Deep hole electrochemical machining device and method

Abstract

The application discloses a deep hole electrolytic machining device and method, and relates to the technical field of machining, and in particular relates to a deep hole electrolytic machining device and method. The structure comprises a base and a tube electrode, the tube electrode is connected with an electrolyte tank, the electrolyte tank is internally provided with electrolyte, the electrolyte flows to the surface of a workpiece through the tube electrode; in addition, the structure further comprises a power supply, the negative electrode of the power supply is electrically connected with the tube electrode, the positive electrode of the power supply is electrically connected with the workpiece, the outer periphery of the tube electrode is sleeved with a suction main body, a sealing structure is arranged on the contact surface between the suction main body and the workpiece, and the suction main body is used for sucking out the electrolyte in the deep hole. The application can adjust the pressure in the inner cavity of the suction main body through the suction main body, can limit the electrolyte flowing area, can improve the machining localization, can form a low-pressure or negative pressure environment in the suction main body, can accelerate the discharge of the electrolyte and electrolytic products from the machining hole, and can avoid the tube electrode from being blocked by the electrolytic products.

Description

Technical Field

[0001] This invention relates to the technical field of hole processing in equipment and structures, and more specifically, to a deep hole electrolytic machining apparatus and method. Background Technology

[0002] Tube electrode electrochemical machining is a machining process that uses a hollow metal tube as the cathode to electrochemically etch away the anode of a workpiece. The demand for machining micro-single holes, groups of holes, and oblique holes is gradually increasing in aerospace, shipbuilding, and chemical industries. These hole structures are often characterized by small diameters, large numbers, and varied angles with the normal direction of the part surface. Furthermore, the hole shapes are diverse, and they are often made of difficult-to-machine materials. Microcracks and recast layers are not allowed on the machined surface, posing a severe challenge to hole manufacturing technology. Taking aero-engines as an example, their materials are mostly high-temperature alloys, titanium alloys, and intermetallic compounds, making their machining extremely difficult. Numerous micro-holes and groups of holes exist, such as turbine blade film cooling holes, combustion chamber flame tube groups, engine fuel injection holes, and various types of holes on turbine stator blades. The hole diameters are generally between 0.3-2 mm, while the depth-to-diameter ratio can exceed 50. How to achieve efficient, high-quality, and high-precision machining of these hole structures has become a research hotspot in the scientific and engineering communities both domestically and internationally.

[0003] Traditional tubular electrode electrolytic machining of small holes, especially deep holes with a large depth-to-diameter ratio, still has some problems. Mainly, as the machining depth increases, the electrolyte suffers significant kinetic energy loss during movement, resulting in a marked decrease in flow velocity within the machining gap and a corresponding reduction in electrolyte renewal efficiency. Low efficiency in the removal of electrolytic products also increases the risk of short circuits, leading to poor surface finish and low machining efficiency.

[0004] A suction-type tubular electrode micro-deep hole electrolytic machining device is available, comprising an electrolyte storage device, an electrolyte supply and recovery device, a worktable, a leveling experimental table, and a suction-type tubular electrode assembly. The workpiece is clamped and the initial machining gap is adjusted, then the electrolyte supply parameters are adjusted to achieve the electrolytic machining effect. This device achieves the suction effect by changing the tubular electrode, a clever approach. However, the device's inner diameter is only 0.3 mm, requiring high precision in the tubular electrode manufacturing; the feed rate is 0.2 mm / min, resulting in low machining efficiency in actual operation; furthermore, the tubular electrode has a double-layer structure, making it difficult to obtain and economically unfeasible. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of existing suction processing electrolytic devices, such as high requirements for the fabrication of tube electrodes, high processing difficulty, low processing efficiency, and low economic efficiency. This invention provides a deep hole electrolytic processing device and method that can improve processing localization, reduce the processing hole diameter, accelerate the discharge of electrolyte, improve processing efficiency and accuracy, and significantly reduce electrolytic processing costs.

[0006] To address the aforementioned technical problems, this invention provides a deep-hole electrolytic machining apparatus, comprising a base for placing a workpiece, and a tubular electrode capable of moving along the workpiece surface and its normal direction (i.e., moving along the X, Y, and Z axes on the workpiece surface). The tubular electrode is connected to an electrolyte tank containing electrolyte, which flows through the tubular electrode to the workpiece surface. Furthermore, it includes a power supply, with its negative terminal electrically connected to the tubular electrode and its positive terminal electrically connected to the workpiece. A suction body is fitted around the outer periphery of the tubular electrode, and a sealing structure is provided on the contact surface between the suction body and the workpiece. When the suction body is tightly fitted to the workpiece, a sealed environment is formed. By creating a low-pressure or negative-pressure environment within the suction body, the time it takes for the electrolyte to be drawn out of the deep hole is reduced, preventing the electrolyte from remaining in the machined deep hole for an extended period.

[0007] Furthermore, the low-pressure or negative-pressure environment within the suction body is achieved through the following structure: the suction body is connected to a vacuum tube, the suction body has an inner cavity, one end of the vacuum tube is sealed to the inner cavity, and the other end is connected to a vacuum tank, the vacuum tank is connected to a vacuum pump, and a transition cavity is provided on the vacuum tube. The transition cavity, formed by the vacuum tank drawing gas and liquid from the inner cavity of the suction body, serves to ensure that when liquid is drawn from the vacuum tube, the liquid first flows into the transition cavity and then from the transition cavity through another vacuum tube to the vacuum tank. The transition cavity acts as a buffer in this process, preventing unstable suction pressure caused by direct connection through the vacuum tube, which could affect the electrolytic processing quality. A pneumatic vacuum filter is installed between the vacuum pump and the vacuum tank, and the pneumatic vacuum filter contains a replaceable filter element.

[0008] Furthermore, the suction body has a first through hole and a second through hole on two sides along the length of the tube electrode. The suction body has an inner liner inside, which is fixedly connected to the plane where the first through hole is located on the suction body. The end of the inner liner near the second through hole is suspended and a third through hole is provided on the end face, which is concentric with the first or second through hole. The tube electrode passes through the first through hole, the second through hole and the third through hole.

[0009] Furthermore, the plane where the first through hole is located is also provided with a first recessed portion, which is circular and concentrically arranged with the first through hole.

[0010] Furthermore, the plane containing the second through hole also has a second recess, which is annular and concentrically positioned with the second through hole. The sealing structure is disposed within the second recess.

[0011] Furthermore, a vacuum hole is provided on the side of the suction body along the radial direction of the tube electrode, and the vacuum tube is connected to the inner cavity of the suction body through the vacuum hole.

[0012] Furthermore, at least two vacuum holes are provided, with at least one vacuum hole located near the top surface of the suction body and at least one vacuum hole located near the bottom surface of the suction body. As a preferred embodiment, four vacuum holes are provided in total, distributed on the four sides of the suction body. Two opposing vacuum holes are closer to the bottom of the suction body, while the other two opposing vacuum holes are closer to the top surface of the suction body. The purpose of this arrangement is that the two lower vacuum holes are primarily used to suction the electrolyte (i.e., the electrolyte after electrolytic processing) from the inner cavity, while the two upper vacuum holes are used to extract gas from the inner cavity, maintaining a low-pressure or negative-pressure state within the suction body's inner cavity and accelerating the electrolyte suction rate.

[0013] Furthermore, vacuum tubes are sealed and connected to opposite sides of the transition cavity, and a first pressure monitoring device is also provided on the transition cavity for monitoring its internal pressure parameters. The first pressure monitoring device is preferably a pressure gauge with a range of 0-60 MPa and an accuracy class of 2.5.

[0014] Furthermore, three small holes are provided on one side of the vacuum chamber, which are respectively connected to an inlet valve, an outlet valve, and a second pressure monitoring device. The vacuum chamber can be made of 304 stainless steel, while the lid can be made of acrylic sheet or other transparent and sturdy materials to facilitate observation of the inside of the vacuum chamber. The three small holes can be located on the lid of the vacuum chamber, and a silicone gasket is used to seal the chamber body and the lid.

[0015] On the other hand, the present invention also provides a deep hole electrolytic machining method, comprising the following steps:

[0016] Step S1: Fix the workpiece on the base, connect the liquid inlet end of the tube electrode to the electrolyte tank containing the electrolyte, connect the negative terminal of the power supply to the tube electrode, connect the positive terminal of the power supply to the workpiece, and put the suction body on the tube electrode.

[0017] Step S2: Move the moving tube electrode toward the workpiece and maintain a machining gap of 100-300 micrometers with the workpiece;

[0018] Step S3: Turn on the vacuum pump. After the pressure inside the vacuum tank reaches the preset value, drive the electrolyte tank so that the electrolyte flows in from the inlet end of the tube electrode and sprays out from the outlet end, and fills the suction body with electrolyte.

[0019] Step S4: Start the power supply to perform electrolytic processing;

[0020] Step S5: After processing is completed, turn off the power and stop driving the electrolyte tank. After the negative pressure inside the suction body disappears, turn off the deep hole electrolytic processing device and take out the suction body and the workpiece.

[0021] The beneficial effects of this invention are:

[0022] 1. At the start of processing, the pressure in the inner cavity of the suction body can be adjusted by a vacuum pump, which can limit the flow area of ​​the electrolyte, guide the electrolyte, improve the localization of processing, and help reduce the processing hole diameter;

[0023] 2. During the processing, by creating a low-pressure or negative-pressure environment inside the suction body, the electrolyte and electrolysis products are accelerated to be discharged from the processing hole, avoiding the tube electrode from being blocked by electrolysis products and reducing the corrosion of the hole sidewall and workpiece surface by the electrolyte, thereby improving the accuracy and efficiency of electrolytic machining. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a deep hole electrolytic machining apparatus;

[0025] Figure 2 This is a schematic diagram of the overall structure of the suction unit;

[0026] Figure 3 This is a structural diagram of the suction body from another angle;

[0027] Figure 4 This is a schematic diagram of the internal structure of the suction unit;

[0028] Figure 5 A reference diagram showing the state of the suction body during the machining of the electrode assembly;

[0029] Figure 6 This is a flowchart of the deep hole electrolytic machining method.

[0030] In the attached image:

[0031] 1-Base; 2-Tube electrode; 3-Electrolyte tank; 4-Power supply; 5-Suction body; 501-First through hole; 502-Second through hole; 503-Inner liner; 504-Third through hole; 6-Vacuum tank; 7-Vacuum pump; 8-Transition chamber; 9-Workpiece; 10-First recess; 11-Strip groove; 12-Second recess; 13-Vacuum hole; 14-First pressure monitoring device; 15-Second pressure monitoring device; 16-Pneumatic vacuum filter; 17-Guide part; 18-Moving part; 19-Supply pump; 20-Valve; 21-Loading platform; 22-First vacuum tube; 23-Second vacuum tube; 24-Third vacuum tube. Detailed Implementation

[0032] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0033] In the accompanying drawings of this invention, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that terms such as "front," "rear," "left," and "right," indicating orientation or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, descriptions involving "first," "second," etc., in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0034] Example 1:

[0035] See Figure 1 This embodiment provides a deep hole electrolytic machining apparatus, including a base 1 for placing a workpiece 9, and a tube electrode 2 capable of moving along the surface of the workpiece 9 and the normal to the surface (i.e., moving along the X, Y, and Z directions on the surface of the workpiece 9). The tube electrode 2 is connected to an electrolyte tank 3, which contains electrolyte that flows through the tube electrode 2 to the surface of the workpiece 9. The main function of the base 1 is to level the workpiece 9, placing it in a horizontal position to facilitate electrolytic machining by the tube electrode 2. A loading platform 21 is also provided between the base 1 and the workpiece 9. The loading platform 21 can move horizontally along the X-axis and Y-axis directions, thereby moving the workpiece 9 horizontally. The tube electrode 2 is clamped on a guide part 17, which is connected to the output end of a moving part 18. The output end of the moving part 18 can move vertically, thereby driving the guide part 17 and the tube electrode 2 to move in the Z-axis direction. The tubular electrode 2 is a common structure in the prior art, with one end being the liquid inlet and the other end being the liquid outlet. The liquid inlet is connected to the electrolyte tank 3 via an inlet pipe, which is equipped with a liquid supply pump 19 and a valve 20. When the valve 20 is opened, the electrolyte can be transported from the electrolyte tank 3 to the tubular electrode 2 under the drive of the liquid supply pump 19 to participate in the electrolytic processing.

[0036] In addition, a power supply 4 is included. The negative terminal of the power supply 4 is electrically connected to the tube electrode 2, and the positive terminal of the power supply 4 is electrically connected to the workpiece 9. A suction body 5 is fitted around the outer periphery of the tube electrode 2. The suction body 5 is also connected to a vacuum tube. The suction body 5 forms an inner cavity. One end of the vacuum tube is sealed to the inner cavity, and the other end is connected to a vacuum tank 6. The vacuum tank 6 is connected to a vacuum pump 7. A transition cavity 8 is provided on the vacuum tube. The gas and liquid in the inner cavity of the suction body 5 are suctioned by the vacuum tank 6 and the vacuum pump 7 to create a low-pressure or negative-pressure environment in the inner cavity. This accelerates the speed at which the electrolyte is ejected from the liquid outlet of the tube electrode 2 and allows the electrolyte to be drawn out from the machining hole, preventing the electrolyte from clogging the machining hole. The function of the transition cavity 8 is that when the liquid is extracted using the vacuum tube, the liquid will first flow into the transition cavity 8, and then flow from the transition cavity 8 through another vacuum tube to the vacuum tank 6. The transition cavity 8 plays a buffering role in this process, avoiding unstable suction pressure caused by direct connection through the vacuum tube, which would affect the quality of electrolytic machining.

[0037] Example 2:

[0038] See Figure 6 This embodiment provides a deep hole electrolytic machining method, using the deep hole electrolytic machining apparatus provided in Embodiment 1. The method includes the following steps:

[0039] Step S1: Fix the workpiece 9 on the loading platform 21, which is located on the base 1. Connect the liquid inlet end of the tube electrode 2 to the electrolyte tank 3 containing the electrolyte. Connect the negative terminal of the power supply 4 to the tube electrode 2 and the positive terminal of the power supply 4 to the workpiece 9. Connect the suction body 5 to the transition chamber 8 and the transition chamber 8 to the vacuum tank 6 with a vacuum tube. Then, put the suction body 5 on the tube electrode 2.

[0040] Step S2: Move the moving tube electrode 2 toward the workpiece 9 and maintain a machining gap of 100-300 micrometers with the workpiece 9;

[0041] Step S3: Turn on the vacuum pump 7. After the internal pressure of the vacuum tank 6 reaches the preset value, drive the electrolyte tank 3 so that the electrolyte flows in from the inlet end of the tube electrode 2 and sprays out from the outlet end, and fills the inner cavity of the suction body 5, the transition cavity 8 and the vacuum tube with electrolyte.

[0042] Step S4: Start power supply 4 to perform electrolytic processing;

[0043] Step S5: After processing is completed, turn off the power supply 4 and vacuum pump 7 and stop driving the electrolyte tank 3. After the pressure inside the vacuum tank 6 drops to 0, the negative pressure environment inside the suction body 5 disappears. Then, turn off the deep hole electrolytic processing device and take out the suction body 5 and the workpiece 9.

[0044] Example 3:

[0045] like Figures 1 to 5 As shown, this embodiment provides another deep-hole electrolytic machining apparatus. Based on Embodiment 1, the suction body 5 in this embodiment has a first through hole 501 and a second through hole 502 on two opposing sides along the length of the tube electrode 2, wherein the first through hole 501 is located at the top of the suction body 5. In addition, an inner liner 503 is provided in the inner cavity of the suction body 5. The inner liner 503 is fixedly connected to the top surface of the suction body 5 where the first through hole 501 is located. The bottom end of the inner liner 503 is suspended, and a third through hole 504 is provided on the bottom surface of the inner liner 503. The first through hole 501, the second through hole 502, and the third through hole 504 are concentrically arranged, and the tube electrode 2 passes through the first through hole 501, the second through hole 502, and the third through hole 504.

[0046] The inner liner 503 is used to house the guide portion 17, and the inner diameter of the inner liner 503 is 8mm.

[0047] The top surface of the suction body 5, where the first through hole 501 is located, is provided with a first recess 10. The first recess 10 is circular, with a diameter of 25 mm and a depth of 2 mm. The first recess 10 is used to place the first sealing gasket (not shown in the figure). The first recess 10 is concentrically arranged with the first through hole 501, which has a diameter of 8 mm, consistent with the inner diameter of the inner liner 503.

[0048] The bottom surface of the suction body 5, where the second through hole 502 is located, is provided with a second recess 12. The second recess 12 is annular in shape and concentrically arranged with the second through hole 502. The second recess 12 has an inner diameter of 8 mm, an outer diameter of 25 mm, and a depth of 2 mm. The second recess 12 is used to place a second sealing gasket (not shown in the figure). The second through hole 502 is used for the extension of the tube electrode 2 and requires sufficient space for the electrolyte to pass through. Therefore, the diameter of the second through hole 502 is slightly larger than that of the third through hole 504, which simply allows the tube electrode 2 to pass through. In this embodiment, the diameter of the second through hole 502 is 1 mm.

[0049] The top surface of the suction body 5 is also provided with a vertical plate perpendicular to the top surface. The vertical plate can be set on the opposite two edges, or on three of the edges of the top surface. Each of the opposite two vertical plates has a 30mm long and 5mm wide strip groove 11, which is used for position calibration.

[0050] Example 4:

[0051] See Figures 1 to 4Based on Embodiment 1 or Embodiment 3, in this embodiment, the suction body 5 is provided with vacuum holes 13 on its radial side along the tube electrode 2. Specifically, a total of four vacuum holes 13 are provided, respectively located on the front, rear, left, and right sides of the suction body 5. Among them, the vacuum holes 13 located at the front and rear are located near the top surface of the suction body 5, and the vacuum holes 13 located on the left and right sides are located near the bottom surface of the suction body 5. The purpose of this arrangement is that the left and right vacuum holes 13 are mainly used to suction the electrolyte (i.e., the electrolyte after electrolytic processing) in the inner cavity, while the front and rear vacuum holes 13 are used to extract the gas in the inner cavity, so as to maintain a low pressure or negative pressure state in the inner cavity of the suction body 5 and accelerate the suction rate of the electrolyte.

[0052] The circumferential inner wall of the vacuum hole 13 is threaded, and the vacuum hole 13 is sealed to the vacuum tube. The vacuum tube comprises three sections: a first vacuum tube 22 is connected at one end to the left and right vacuum holes 13, and at the other end to the transition cavity 8; a second vacuum tube 23 is connected at one end to the transition cavity 8, and at the other end to the vacuum tank 6; a third vacuum tube 24 is connected at one end to the front and rear vacuum holes 13, and at the other end directly to the vacuum tank 6. The transition cavity 8 is equipped with a first pressure monitoring device 14 for monitoring its internal pressure parameters. The first pressure monitoring device 14 is a pressure gauge with a range of 0-60 MPa and an accuracy class of 2.5.

[0053] The vacuum chamber 6 is made of 304 stainless steel, while the lid is made of acrylic sheet or other transparent and sturdy materials to facilitate observation of the interior. A silicone gasket seals the chamber and lid. Three small holes are provided on the lid of the vacuum chamber 6, connected to an inlet valve, an outlet valve (not shown in the figure), and a second pressure monitoring device 15, respectively. A pneumatic vacuum filter 16 is installed between the vacuum pump 7 and the vacuum chamber 6. The pneumatic vacuum filter 16 contains a replaceable filter element, and its inner ends are spring-loaded quick-change connectors for easy filter element replacement.

[0054] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A deep hole electrochemical machining device, comprising a base (1) for placing a workpiece (9), and a tube electrode (2) capable of moving along the surface of the workpiece (9) and the normal of the surface, the tube electrode (2) being connected with an electrolyte tank (3) containing electrolyte, the electrolyte flowing to the surface of the workpiece (9) through the tube electrode (2), further comprising a power supply (4), the negative electrode of the power supply (4) being electrically connected with the tube electrode (2), and the positive electrode of the power supply (4) being electrically connected with the workpiece (9), characterized in that, The outer periphery of the tube electrode (2) is sleeved with a suction body (5), and a sealing structure is arranged on the contact surface of the suction body (5) and the workpiece (9), the suction body (5) is used for sucking electrolyte in the deep hole; further comprising a vacuum pipe and a vacuum barrel (6), one end of the vacuum pipe is in sealing connection with the suction body (5), the other end is connected with the vacuum barrel (6), the vacuum barrel (6) is connected with a vacuum pump (7), and a transition cavity (8) is arranged on the vacuum pipe; the suction body (5) is provided with opposite first and second through holes (501, 502) on the two side surfaces in the length direction of the tube electrode (2), an inner container (503) is arranged in the inner cavity of the suction body (5), the inner container (503) is fixedly connected with the plane where the first through hole (501) is located on the suction body (5), the inner container (503) is suspended near one end of the second through hole (502) and is provided with a third through hole (504) concentric with the first through hole (501) or the second through hole (502) on the end surface, and the tube electrode (2) penetrates through the first through hole (501), the second through hole (502) and the third through hole (504).

2. The deep hole electrochemical machining device according to claim 1, wherein The plane where the first through hole (501) is located is further provided with a first recess (10), the first recess (10) is circular and concentric with the first through hole (501).

3. The apparatus according to claim 1, wherein The plane where the second through hole (502) is located is further provided with a second recess (12), the second recess (12) is annular and concentric with the second through hole (502), and the sealing structure is arranged in the second recess (12).

4. The apparatus for deep hole electrochemical machining according to claim 1, wherein The side surface of the suction body (5) in the radial direction of the tube electrode (2) is provided with a vacuum hole (13), and the vacuum pipe is connected with the inner cavity of the suction body (5) through the vacuum hole (13).

5. The deep hole electrochemical machining device according to claim 4, wherein There are at least two vacuum holes (13), at least one of which is arranged near one end of the top surface of the suction body (5), and at least one of which is arranged near one end of the bottom surface of the suction body (5).

6. The apparatus for deep hole electrochemical machining according to claim 1, wherein The opposite sides of the transition cavity (8) are respectively in sealing connection with the vacuum pipe, and the transition cavity (8) is further provided with a first pressure monitoring device (14) for monitoring the internal pressure parameter thereof.

7. The apparatus according to claim 1, wherein One side surface of the vacuum barrel (6) is provided with three small holes, respectively connected with an air inlet valve, an air outlet valve and a second pressure monitoring device (15).

8. A deep hole electrochemical machining method using the deep hole electrochemical machining apparatus according to any one of claims 1 to 7, characterized by, The steps include: Step S1, the workpiece (9) is fixed on the base (1), the liquid inlet end of the tube electrode (2) is connected with the electrolyte tank (3) containing electrolyte, the negative electrode of the power supply (4) is electrically connected with the tube electrode (2), the positive electrode of the power supply (4) is electrically connected with the workpiece (9), the suction body (5) is sleeved on the tube electrode (2), and the tube electrode (2) penetrates through the first through hole (501), the second through hole (502) and the third through hole (504); Step S2, moving the tube electrode (2) to the workpiece (9) direction and keeping the machining gap of 100-300 microns with the workpiece (9); Step S3, driving the electrolyte tank (3) to make the electrolyte flow into the liquid inlet end of the tube electrode (2) and spray out from the liquid outlet end, and make the electrolyte fill the suction body (5); Step S4, starting the power supply (4) to carry out electrolytic machining; Step S5, when the machining is completed, the power supply (4) is turned off and the driving electrolyte tank is stopped, after the negative pressure in the suction body (5) disappears, the deep hole electrolytic machining device is closed, and the suction body (5) and the workpiece (9) are taken out.

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