A rotary ultrasonic vibration assisted electrochemical machining system and method

Abstract

The application discloses a rotary ultrasonic vibration assisted electrolytic machining system and method, and the system comprises a machine tool spindle, a conductive slip ring, an ultrasonic generator, an electrolytic direct current power supply and an ultrasonic vibration device, wherein the ultrasonic vibration device comprises a spindle connecting rod, an ultrasonic vibrator, a conductive rubber sleeve, an amplitude transformer, a cathode rod and a cathode head; the stator of the conductive slip ring is fixed on a machine tool, and the stator connection end is connected with the positive and negative poles of the ultrasonic generator respectively; the rotor of the conductive slip ring is fixed on the machine tool spindle, and the rotor connection end is connected with the positive and negative poles of the ultrasonic vibrator respectively; the spindle connecting rod is fixed on the machine tool spindle, the amplitude transformer is fixed on the spindle connecting rod and is fixedly connected with the ultrasonic vibrator, the lower end of the spindle connecting rod is connected with the upper end of the cathode rod through the conductive rubber sleeve, and the cathode head is fixed on the lower end of the cathode rod; the amplitude transformer is connected with the cathode rod. The application improves the electrolyte circulation and updating effect of a machining area, can make the ultrasonic vibration concentratedly transmitted to a workpiece machining area, and reduces energy loss.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic electrolytic composite machining, and in particular to a rotary ultrasonic vibration assisted electrolytic machining system and method. Background Art

[0002] Electrolytic machining is a special manufacturing method based on the principle of electrochemical anodic dissolution, which uses a tool cathode with a reasonable shape to achieve workpiece forming. The machining process is not limited by the hardness of the material and has the advantages of no cutting force, no wear of machining tools, and wide applicability. In some cases, due to the limitation of tool electrode size, the material removal rate of electrolytic machining can only reach hundreds of mm 3 / min, it is difficult to meet the manufacturing requirements of efficient processing of large structural parts.

[0003] Ultrasonic machining (UTM) utilizes ultrasonic vibrations to cut, grind, or otherwise remove material from a workpiece surface. Ultrasonic machining involves the end face of the tool vibrating at ultrasonic frequencies, and the free abrasive in the fluid between the tool and the workpiece mechanically impacts and polishes the surface, removing material. This method offers advantages such as low macro-cutting forces and excellent surface quality.

[0004] On the basis of electrolytic processing, supplemented by ultrasonic vibration, the oxidation layer of the processed area can be removed by using the cavitation effect of ultrasonic vibration, and the circulation efficiency of the electrolyte in the machining gap can be improved, so as to improve the material removal rate. At present, ultrasonic electrolytic composite machining mainly has three types of tool vibration, workpiece vibration and solution vibration. Solution ultrasonic vibration is relatively easy to realize, for example, the Chinese invention patent with the application publication number CN117047209A discloses an "ultrasonic assisted discharge-electrochemical-mechanical combined finishing method and device", which realizes the ultrasonic vibration of the solution through the ultrasonic vibrator installed at the bottom of the electrolytic tank. This kind of vibration mode has certain limitations, that is, the vibration of the vibrator cannot be effectively transmitted to the machining area of the workpiece, there is energy loss, and the vibration range is large, which is easy to cause the phenomenon of electrolyte heating. The cathode tool vibration has more achievements, for example, Ding Xiang of Yangzhou University puts forward a rotary ultrasonic vibration assisted electrolytic machining system in "Rotary ultrasonic composite / auxiliary electrolytic-discharge build-up machining system design and test", which realizes the ultrasonic vibration of the main shaft. The workpiece is fixed on the workbench, the tool electrode and the workpiece are immersed in the electrolyte at the same time, the tool electrode is fed with rotary and axial ultrasonic vibration, and the material is removed through rotary ultrasonic action and gap electrolytic discharge machining between the workpiece and the electrode. The above two technologies belong to static liquid type machining. In static liquid type machining, when machining deep grooves or deep holes and other structures, the ultrasonic vibration has general effect on the exchange between the electrolyte in the machining area and the external electrolyte, which leads to the difficulty in timely discharging of the insoluble product in the machining gap, thereby reducing the current density, and even possibly causing short circuit. At the same time, electrolytic machining will generate a large amount of heat, which accumulates in the machining area, causing the change of the conductivity of the electrolyte, reducing the machining precision and surface quality. Therefore, it is difficult to realize high-quality machining of deep grooves or deep holes and other structures by static liquid type machining.

[0005] Therefore, there is an urgent need in the art for an electrolytic machining system to solve the problems existing in the prior art. SUMMARY

[0006] The purpose of the present application is to provide a rotary ultrasonic vibration assisted electrolytic machining system and method to solve the problems existing in the prior art, improve the electrolyte circulation and updating effect in the machining area, improve the machining efficiency, ensure the machining precision and surface quality, and enable the ultrasonic vibration to be concentrated and transmitted to the machining area of the workpiece, thereby reducing the energy loss.

[0007] To achieve the above purpose, the present application provides the following solutions:

[0008] The present application provides a rotary ultrasonic vibration assisted electrolytic machining system, which comprises a machine tool spindle, a conductive slip ring, an ultrasonic generator, an electrolytic direct current power supply and an ultrasonic vibration device, wherein the ultrasonic vibration device comprises a spindle connecting rod, an ultrasonic vibrator, a conductive rubber sleeve, an amplitude varying rod, a cathode rod and a cathode head.

[0009] The stator of the conductive slip ring is fixed on the machine tool, and the stator terminals are connected to the positive and negative poles of the ultrasonic generator respectively.

[0010] The main shaft connecting rod is coaxially fixed on the machine tool main shaft, the amplitude bar is fixed on the main shaft connecting rod and fixedly connected with the ultrasonic vibrator, the lower end of the main shaft connecting rod is connected with the upper end of the cathode rod through the conductive rubber sleeve, and the cathode head is fixed on the lower end of the cathode rod.

[0011] The main shaft connecting rod, the conductive rubber sleeve, the cathode rod and the cathode head are internally communicated to form an electrolyte flow channel.

[0012] The positive pole of the electrolytic DC power supply is connected with the workpiece, and the negative pole is connected with the machine tool main shaft.

[0013] Preferably, an insulating sleeve is arranged between the rotor of the conductive slip ring and the machine tool main shaft.

[0014] Preferably, the amplitude bar is a V-shaped amplitude bar, and the ultrasonic vibrator is distributed at the upper two ends of the V-shaped amplitude bar.

[0015] Preferably, the surface of the amplitude bar is subjected to black oxidation treatment.

[0016] Preferably, an insulating layer is coated on the outer surface of the amplitude bar.

[0017] Preferably, insulating ceramics are arranged between the amplitude bar and the cathode rod, and between the amplitude bar and the main shaft connecting rod.

[0018] Preferably, the shell of the conductive slip ring, the main shaft connecting rod, the cathode rod and the cathode head are made of corrosion-resistant metal materials.

[0019] The present application provides a rotary ultrasonic vibration assisted electrolytic machining method based on the above-mentioned rotary ultrasonic vibration assisted electrolytic machining system, comprising the following steps:

[0020] Step 1: Fix the workpiece in the machining area, move the X-axis and Y-axis of the machine tool, so that the cathode head is at the predetermined machining position of the workpiece, then adjust the Z-axis to determine the initial machining gap between the cathode head and the workpiece.

[0021] Step two: connect the machine spindle to the negative pole of the electrolytic DC power supply, connect the workpiece to the positive pole of the electrolytic DC power supply, open the valve, and the electrolyte is sprayed from the cathode head through the machine spindle, the spindle connecting rod, the conductive rubber sleeve and the cathode rod, and acts on the surface of the workpiece;

[0022] Step three: turn on the ultrasonic generator, and the vibration generated by the ultrasonic vibrator is transmitted to the cathode rod through the amplitude rod, and further transmitted to the cathode head, so that the cathode head generates longitudinal ultrasonic vibration;

[0023] Step four: turn on the electrolytic DC power supply, run the machine tool processing program, and the machine spindle rotates while moving in the feeding direction, realizing ultrasonic vibration assisted electrolytic machining.

[0024] The present application has the following technical effects compared with the prior art:

[0025] In the working process of the present application, the electrolyte is sprayed from the cathode head through the machine spindle, the spindle connecting rod, the conductive rubber sleeve and the cathode rod, and acts on the surface of the workpiece, the conductive slip ring ensures that the ultrasonic vibration device and the machine spindle rotate synchronously, realizes the rotation ultrasonic vibration of the spindle and the central liquid supply, adopts the central liquid supply (internal liquid injection) to better control the flow of electrolyte, forces the electrolyte in the machining gap to exchange with the outside world, improves the electrolyte circulation and updating effect of the machining area, thereby taking away the machining products and the generated heat, improves the machining efficiency, and ensures the machining precision and surface quality. The present application adopts a segmented tool electrode design, the cathode rod is connected to the spindle connecting rod through the conductive rubber sleeve, which can inhibit the transmission of amplitude upward, concentrate the ultrasonic vibration to the workpiece machining area, and reduce the energy loss.

[0026] Further, the amplitude rod is arranged as a V-shaped amplitude rod, the cathode rod is connected to the lower end of the V-shaped amplitude rod, and the lower end faces of the two sides of the V-shaped amplitude rod can obtain smaller horizontal spacing, so that the vibration of the two ultrasonic vibrators is more easily concentrated in the central machining area, has the effect of transmitting vibration to the center, concentrates the amplitude in the workpiece machining area, reduces the vibration energy loss, and improves the vibration effect. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The structure diagram of the rotary ultrasonic vibration assisted electrolytic machining system in the embodiments of the present application;

[0029] Figure 2 is Figure 1 a partial enlarged view of part A in the figure;

[0030] Figure 3 is Figure 1 a partial enlarged view of part B in the figure;

[0031] Figure 4 is the admittance circle diagram of the ultrasonic vibrator in the embodiment of the application;

[0032] Figure 5 is the impedance curve diagram of the ultrasonic vibrator in the embodiment of the application;

[0033] Figure 6 is the cathode head end face amplitude diagram in the embodiment of the application;

[0034] Figure 7 is the simulation vibration mode diagram of the main shaft connecting rod and the cathode rod in the embodiment of the application in a split layout and connected through a conductive rubber sleeve;

[0035] Figure 8 is the vibration mode diagram of the main shaft connecting rod and the cathode rod in an integrated layout.

[0036] In the figure: 1-main shaft rotation direction, 2-machine tool main shaft, 3-conductive slip ring, 4-main shaft connecting rod, 5-ultrasonic vibrator, 6-conductive rubber sleeve, 7-amplifying rod, 71-connection part, 8-cathode rod, 9-insulating ceramic, 10-cathode head, 11-main shaft feeding direction, 12-workpiece, 13-ultrasonic wave generator, 14-electrolyte, 15-ultrasonic vibration direction, 16-electrolysis product, 17-electrolysis direct current power supply, 18-electrolyte flow channel, 19-pressing nut. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0038] The purpose of the application is to provide a rotary ultrasonic vibration assisted electrolytic machining system and method to solve the problems in the prior art, improve the electrolyte circulation and updating effect in the machining area, improve the machining efficiency, ensure the machining precision and surface quality, and enable the ultrasonic vibration to be concentrated and transmitted to the workpiece machining area, thereby reducing energy loss.

[0039] In order to make the above-mentioned purposes, characteristics and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0040] Example 1

[0041] like Figures 1-3 As shown, this embodiment provides a rotary ultrasonic vibration assisted electrolytic machining system, including a machine tool spindle 2, a conductive slip ring 3, an ultrasonic generator 13, an electrolytic DC power supply 17 and an ultrasonic vibration device, the ultrasonic vibration device including a spindle connecting rod 4, an ultrasonic vibrator 5, a conductive rubber sleeve 6, a horn 7, a cathode rod 8 and a cathode head 10;

[0042] The stator of the conductive slip ring 3 is fixed on the machine tool, and the stator terminals are connected to the positive and negative poles of the ultrasonic generator 13 respectively. The rotor of the conductive slip ring 3 is fixed on the machine tool spindle 2, and the rotor terminals are connected to the positive and negative poles of the ultrasonic vibrator 5 respectively.

[0043] The spindle connecting rod 4 is coaxially fixed to the machine tool spindle 2, the horn 7 is fixed to the spindle connecting rod 4 and fixedly connected to the ultrasonic vibrator 5, the lower end of the spindle connecting rod 4 is connected to the upper end of the cathode rod 8 through the conductive rubber sleeve 6, and the cathode head 10 is fixed to the lower end of the cathode rod 8; the lower end of the horn 7 is connected to the cathode rod 8, and is used to transmit vibration to the cathode head 10 through the cathode rod 8;

[0044] The main shaft connecting rod 4, the conductive rubber sleeve 6, the cathode rod 8 and the cathode head 10 are internally connected to form an electrolyte flow channel 18;

[0045] The positive electrode of the electrolytic DC power supply 17 is connected to the workpiece 12 , and the negative electrode is connected to the machine tool spindle 2 .

[0046] During operation, electrolyte flows through the machine spindle 2, spindle connecting rod 4, conductive rubber sleeve 6, and cathode rod 8, ejecting from cathode head 10 onto the workpiece surface. Conductive slip ring 3 ensures synchronous rotation of the ultrasonic vibration device and the machine spindle 2, achieving ultrasonic vibration and central liquid supply. An electrolytic DC power supply 17 provides electrical energy to meet the requirements of high-intensity energy fields and efficient machining. The ultrasonic vibrator 5 (i.e., ultrasonic transducer) converts the high-frequency electrical oscillation signal generated by the ultrasonic generator 13 into high-frequency mechanical vibration. The amplitude is amplified by the horn 7 and transmitted to the cathode head 10, causing the tool electrode to generate high-frequency vibration, thus achieving ultrasonic vibration-assisted electrolytic machining.

[0047] This system utilizes a central fluid supply to force the electrolyte in the machining gap to exchange with the outside world, improving the electrolyte circulation and renewal effect in the machining area. It can promptly discharge the insoluble products in the machining gap to ensure the normal progress of electrolysis. It can also promptly remove the heat generated by electrolysis to prevent heat accumulation in the machining area, thereby improving machining efficiency and ensuring machining accuracy and surface quality. It is particularly suitable for machining deep grooves or deep holes.

[0048] During the machining process, the electrolytic product 16 is forced to move under the ultrasonic cavitation, constantly micro-polishing the machining surface, and timely removing the oxide film on the surface of the workpiece 12 due to anodic oxidation, thereby improving the efficiency and surface quality of the electrochemical machining. The cavitation of the ultrasonic wave is also conducive to the circulation and update of the electrolyte, and carries away excessive electrolytic product 16, thereby improving the surface quality of the electrochemical machining.

[0049] In order to transmit most of the amplitude to the machining area and reduce the vibration energy loss, the main shaft connecting rod 4 and the cathode rod 8 are connected by the conductive rubber sleeve 6. The conductive rubber sleeve 6 has the functions of electrolyte transmission and electrical conduction. If a common rubber tube is used, the main shaft connecting rod 4 and the cathode rod 8 are not directly connected, but there is a potential difference, which will cause the cathode rod 8 to be corroded by electrolysis. The main shaft connecting rod 4 and the cathode rod 8 are connected by the conductive rubber sleeve 6, which has three considerations: first, it is equivalent to reducing the length of the cathode rod 8, thereby reducing the weight of the cathode rod 8 and making it easier to vibrate; second, it is convenient for assembly. If the two are integrated, the insulating ceramic and the nut will be difficult to install; third, it suppresses the transmission of amplitude upward and reduces the vibration energy loss.

[0050] As shown in Figure 7 , it is a simulation mode diagram of the main shaft connecting rod 4 and the cathode rod 8 in a split layout and connected by the conductive rubber sleeve 6, Figure 8 , it is a vibration mode diagram of the main shaft connecting rod 4 and the cathode rod 8 in an integrated layout. The peak voltage of the simulation of the two is 200V.

[0051] Figure 7 The characteristic frequency of the ultrasonic vibration device in the present application is 42673Hz, and the amplitude peak value of the end surface of the cathode head 10 is 23.283μm; while Figure 8 , the characteristic frequency is 42145Hz, and the amplitude peak value of the end surface of the cathode head 10 is 15.347μm (the characteristic frequency of the device is related to its own structure). In Figure 8 , the middle part of the amplitude rod 7 has a very obvious vibration, indicating that the vibration loss is very large; while in Figure 7 , the vibration basically stays in the lower half of the conductive rubber sleeve 6, and the vibration loss is much smaller than that in Figure 8 . Therefore, by separating the main shaft connecting rod 4 and the cathode rod 8 and connecting them with the conductive rubber sleeve 6, the vibration loss can be greatly reduced, and the amplitude of the end surface of the cathode head can be improved.

[0052] The main shaft connecting rod 4 is connected with the machine tool main shaft 2 through the water stop clamp and the nut, and is fixed on the amplitude lever 7 through the compression nut 19. Specifically, the connecting part 71 is integrally arranged in the middle of the amplitude lever 7, the top of the connecting part 71 is sleeved on the bottom of the main shaft connecting rod 4, and the connecting part 71 is compressed on the step of the bottom of the main shaft connecting rod 4 through the compression nut 19. In order to prevent the ultrasonic generator 13 from interfering with the electrolytic direct current source 17, thereby affecting the processing, the system is provided with an insulating sleeve, such as an epoxy resin sleeve, between the rotor of the conductive slip ring 3 and the machine tool main shaft 2, so that the conductive slip ring 3 and the machine tool main shaft 2 are kept insulated; an insulating layer, such as a resin insulating layer, is coated on the outer surface of the amplitude lever 7; the insulating ceramic 9 is arranged between the amplitude lever 7 and the cathode rod 8 and the cathode head 10, and a certain gap is left between the amplitude lever 7 and the cathode rod 8, the amplitude lever 7 is compressed and fixed between the two insulating ceramics 9 by the cathode head 10, and the amplitude lever 7 and the two insulating ceramics 9 are compressed on the step at the bottom of the cathode rod 8, so that the amplitude lever 7 and the cathode rod 8 and the cathode head 10 are kept insulated; the insulating ceramic 9 is arranged between the amplitude lever 7 and the main shaft connecting rod 4, and a certain gap is left between them, and the insulating ceramic 9 is arranged between the amplitude lever 7 and the compression nut 19, the amplitude lever 7 is compressed and fixed between the two insulating ceramics 9 by the compression nut 19, so that the amplitude lever 7 and the main shaft connecting rod 4 are kept insulated; the amplitude lever 7 is arranged as a V-shaped amplitude lever, the ultrasonic transducers 5 are distributed at the two ends of the upper part of the V-shaped amplitude lever, and the ultrasonic transducers 5 at the two ends are connected in parallel to prevent the electrolyte in the tube electrode from seeping into the ultrasonic transducers 5 and causing short circuit. The system insulates the tool electrode and the amplitude lever 7, so that the current of the two does not interfere with each other, and a larger processing voltage can be applied.

[0053] The system is used for electrolytic processing, and the neutral salt solution used in processing and the salt mist generated have certain corrosive properties, so the device is required to have corrosion resistance. The shell of the conductive slip ring 3, the main shaft connecting rod 4, the cathode rod 8 and the cathode head 10 are made of corrosion-resistant metal materials, such as stainless steel; the surface of the amplitude lever 7 is black oxide treated, and an insulating layer is coated after the black oxide treatment; the black oxide treatment is mainly to prevent the salt solution from rusting the amplitude lever 7, and the insulating layer is to prevent the electrolyte from splashing into the gap between the insulating ceramic 9, the cathode rod 8 and the amplitude lever 7, thereby reducing the insulation performance, which is a safety measure, and the insulating layer also has the function of preventing rust.

[0054] The amplitude of the cathode head 10 can be adjusted by adjusting the power of the ultrasonic generator 13 and changing the specifications of the ultrasonic transducers 5.

[0055] The cathode head 10 in the system can be customized to different shapes and sizes according to the processing requirements.

[0056] Figure 4 is the admittance circle diagram of the ultrasonic transducer 5 in the system, Figure 5is the impedance curve of the ultrasonic vibrator 5 in the system. The assembly state of the ultrasonic vibrator 5 and the amplitude rod 7 can be judged according to the roundness of the admittance circle. As can be seen from the figure, the roundness of the admittance circle of the ultrasonic vibrator 5 is very regular, indicating that the assembly between the ultrasonic vibrator 5 and the amplitude rod 7 is good and the work is stable. The Q m represents the electromechanical quality factor, which is the ratio of the resonant frequency of the vibrator to the bandwidth, and is used to measure the damping characteristics and frequency selectivity of the vibrator. High quality factor means that the vibrator energy loss is slow and the vibration can last for a long time. The Q m of the ultrasonic vibrator in the figure reaches 1064.1, indicating that the vibration loss is extremely small and can meet the demand of ultrasonic vibration.

[0057] Figure 6 is the end surface amplitude diagram of the cathode head 10 in the system. The test voltage peak-to-peak value is 200V, the working frequency is 41847Hz, the length of the cathode head 10 is 20mm, and the measured amplitude peak-to-peak value is 6.3μm. If you want to increase the amplitude of the cathode head 10, you can increase the test voltage and appropriately reduce the length of the cathode head 10 in the future.

[0058] Example Two

[0059] The embodiment provides a rotary ultrasonic vibration assisted electrolytic machining method based on the rotary ultrasonic vibration assisted electrolytic machining system described in Example One, which comprises the following steps:

[0060] Step One: Fix the workpiece in the machining area, move the X axis and Y axis of the machine tool, so that the cathode head 10 is at the predetermined machining position of the workpiece, then adjust the Z axis to determine the initial machining gap between the cathode head 10 and the workpiece;

[0061] Step Two: Connect the machine tool spindle to the negative electrode of the electrolytic DC power supply 17, connect the workpiece to the positive electrode of the electrolytic DC power supply 17, open the valve, and the electrolyte is sprayed out from the cathode head 10 through the machine tool spindle 2, the spindle connecting rod 4, the conductive rubber sleeve 6 and the cathode rod 8, and acts on the surface of the workpiece;

[0062] Step Three: Turn on the ultrasonic generator 13, and the vibration generated by the ultrasonic vibrator 5 is transmitted to the cathode rod 8 through the amplitude rod 7, and further transmitted to the cathode head 10, so that the cathode head 10 generates longitudinal ultrasonic vibration;

[0063] Step Four: Turn on the electrolytic DC power supply 17, run the machine tool machining program, and the machine tool spindle 2 rotates while moving along the feed direction, realizing ultrasonic vibration assisted electrolytic machining.

[0064] In Step One, the initial machining gap should not be too large, otherwise the electric field between the cathode and the workpiece will be weakened, the machining current will be small, and the machining efficiency will be reduced. At the same time, it should not be too small, otherwise the machining product and the electrolyte are difficult to discharge, thereby affecting the machining precision.

[0065] In the electrochemical machining process, when the tool cathode feed amount is equal to the workpiece anode removal amount, the gap between the tool and the workpiece remains unchanged, which is called the balance gap. When the initial machining gap is greater than the balance gap, the tube electrode end surface current is small, and the anode workpiece material removal amount is less than the tool feed amount, resulting in a gradually decreasing machining gap and a gradually increasing current until the balance gap is reached; vice versa.

[0066] Generally speaking, during the transition of the initial machining gap to the balance gap, the current has an upward / downward trend, resulting in changes in the machining size, which is unacceptable for high-precision machining, so the initial machining gap should be as close to the balance gap as possible. The initial machining gap is generally 0.1-0.5mm.

[0067] In the present application, specific examples are applied to illustrate the principles and implementation modes of the present application. The above examples are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation mode and application range. In summary, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A system for rotary ultrasonic vibration assisted electrochemical machining, characterized by: The machine tool spindle, the conductive slip ring, the ultrasonic generator, the electrolytic DC power supply and the ultrasonic vibration device are included, and the ultrasonic vibration device includes the spindle connecting rod, the ultrasonic vibrator, the conductive rubber sleeve, the amplitude varying rod, the cathode rod and the cathode head. The stator of the conductive slip ring is fixed on the machine tool, and the stator connection terminals are connected to the positive and negative poles of the ultrasonic generator respectively. The spindle connecting rod is coaxially fixed on the machine tool spindle, the amplitude varying rod is fixed on the spindle connecting rod and is fixedly connected with the ultrasonic vibrator, the spindle connecting rod and the cathode rod adopt a split structure, the lower end of the spindle connecting rod is connected with the upper end of the cathode rod through the conductive rubber sleeve, the conductive rubber sleeve is used for inhibiting the transmission of amplitude upward and reducing the vibration energy loss, and the cathode head is fixed on the lower end of the cathode rod. The spindle connecting rod, the conductive rubber sleeve, the cathode rod and the cathode head are internally communicated to form an electrolyte flow channel. The positive pole of the electrolytic DC power supply is connected with the workpiece, and the negative pole is connected with the machine tool spindle. The amplitude varying rod is a V-shaped amplitude varying rod, and the ultrasonic vibrators are distributed at the two ends of the upper portion of the V-shaped amplitude varying rod, and the ultrasonic vibrators at the two ends are connected in parallel.

2. The rotary ultrasonic vibration assisted electrochemical machining system of claim 1, wherein: An insulating sleeve is arranged between the rotor of the conductive slip ring and the machine tool spindle.

3. The rotary ultrasonic vibration assisted electrochemical machining system of claim 1, wherein: The surface of the amplitude varying rod is subjected to black oxidation treatment.

4. The rotary ultrasonic vibration assisted electrochemical machining system of claim 1, wherein: An insulating layer is coated on the outer surface of the amplitude varying rod.

5. The rotary ultrasonic vibration assisted electrochemical machining system of claim 1, wherein: Insulating ceramics are arranged between the amplitude varying rod and the cathode rod and between the amplitude varying rod and the spindle connecting rod.

6. The rotary ultrasonic vibration assisted electrochemical machining system of claim 1, wherein: The shell of the conductive slip ring, the spindle connecting rod, the cathode rod and the cathode head adopt corrosion-resistant metal materials.

7. A method of rotary ultrasonic vibration assisted electrochemical machining characterized by: The rotary ultrasonic vibration assisted electrolytic machining system based on any one of claims 1-6 comprises the following steps: Step one: fixing the workpiece in the machining area, moving the X-axis and Y-axis of the machine tool, so that the cathode head is at the predetermined machining position of the workpiece, and then adjusting the Z-axis to determine the initial machining gap between the cathode head and the workpiece; Step two: connecting the machine tool spindle to the negative pole of the electrolytic DC power supply, connecting the workpiece to the positive pole of the electrolytic DC power supply, opening the valve, and spraying the electrolyte from the cathode head through the machine tool spindle, the spindle connecting rod, the conductive rubber sleeve and the cathode rod to act on the surface of the workpiece; Step three: turning on the ultrasonic generator, and transmitting the vibration generated by the ultrasonic vibrator to the cathode rod through the amplitude varying rod, and further transmitting the vibration to the cathode head, so that the cathode head generates longitudinal ultrasonic vibration; Step four: turning on the electrolytic DC power supply, running the machine tool machining program, and rotating the machine tool spindle while moving along the feed direction to realize ultrasonic vibration assisted electrolytic machining.

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