CN107931756B - Method for preparing cathode of tool for cutting carbon nano tube fiber by micro electrolysis line - Google Patents
Method for preparing cathode of tool for cutting carbon nano tube fiber by micro electrolysis line Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 153
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 151
- 239000000835 fiber Substances 0.000 title claims abstract description 151
- 238000005520 cutting process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 19
- 238000009713 electroplating Methods 0.000 claims abstract description 67
- 238000012545 processing Methods 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 42
- 238000007747 plating Methods 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 23
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 238000003754 machining Methods 0.000 abstract description 22
- 238000002360 preparation method Methods 0.000 abstract description 9
- 238000012546 transfer Methods 0.000 abstract description 5
- 238000005459 micromachining Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 23
- 239000003792 electrolyte Substances 0.000 description 8
- 238000000635 electron micrograph Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 229910021404 metallic carbon Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- B23H3/04—Electrodes specially adapted therefor or their manufacture
- B23H3/06—Electrode material
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
the invention relates to a preparation method of a tool cathode for cutting carbon nano tube fibers by using a micro electrolysis line, belonging to the field of micro electrochemical machining. The method is characterized in that: firstly, mounting carbon nanotube fibers on a wire electrode clamp through a conductive fastening screw; then, plating a layer of metal on the local surface or the whole surface of the original carbon nanotube fiber by a micro electroplating method to improve the whole conductivity of the original carbon nanotube fiber so as to meet the requirement of micro electrolytic wire cutting processing; and finally, the excellent surface hydrophilic property of the carbon nanotube fiber and the reciprocating vibration of the carbon nanotube fiber in the direction perpendicular to the feeding direction are utilized to accelerate the mass transfer rate in the micro-machining gap and improve the stability and efficiency of the micro-electrolysis linear cutting machining.
Description
Technical Field
The invention relates to a preparation method of a tool cathode for cutting carbon nano tube fibers by using a micro electrolysis line, belonging to the field of micro electrochemical machining.
background
The micro electrolytic wire cutting technology is a material reducing manufacturing method based on the electrochemical anode dissolution principle. The method takes a metal wire with the diameter of several micrometers to tens of micrometers as a tool line electrode, can realize the preparation of a plane profile structure with any shape by combining multi-axis numerical control motion, and is particularly suitable for processing micro-slits, micro-grooves and metal microstructures with large depth-to-width ratios. Compared with other fine machining methods, the fine electrolytic wire cutting technology has the characteristics of wide machining range (not limited by material strength and hardness), high efficiency, no recast layer and microcrack on the surface, no loss of a tool electrode and the like.
The wire electrode is a necessary condition for carrying out micro-electrolysis wire cutting machining, the characteristic size of the wire electrode directly influences the quality of a formed part, and the performance of the wire electrode directly influences the stability and the efficiency of the wire cutting machining process. When a wire electrode is used for electrolytic machining of a high-aspect-ratio fine structure, the side gap is usually reduced to several microns or even to a submicron scale, and a machined product is easy to accumulate in a machining area, so that the local electrolyte components and concentration in the machining area are changed to a great extent, the reaction speed is reduced, even short circuit is caused, and the machining cannot be continuously carried out. According to literature reports, researchers respectively provide enhanced mass transfer methods such as one-way wire moving of a ring-shaped wire electrode, axial reciprocating micro-amplitude vibration of the wire electrode, reciprocating wire conveying of the wire electrode and the like so as to improve the machining quality, efficiency and stability of micro-electrolysis wire cutting. The common characteristic of the above-mentioned methods is that the movement of the wire electrode in the axial direction is used to promote the electrolyte in the machining gap to flow, thereby increasing the mass transfer speed in the gap. However, the wire electrode commonly used at present is made of metal, such as tungsten wire, molybdenum wire, platinum wire, etc. The surfaces of the electrode wires are relatively smooth, and the 'dragging force' generated by the movement of the electrode wires hardly causes the rapid flow of electrolyte in the gaps, which is one of the main factors that the processing efficiency cannot be further improved. In the conventional micro-fluid research, the problem of reducing the flow resistance is often focused, but the problem faced in the micro-wire cutting process is the opposite, and the movement of the cutting tool needs to "drive" as much electrolyte as possible, so that the flow resistance between the fluid and the wall surface of the solid tool needs to be increased. Research shows that the surface of the micro-nano flow channel has hydrophilicity, so that the flow resistance between liquid and solid can be effectively enhanced, the boundary slippage between the solid and the liquid is inhibited, and the dragging force between the solid and the liquid is increased. Therefore, the micro tool with the super-hydrophilic surface is introduced into micro electrolytic wire cutting processing, more electrolyte is driven to move by pulling the tool, the problem that products in a processing gap are discharged quickly is hopefully solved, and the processing precision and efficiency of the micro electrolytic wire cutting processing are improved.
Since 1991, Carbon Nanotubes (CNTs) were discovered by the Japanese Electron microscopy expert Iijima, they have attracted extensive interest from experts in different research areas worldwide due to their unique structures and superior properties. The university of Qinghua Van-Daizian team in 2002 pulls out fiber materials with continuous lengths from the carbon nanotube array, and greatly promotes the development of novel fibers, namely carbon nanotube fibers. Research shows that compared with natural fibers and traditional chemical fibers, the carbon nanotube fibers have obvious difference in structure, and the unique assembly structure characteristics of the carbon nanotube fibers endow the fibers with rich interface structures and excellent surface properties. Compared with the similar carbon-based composite material, the carbon nanotube fiber has higher thermal conductivity and mechanical strength than the graphene fiber which is currently developed, and also has light weight and weavability which are not possessed by the carbon fiber, thereby being convenient for processing and treatment. Although carbon nanotubes have excellent application prospects in the fields of structural materials and functional materials, the carbon nanotubes are easy to generate internal defects in the preparation process, and organic solvent molecules or resin interlayers are easy to mix in the fiber preparation process, so that the conductivity of the carbon nanotube fiber is about 2 orders of magnitude lower than that of the conventional copper at present. Therefore, how to further improve the conductivity of the carbon nanotube fiber and widen the application field range of the carbon nanotube fiber becomes an urgent problem to be solved.
disclosure of Invention
The invention aims to provide a preparation method of a carbon nano tube fiber tool cathode suitable for micro-electrolysis wire cutting, aiming at the problems of product discharge in a micro-machining gap of micro-electrolysis wire cutting, difficulty in electrolyte renewal and poor machining stability.
A method for preparing a cathode of a tool for cutting carbon nano tube fibers by a micro electrolysis line is characterized by comprising the following steps: the tool cathode comprises a cathode line electrode clamp and carbon nanotube fibers, wherein two ends of the carbon nanotube fibers are fixed on the cathode line electrode clamp through conductive fastening screws; the carbon nano tube fiber is a processing section at the notch structure of the cathode wire electrode clamp, and the rest part is a non-processing section; the carbon nano tube fiber has a spiral surface appearance and a diameter of 10 mu m; the non-processing section of the carbon nano tube fiber is electroplated with a metal coating with the thickness of 15 mu m, and the material of the metal coating is silver, nickel or copper; the method comprises the following processes: step 1, installing carbon nanotube fibers on a line electrode clamp through a conductive fastening screw; wherein, an insulating sleeve is arranged on the carbon nano tube fiber at the notch structure of the cathode line electrode clamp; and 2, immersing the cathode of the tool into an electroplating bath filled with electroplating solution, and carrying out micro-electroplating on the non-processed section of the carbon nano tube fiber to form a uniform metal coating on the surface of the non-processed section of the carbon nano tube fiber, wherein the current density of electroplating is 20A/dm2, and the time is 20 min.
a method for preparing a cathode of a tool for cutting carbon nano tube fibers by a micro electrolysis line is characterized by comprising the following steps: the tool cathode comprises a cathode line electrode clamp and carbon nanotube fibers, wherein two ends of the carbon nanotube fibers are fixed on the cathode line electrode clamp through conductive fastening screws; the carbon nano tube fiber is a processing section at the notch structure of the cathode wire electrode clamp, and the rest part is a non-processing section; the carbon nano tube fiber has a spiral surface appearance and a diameter of 10 mu m; the non-processing section of the carbon nano tube fiber is electroplated with a metal coating with the thickness of 10 mu m, and the material of the metal coating is silver, nickel or copper; the method comprises the following processes: step 1, installing carbon nanotube fibers on a line electrode clamp through a conductive fastening screw; wherein, an insulating sleeve is arranged on the carbon nano tube fiber at the notch structure of the cathode line electrode clamp; and 2, immersing the cathode of the tool into an electroplating bath filled with electroplating solution, and carrying out micro-electroplating on the non-processed section of the carbon nano tube fiber to form a uniform metal coating on the surface of the non-processed section of the carbon nano tube fiber, wherein the current density of electroplating is 10A/dm2, and the time is 10 min.
A method for preparing a cathode of a tool for cutting carbon nano tube fibers by a micro electrolysis line is characterized by comprising the following steps:
The tool cathode comprises a cathode line electrode clamp and carbon nanotube fibers, wherein two ends of the carbon nanotube fibers are fixed on the cathode line electrode clamp through conductive fastening screws; the carbon nano tube fiber has a spiral surface appearance and a diameter of 10 mu m; the carbon nano tube fiber is electroplated with a 4 mu m metal coating which is made of silver, nickel or copper; the preparation method comprises the following steps: step 1, installing carbon nanotube fibers on a line electrode clamp through a conductive fastening screw; and 2, immersing the cathode of the tool into an electroplating bath filled with electroplating solution, and carrying out micro-electroplating on the carbon nanotube fibers to form a uniform metal coating on the whole surface of the carbon nanotube fibers, wherein the electroplating current density is 8A/dm2, and the time is 5 min.
A method for preparing a cathode of a tool for cutting carbon nano tube fibers by a micro electrolysis line is characterized by comprising the following steps: the tool cathode comprises a cathode line electrode clamp and carbon nanotube fibers, wherein two ends of the carbon nanotube fibers are fixed on the cathode line electrode clamp through conductive fastening screws; the carbon nano tube fiber has a spiral surface appearance and a diameter of 10 mu m; the carbon nano tube fiber is electroplated with a 1 mu m metal coating which is made of silver, nickel or copper; the preparation method comprises the following steps: step 1, installing carbon nanotube fibers on a line electrode clamp through a conductive fastening screw; and 2, immersing the cathode of the tool into an electroplating bath filled with electroplating solution, and carrying out micro-electroplating on the carbon nanotube fibers to form a uniform metal coating on the whole surface of the carbon nanotube fibers, wherein the electroplating current density is 3A/dm2, and the time is 1 min.
the invention has the beneficial effects that:
1. The invention provides a carbon nanotube fiber tool cathode suitable for micro-electrolysis wire cutting and a preparation method thereof, firstly, on the basis of original carbon nanotube fibers, the electrical conductivity is optimized by a micro-electroplating method so as to meet the requirements of micro-electrolysis wire cutting processing; then, the excellent surface hydrophilic property of the carbon nano tube fiber and the reciprocating vibration of the carbon nano tube fiber in the direction vertical to the feeding direction are utilized, the mass transfer rate in a tiny processing gap is accelerated, and the stability and the efficiency of linear cutting processing are improved.
2. Generally, ohmic contact is formed between metallic carbon nanotubes and a metal electrode, and schottky contact is formed between semiconducting carbon nanotubes and a metal electrode. The schottky contact forms schottky barriers with different heights due to the difference of work functions of metal electrode materials, so that a larger contact resistance is generated between the carbon nanotube and the metal electrode. Therefore, the carbon nanotube fiber in this patent may form a large contact resistance with the conductive fastening screw. In addition, microscopic defects and organic resin interlayers are generally present inside the carbon nanotube fibers, reducing the electrical conductivity.
The metal coating provided by the invention plays a role of a bridge on the surface of the carbon nanotube fiber, can effectively improve the overall conductivity of the carbon nanotube fiber, is suitable for the carbon nanotube fiber with the diameter of 5-30 mu m, and has the advantages of good continuity of a micro electroplating process, simplicity and convenience in control, high efficiency, low cost and strong practicability.
When local electroplating is carried out, the processing section of the carbon nanotube fiber keeps the original appearance, the metal coating on the surface of the non-processing section is thicker, the thickness is generally 10-20 mu m, the contact resistance between the carbon nanotube fiber and the conductive fastening screw can be effectively reduced, a bridge is formed on the surface of the non-processing section of the carbon nanotube fiber, and the conductive performance of the carbon nanotube fiber can be effectively improved;
when the whole electroplating is carried out, the thin metal coating covers the surface of the carbon nano tube fiber to form a whole bridge, the thickness is generally 1-4 mu m, the reduction of the whole conductivity of the carbon nano tube fiber caused by internal defects and organic resin interlayers can be effectively compensated, but the metal coating does not influence the whole surface appearance and the hydrophilic performance of the carbon nano tube fiber.
Drawings
FIG. 1 is a schematic view of a carbon nanotube fiber tool cathode surface being electroplated.
Fig. 2 is a schematic diagram of a carbon nanotube fiber tool cathode surface after partial plating.
Fig. 3 is a schematic diagram of a carbon nanotube fiber tool cathode surface after bulk plating.
Fig. 4 is a schematic diagram of a carbon nanotube fiber tool cathode for use in micro-electro-mechanical wire cutting processes.
FIG. 5 is an electron micrograph of the surface of the cathode non-processing section of the carbon nanotube fiber tool after being partially electroplated, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 20A/dm2, the time is 20min, and the electroplating layer thickness is 15 μm.
FIG. 6 is an electron micrograph of the surface of the cathode non-processing section of the carbon nanotube fiber tool after being partially electroplated, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 10A/dm2, the time is 10min, and the electroplating layer thickness is 10 μm.
FIG. 7 is an electron micrograph of the surface of the cathode non-processing section of the carbon nanotube fiber tool after being partially electroplated, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 25A/dm2, the time is 30min, and the thickness of the electroplating layer is 25 μm.
FIG. 8 is an electron micrograph of the surface of the cathode non-processed section of the carbon nanotube fiber tool after being partially electroplated, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the current density of electroplating is 9A/dm2, the time is 9min, and the thickness of the electroplating layer is 7 μm.
FIG. 9 is an electron micrograph of the cathode of the carbon nanotube fiber tool after electroplating, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the current density of electroplating is 8A/dm2, the time is 5min, and the thickness of the electroplating layer is 4 μm.
FIG. 10 is an electron microscope photograph of the cathode of the carbon nanotube fiber tool after electroplating, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the current density of electroplating is 3A/dm2, the time is 1min, and the thickness of the electroplating layer is 1 μm.
FIG. 11 is an electron micrograph of the cathode of the carbon nanotube fiber tool after electroplating, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the current density of electroplating is 9A/dm2, the time is 7min, and the thickness of the electroplating layer is 6 μm.
The label names are: 1. a conductive fastening screw; 2. a wire electrode clamp; 3. carbon nanotube fibers; 4. an insulating sleeve; 5. a notch structure; 6. electroplating solution; 7. an electroplating bath; 8. a direct current power supply anode; 9. a metal plate; 10. a negative electrode of a direct current power supply; 11. a metal plating layer; 12. the processing area is free of coating carbon nanotube fibers; 13. carbon nanotube fiber with thin coating on the surface; 14. a workpiece; 15. a workpiece holder; 16. an electrolyte; 17. an electrolytic cell; 18. an air floating platform; 19. a CCD microscope; 20. an oscilloscope; 21. a pulse power supply; 22. an industrial personal computer; 23. a motion control card; 24. a Z motion control axis; 25. a Y motion control axis; 26. an X motion control axis; 27. a machine tool body.
Detailed Description
the three-dimensional motion control axis X-axis 26, the Y-axis 25 and the Z-axis 24 are arranged on a machine tool body 27, and the machine tool body 27 is fixed on the air floatation platform 18. The three-dimensional motion control axis is controlled by the industrial personal computer 22 through the motion control card 23.
(1) The carbon nanotube fiber 3 is mounted on a wire electrode holder 2 and immersed in a plating bath 7 containing a plating solution 6. The carbon nanotube fiber 3 is prepared from an array carbon nanotube by a spinning method, the surface appearance is spiral, and the diameter is 5-100 mu m; the metal plate 9 may be silver, nickel or copper, and the plating solution 6 is a mixed solution containing ions of the same metal element as the metal plate 9.
(2) Connecting a metal plate 9 with a direct current power supply anode 8, connecting the carbon nanotube fiber 3 with a direct current power supply cathode 10, and performing micro electroplating on the surface of the carbon nanotube fiber 3 to form a uniform metal coating 11 on the surface so as to improve the conductivity of the carbon nanotube fiber. When the carbon nanotube fiber 3 is locally electroplated, an insulating sleeve 4 can be arranged on the carbon nanotube fiber at the notch structure 5 of the wire electrode clamp, so that the carbon nanotube fiber at the processing section still keeps the original shape after the electroplating is finished; the current density of the electroplating can be 10-20A/dm 2, the time can be 10-20 min, and the thickness of the metal coating 11 on the surface of the carbon nano tube fiber at the non-processing stage is 10-20 μm. When the carbon nanotube fiber 13 with a thin coating on the surface is prepared by carrying out integral electroplating on the carbon nanotube fiber 3, the thin metal coating 11 covers the whole surface of the carbon nanotube fiber after the electroplating is finished, the electroplating current density can be 3-8A/dm 2, the time is 1-5 min, and the thickness of the metal coating 11 is 1-4 mu m; the metal plating layer 11 does not affect the overall surface morphology and the hydrophilic properties of the original carbon nanotube fiber 3.
(3) The prepared carbon nanotube fiber 3 is mounted as a tool wire electrode on a Z motion control shaft 24 of a micro electrolytic wire cutting machine by a wire electrode holder 2, the workpiece 14 is mounted on a holder 15, and the electrolytic solution 16 is poured into an electrolytic bath 17. The electrolyte can select acid, neutral and alkaline solutions with proper concentration according to different workpiece materials.
(4) The carbon nanotube fiber wire electrode 3 is connected with the negative electrode of a pulse power supply 21 through a conductive fastening screw 1, and the workpiece 14 is connected with the positive electrode of the pulse power supply 21, so that the micro-electrolytic wire cutting processing is carried out. The wire electrode clamp 2 and the carbon nanotube fiber wire electrode 3 are driven to vibrate up and down in a reciprocating manner through the motion control shaft Z shaft 24, so that the mass transfer efficiency in a machining gap is improved, wherein the vibration amplitude is 50-300 mu m, and the frequency is 0.5-10 Hz. The processing voltage range of the pulse power supply 21 can be 3-20V, the pulse width is 20-200 ns, the period is 0.5-10 mu s, and the processing speed range can be 0.1-5 mu m/s. In the machining process, the voltage pulse signal output by the pulse power supply 21 can be detected in real time through the oscilloscope 20, and a machining current signal is fed back at the same time. The CCD microscope 19 can observe and record the relative positional relationship between the wire electrode and the workpiece in real time, and the state of bubbles and other products generated in the machining area.
The wire electrode in the micro-electrolysis wire cutting processing is clamped on a wire electrode clamp under certain tension, generally, the conductivity of the wire electrode in the micro-electrolysis wire cutting processing needs to be more than 1x105S/cm, and the conductivity of the original carbon nano tube fiber is generally 1x 103S/cm-8 x 103S/cm. The electroplating method provided by the invention is suitable for carbon nanotube fiber line electrodes with the diameter of 5-30 mu m by optimizing the parameter interval.
FIG. 5 is an electron microscope photograph of the surface of the cathode non-processing section of the carbon nanotube fiber tool after local electroplating, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 20A/dm2, the time is 20min, the thickness of the electroplated layer is 15 μm, the conductivity is 9x106S/cm, the surface is flat and smooth, no crack exists, the quality is good, and the requirements of electrolytic machining of a line electrode are met.
FIG. 6 is an electron microscope photograph of the surface of the cathode non-processing section of the carbon nanotube fiber tool after local electroplating, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 10A/dm2, the time is 10min, the thickness of the electroplated layer is 10 μm, the conductivity is 4x106S/cm, the surface is smooth, no crack exists, the quality is good, and the requirements of electrolytic machining of a line electrode are met.
fig. 7 is an electron microscope photograph of the surface of the cathode non-processing section of the carbon nanotube fiber tool after local electroplating, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 25A/dm2, the time is 30min, the thickness of the electroplating layer is 25 μm, and the conductivity is 8x 106S/cm.
FIG. 8 is an electron micrograph of the surface of the cathode non-processing section of the carbon nanotube fiber tool after local electroplating, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 9A/dm2, the time is 9min, the thickness of the electroplated layer is 7 μm, the conductivity is only 9x104S/cm, the electroplated layer is not compact, cracks and defects are easily formed on the surface, and the requirements cannot be met.
FIG. 9 is an electron microscope photograph of the cathode of the carbon nanotube fiber tool after being electroplated, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 8A/dm2, the time is 5min, the thickness of the electroplated layer is 4 μm, the conductivity is 5x105S/cm, and the metal plating layer does not affect the overall surface morphology of the carbon nanotube fiber and meets the requirements of the electrochemical machining wire electrode.
FIG. 10 is an electron microscope photograph of the cathode of the carbon nanotube fiber tool after being electroplated, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 3A/dm2, the electroplating time is 1min, the thickness of the electroplating layer is 1 μm, the conductivity is 2x105S/cm, and the metal plating layer does not affect the overall surface morphology of the carbon nanotube fiber, thereby meeting the requirements of the electrochemical machining wire electrode. The example is the minimum parameter for carrying out overall electroplating on the carbon nanotube fiber, if the parameter is further reduced, namely the current density is less than 3A/dm2, the time is less than 1min, the plating layer is usually less than 1 μm, so that the electroplated layer is too thin and is difficult to observe, the conductivity of the original carbon nanotube fiber cannot be obviously improved, the implementation significance is not large, and the electroplating result with the further reduced parameter cannot meet the requirement.
FIG. 11 is an electron microscope photograph of the cathode of the carbon nanotube fiber tool after being electroplated, wherein the diameter of the spiral carbon nanotube fiber is 10 μm, the electroplating current density is 9A/dm2, the time is 7min, the thickness of the electroplated layer is 6 μm, the conductivity is only 7x104S/cm, and the metal plating layer changes the overall appearance of the carbon nanotube fiber and cannot meet the requirements.
Claims (2)
1. A method for preparing a cathode of a tool for cutting carbon nano tube fibers by a micro electrolysis line is characterized by comprising the following steps:
The tool cathode comprises a cathode wire electrode clamp (2) and carbon nanotube fibers (3) of which two ends are fixed on the cathode wire electrode clamp (2) through conductive fastening screws (1); the carbon nano tube fiber (3) is a processing section at the notch structure (5) of the cathode wire electrode clamp (2), and the rest part is a non-processing section; the surface appearance of the carbon nano tube fiber (3) is spiral, and the diameter is 10 mu m;
The non-processing section of the carbon nano tube fiber (3) is electroplated with a metal plating layer (11) with the thickness of 15 mu m, and the material of the metal plating layer (11) is silver, nickel or copper;
The method comprises the following processes:
step 1, installing carbon nanotube fibers (3) on a line electrode clamp (2) through conductive fastening screws (1); wherein an insulating sleeve (4) is arranged on the carbon nano tube fiber at the notch structure (5) of the cathode line electrode clamp (2);
And 2, immersing the cathode of the tool into a plating tank (7) filled with a plating solution (6), and performing micro-electroplating on the non-processing section of the carbon nano tube fiber (3) to form a uniform metal coating (11) on the surface of the carbon nano tube fiber, wherein the current density of electroplating is 20A/dm2, and the time is 20 min.
2. A method for preparing a cathode of a tool for cutting carbon nano tube fibers by a micro electrolysis line is characterized by comprising the following steps:
The tool cathode comprises a cathode wire electrode clamp (2) and carbon nanotube fibers (3) of which two ends are fixed on the cathode wire electrode clamp (2) through conductive fastening screws (1); the carbon nano tube fiber (3) is a processing section at the notch structure (5) of the cathode wire electrode clamp (2), and the rest part is a non-processing section; the surface appearance of the carbon nano tube fiber (3) is spiral, and the diameter is 10 mu m; the non-processing section of the carbon nano tube fiber (3) is electroplated with a metal plating layer (11) with the thickness of 10 mu m, and the material of the metal plating layer (11) is silver, nickel or copper;
The method comprises the following processes:
Step 1, installing carbon nanotube fibers (3) on a line electrode clamp (2) through conductive fastening screws (1); wherein an insulating sleeve (4) is arranged on the carbon nano tube fiber at the notch structure (5) of the cathode line electrode clamp (2);
and 2, immersing the cathode of the tool into a plating tank (7) filled with a plating solution (6), and performing micro-electroplating on the non-processing section of the carbon nano tube fiber (3) to form a uniform metal coating (11) on the surface of the carbon nano tube fiber, wherein the current density of electroplating is 10A/dm2, and the time is 10 min.
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| CN109455695A (en) * | 2018-12-19 | 2019-03-12 | 深圳烯湾科技有限公司 | Modified carbon nano-tube fiber and elastic composite and preparation method thereof |
| CN115041763B (en) * | 2022-05-09 | 2023-12-29 | 南京航空航天大学 | Preparation method of flexible carbon fiber composite electrode and application of flexible carbon fiber composite electrode in electrolytic machining |
| CN115041762A (en) * | 2022-05-09 | 2022-09-13 | 南京航空航天大学 | Preparation method and application of glass fiber flexible electrode |
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