Flexible electrode with arrayed group-slit structure and deformation control mechanism therefor, and use of flexible electrode and deformation control mechanism

Abstract

A flexible electrode, which is a hollow metal tube with a circular cross section or a rectangular cross section, wherein an equidistant group-slit structure arranged in an array is machined on the side wall of the hollow metal tube; and an electrolyte solution enters the tubular electrode through two ends thereof and flows out through the group-slit structure. A deformation control mechanism, which consists of electrode clamps (V-1), long link rods (V-4), guide rails (V-5), sliders (V-6), connecting seats (V-7) and right-angled link rods (V-8), and which has a plurality of rotation pairs and a translation pair (C). The overall structure of the deformation control mechanism is bilaterally symmetrical. The deformation control mechanism is mounted on a three-axis linkage machine tool. By means of the cooperation of the rotation pairs and the translation pair, the bending deformation of a flexible electrode is achieved. Further disclosed is the use of a flexible electrode and a deformation control mechanism in electrolytic machining. The flexible electrode has good flexibility, can deform and autonomously recover, and can be repeatedly used; in addition, the deformation control mechanism can achieve the bending of a flexible electrode with a large deformation amount.

Description

Flexible electrode with array group slit structure and its deformation control mechanism and application TECHNICAL FIELD

[0001] The present application relates to a flexible electrode with an array group slit structure and its deformation control mechanism and application, belonging to the field of electrolytic processing technology. BACKGROUND

[0002] Electrochemical machining is a non-contact special machining method based on the principle of anode electrochemical dissolution to remove materials. Compared with traditional machining methods, it has the advantages of tool wearlessness, high material removal rate, no cutting force, good surface quality, etc., and is widely used in the machining of aircraft engine parts, especially the machining of blade and disk parts, and has become one of the mainstream machining processes.

[0003] In the patent "A whole blade disk electrolytic machining method" (application number 201811128151.X applicant China Aviation Manufacturing Technology Research Institute, inventor Huang Mingtao Zhang Mingqi Cheng Xiaoyuan Fu Junying), after the tool cathode is radially fed to process the blade channel, the whole blade disk is driven to rotate clockwise and counterclockwise, and the tool cathode is approached for electrolytic finishing.

[0004] In the patent "Double-blade sleeve electrolytic machining device and machining method" (application number 202010425084.9 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Dang Zhang Xiaobo Lin Jiahao), for the whole component with large and small blades, two characteristic whole tool cathodes are designed, the tool cathode is axially fed, the double-blade rapid sleeve machining is realized, a double-flow channel flow field is designed to ensure that the two-blade machining area has sufficient electrolyte, an insulating layer is coated on the front edge end face of the cathode, and an insulating block is added at the rear edge tail to isolate the non-machining area of the cathode from the workpiece, and protect the base of the workpiece disc body and the tail edge of the blade.

[0005] In the patent "Double-face combined double-cathode and segmented control electrolytic machining method of whole blade disk" (application number 202210306217.X applicant Nanjing University of Aeronautics and Astronautics, inventor Xu Zhengyang Shen Zhenyu Liu Jia Zhu Dang), the blade full surface machining is completed in steps in the same machining cycle, without the need to design and replace the cathode and clamp separately, avoiding the disadvantages of traditional whole blade disk channel pre-machining and separate electrolytic machining of the profile finishing, improving the machining efficiency and ensuring the machining quality and precision.

[0006] In the patent "A whole blade disc blade electrolytic finishing forming device and its whole blade disc blade machining forming method" (application number 201310590896.9 applicant Yancheng Institute of Technology, inventor Wang Fuyuan Xu Jia Wen Zhao Jian She), the main electrolyte enters the flow guide area through the main flow guide gap, and the rest of the electrolyte enters the liquid supplementing cavity through the liquid supplementing guide gap, which supplements the machining gap from the upper part, and forms a stable machining flow field with the main electrolyte.

[0007] In the patent "Multi-stage blade disc multi-blade sleeve type electrolytic machining mechanism and method" (application number 202310427704.6 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Dang Wang Penghui Zhu Oi Liu Jia), the method realizes the simultaneous electrolytic machining of two-stage blades with different characteristic blades by adjusting parameters such as the inner contour of the cathode, the inner contour of the insulating water jacket, the installation position of the installation rod on the disc, the position and radial length of the radial limiting groove, etc.

[0008] Flexible electrode dynamic deformation electrolytic machining is a new method for machining complex profile parts. This method uses a simple-shaped flexible electrode as a tool cathode, and its side wall as the machining surface. While feeding in the cutting direction, the flexible electrode undergoes dynamic deformation under load, thus completing the machining of complex profiles.

[0009] In the patent "Flexible electrode dynamic deformation electrolytic machining method and application" (application number 2021126103W applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Oi Xu Zhengyang Liu Lin), complex profiles can be machined by using a simple-shaped electrode, improving the efficiency of electrolytic machining and ensuring the machining accuracy. It is also applied to the machining of whole blade disc parts.

[0010] In the patent "Flexible electrode dynamic deformation double-electrode electrolytic machining device and method" (application number 202210499138.5 applicant Nanjing University of Aeronautics and Astronautics, inventor Xu Zhengyang Liu Lin), the method adjusts the feed amount of the load application shaft according to the curvature variation characteristics of the machining profile during machining, and simultaneously utilizes the mechanism to convert the rotary motion into the translation of the electrode and composite the rotary motion of the workpiece, thus realizing the double-electrode electrolytic machining of the flexible electrode dynamic deformation.

[0011] In the patent "Flexible electrode dynamic deformation electrolytic machining device and method for multi-leaf cascade of whole component" (application number 202210497135.8 applicant Nanjing University of Aeronautics and Astronautics, inventor Xu Zhengyang Liu Lin), the method simplifies the electrode design process and adopts multi-electrode simultaneous machining, greatly improving the machining efficiency. In addition, the number and distribution position of the flexible electrodes can be adjusted according to the actual whole blade disc model to adapt to different machining requirements.

[0012] In the patent "Shape memory alloy electrode self-controllable deformation electrochemical machining method and device" (application number 202211407585.X applicant Nanjing University of Aeronautics and Astronautics, inventor Xu Zhengyang Liu Lin Zhu Oi), shape memory alloy is used as electrode material, and the initial profile line of the part is used as the electrode shape. Through heat treatment, the electrode corresponds to different part profile line shapes at different temperatures. When electrochemical machining is performed, the electrode is connected with the floating clamp, and the temperature change of the electrolyte is controlled by the equipment to make it deform at different positions. After the machining is completed, the shape memory effect of the material is used to make the electrode return to its original shape by heating.

[0013] The flexible electrode is an important carrier for flexible electrode dynamic deformation electrochemical machining, and its structural characteristics and material properties will have an important influence on the smooth progress of electrochemical machining. The present application provides a flexible electrode with an array group slit structure and a deformation mechanism. The designed flexible electrode has good flexibility, can realize deformation and autonomous recovery, and can be reused. SUMMARY

[0014] The purpose of the present application is to provide a flexible electrode with an array group slit structure that can realize deformation and autonomous recovery, and to realize flexible electrode dynamic deformation electrochemical machining by cooperating with its deformation control mechanism.

[0015] Specifically, the present application provides the following scheme: a flexible electrode with an array group slit structure, comprising: a hollow metal pipe with a circular cross-section or a square cross-section is used as a flexible electrode;

[0016] Wherein the structural parameters of the hollow metal pipe include the diameter D of the circular cross-section or the side length D of the rectangular cross-section, and the wall thickness Delta of the metal pipe; The parameter is determined according to the size of the machining part channel width and the flow of the electrolyte;

[0017] The above-mentioned hollow metal pipe is provided with an equidistant group slit structure arranged in an array on the side wall; The group slit structure is arranged in an array equidistantly on the left and right sides of the hollow metal pipe, that is, the distance between adjacent slit structures on the left side is d1, and the distance between adjacent slit structures on the right side is d1; The distance between the left slit structure and the right slit structure is d1 / 2; Wherein the slit width d2 is always less than the slit spacing d1; The control and adjustment of the flexibility and rigidity of the electrode can be realized by adjusting the structural parameters of the group slit structure, so that the flexible electrode realizes autonomous recovery and reuse after deformation, under the premise that the diameter D of the circular cross-section or the side length D of the rectangular cross-section, the wall thickness Delta of the metal pipe is unchanged, the size of the slit length l and the slit width d2 is negatively correlated with the rigidity of the electrode and positively correlated with the flexibility of the electrode; The size of the slit spacing d1 is positively correlated with the rigidity of the electrode and negatively correlated with the flexibility of the electrode;

[0018] In the electrolytic machining process, the flexible electrode is deformed by the load applied to both ends, and the electrolyte enters from both ends of the electrode, flows into the machining gap through the group slit structure, thereby completing the material removal.

[0019] Secondly, the application provides a deformation control mechanism applied to the flexible electrode, comprising:

[0020] There are two sets of deformation control mechanisms with the same structure and left-right symmetrical arrangement; it is composed of an electrode chuck (V-1), a flow guide pipe (V-2), a liquid inlet pipe (V-3), a long connecting rod (V-4), a guide rail (V-5), a sliding block (V-6), a connecting seat (V-7), and a right-angle connecting rod (V-8); one end of the long connecting rod (V-4) is connected with one end of the right-angle connecting rod (V-8) to form a Z-direction rotary pair (A), the other end of the right-angle connecting rod (V-8) is connected with the connecting seat (V-7) to form a Z-direction rotary pair (B), the connecting seat (V-7) is fixedly installed on the sliding block (V-6), and the sliding block (V-6) is connected with the guide rail (V-5) to form a Y-direction translational pair (C).

[0021] The application of the above-mentioned flexible electrode and deformation control mechanism in electrolytic machining is as follows: the flexible electrode (III) is clamped and fastened by the two electrode chucks (V-1) of the deformation control mechanism (V), the workpiece (IV) is installed on the workpiece connecting seat (II), and the workpiece connecting seat (II) is connected with the machine tool Z-axis (I-2); the two long connecting rods (V-4) of the deformation control mechanism (V) are installed on the machine tool X-axis (I-1) and the machine tool Y-axis (I-3), and the two guide rails (V-5) of the deformation control mechanism (V) are installed on the machine tool workbench (VI).

[0022] During electrolytic machining, the flexible electrode (III) is connected with the negative pole of the power supply, the workpiece (IV) is connected with the positive pole of the power supply, and the electrolyte flows into the machining area through the liquid inlet pipe (V-3); according to the curvature characteristics of the machining surface, the machine tool X-axis (I-1) and the machine tool Y-axis (I-3) drive the deformation control mechanism (V) to produce corresponding displacement, the bending deformation of the flexible electrode (III) is realized through the cooperation of the rotary pair (A), the rotary pair (B) and the translational pair (C), and the displacement of the machine tool Z-axis (I-2) is combined to drive the workpiece (IV) to move upward, thereby realizing the electrolytic machining of a complex surface.

[0023] Compared with the prior art, the scheme provided in the embodiments of the application has the following advantages:

[0024] (1) A flexible electrode with an array group slit structure is provided. A hollow metal pipe with a circular cross-section or a rectangular cross-section is used as the flexible electrode, and an array of equidistant group slit structures is machined on the side wall. The flexibility and rigidity of the electrode are adjusted and controlled by adjusting the structural parameters of the group slit structure, so that the flexible electrode can realize self-recovery and repeated use after deformation.

[0025] (2) Design a deformation control mechanism of flexible electrode. The deformation control mechanism is composed of electrode chuck, connecting rod, sliding block, guide rail and the like, has multiple rotary pairs and translational pairs, and is left-right symmetrical. The rotary pairs and translational pairs are matched to realize the bending deformation of the flexible electrode. The mechanism can realize the bending of the flexible electrode with a large deformation.

[0026] (3) The cathode is simple to manufacture, and the processing cost is reduced. The flexible electrode with an array group slit structure is used as a tool cathode, and a metal material such as an elastic alloy with a high cost does not need to be selected. Through the design of the array group slit structure, the flexibility of the ordinary metal material can be greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 is a schematic view of a flexible electrode with a group slit structure;

[0028] Fig. 2 is a schematic view of installation of each component;

[0029] Fig. 3 is a schematic view of a deformation control mechanism;

[0030] Fig. 4 is a schematic view of deformation of the deformation control mechanism;

[0031] Fig. 5 is a schematic view of a circular ring cross section and an arc cross section;

[0032] Fig. 6 is a schematic view of stress distribution;

[0033] Reference numerals in the figure: I-1, machine tool X axis, I-2, machine tool Z axis, I-3, machine tool Y axis, II, workpiece connecting seat, III, flexible electrode, IV, workpiece, V, deformation control mechanism, V-1, electrode chuck, V-2, flow guide pipe, V-3, liquid inlet pipe, V-4, long connecting rod, V-5, guide rail, V-6, sliding block, V-7, connecting seat, V-8, right-angle connecting rod, VI, machine tool workbench, A, rotary pair, B, rotary pair, C, translational pair. DETAILED DESCRIPTION

[0034] The specific implementation process of the present application will be described in detail below with reference to the accompanying drawings.

[0035] As shown in Fig. 1, a hollow metal pipe with a circular cross section or a square cross section is used as a flexible electrode;

[0036] The structural parameters of the hollow metal pipe include the diameter D of the circular cross section or the side length D of the rectangular cross section, and the wall thickness Δ of the metal pipe. The parameters are determined according to the size of the machining part channel width and the flow rate of the electrolyte.

[0037] The hollow metal pipe is provided with equidistant group slit structures arranged on the side wall; the group slit structures are equidistantly arranged on the left and right sides of the hollow metal pipe, the distance between adjacent slit structures on the left side is d1, the distance between adjacent slit structures on the right side is d1, the distance between the left slit structure and the right slit structure is d1 / 2; the slit width d2 is always less than the slit spacing d1; the control and adjustment of the flexibility and rigidity of the electrode can be realized by adjusting the structure parameters of the group slit structure, so that the flexible electrode can realize self-recovery and repeated use after deformation; under the premise that the diameter D of the circular cross section or the side length D of the rectangular cross section and the wall thickness Δ of the metal pipe remain unchanged, the size of the slit length l and the slit width d2 is negatively correlated with the rigidity of the electrode and positively correlated with the flexibility of the electrode; the size of the slit spacing d1 is positively correlated with the rigidity of the electrode and negatively correlated with the flexibility of the electrode.

[0038] In the electrolytic machining process, the flexible electrode is deformed under the load at both ends, the electrolyte enters from both ends of the electrode, flows into the machining gap through the group slit structure, and thus the material removal is completed.

[0039] As shown in FIGS. 2 and 3, the deformation control mechanism applied to the flexible electrode is characterized in that:

[0040] There are two sets of deformation control mechanisms which are the same in structure and are arranged symmetrically left and right; it is composed of an electrode clamp V-1, a flow guide pipe V-2, a liquid inlet pipe V-3, a long connecting rod V-4, a guide rail V-5, a sliding block V-6, a connecting seat V-7, and a right-angle connecting rod V-8; one end of the long connecting rod V-4 is connected with one end of the right-angle connecting rod V-8 to form a Z-direction rotary pair A, the other end of the right-angle connecting rod V-8 is connected with the connecting seat V-7 to form a Z-direction rotary pair B, the connecting seat V-7 is fixedly installed on the sliding block V-6, and the sliding block V-6 is connected with the guide rail V-5 to form a Y-direction translational pair C.

[0041] The application of the flexible electrode and the deformation control mechanism in electrolytic machining is characterized in that: the flexible electrode III is clamped and fastened by the two electrode clamps V-1 of the deformation control mechanism V, the workpiece IV is installed on the workpiece connecting seat II, and the workpiece connecting seat II is connected with the machine tool Z-axis I-2; the two long connecting rods V-4 of the deformation control mechanism V are installed on the machine tool X-axis I-1 and the machine tool Y-axis I-3, and the two guide rails V-5 of the deformation control mechanism V are installed on the machine tool workbench VI.

[0042] The process of the embodiment for realizing the dynamic deformation electrolytic machining of the flexible electrode with the group slit structure needs the following steps.

[0043] Step one: complete the installation and position alignment of the flexible electrode III, the workpiece IV, and the deformation control mechanism V;

[0044] Step two: connect the negative electrode of the power supply to the flexible electrode III, connect the positive electrode of the power supply to the workpiece, and connect the electrolyte inlet pipeline with the liquid inlet pipe of the deformation control mechanism V.

[0045] Step three: electrolyte is supplied, and the electrolytic machining power is turned on. The electrolyte flows into the machining area through the liquid inlet pipe V-3. According to the curvature characteristics of the machining profile, the machine tool X axis I-1 and the machine tool Y axis I-3 drive the deformation control mechanism V to produce corresponding displacement. The bending deformation of the flexible electrode III is realized through the cooperation of the rotary pair A, the rotary pair B and the translational pair C, as shown in FIG. 4. At the same time, the displacement of the compound machine tool Z axis I-2 is brought, and the workpiece IV is moved upward, so as to finally realize the electrolytic machining of the complex profile.

[0046] Step four: the machining is completed, the electrolytic machining power is turned off, the electrolyte supply is stopped, and the machine tool X axis I-1 and the machine tool Y axis I-3 are fed in reverse direction. The flexible electrode III is deformed back to prepare for the next machining.

[0047] In addition, the performance of the flexible electrode with the array group slit structure is described as follows:

[0048] Compared with the common circular cross-section tube electrode and the circular cross-section tube electrode with the array group slit structure, the corresponding analysis and calculation are carried out on the two electrodes by using the theory of material mechanics, so as to verify the rationality of the designed array group slit structure.

[0049] Step 1, determine the maximum stress in the bending deformation process of the flexible electrode, and the calculation process is as follows:

[0050] Step 1-1, for the two-way bending of the flexible electrode, the following assumptions are made:

[0051] (1) In the longitudinal symmetry plane of the flexible electrode, a pair of force couples with equal size and opposite direction are generated, so that the flexible electrode is purely bent.

[0052] (2) There is only normal stress on the cross section of the flexible electrode, and there is no shear stress.

[0053] (3) There is no normal stress between the longitudinal line segments of the flexible electrode.

[0054] Step 1-2, according to the above assumptions, the strain ε of any longitudinal line segment can be obtained:

[0055] Wherein, ρ is the curvature radius of the neutral layer, and y is the distance from the longitudinal line segment to the neutral layer.

[0056] Step 1-3, because there is no normal stress between the longitudinal line segments, each line segment is unidirectional stretching or compression. When the stress is less than the proportional limit, according to Hooke's law, the normal stress σ of any longitudinal line segment is:

[0057] Wherein, E is the elastic modulus of the material of the flexible electrode.

[0058] Step 1-4, the stress analysis of the cross section of the flexible electrode can be obtained, bending moment M:

[0059] Where A is the area of the cross section, I z is the moment of inertia.

[0060] Step 1-5, the above equations can be solved to obtain the bending normal stress σ of the cross section of the flexible electrode under pure bending.

[0061] Step 1-6, since it is pure bending, the bending moment M of each section is the same, so the maximum normal stress of each section should appear farthest from the neutral axis.

[0062] Step 2, determine the cross-sectional moment of inertia of the two electrodes, the calculation process is as follows:

[0063] Step 2-1, for the circular cross-section tube electrode, its cross-sectional shape is a circular ring, so its cross-sectional moment of inertia I z is:

[0064] Where R is the diameter of the outer circle, r is the diameter of the inner circle.

[0065] Step 2-2, for the circular cross-section tube electrode with array group slit structure, along the electrode axis direction, its cross-sectional shape is a circular ring and arc alternately arranged, the arc cross section can be regarded as the combination of two cross sections, the calculation process of its cross-sectional moment of inertia is as follows:

[0066] Cross section 1:

[0067] Static moment S Z1 :

[0068] Where α is the angle between cross section 1 and Z axis, H is the distance from cross section 1 to Z axis.

[0069] Cross section area A1:

[0070] So the longitudinal coordinate Y c1 of the centroid is:

[0071] In addition, the moment of inertia I Z1 of cross section 1 to Z axis is

[0072] Cross section 2:

[0073] Static moment S Z2 :

[0074] Where β is the angle between the cross section 2 and the Z axis, and H is the distance from the cross section 2 to the Z axis.

[0075] The cross section area A2:

[0076] Therefore, the ordinate Y of the centroid of the cross section 2 is c1

[0077] In addition, the moment of inertia I Z2 of the cross section 2 about the Z axis is determined as

[0078] The arc-shaped cross section:

[0079] The ordinate Y of the centroid of the arc-shaped cross section determined by the above calculation is c

[0080] The moment of inertia I Z of the combined cross section about the Z axis is determined as

[0081] By applying the parallel axis theorem, the moment of inertia I Zc of the arc-shaped cross section about the neutral axis is determined as

[0082] Step 3, determine the maximum stress distribution of the two types of electrodes, the calculation process is as follows:

[0083] Step 3-1, for the circular cross section tube electrode, each cross section along the length direction of the electrode is a circular ring shape, so during the deformation process, stress concentration may occur at each cross section, and the y max of the circular ring cross section is R. The maximum tensile stress and compressive stress of the circular ring cross section are

[0084] Step 3-2, for the tube electrode with array group slit structure, due to the existence of the array group slit structure, the arc-shaped cross section is more prone to stress concentration, and the y max of the arc-shaped cross section is R-Y c . The maximum tensile stress and compressive stress of the arc-shaped cross section are

[0085] Step 3-3, in addition, the maximum tensile stress and compressive stress of the circular ring cross section present a straight line along the length direction of the electrode, while the maximum tensile stress and compressive stress of the arc-shaped cross section present a line segment with interval distribution along the length direction of the electrode. Under the same curvature radius, the above results show that the designed array group slit structure can reduce the maximum normal stress and avoid the concentrated distribution of the maximum normal stress.

[0086] ​​In summary, the array group slit structure can reduce stress and avoid stress concentration distribution during the deformation process, so the flexible electrode with the array group slit structure has better performance.

Claims

1. A flexible electrode with an array group slit structure, characterized by: A hollow metal tube with a circular or square cross section is used as the flexible electrode; The structural parameters of the hollow metal tube include the diameter D of the circular cross section or the side length D of the rectangular cross section, and the wall thickness Δ of the metal tube. This parameter is determined based on the width of the channel of the processed part and the flow rate of the electrolyte. The hollow metal tube is processed with an array of equidistant group slit structures on its side wall; the group slit structures are arranged in an equidistant array on the left and right sides of the hollow metal tube, that is, the distance between adjacent slit structures on the left is d1, and the distance between adjacent slit structures on the right is d1; the distance between the left slit structure and the right slit structure is d1 / 2; wherein the slit width d2 is always smaller than the slit spacing d1; the control and adjustment of the flexibility and rigidity of the electrode can be achieved by adjusting the structural parameters of the group slit structure, so that the flexible electrode can achieve autonomous recovery and reuse after deformation. Under the premise that the diameter D of the circular cross section or the side length D of the rectangular cross section and the wall thickness Δ of the metal tube remain unchanged, the size of the slit length l and the slit width d2 are negatively correlated with the rigidity of the electrode and positively correlated with the flexibility of the electrode; the size of the slit spacing d1 is positively correlated with the rigidity of the electrode and negatively correlated with the flexibility of the electrode; During the electrolytic machining process, the two ends of the flexible electrode are deformed by the load, and the electrolyte enters from both ends of the electrode and flows into the machining gap through the group seam structure, thereby completing the material removal.

2. The deformation control mechanism applied to the flexible electrode according to claim 1, characterized in that: There are two sets of deformation control mechanisms with the same structure and arranged symmetrically on the left and right; they are composed of an electrode chuck (V-1), a guide tube (V-2), a liquid inlet pipe (V-3), a long connecting rod (V-4), a guide rail (V-5), a slider (V-6), a connecting seat (V-7), and a right-angle connecting rod (V-8); one end of the long connecting rod (V-4) is connected to one end of the right-angle connecting rod (V-8) to form a Z-direction rotation pair (A), the other end of the right-angle connecting rod (V-8) is connected to the connecting seat (V-7) to form a Z-direction rotation pair (B), the connecting seat (V-7) is fixedly installed on the slider (V-6), and the slider (V-6) is connected to the guide rail (V-5) to form a Y-direction translation pair (C).

3. Application of the flexible electrode and deformation control mechanism according to claim 2 in electrochemical machining, characterized in that: The flexible electrode (III) is clamped and fastened by two electrode chucks (V-1) of a deformation control mechanism (V); the workpiece (IV) is mounted on a workpiece connecting seat (II), and the workpiece connecting seat (II) is connected to a Z-axis (I-2) of a machine tool; two long connecting rods (V-4) of the deformation control mechanism (V) are mounted on an X-axis (I-1) and a Y-axis (I-3) of the machine tool; and two guide rails (V-5) of the deformation control mechanism (V) are mounted on a worktable (VI) of the machine tool. During electrolytic machining, the flexible electrode (III) is connected to the negative pole of the power supply, the workpiece (IV) is connected to the positive pole of the power supply, and the electrolyte flows into the machining area through the liquid inlet pipe (V-3); according to the curvature characteristics of the machining surface, the machine tool X-axis (I-1) and the machine tool Y-axis (I-3) drive the deformation control mechanism (V) to produce corresponding displacement, and the bending deformation of the flexible electrode (III) is achieved through the cooperation of the rotary pair (A), the rotary pair (B) and the translation pair (C). At the same time, the displacement of the composite machine tool Z-axis (I-2) drives the workpiece (IV) to move upward, ultimately achieving electrolytic machining of complex surfaces.

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