flattened cathode morphology determination module, configured to determine the flattened cathode morphology based on the position of the cathode at the machining time t; A machining module, configured to perform flattening machining on the blank profile through the flattened cathode morphology; 7. The blisk electrochemical dressing system according to claim 6, wherein, The calculation formula for machining each point in the blank profile points set to the minimum machining distance when the flattening allowance is the largest is as follows: H min = T' * S f T′ = v A *T / S f Among them, H min is the minimum machining distance, T′ is a dimensionless constant, S f is the balance gap, T is the minimum machining time, v A is the feed rate.

8. The integral blisk electrolytic dressing system according to claim 6, wherein It further includes: An optimal flattening machining time determination module, configured to determine the optimal flattening machining time, and perform flattening machining on the blank profile through the flattened cathode morphology according to the optimal flattening machining time; 9. The blisk electrochemical dressing system according to claim 8, wherein, The optimal flattening machining time determination module specifically includes: A surface potential distribution solving unit, configured to solve the surface potential distribution of the blank profile in the unsteady machining by using complex variable functions; A normal dissolution model establishing unit, configured to establish a normal dissolution model for the surface maximum allowance region and the surface minimum allowance region of the blank profile; A reasonable machining time set calculating unit, configured to calculate a set of reasonable machining times based on the surface potential distribution and the normal dissolution model; A screening unit, configured to screen out the machining time corresponding to the minimum removal amount at the minimum allowance of the blank profile from the set of reasonable machining times as the optimal machining time; 10. The blisk electrochemical dressing system according to claim 9, wherein The surface potential distribution solving unit specifically includes: An arc function determining sub-unit, configured to extract the minimum interelectrode gap region and the maximum interelectrode gap region between the blank profile and the cathode morphology, and perform equivalent arc processing to obtain an arc function; A projection sub-unit, configured to perform conformal transformation on the arc and project the arc function onto the ξ plane to obtain a mapping function; A transformation sub-unit, configured to transform the arc function based on the mapping function; A surface potential distribution calculating sub-unit, configured to calculate the surface potential distribution of the blank profile based on the transformed arc function;

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