CN115780928A - Shape memory alloy electrode autonomous controllable deformation electrolytic machining method and device - Google Patents
Shape memory alloy electrode autonomous controllable deformation electrolytic machining method and device Download PDFInfo
- Publication number
- CN115780928A CN115780928A CN202211407585.XA CN202211407585A CN115780928A CN 115780928 A CN115780928 A CN 115780928A CN 202211407585 A CN202211407585 A CN 202211407585A CN 115780928 A CN115780928 A CN 115780928A
- Authority
- CN
- China
- Prior art keywords
- shape memory
- memory alloy
- alloy electrode
- temperature
- deformation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
- B23H3/04—Electrodes specially adapted therefor or their manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
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
Technical Field
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.
Background
An aircraft engine is one of the most complex industrial products and is known as 'bright pearl on industrial manufacturing crown'. As the heart of an airplane, the level of manufacture reflects to some extent the scientific and industrial level of a country. With the continuous improvement of airplane performance, the performance requirement on the aircraft engine is higher and higher. The integral blade disc reduces the number and the weight of parts, avoids the overflow pressure loss of tenon-mortise connection, improves the pneumatic performance, and ensures that the structure of the aero-engine is simplified, the reliability is enhanced, and the thrust-weight ratio is increased. After the whole-circle blade shroud is added to the edge of the blade of the closed blisk, the flutter of the blade can be effectively inhibited, and the overall strength and rigidity of the blisk are improved. In foreign countries, 4 th generation combat aircraft engines represented by F119, F120, EJ200, and the like have generally adopted a blisk structure. After an engine of R & R company in England adopts a blisk structure, the weight of the engine is reduced by 50 percent compared with the traditional blade and disk split structure; after the lifting force fan of the JSF of the United states attack machine adopts a blisk structure, 30% of cooling air is reduced, the service life is prolonged by 100%, and the weight is reduced by 25% -30%.
Electrochemical machining is a machining method based on the principle of electrochemical anodic dissolution to remove material. The hardness of the tool material can be lower than that of a machined part in electrolytic machining, so that the tool material is often used for machining materials which are difficult to cut, such as high strength, high hardness, high temperature resistance and the like; meanwhile, in the machining process, the electrochemical machining tool and the machined workpiece always keep a machining gap, and no cutting force exists during machining, so that the electrochemical machining tool is suitable for machining precision parts with thin walls, easy deformation and other complex profiles. Because the electrochemical machining has the characteristics, the electrochemical machining is widely applied to the field of aerospace and becomes one of the main machining processes for machining parts of aero-engines.
In a patent of 'a ring-shaped electrode processed by blisk electrolytic grooving and a process method' (application number 201210367002.5 applicant Shenyang dawn aircraft engine (group) finite liability company, inventor Zhuhainan Yangshan Yangshi Wei), efficient processing of blisk wide-chord and large-twist-angle blade-shaped channel grooving is realized in a material sleeving electrolytic processing mode.
In a patent 'multi-electrode spiral feeding integral impeller inter-blade flow channel electrolytic machining method' (application number 200910025834.7, nanjing aerospace university, inventor Zhu Ding Xuxu Zhengyang), a blade grid channel is machined by using a tubular electrode with a simple shape through multi-dimensional interpolation motion between a tool cathode and a workpiece anode.
In the patent of 'a non-uniform double-rotation transformation processing edge cathode blisk electrolytic processing method' (application number 201910756930.2 applicant Nanjing aerospace university, inventor Xujingyang king Jingzhuianan), the processing edge of the cathode is designed to be a widening processing edge, and is driven to rotate and feed in a radial direction at a unidirectional variable speed according to a simulation track; the blank is driven to rotate in a variable speed mode in cooperation with the cathode direction change according to simulation optimized parameters, a cascade channel is formed on the blank, and the distribution uniformity of machining allowance is improved.
In a patent 'a precise electrolytic machining method of a variable-section blade' (application number 201910818869.X applicant, china aviation power generation division Co., ltd., wangfuping Chenglianglei dawn crystal Hu Sijia Li Yuan Jing Po Populus Bohuang Chucachu), the stabilization of the precise electrolytic machining process of the variable-section blade profile is realized, and the defects of long machining period, low machining efficiency and high production cost of the conventional numerical control milling of the blisk blade profile are overcome.
In the patent "double-blade nesting electrochemical machining device and machining method thereof" (application number 202010425084.9, nanjing aerospace university of Nanjing aerospace, inventor Zhu-zhang-Xiao-Bolin-Home), an integral tool cathode with two characteristics is designed for an integral component with large and small blades, and the tool cathode is axially fed to realize the rapid nesting machining of the double blades.
In a patent 'jacking electrochemical machining clamp and method for not dissolving a diffuser at the tail edge of a blade' (application number 201910195765.8 applicant Nanjing aerospace university, inventor Zhudonglinjia Hokkisna Yuchen Yucheng Yan mountain Song Yang Chen Caesa Luo Dingjiang), the problems that the pressure of the clamp is too high and electrolyte is easy to leak during the electrolytic machining of the jacking of the diffuser are solved, the flow field stability is favorably improved, and the machining quality is improved.
In the patent of an electrolytic machining method for a thin-wall casing of an aircraft engine (application number 201410547093.X, nanjing aerospace university, inventor Zhu Yiwei hongruiwang caraway), the anode of a workpiece rotates, the cathode of the tool moves in the circumferential direction and feeds to the anode, the electrode does not need to be replaced in the whole machining process, and the concave-convex structure on the surface of the thin-wall revolving part is machined and formed at one time through the electrolytic action of a rolling sleeve of a cathode window.
In a patent 'a machine tool rotary unit and a high-precision spin-printing electrolytic machining machine tool for case parts' (application number 201810339512.9, nanjing aerospace university, inventor Wangdongyon, red, silvery and liberty-augmenting liberty-oriented), a novel electrolytic machining machine tool is designed, the transmission precision is improved, the machining current is allowed to be large, the advantage of efficient machining of electrolytic machining is fully played, and the application range of spin-printing electrolytic machining is expanded.
In the patent of 'electrolytic machining device and electrolytic machining method for shallow cavity structure on surface of thin-wall case' (application number 202010849493.1 university of Yangzhou of applicant, inventor Gewang Chengwangwang ZhuYongwei David), a cathode tool can be replaced with a corresponding cathode tool according to different machining cavities, so that the machining requirements of complex shallow cavity structures with different structural forms are met.
In electrolytic machining, a tool electrode is required to have characteristics of good corrosion resistance, good electrical conductivity, and the like. Meanwhile, the electrochemical machining belongs to copy type machining, the shape precision of a tool electrode determines the shape precision of a machined workpiece, and for parts with complex profiles such as blades and blisks, the profile of the blisk blade is complex in distortion and is an irregular space geometric profile; the blade is ultrathin and easy to deform, and the thickness is generally only a few millimeters; the curvature of the air inlet and outlet edges of the blades is large and changes violently; the cascade channels between the blades are narrow and long, the channels are usually tens of millimeters deep, and the narrowest point is only a few millimeters. When machining such parts, the design of the tool electrode is often difficult, and the overall twisted profile of the blade needs to be considered, which additionally increases the time cost for machining and manufacturing the tool electrode.
Shape memory alloys are alloys that have an initial shape that can be recovered to the initial shape by heating above a certain critical temperature after being plastically deformed at low temperature and fixed to another shape. Because the shape memory alloy has the shape memory effect and good elasticity, the related products of the shape memory alloy also permeate into various fields of aerospace, machinery, electronics, medical treatment and the like, and the good effect is obtained.
In the patent 'shape memory alloy wire-based active control device for the blade tip clearance of an aeroengine' (application number 201711348615.3 applicant, beijing aerospace university, inventor Panqian Liu Wento field, single spring), the memory alloy wire and the elastic plate are matched to deform to change the working state, and the change of the working state of the variable cycle engine can be completed by matching with other adjustable mechanisms.
In the patent 'a scale-type integrally-deformed duct ejector in a variable cycle engine' (application number 201910723502.X applicant Beijing aerospace university, inventor Huizhou print Wangchao Huishuhihe Majiaxing Liu Rubia), a prestretched shape memory alloy wire is connected to an actuating device for the blade tip gap of an aircraft engine by utilizing the shape memory effect characteristic of a temperature control shape memory alloy, and the prestretched shape memory alloy wire is heated by adopting proper current to generate restoring force to drive the actuating device to move upwards so as to quickly adjust the blade tip gap and realize the active control of the blade tip gap of the aircraft engine.
In a patent 'a novel automatic light following mechanism based on shape memory alloy' (application number 201820840598.9 applicant Nanjing aerospace university, inventor Liululi morning sun yellow flying Cao Asia), through the compound use of two light following mechanisms, 360-degree light following is realized, the sensitivity is high, and the efficiency of the spacecraft for collecting solar energy is improved.
In a patent 'software robot design scheme based on SMA and SSMA drive' (application No. 201410403563.5 applicant Beijing aerospace university, inventor Shizuyu Liuji Yuanying Jiangjiang winter), a software robot system which is suitable for detection work in complex environments and unknown fields and combines a flexible mechanism module and a foot rigid body joint to cooperate based on Shape Memory Alloy (SMA) wire and superelasticity memory alloy (SSMA) wire drive and feedback is provided.
In summary, in order to process a complex profile by a simple shape electrode based on the shape memory effect and superelasticity of the shape memory alloy, the patent provides an autonomous controllable deformation electrochemical processing method and device for the shape memory alloy electrode.
Disclosure of Invention
The purpose of the invention is as follows:
the invention aims to provide an electrolytic machining method and device which can ensure the machining precision, simplify the electrode design, shorten the part machining period and improve the machining efficiency.
The technical scheme is as follows:
an electrolytic machining method for shape memory alloy electrode autonomous controllable deformation is characterized by comprising the following processes:
adopting shape memory alloy as an electrode material, and enabling the shape memory alloy electrode to correspond to different part profile line shapes at different temperatures through heat treatment;
mounting a shape memory alloy electrode by using a floating clamp; the floating clamp is a clamp which utilizes a spring clamping end structure to automatically adjust the distance between two clamping ends according to the length of a clamping object;
during processing, the temperature of the shape memory alloy electrode is regulated and controlled by regulating and controlling the temperature of the electrolyte, so that the shape memory alloy electrode generates deformation corresponding to part profile lines at different positions; wherein the maximum temperature of the shape memory alloy is lower than the phase transition temperature thereof;
after the processing is finished, the shape memory effect of the material is utilized, and the shape memory alloy electrode is heated to be restored to the shape for the next processing.
The electrochemical machining method for the shape memory alloy electrode with the autonomous controllable deformation is suitable for large deformation machining, and is characterized in that the shape memory alloy is ensured to generate correct deformation at a corresponding deformation temperature and the highest temperature is lower than the phase transition temperature of the shape memory alloy in the following modes:
setting the phase transition temperature of the shape memory alloy electrode to T 0 DEG C, initial electrolyteInitial temperature of T 1 During the large deformation processing, the shape memory alloy electrode undergoes i times of deformation, the processing time of each deformation interval is the same, and the corresponding electrolyte temperature is T when each deformation is finished 1 +i·ΔT℃。
In the first deformation process, the basic law of electrolytic machining such as Faraday's law, ohm's law and the like can be known,
I＝i·S
wherein, the voltage between the cathode and the anode is shown in the formula; i is the current density; kappa is the electrolyte conductivity; delta is the machining gap; s is the processing area;
because the resistivity of the shape memory alloy electrode is extremely low, the generated joule heat is ignored, and therefore, the joule heat is mainly generated by the electrolyte in the processing process;
and the rise of the temperature of the electrolyte after processing caused by Joule heat is T 2
Wherein Q is Joule heat; t is the processing time; l is the ratio of Joule heat carried away by the electrolyte;
in order to avoid the shape memory alloy electrode from generating deformation which is not corresponding to the shape memory alloy electrode in the first deformation process, the shape memory alloy electrode is subjected to deformation treatment
T 2 ＜T 1 +ΔT
By analogy with this, the following is done,
T i ＜T 1 +i·ΔT
simplifying to obtain:
namely, the correct deformation of the shape memory alloy electrode in the processing process is ensured by reducing the conductivity of the electrolyte or increasing the Joule heat ratio of the electrolyte.
In addition, in order to avoid the phase transformation of the shape memory alloy electrode, the final deformation temperature should be less than the phase transformation temperature of the shape memory alloy electrode
T 1 +i·ΔT＜T 0
Therefore, the deformation temperature needs to be reasonably selected;
after the processing is finished, the shape memory effect of the material is utilized, and the shape memory alloy electrode is heated to recover the shape for the next processing.
The device for realizing the electrolytic machining method of the shape memory alloy electrode with the autonomous controllable deformation is characterized in that:
the device consists of a double-shaft numerical control platform, a control system, a power supply, a pressure gauge, a water suction pump, a liquid supply valve, temperature regulation and control equipment, a filter, an electrolyte tank, a liquid return valve, a connecting rod, a flow guide body, a floating clamp, a water sealing clamp, a shape memory alloy electrode and a workpiece;
wherein the workpiece is connected with a connecting rod through a screw, and the connecting rod is arranged on an X feed shaft of the double-shaft numerical control platform;
the flow guide body is arranged on a Z feed shaft of the double-shaft numerical control platform, the shape memory alloy electrode is arranged between the flow guide body and the double-shaft numerical control platform through a floating clamp, and the workpiece and the shape memory alloy electrode are sealed through a water sealing clamp;
the X feed shaft and the Z feed shaft of the double-shaft numerical control platform are respectively connected with the positive and negative stages of a power supply through leads, the control system controls the X feed shaft of the double-shaft numerical control platform to move according to set parameters through signal transmission, and the Z feed shaft stops moving;
the electrolyte circulating system consists of a pressure gauge, a water pump, a liquid supply valve, a temperature regulating device, a filter, an electrolyte tank and a liquid return valve, and the temperature regulating device is used for regulating and controlling the change of the temperature of the electrolyte in the machining process.
The floating clamp consists of two groups of chucks, which consist of a limit screw, a spring connecting sleeve and a three-jaw chuck; the three-jaw chuck clamps one end of the shape memory alloy electrode and then is arranged on the spring connecting sleeve; one spring connecting sleeve is arranged on the flow guide body through a limiting screw, and the other spring connecting sleeve is arranged on the double-shaft numerical control platform through a limiting screw.
Has the advantages that:
compared with the prior art, the invention has the following remarkable advantages.
(1) The electrochemical machining method for the shape memory alloy electrode with the autonomous controllable deformation is provided, and is suitable for machining parts with complex profiles. The shape memory alloy is adopted as a tool electrode material, and the shape memory alloy electrode is made to correspond to different part profile line shapes at different temperatures through heat treatment; by utilizing the shape memory effect, the autonomous deformation and the recovery of the electrode are convenient to realize by regulating and controlling the temperature of the working solution, and the processed molded surface can be more attached to an ideal molded surface by reasonably utilizing the dynamic deformation process of the autonomous recovery of the electrode.
(2) The tool electrode has good flexibility, the electrode can be recovered after deformation, the electrode loss is small, and the processing cost is reduced. The tool electrode is made of shape memory alloy, and is used as a cathode during electrolytic machining, the electrode is lossless in the machining process, the electrode can be restored after deformation by utilizing the shape memory effect of the shape memory alloy, and the tool electrode can be repeatedly used.
(3) The design of the tool electrode is simplified, and the tool electrode is easy to machine. The tool electrode designed by the invention is in a slender tubular or rod shape, and compared with the sleeve material electrolytic machining, the radial feeding electrolytic machining and the forming electrode electric spark machining, the tool electrode is simple in design, easy to manufacture and convenient to replace.
(4) The floating type clamping mode is adopted, deformation recovery of the shape memory alloy electrode is facilitated, and the method is suitable for electrolytic machining of parts with large deformation.
(5) The application range is wide. Besides processing variable cross-section blades and open-type blade discs, parts with complex profiles such as closed integral blade discs and the like can be processed. According to the difference of the profile of the workpiece to be machined, the tool electrode can be preformed according to the curvature change characteristic of the profile of the tool electrode, so that machining can be carried out. In addition, the diameter of the flexible electrode can be reduced as much as possible, so that the processing requirement of a narrow channel is ensured.
Drawings
FIG. 1 is a schematic view of an autonomous controllable deformation non-floating clamping electrochemical machining device for shape memory alloy electrodes;
FIG. 2 is a schematic view of a processed shape memory alloy electrode recovery;
FIG. 3 is a schematic view of an autonomous controllable deformation floating clamping electrochemical machining device for shape memory alloy electrodes;
FIG. 4 is a schematic view of a spring coupling sleeve;
FIG. 5 is a schematic view of floating clamping of the shape memory alloy electrode;
FIG. 6 is a schematic view of autonomous controlled deformation electrochemical machining of a shape memory alloy electrode;
FIG. 7 is a schematic view of autonomous controllable deformation of a shape memory alloy electrode;
number designation in the figures: 1. the device comprises a double-shaft numerical control platform, 2, a control system, 3, a power supply, 4, a pressure gauge, 5, a water suction pump, 6, a liquid supply valve, 7, temperature regulation and control equipment, 8, a filter, 9, an electrolyte tank, 10, a liquid return valve, 11, a connecting sleeve, 12, a three-jaw chuck, 13, a water sealing clamp, 14, a connecting rod, 15, a flow guide body, 16, a limiting screw, 17, a spring connecting sleeve, 18, a shape memory alloy electrode, 19 and a workpiece.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in figure 1, the non-floating clamping electrolytic machining device for implementing the electrolytic machining method for the shape memory alloy electrode with the autonomous controllable deformation mainly comprises a double-shaft numerical control platform 1, a control system 2, a power supply 3, a pressure gauge 4, a water suction pump 5, a liquid supply valve 6, a temperature regulating device 7, a filter 8, an electrolyte tank 9, a liquid return valve 10, a connecting sleeve 11, a three-jaw chuck 12, a water sealing clamp 13, a connecting rod 14, a flow guide body 15, a shape memory alloy electrode 18 and a workpiece 19.
As shown in fig. 3, the floating clamping electrolytic machining device for implementing the electrolytic machining method of autonomous controllable deformation of a shape memory alloy electrode according to the present invention mainly comprises a biaxial 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 8, an electrolyte tank 9, a liquid return valve 10, a connecting sleeve 11, a three-jaw chuck 12, a water sealing clamp 13, a connecting rod 14, a flow guide body 15, a limit screw 16, a spring connecting sleeve 17, a shape memory alloy electrode 18, and a workpiece 19.
The electrolytic machining of the complex-profile part by adopting the invention needs the following eight steps.
The method comprises the following steps: a workpiece 19 is connected with a connecting rod 14 through a screw, the connecting rod 14 is installed on an X feed shaft of a double-shaft numerical control platform 1, a guide body 15 is installed on a Z feed shaft of the double-shaft numerical control platform 1, a spring connecting sleeve 17 is installed on the guide body 15 through a limiting screw 16, the spring connecting sleeve 17, a three-jaw chuck 12 and a shape memory alloy electrode are subjected to floating clamping, the spring connecting sleeve 17 and the three-jaw chuck 12 are connected through a pin hole, the three-jaw 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 a water sealing clamp 13;
step two: wherein, an X feed shaft and a Z feed shaft of the double-shaft numerical control platform 1 are respectively connected with the positive and negative stages of the power supply 3 through leads, the control system 2 controls the X feed shaft of the double-shaft numerical control platform 1 to move according to set parameters through signal transmission, and the Z feed shaft stops moving;
step three: the electrolyte circulating system consists of a pressure gauge 4, a water pump 5, a liquid supply valve 6, a temperature regulating device 7, a filter 8, an electrolyte tank 9 and a liquid return valve 10, and the temperature regulating device 7 is used for regulating and controlling the change of the temperature of the electrolyte in the machining process;
step four: detecting and correcting the position of the front mounted part;
step five: the power supply 3 is electrified, the control system 2 controls the X feed shaft of the double-shaft numerical control platform 1 to move according to set parameters through signal transmission, the X feed shaft drives the workpiece 19 to feed forwards, and the Z feed shaft is fixed; meanwhile, an electrolyte circulating system consisting of a pressure gauge 4, a water suction pump 5, a liquid supply valve 6, a temperature regulating device 7, a filter 8, an electrolyte tank 9 and a liquid return valve 10 works, and the temperature regulating device 7 regulates and controls the temperature of the electrolyte in the machining process to change along with the change of the machining position; the shape memory alloy electrode 18 deforms correspondingly with the change of the temperature of the electrolyte, and the shape memory alloy electrode 18, the spring connecting sleeve 17 and the three-jaw chuck 12 are clamped in a floating mode, so that the spring connecting sleeve 17 and the three-jaw chuck 12 move up and down along with the deformation of the shape memory alloy electrode 18, as shown in fig. 5; the structure of the spring connecting sleeve 17 is shown in figure 4, and the deformation recovery process is shown in figures 6-7;
step six: after the processing is finished, the power supply 3 is cut off, the electrolyte circulating system stops working, and the shape memory alloy electrode 18 is detached;
step seven: heating the deformed shape memory alloy electrode 18 to a set temperature to enable the deformed shape memory alloy electrode to recover and deform;
step eight: and (5) circulating the processes to finish the subsequent processing for multiple times.
Claims (2)
1. An electrolytic machining method for shape memory alloy electrode autonomous controllable deformation is characterized by comprising the following processes:
the shape memory alloy is adopted as an electrode material, and the shape memory alloy electrode is made to correspond to different part profile line shapes at different temperatures through heat treatment;
mounting a shape memory alloy electrode by using a floating clamp; the floating clamp is a clamp which utilizes a spring clamping end structure to automatically adjust the distance between two clamping ends according to the length of a clamping object;
during processing, the temperature of the shape memory alloy electrode is regulated and controlled by regulating the temperature of the electrolyte, so that the shape memory alloy electrode generates deformation corresponding to part profile lines at different positions; wherein the maximum temperature of the shape memory alloy is below its phase transition temperature;
ensuring that the shape memory alloy is correctly deformed at the corresponding deformation temperature and the highest temperature is lower than the phase transition temperature thereof by:
setting the phase transition temperature of the shape memory alloy electrode (18) to T 0 The initial temperature of the electrolyte is T DEG C 1 At a temperature of greater thanIn the deformation processing process, the shape memory alloy electrode (18) undergoes i times of deformation, the processing time of each deformation interval is the same, and the corresponding electrolyte temperature is T when each deformation is finished 1 +i·ΔT℃；
In the first deformation process, the basic law of electrolytic processing such as Faraday law, ohm law and the like is known,
I＝i·S
wherein, the voltage between the cathode and the anode is shown; i is the current density; kappa is the electrolyte conductivity; delta is the machining gap; s is the processing area;
because the resistivity of the shape memory alloy electrode (18) is extremely low, the joule heat generated by the electrode is ignored, and therefore the joule heat is mainly generated by the electrolyte in the processing process;
and the rise of the temperature of the electrolyte after processing caused by Joule heat is T 2
In the formula, Q is Joule heat; t is the processing time; l is the ratio of Joule heat carried away by the electrolyte;
in order to avoid a deformation of the shape memory alloy electrode (18) which does not correspond thereto during the first deformation, the shape memory alloy electrode is deformed
T 2 ＜T 1 +ΔT
By analogy with this, the following is done,
T i ＜T 1 +i·ΔT
simplifying to obtain:
the shape memory alloy electrode (18) is ensured to generate correct deformation in the processing process by reducing the conductivity of the electrolyte or increasing the Joule heat ratio of the electrolyte;
in addition, in order to avoid phase transformation of the shape memory alloy electrode (18), the final deformation temperature should be less than the phase transformation temperature of the shape memory alloy electrode (18)
T 1 +i·ΔT＜T 0
Therefore, the deformation temperature needs to be reasonably selected;
after the processing is finished, the shape memory effect of the material is utilized, and the shape memory alloy electrode is heated to be restored to the shape for the next processing.
2. An apparatus for carrying out the electrolytic processing method of autonomous controlled deformation of a shape memory alloy electrode according to claim 1, characterized in that:
the device consists of a double-shaft numerical control platform (1), a control system (2), a power supply (3), a pressure gauge (4), a water suction pump (5), a liquid supply valve (6), temperature regulation and control equipment (7), a filter (8), an electrolyte tank (9), a liquid return valve (10), a connecting rod (14), a flow guide body (15), a floating clamp, a water sealing clamp (13), a shape memory alloy electrode (18) and a workpiece (19);
wherein the workpiece (19) is connected with the connecting rod (14) through a screw, and the connecting rod (14) is arranged on an X feed shaft of the double-shaft numerical control platform (1);
the guide body (15) is installed on a Z feed shaft of the double-shaft numerical control platform (1), the shape memory alloy electrode (18) is installed between the guide body (15) and the double-shaft numerical control platform (1) through a floating clamp, and the workpiece (19) and the shape memory alloy electrode (18) are sealed through a water sealing clamp (13);
wherein an X feed shaft and a Z feed shaft of the double-shaft numerical control platform (1) are respectively connected with the positive and negative stages of the power supply (3) through leads, a control system (2) controls the X feed shaft of the double-shaft numerical control platform (1) to move according to set parameters through signal transmission, and the Z feed shaft stops moving;
the electrolyte circulating system consists of a pressure gauge (4), a water suction pump (5), a liquid supply valve (6), a temperature regulating device (7), a filter (8), an electrolyte tank (9) and a liquid return valve (10), and the temperature regulating device (7) is used for regulating and controlling the change of the temperature of the electrolyte in the machining process;
the floating clamp consists of two groups of chucks, which are respectively composed of a limit screw (16), a spring connecting sleeve (17) and a three-jaw chuck (12); the three-jaw chuck (12) clamps one end of the shape memory alloy electrode and then is arranged on the spring connecting sleeve (17); one spring connecting sleeve (17) is arranged on the flow guide body (15) through a limiting screw (16), and the other spring connecting sleeve (17) is arranged on the double-shaft numerical control platform (1) through the limiting screw (16).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111336135.1A CN114160894A (en) | 2021-11-11 | 2021-11-11 | Autonomous controllable deformation electromachining method for shape memory alloy flexible electrode |
| CN2021113361351 | 2021-11-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115780928A true CN115780928A (en) | 2023-03-14 |
Family
ID=80478897
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111336135.1A Pending CN114160894A (en) | 2021-11-11 | 2021-11-11 | Autonomous controllable deformation electromachining method for shape memory alloy flexible electrode |
| CN202211407585.XA Pending CN115780928A (en) | 2021-11-11 | 2022-11-10 | Shape memory alloy electrode autonomous controllable deformation electrolytic machining method and device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111336135.1A Pending CN114160894A (en) | 2021-11-11 | 2021-11-11 | Autonomous controllable deformation electromachining method for shape memory alloy flexible electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN114160894A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113478031B (en) * | 2021-07-28 | 2022-06-10 | 南京航空航天大学 | Flexible electrode dynamic deformation electrolytic machining method and application |
| CN114769757B (en) * | 2022-04-25 | 2024-08-13 | 合肥市贵谦信息科技有限公司 | Electrolytic machining method for machining hole structure |
| CN114932273B (en) * | 2022-05-09 | 2023-08-01 | 南京航空航天大学 | Flexible electrode dynamic deformation electrolytic machining device and method for multi-blade grid of integral component |
| CN114769761B (en) * | 2022-05-09 | 2023-08-01 | 南京航空航天大学 | Double-electrode electrolytic machining device and method for dynamic deformation of flexible electrode |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0688176B2 (en) * | 1984-11-08 | 1994-11-09 | 松下電器産業株式会社 | Wire cut electrical discharge machining method |
| JP3941249B2 (en) * | 1998-07-30 | 2007-07-04 | 株式会社デンソー | EDM machine |
| JP4604435B2 (en) * | 2001-09-12 | 2011-01-05 | トヨタ自動車株式会社 | EDM machine |
| CN104903040B (en) * | 2012-11-08 | 2018-03-30 | 株式会社放电精密加工研究所 | Electrode, the electrolytic machining device for having used the electrode, electrochemical machining method and the processed goods using this method processing |
| CN104588804A (en) * | 2015-01-06 | 2015-05-06 | 常州先进制造技术研究所 | Electrochemical machining device for small bent deep holes |
| CN107378154B (en) * | 2017-07-18 | 2023-08-25 | 青岛科技大学 | Multifunctional telescopic tool electrode for electrolytic machining of holes |
| CN113478031B (en) * | 2021-07-28 | 2022-06-10 | 南京航空航天大学 | Flexible electrode dynamic deformation electrolytic machining method and application |
-
2021
- 2021-11-11 CN CN202111336135.1A patent/CN114160894A/en active Pending
-
2022
- 2022-11-10 CN CN202211407585.XA patent/CN115780928A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN114160894A (en) | 2022-03-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115780928A (en) | Shape memory alloy electrode autonomous controllable deformation electrolytic machining method and device | |
| CN110935968B (en) | Integral electrolytic machining method and electrolytic tool for blisk | |
| CN109909570B (en) | Sleeve material electrolytic machining clamp and method for diffuser with insoluble blade tail edge | |
| CN113478031B (en) | Flexible electrode dynamic deformation electrolytic machining method and application | |
| US8161641B2 (en) | Compound electromachining | |
| CN101502901A (en) | Thin electrode for electrolytic machining of integral wheel | |
| CN110026630B (en) | Inner cavity variable tool cathode for electrochemical machining of large-distortion blade blisk | |
| CN107378154B (en) | Multifunctional telescopic tool electrode for electrolytic machining of holes | |
| Xu et al. | The tool design and experiments on electrochemical machining of a blisk using multiple tube electrodes | |
| CN109277654A (en) | Rotation print Electrolyzed Processing sealing liquid apparatus and method | |
| CN110842307A (en) | Electrochemical machining tool for complex inner wall structure with poor accessibility | |
| CN114769761B (en) | Double-electrode electrolytic machining device and method for dynamic deformation of flexible electrode | |
| CN112975012A (en) | Voltage regulation-based conical hub blisk multi-blade cascade electrolysis device and method | |
| CN207695795U (en) | Cylindrical inner wall micro-structure air film shields circumference array pipe electrode jet stream electrolytic machining device | |
| CN113210770A (en) | Electrolytic machining process for constant-section high-temperature alloy blisk | |
| CN113510283A (en) | Cutting tool and cutting process for titanium alloy material | |
| CN111906360A (en) | Nickel-based superalloy closed impeller rough machining method | |
| CN115055767B (en) | Electrolytic grinding cathode for manufacturing complex internal channel by polishing laser additive and application thereof | |
| EP2022587B1 (en) | Compound electromachining of turbine blades | |
| CN101362233A (en) | Comprehensive electro-machining | |
| CN114654034B (en) | Electrolytic machining device and method for leaf disk leaf grid group electrode | |
| CN114682863B (en) | Electrolytic machining method for double-sided combined double-cathode and sectional power control blisk | |
| CN114932273B (en) | Flexible electrode dynamic deformation electrolytic machining device and method for multi-blade grid of integral component | |
| CN114769754B (en) | Blade inlet/outlet edge precise electrolytic repair tool and method | |
| CN114700769B (en) | Aviation blade face machining, clamping and positioning method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |