CN115780928A - Shape memory alloy electrode autonomous controllable deformation electrolytic machining method and device - Google Patents

Abstract

The invention relates to an autonomous controllable deformation electrolytic machining method and device for a shape memory alloy electrode, and belongs to the technical field of electrolytic machining. The method uses shape memory alloy as electrode material, part initial profile line as electrode shape, and makes the electrode correspond to different part profile line shapes at different temperatures by heat treatment. During electrolytic machining, the electrode is connected with the floating clamp, and the temperature of the electrolyte is regulated and controlled by equipment to generate corresponding deformation at different positions. After the processing is finished, the shape of the electrode is restored by heating the electrode by utilizing the shape memory effect of the material. The method can realize the variable cross-section processing and can reuse the electrode.

Description

Method and device for electrolytic machining of shape memory alloy electrode with independent controllable deformation

technical field

The invention relates to an electrolytic machining method and device for autonomously controllable deformation of a shape memory alloy electrode, belonging to the technical field of electrolytic machining.

Background technique

Aeroengine is one of the most complex industrial products, known as "the jewel in the crown of industrial manufacturing". As the heart of an aircraft, its manufacturing level reflects a country's technological and industrial levels to a certain extent. With the continuous improvement of aircraft performance, the performance requirements for aero-engines are getting higher and higher. The appearance of the blisk reduces the number and weight of parts, avoids the overflow pressure loss of the tenon and tenon connection, improves the aerodynamic performance, simplifies the structure of the aero-engine, enhances the reliability, and increases the thrust-to-weight ratio. After the closed integral blisk adds a whole ring of blade crowns to the edge of the blade, the flutter of the blade can be effectively suppressed, and the overall strength and stiffness of the blisk are improved. In foreign countries, the 4th generation combat aero-engine represented by F119, F120, EJ200, etc. has generally adopted the integral blisk structure. After the British R·R company's engine adopts the integral blisk structure, its weight is reduced by 50% compared with the traditional blade and wheel disc split structure; % cooling air, 100% longer lifespan, 25%-30% lighter weight.

Electrolytic machining is a machining method based on the principle of electrochemical anodic dissolution to remove materials. In electrolytic machining, the hardness of the tool material can be lower than that of the machined parts, so it is often used to process high-strength, high-hardness, high-temperature-resistant and other difficult-to-cut materials; at the same time, during the machining process, the electrolytic machining tool and the workpiece always maintain a machining gap. When there is no cutting force, it is suitable for machining precision, thin-walled and easily deformed parts with complex shapes. Due to the above-mentioned characteristics of electrolytic machining, it has been widely used in the field of aerospace and has become one of the main processing techniques for machining aero-engine parts.

In the patent "A Whole Blisk Electrolytic Grooving Processing Ring Electrode and Process Method" (application number 201210367002.5 applicant Shenyang Liming Aero Engine (Group) Co., Ltd., inventor Zhu Hainan Yang Jianshi Yu Bing Li Wei), Through the nesting electrolytic machining method, the efficient machining of the wide-chord and large-twisted blade-shaped channel slotting of the overall blisk is realized.

In the patent "Multi-electrode screw-feed integral impeller interblade flow path electrolytic machining method" (application number 200910025834.7 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Di Xu Qing Xu Zhengyang), through the multi-dimensional interpolation movement between the tool cathode and the workpiece anode , using a simple shape of tubular electrodes to process the cascade channel.

In the patent "A non-uniform double-rotation variable machining blade cathode integral blisk electrolytic machining method" (application number 201910756930.2 applicant Nanjing University of Aeronautics and Astronautics, inventor Xu Zhengyang Wang Jing Zhu Di), the design of the cathode machining blade is a variable width machining blade , drive it to rotate radially in one direction according to the simulated trajectory; drive the blank to rotate according to the parameters optimized by simulation in conjunction with the cathode in variable direction and variable speed, forming a cascade channel on the blank to improve the uniformity of the machining allowance distribution.

In the patent "A Precision Electrolytic Machining Method for Blades with Variable Sections" (Application No. 201910818869.X, the applicant is China Aviation Engine Co., Ltd., inventor Wang Fuping, Chen Wenliang, Lei Xiaojing, Hu Sijia, Li Yuanren, Jing Gang, Yang Bo, Huang Chuhuang), realized The stabilization of the precise electrolytic machining process of the variable cross-section blade surface overcomes the shortcomings of the existing CNC milling of the overall blisk blade shape with long processing cycle, low processing efficiency and high production cost.

In the patent "Double-blade nesting electrolytic processing device and its processing method" (application number 202010425084.9 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Dong Zhang Xiaobo Lin Jiahao), for the integral component with large and small blades, design two kinds of integral type features The tool cathode feeds the tool cathode along the axial direction to realize the rapid sleeve processing of double blades.

In the patent "Jig and method for nesting electrolytic machining of insoluble diffuser at blade trailing edge" (application number 201910195765.8 applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Dong Lin Jiahao Hu Xingyan Yuechen He Weifeng Song Zhangyang Chen Kaiqi Li Han Mao Yanqin), It solves the problem of excessive clamp pressure and easy leakage of electrolyte during electrolytic processing of diffuser casing, which is beneficial to improve the stability of flow field and improve the processing quality.

In the patent "Electrolytic Machining Method of Aeroengine Thin-walled Case" (application number 201410547093.X applicant Nanjing University of Aeronautics and Astronautics, inventor Zhu Di Zhu Zengwei Wang Hongrui Wang Dengyong), the anode of the workpiece rotates on its own, and the cathode of the tool advances toward the anode while moving in the circumferential direction. Yes, there is no need to replace the electrodes during the entire processing process, and the concave-convex structure on the surface of the thin-walled rotating body parts is processed and formed at one time through the electrolysis of the roller sleeve of the cathode window.

Design a new type of electrolytic machining machine tool in the patent "A High-precision Rotary Printing Electrolytic Machining Machine Tool for Machine Tool Rotation Unit and Case Parts" (application number 201810339512.9 applicant Nanjing University of Aeronautics and Astronautics, inventor Wang Dengyong Zhu Di He Bin Zhu Zengwei Li Tianzi Fang Zhongdong) , the transmission accuracy is improved, the machining current is allowed to be large, the advantages of high-efficiency electrolytic machining are fully utilized, and the application range of spin-printing electrolytic machining is expanded.

In the patent "An electrolytic machining device with shallow cavity structure on the surface of a thin-wall casing and its electrolytic machining method" (application number 202010849493.1 applicant Yangzhou University, inventor Ge Yongcheng Chen Wangwang Zhu Yongwei Dai Min), the cathode tool can be processed according to the cavity The corresponding cathode tools are replaced to meet the processing requirements of complex shallow cavity structures in different structural forms.

In electrolytic machining, the tool electrode needs to have the characteristics of good corrosion resistance and good conductivity. At the same time, electrolytic machining is a copy-type machining. The shape accuracy of the tool electrode determines the shape accuracy of the workpiece. For parts with complex profiles such as blades and blisks, the entire blisk blade surface is distorted and complex, which is an irregular spatial geometry. The blades are ultra-thin and easy to deform, and the thickness is generally only a few millimeters; the curvature of the inlet and exhaust edges of the blades is relatively large, and the changes are drastic; the cascade channels between the blades are long and narrow, and the channels are usually tens of millimeters deep, and the narrowest point is only a few millimeters. mm. When processing such parts, the design of the tool electrode is often difficult, and it is necessary to take into account the twisted profile of the blade as a whole, which also increases the time cost of tool electrode processing and manufacturing.

Shape memory alloys refer to a class of alloys that have a certain initial shape after being plastically deformed at low temperature and fixed into another shape, and can be restored to the original shape by heating above a certain critical temperature. Due to its shape memory effect and good elasticity, related products of shape memory alloys have also penetrated into various fields such as aerospace, machinery, electronics, and medical treatment, and achieved good results.

In the patent "Aeroengine tip clearance active control device based on shape memory alloy wire" (application number 201711348615.3 applicant Beijing University of Aeronautics and Astronautics, inventor Pan Qiang Liu Wendong He Tian Shan Yingchun), the memory alloy wire is used to cooperate with the elastic plate Deformation changes the working state, and other adjustable mechanisms can complete the transformation of the working state of the variable cycle engine. It has the advantages of small structural weight, small occupied space, convenient control, and reliable movement.

In the patent "A Scale-type Integral Deformation Duct Ejector in a Variable Cycle Engine" (application number 201910723502.X applicant Beijing University of Aeronautics and Astronautics, inventor Hu Dianyin Wang Rongqiao Hu Shuhao Mao Jianxing Liu Qian), using temperature control shape memory The shape memory effect characteristics of the alloy, the pre-stretched shape memory alloy wire is connected to the aero-engine blade tip clearance actuator, and it is heated with a suitable current to generate a restoring force to drive the actuator to move up and quickly adjust the blade tip Clearance, to achieve active control of aeroengine tip clearance.

In the patent "A new type of automatic light tracking mechanism based on shape memory alloy" (application number 201820840598.9 applicant Nanjing University of Aeronautics and Astronautics, inventor Liu Lu, Li Chenyang, Huang Zixiang, Cao Yaqi), through the combined use of two light tracking mechanisms, to achieve 360° light tracking, high sensitivity, improves the efficiency of the spacecraft to collect solar energy.

In the patent "Soft robot design scheme based on SMA and SSMA drives" (application number 201410403563.5 applicant Beihang University, inventor Shi Zhenyun Liu Zhe Yuan Peijiang Chen Dongdong), provides a detection work suitable for complex environments and unknown fields , a soft robotic system based on shape memory alloy (SMA) wire and superelastic memory alloy (SSMA) wire drive and feedback, combined with flexible mechanism modules and foot rigid body joints.

To sum up, in order to process complex profiles by electrodes with simple shapes, based on the shape memory effect and superelasticity of shape memory alloys, this patent proposes an electrolytic machining method and device for autonomously controllable deformation of shape memory alloy electrodes.

Contents of the invention

Purpose of the invention:

The object of the present invention is to provide an electrolytic machining method and device capable of ensuring machining accuracy, simplifying electrode design, shortening part machining cycle, and improving machining efficiency.

Technical solutions:

An electrolytic machining method for autonomously controllable deformation of a shape memory alloy electrode, characterized in that it includes the following process:

The shape memory alloy is used as the electrode material, and the shape memory alloy electrode is made to correspond to different part surface line shapes at different temperatures through heat treatment;

The shape memory alloy electrode is installed with a floating fixture; the floating fixture refers to a fixture that uses the spring clamping end structure to automatically adjust the distance between the two clamping ends according to the length of the clamping object;

During processing, the temperature of the shape memory alloy electrode is adjusted by adjusting the temperature of the electrolyte, so that the shape memory alloy electrode generates deformation corresponding to the surface line of the part at different positions; wherein the highest temperature of the shape memory alloy is lower than its phase transition temperature;

After the processing is completed, the shape memory effect of the material is used to heat the shape memory alloy electrode to restore its shape for the next processing.

According to the electrolytic machining method of independent controllable deformation of the shape memory alloy electrode, it is suitable for large deformation processing, and it is characterized in that the shape memory alloy can be correctly deformed at the corresponding deformation temperature by the following method, and the maximum temperature is lower than its phase transition temperature :

Set the phase transition temperature of the shape memory alloy electrode as T ₀ ℃, and the initial temperature of the electrolyte as T ₁ ℃. During the large deformation process, the shape memory alloy electrode undergoes a total of i deformations, and the processing time between each deformation is the same. When one deformation is completed, the corresponding electrolyte temperature is T ₁ +i·ΔT°C.

In the first deformation process, it can be known from the basic laws of electrolytic machining such as Faraday's law and Ohm's law,

I=i·S

In the formula: the voltage between the negative and the anode; i is the current density; κ is the conductivity of the electrolyte; Δ is the processing gap; S is the processing area;

Since the resistivity of the shape memory alloy electrode is extremely low, the Joule heat generated by it is ignored, so during the processing, the Joule heat is mainly generated by the electrolyte;

The increase in electrolyte temperature after processing caused by Joule heat is T ₂

In the formula: Q is the Joule heat; t is the processing time; l is the proportion of the Joule heat taken away by the electrolyte;

In order to avoid the deformation of the shape memory alloy electrode that does not correspond to it during the first deformation process, then

T ₂ <T ₁ +ΔT

By analogy,

T _i <T ₁ +i·ΔT

Simplified:

That is, by reducing the conductivity of the electrolyte or increasing the proportion of Joule heat taken away by the electrolyte, the correct deformation of the shape memory alloy electrode during processing is ensured.

In addition, in order to avoid the phase transition of the shape memory alloy electrode, the final deformation temperature should be lower than the phase transition temperature of the shape memory alloy electrode

T ₁ +i·ΔT<T ₀

Therefore, it is necessary to choose the deformation temperature reasonably;

After the processing is completed, the shape memory effect of the material is used to heat the shape memory alloy electrode to restore its shape for the next processing.

The device for realizing the electrolytic machining method of autonomously controllable deformation of the shape memory alloy electrode is characterized in that:

The device consists of a two-axis numerical control platform, a control system, a power supply, a pressure gauge, a water pump, a liquid supply valve, a temperature control device, a filter, an electrolyte tank, a liquid return valve, a connecting rod, a guide body, a floating fixture, a water seal Fixtures, shape memory alloy electrodes, and workpieces;

The workpiece is connected with the connecting rod through the screw, and the connecting rod is installed on the X feed axis of the two-axis CNC platform;

The guide body is installed on the Z feed axis of the two-axis CNC platform, the shape memory alloy electrode is installed between the guide body and the two-axis CNC platform through the floating fixture, and the workpiece and the shape memory alloy electrode are sealed by the water sealing fixture;

Among them, the X feed axis and Z feed axis of the two-axis CNC platform are respectively connected to the positive and negative stages of the power supply through wires, and the control system controls the X feed axis of the two-axis CNC platform to move according to the set parameters through signal transmission, and the Z feed axis Give the axis a stop;

Among them, the pressure gauge, water pump, liquid supply valve, temperature control equipment, filter, electrolyte tank, and liquid return valve form the electrolyte circulation system, and the temperature control equipment is used to control the change of electrolyte temperature during processing.

The floating fixture is composed of two sets of chucks, which are all composed of limit screws, spring connecting sleeves and three-jaw chucks; the three-jaw chuck clamps one end of the shape memory alloy electrode and is installed on the spring connecting sleeve; a spring The connection sleeve is installed on the guide body through the limit screw, and the other spring connection sleeve is installed on the two-axis numerical control platform through the limit screw.

Beneficial effect:

Compared with the prior art, the present invention has the following significant advantages.

(1) An electrolytic machining method for autonomous and controllable deformation of shape memory alloy electrodes is provided, which is suitable for machining parts with complex profiles. The shape memory alloy is used as the tool electrode material, and the shape memory alloy electrode is made to correspond to different part surface line shapes at different temperatures through heat treatment; the shape memory effect is used to facilitate the independent deformation and recovery of the electrode by adjusting the temperature of the working fluid. Reasonable use of the dynamic deformation process of the self-recovery of the electrode can make the processed surface more suitable for the ideal surface.

(2) The tool electrode has good flexibility, the electrode deformation can be restored, and the electrode loss is small, which reduces the processing cost. The material of the tool electrode is a shape memory alloy. During the electrolytic machining, the tool electrode is used as the cathode, and the electrode is not worn out during the processing, and the shape memory effect of the shape memory alloy is used, the deformation of the electrode can be restored, and the tool electrode can be reused.

(3) The design of the tool electrode is simplified, and the processing of the tool electrode is simple. The shape of the tool electrode designed by the present invention is elongated tube or rod. Compared with nesting electrolytic machining, radial feed electrolytic machining and forming electrode EDM, the tool electrode is simple in design, easy to manufacture and easy to replace.

(4) The floating clamping method is adopted, which is beneficial to the deformation recovery of the shape memory alloy electrode, and is suitable for electrolytic machining of parts with large deformation.

(5) The scope of application is wide. In addition to processing variable-section blades and open blisks, it can also process parts with complex profiles such as closed blisks. According to the different profiles of workpieces to be processed, the tool electrode can be preformed according to the curvature change characteristics of the profile, so as to be processed. In addition, the diameter of the flexible electrode can be reduced as much as possible to ensure the processing requirements of narrow channels.

Description of drawings

Fig. 1 is a schematic diagram of a non-floating clamping electrolytic machining device with independent controllable deformation of a shape memory alloy electrode;

Figure 2 is a schematic diagram of recovery of the shape memory alloy electrode after processing;

Fig. 3 is a schematic diagram of a floating clamping electrolytic machining device with independent controllable deformation of a shape memory alloy electrode;

Fig. 4 is a schematic diagram of the structure of the spring connecting sleeve;

Fig. 5 is a schematic diagram of the floating clamping of the shape memory alloy electrode;

Figure 6 is a schematic diagram of the electrolytic machining of the shape memory alloy electrode with independent controllable deformation;

Figure 7 is a schematic diagram of the autonomous controllable deformation of the shape memory alloy electrode;

Label names in the figure: 1. Two-axis CNC platform, 2. Control system, 3. Power supply, 4. Pressure gauge, 5. Water pump, 6. Liquid supply valve, 7. Temperature control equipment, 8. Filter, 9. Electrolyte tank, 10, liquid return valve, 11, connecting sleeve, 12, three-jaw chuck, 13, water sealing fixture, 14, connecting rod, 15, guide body, 16, limit screw, 17, spring connecting sleeve, 18. Shape memory alloy electrode, 19. Work piece.

Detailed ways

The specific implementation process of the present invention will be introduced in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the non-floating clamping electrolytic machining device implementing the "electrolytic machining method for independent and controllable deformation of shape memory alloy electrodes" of the present invention is mainly composed of a two-axis numerical control platform 1, a control system 2, a power supply 3, a pressure gauge 4, Suction pump 5, liquid supply valve 6, temperature control equipment 7, filter 8, electrolyte tank 9, liquid return valve 10, connecting sleeve 11, three-jaw chuck 12, water sealing fixture 13, connecting rod 14, guide body 15 , a shape memory alloy electrode 18, and a workpiece 19.

As shown in Figure 3, the floating clamping electrolytic machining device implementing the "electrolytic machining method for autonomously controllable deformation of shape memory alloy electrodes" of the present invention mainly consists of a two-axis numerical control platform 1, a control system 2, a power supply 3, a pressure gauge 4, a pump Water pump 5, liquid supply valve 6, temperature control equipment 7, filter 8, electrolyte tank 9, liquid return valve 10, connecting sleeve 11, three-jaw chuck 12, water sealing fixture 13, connecting rod 14, guide body 15, The limit screw 16, the spring connection sleeve 17, the shape memory alloy electrode 18, and the workpiece 19 are composed.

Adopting the present invention to realize electrolytic machining of parts with complex profiles requires the following eight steps.

Step 1: The workpiece 19 is connected to the connecting rod 14 through screws, the connecting rod 14 is installed on the X feed axis of the two-axis CNC platform 1, the guide body 15 is installed on the Z feed axis of the two-axis CNC platform 1, and the spring connecting sleeve 17 is installed on the guide body 15 through the limit screw 16, the spring connecting sleeve 17 and the three-jaw chuck 12 are floating and clamped with the shape memory alloy electrode, the spring connecting sleeve 17 and the three-jaw chuck 12 are connected through pin holes, and the three claws The chuck 12 clamps and fastens the shape memory alloy electrode 18, and the workpiece 19 and the shape memory alloy electrode 18 are sealed through the water sealing fixture 13;

Step 2: The X feed axis and the Z feed axis of the dual-axis CNC platform 1 are respectively connected to the positive and negative stages of the power supply 3 through wires, and the control system 2 controls the X feed axis of the dual-axis CNC platform 1 through signal transmission. Set the parameters to move, and the Z feed axis stops moving;

Step 3: Pressure gauge 4, water pump 5, liquid supply valve 6, temperature control equipment 7, filter 8, electrolyte tank 9, and liquid return valve 10 form an electrolyte circulation system, and temperature control equipment 7 is used to control the processing process The change of electrolyte temperature;

Step 4: Detect and check the position of the previously installed parts;

Step 5: The power supply 3 is powered on, and the control system 2 controls the X feed axis of the dual-axis CNC platform 1 to move according to the set parameters through signal transmission. The X feed axis drives the workpiece 19 to move forward, and the Z feed axis is fixed; at the same time , pressure gauge 4, water pump 5, liquid supply valve 6, temperature control equipment 7, filter 8, electrolyte tank 9, liquid return valve 10, the electrolyte circulation system works, temperature control equipment 7 regulates the electrolysis during processing The temperature of the liquid changes with the change of the processing position; the shape memory alloy electrode 18 is deformed correspondingly with the change of the electrolyte temperature, because the shape memory alloy electrode 18 and the spring connecting sleeve 17 and the three-jaw chuck 12 are floating and clamped, Therefore, the spring connecting sleeve 17 and the three-jaw chuck 12 move up and down with the deformation of the shape memory alloy electrode 18, as shown in Figure 5; the structure of the spring connecting sleeve 17 is shown in Figure 4, and the deformation recovery process is shown in Figure 6-7 Show;

Step 6: After the processing is completed, the power supply 3 is powered off, the electrolyte circulation system stops working, and the shape memory alloy electrode 18 is removed;

Step 7: heating the deformed shape memory alloy electrode 18 to a set temperature to make it return to deformation;

Step 8: Repeat the above process to complete subsequent processing.

Claims (2)

1. An electrolytic machining method for autonomously controllable deformation of a shape memory alloy electrode, characterized in that it comprises the following processes: The shape memory alloy is used as the electrode material, and the shape memory alloy electrode is made to correspond to different part surface line shapes at different temperatures through heat treatment; The shape memory alloy electrode is installed with a floating fixture; the floating fixture refers to a fixture that uses the spring clamping end structure to automatically adjust the distance between the two clamping ends according to the length of the clamping object; During processing, the temperature of the shape memory alloy electrode is adjusted by adjusting the temperature of the electrolyte, so that the shape memory alloy electrode generates deformation corresponding to the surface line of the part at different positions; wherein the highest temperature of the shape memory alloy is lower than its phase transition temperature; The correct deformation of the shape memory alloy at the corresponding deformation temperature is ensured by the following methods, and the maximum temperature is lower than its phase transition temperature: Set the phase transition temperature of the shape memory alloy electrode (18) as T ₀ °C, and the initial temperature of the electrolyte as T ₁ °C, during the large deformation process, the shape memory alloy electrode (18) undergoes a total of i deformations, each deformation The processing time at intervals is the same, and when one deformation is completed, the corresponding electrolyte temperature is T ₁ +i·ΔT°C; In the first deformation process, it can be known from the basic laws of electrolytic machining such as Faraday's law and Ohm's law,

I=i·S In the formula: the voltage between the negative and the anode; i is the current density; κ is the conductivity of the electrolyte; Δ is the processing gap; S is the processing area; Since the resistivity of the shape memory alloy electrode (18) is extremely low, the Joule heat generated by it is ignored, so during the processing, the Joule heat is mainly generated by the electrolyte;

The increase in electrolyte temperature after processing caused by Joule heat is T ₂

In the formula: Q is the Joule heat; t is the processing time; l is the proportion of the Joule heat taken away by the electrolyte; In order to avoid the deformation of the shape memory alloy electrode (18) that does not correspond to it during the first deformation process, then T ₂ <T ₁ +ΔT By analogy, T _i <T ₁ +i·ΔT Simplified:

That is, by reducing the conductivity of the electrolyte or increasing the proportion of Joule heat taken away by the electrolyte, it is ensured that the shape memory alloy electrode (18) is correctly deformed during processing; In addition, in order to avoid the phase transition of the shape memory alloy electrode (18), the final deformation temperature should be lower than the phase transition temperature of the shape memory alloy electrode (18) T ₁ +i·ΔT<T ₀ Therefore, it is necessary to choose the deformation temperature reasonably; After the processing is completed, the shape memory effect of the material is used to heat the shape memory alloy electrode to restore its shape for the next processing. 2. The device for realizing the electrolytic machining method of autonomously controllable deformation of the shape memory alloy electrode according to claim 1, characterized in that: The device consists of a two-axis numerical control platform (1), a control system (2), a power supply (3), a pressure gauge (4), a water pump (5), a liquid supply valve (6), a temperature control device (7), a filter device (8), electrolyte tank (9), liquid return valve (10), connecting rod (14), guide body (15), floating fixture, water sealing fixture (13), shape memory alloy electrode (18), workpiece (19) composition; Wherein the workpiece (19) is connected with the connecting rod (14) by a screw, and the connecting rod (14) is installed on the X feed axis of the biaxial numerical control platform (1); The guide body (15) is installed on the Z feed axis of the two-axis CNC platform (1), and the shape memory alloy electrode (18) is installed between the guide body (15) and the two-axis CNC platform (1) through a floating fixture. (19) complete sealing with the shape memory alloy electrode (18) through the water sealing fixture (13); The X feed axis and the Z feed axis of the two-axis CNC platform (1) are respectively connected to the positive and negative stages of the power supply (3) through wires, and the control system (2) controls the X axis of the two-axis CNC platform (1) through signal transmission. The feed axis moves according to the set parameters, and the Z feed axis stops moving; Among them, the pressure gauge (4), the water pump (5), the liquid supply valve (6), the temperature control equipment (7), the filter (8), the electrolyte tank (9), and the liquid return valve (10) form the electrolyte circulation system, the temperature control device (7) is used to control the change of the temperature of the electrolyte in the process of processing; The floating fixture is composed of two sets of chucks, which are all composed of limit screws (16), spring connecting sleeves (17) and three-jaw chucks (12); the three-jaw chucks (12) clamp the shape memory alloy One end of the electrode is installed on the spring connection sleeve (17); one spring connection sleeve (17) is installed on the guide body (15) through the limit screw (16), and the other spring connection sleeve (17) is installed on the guide body (15) through the limit screw (16) ) is installed on the two-axis numerical control platform (1).

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