Preparation method and device of hair follicle-like composite microstructure

Abstract

The invention discloses a preparation method and device of a hair follicle-like composite microstructure. According to the method, by means of the thermal deformation performance of the memory alloy material, the electrode deformation section made of the memory alloy material goes deep into the pit formed in the surface of the cutter through laser machining, the deformation section is heated to be in a circular arc shape, and an electrochemical etching method is adopted; an electrochemical system formed by an electrode, a cutter, a power supply device and electrolyte in the pit is used for enabling the rotating electrode to etch the pit into hair follicle structures, then flocking glue doped with magnetic particles is injected into the hair follicle structures, fiber bundles are implanted into the hair follicle structures, and then the hair follicle structures are formed. And after flocking is completed, the magnetic particles in the hair follicle structures are magnetized, and then the work of preparing the hair follicle-imitating composite microstructure on the surface of the tool is completed. According to the prepared cutter surface hair follicle-imitating composite microstructure, the cutter can achieve the continuous wetting effect in the working process, the good wetting performance is achieved, and then the cutting performance of the cutter is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tool surface wetting, and in particular relates to a preparation method and device for a hair follicle-mimicking composite microstructure. Background Art

[0002] During the machining process of machine tools, there are problems such as large friction and wear of the tool and difficulty in lubrication and cooling. The above problems can be solved by improving the wetting performance of the tool. The existing method to improve the wetting performance of the tool is to open a microstructure on the surface of the tool, and improve the lubrication of the tool-chip contact area during tool machining by using the lubricating fluid stored in the microstructure to reduce tool wear and cutting temperature. However, the existing tool surface microstructure only uses a single physical property to wet the tool. For example, the patent with authorization announcement number CN110614388A discloses a gradient wetting tool and its preparation method and application, and the tool is wetted by setting a gradient lyophilic microtexture on the tool to achieve the effect of wetting the tool. The patent with authorization announcement number CN113579481A discloses a composite wetting tool and its preparation method, and a super-liquid-repellent layer is set on the front face of the tool, and a lyophilic microtexture is set on the super-liquid-repellent layer near the cutting edge. The cutting fluid is directionally transported to the tool-chip contact area, thereby achieving the effect of wetting the tool. The above patents cannot achieve continuous wetting, and the wetting effect is poor, which makes the tool cutting performance poor. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a method and device for preparing a composite microstructure imitating hair follicles.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a method for preparing a hair follicle-mimicking composite microstructure, which is specifically as follows:

[0006] Step 1: inject electrolyte into the liquid pool, fit the tool to the end of the positive wire of the power supply device, and clamp the tool with a workpiece clamping device; wherein a plurality of pits are processed on the surface of the tool.

[0007] Step 2: The translation mechanism 1 drives the translation mechanism 2 to drive the workpiece clamping device and the tool to translate, and the translation mechanism 2 drives the workpiece clamping device to translate the tool, so that a pit on the tool is located directly below the electrode, wherein the translation direction of the translation mechanism 1 is perpendicular to the translation direction of the translation mechanism 2; the lifting mechanism drives the motor, the chuck and the electrode to descend to a preset height, so that the deformation section of the electrode extends into the pit, wherein the deformation section of the electrode is made of memory alloy material; then a preset volume of electrolyte is sprayed from the nozzle on the vertical section and flows along the electrode into the pit; then the heating plate is heated, the deformation section is heated to become an arc shape, and the power supply device works, so that the electrode, the tool, the power supply device and the electrolyte in the pit form an electrochemical system; the motor drives the chuck to drive the electrode to rotate, and because the deformation section is in an arc shape at this time, the shape of the pit is etched into a follicle shape, forming a follicle structure; after the processing is completed, the power supply device stops working, the heating plate stops heating, and the motor stops driving the chuck. After the deformation section cools and returns to its original state, the lifting mechanism drives the motor, the chuck and the electrode to rise to the original position. In the process of lifting and rotating the electrode, the end of the negative wire of the power supply device is always in contact with the vertical section of the electrode.

[0008] Step 3: Repeat step 2 until all the pits are processed into hair follicle structures.

[0009] Step 4: Translation mechanism 1 drives translation mechanism 2 to translate, and translation mechanism 2 drives the workpiece clamping device to translate, so that the workpiece clamping device translates to its original position, the workpiece clamping device releases the tool, removes the tool, and ultrasonically cleans the tool. After cleaning, wipe the tool with anhydrous ethanol to dry the tool.

[0010] Step 5: Inject flocking glue doped with magnetic particles into each hair follicle structure of the tool, and then perform flocking in each hair follicle structure of the tool to implant fiber bundles.

[0011] Step 6: Place the flocked tool into a pulsed magnetic field to magnetize the magnetic particles in each hair follicle structure.

[0012] The preparation device used in the preparation method of the hair follicle imitating composite microstructure of the present invention comprises a bottom plate, a position adjustment device, a power supply device, an electrolysis device and a liquid pool.

[0013] The position adjustment device includes a translation mechanism 1, a translation mechanism 2 and a workpiece clamping device; the translation mechanism 1 is arranged on the base plate and drives the translation mechanism 2 to translate; the workpiece clamping device includes a workpiece base, a heating plate, a clamping block and a screw rod, the horizontally arranged workpiece base is driven to translate by the translation mechanism 2, and the translation direction of the translation mechanism 1 driving the translation mechanism 2 is perpendicular to the direction of the translation direction of the workpiece base driven by the translation mechanism 2, a groove is provided on the workpiece base, and an open groove is provided at one end of the groove, the horizontally arranged screw rod and the workpiece base form a rotating pair, the clamping block is aligned with the open groove, and forms a sliding pair parallel to the screw rod with the groove, and forms a threaded pair with the screw rod, and two parallel and symmetrically arranged heating plates are fixed on both sides of the clamping block in the groove; in the initial state, the clamping block is located at the end of the groove away from the open groove.

[0014] The electrolysis device includes a chuck, a lifting mechanism, an L-shaped plate, an electrode, a spray mechanism, a platform and a bracket; the bracket is fixed to the bottom plate, the lifting mechanism is arranged on the bracket, and drives the L-shaped plate to lift; the chuck and the L-shaped plate form a rotating pair, and are driven to rotate by a motor; the electrode is composed of an integrally formed vertical section and a deformation section, and the end of the vertical section away from the deformation section is fixed to the chuck, and the deformation section is made of memory alloy material; the spray mechanism is arranged on the bracket, and the spray head of the spray mechanism is close to the vertical section; the platform is fixed on the bracket, and a conduit is fixed on the platform. The power supply device is arranged on the bottom plate, and the positive electrode wire end of the power supply device is fixed to the open groove, and the negative electrode wire end passes through the conduit and fits with the vertical section. The liquid pool is fixed on the bottom plate, and the liquid outlet of the liquid pool is connected to the liquid inlet of the spray mechanism through the liquid outlet pipe.

[0015] Preferably, a knob is fixed on the screw rod.

[0016] Preferably, a vertically arranged glass cover is fixed on the L-shaped plate, and the clamp and part of the vertical section are located in the glass cover, and two slots arranged at intervals are also opened on the glass cover; the nozzle of the injection mechanism passes through one of the slots and is close to the vertical section, and the end of the negative electrode wire passes through the conduit and the other slot in sequence and fits with the vertical section; wherein the distance between the end of the negative electrode wire and the nozzle and the top of the corresponding slot is greater than the preset height.

[0017] Preferably, the groove is provided with a through hole, and the liquid inlet of the liquid pool is connected with the through hole through a liquid return pipe.

[0018] Preferably, the memory alloy tool is made of titanium-nickel-niobium shape memory alloy, and the titanium-nickel-niobium shape memory alloy is composed of 45% to 50% titanium, 40% to 45% nickel and 5% to 10% niobium in atomic percentage.

[0019] The present invention has the following beneficial effects:

[0020] 1. The composite microstructure imitating hair follicles on the surface of the tool prepared by the present invention enables the tool to achieve continuous wetting during operation, has good wetting properties, and thus improves the cutting performance of the tool. Specifically, the present invention utilizes the thermal deformation properties of the memory alloy material, and inserts the electrode deformation segment of the memory alloy material into the pit processed by laser on the surface of the tool, so that the deformation segment is heated to become an arc shape and rotates, and an electrochemical etching method is used to etch the pit into a follicle structure through the deformation segment, and then a flocking glue doped with magnetic particles is injected into each follicle structure, and a fiber bundle is implanted in each follicle structure. After the flocking is completed, the magnetic particles in each follicle structure are magnetized, thereby completing the preparation of the composite microstructure imitating hair follicles on the surface of the tool; wherein, when the tool is used, each fiber in each follicle structure absorbs the lubricating liquid coated on the surface of the tool by "capillary phenomenon", and stores the lubricating liquid in the corresponding In the follicle structure, when the tool is processing a workpiece, the top of each fiber in each follicle structure contacts the workpiece. As the friction proceeds, the lubricating fluid in each follicle structure flows toward the top of the fiber under the synergistic effect of capillary force and intermolecular force, thereby continuously lubricating the friction area, thereby improving the cutting performance of the tool. In addition, when the lubricating fluid used is a magnetic nanofluid, the magnetic field generated by the magnetic particles in each follicle structure helps the magnetic nanofluid to flow quickly to the follicle structure, thereby improving the lubrication effect. Moreover, since the follicle structure has the characteristics of being narrow at the top and wide at the bottom, the fibers in each follicle structure are not easily pulled out during the operation of the tool, thereby ensuring the stability of the continuous wetting and lubrication performance of the follicle-mimicking microstructure on the tool surface.

[0021] 2. The tool prepared by the present invention can achieve multi-level regulation of the wetting performance of the tool surface under the synergistic effect of texture-magnetic field-fiber; specifically, firstly, the follicle structure texture prepared on the tool surface changes the surface energy of the tool surface, so that the surface energy of the texture area is increased, and the magnetic nanofluid on the tool surface flows to the texture area driven by the high surface energy; secondly, after the magnetization treatment, the magnetic particles enhance the magnetic susceptibility of the tool and make the magnetic field on the tool unevenly distributed. Due to the tip effect of the magnetic field, the texture edge and sharp corners have a larger magnetic field strength, thereby allowing the magnetic nanofluid to flow rapidly into the texture under the attraction of the larger magnetic field strength; finally, there are a large number of pores between the fibers in the follicle structure texture, and these pores will produce capillary action on the liquid. The magnetic nanofluid spreads rapidly in the texture under the capillary action of the fibers in the texture, thereby enhancing the fluidity of the lubricating liquid in the contact area between the tool and the workpiece, providing favorable conditions for the continuous lubrication of the tool surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a preparation device for preparing a hair follicle structure in the present invention;

[0023] Figure 2 It is a structural schematic diagram of the position adjustment device in the present invention;

[0024] Figure 3 It is a schematic structural diagram of the workpiece clamping device in the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the electrolysis device in the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the electrode in the present invention;

[0027] Figure 6 It is a schematic diagram of the tool in the present invention when preparing a pit by laser;

[0028] Figure 7 is a simplified structural diagram of the electrochemical system of the present invention;

[0029] Figure 8 This is a schematic diagram of the principle of the tool in the present invention preparing the hair follicle structure through the electrochemical system;

[0030] Fig. 9 It is a schematic diagram of the structure of the hair follicle-mimicking composite microstructure on the surface of the tool in the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings.

[0032] like Figure 1 As shown, a preparation device for a hair follicle-mimicking composite microstructure of the present invention comprises a base plate 1, a position adjustment device 2, a power supply device 3, an electrolysis device 4 and a liquid pool 5.

[0033] like Figure 2 and Figure 3 As shown, the position adjustment device 2 includes a translation mechanism 1 2-1, a workpiece clamping device 2-2 and a translation mechanism 2-3; the translation mechanism 1 2-1 is arranged on the base plate 1, and drives the translation mechanism 2-3 to translate; the workpiece clamping device 2-2 includes a workpiece base 2-2-1, a heating plate 2-2-2, a clamping block and a screw rod, and the horizontally arranged workpiece base 2-2-1 is driven to translate by the translation mechanism 2-3, and the translation direction of the translation mechanism 1 2-1 driving the translation mechanism 2-3 is perpendicular to the translation direction of the translation mechanism 2-3 driving the workpiece In the direction of translation of the base 2-2-1, a groove is provided on the workpiece base 2-2-1, and an open groove 2-2-5 is provided at one end of the groove. The horizontally arranged screw rod and the workpiece base 2-2-1 form a rotating pair. The clamping block is aligned with the open groove 2-2-5 and forms a sliding pair parallel to the screw rod with the groove, and forms a threaded pair with the screw rod. Two parallel and symmetrically arranged heating plates 2-2-2 are fixed on both sides of the clamping block in the groove. In the initial state, the clamping block is located at one end of the groove away from the open groove 2-2-5.

[0034] like Figure 4 and Figure 5 As shown, the electrolysis device 4 includes a chuck 4-2, a lifting mechanism 4-4, an L-shaped plate 4-5, an electrode 4-6, an injection mechanism 4-7, a platform 4-8 and a bracket 4-9; the bracket 4-9 is fixed on the bottom plate 1, the lifting mechanism 4-4 is arranged on the bracket 4-9, and drives the L-shaped plate 4-5 to rise and fall; the chuck 4-2 and the L-shaped plate 4-5 form a rotating pair, and are driven to rotate by a motor 4-3, and the motor 4-3 is controlled by a controller; the electrode 4-6 is composed of an integrally formed vertical section 4-6-1 and a deformation section 4-6-2, and the end of the vertical section 4-6-1 away from the deformation section 4-6-2 is fixed to the chuck 4-2, and the deformation section 4-6-2 is made of memory alloy material; the injection mechanism 4-7 is arranged on the bracket 4-9, and the nozzle of the injection mechanism 4-7 is close to the vertical section 4-6-1; the platform 4-8 is fixed on the bracket 4-9, and a catheter is fixed on the platform 4-8. The power supply device 3 is arranged on the bottom plate 1, and the positive lead end of the power supply device 3 is fixed to the open groove 2-2-5, and the negative lead end passes through the conduit and fits with the vertical section 4-6-1. The liquid pool 5 is fixed on the bottom plate 1, and the liquid outlet of the liquid pool 5 is connected to the liquid inlet of the injection mechanism 4-7 through the liquid outlet pipe.

[0035] As a preferred embodiment, a knob 2-2-4 is fixed on the screw rod to facilitate the rotation of the screw rod.

[0036] As a preferred embodiment, a vertically arranged glass cover 4-1 is fixed on the L-shaped plate 4-5, and the clamp 4-2 and a part of the vertical section 4-6-1 are located in the glass cover 4-1, and two slots arranged at intervals are also opened on the glass cover 4-1; the nozzle of the injection mechanism 4-7 passes through one of the slots and is close to the vertical section 4-6-1, and the end of the negative electrode wire passes through the conduit and the other slot in turn and fits with the vertical section 4-6-1.

[0037] As a preferred embodiment, the groove is provided with a through hole, and the liquid inlet of the liquid pool 5 is connected with the through hole through a liquid return pipe, so that after the electrolyte falls into the groove, the electrolyte flows into the liquid pool 5 through the liquid return pipe.

[0038] As a preferred embodiment, the memory alloy material is titanium-nickel-niobium shape memory alloy, and the titanium-nickel-niobium shape memory alloy is composed of 45% to 50% titanium, 40% to 45% nickel and 5% to 10% niobium in atomic percentage.

[0039] The present invention provides a method for preparing a hair follicle-mimicking composite microstructure, which is specifically as follows:

[0040] Step 1, inject electrolyte into the liquid pool 5, place the tool 2-2-3 in the groove, and fit the tool with the positive wire end of the power supply device 3 fixed in the open groove 2-2-5, manually turn the knob 2-2-4 forward, and the knob 2-2-4 drives the clamping block to move toward the open groove 2-2-5 through the screw rod, so that the tool is clamped between the clamping block and the open groove 2-2-5; wherein, the surface of the tool is processed by laser processing technology with multiple pits arranged in a mesh, such as Figure 6 shown.

[0041] Step 2, the translation mechanism 1 2-1 drives the translation mechanism 2-3 to drive the workpiece clamping device 2-2 and the tool to translate, the translation mechanism 2-3 drives the workpiece clamping device 2-2 to drive the tool to translate, so that a pit on the tool is located directly below the electrode 4-6, and the lifting mechanism 4-4 drives the L-shaped plate 4-5 to drive the glass cover 4-1, the clamping head 4-2 and the electrode 4-6 to descend to a preset height, so that the deformed section 4-6-2 of the electrode 4-6 extends into the pit, wherein, at the initial position, the distance between the end of the negative electrode wire and the nozzle and the top of the corresponding notch is greater than the preset height, so the lifting of the glass cover 4-1 will not affect the nozzle and the negative electrode wire; then the injection mechanism 4-7 works, and the output The electrolyte in the liquid delivery pool 5 makes the preset volume of electrolyte sprayed from the nozzle on the vertical section 4-6-1 and flow into the pit along the electrode 4-6; then the two heating plates 2-2-2 are heated, and the deformation section 4-6-2 is heated (the electrolyte in the pit transfers the heat of the heating plate to the deformation section) and deforms into an arc shape, and the power supply device 3 works, so that the electrode 4-6, the tool 2-2-3, the power supply device 3 and the electrolyte in the pit form an electrochemical system, and the controller controls the motor 4-3 to drive the chuck 4-2 to drive the electrode 4-6 to rotate, and because the deformation section 4-6-2 is an arc shape, the shape of the pit is etched into a hair follicle shape, forming a hair follicle structure, such as Figure 7 and Figure 8 As shown; after the processing is completed, the power supply device 3 stops working, the two heating plates 2-2-2 stop heating, and the controller controls the motor 4-3 to stop driving the chuck 4-2. After the deformation section 4-6-2 cools and returns to its original state, the lifting mechanism 4-4 drives the L-shaped plate 4-5 to drive the chuck 4-2 and the electrode 4-6 to rise to their original positions. In the process of lifting and rotating the electrode 4-6, the negative electrode wire end of the power supply device 3 is always in contact with the vertical section 4-6-1 of the electrode 4-6.

[0042] Step 3: Repeat step 2 until all the pits are processed into hair follicle structures.

[0043] Step 4: The translation mechanism 1 2-1 drives the translation mechanism 2-3 to translate, and the translation mechanism 2-3 drives the workpiece clamping device 2-2 to translate, so that the workpiece clamping device 2-2 translates to its original position, and the knob 2-2-4 is manually reversed to move the clamping block away from the opening slot 2-2-5 to its original position; remove the tool, and put the tool into an ultrasonic cleaner for cleaning. After cleaning, wipe the tool with anhydrous ethanol to dry the tool.

[0044] Step 5: Place the tool on the processing table of the precision glue dispensing machine, and use the precision glue dispensing machine to inject flocking glue doped with magnetic particles into each hair follicle structure; then put the tool into the electrostatic flocking machine, and use the electrostatic flocking machine to flock each hair follicle structure to implant fiber bundles.

[0045] Step 6: Place the flocked tool into a pulsed magnetic field (a pulsed magnetic field device can be used to generate a pulsed magnetic field) to magnetize the magnetic particles in each hair follicle structure. After magnetization, take out the tool to complete the preparation of the hair follicle-like composite microstructure on the tool surface. Fig. 9 shown.

Claims

1. A method for preparing a hair follicle-mimicking composite microstructure, characterized in that: The details are as follows: Step 1: inject electrolyte into the liquid pool, fit the tool to the end of the positive lead of the power supply device, and clamp the tool with a workpiece clamping device; wherein a plurality of pits are processed on the surface of the tool; Step 2: The translation mechanism 1 drives the translation mechanism 2 to drive the workpiece clamping device and the tool to translate, and the translation mechanism 2 drives the workpiece clamping device to drive the tool to translate, so that a pit on the tool is located directly below the electrode, wherein the translation direction of the translation mechanism 1 is perpendicular to the translation direction of the translation mechanism 2; the lifting mechanism drives the motor, the chuck and the electrode to descend to a preset height, so that the deformation section of the electrode extends into the pit, wherein the deformation section of the electrode is made of memory alloy material; then a preset volume of electrolyte is sprayed from the nozzle on the vertical section and flows into the pit along the electrode; then the heating plate is heated, and the deformation section When heated, it becomes an arc shape, and the power supply device works, so that the electrode, the tool, the power supply device and the electrolyte in the pit form an electrochemical system; the motor drives the chuck to drive the electrode to rotate, and because the deformation section is in an arc shape at this time, the shape of the pit is etched into a hair follicle shape, forming a hair follicle structure; after the processing is completed, the power supply device stops working, the heating plate stops heating, and the motor stops driving the chuck. After the deformation section cools and returns to its original shape, the lifting mechanism drives the motor, the chuck and the electrode to rise to the original position; wherein, during the lifting and rotating process of the electrode, the end of the negative electrode wire of the power supply device is always in contact with the vertical section of the electrode; Step 3: Repeat step 2 until all the pits are processed into hair follicle structures; Step 4: The translation mechanism 1 drives the translation mechanism 2 to translate, and the translation mechanism 2 drives the workpiece clamping device to translate, so that the workpiece clamping device translates to the original position, the workpiece clamping device releases the tool, removes the tool, and ultrasonically cleans the tool. After the cleaning is completed, the tool is wiped with anhydrous ethanol to dry the tool; Step 5: Injecting flocking glue doped with magnetic particles into each follicle structure of the tool, and then flocking and implanting fiber bundles into each follicle structure of the tool; Step 6: Place the flocked tool into a pulsed magnetic field to magnetize the magnetic particles in each hair follicle structure.

2. The preparation device used in the preparation method of a hair follicle-mimicking composite microstructure according to claim 1 is characterized in that: It comprises a base plate, a position adjustment device, a power supply device, an electrolysis device and a liquid pool; the position adjustment device comprises a translation mechanism 1, a translation mechanism 2 and a workpiece clamping device; the translation mechanism 1 is arranged on the base plate, and drives the translation mechanism 2 to translate; the workpiece clamping device comprises a workpiece base, a heating plate, a clamping block and a screw rod, the horizontally arranged workpiece base is driven to translate by the translation mechanism 2, and the translation direction of the translation mechanism 1 driving the translation mechanism 2 to translate is perpendicular to the direction of the translation direction of the workpiece base driven by the translation mechanism 2 to translate, a groove is provided on the workpiece base, and an open groove is provided at one end of the groove, the horizontally arranged screw rod and the workpiece base form a rotating pair, the clamping block is aligned with the open groove, and forms a sliding pair parallel to the screw rod with the groove, and forms a threaded pair with the screw rod, and two parallel and symmetrically arranged heating plates are fixed on both sides of the clamping block in the groove; in the initial state, the clamping block is located at the end of the groove away from the open groove; The electrolysis device comprises a chuck, a lifting mechanism, an L-shaped plate, an electrode, a spraying mechanism, a platform and a bracket; the bracket is fixed on the bottom plate, the lifting mechanism is arranged on the bracket, and drives the L-shaped plate to lift and lower; the chuck and the L-shaped plate form a rotating pair, and are driven to rotate by a motor; the electrode is composed of an integrally formed vertical section and a deformation section, and the end of the vertical section away from the deformation section is fixed to the chuck, and the deformation section is made of memory alloy material; the spraying mechanism is arranged on the bracket, and the spray head of the spraying mechanism is close to the vertical section; the platform is fixed on the bracket, and a conduit is fixed on the platform; the power supply device is arranged on the bottom plate, and the positive electrode wire end of the power supply device is fixed to the open groove, and the negative electrode wire end passes through the conduit and fits with the vertical section; the liquid pool is fixed on the bottom plate, and the liquid outlet of the liquid pool is connected with the liquid inlet of the spraying mechanism through the liquid outlet pipe.

3. The preparation device used in the preparation method of a hair follicle-mimicking composite microstructure according to claim 2 is characterized in that: A knob is fixed on the screw rod.

4. The preparation device used in the preparation method of a hair follicle-mimicking composite microstructure according to claim 2, characterized in that: A vertically arranged glass cover is fixed on the L-shaped plate, and the clamp and part of the vertical section are located in the glass cover, and two slots arranged at intervals are also opened on the glass cover; the nozzle of the injection mechanism passes through one of the slots and is close to the vertical section, and the end of the negative electrode wire passes through the conduit and the other slot in sequence and fits with the vertical section; wherein the distance between the end of the negative electrode wire and the nozzle and the top of the corresponding slot is greater than the preset height.

5. The preparation device used in the preparation method of a hair follicle-mimicking composite microstructure according to claim 2, characterized in that: The groove is provided with a through hole, and the liquid inlet of the liquid pool is connected with the through hole through a liquid return pipe.

6. The preparation device used in the preparation method of a hair follicle-mimicking composite microstructure according to claim 2, characterized in that: The memory alloy tool is made of titanium-nickel-niobium shape memory alloy, and the titanium-nickel-niobium shape memory alloy is composed of 45% to 50% titanium, 40% to 45% nickel and 5% to 10% niobium in atomic percentage.

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