Method for enhancing conveying of electrolytic machining products through surface brush-imitating microelectrode

Abstract

The invention discloses a method for enhancing transportation of electrolytic machining products through a surface brush-imitating microelectrode, and relates to the technical field of micro electrolytic machining. The surface brush-imitating microelectrode (1) is characterized in that a microelectrode base body (2) is columnar, and a brush-imitating microstructure (3) is arranged on the surface of the microelectrode base body (2). The device used in the method comprises the surface brush-imitating microelectrode (1), a workpiece (5), an electrode clamp (8), a workpiece clamp (9), a working groove (10), a three-coordinate mobile platform (11), a pulse power supply (12) and an industrial personal computer (13). In the micro-electrochemical machining process, the workpiece (5) is kept static, the surface brush-imitating microelectrode (1) is fed through the three-coordinate moving platform (11), and meanwhile, the surface brush-imitating microelectrode (1) reciprocates up and down according to a certain amplitude in the Z-axis direction of the three-coordinate moving platform (11). By means of the method, the problem that electrolytic machining micro-gap electrolytic products are prone to adhesion is solved, the mass transfer efficiency of micro-electrochemical machining is improved, and finally the machining efficiency of micro-electrochemical machining is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of micro electrolytic machining, and in particular provides a method for enhancing the transport of electrolytic machining products by micro electrodes with imitation brush surfaces. Background Art

[0002] Precision and miniaturization are the mainstream development direction of modern industrial products. MEMS, which are characterized by small shapes and sizes, have been applied to aerospace, bioengineering, medical, automotive and other fields. Although most of the components in MEMS are manufactured using silicon-based micromachining technology, in some high-precision mechanical products, silicon-based microstructures / components are gradually being replaced by metal microstructures / components in order to improve specific performance and realize specific functions.

[0003] Micro-electrolytic machining technology is a type of micro-machining technology based on electrochemical redox reaction to manufacture metal microstructures / components. It has the advantages of no contact between the cathode tool and the anode, no cathode loss, no limitation of the mechanical properties of the electrolyzed material, and good machining surface quality. It is suitable for machining metal or semiconductor microstructures and components with small feature sizes. Micro-nano scale tool electrodes are an important part of the micro-electrolytic machining system and a necessary prerequisite for micro-nano electrolytic machining. Their performance directly affects the stability of the machining process and the quality of the machining results. The surface of the tool electrode commonly used in traditional methods is relatively smooth. Under static liquid conditions, the smooth surface of the tool electrode cannot fully absorb the electrolytic products, and the electrolytic products are easy to adhere to the cathode surface, resulting in short-circuit discharge in the machining micro-gap, as well as collision and bending of the tool electrode and the workpiece, which affects the original conductivity and mass transfer performance of the metal wire, resulting in unstable electrolytic cutting and poor machining quality. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a method for enhancing mass transfer in electrolytic machining with a surface-mimicking brush microelectrode, so as to solve the problem of easy adhesion of electrolytic products in micro-gap electrolytic machining, enhance the mass transfer efficiency of micro-electrolytic machining, and ultimately improve the machining efficiency of micro-electrolytic machining.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a surface brush-like microelectrode (1), characterized in that the microelectrode substrate (2) is columnar in shape and has a brush-like microstructure (3) on its surface.

[0006] Preferably, the cross-sectional shape of the microelectrode substrate (2) is circular, the diameter is 1 to 300 μm, and the material is carbon nanotube fiber.

[0007] Preferably, the brush-like microstructure (3) is constructed vertically and evenly on the surface of the microelectrode substrate (2).

[0008] Preferably, the height of the brush-like microstructure (3) is 1 to 500 nm, and the material molecular formula is NiCo 2 S 4 .

[0009] Preferably, a nanostructure (4) is constructed on the surface of the brush-like microstructure (3).

[0010] For the same purpose, the second aspect of the present invention also provides a method for enhancing the transport of electrolytic processing products by using a surface brush-like microelectrode, comprising the following steps: the device of the method comprises the surface brush-like microelectrode (1), a workpiece (5), an electrode fixture (8), a workpiece fixture (9), a working tank (10), a three-coordinate moving platform (11), a pulse power supply (12), and an industrial computer (13). The surface brush-like microelectrode (1) is fixed on the electrode fixture (8), and the workpiece (5) is fixed on the workpiece fixture (9), serving as a cathode and an anode in an electrochemical reaction, respectively.

[0011] Preferably, during the micro-electrolytic machining process, the workpiece (5) remains stationary, and the surface brush-like microelectrode (1) is fed through the three-coordinate moving platform (11). At the same time, the surface brush-like microelectrode (1) reciprocates up and down at a certain amplitude in the Z-axis direction of the three-coordinate moving platform (11).

[0012] Preferably, during the micro-electrolytic machining process, the distance between the surface brush-like microelectrode (1) and the workpiece (5) remains unchanged and is maintained at 1 to 1000 μm.

[0013] The beneficial effects of the present invention are:

[0014] The method for enhancing the transport of electrolytic processing products by the surface-imitation brush microelectrode provided in the present invention effectively utilizes the imitation brush microstructure constructed on the surface of the tool electrode. The bristles of these microstructures imitation brushes can effectively enhance the flow resistance of the solid-liquid interface, inhibit boundary slip, and have sufficient gripping force on the electrolytic products. During the micro-electrolytic processing, the tool electrode is fed and reciprocated up and down, similar to "cleaning a test tube with a brush", such as Figure 2 As shown, the pulse current simultaneously charges the surface of the microstructure, thereby inhibiting the adhesion of electrolytic products with the same charge. The electrolytic products can only be "brushed" out by the tool electrode, which ultimately plays an important role in improving the mass transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the surface brush-like microelectrode and its surface features;

[0016] Figure 2 This is a schematic diagram of the effect of the surface brush-like microelectrode analogous to the brush;

[0017] Figure 3 It is a schematic diagram of the structure of the device for realizing the method of enhancing the transport of electrolytic processing products by using surface imitation brush microelectrodes of the present invention;

[0018] Figure 4 for Figure 3 A schematic diagram of the structure at a is enlarged;

[0019] Figure 5 For comparison, the surface imitation brush microelectrode and smooth tungsten rod were used. Figure 4 A schematic diagram of the structure at point b is enlarged;

[0020] Figure 6 The velocity cloud diagram of the flow field simulation in the micro gap for smooth tungsten rod processing;

[0021] Figure 7 The velocity cloud diagram of the flow field simulation in the micro-gap of the surface imitation brush micro-electrode processing;

[0022] Figure 8 Schematic diagram of the effects of the two electrodes obtained from the simulation results.

[0023] In the figure: 1 surface brush-like microelectrode, 2 microelectrode matrix, 3 brush-like microstructure, 4 nanostructure, 5 workpiece, 6 bubble, 7 electrolysis product, 8 electrode fixture, 9 workpiece fixture, 10 working tank, 11 three-coordinate moving platform, 12 pulse power supply, 13 industrial computer, 14 XY plane movement direction of surface brush-like microelectrode, 15 Z axis movement direction of surface brush-like microelectrode, 16 total movement trajectory of surface brush-like microelectrode, 17 smooth tungsten rod. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Embodiment 1:

[0026] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , a method for enhancing the transport of electrolytic processing products by using a surface imitation brush microelectrode, comprising the following steps:

[0027] Step 1: Preparation of the above-mentioned surface brush-like microelectrode 1:

[0028] Hydrothermal growth method: Ni on the surface of carbon nanotube fibers 2+ and Co 3+ NiCo is obtained by hydrothermal formation of Ni / Co precursor and then sulfidation of the precursor. 2 S 4In addition, the preparation methods of the above-mentioned surface imitation brush microelectrode 1 also include adhesive assembly method, electrostatic method, etc. This embodiment adopts hydrothermal growth method.

[0029] Step 2: According to the material and shape to be processed, the processing path and processing parameters are designed on the industrial computer 13. The working tank 10 is used to contain the electrolyte for immersing the surface brush-like microelectrode 1 and the workpiece 5. The surface brush-like microelectrode 1 is driven by a three-coordinate mobile platform 11, and its movable end can move in the X, Y, and Z axes. The X axis and the Y axis are perpendicular to each other and parallel to the horizontal plane, and the Z axis is perpendicular to the horizontal plane.

[0030] Step 3: In order to fix the surface brush-like microelectrode 1 and the workpiece 5, the processing device in this embodiment further includes an electrode fixture 8 and a workpiece fixture 9. The electrode fixture 8 is fixed to the movable end of the three-coordinate moving platform 11, and the surface brush-like microelectrode 1 is fixed to the electrode fixture 8. The surface brush-like microelectrode 1 is arranged vertically.

[0031] Step 4: Fix the workpiece 5 on the work platform by the workpiece fixture 9. To ensure its stability and precise positioning, the workpiece 5 always remains stationary. The processing gap is maintained at 1 to 1000 μm depending on the situation. The negative pole of the pulse power supply 12 is used to connect the above-mentioned surface brush-like microelectrode 1, and the positive pole is used to connect the workpiece 5.

[0032] Step 5: Select a suitable electrolyte according to the material type and processing requirements, and pour a proper amount of electrolyte into the working tank 10 to immerse the surface brush-like microelectrode 1 and the workpiece 5.

[0033] Step 6: Turn on the nanosecond pulse power supply 12 and start the three-coordinate moving platform 11. According to the setting of the industrial computer 13, the surface brush-like microelectrode 1 is fed in the XY plane according to the given parameters (such as Figure 4 The Z axis of the three-coordinate mobile platform 11 drives the surface brush-like microelectrode 1 to move up and down according to given parameters (such as Figure 4 Label 15), the final motion trajectory is as follows Figure 4 The arrow of reference numeral 16 indicates that the brush-like microstructure 3 combined with the brush-like microelectrode 1 on the surface is helpful to reduce the adhesion of the electrolysis product 7 and accelerate the renewal of the electrolyte.

[0034] Step 7: During the processing, in order to maintain the stability of the movement of the surface brush-like microelectrode 1, it is necessary to continuously monitor the processing effect and processing parameters, and adjust them as needed to ensure the processing quality and accuracy.

[0035] Step 8: When the processing reaches the predetermined position or shape, stop the machine, check the processing results, and carry out subsequent cleaning and processing.

[0036] Embodiment 2:

[0037] To illustrate the usefulness of the present invention, a smooth tungsten rod 17 of the same specification is used to replace the above-mentioned surface imitation brush microelectrode 1, and the remaining implementation steps are the same as step 2 to step 8 of embodiment 1.

[0038] Through experiments, it was found that, compared with the smooth tungsten rod 17, the electrolytic products 7 and bubbles 6 in the electrolytically processed micro-gap were significantly reduced by using the above-mentioned micro-electrode 1 with imitation brush surface, which significantly improved the mass transfer efficiency in the processed micro-gap.

[0039] Embodiment three:

[0040] To illustrate the usefulness of the present invention, the following is established: Figure 4 The simulation model in the fluid domain is shown, and the motion trajectory of the tool electrode is set. The shapes of the tool electrode refer to the smooth tungsten rod 17 and the above-mentioned surface imitation brush microelectrode 1, Figure 4 The cross section b is as follows Figure 5 As shown, Figure 5 is the main fluid area of ​​the simulation. The fluid velocity cloud diagram in the machining micro gap obtained by simulation is shown in Figure 6 and Figure 7 The simulation results are shown in Figure 8 As shown. Figure 6 and Figure 7 The analysis leads to the conclusion that when the above-mentioned surface imitation brush microelectrode 1 is used, the dynamic characteristics of the electrolyte in the processed microgap are more significant, which is more conducive to accelerating the mass transfer rate.

[0041] The implementation results show that the method of surface micro-texturing to enhance the transport of electrolytic products provided by the present invention can solve the problem of easy adhesion of electrolytic products in micro-gap electrolytic machining, enhance the mass transfer efficiency of micro-electrolytic machining, and ultimately improve the machining efficiency of micro-electrolytic machining.

[0042] Matters not covered by the present invention are known technologies.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A surface brush-like microelectrode (1), characterized in that: The microelectrode substrate (2) is columnar in shape, and the surface of the microelectrode substrate (2) has a brush-like microstructure (3).

2. The surface brush-like microelectrode according to claim 1, characterized in that: The microelectrode substrate (2) has a circular cross-section, a diameter of 1 to 300 μm, and is made of carbon nanotube fibers.

3. The surface brush-like microelectrode according to claim 1, characterized in that: The brush-like microstructure (3) is vertically and evenly constructed on the surface of the microelectrode substrate (2).

4. The surface-mimicking brush microelectrode according to claim 1, characterized in that: The height of the brush-like microstructure (3) is 1 to 500 nm, and the material molecular formula is NiCo2S4.

5. The surface-mimicking brush microelectrode according to claim 1, characterized in that: A nanostructure (4) is constructed on the surface of the brush-like microstructure (3).

6. The method for enhancing the transport of electrolytic processing products by using a surface-mimicking brush microelectrode as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: The device of the method comprises the surface brush-like microelectrode (1), a workpiece (5), an electrode fixture (8), a workpiece fixture (9), a working tank (10), a three-coordinate moving platform (11), a pulse power supply (12), and an industrial computer (13). The surface brush-like microelectrode (1) is fixed on the electrode fixture (8), and the workpiece (5) is fixed on the workpiece fixture (9), serving as a cathode and an anode in an electrochemical reaction, respectively.

7. The method for enhancing the transport of electrolytic processing products by using a surface-mimicking brush microelectrode according to claim 6, characterized in that: During the micro-electrolytic machining process, the workpiece (5) remains stationary, and the surface brush-like microelectrode (1) is fed through a three-coordinate moving platform (11). At the same time, the surface brush-like microelectrode (1) reciprocates up and down at a certain amplitude in the Z-axis direction of the three-coordinate moving platform (11).

8. The method of enhancing the transport of electrolytic processing products by using a surface-mimicking brush microelectrode according to claim 6, characterized in that: During the micro-electrolytic machining process, the distance between the surface brush-like micro-electrode (1) and the workpiece (5) remains unchanged and is maintained at 1 to 1000 μm.

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