Flexible braided electrode and method for electrochemical polishing of complex internal channel

Abstract

A flexible braided electrode and a method for electrochemical polishing of a complex internal channel, which belong to the technical field of electrolytic machining. The flexible braided electrode is formed by inter-braiding a plurality of flexible conductive wires and a plurality of flexible insulating wires at certain intervals, the diameter of the insulating wires is greater than that of the conductive wires, and steps of a certain height are naturally formed between the flexible conductive wires and the flexible insulating wires, such that short-circuit burning caused by contact between the conductive metal wires and internal channels can be avoided, mass transfer can be enhanced, and the removal of products can be accelerated. The flexible braided electrode is of a hollow meshed cylindrical structure, such that internal-external composite electrolytic-solution flushing can be implemented, thereby improving a flushing effect. During polishing, the flexible braided electrode can adaptively bend and deform in a bent internal channel, such that the characteristic of the inside being in communication with the outside is used to perform internal-external composite electrolytic-solution flushing, and the rotation and reciprocating motion of the electrode are combined to implement electrochemical polishing of the complex internal channel. The flexible braided electrode provided in the present application, supplemented with an innovative process method, can realize efficient and high-quality finishing of the complex internal channel.

Description

Flexible braided electrode and electrochemical polishing method for complex inner channel TECHNICAL FIELD

[0001] The present application relates to a flexible braided electrode and electrochemical polishing method for complex inner channel, belonging to the technical field of electrolytic processing. BACKGROUND

[0002] Additive manufacturing technology is a technology that forms a complete part or component by heating and melting materials point by point, line by line, and layer by layer according to the model made by computer-aided design software. This technology has high flexibility, short manufacturing cycle, and greatly reduces material waste, so it is widely used in aerospace manufacturing, medical personalized customized human implant, chemical catalysis, etc. At the same time, the flexibility and efficiency of additive manufacturing technology make it widely used in the manufacture of workpieces containing complex inner channel structures.

[0003] However, due to the problems of spheroidization effect, powder adhesion, and step effect in additive manufacturing technology, the surface of the processed parts is rough and has a large number of protruding structures, which is difficult to meet the technical requirements in the field of aerospace, etc. and needs to be finished after processing. Especially for complex inner channels, the inner channel visibility is poor and the tool operation is not convenient, making the finishing after processing more difficult. How to finish machining the workpiece with complex curved inner channel is a difficult problem that puzzles manufacturing at present.

[0004] Currently, the common polishing processes for additive manufacturing parts at home and abroad include mechanical polishing, laser polishing, abrasive flow polishing, and chemical polishing. Among these polishing technologies, mechanical polishing is the most widely used, which has significant advantages in material removal efficiency and surface quality after processing. However, mechanical polishing has many processing procedures and poor tool accessibility, which cannot effectively finish the inner channel with complex structure; in the process of laser polishing, local heating of the workpiece in a short time may cause deformation or cracking of the workpiece, and the laser beam is difficult to deal with the complex inner channel; abrasive particles may be left on the surface of the workpiece after abrasive flow polishing, and the abrasive particles in the inner channel are even more difficult to remove.

[0005] As a non-contact processing method, electrochemical polishing method is not limited by the mechanical properties of the material, mainly relying on anodic dissolution in the electrochemical reaction process to achieve material removal. This method has the advantages of strong flexibility and good processing effect, and can better realize the finishing machining of complex inner channels.

[0006] In the patent "Flexible wire electrode assembly and method for polishing inner surface of micro metal flow channel" (application number 20020010932152.0 applicant Nanjing University of Aeronautics and Astronautics, inventor Zeng Yongbin Li Yanliang Yangtao Xu Zhengyang), a flexible electrode is proposed which is made of two flexible wires spirally wound, and the diameter of the insulating flexible wire is larger than that of the conductive cathode wire, which can avoid short circuit of the conductive cathode wire on the inner wall. Compared with the above, the flexible braided electrode used in the present application has a hollow structure, can perform internal and external composite flushing, accelerate product discharge, improve polishing quality, and can adjust the cross-sectional shape of the flexible electrode according to the shape of the inner channel, so that it can complete the finishing of square, oval and other inner channels.

[0007] In the patent "Traction type flexible tool cathode and internal channel electrolytic mechanical finishing method" (application number 2001810474066.2 applicant Nanjing University of Aeronautics and Astronautics, inventor Qu Ningsong, Tuexiaokang Fangxiaolong Li Hansong), a cathode tool including a cathode bolt and a flexible friction layer is proposed, which finishes the inner wall by the combined action of electrolysis and friction. Compared with the above, the flexible braided electrode used in the present application has simple and light structure, high polishing efficiency, and can finish the machining of smaller inner channels.

[0008] In the patent "Flexible twisted cathode and electrochemical polishing method for complex inner channel" (application number 2002210578163.2 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Di An Linchao Wang Dengyong), a flexible electrode is proposed which is twisted by two metal wires and a plurality of non-conductive fine wires. The uniformly distributed non-conductive fine wires in the circumferential direction can avoid direct contact between the tool cathode and the inner channel, preventing short circuit. Compared with the above, the flexible braided electrode used in the present application has a meshed hollow structure, can perform internal and external composite flushing, and the alternating braiding method naturally forms a high step between the insulating wire and the metal conductor wire, preventing short circuit while ensuring finishing effect.

[0009] In the patent "Complex inner channel reciprocating electrolytic grinding composite machining method" (application number 20020011047082.7 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Di Wang Dengyong An Linchao), a machining method is proposed which realizes electrolytic grinding composite machining by pulling the tool assembly reciprocatingly through a hollow soft shaft, for finishing the surface of a curved complex inner channel. Compared with the above, the flexible braided electrode used in the present application has simple structure and is easy to manufacture, and can finish machining of smaller inner channel parts.

[0010] In the patent "Flexible electrode for electrochemical polishing and method of electrochemical polishing of internal cavity structure" (Application No. 2002110339643.9 Applicant China Academy of Engineering Physics Institute of Mechanical Manufacturing Technology, inventor Ye Zuohan Ye Mincheng Wang Lili Pan Jinlong Li Xiaoyuan Wang Chao Shen Xianfeng), a flexible electrode composed of an insulating layer, an electrode layer and a support layer is proposed, which can adapt to the internal cavity structure after expansion and perform electrochemical polishing. Compared with the above, the present invention adopts a high-pressure high-speed electrolyte flushing flow field mode, and controls the cathode to move reciprocally and rotate, which is more conducive to product discharge, enhances mass transfer and ensures finishing effect.

[0011] In the patent "Snakelike flexible cathode and internal channel electrochemical polishing method" (Application No. 202210578582.6 Applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Di'an Lin Chao Wang Dengyong), a snakelike flexible cathode composed of multiple cathode unit segments, ball hinge joints, cathode end covers, cathode support rings and fastening bolts is proposed. Compared with the above, the flexible woven electrode adopted by the present invention is woven from multiple small-diameter metal wires and multiple large-diameter non-metal wires according to a certain interval, which is simple in structure and easy to manufacture, and can be used for finishing machining of small-diameter internal channels.

[0012] In the patent "Additive manufacturing part internal channel electrolytic cleaning electrode device and processing method thereof" (Application No. 2002310072363.5 Applicant Shanghai Jiaotong University, inventor requests not to publish name), an electrode structure composed of a front-end conductive electrode, a front-end insulating sleeve and a rear-end flexible electrode is provided, and residual materials are removed by a rear-end brush. Compared with the above, the hollow structure of the flexible woven electrode adopted by the present invention can perform internal and external combined liquid flushing, enhance mass transfer and improve electrolytic polishing quality.

[0013] In the patent "Special-shaped micro-tube inner wall electrolytic polishing device" (Application No. 2002310330372.X Applicant Taiyuan University of Technology, inventor Liang Guoxing Bai Xuechen Hao Xinhu Liu Donggang Yang Shiqing Zhang Dongdong Lv Ming), a special-shaped micro-tube inner wall electrolytic polishing device including an electrolyte tank, a waste liquid tank and a reaction box body is designed, and the electrolytic polishing treatment of the special-shaped micro-tube inner hole is realized through the deflection fixed pulley and the driving device therein. Compared with the above, the flexible woven electrode adopted by the present invention is simple in structure, adopts internal and external combined liquid flushing mode and combines with mechanical movement for finishing, and the product can be quickly discharged with electrolyte, and the finishing effect is good.

[0014] In the patent "Suction type electrolytic machining device and method for finishing internal structure" (application number 202011451556.4 applicant Nanjing University of Aeronautics and Astronautics, inventor Tang Xiaochuan Zhao Chenhe Qu Ningsong), a suction type electrolytic machining device with tool cathode, insulation layer, clamping frame, sliding block, bolt, sealing gasket, liquid suction pipe and compression screw is designed to realize electrolytic finishing machining of the surface of the entire internal structure. Compared with the prior art, the flexible braided electrode used in the present application can be curled into a circular or elliptical or square shape according to the shape of the inner hole section, and can process the surface of a complex inner channel with a non-circular section.

[0015] As can be seen from the above, the electrochemical polishing method mainly relies on the tool cathode extending into the inner channel for electrochemical reaction. Due to the small diameter and large bending degree of the inner channel, there are problems such as difficulty in processing the bending part, inability to timely discharge the processing products, and short circuit between the tool cathode and the workpiece during actual processing. Therefore, it is a key problem to be solved at present to design a flexible tool cathode with good flexibility and simple structure, which can effectively realize electrochemical polishing of complex inner channels while avoiding short circuit and burn. SUMMARY

[0016] The present application is directed to the problem that the tool cathode cannot extend into the curved channel and the processing products cannot be discharged in time when electrochemically polishing a workpiece with a complex inner channel. A flexible braided electrode with good flexibility and simple structure is provided, which can effectively realize electrochemical polishing of complex inner channels.

[0017] Specifically, the present application provides the following scheme: a flexible braided electrode is woven into a hollow mesh structure by alternately arranging a plurality of flexible insulating wires and a plurality of flexible conductive wires; wherein the diameter of the flexible insulating wire is greater than the diameter of the flexible conductive wire, and after weaving, a step with a certain height (0.1-0.5mm) is naturally formed between them, which can not only avoid short circuit and burn caused by contact between the conductive wire and the inner channel, but also enhance mass transfer and accelerate product discharge.

[0018] In one flexible braided electrode disclosed in the embodiments of the present application, the weaving method of the flexible braided electrode is a single-strand weaving structure, i.e. a single-strand flexible insulating wire and a single-strand flexible conductive wire are interlaced to form the flexible braided electrode. The weaving method is simple and easy to manufacture.

[0019] In one flexible braided electrode disclosed in the embodiments of the present application, the braiding manner of the flexible braided electrode is a three-strand braiding structure, that is, double-strand flexible insulating wires and single-strand flexible conductive wires are staggered and braided side by side; each flexible conductive wire is adjacent to two flexible insulating wires on both sides. Each flexible conductive wire is adjacent to two flexible insulating wires on both sides, which can better cope with an inner channel with a larger bending degree and a more complex structure, avoid the problem of point contact short circuit caused by sudden change of the inner wall structure in the processing process, and be conducive to ensuring the processing stability.

[0020] In one flexible braided electrode disclosed in the embodiments of the present application, the flexible braided electrode is a positive braiding structure, that is, the braiding wire direction is taken as the curling axis. This structure is easy to manufacture an electrode with a complex cross section, and has low manufacturing difficulty.

[0021] In one flexible braided electrode disclosed in the embodiments of the present application, the flexible braided electrode is a 45° oblique braiding structure, that is, a direction with a 45° angle with the braiding wire is taken as the curling axis. This structure is uniformly stressed when bent, has good material mechanical properties, and can cope with an inner channel structure with a larger bending degree.

[0022] In one flexible braided electrode disclosed in the embodiments of the present application, the flexible insulating wires and the flexible conductive wires are alternately arranged in the warp direction and the weft direction. This method can not only ensure the rigidity of the flexible braided electrode, but also realize the deformation of the flexible braided electrode; in addition, this method can also avoid the contact between the conductive metal wires and the inner wall of the workpiece, and prevent short circuit burn.

[0023] In one flexible braided electrode disclosed in the embodiments of the present application, the cross section of the flexible braided electrode is circular, or oval, or square, which can be selected according to different processing objects, and the rigidity and flexibility are considered.

[0024] Secondly, the application also discloses the method for electrochemically polishing the complex inner channel of the flexible braided electrode, which comprises the following steps: step one: fixing the part to be machined on the worktable of a machine tool, and connecting one end of the inner channel to a liquid collecting cavity; step two: placing the flexible braided electrode in the part to be machined along the inner channel, and the flexible braided electrode is self-adaptively bent and deformed according to the shape of the inner channel; one end of the flexible braided electrode is connected to a first main shaft of the machine tool, the other end is connected to a second main shaft of the machine tool, and the main shaft of the machine tool is adjusted to the initial position for machining; step three: connecting the flexible braided electrode to the negative pole of a power supply, and connecting the part to be machined to the positive pole of the power supply; step four: starting a liquid supply system, part of the electrolyte flows into the flexible braided electrode from the inner hole of the flexible braided electrode through a liquid supply end coaxial with the main shaft of the machine tool, and flows into the machining gap between the flexible braided electrode and the surface of the inner channel of the part through the mesh gap formed between the flexible insulating wire and the flexible conductive wire; the other part of the electrolyte flows into the liquid collecting cavity, enters the machining gap along the outer wall of the flexible braided electrode, so as to form the inner-outer combined liquid flushing mode; the diameter of the flexible insulating wire is greater than that of the flexible conductive wire, so that the short-circuit burn of the flexible braided electrode conductive wire and the surface of the inner channel of the part is avoided during the machining process; step five: after the inner channel is filled with the electrolyte, the power supply is connected, the main shaft of the machine tool is controlled to move reciprocally along the axial direction and rotate around the shaft, the flexible braided electrode is driven to move reciprocally and rotate, under the combined action of the electrochemical dissolution and the mechanical movement of the flexible electrode, the electrochemical dissolution of the surface of the inner channel of the anode workpiece to be machined is realized, the protruding area of the surface of the inner channel is closer to the flexible braided electrode, and the electrochemical dissolution speed is higher, so that the flattening effect is achieved, meanwhile, the electrochemical reaction products and bubbles are quickly discharged under the combined action of the electrolyte flushing and the movement of the flexible braided electrode, so that the electrolytic polishing of the surface of the inner channel of the part is realized; step six: after a period of time, when the roughness of the surface of the inner channel of the part reaches the machining requirement, the machining is stopped.

[0025] Compared with the prior art, the flexible braided electrode and the method provided by the application have the following advantages:

[0026] 1) An innovative tool electrode structure is provided. The flexible braided electrode provided by the application is composed of a plurality of flexible insulating wires and a plurality of flexible conductive wires which are alternately arranged and woven into a hollow mesh structure; the diameter of the flexible insulating wire is greater than that of the flexible conductive wire, and after weaving, a certain height step is naturally formed between the flexible insulating wire and the flexible conductive wire, which can not only avoid the short-circuit burn of the flexible braided electrode conductive wire and the inner channel, but also can enhance the mass transfer and accelerate the product discharge.

[0027] 2) An innovative polishing process method is provided. When the flexible braided electrode is used for electrochemical polishing of the inner channel, the flexible braided electrode rotates around the shaft and moves reciprocally, and at the same time, the inner-outer combined liquid flushing mode is adopted by using the mesh structure of the flexible braided electrode, so as to enhance the mass transfer, discharge the machining products, improve the polishing efficiency and polishing quality.

[0028] 3) wide range of applications. The flexible braided electrode proposed in the present application can change the braiding method and the tightness of the braid, and be rolled into a circle, an ellipse or a square along the axis to adapt to the polishing of complex internal channels with different cross-sectional shapes such as circular holes, elliptical holes and square holes, and has a wide range of applications. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 is a schematic diagram of the cathode of the flexible braided electrode and a local enlarged schematic diagram thereof;

[0030] Fig. 2 is a schematic diagram of the electrochemical polishing of the complex internal channel of the flexible braided electrode and a local enlarged schematic diagram thereof;

[0031] Fig. 3 is a flexible braided electrode made by different braiding methods, which are single-strand right braid structure and three-strand right braid structure;

[0032] Fig. 4 is a schematic diagram of the right braid structure of the flexible braided electrode rolled along the direction of the braided wire as the axis;

[0033] Fig. 5 is a schematic diagram of the 45° oblique braid structure of the flexible braided electrode rolled along the direction of the 45° angle between the braided wire and the axis as the axis;

[0034] Fig. 6 is a flexible braided electrode with different cross-sectional shapes, which are circular, elliptical and square;

[0035] The reference numerals in the figure are as follows: 1, flexible braided electrode; 2, flexible insulating wire; 3, flexible conductive wire; 4, part to be processed; 5, first main shaft of machine tool; 6, liquid collecting cavity; 7, internal channel surface of part; 8, power supply; 9, second main shaft of machine tool. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be further described below with reference to the accompanying drawings.

[0037] As shown in Figs. 1-2, the flexible braided electrode electrochemical polishing method proposed in the embodiment, wherein Fig. 1 is a cathode of the flexible braided electrode, wherein A is a local enlarged schematic diagram of the square box. Fig. 2 is a flexible braided electrode electrochemical polishing complex internal channel processing structure, wherein A is a local enlarged schematic diagram of the square box.

[0038] The process includes the following steps:

[0039] Step one: fix the part to be processed 4 on the machine tool workbench, and connect one end of the internal channel with the liquid collecting cavity 6;

[0040] Step two: place the flexible braided electrode 1 in the part to be processed 4 along the internal channel, which is self-adaptively bent and deformed according to the shape of the internal channel; connect one end of the flexible braided electrode 1 with the first main shaft 5 of the machine tool, and connect the other end with the second main shaft 9 of the machine tool, and adjust the main shaft of the machine tool to the initial position for processing;

[0041] Step three: connect the flexible braided electrode 1 with the negative pole of the power supply 8, and connect the workpiece 4 with the positive pole of the power supply 8;

[0042] Step four: start the liquid supply system, part of the electrolyte flows into the processing gap between the flexible braided electrode 1 and the inner passage surface 7 of the workpiece through the inner hole of the flexible braided electrode 1 coaxial with the machine tool spindle 5, and through the mesh gap formed between the flexible insulating wire 2 and the flexible conductive wire 3; another part of the electrolyte flows into the liquid collecting cavity 6 and enters the processing gap along the outer wall of the flexible braided electrode 1, thereby forming an internal and external combined liquid flushing; the diameter of the flexible braided electrode insulating wire 2 is larger than that of the conductive wire 3, which avoids short circuit and burn injury caused by the contact between the flexible braided electrode conductive wire 3 and the inner passage surface 7 of the workpiece during processing;

[0043] Step five: after the inner passage is filled with electrolyte, connect the power supply 8, control the machine tool spindle 5 to perform reciprocating motion along the axial direction and rotary motion around the shaft, and drive the flexible braided electrode 1 to perform reciprocating motion and rotary motion. Under the combined action of electrochemical dissolution and mechanical motion of the flexible electrode 1, electrochemical dissolution of the inner passage surface 7 of the workpiece to be processed is realized. The raised areas of the inner passage surface 7 have a higher electrochemical dissolution rate due to their closer distance to the flexible braided electrode 1, thereby achieving the effect of flattening. At the same time, the electrochemical reaction products and bubbles are quickly discharged under the combined action of electrolyte flushing and flexible braided electrode 1 motion, thereby realizing electrolytic polishing of the inner passage surface of the workpiece;

[0044] Step six: after a period of time, when the roughness of the inner passage surface 7 of the workpiece reaches the processing requirement, stop processing.

[0045] In this embodiment, the braided net structure naturally forms a height difference (step) after braiding, and the height difference range is about 0.1-0.5mm.

[0046] As shown in FIG. 3, the flexible braided electrode in the embodiment can be made by interlacing a single insulating wire 2 and a single metal conductor wire 3, as shown in FIG. 3A; or by interlacing two parallel insulating wires 2 and a single metal conductor wire 3, as shown in FIG. 3B. In FIG. 3, (a) and (b) are partial enlarged views of the boxes.

[0047] As shown in FIGS. 4 and 5, in terms of crimping, the flexible braided electrode 1 in the embodiment can be crimped along the braided wire direction as the axis (as shown in FIG. 4A), forming a positive braiding structure as shown in FIG. 4B, wherein (a) is a partial enlarged view of the box; or crimped along a direction at an angle of 45° with the braided wire as the axis (as shown in FIG. 5A), forming a 45° oblique braiding structure as shown in FIG. 5B, wherein (a) is a partial enlarged view of the box.

[0048] As shown in FIG. 6, the cross-sectional shape of the flexible braided electrode after being rolled up in the embodiment can be determined according to the cross-sectional shape of the inner channel to be processed, so as to meet the processing requirements of inner channels with different shapes, such as a circular cross-section (as shown in A of FIG. 6), an elliptical cross-section (as shown in B of FIG. 6), a square cross-section (as shown in B of FIG. 6), etc. In FIG. 6, (a)-(c) are local enlarged schematic views at the corresponding boxes, and (d)-(f) are cross-sectional schematic views at the corresponding positions, respectively.

Claims

1. A flexible braided electrode characterized in that: a hollow net structure is braided by a plurality of flexible insulating wires (2) and a plurality of flexible conductive wires (3) arranged alternately; wherein the diameter of the flexible insulating wires (2) is larger than the diameter of the flexible conductive wires (3), and after braiding, a certain height step is naturally formed between them, which can not only avoid short circuit and burn caused by contact between the conductive wires and the inner channel, but also enhance mass transfer and accelerate product discharge.

2. The flexible woven electrode of claim 1, wherein: The braiding method of the above-mentioned flexible braided electrode (1) is single-strand braiding structure, that is, a single-strand flexible insulating wire (2) and a single-strand flexible conductive wire (3) are interlaced to form a braid.

3. The flexible woven electrode of claim 1, wherein: The braiding method of the flexible braided electrode (1) is three-strand braiding structure, that is, two-strand flexible insulating wires (2) and a single-strand flexible conductive wire (3) are interlaced side by side; each flexible conductive wire (3) is adjacent to two flexible insulating wires (2) on both sides.

4. The flexible woven electrode of claim 1, wherein: The flexible braided electrode (1) is a positive braiding structure, that is, the braiding wire direction is taken as the curling axis.

5. The flexible woven electrode of claim 1, wherein: The flexible braided electrode (1) is a 45° oblique braiding structure, that is, the curling axis is taken as the direction of 45° angle with the braiding wire.

6. The flexible woven electrode of claim 1, wherein: The above-mentioned flexible insulating wire (2) and flexible conductive wire (3) are arranged alternately in the warp direction and weft direction.

7. The flexible woven electrode of claim 1, wherein: The cross section of the above-mentioned flexible braided electrode (1) is circular, or oval, or square.

8. A method of electrochemically polishing complex inner passageways using the flexible braided electrode of claim 1, characterized in that The process comprises the following steps: Step one: fix the part to be processed (4) on the machine tool workbench, one end of the inner channel is connected with the liquid collecting cavity (6); Step two: place the flexible braided electrode (1) in the part to be processed (4) along the inner channel, which is self-adaptively bent and deformed according to the shape of the inner channel; One end of the flexible braided electrode (1) is connected with the first spindle (5) of the machine tool, and the other end is connected with the second spindle (9) of the machine tool, and the spindle of the machine tool is adjusted to the initial position of processing; Step three: connect the flexible braided electrode (1) with the negative electrode of the power supply (8), and connect the part to be processed (4) with the positive electrode of the power supply (8); Step four: start the liquid supply system, part of the electrolyte flows into the inner hole of the flexible braided electrode (1) through the liquid supply end coaxial with the spindle (5) of the machine tool, and then flows into the processing gap between the flexible braided electrode (1) and the inner channel surface (7) of the part through the net gap formed between the flexible insulating wire (2) and the flexible conductive wire (3); the other part of the electrolyte flows into the liquid collecting cavity (6) and enters the processing gap along the outer wall of the flexible braided electrode (1), thus forming an inner and outer combined liquid flushing; the diameter of the flexible braided electrode insulating wire (2) is larger than the diameter of the conductive wire (3), which avoids short circuit and burn caused by contact between the flexible braided electrode conductive wire (3) and the inner channel surface (7) of the part during processing; Step five: after the electrolyte fills the inner channel, turn on the power supply (8), control the machine tool spindle (5) to move reciprocally along the axial direction and rotate around the shaft, drive the flexible braided electrode (1) to move reciprocally and rotate, realize the electrochemical dissolution of the inner channel surface (7) of the anode workpiece to be processed under the combined action of electrochemical dissolution and mechanical movement of the flexible electrode (1), and the convex area of the inner channel surface (7) has a higher electrochemical dissolution speed due to a closer distance from the flexible braided electrode (1), thereby achieving a flattening effect, and the electrochemical reaction products and bubbles are quickly discharged under the combined action of electrolyte flushing and flexible braided electrode (1) movement, realizing electrolytic polishing of the inner channel surface of the part; Step six: after a period of time, when the roughness of the inner channel surface (7) of the part reaches the processing requirement, stop processing.

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